380kV CT-VT calculation_C4_Rev_D 17.12.09

‫فرع المنطقة الشرقية‬

380kV CT/VT SIZING CALCULATION (CROSS BAY C#4)

17.12.2009 D

REVISIONS DRAWN RJP

BY:DATE:-

20.12.08

CHECKED BY:-

JA

DATE:-

22.12.08

OPRG. DEPT BY DATE:-

ENG'G. DEPT. BY:DATE:-

CERTIFIED. BY:DATE:THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OF FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED

AS BUILT BY

DATE DRAWING TITLE

INDEX

380kV CT SIZING CALCULATION ABU-HADRIYAH 380/115kV BSP KHURSANIYAH

A

PLANT

T201

SAUDI ARABIA JOB ORDER NO.

DRAWING NO.

SHEET NO.

REV NO.

EE-086959

01 OF 50

D

3-083300.01 DWG.CONT.SHT.

EE-086950

SEC-ERB CAD-E (2002/03)

DMS

EXCEL

THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.

RJP

JA

RJP

REVISED AS PER SEC COMMENTS DATED 06.12.2009 ON REVISED CT CALCULATION.

25.06.2009 C

PG

‫الشركة السعودية للكهرباء‬

Eastern Region Branch

URD

REVISED AS PER SEC COMMENTS DATED 03.06.2009 ON REVISED CT CALCULATION.

JA

CERT'D

RJP

JA

APPR'D CHK'D DESCRIPTION

REVISED AS PER BASE DESIGN REVIEW MEETING DATED 16.03.09 & 17.03.09

BY

PG

DATE

03.04.2009 B

NO.

Saudi Electricity Company

PROJECT:

DOCUMENT TITLE:

ABU-HADRIYAH 380/115 kV BSP

DOCUMENT NUMBER:

380 kV CT/VT SIZING CALCULATION

EA-086959

INDEX SR. NO.

DESCRIPTION

SHEET NO.

1.0

GENERAL DESIGN CRITERIA FOR CT CALCULATION

1

1.1

SYSTEM DESIGN DATA

1

1.2 1.3 1.3

DESIGN BASIS AND REFERENCES FOR CT CALCULATION

1

CT LEAD RESISTANCE CALCULATION

2

2.0

CT CALCULATION FOR THE FOLLOWING CT's.

3

2.1

CT: 810 B1.C1 :- BF PROTECTION (RAICA)

3

2.2

CT: 810 B1.C2 :- OHL FEEDER SET-1 PROTECTION (REL 531)

5

2.3

CT: 810 B1.C3 :- OHL FEEDER SET-2 PROTECTION (7SA522)

12 16

2.4

CT: 810 B1.C4 :- METERING

14

2.5

CT: 810 F.C3 :- SPARE

15

2.6

CT: 810 F.C2 :- BUS-BAR PROTECTION MAIN-2 (MFAC14)

16

2.7

CT: 810 F.C1 :- BUS-BAR PROTECTION MAIN-1 (MCAG 14)

20

2.8

CT: 811 B1.C1 :- BF PROTECTION (RAICA)

24

2.9

CT: 811 B1.C2 :- OHL FEEDER SET-1 PROTECTION (RED 670)

25

2.10

CT: 811 B1.C3 :- OHL FEEDER SET-2 PROTECTION (MiCOM P546)

31

2.11


34

2.12


35

2.13


35

2.14

CT: 811 B2.C2 :-OHL FEEDER SET-1 PROTECTION (REL 531)

36

2.15

CT: 811 B2.C1 :- SPARE

36

2.16

CT: 812 F.C1 :- BUS-BAR PROTECTION MAIN-1 (MCAG 14)

37

2.17

CT: 812 F.C2 :- BUS-BAR PROTECTION MAIN-2 (MFAC14)

38

2.18

CT: 812 F.C3 :- SPARE

39

2.19


40

2.20


40

2.21

CT: 812 B2.C2 :- OHL FEEDER SET-1 PROTECTION (REL 531)

41

2.22

CT: 812 B2.C1 :- BF PROTECTION

41

BAY NUMBER: CROSS BAY C4

ABU-HADRIYAH CONTRACT No. 3-083300.01

PROJECT:

DOCUMENT TITLE:

ABU-HADRIYAH 380/115 kV BSP 3.00

DOCUMENT NUMBER:


EA-086959

LINE VT SIZING CALCULATION

42

BUS-1 VT SIZING CALCULATION

47

BUS-2 VT SIZING CALCULATION

49

ATTACHMENTS: ANNEXURE-1 CT REQUIREMENT OF RELAY ANNEXURE-2 VA REQUIREMENT OF RELAY ANNEXURE-3 SAUDI CABLE CATALOGUE ANNEXURE-4 380kV GIS CT DATA FROM AREVA ANNEXURE-4A 380kV GIS DATA SCHEDULE FROM AREVA ANNEXURE-5 MANIFA SUBSTATION ELECTRICAL LAYOUT ANNEXURE-6 380kV RELAYING & METERING ONE LINE DIAGRAM ANNEXURE-7 LINE PARAMETER ANNEXURE-8 380kV CVT DATA SCHEDULE ANNEXURE-9 M&I METROSIL CATALOGUE

BAY NUMBER: CROSS BAY C4


PROJECT: ABU-HADRIYAH 380/115 kV BSP

DOCUMENT TITLE:

DOCUMENT NUMBER:


EA-086959

1.0 GENERAL DESIGN CRITERIA FOR CT SIZING CALCULATION 1.1 System Design Data: 1.1.1 System Voltage in kV

380kV

1.1.2 380kV system X/R Ratio

> 17

(As per 32-TMSS-02, sh. No. 31 of 53, Annexure-4A)

1.1.3 380kV Maximum 3 pahse fault level

63000

Amps

1.1.4 380kV Maximum P-E fault level

63000 :

Amps

1.1.5 Design Fault level (CB Interr. capacity)

63kA

(As per 32-TMSS-02, sh. No. 31 of 53, Annexure-4A)

1.2 DESIGN BASIS AND REFERENCES FOR CT CALCULATION : 1.2.1 CT secondary excitation limiting emf and other parameters of CT's are calculated at adopted tap setting, as shown in relaying & metering one line diagram. 1.2.2 Lead length considered is 500 meters including safety margin. Refer to the attached Abuhadriyah substation electrical layout (dwg. No. EA-009912). Refer Annexure 5 sheet 2. Thus we have ensured that assumed 500m length is not exceeded by any actual length. 500m is also used as basis for any future modifications for normal S/S life time of 35years. 1.2.3 Safety margin of 20% is considered for protection class CT and 25% for metering class CT in the formulae for CT calculation as a general and where-ever applicable relay manufacturer's recommendation is followed. 1.2.4 CT specification is considered as per PTS 07EN307 part'F', Appendix-VII and GIS vendor data. 1.2.5 Zs (source Impedance) is calculated based on CB Interrupting capacity. The Line Impedance value will be added to Zs to derive the fault current (PF & EF) at zone1 end for CT excitation limiting EMF calculation. Only one way is considered for PF zone1 Ual calculation and 2 way CT lead length is considered for EF zone1 Ual calculation. CT Calculation for close in fault is done for 3 phase fault level 63kA. We also have assumed 3km long line in view of any future modifications in the 380kV system, 1.2.6 Annexure-1: CT requirement of relay Annexure-2: VA burden requirement of relay Annexure-3: Saudi cable catalogue for CT lead resistance calculation Annexure-4: CT data from 380kV GIS vendor (TOSHIBA) Annexure-4A: Data Schedule for 380kV GIS Annexure-5: Abu-hadriyah substation electrical Layout drawing for CT/VT cable route length (dwg. No. EA-009912) Annexure-6: 380kV Relaying & Metering one line diagram for cross bay C4. Annexure-7: Line parameters Annexure-8: 380kV GIS Data schedule-CCVT Annexure-9: M&I Metrosil catalogue

BAY NUMBER:

Sheet No.

CROSS BAY C4

1 of 50


PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

1.3 CT LEAD RESISTANCE CALCULATION : CT secondary lead size considered is 6 sq.mm. 0

0

6 sq.mm copper cable resistance at 20 C is 3.08 ohms/km.i.e Rdc at 20 C = 3.08 ohm/km (Refer Annexure-3) Rdc at 75ºC = R20(1+α20(T2-T1)); α at 20ºC = 0.004,Where α= temperature co-efficient of resistance. Hence, Rdc at 75ºC = 3.08(1+0.004(75-20)); =

3.76

ohm/km

Consider a distance from 380kV GIS CT to relay panel as per layout attached with considerable (Refer Annexure-5) safe margin = 500 meter, Lead resistance calculated is, =

3.76 x 0.5

=

1.88

ohms for 500 meters

BAY NUMBER:

Sheet No.

CROSS BAY C4

2 of 50


PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

2.0 CT CALCULATION AS PER RELAY/INSTRUMENT MANUFACTURER'S RECOMMENDATION 2.1 CT: 810 B1.C1

Protection

:

BF protection (50BF)

Core

:

CT: 810 B1.C1

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS

CT Secondary resistance at 75º C, RCT ohms

<

3.1 Ohms at 2000A tap.

Knee point voltage, Vk

Vk >

3700 V at 2000A tap

CT excitation current at 2000A tap in mA

Ie <

75

Thermal rating factor

200%

Application : CB Fail Protection (50BF) Relay Type / Make: "RAICA", ABB,(50BF)

CT CALCULATION: 2.1.1 CT Vk requirement: For

2000

A

=

2000

amps

Turn ratio

=

1/2000

Is =

Nominal ( rated) CT secondary Current

=

1

amps

IF

Maximum short circuit current

=

63000

amps

IF sec =

CT Secondary short circuit current in Amps.

=

31.5

amps

RCT =

Internal CT secondary resistance

=

3.1

ohms

RL =

Lead Resistance =2 L x Rpkm / 1000

=

1.88

ohms

RL =

Lead resistance of cable.

