Total Earthing System

CLIENT CONSULTANT CONTRACTOR PROJECT: PACKAGEII : DOCUMENT NAME : REV

DOCUMENT NO.

‐

2

SUMMARY SHEET The total plant is divided into the following major areas and the soil resistivity considered for calculation (based on soil report) are as follows 1

SS1 SUBSTATION

‐

70.53

Ωm 14 TRANSFER HOUSE (TH2A)

‐

151.39

Ωm

2

SS2 SUBSTATION

‐

25.050

Ωm 15 PARKING STATION (PS1)

‐

151.39

Ωm

3

SS3 SUBSTATION

‐

25.050

Ωm 16 PARKING STATION (PS2)

‐

35.100

Ωm Ωm

4

TRANSFER HOUSE (TH1)

‐

72.640

Ωm 17 TRANSFER HOUSE (TH3)

‐

35.100

5

SILO BUILDING

‐

151.390


‐

44.840

Ωm

6

TAIL DRIVE HOUSE

‐

151.390


‐

41.940

Ωm

7

TRANSFER HOUSE (TH2)

‐

151.390


‐

128.940

Ωm

8

PUMP HOUSE1

‐

205.510

Ωm 21 PUMP HOUSE2

‐

228.680

Ωm

9

AT HTP1

‐

128.380

Ωm 22 AT HTP2

‐

70.150

Ωm

10

AT HTP3

‐

25.050

Ωm 23 AT HTP4

‐

26.040

Ωm

11

AT HTP5

2 ‐

49.870

Ωm 24 AT HTP6

‐

37.530

Ωm

12

AT HTP7

‐

51.150

Ωm 25 AT HTP8

‐

35.100

Ωm

13

AT SECONDARY CRUSHER

‐

441.550

Ωm 26 AT TRANDFER STATION

‐

49.890

Ωm

The earth grid values of each areas is calculated seperately and all these areas are interconnected through earth flat.The combined earth resistance for the total layout as per project specifications shall be less than 1 Ω Calculation of overall Earth resistance of the total plant 10 1.0

2

Earth Resistance around Electrical Substation Building SS1 R1

=

0.81

10.0 Refer AnnexureI

Earth Resistance around Electrical Substation Building SS2 R10

=

0.29

Refer AnnexureX

2.0 Earth Resistance around Electrical Substation Building SS3 & Earth 11.0 Resistance around Pump house Building 2 Refer AnnexureII R2 = 0.82

Earth Resistance around Transfer House TH1

3.0 Earth Resistance around silo building

Earth Resistance around Travel drive house

R3

=

12.0 9.61

Refer AnnexureIII

4.0 Earth Resistance around Transfer House TH2 R4

=

9.61

13.0 Refer AnnexureIV

5.0 Earth Resistance around parking station PS1 R5

=

9.61

14.0 . Refer AnnexureV


=

2.23

15.0 Refer AnnexureVI


=

2.66

16.0 Refer AnnexureVII

8.0 Earth Resistance around Pump house1 R8 9.0

=

17.0 10.44

Refer AnnexureVIII

R11

R12

=

=

4.61

9.61

Refer AnnexureXI

Refer AnnexureXII

Earth Resistance around Transfer House TH2A R13

=

9.61

Refer AnnexureXIII

Earth Resistance around parking station PS2 R14

=

4.46

Refer AnnexureXIV

Earth Resistance around Transfer House TH4 R15

=

2.85

Refer AnnexureXV

Earth Resistance around Transfer House TH6 R16

=

8.19

Refer AnnexureXVI

Earth Resistance Near Transfer Station R17

=

6.33

Refer AnnexureXVII

Earth Resistance of down hill conveyor DHC723 at Near HTP2 (TR64) R9A

=

0.80

2

Refer AnnexureIX

10.0 Earth Resistance of down hill conveyor DHC723 at Near HTP6 (TR107) R9B

2

DOC.NO.-EL00007,REV-02

=

0.75

Refer AnnexureIXA

1 OF 42

SUMMARY

Note:The Overall Plant Earth Grid resistance value will be reduced when all Tail End TH's & SS grid will be interconnected. 1 R