=

1.88

Ohms

RL =

1.88

ohms.

=

0.15

VA

=

0.15

ohms

Vk

Knee point voltage

IP T

= Nominal ( rated) CT primary Current =

=

=For 6 sq.mm copper cable, RL= 0.00308 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)) Consider length of cable = 500 meters. RRAICA= RRAICA=

Relay Burden (Refer Annexure-2, Sh. No. 6) Relay resistance = RB / Is

2

=

2

(0.15/1 )

BAY NUMBER:

Sheet No.

CROSS BAY C4

3 of 50


PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

Note: Maximum Relay burdens occur for 1ph-G fault when both phase & ground BFP O/C relay units are in series. 2x BFP Relay Fault Detectors = Total=

0.30

Ohms

0.30

ohms

Ground o/c relay

0.15

ohms

phase o/c relay

[1ph-G loop] [3ph]

BFP fault detectors come once main protection operates & initiate BFP. Worst case relay operation (fatest) is ½ cycle & hence @ maximum peak during fully offset. CT Requirement considering 20% margin.

General formulae: Vkrequired > 1.2xOffset for DC x Ifsecondaryx (Connected burden)

Vkrequired > 1.2x2xIf x ( RCT + 2RL + 2x(RRAICA )) > 1.2x2x31.5 x ( 3.1 + 3.76 + 2x(0.15)) > 541.296

Volts

Since CT rated knee point voltage is 3700V which is greater than 541.3 volts, CT is adequate.

BAY NUMBER:

Sheet No.

CROSS BAY C4

4 of 50


PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

2.2 CT: 810 B1.C2

Protection

:

OHL feeder protection Set-1 (87L-1,21-1)

Core

:

CT: 810 B1.C2

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS


<



Vk >

3700 V at 2000A tap


Ie <

75


200%

Application : OHL feeder protection Set-1 (87L-1,21-1) Relay Type / Make: "REL 531", ABB

2.2.1 Line Data: (Refer Annexure-7 attached) Line length as per annexure attached =

44.485

km

(Annexure-7)

Line parameter for Abu-hadriyah Al-fadhili line. Refer Annexure-7 for Line parameters. Z1 =

0.00054+j 0.0098 p.u

Base MVA = 100

Z0 =

0.00645+j 0.03112 p.u

Base kV = 380 2

Base Impedance calculated = (BasekV )

= 1444

ohms

= 151.9

amps

Base MVA Base Current calculated = (Base MVA) √3 x Base kV

Zline in ohms calculated; (Base Impedance x p.u Impedance)

R1=

0.794 ohms

X1=

14.15 ohms

R0=

9.314 ohms

X0=

44.94 ohms

X/R =

17

sin(tan-1(X/R)) =

0.998

cos(tan-1(X/R)) =

0.059

BAY NUMBER:

Sheet No.

CROSS BAY C4

5 of 50

Phase volt.= 219393.1

Volts

Phase Curr.= 63000

Amperes


PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

2.2.2 Source impedance: Xs = (Ph vol/Ph cu)xsin(tan-1(X/R))

Rs = (Ph vol/Ph cu)xcos(tan-1(X/R))

= 380000 x sin(tan-1(X/R))

= 380000 x cos(tan-1(X/R))

Sqrt.(3)x63000 = Zs=

3.48

Sqrt.(3)x63000

ohms

0.2 + j 3.48

=

0.20

ohms

ohms

2.2.3 Line impedance: X1 full Line: Line length x Reactance value/km =

14.1512

X0 full Line: Line length x Reactance value/km

ohms

=

R1 full Line: Line length x Resistance value/km

Z1 line

=

0.7942

ohms

=

0.7942 + j 14.15

ohms

44.93728

ohms

R0 full Line: Line length x Resistance value/km =

9.3138

Z0 line = 9.3 + j 44.94

ohms ohms

2.2.4 THREE PHASE FAULT CONDITION Close in Fault Fault current =

63

X/R =

17

kA

Source Imp. Z1=Z2=Z0 0.2 = + j 3.48

ohms

Through fault current at the end of the line: For 44.485 Km line Impedance calculated : (Rs + R1) + j(Xs+X1) (Positive sequence)

= (0.2+0.794) + j (3.48+14.15) = 0.994+j17.63

ZT1 = 17.66 Phase fault current =

ohms ohms

Ph. Volt / Ph. Imp. =

380000 Sqrt.(3)x17.63

= 12424.57 Phase fault X/R

=

Amps

17.63 0.994

=

17.74

BAY NUMBER:

Sheet No.

CROSS BAY C4

6 of 50


PROJECT:

DOCUMENT TITLE:



DOCUMENT NUMBER: EA-086959

Fault current calculation at the end of zone1 fault i.e 80% of line length: For 44.485 Km line Impedance calculated : (Rs+0.8R1) + j(Xs+0.8X1) (Positive sequence)

= (0.2+0.635) + j (3.48+11.32) = 0.84+j14.8


ohms


380000 Sqrt.(3)x14.82


=

Amps

14.82 0.835

= 17.75

2.2.5 SINGLE PHASE-GROUND FAULT CONDITION: Through fault current at the end of the line: For 44.485 Km line Impedance calculated : (3Rs+2R1+R0) + (Loop Impedance)

j(3Xs+2X1+X0) = 11.5+j83.79

ZT1 = 84.39 Earth fault current =

ohms ohms


380000 Sqrt.(3)x84.39

I0 Earth fault X/R

= 2599.62 =

Amps

83.79 11.5

3I0

=

7.29

=

7798.87

Amps

BAY NUMBER:

Sheet No.

CROSS BAY C4

7 of 50


PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

Fault current calculation at the end of zone1 fault i.e 80% of line length: For 44.485 Km line Impedance calculated : (3Rs+0.8x2R1+R0) + (Loop Impedance)

j(3Xs+0.8x2X1+X0) = 9.32+j69.12


ohms ohms


380000 Sqrt.(3)x69.75

= 3145.62 Earth fault X/R

=

Amps

69.12 9.32

3I0=

=

7.42

=

9436.869326

Amps

2.2.6 CT Requirement : ( As per Annexure-1, Sh. No.20,21)

Eal Eal Eal Eal

> Ealreq > Ealreq > Ealreq > Ealreq

= {I kmax x I sn} / Ipn x 0.5 x (RCT + RL + SR / Ir

2

Equation-1

)

2

Equation-2

= 2 x {Ikmax x I sn} / Ipn x (RCT + RL + SR / Ir ) 2

Equation-3

= 0.12 x f x Isn x(RCT + RL + SR / Ir ) = (Imin sat x CT factor x Ir) / 100 x (RCT + RL + SR / Ir

2

Equation-4

)

Where, Ikmax =

Maximum Primary fundamental frequency fault current for internal close-in faults (A)

Itfdb =

Maximum Primary fundamental frequency fault current for external faults (A) that passes through two CT's (A). Here for one and half breaker scheme Ikmax is equal to Itfdb.

Ipn =

The rated primary CT current (A)

Isn =

The rated secondary CT current (A)

Ir =

The rated current of the protection IED (A)

SR =

The burden of IED 670 a current input channel (VA). SR = 0.25 VA/channel.

f=

system frequeny in Hz.

Imin sat= Saturation detector min current ( 100 - 1000% Of Ir) and set at 500% CT factor = set current scalling factor (0.4 - 1.0)

Where,

For

Ealreq=

Required secondary e.m.f.

Eal =

Rated equivalent secondary e.m.f.= Vk

I K max =

Maximum short circuit current-Three phase

2000

amps

=

3700

volts

=

63000

amps

BAY NUMBER:

Sheet No.

CROSS BAY C4

8 of 50


PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

Itfdb =

Maximum Primary fault current for external faults (A)

=

63000

amps

I pn =

Nominal ( rated) CT primary Current

=

2000

amps

I sn =


=

1

amps

RCT =

CT secondary winding resistance

=

3.1

ohms

RB

=

Burden of relay

=

0.25

ohms

RL

=

Lead resistance of cable. =For 6 sq.mm copper cable, RL= 3.08 ohm/kmeter at 20ºC.

Ir f

= =

α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1))

RL

1.88

Consider length of cable = 500 meters.

2RL =

3.76

ohms

Protection terminal rated Current

=

1

amps

System Frequency

=

60

Hz

=

17

.= ( 17 / 2x 3.14x 60) x 1000

=

45.09

msec

Burden value for TFR (Refer Annexure-2,Sh. No.7)

=

0.01

VA

=

0.26

VA

Imin Sat=

Sat saturation detector min current

X/R =

System ratio

Tp

Primary time constant, (L/R)

=

L/R = (X/(2x 3.14x f )/R

RTFR =

Hence, total VA burden including TFR.

Voltage developed across CT as per ABB relay catalogue. At 2000/1 A tap Considering 20% margin

Eal

> Ealreq = {I kmax x I sn} / Ipn x 0.5 x (RCT + RL + SR / Ir

2

Equation-1

)

As per REL 531 relay requirement, the factor 0.5( for Tc less than 120ms) is replaced with 0.53 & 0.54 for primary time constant of 200ms and 300ms respectively.

Ealreq = 63000 x 1 x 0.5 x ( 3.1+ 1.88 + 0.27/1^2 )

=

82.5

volts

=

99.0

volts

2000 With 20% extra margin Ealreq

BAY NUMBER:

Sheet No.

CROSS BAY C4

9 of 50


PROJECT:

DOCUMENT TITLE:


Eal

DOCUMENT NUMBER:


> Ealreq = 2 x {Ikmax x I sn} / Ipn x (RCT + RL + SR / Ir

2

EA-086959

Equation-2

)

As per REL 531 relay requirement, the factor 2 ( for Tc less than 120ms) is replaced with 2.32 & 2.5 for primary time constant of 200ms and 300ms respectively.

Ealreq = 63000 x 1 x 2 x ( 3.1+ 1.88 + 0.27/1^2 )

=

330.1

volts

=

396.1

volts


Eal

> Ealreq = 0.12 x f x Isn x (RCT + RL + SR / Ir

2

Equation-3

)

2

Ealreq = 0.12 x 50 x 1x(3.1+ 1.88 +0.27/1 )

=

31.4

volts

With 20% extra margin Ealreq

=

37.7

volts

Eal

> Ealreq

= (Imin sat x CT factor x Ir) / 100 x (RCT + RL + SR / Ir 2 )

2

Ealreq = 500 x 1 x 1x(3.1+ 1.88 +0.27/1 )

Equation-4

=

26.2

volts

=

31.4

volts


Since CT rated knee point voltage is 3700V which is greater than the required value, the proposed CT is adequate.

The Voltage developed across the CT secondary for distance protection (21L) feature as per ABB catalogue. (Refer Annexure-1 Sh. No. 22 ) Requirement -1 At 2000/1 A tap Eal

> Ealreq = {I kmax x I sn} / Ipn x a x (RCT + RL + SR / Ir 2 )

Equation-5

a' = 2 for primary time constant less than 50msec. With 20% extra margin Ealreq = 63000 x 1.2 x 2 x ( 3.1+ 1.88 + 0.27/1^2 )

=

538.3

volts

2000

BAY NUMBER:

Sheet No.

ABU-HADRIYAH CONTRACT No.

CROSS BAY C4

10 of 50

3-083300.01

PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

Requirement -2 Eal

> Ealreq = Ikzone1x 7 x (Isn / Ipn) x (RCT + RL + SR / Ir

2

Equation-6

)

k' = 7 for primary time constant greater than 30 msec. Ikzone1= Maximum primary fundamental fault current at the end of zone 1 reach. Considering 80% of actual line length

=

14800.04 Amps

(Refer above fault current calculation at the end of zone1 reach considering actual line length) At 2000/1 A tap and with 20% extra margin 2

=

Ealreq = 14800 x 1.2 x 7 x ( 3.1+ 1.88 +0.27/1 )

442.58038 volts

2000 Since CT rated knee point voltage is 3700V which is greater than the required value, the proposed CT is adequate.

BAY NUMBER:

Sheet No.


CROSS BAY C4

11 of 50

3-083300.01

PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

2.3 CT: 810 B1.C3

Protection

:

OHL feeder protn. -Set-2 (87L-2,21-2)

Core

:

CT: 810 B1.C3

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS


<



Vk >

3700 V at 2000A tap


Ie <

75


200%

Application : OHL feeder protection - Set-2 (87L-2,21-2) Relay Type/make : ''7SA522 ", Siemens.

2.3.1 CT Calculation Where

For

Vk =

Knee point voltage of CT

RB =

Resistance of relay 7SA522

Rr =

Relay resistance

RCT =


RL =


2000

amps

3700

Volts

=

0.05

ohms

=

3.1

ohms

For 6 sq.mm copper cable, RL= 3.08 ohm/kmeter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1))

RL =

1.88

ohms


2RL=

3.76

ohms

IP =


=

2000

amps

IS =


=

1

amps

ISCC max = Maximum short circuit current-Three phase

=

63000

amps

VK

CT knee point voltage specified

=

3700

volts

X/R =

System ratio

=

17

If

Maximum value of through fault current for =

31.50

( I f )x( X/R) =

535.5

=

stability ( multiple of Is) = I

Tp

=

SCC max

/ IP

Primary time constant, (L/R) L/R = (X/(2x 3.14x f )/R .= ( 17 / 2x 3.14x 60) x 1000

=

45.09

msec

BAY NUMBER:

Sheet No.


CROSS BAY C4

12 of 50

3-083300.01

PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

The CT should meet the following Vk requirement as per Siemens publication. ( Refer Annexure-1 Sh. No. 24 )

Vk 1

>

{Ktd(a)xIssc max(close-in fault)/1.3xIpn} x Isn x (RB + RCT +RL)

For close-in fault

Vk 2

>

{Ktd(b)xIssc max(zone-1 end fault)/1.3xIpn} x Isn x (RB + RCT +RL)

For zone-1 end fault

Ktd(a) = 2' for primary time constants less than 50ms Ktd(b) = 5' for primary time constants less than 50ms Vk1 =

Accuracy limiting voltage for close in fault in volts

Vk2 =

Accuracy limiting voltage for end of zone 1 line fault in volts

IFZ1 =

Maximum secondary fault current for end of zone 1 fault in amps. Considering actual line length as a worst case, primary fault current (A) calculated is equal 14800.04 Amps. Hence, CT secondary fault current =

14800.04 2000 =

RB

=

7.40

Amps.

Relay burden

CT requirement for close-in fault condition: Vk 1

>

{Ktd(a)xIssc max(close-in fault)/1.3xIpn} x Isn x (RB + RCT +RL)

= {2 x 63000/1.3x2000} x (0.05 + 3.1 + 1.88)

=

244

volts

Vk 2 with 20 % margin

=

293

volts

Peak voltage

=

413.7

Vpeak

CT requirement for zone1 fault condition: Vk 2

>

{Ktd(b)xIssc max(zone-1 end fault)/1.3xIpn} x Isn x (RB + RCT +RL)

= {5 x 14800/1.3x2000} x (0.05 + 3.1 + 1.88)

=

143

volts


=

172

volts

Peak voltage

=

243.0

Vpeak


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DOCUMENT TITLE:

DOCUMENT NUMBER:


EA-086959

2.4 CT: 810 B1.C4

Protection

:

Metering

Core

:

CT: 810 B1.C4

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

0.2

VA Burden

50

VA


200%

Application : Metering Burden Calculation (Refer Annexure-2) a

LCP Ammeter

b

0.5 VA

Revenue metering panel ABB, ALPHA A3R

c

d

(Assumed)

1E-04 VA

( Refer Annexure-1 Sh. No. 18 )

Watt transducer, , AREVA, ISTAT300

1 VA


Var transducer, AREVA, ISTAT300

1 VA


Mosaic panel

Watt meter, PML ION6200

0.5 VA

(Assumed)

Var meter PML ION6200

0.5 VA

(Assumed)

DSM

0.1 VA

(Assumed)

Cabling loop (500 meters) For 4 sq.mm copper cable, RL= 0.00461 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)); Consider length of wire = 500 meters.

RL

=

2.812 Ohms

2RL

=

5.624 VA

Total connected burden, PBC =

9.224 VA

Considering 25% safe margin, connected VA equals to=

11.53 VA

CT Rated burden = 50VA

The total connected burden is less than the CT rated burden i.e 50VA. Hence the CT is adequate.

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DOCUMENT TITLE:

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EA-086959

2.5 CT: 810 F.C3

Protection

:

Spare

Core

:

CT: 810 F.C3

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS


<



Vk >

5550 V at 3000A tap


Ie <

50


200%

Application : Spare

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PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

2.6 CT: 810 F.C2

Protection

:

Bus-bar protection (87M2)

Core

:

CT: 810 F.C2

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS

CT Secondary resistance at 75º C, RCT ohms <



Vk >

5550 V at 3000A tap


Ie <

50


200%

NOTE: Typical bus-bar protection CT's core detail for adjacent cross bay's(3 nos. including future bays) are shown below.

Protection

:


Core

:

Core 2

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS




Vk >

5550 V at 3000A tap


Ie <

50


200%

Application : Bus-Bar Protection-Main-2 (87M2) Relay Type / Make: "MFAC14", AREVA (Setting range: 25V-325V)

2.6.1 CT Calculation The setting voltage is determined by the following relationship. (Refer Annexure-1, Sh. No.11) 1.2 x If x ( RCT + 2 x RL )

Vs >

(20% additional margin is taken)

Where IP

=

For

3000


3000

amps

1

amps

63000

amps

IS

=


IF

=

Maximum Fault Current

=

CT secondary fault current

=

21

amps

4.65

ohms

If

=

RCT =

Internal CT secondary resistance

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RL =

DOCUMENT NUMBER:



EA-086959

=

1.88

Ohms

RL =

1.88

ohms.

=

5550

Volts

=For 6 sq.mm copper cable, RL= 0.00308 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)) Consider length of cable = 500 meters. Vk =

Specified knee point voltage

Calculation of relay setting voltage: Vs >

1.2 x If x ( RCT + 2 x RL )

Vs >

1.2 x 21 x (4.65 + 3.76 )

Vs >

211.932

Hence select Vs

=

275

Vrms

Peak voltage

=

388.91

Vpeak

Hence, select a metrosil with setting range 25V- 325V and set at 275 volts.

2.6.2 Metrosil requirement For this relay Metrosil proposed by the manufacturer has the following parameters. C

=

900

β

=

0.25

The current drawn by metrosil at relay setting voltage is given by formulae below. Irms drawn= where

0.52((√2xV')/C))1/β V' = voltage in (RMS Sine)

Metrosil recommended for 25-325V relay range @ 2kVrms Irms drawn= =

0.52x((√2x2000)/900)1/0.25 50.72

A rms

At voltage setting Vs = 275V, Metrosil draws about 18mA

%Error

=

(0.018 / Ifs ) x 100

=

(0.018 / 21 ) x 100

=

0.086%

Error introduce by metrosil at voltage setting Vs = 275V is 0.086% only.

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Metrosil selection:

DOCUMENT NUMBER:


EA-086959

(Refer Annexure-8)

To limit voltage to 2kVrms, select metrosil same as recommended by MFAC 14 for Vs = 275V C

=

900

β

=

0.25

As per M&I materials catalogue attached, for the above 'C' and 'β' characteristics, the recommended metrosil type is 600A/S1/S1088. We recommend standard metrosil as per AREVA recommandation only as the relay & scheme is by AREVA. CT secondary fault current calculated as above =

21

Amps.