=

1 R1

1 R

=

1 0.81

1 R 1 R 1 R

=

1 R3

+

1 R4

+

1 R5

+

1 R8

+

1 R11

+

1 R12

+

1 R13

+

1 9.61

+

1 9.61

+

1 9.61

+

1 10.44

+

1 4.61

+

1 9.61

+

1 9.61

0.81 + 0.81 x

9.61 9.61

9.61 9.61

+ x

9.61 9.61

10.44 10.44

+ x

4.61 4.61

+

9.61 9.61

+ x

9.61 9.61

+

+

+

=

10.43 7.83

+

19.22 92.38

+

15.05 48.14

+

19.22 92.38

+

0.21

+

0.31

+

0.21

=

1.33

1 R

=

2.06

R

=

1 2.06

R

=

0.485

Note: Refer the Earthing Pit & Strip Scheme for overall plant.

Finally we calculate as

RT

2

Ohms Earth Resistance of overall plant Tail end side

0.49

=

Note: The Overall Plant Earth Grid resistance value will be reduced when all Head End TH's & SS grid will be interconnected. 1 R

=

1 R2

1 R6

+

1 R7

+

1 R10

+

1 R14

+

1 R15

+

1 R16

+

1 R17

1 R

=

1 0.82

+

1 2.23

+

1 2.66

+

1 0.29

+

1 4.46

+

1 2.85

+

1 8.19

+

1 6.33

0.82 + 0.82 x

2.23 2.23

2.66 2.66

+ x

0.29 0.29

4.46 4.46

+ x

2.85 2.85

+

8.19 8.19

+ x

6.33 6.33

+

1 R

=

1 R

=

3.05 1.83

+

2.95 0.77

+

7.30 12.69

+

14.52 51.86

+

3.83

+

0.58

+

0.28

1 R

=

1.67

1 R

=

6.36

R

=

1 6.36

R

=

0.157


2

+

+

Note: Refer the Earthing Pit & Strip Scheme for overall plant.

RT

=

0.16

Ohms Earth Resistance of overall plant Head end side

NOTE: 1 The calculated earth pit qty.are minimum to be provided at site.However as per site condition,the overall resistance is not achived less than 1 Ω with above earth pit qty than additional pits shall be provided to meet the overall grid resistance less than 1 Ω. 2 Earth flat running through cable tray will be consider as interconnection between two grids wherever ground profile is not hilly area.


2 OF 42

SUMMARY

CALCULATION OF MAIN GRID CONDUCTOR & EARTHING STRIP

REFERENCE IEC:60364-5-54 IS:3043

=

ENTER THE VALUE IN YELLOW COLOR BOXES ONLY

STEP-1 : BASIC DESIGN DATA 1.00 SYSTEM DATA

Vs

1.01 System nominal voltage MV Voltage

=

11

kV

25

kA

1

sec

=

1

sec

=

0.415

kV

50

kA

1

sec

=

The value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which can 1.02 flow through the protective device for HV System (see IEC 60909-0);

If

1.03 The operating time of the protective device for automatic disconnection in s;

ts

=

1.04 Fault clearing time

tsc

1.05 System nominal voltage LV Voltage

Vs

1.06

The value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which can flow through the protective device for LV System (see IEC 60909-0);

=

If


tsc

=

Pipe

=

Steel

QC

=

3.8 x 10-3

β

=

202

2.00 Earthing Conductor Data 2.01 Earth Electrode Material (Rod or Pipe) 2.02 Volumetric heat capacity of conductor material

J/0C mm3

(J/oC mm3) at 20 oC 2.03 Reciprocal Of temp.Cofficient of resistivity at O 0C

°C

for the conductor (2020C as IEC 60364-5-54)

ρ20

=

138x10-6

2.05 Initial temperature of conductor (40 0C)

θi

=

45

2.06 Final temperature of conductor (200 0C)

θf

=

500

2.04 Electrical resistivity of conductor material at 200C

Ω-mm

°C

3.00 CALCULATION FOR SIZING OF EARTH CONDUCTOR BASED ON 11KV SYSTEM

Minimum Cross sectional area required = A As per IEEE - 80 ,the minimum cross sectional area of the earthing conductor to withstand the Short circuit current is given by A If