Hence, Metrosil withstanding capability is greater than CT secondary current.

2.6.3 Determination of primary fault current setting: At 3000/1 A tap Taking Primary fault currrent setting as 1% of maximum fault current i.e 63000 Amps. 1% of bus-bar fault current

=

630

amps

Primary Fault current setting Calculation The primary operating current or fault setting calculated as Ip=

{ n Im+ Ir +IM+IV}xT

Ip

=

Primary fault setting

n

=

number of CTs in parallel including 3 future bays

Im

=

exciting current of each CT at the relay circuit setting voltage

=

8.0 0.005

Amps

90000.0

ohms

Current in MVTP11 relay, (Vs/RMVTP31)

0.003

Amps

current in metrosil at the relay circuit setting voltage

0.018

Amps

0.03

Amps

RMVTP31 =

Resistance of CT supervision relay MVTP 31(Assumed)

IV IM

= =

Ir = Relay operating current as per MFAC manual for setting range 25-325V Where relay setting voltage is low then current in non linear resistor is ignored. Primary fault setting (Ip) =

{n Im+ Ir +IM+IV}xT =

273.167

This current is too small as compared to 63kA i.e 0.43% of 63kA. It is observed that the primary operating current is less than 630A. Hence, an external shunt resistor (Rsh) needs to be connected inorder to get a primary operating current 630A.

Select shunt resistor to get primary operating current of say 742 Amps. Ip =

{ nIe+ Ir +IM+(Vs/Rsh)+IV}xT

742 =

{8x0.005+0.03+0.018+(275/Rsh)+0.003} x3000

0.156

The value of external shunt resistor required is calculated as

Rsh =

1759.7

ohms

As per AREVA MCAG14 catalogue attached Annexure-2 sheet no. 4 Select a resistor 2700 ohms and set at 1760 ohms with the short time current rating (1 seconds) of 1.3 Amps.

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2.6.4 Shunt resistor Wattage calculation: Current in shunt resistor at setting voltage Vs =275 Volts;= 275 Shunt resistor Wattage = 0.16x0.16x1760 45.06

Watts.

=

0.16

Amps.

1759.7

Watts.

Hence, select a shunt resistor of 50 watts. Hence, Primary operating current calculated = Primary fault setting (Ip) =

{n Im+ Ir +IM+IV+IRsh}T =

742.0

Amps.

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DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

2.7 CT: 810 F.C1

Protection

:


Core

:

CT: 810 F.C1

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS




5550 V at 3000A tap

Vk >

CT excitation current at 3000A tap in mA Iex <

50


200%


Protection

:


Core

:

Core 1

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS

CT Secondary resistance at 75º C, RCT ohms < Knee point voltage, Vk CT excitation current at 3000A tap in mA

4.65 Ohms at 3000A tap. Vk >

Ie <


5550 V at 3000A tap 50 200%

Application : Bus-Bar Protection-Main-1 (87M1) Relay Type / Make: "MCAG 14", AREVA (Setting range: 20%-80% of 1A)

2.7.1 CT Requirement Where

For Knee point voltage

Vk Vs

=

3000

A

5550

volts

amps

Setting Voltage

IP

= Nominal ( rated) CT primary Current

=

3000

T

= Turn ratio

=

1/3000

Is

= Nominal ( rated) CT secondary Current

=

1

amps

Maximum short circuit current

=

63000

amps

CT secondary fault current in amps.

=

21

amps

IF If

= =

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DOCUMENT TITLE:


RCT

DOCUMENT NUMBER:


= Internal CT secondary resistance

EA-086959

=

4.65

ohms

=

1.88

Ohms

RL =

1.88

ohms.

RB-MCAG =Relay Burden

=

1.00

VA

RRMCAG = Relay resistance = RB / Is 2

=

1.00

ohms

RL

= Lead resistance of cable. =For 6 sq.mm copper cable, RL= 0.00308 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)) Consider length of cable = 500 meters.

The setting voltage Vs shall be calculated in order to ensure the stability of the protection in regard with the maximum through fault current If . The setting voltage is determined by the following eqn. Vs >

1.2 x If x ( RCT + 2 x RL )

Vs >

1.2 x 21 x (4.65 + 3.76 )

Vs >

211.932

(Refer Annexure-1, Sh.No.8)

Hence, select Vs same as Main-2 protection = Peak voltage

=

275

Vrms

388.91

Vpeak

2.7.2 Voltage Llimiting Resistor- Metrosiles: (Refer MCAG 14 sheet attached) To establish the requirement for a Metrosil the peak voltage needs to exceed 3kV. Hence V rms needs to be exceeded is equal to (Vpk/ root2) = VPK =

( 2 VK ( V f -VK))

Where

VPK =

2.12 kV

1/2

Peak voltage of the voltage wave form.

Vf =

If x Tx(RCT+2RL+Rsr+RRMCAG)

Where Vf VPK =

=

Maximum voltage in absence of saturation ( 2x5550x (28547.6- 5550))

1/2

=

28547.6

=

15977.28 volts

=

15.98

volts

kVolts

VPK is 15.98kV which is more than 3kV hence Metrosiles are required.

Therefore select metrosil to limit the secondary voltage to 3kV peak.

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DOCUMENT NUMBER:


EA-086959

Metrosil requirement For this relay Metrosil proposed by the manufacturer has the following parameters. C

=

900

β

=

0.25

The current drawn by metrosil at relay setting voltage is given by formulae below. 0.52((√2xV')/C))1/β

Irms drawn= where

V' = voltage in (RMS Sine)

Metrosil recommended for 25-325V relay range @ 2kVrms 0.52x((√2x2000)/900)1/0.25

Irms drawn= =

50.72

A rms

At voltage setting Vs = 275V, Metrosil draws about 18mA

%Error

=

(0.018 / Ifs ) x 100

=

(0.018 / 21 ) x 100

=

0.387%

Error introduce by metrosil at voltage setting Vs = 275V is 0.086% only.

Metrosil selection:

(Refer Annexure-9)

To limit voltage to 2kVrms, select metrosil same as recommended by MCAG14 for Vs = 275V C

=

900

β

=

0.25

As per M&I materials catalogue attached, for the above 'C' and 'β' characteristics, the recommended metrosil type is 600A/S1/S1088. We recommend standard metrosil as per AREVA recommandation only as the relay & scheme is by AREVA. CT secondary fault current calculated as above =

21

Amps.

Hence, Metrosil withstanding capability is greater than CT secondary current.

2.7.3 Determination of primary fault current setting: Taking Primary fault currrent setting as 1% of maximum fault current i.e 63000 Amps. 1% of bus-bar fault current

=

630

amps

Primary Fault current setting Calculation The primary operating current or fault setting calculated as Ip=

{ n Im+ Ir +IM+IV}xT

Ip

=

Primary fault setting

n

=

number of CTs in parallel including 3 future bays

Im

=

exciting current of each CT at the relay circuit setting voltage

RMVTP31 =

=

Resistance of CT supervision relay MVTP 31(Assumed)

8.0 0.005

Amps

90000.0

ohms

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DOCUMENT TITLE:


IV IM Ir

= = =

DOCUMENT NUMBER:


EA-086959

Current in MVTP11 relay, (Vs/RMVTP31)

0.003

Amps

current in metrosil at the relay circuit setting voltage (Assumed) '=

0.018

Amps

Relay setting current

0.20

Amps

Where relay setting voltage is low then current in non linear resistor is ignored. = Primary fault setting (Ip) =

{ n Im+ Ir +IM+IV}xT {(8x0.005)+0.2+0.018+0.003}x3000 =

783.2

Amps.

2.7.4 Determination of stabilising resistor Rsr: (Refer MCAG 14 Manual attached, Annex-1, Sh. No.10) Relay circuit Voltage

Vs =

Relay setting current,

Is =

275.00 Volts 0.20 Amps

Relay burden at 275V setting is considered as 1VA, Stabilising resistor required, Rsr =

(Vs/Ir) - (Relay burden)/(Ir^2)

Rs=

= 1350.00 ohms

Select a resistor of range (0 -1500 ohms),0.31A continous,1.36A/3sec,1.8A/1sec as per MCAG 14 Manual.

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DOCUMENT TITLE:

DOCUMENT NUMBER:


EA-086959

2.8 CT: 811 B1.C1

Protection

:

CB fail protection

Core

:

CT: 811 B1.C1

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS


<



Vk >

3700 V at 2000A tap


Ie <

75


200%

Application : CB Fail Protection (50BF) Relay Type / Make: "RAICA", ABB,(50BF) CT calculation same as CT: 810 B1.C1. Refer above CT: 810 B1.C1 for detailed calculation.