= Is the cross-sectional area, in mm2; =

is the value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which can flow through the protective device (see IEC 60909-0);

t = is the operating time of the protective device for automatic disconnection in s; k

= is the factor dependent on the material of the protective conductor, the insulation and is the factor dependent on the material of the protective conductor, the insulation and

A

(If √ t) k

=

The factor of K is determine from the formula (Annex A - IEC - 60364-5-54) 0

k

Qc( + 20 C)

=

ln

ρ20

1+

θf - θi

 + θi

Qc(β + 20°C)

=

ρ20

The value of

k

80

=

k

=

k

=

80

for steel as per ,Table A.54.1 of IEC 60364-5-54

x

ln

1+

500 202

+

45 45

=

80

x

1.045

81.76

Therefore ,the area of conductor for the maximum fault level of 40A and consider the fault clearing time is < 0.5 sec.the conductor area is

25000 A

=

A

=

X

1

81.76 Considering 15% corrosion allowance of the strip will be

306

A

Sq.mm

Hence the calculated minimum diameter of the GI rod

A

=

D

=

D

=

D

=

=

351.63

Sq.mm

Hence the calculated minimum width & Thickness of the Earthing strip

∏D²/4

Earthing Conductor(strip) width

=

Earthing Conductor(strip) Thickness

=

40 X 10

mm mm

Ax4 П 306 x 3.142 20

4

2

However as per TS 75x10mm strip shall be used for main earthing grid.

mm

Considering 15% corrosion allowance the diameter of the MS rod will be 32mm will be sufficient However we will select a standard size of 100mm MS rod for the main earth mat below ground as per contract specifications.

D =


100Ø mm

6 OF 42

MAIN CONDUCTOR SIZING

TRANSFER STATION GROUNDING CALCULATION

ANNEXURE-XVII REFERENCE IEC:60364-5-54 IS:3043

=


STEP-1 : BASIC DESIGN DATA 1.00

SYSTEM DATA Vs

1.01 System nominal voltage

= =

The value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which 1.02 can flow through the protective device (see IEC 60909-0);

If


ts

=

415

V

50

kA

1

sec

tsc

=

LxB

=

1.06 Area of earth grid around Substation

A

=

41.25

1.07 Resistivity of the soil

ρ

=

49.89

1.09 Design Ambient temperature

Ta

=

45

°C

2.01 Length of burial of Earthing Strip

L

=

2600.0

cm

2 02 Depth 2.02 D th off b burial i l off conductor d t (St (Strip) i )

ω

=

80

cm

t

=

7.50

cm

1.04 0 Fault clearing time 1.05 Length and breadth of the earth grid around Substation

2.00

sec x

5.5 m

m

2

Ω-m

Buried earth conductor (strip)

2.03 Width (Incase of strip) of the conductor (Strip) 2.04

1 7.5

2

Earth conductor (Rod or Pipe) Pipe

=

G.I.Pipe

2.06 Length of earth electrode rod/pipe

l

=

3

Mtr.

2.07 Diameter of earth electrode rod/pipe

d

=

100

mm

2.05 Earth Electrode Material (Rod or Pipe)

2

Resistance of Buried earth conductor (Strip) Th resistance The i t off earth th grid id can be b calculated l l t d by b using i the th formula f l As per IS:3043 clause no.9.2.3

L = Length of the Strip (in Cm) ω = Depth of burial of the Earthing strip cm t = Width(incase of Strip) or twice the diameter(fir Conductors) in cm. ρ = Resistivity of the soil in Ω m Rg = Resistance of the earth conductor

Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 49.89) (2 x 3.142 x 2600)

Rg =

0.305354

Rg =

3.06

ln

X

(2xL L² ) (ωx t) ln

(2 x 6760000) (80 x 7.5)

10.023

The resistance of the earth Conductor (Strip)