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DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

2.9 CT: 811 B1.C2

Protection

:


Core

:

CT: 811 B1.C2

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS


<



Vk >

3700 V at 2000A tap


Ie <

75


200%

Application : OHL feeder protection Set-1 (87L-1,21-1) Relay Type / Make: "RED 670", ABB 2.9.1 Line Data: (Refer Annexure-7 attached) Line length as per annexure attached = Z1 =

0.00055+j 0.0108 p.u

Z0 =

0.00545+j 0.0322 p.u

50

km

Base MVA = 100 Base kV = 380 2

Base Impedance calculated = (BasekV )

= 1444

ohms

= 151.9

amps

Base MVA Base Current calculated = (Base MVA) √3 x Base kV

Zline in ohms calculated; (Base Impedance x p.u Impedance)

R1=

0.794 ohms

X1=

15.6

ohms

R0=

7.87

ohms

X0=

46.5

ohms

X/R =

17

sin(tan-1(X/R)) =

0.998

cos(tan-1(X/R)) =

0.059

Phase volt.= 219393.1

Volts

Phase Curr.= 63000

Amperes

2.9.2 Source impedance: Xs = (Ph vol/Ph cu)xsin(tan-1(X/R)) = 380000 x sin(tan-1(X/R))

Rs = (Ph vol/Ph cu)xcos(tan-1(X/R)) = 380000 x cos(tan-1(X/R))

Sqrt.(3)x63000 = Zs=

3.48 0.2 + j 3.48

ohms

Sqrt.(3)x63000 =

0.20

ohms

ohms

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DOCUMENT NUMBER:


EA-086959

2.9.3 Line impedance: X1 full Line: Line length x Reactance value/km =

15.5952

X0 full Line: Line length x Reactance value/km

ohms

=

R1 full Line: Line length x Resistance value/km

Z1 line

=

0.7942

ohms

=

0.7942 + j 15.6

ohms

46.4968

ohms

R0 full Line: Line length x Resistance value/km =

7.8698

Z0 line = 7.8698 + j 46.5

ohms ohms

2.9.4 THREE PHASE FAULT CONDITION Close in Fault Fault current =

63

X/R =

17

kA

Source Imp. Z1=Z2=Z0 0.2 = + j 3.48

ohms

Through fault current at the end of the line: 1) For 50 Km line Impedance calculated : (Rs + R1) + j(Xs+X1) (Positive sequence)

= (0.2+0.794) + j (3.48+15.6) = 0.994+j19.08


ohms ohms


380000 Sqrt.(3)x19.11


=

Amps

19.08 0.994

=

19.20

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DOCUMENT TITLE:



DOCUMENT NUMBER: EA-086959

Fault current calculation at the end of zone1 fault i.e 80% of line length: 1) For 50 Km line Impedance calculated : (Rs+0.8R1) + j(Xs+0.8X1) (Positive sequence)

= (0.2+0.635) + j (3.48+12.5) = 0.84+j16


ohms


380000 Sqrt.(3)x16.02


=

Amps

15.98 0.835

=

19.14

2.9.5 SINGLE PHASE-GROUND FAULT CONDITION: Through fault current at the end of the line: 1) For 50 Km line Impedance calculated : (3Rs+2R1+R0) + (Loop Impedance)

j(3Xs+2X1+X0) = 10.08+j88.12


ohms ohms


380000 Sqrt.(3)x88.69

I0 Earth fault X/R

= 2473.58 =

Amps

88.12 10.08

3I0

=

8.74

=

7420.73

Amps

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PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

Fault current calculation at the end of zone1 fault i.e 80% of line length: 1) For 50 Km line Impedance calculated : (3Rs+0.8x2R1+R0) + (Loop Impedance)

j(3Xs+0.8x2X1+X0) = 8.18+j72.5


ohms ohms


380000 Sqrt.(3)x72.96

= 3007.03 Earth fault X/R

=

Amps

72.50 8.18

3I0=

=

8.86

=

9021.097278

Amps

2.9.6 CT Requirement : ( As per Annexure-1, Sh. No.2)

Eal Eal Eal

> Ealreq > Ealreq > Ealreq

= {I kmax x I sn} / Ipn x (RCT + RL + SR / Ir 2 )

Equation-1 2

Equation-2

= 2 x {I tmax x I sn} / Ipn x (RCT + RL + SR / Ir ) = Itfdb x (Isn / Ipn) x (RCT + RL + SR / Ir

2

Equation-3

)

Where, Ikmax =

Maximum Primary fundamental frequency fault current for internal close-in faults (A)

Itfdb =

Maximum Primary fundamental frequency fault current for external faults (A) that passes through two CT's (A). Here for one and half breaker scheme Ikmax is equal to Itfdb.

Ipn =

The rated primary CT current (A)

Isn =

The rated secondary CT current (A)

Ir =

The rated current of the protection IED (A)

SR =

The burden of IED 670 a current input channel (VA). SR = 0.25 VA/channel.

Where,

For

2000

amps

Ealreq=

Required secondary e.m.f.

Eal =

Rated equivalent secondary e.m.f.= Vk

=

3700

volts

I K max =

Maximum short circuit current-Three phase

=

63000

amps

Itfdb =

Maximum Primary fault current for external faults (A)

=

63000

amps

I pn =


=

2000

amps

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DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

I sn =


=

1

amps

RCT =


=

3.1

ohms

RB

=

Burden of relay

=

0.25

ohms

RL

=

Lead resistance of cable. =For 6 sq.mm copper cable, RL= 3.08 ohm/kmeter at 20ºC.

Ir f

= =

α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1))

RL

1.88


2RL =

3.76

ohms

Protection terminal rated Current

=

1

amps

System Frequency

=

60

Hz

=

17

.= ( 17 / 2x 3.14x 60) x 1000

=

45.09

msec

Burden value for TFR (Refer Annexure-2,Sh. No.7)

=

0.01

VA

=

0.26

VA

Imin Sat=

Sat saturation detector min current

X/R =

System ratio

Tp

Primary time constant, (L/R)

=

L/R = (X/(2x 3.14x f )/R

RTFR =

Hence, total VA burden includong TFR

Voltage developed across CT as per ABB relay catalogue (Refer Annexure-1 Sh. No.2 ) At 2000/1 A tap Considering 20% margin Eal

> Ealreq = {I kmax x I sn} / Ipn x (RCT + RL + SR / Ir

2

Equation-1

)

Ealreq = 63000 x 1 x ( 3.1+ 1.88 + 0.26/1^2 )

=

224.3

volts

=

269.1

volts


Eal

> Ealreq = 2 x {I tmax x I sn} / Ipn x (RCT + RL + SR / Ir 2 )

Ealreq = 63000 x 1 x 2 x ( 3.1+ 1.88 + 0.26/1^2 )

Equation-2

=

448.6

volts

=

538.3

volts


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PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

At 2000/1 A tap Eal

> Ealreq = Itfdb x (Isn / Ipn) x (RCT + RL + SR / Ir

2

Equation-3

)

Ealreq = 63000 x 1x(3.1+ 1.88 +0.26/12 )

=

224.3

volts

=

269.1

volts



The Voltage developed across the CT secondary for distance protection (21L) feature as per ABB catalogue. (Refer Annexure-1 Sh. No. 3 ) Requirement -1 At 2000/1 A tap Eal

> Ealreq = {I kmax x I sn} / Ipn x a x (RCT + RL + SR / Ir

2

Equation-5

)

a' = 2 for primary time constant less than 50msec. With 20% extra margin Ealreq = 63000 x 1.2 x 2 x ( 3.1+ 1.88 + 0.26/1^2 )

=

538.3

volts

2000

Requirement -2 Eal

> Ealreq = Ikzone1x k x (Isn / Ipn) x (RCT + RL + SR / Ir 2 )

Equation-6

k' = 6 for primary time constant greater than 30 msec. Ikzone1= Maximum primary fundamental fault current at the end of zone 1 reach. At 2000/1 A tap and with 20% extra margin Ealreq = 13693.21 x 1.2 x 6 x ( 3.1+ 1.88 +0.26/12 )

=

350.98

volts

2000 Since CT rated knee point voltage is 3700V which is greater than the required value, the proposed CT is adequate.

BAY NUMBER:

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CROSS BAY C4

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3-083300.01

PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

2.10 CT: 811 B1.C3

Protection

:


Core

:

CT: 811 B1.C3

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS




Vk >

3700 V at 2000A tap


Ie <

75


200%

Application : OHL feeder protection - Set-2 (87L-2,21-2) Relay Type/make : ''MiCOM P546", Areva. 2.10.1 CT Calculation Where

For

Vk =

Knee point voltage of CT

RB =

Resistance of relay P543

Rr =

Relay resistance

RCT =


RL =


2000

amps

3700

Volts

=

0.04

ohms

=

3.1

ohms

For 6 sq.mm copper cable, RL= 3.08 ohm/kmeter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1))

RL =

1.88

ohms


2RL=

3.76

ohms

IP =


=

2000

amps

IS =


=

1

amps

ISCC max = Maximum short circuit current-Three phase

=

63000

amps

VK

CT knee point voltage specified

=

3700

volts

X/R =

System ratio

=

17

If

Maximum value of through fault current for =

31.50

( I f )x( X/R) =

535.5

=

stability ( multiple of Is) = I

SCC max

/ IP

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PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

The CT should meet the following Vk requirement as per Areva publication. ( Refer Annexure-1 Sh. No. 5 - 6 )

Vk1

>

K xI n x (RB + RCT +RL)

(equation -1) for through fault condition

Vk 2

>

KRPA xIFZ1 x (1+X/R)x(RB + RCT +RL+Rr)

(equation -2) for zone1 fault condition

Vk3

>

Kmax x IFmax x (RB + RCT +RL+Rr)

(equation -3) for close-up fault

Vk1 =

Accuracy limiting voltage for line through fault condition in volts

Vk2 =

Accuracy limiting voltage for end of zone 1 line fault in volts

Vk2 =

Accuracy limiting voltage for close in fault in volts

IFZ1 =

Maximum secondary fault current for end of zone 1 fault in amps. For 50kM line length , primary fault current (A) calculated is equal to = Amps. Hence, CT secondary fault current =

13693.21

13693.21 2000 =

6.85

Amps.

KRPA =

Fixed dimensioning factor for zone 1 fault and always

=

0.6

(Refer Annex-1, Sh. No. 7)

Kmax =

Fixed dimensioning factor for close in fault and always =

1.4


RB

Relay burden

=

Where K is dimensioning factor and depends upon the maximum value of through fault current(as a multiple of In) and primary system X/R ratio. For three end current differential schemes relay set at Is1=20%, Is2=2In, K1=30% and K2=100%, K' is calculated as below.