Rg =


3.06

ohms

41 OF 42

TRANSFER STATION

Resistance of earth Electrode (Steel Rod Or Pipe) As per IS:3043 clause no.9.2.2 l

= Length of rod or Pipe (in Cm)

d = Diameter of rod or pipe in cm

ρ = Resistivity of the soil in Ω m Re = Resistance of the earth Electrode The resistance of earth electrode is given by

Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 49.89) (2 x 3.142 x 300)

Re =

2.646404

Re =

12.67

ln

X

4x

l d

ln

4

1 Rn-1

+

300 10

X

4.787

The resistance of the earth electrode

Re =

12.67

ohms

The overall earth resistance of Electrodes:-

1 = R 1 = R

1 R1

+ 1

12.67

1 -----R2

1 12.67

+

1 Rn 1

+

---------------------

12.67

1 Rn

Finally we calculate as Add no. of pits

2

n

the Combined value of

n pits

R18 =

R1- Total Resistance of Earth Electrodes(pits)

(Re)

6.33

Ω

R2 - Total Earth Resistance of the buried Conductor

(Rg)

3.06

Ω

6.33

Ohms

Refer Annexure-VI 1 R 1 R

=

1 R1

+

1 6.33

=

2

1 R2 +

1 3.06

Hence the combined resistance of grid + Earth pits R


=

R

=

R18A

=

R1

x

R2

R1

+

R2

=

6.33 6.33

x +

3.06 3.06

19.39 9.40

2.06

Ohms

42 OF 42

TRANSFER STATION

4.00 CALCULATION FOR SIZING OF EARTH CONDUCTOR BASED ON LV SYSTEM

Minimum Cross sectional area required = A As per IEEE - 80 ,the minimum cross sectional area of the earthing conductor to withstand the Short circuit current is given by A If

= Is the cross-sectional area, in mm2; =

is the value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which can flow through the protective device (see IEC 60909-0);

t = is the operating time of the protective device for automatic disconnection in s; k

= is the factor dependent on the material of the protective conductor, the insulation and is the factor dependent on the material of the protective conductor, the insulation and

A

(If √ t) k

=

The factor of K is determine from the formula (Annex A - IEC - 60364-5-54)

k

Qc( + 200C) ρ20

=

ln

1+

θf - θi

 + θi

Qc(β + 20°C)

=

ρ20

The value of

k

80

=

k

=

k

=

80

for steel as per ,Table A.54.1 of IEC 60364-5-54

x

ln

1+

500 202

+

45 45

=

80

x

1.045

81.76

Therefore ,the area of conductor for the maximum fault level of 40A and consider the fault clearing time is < 0.5 sec.the conductor area is

50000 A

=

A

=

X

1

81.76 Considering 15% corrosion allowance of the strip will be

612

Sq.mm

Hence the calculated minimum diameter of the MS Rod

A

=

D

=

D

=

D

=

A

=

703.26

Sq.mm

Hence the calculated minimum width & Thickness of the Earthing strip

∏D²/4

Earthing Conductor(strip) width

=

Earthing Conductor(strip) Thickness

=

70 X 10

mm mm

Ax4 П 612 x 3.142 28

4

Hence ,1R x 75 x10Sqmm GI.strip shall be used for main earthing grid as per NIT

mm

Considering 15% corrosion allowance the diameter of the GI pipe will be 32mm. However we will select a standard size of 100mm GI pipe for the main earth mat below ground as per contract specifications

D =

100Ø mm

Conculation:5.00

from the above calculations,we concluded that the required size of main earthing conductor for LV system is higher than that of HV(11kv system) Hence the size of earth conductor of main grid is selected based on LV system earthing calculation

6.00

The conductor selected for main earth is 1 Run of 75 x 10mm GI flat as per NIT. The earthing Electrode selected for earth pit is 100mm dia & 3mtr.as per NIT


7 OF 42

MAIN CONDUCTOR SIZING

SS-1-ELECTRICAL SUBSTATION GROUNDING CALCULATION

ANNEXURE-I REFERENCE IEC:60364-5-54 IS:3043

=



Vs

1.01 System nominal voltage The value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which 1.02 can flow through the protective device (see IEC 60909-0);

If

= =

415

V

50

kA


ts

=

1


tsc

=

1

LxB

=


A

=

551.8


ρ

=

70.53


Ta

=

45

°C

1.05 Length and breadth of the earth grid around Substation

15.5

sec sec x

35.6 m

m

2

Ω-m

2

2.00 Buried earth conductor (strip) 2.01 Length of burial of Earthing Strip

L

=

10220.0

cm

2.02 Depth of burial of conductor (Strip)

ω

=

80

cm

2.03 Width (Incase of strip) of the conductor (Strip)

t

=

7.50

cm

G.I.Pipe

3.00 Earth conductor (Rod or Pipe)

Pipe

=


l

=

3

Mtr


d

=

100

mm


2

Resistance of Buried earth conductor (Strip) The resistance of earth grid can be calculated by using the formula As per IS:3043 clause no.9.2.3


Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 70.53) (2 x 3.142 x 10220)

Rg =

0.109821

Rg =

1.40

ln

X

( 2 x L² ) (ωx t) ln

(2 x 104448400) (80 x 7.5)

12.760


Rg =


1.40

ohms

2

8 OF 42

SS-1





Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 70.53) (2 x 3.142 x 300)

Re =

3.741248

Re =

17.91

ln

X

4x

l d

ln

4

1 Rn-1

+

300 10

X

4.787


2

Re =

17.91

ohms


1 = R 1 = R

1 R1

+ 1

17.91

1 -----R2

1 17.91

+

1 Rn 1

+

---------------------

17.91

1 Rn


22

Add no. of pits n

the Combined value of n pits

R1

=

0.81

Ohms

2

add all transformer body&neutral earth pit


(Re)

0.81

Ω


(Rg)

1.40

Ω

Refer Annexure-I 1 R 1 R

=

1 R1

+

1 0.81

=

1 R2 +

1 1.40


R

=

=

R1A =


R1

x

R2

R1

+

R2

=

0.81 0.81

x +

1.40 1.40

1.14 2.22

0.51

Ohms

2

9 OF 42

SS-1


ANNEXURE-X REFERENCE IEC:60364-5-54 IS:3043

=



SYSTEM DATA Vs

1.01 System nominal voltage 1.02

The value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which can flow through the protective device (see IEC 60909-0);


If

= =

ts

=

415

V

50

kA

1

sec

tsc

=

LxB

=

A

=

551.8


ρ

=

25.05


Ta

=

45

°C


L

=

10220.0

cm


ω

=

80

cm


t

=

7.50

cm

G.I.Pipe

1.04 Fault clearing time 1.05 Length and breadth of the earth grid around Substation 1.06 Area of earth grid around Substation

2.00

2.04

1 15.5

sec x

35.6

m

m2

Ω-m


2


=


l

=

3

Mtr.


d

=

100

mm


Resistance of Buried earth conductor (Strip) The resistance of earth grid can be calculated by using the formula As p per IS:3043 clause no.9.2.3


Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 25.05) (2 x 3.142 x 10220)

Rg =

0.039005

Rg =

0.50

ln

X

( 2 x L² ) (ωx t) ln

(2 x 104448400) (80 x 7.5)

12.760


Rg =


0.50

ohms

10 OF 42

SS-2





Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 25.05) (2 x 3.142 x 300)

Re =

1.328771

Re =

6.36

ln

X

4x

l d

ln

4

1 Rn-1

+

300 10

X

4.787


Re =

6.36

ohms


1 = R

1 R1

+ 1

1 = R

6.36

1 -----R2

1 6.36

+

1 Rn 1

+

---------------------

6.36


1 Rn

2

22

n


n pits

R10 =

0.29

Ohms

add all transformer body&neutral earth pit R1- Total Resistance of Earth Electrodes(pits)

(Re)

0.29

Ω


(Rg)