For through fault condition the fault current and X/R calculated above are IF =

11483.02

Amps. (Primary);

CT secondary fault currect calculated =

X/R =

19.20

5.74

If x X/R = 110.24 If, If x X/R < 1000xIn, K> 40 + 0.35 x (If x X/R) K> 40 + 0.35x(110.24) K> 78.584 As per AREVA relay catalogue, K > 78.584

BAY NUMBER:

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3-083300.01

PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

CT requirement for through fault condition: K x I n x ( RB + RCT +2RL )

Vk = .=

78.584 x 1 x ( 0.04 + 3.1 + 3.76 )

=

542

volts

Vk with 20 % margin

=

651

volts

Peak voltage

=

920.2

=

415

volts


=

498

volts

Peak voltage

=

704.8

=

221

volts


=

266

volts

Peak voltage

=

375.7

Vpeak

CT requirement for zone1 fault condition: Vk 2

>

KRPA xIFZ1 x (1+X/R)x(RB + RCT +RL+Rr)

= 0.6 x6.85 x (1+19.14) x (0.04 + 3.1 + 1.88)

Vpeak

CT requirement for close-up fault condition: Vk3

>

Kmax x IFmax x (RB + RCT +RL+Rr)

= 1.4 x 63000/2000 x (0.04 + 3.1 + 1.88)

Vpeak

Since, the CT rated knee point voltage is greater than the calculated value, the proposed CT is adequate.

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CROSS BAY C4

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3-083300.01


DOCUMENT TITLE:

DOCUMENT NUMBER:


EA-086959

2.11 CT: 811 B1.C4

Protection

:

Metering

Core

:

CT: 811 B1.C4

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

0.2

VA Burden

50

VA


200%

Application : Metering Burden Calculation (Refer Annexure-2) a

LCP Ammeter

b

3.2 VA


Mosaic panel Watt transducer, , AREVA, ISTAT300 Var transducer, AREVA, ISTAT300

d

(Assumed)

Energy metering panel NEXUS/1262

c

0.5 VA

1 VA


1 VA


Watt meter, PML ION6200

0.5 VA

(Assumed)

Var meter PML ION6200

0.5 VA

(Assumed)

DSM

0.1 VA

(Assumed)

Cabling loop (500 meters) For 4 sq.mm copper cable, RL= 0.00461 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)); Consider length of wire = 500 meters.

RL

=

2.812 Ohms

2RL

=

5.624 VA

Total connected burden, PBC =

12.42 VA

Considering 25% safe margin, connected VA equals to=

15.53 VA

CT Rated burden = 50VA

The total connected burden is less than the CT rated burden i.e 50VA. Hence the CT is adequate.

BAY NUMBER:

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CROSS BAY C4

34 of 50

3-083300.01


DOCUMENT TITLE:

DOCUMENT NUMBER:


EA-086959

2.12 CT: 811 B2.C4

Protection

:

Metering

Core

:

CT: 811 B2.C4

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

0.2

VA Burden

50 VA


200%

Application : Metering CT calculation same as CT: 810 B1.C4. Refer above CT: 810 B1.C4 for detailed calculation.

2.13 CT: 811 B2.C3

Protection

:


Core

:

CT: 811 B2.C3

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS




Vk >

3700 V at 2000A tap


Ie <

75


200%

Application : OHL feeder protection - Set-2 (87L-2,21-2) Relay Type/make : ''7SA522", Siemens. CT calculation same as CT: 810 B1.C3. Refer above CT: 810 B1.C3 for detailed calculation.

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Sheet No.


CROSS BAY C4

35 of 50

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DOCUMENT TITLE:

DOCUMENT NUMBER:


EA-086959

2.14 CT: 811 B2.C2

Protection

:

OHL feeder protn. Set-1 (87L-1,21-1)

Core

:

CT: 811 B2.C2

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS




Vk >

3700 V at 2000A tap


Ie <

75


200%

Application : OHL feeder protection Set-1 (87L-1,21-1) Relay Type / Make: "REL 531", ABB CT calculation same as CT: 810 B1.C2. Refer above CT: 810 B1.C2 for detailed calculation.

2.15 CT: 811 B2.C1

Protection

:

spare

Core

:

CT: 811 B2.C1

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS




Vk >

5550 V at 3000A tap


Ie <

50


200%

Application : spare

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Sheet No.


CROSS BAY C4

36 of 50

3-083300.01


DOCUMENT TITLE:

DOCUMENT NUMBER:


EA-086959

2.16 CT: 812 F.C1

Protection

:


Core

:

CT: 812 F.C1

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS




Vk >

5550 V at 3000A tap


Iex <

50


200%


Protection

:


Core

:

Core 1

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS


<



Vk >

5550 V at 3000A tap


Ie <

50


200%

Application : Bus-Bar Protection-Main-1 (87M1) Relay Type / Make: "MCAG 14", AREVA (Setting range: 20%-80% of 1A) CT calculation same as above for 87M1. Refer above CT: 810 F.C1 for detailed calculation.

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CROSS BAY C4

37 of 50

3-083300.01


DOCUMENT TITLE:

DOCUMENT NUMBER:


EA-086959

2.17 CT: 812 F.C2

Protection

:


Core

:

CT: 812 F.C2

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS




Vk >

5550 V at 3000A tap


Iex <

50


200%


Protection

:


Core

:

Core 2

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS


<



Vk >

5550 V at 3000A tap


Ie <

50


200%

Application : Bus-Bar Protection-Main-2 (87M2) Relay Type / Make: "MFAC 14", AREVA (Setting range: 25V-325V) CT calculation same as above CT: 810 F.C2. Refer above CT: 810 F.C2 for detailed calculation.

BAY NUMBER:

Sheet No.


CROSS BAY C4

38 of 50

3-083300.01


DOCUMENT TITLE:

DOCUMENT NUMBER:


EA-086959

2.18 CT: 812 F.C3

Protection

:

Spare

Core

:

CT: 812 F.C3

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS


<



Vk >

5550 V at 3000A tap


Iex <

50


200%

Application: Spare

BAY NUMBER:

Sheet No.


CROSS BAY C4

39 of 50

3-083300.01

PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

2.19 CT: 812 B2.C4

Protection

:

Metering

Core

:

CT: 812 B2.C4

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

0.2

VA Burden

50


200%

VA

Application : Metering CT calculation same as CT: 811 B1.C4. Refer above CT: 811 B1.C4 for detailed calculation.

2.20 CT: 812 B2.C3

Protection

:


Core

:

CT: 812 B2.C3

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS


<



Vk >

3700 V at 2000A tap


Ie <

75


200%

Application : OHL feeder protection - Set-2 (87L-2,21-2) Relay Type/make : ''MiCOM P546", Areva. CT calculation same as CT: 811 B1.C3. Refer above CT: 811 B1.C3 for detailed calculation.

BAY NUMBER:

Sheet No.


CROSS BAY C4

40 of 50

3-083300.01


DOCUMENT TITLE:

DOCUMENT NUMBER:


EA-086959

2.21 CT: 812 B2.C2

Protection

:

OHL feeder protn. Set-1 (87L-1,21-1)

Core

:

CT: 812 B2.C2

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS

CT Secondary resistance at 75º C, RCT ohms ) <



Vk >

3700 V at 2000A tap


Ie <

75


200%

Application : OHL feeder protection Set-1 (87L-1,21-1) Relay Type / Make: "RED 670", ABB CT calculation same as CT: 811 B1.C2. Refer above CT: 811 B1.C2 for detailed calculation.

2.22 CT: 812 B2.C1

Protection

:

BF protection (50BF)

Core

:

CT: 812 B2.C1

CT Ratio

:

3000-2500-2000-1500-1250-1000-750 /1A

Class of Accuracy

:

TPS




Vk >

3700 V at 2000A tap


Ie <

75


200%

Application : CB Fail Protection (50BF) Relay Type / Make: "RAICA", ABB,(50BF) CT calculation same as CT: 810 B1.C1. Refer above CT: 810 B1.C1 for detailed calculation.

BAY NUMBER:

Sheet No.


CROSS BAY C4

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3-083300.01

PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

380kV VT SIZING CALCULATION

3

3.1 VT LEAD RESISTANCE CALCULATION : VT secondary lead size considered is 4 sq.mm. 4 sq.mm copper cable resistance at 200C is 4.61 ohms/km.i.e Rdc at 200C = 4.61 ohm/km Rdc at 75ºC = R20(1+α20(T2-T1)); α at 20ºC = 0.004,Where α= temperature co-efficient of resistance. Hence, Rdc at 75ºC = 4.61(1+0.004(75-20)); =

5.62

ohm/km

Consider a distance from 380kV GIS CT to relay panel as per layout attached with considerable safe margin = 500 meter, Lead resistance calculated is, =

5.62 x 0.5

=

2.81

ohms for 500 meters

380kV ABU HADRIYAH- MANIFA LINE-2 CCVT Details : Core-1

Core-2

380kV/√3/110V/√3-110V

380kV/√3/110V/√3-110V

Class

:

0.2/3P

0.2/3P

VA Burden

:

100

100

Vector group :

Star-Star

Star-Star

Voltage Factor :

1.2 Cont.,

1.2 Cont.,

1.9 for 30 sec

1.9 for 30 sec

VT Ratio

:

Calculation of VT burden : Calculation of Lead burden: RL

= Lead resistance of wire.

For 4 sq.mm copper cable, RL= 0.00461 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)), RL=

2.81

Calculation of Lead current at rated burden :(IVT) =

ohms

0.1939 Amperes

Lead current is calculated considering Total VA burden. Hence, Lead current calculated =100/63.5 RB= Lead burden, 2xRLx (IVT^2)

0.19

= =

Amperes 0.2112 VA

RB= (2 x 2.81 x 0.1939 x 0.1939)

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PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

Core-1 : Relays / Instruments

Relay type Quantity Unit burden

Total burden (VA)

FFR (98L) A811/A812

RXBA 4

1

2

2

(Annexure-2 Sh. No.9)

Line set-1 protection

RED670

1

0.1

0.1


Transient Fault Recorder

TR2000

1

0.01

0.01


FFR (98) (Meas.) for set-1 protection

RXBA 4

1

2

2


FFR (98) (Ref.) for set-2 protection

RXBA 4

1

2

2


FFR (98) (Ref.) for Energy meter

RXBA 4

1

2

2


FFR (98L2) (Ref.) for 25AR

RXBA 4

1

2

2


1

0.2

0.2

1

2

2

DSM FFR (98) 25AR/A811 FOR AF-2

RXBA 4

Total VA

=

Hence, total required burden of VT (Meters/relays plus lead burden)

=

Assumed (Annexure-2 Sh. No.9)

12.31

VA per phase

12.52

VA

.= (VA Connected + VA Lead) The Burden calculated considering 25% safety margin =

15.7

VA

Since, the connected burden is less than 100VA,the VT burden is adequate.