0.50

Ω

Refer Annexure-X 1 R 1 R

=

1 R1

+

1 0.29

=

2

1 R2 +

1 0.50


R

=

=

R10A =


R1

x

R2

R1

+

R2

=

0.29 0.29

x +

0.50 0.50

0.14 0.79

0.18

Ohms

2

11 OF 42

SS-2


ANNEXURE-II REFERENCE IEC:60364-5-54 IS:3043

=



SYSTEM DATA Vs

1.01 System nominal voltage

= =

The value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which 1.02 can flow through the protective device (see IEC 60909-0);

If


ts

=

415

V

50

kA

1

sec

tsc

=

LxB

=

A

=

102.8625


ρ

=

25.05


Ta

=

45

°C


L

=

4465.0

cm


ω

=

80

cm


t

=

7.50

cm


2.00

2.04

1 6.5

sec x

15.83 m m2

Ω-m



=

G.I.Pipe


l

=

3

Mtr


d

=

100

mm


2



Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 25.05) (2 x 3.142 x 4465)

Rg =

0.089279

Rg =

0.99

ln

X

( 2 x L² ) (ωx t) ln

(2 x 19936225) (80 x 7.5)

11.104


Rg =


0.99

ohms

12 OF 42

SS-3

Resistance of earth Electrode (Steel Rod Or Pipe)

As per IS:3043 clause no.9.2.2 l




Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 25.05) (2 x 3.142 x 300)

Re =

1.328771

Re =

6.36

ln

X

4x

l d

ln

4

1 Rn-1

+

X

300 10

4.787


Re =

6.36

ohms


1 = R

1 R1

+ 1

1 = R

1 -----R2

1 6.36

+

6.36

1 Rn 1

+

---------------------

6.36

1 Rn


7

n


n pits - (RA)

=

0.91

Ohms

Add Pump House-2 earth pit

RA- Total Resistance of Earth Electrodes(pits) of SS-3

(Re)

0.91

Ω

RB- Total Resistance of Earth Electrodes(pits) of Pump House-2

(Re)

8 30 8.30

Ω

1 R

=

1 R

=

1 R1

+

1 0.91

Refer Annexure-II

2

1 R2 +

1 8.30


R

=

=

R2 =


R1

x

R2

R1

+

R2

=

0.91 0.91

x +

8.30 8.30

7.54 9.21

0.82

Ohms

2

13 OF 42

SS-3

TRANSFER HOUSE (TH-1) GROUNDING CALCULATION

ANNEXURE-XI REFERENCE IEC:60364-5-54 IS:3043

=



Vs



1.03 The operating time of the protective device for automatic disconnection in s; 1.04 Fault clearing time 1.05 Length and breadth of the earth grid around Substation

If

= =

ts

=

tsc

=

LxB

=

415

V

50

kA

1

sec

1 11

sec x

8


A

=

88


ρ

=

72.64


Ta

=

45

°C


L

=

3800.0

cm


ω

=

80

cm


t

=

7.50

cm

Pipe

=

G.I.Pipe


l

=

3

Mtr.


d

=

100

mm

m

m

2

Ω-m

2.00 Buried earth conductor (strip)

2

2.04 Earth conductor (Rod or Pipe) 2.05 Earth Electrode Material (Rod or Pipe)

2



Rg

=

( 100 x ρ ) ( 2 x ∏ x L)

ln

Rg =

(100 x 72.64) (2 x 3.142 x 3800)

Rg =

0.304198

Rg =

3.28

X

( 2 x L² ) (ωx t) ln

(2 x 14440000) (80 x 7.5)

10.782


2


Rg =

3.28

ohms

14 OF 42

TH-1





Re

=

( 100 x ρ ) ( 2 x ∏ x l)

Re

=

(100 x 72.64) (2 x 3.142 x 300)

Re

=

3.853172

Re

=

18.45

ln

X

4x

l d

ln

4

1 Rn-1

+

X

300 10

4.787


Re =

18.45

ohms

The Earth resistance with numbers of Electrodes:-

1 = R 1 = R

1 R1

+ 1

18.45

1 -----R2

1 18.45

+

1 Rn 1

+

---------------------

18.45

1 Rn


4

Add no. of pits n


R11 =


(Re)

4.61

Ω


(Rg)