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PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

Core-2: Relays / Instruments

Relay type

Quantity Unit burden

Total burden (VA)

25MC/A811

KVAS100

1

0.02

0.02


25MC/A812

KVAS100

1

0.02

0.02


FFR (98L) (Meas.) A811/A812

RXBA 4

1

2

2


FFR (98) (Ref.) for set-1 protection

RXBA 4

1

2

2


FFR (98) (Meas.) for 67N-2

RXBA 4

1

2

2


MICOMP546

1

0.02

0.02


25AR / A812

KVAS100

1

0.02

0.02


25AR / A811

KVAS100

1

0.02

0.02


FFR (98L2) (Meas.) / 25AR

RXBA 4

1

2

2


FFR (98B2) (Meas.) / A812

RXBA 4

1

2

2


FFR (98) (Meas.) / A811

RXBA 4

1

2

2


25AR / A811 FOR AF-2

KVAS100

1

0.02

0.02


(27L2), Under voltage relay

RAEDA1

3

4.4

13.2

(Annexure-2 Sh. No. 11)

Voltage transducer for SCADA

ISTAT300

1

0.1

0.1


Watt meter Watt transducer for SCADA

ISTAT300

1

0.1

0.1


Var meter Var transducer for SCADA

ISTAT300

1

0.1

0.1


Voltmeter, PML

ION6200

1

0.5

0.5

Assumed

Wattmeter, PML

ION6200

1

0.5

0.5

Assumed

VARmeter, PML

ION6200

1

0.5

0.5

Assumed

Nexus/1262

1

5+3.2

8.2


Under voltage relay

RAEDA1

1

4.4

4.4


FFR (98) (Meas.) for revenue meter

RXBA 4

1

2

2

Under voltage relay

RAEDA1

1

4.4

4.4


Voltmeter

ION6200

1

0.5

0.5

Assumed


Transducer Panel

Energy metering panel Energy meter


LCP

Total VA

=


=

46.62

VA per phase

46.83

VA


58.5

VA

Since, the connected burden is less than 100VA,the provided VT burden is adequate.

BAY NUMBER:

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PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

3.3 380kV ABU HADRIYAH- AL-FADHILI LINE-2 CCVT Details : Core-1

Core-2

380kV/√3/110V/√3-110V

380kV/√3/110V/√3-110V

Class

:

0.2/3P

0.2/3P

VA Burden

:

100

100

Vector group :

Star-Star

Star-Star

Voltage Factor :

1.2 Cont.,

1.2 Cont.,

1.9 for 30 sec

1.9 for 30 sec

VT Ratio

:




2.81


ohms

0.1954 Amperes


0.20

= =

Amperes 0.2147 VA

RB= (2 x 2.81 x 0.1954 x 0.1954)


Relay type


Total burden (VA)

FFR 98-25AR/A811 FOR MAIN-2

RXBA 4

1

2

2



REL 531

1

0.2

0.2


Transient Fault Recorder

TR2000

1

0.01

0.01



RXBA 4

1

2

2


FFR (98) (Ref.) for 67N-2

RXBA 4

1

2

2


FFR (98) (Ref.) for Energy meter

RXBA 4

1

2

2


FFR (98L2) (Ref.) for 25AR

RXBA 4

1

2

2


1

0.2

0.2

1

2

2

DSM FFR (98L) (Ref.) for 25MC 810

RXBA 4

Total VA

=


=

Assumed (Annexure-2 Sh. No.9)

12.41

VA per phase

12.62

VA


15.8

VA


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PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959


Relay type


Total burden (VA)

25MC/A811

RASC

1

0.25

0.25


25MC/A810

RASC

1

0.25

0.25


FFR (98L) (Meas.) A810/A811

RXBA 4

1

2

2


FFR (98) (Ref.) for 67N-1

RXBA 4

1

2

2



RXBA 4

1

2

2



7SA522

1

0.1

0.1


25AR / A810

RASC

1

0.25

0.25


25AR / A811 FOR MAIN-2

RASC

1

0.25

0.25


27-L2 Under voltage relay

RAEDA1

3

4.4

13.2


FFR (98B1) (Meas.) /A810

RXBA 4

1

2

2


Voltage transducer for SCADA

ISTAT300

1

0.1

0.1


Watt meter Watt transducer for SCADA

ISTAT300

1

0.1

0.1


Var meter Var transducer for SCADA

ISTAT300

1

0.1

0.1


Voltmeter

PML

1

0.5

0.5

Assumed

Wattmeter

PML

1

0.5

0.5

Assumed

VARmeter

PML

1

0.5

0.5

Assumed

Revenue meter

ELESTER

1

0.0173

0.0173


Under voltage relay

RAEDA1

1

4.4

4.4


FFR (98) (Meas.) for revenue meter

RXBA 4

1

2

2

FVS-UDC12

1

4.4

4.4

Assumed

PML

1

0.5

0.5

Assumed

Transducer Panel

Revenue metering panel


LCP Under voltage relay Voltmeter

Total VA

=


=

35.42

VA per phase

35.63

VA


44.5

VA


BAY NUMBER:

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PROJECT:

DOCUMENT TITLE:


3.4 380kV BUS1-VT

DOCUMENT NUMBER:


EA-086959

(Refer Annexure-4A)

VT Details : Core-1

Core-2

380kV/√3/110V/√3-110V

380kV/√3/110V/√3-110V

Class

:

0.2/3P

0.2/3P

VA Burden

:

100

100

Vector group :

Star-Star

Star-Star

Voltage Factor :

1.2 Cont.,

1.2 Cont.,

1.9 for 30 sec

1.9 for 30 sec

VT Ratio

:




2.81


ohms

0.0945 Amperes


0.09

= =

Amperes 0.0502 VA

RB= (2 x 2.81 x 0.0945 x 0.0945)


Relay type


Total burden (VA)

FFR (98B1) (Meas.) 25AR/810

RXBA 4

1

2

2


FFR (98B1) (Meas.) 25AR/807

RXBA 4

1

2

2


FFR (98B1)-25MC/A810

RXBA 4

1

2

2


Total VA

=


=

6 VA per phase 6.05 VA

.= (VA Connected + VA Lead) Considering 25% safety margin for any additional FFR relay required. The Burden calculated considering 25% safety margin =

7.6

VA


BAY NUMBER:

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PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959


Relay type


Total burden (VA)

25MC/A804

RASC

1

0.25

0.25


25MC/A807

KVAS100

1

0.02

0.02


25MC/A810

RASC

1

0.25

0.25


98B1-25MC/810

RXBA 4

1

2

2


98B1-25AR/807

RXBA 4

1

2

2


98B1-25AR/810

RXBA 4

1

2

2


25AR / A807

RASC

1

0.25

0.25


25AR / A810

RASC

1

0.25

0.25


TR2000

1

0.01

0.01


1

0.2

0.2

Assumed

ISTAT300

1

0.1

0.1


PML

1

0.5

0.5

Assumed

PML

1

0.5

0.5

Assumed

Transient Fault Recorder DSM Transducer panel Voltage transducer for SCADA Voltmeter LCC Voltmeter Total VA

=


=

8.33 VA per phase 8.38 VA


10.5

VA


BAY NUMBER:

Sheet No.


CROSS BAY C4

48 of 50

3-083300.01

PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959

3.5 380kV BUS2-VT VT Details :

(Refer Annexure-4A) Core-1

Core-2

380kV/√3/110V/√3-110V

380kV/√3/110V/√3-110V

Class

:

0.2/3P

0.2/3P

VA Burden

:

100

100

Vector group :

Star-Star

Star-Star

Voltage Factor :

1.2 Cont.,

1.2 Cont.,

1.9 for 30 sec

1.9 for 30 sec

VT Ratio

:




2.81


ohms

0.0945 Amperes


0.09

= =

Amperes 0.0502 VA

RB= (2 x 2.81 x 0.0945 x 0.0945)


Relay type


Total burden (VA)

FFR (98B2) (Meas.) 25AR/806

RXBA 4

1

2

2


FFR (98B2) (Meas.) 25AR/812

RXBA 4

1

2

2


FFR (98B2)-25MC/A812

RXBA 4

1

2

2


Total VA

=


=

6 VA per phase 6.05 VA


7.6

VA


BAY NUMBER:

Sheet No.


CROSS BAY C4

49 of 50

3-083300.01

PROJECT:

DOCUMENT TITLE:


DOCUMENT NUMBER:


EA-086959


Relay type


Total burden (VA)

25MC/A806

RASC

1

0.25

0.25


25MC/A809

RASC

1

0.25

0.25


25MC/A812

KVAS100

1

0.02

0.02


98B2-25MC/812

RXBA 4

1

2

2


98B2-25AR/806

RXBA 4

1

2

2


98B2-25AR/812

RXBA 4

1

2

2


25AR / A806

RASC

1

0.25

0.25


25AR / A812

KVAS100

1

0.02

0.02


TR2000

1

0.01

0.01


1

0.2

0.2

Assumed

ISTAT300

1

0.1

0.1


PML

1

0.5

0.5

Assumed

PML

1

0.5

0.5

Assumed

Transient Fault Recorder DSM Transducer panel Voltage transducer for SCADA Voltmeter LCC Voltmeter Total VA

=


=

8.1 VA per phase 8.15 VA


10.2

VA


BAY NUMBER:

Sheet No.