3.28

Ω

4.61

Ohms

Refer Annexure-XI 1 R 1 R

=

1 R1

+

1 4.61

=

2

1 R2 +

1 3.28


R

2


=

=

R11A =

R1

x

R2

R1

+

R2

=

4.61 4.61

x +

3.28 3.28

15.13 7.89

4.61

Ohms

15 OF 42

TH-1


ANNEXURE-IV REFERENCE IEC:60364-5-54 IS:3043

=



Vs




If

= =

ts

=

415

V

50

kA

1

sec

tsc

=

LxB

=

13.7

A

=

147.275


ρ

=

151.39


Ta

=

45

°C


L

=

4890.0

cm


ω

=

80

cm


t

=

7.50

cm

Pipe

=

G.I.Pipe


l

=

3

Mtr.


d

=

100

mm


1

sec x

10.75 m m2

Ω-m


2


2



Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 151.39) (2 x 3.142 x 4890)

Rg =

0.492666

Rg =

5.56

ln

X

( 2 x L² ) (ωx t) ln

(2 x 23912100) (80 x 7.5)

11.286


2


Rg =

5.56

ohms

16 OF 42

TH-2





Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 151.39) (2 x 3.142 x 300)

Re =

8.030448

Re =

38.45

ln

X

4x

l d

ln

4

1 Rn-1

+

300 10

X

4.787


Re =

38.45

ohms


1 = R 1 = R

1 R1

+ 1

38.45

1 -----R2

1 38.45

+

1 Rn 1

+

---------------------

38.45

1 Rn


4

Add no. of pits n


R4


(Re)

9.61

Ω


(Rg)

5.56

Ω

=

9.61

Ohms

Refer Annexure-IV 1 R 1 R

=

1 R1

+

1 9.61

=

2

1 R2 +

1 5.56


R

2


=

=

R4A =

R1

x

R2

R1

+

R2

=

9.61 9.61

x +

5.56 5.56

53.44 15.17

3.52

Ohms

17 OF 42

TH-2

TRANSFER HOUSE (TH-2A) GROUNDING CALCULATION

ANNEXURE-XIII REFERENCE IEC:60364-5-54 IS:3043

=



Vs




If

=

415

V

50

kA

1

sec

=

ts

=

tsc

=

LxB

=

1 9

sec x

7.5


A

=

67.5


ρ

=

151.39


Ta

=

45

°C

m

m

2

Ω-m


L

=

3300.0

cm


ω

=

80

cm


t

=

7.50

cm

Pipe

=

G.I.Pipe


l

=

3

Mtr.


d

=

100

mm

2


2



Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 151.39) (2 x 3.142 x 3300)

Rg =

0.730041

Rg =

7.67

ln

X

( 2 x L² ) (ωx t) ln

(2 x 10890000) (80 x 7.5)

10.500


2


Rg =

7.67

ohms

18 OF 42

TH-2A





Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 151.39) (2 x 3.142 x 300)

Re =

8.030448

Re =

38.45

ln

X

4x

l d

ln

4

1 Rn-1

+

X

300 10

4.787


Re =

38.45

ohms


1 = R 1 = R

1 R1

+ 1

38.45

1 -----R2

1 38.45

+

1 Rn 1

+

---------------------

38.45

1 Rn


4

Add no. of pits n


R13 =


(Re)

9.61

Ω


(Rg)

7.67

Ω

9.61

Ohms

2

Refer Annexure-XIII 1 R 1 R

=

1 R1

+

1 9.61

=

2

1 R2 +

1 7.67


R

2


=

=

R13A =

R1

x

R2

R1

+

R2

=

9.61 9.61

x +

7.67 7.67

73.67 17.28

4.26

Ohms

19 OF 42

TH-2A

SILO BUILDING GROUNDING CALCULATION

ANNEXURE-III REFERENCE IEC:60364-5-54 IS:3043

=



Vs




If

= =

ts

=

tsc

=

LxB

=

415

V

50

kA

1

sec

1 11

sec x

9.6


A

=

105.6


ρ

=

151.39


Ta

=

45

°C

m

m

2

Ω-m


L

=

4120.0

cm


ω

=

80

cm


t

=

7.50

cm

Pipe

=

G.I.Pipe


l

=

3

Mtr.