CROSS BAY C4

50 of 50

3-083300.01

ANNEXURE-1 CT requirements of relay Sr No.

Description

Make

Type

Page No.

1

Line differential protection main-1

ABB

RED670

2

2


AREVA

MICOMP546

5

3

Busbar differential protection

AREVA

MCAG14

8

4


AREVA

MFAC14

11

5

CT circuit supervision relay

AREVA

MVTP11

15

6

Breaker failure protection relay

ABB

RAICA

16

7

Transient fault recorder

ROCHESTER

TR2000

17

8


ABB

REL531

20

9


SIEMENS

7SA522

24

Annexure-: CT Requirement of Relay

Page 1


Page 2


Page 3


Page 4


Page 5


Page 6


Page 7


Page 8


Page 9


Page 10


Page 11


Page 12


Page 13


Page 14


Page 15


Page 16


Page 17


Page 18


Page 19


Page 20


Page 21


Page 22


Page 23


Page 24

ANNEXURE-2 VA burden requirements of relay Sr No.

Description

Make

Type

Page No.

1


ABB

RED670

2

2


AREVA

MICOMP546

3

3


AREVA

MCAG4

4

4

CT circuit supervision relay

AREVA

MVTP11

5

5

Breaker failure protection relay

ABB

RAICA

6

6

Transient fault recorder

ROCHESTER

TR2000

7

7

Energy Meter

Electro Ind.

NEXUS1262

8

8

Fuse failure relay

ABB

RXBA4

9

9

Synchro check relay

AREVA

KVAS100

10

10

Undervoltage relay

ABB

RAEDA1

11

11


ABB

REL531

12

12

Transducer

AREVA

ISTAT300

13

13


ABB

REL531

14

14


SIEMENS

7SA522

16

15

Synchro check relay

ABB

RASC

17

16

Revenue Meter

ELSTER

A3 ALPHA

18

Annexure-: VA Requirement of Relay

Page 1


Page 2


Page 3


Page 4


Page 5


Page 6


Page 7


Page 8


Page 9


Page 10


Page 11


Page 12


Page 13


Page 14


Page 15


Page 16


Page 17


Page 18

ANNEXURE-3 SAUDI CABLE CATALOGUE

ANNEXURE-4 380kV GIS CT DATA

Ref.No. NA40034NA40034-D020 Date : 9 May, May, 2006 Rev.2 5 Aug. 2009 Rev.3 12 Aug.,2009 Rev.4 18 Aug.,2009

TECHNICAL SPECIFICATION FOR CT

Project : Contract No. : Specification :

New 380/115kV ABU HADRIYAH BSP 30531099/00 380kV 63kA 3150/2000A GIS

1. Applicable Standard - IEC 60044-1, IEC 60044-6 2. Ratings - Symmetric short circuit (Ith) : 63kA rms - Dynamic short circuit (Idyn) : 163.8kA peak - Continuous thermal current rating factor : 2.0

1) GCB A810 Specification Location

Current Ratio

Adopted

Class

Ual

Side

Side

Burden

Kssc

K

Rb

<75mA

-

31.5

12.63

6.2

CT-1

<75mA

-

31.5

12.63

6.2

CT-1

Ω

<75mA

-

31.5

12.63

6.2

CT-1

-

50VA

-

-

-

<50mA

-

21

18.95

9.3

CT-1

87B1/M1

<50mA

-

21

18.95

9.3

CT-1

87B1/M2

<50mA

-

21

18.95

9.3

CT-1

SPARE

1

2000/1A

TPS

>3700V

2

3000-2500-2000-15001250-1000-750/1A

2000/1A

TPS

>3700V

℃ <3.1Ω <3.1Ω

3000-2500-2000-15001250-1000-750/1A

2000/1A

TPS

>3700V

<3.1

4

3000-2500-2000-15001250-1000-750/1A

2500/1A

0.2

SF<5

1

3000-2500-2000-15001250-1000-750/1A 3000-2500-2000-15001250-1000-750/1A 3000-2500-2000-15001250-1000-750/1A

3000/1A

TPS

>5550V

3000/1A

TPS

>5550V

3000/1A

TPS

>5550V

3

Bus-2

Ial

3000-2500-2000-15001250-1000-750/1A

@75

TAP Bus-1

Rct

2 3

Type

-

Ω <4.65Ω <4.65Ω <4.65

50BF/A810 AL-FADHILI LINE-2 SET-2 AL-FADHILI LINE-2 SET-1 AL-FADHILI LINE-2 MET.

NOTE: 1. CT-2 TYPE: Present design - 3000/1A Tap Rct<6.7ohm --- The CT is CT-2 type. If the CT will be used 2000/1A tap, Rct will be <4.65 ohm, not <3.1ohm. 2. CT-1 TYPE: Present design - 2000/1A Tap Rct<3.1ohm --- The CT is CT-1 type. If the CT will be used 3000/1A tap, Rct will be <4.7ohm, not <6.7ohm.


Current Ratio

Adopted

Class

Ual

Side

Side

Burden

Kssc

K

Rb

<75mA

-

31.5

12.63

6.2

CT-1

<75mA

-

31.5

12.63

6.2

CT-1

Ω

<75mA

-

31.5

12.63

6.2

CT-1

-

60VA

-

-

-

1

2000/1A

TPS

>3700V

2

3000-2500-2000-15001250-1000-750/1A

2000/1A

TPS

>3700V

℃ <3.1Ω <3.1Ω

3000-2500-2000-15001250-1000-750/1A

2000/1A

TPS

>3700V

<3.1

4

3000-2500-2000-15001250-1000-750/1A

3000/1A

0.2

SF<5

1

3000-2500-2000-15001250-1000-750/1A

3000/1A

TPS

>5550V

2

3000-2500-2000-15001250-1000-750/1A

2000/1A

TPS

3000-2500-2000-15001250-1000-750/1A

2000/1A

3000-2500-2000-15001250-1000-750/1A

2500/1A

3

Bus-2

Ial

3000-2500-2000-15001250-1000-750/1A

@75

TAP Bus-1

Rct

3 4

Type

-

LINE-2 SET-1 MANIFA LINE-2 SET-2 LINE-2 MET.

<50mA

-

21

18.95

9.3

CT-1

>3700V

<75mA

-

31.5

12.63

6.2

CT-1

TPS

>3700V

<3.1

Ω

<75mA

-

31.5

12.63

6.2

CT-1

0.2

SF<5

-

50VA

-

-

-

-

MANIFA

MANIFA

Ω <3.1Ω

<4.65

50BF/A811

SPARE AL-FADHILI LINE-2 SET-1 AL-FADHILI LINE-2 SET-2 AL-FADHILI LINE-2 MET.



Current Ratio

Adopted

Class

Ual

3000/1A

TPS

>5550V

3000/1A

TPS

>5550V

3000/1A

TPS

>5550V

2000/1A

TPS

>3700V

3000-2500-2000-15001250-1000-750/1A

2000/1A

TPS

>3700V

℃ <4.65Ω <4.65Ω <4.65Ω <3.1Ω <3.1Ω

Side

1 2 3

Bus-2 Side

1 2 3

3000-2500-2000-15001250-1000-750/1A

2000/1A

TPS

>3700V

<3.1

4

0.2

SF<5

3000-2500-2000-15001250-1000-750/1A 3000-2500-2000-15001250-1000-750/1A 3000-2500-2000-15001250-1000-750/1A 3000-2500-2000-15001250-1000-750/1A

3000-2500-2000-15001250-1000-750/1A

3000/1A

Ial

Burden

Kssc

K

Rb

<50mA

-

21

18.95

9.3

CT-1

87B2/M1

<50mA

-

21

18.95

9.3

CT-1

87B2/M2

<50mA

-

21

18.95

9.3

CT-1

SPARE

<75mA

-

31.5

12.63

6.2

CT-1

50BF/A812

<75mA

-

31.5

12.63

6.2

CT-1

<75mA

-

31.5

12.63

6.2

CT-1

-

60VA

-

-

-

@75

TAP Bus-1

Rct

Type

Ω

-

MANIFA LINE-2 SET-1 MANIFA LINE-2 SET-2 MANIFA LINE-2 MET.


ANNEXURE-4A 380kV GIS DATA SCHEDULE FROM TOSHIBA

ANNEXURE-5 SUBSTATION ELECTRICAL LAYOUT-PLAN


TITLE:

SR.NO. 1.0 2.0 3.0 NOTE:


ABUHADRIYAH 380/115kV BSP CT LEAD ROUTE LENGTH CALCULATION DRAWING REFERENCE: ABU-HADRIYAH SUBSTATION ELECTRICAL LAYOUT -EA-009912

FROM BAY NO. CROSS BAY C4 CROSS BAY C3 CROSS BAY C2

TO RELAY PANEL RP RP RP

LENGTH MEASURED LENGTH AFTER TERMINATION IN METERS (WITH 30% MARGIN) IN METERS 250 325 230 299 210 273

LENGTH SELECTED IN METERS 500 400 350

CT LEAD LENGTH IS CONSIDERED AS 500 METERS ON CONSIDERABLY SAFER SIDE TO ACOUNT FOR ANY CIRCUIT CHANGES IN FUTURE. HENCE, CT LEAD LENGTH IS ESTIMATED AS 500 METERS FOR ALL BAYS CT SIZING CALCULATION.

ANNEXURE-6 RELAYING & METERING ONE LINE DIAGRAM

ANNEXURE-7 LINE PARAMETERS

ANNEXURE-8 M&I METROSIL CATALOGUE

ANNEXURE-9 380kV CVT DATA SCHEDULE

380kV CT-VT calculation_C4_Rev_D 17.12.09

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