d

=

100

mm

2


2



Rg

=

( 100 x ρ ) ( 2 x ∏ x L)

Rg

=

(100 x 151.39) (2 x 3.142 x 4120)

Rg

=

0.584741

Rg

=

6.40

ln

X

( 2 x L² ) (ωx t) ln

(2 x 16974400) (80 x 7.5)

10.943


2


Rg

=

6.40

ohms

20 OF 42

SILO BUILDING





Re

=

( 100 x ρ ) ( 2 x ∏ x l)

Re

=

(100 x 151.39) (2 x 3.142 x 300)

Re

=

8.030448

Re

=

38.45

ln

X

4x

l d

ln

4

300 10

X

4.787


Re

=

38.45

ohms

2


1 R

=

1 R

=

1 R1

+ 1

38.45

1 -----R2

1 Rn-1

1 38.45

+

1 Rn

+

1

+

---------------------

38.45

1 Rn


4

Add no. of electrode per pits


R3


(Re)

9.6

Ω


(Rg)

6.40

Ω

=

9.61

Ohms

Refer Annexure-III 1 R

= 1

R

1 R1

+

1 9.61

=

2

1 R2 +

1 6.40


R

2


=

=

R3A =

R1

x

R2

R1

+

R2

=

9.61 9.61

x +

6.40 6.40

61.50 16.01

3.84

Ohms

21 OF 42

SILO BUILDING

TAIL DRIVE HOUSE GROUNDING CALCULATION

ANNEXURE-XII REFERENCE IEC:60364-5-54 IS:3043

=



Vs




If

= =

ts

=

tsc

=

LxB

=

415

V

50

kA

1

sec

1 20.5

sec x

16.5


A

=

338.25


ρ

=

151.39


Ta

=

45

°C


L

=

7400.0

cm


ω

=

80

cm


t

=

7.5

cm

Pipe

=

G.I.Pipe


l

=

3

Mtr.


d

=

100

mm

m

m

2

Ω-m



2



Rg

=

( 100 x ρ ) ( 2 x ∏ x L)

ln

Rg =

(100 x 151.39) (2 x 3.142 x 7400)

Rg =

0.325559

Rg =

3.94

X

( 2 x L² ) (ωx t) ln

(2 x 54760000) (80 x 7.5)

12.115


Rg =


3.94

ohms

22 OF 42

TRAVEL DRIVE HOUSE





Re

=

( 100 x ρ ) ( 2 x ∏ x l)

Re

=

(100 x 151.39) (2 x 3.142 x 300)

Re

=

8.030448

Re

=

38.45

ln

X

4x

l d

ln

4

X

300 10

4.787


Re =

38.45

ohms

2


1 = R 1 = R

1 R1

+ 1

38.45

1 -----R2

1 Rn-1

1 38.45

+

1 Rn

+

1

+

---------------------

38.45

1 Rn


4

Add no. of pits n


R12 =


(Re)

9.61

Ω


(Rg)

3.94

Ω

9.61

Ohms

Refer Annexure-XII 1 R 1 R

=

1 R1

+

1 9.61

=

2

1 R2 +

1 3.94


R

=

=

R12A =


R1

x

R2

R1

+

R2

=

9.61 9.61

x +

3.94 3.94

37.91 13.56

2.80

Ohms

23 OF 42

TRAVEL DRIVE HOUSE

PARKING STATION-1 GROUNDING CALCULATION

ANNEXURE-V REFERENCE IEC:60364-5-54 IS:3043

=



Vs




If

= =

ts

=

tsc

=

LxB

=

415

V

50

kA

1

sec

1 10

sec x

12


A

=

120


ρ

=

151.39


Ta

=

45

°C

m

m

2

Ω-m


L

=

4400.0

cm


ω

=

80

cm


t

=

7.50

cm

Pipe

=

G.I.Pipe


l

=

3

Mtr.


d

=

100

mm

2


2



Rg

=

( 100 x ρ ) ( 2 x ∏ x L)

Rg

=

(100 x 151.39) (2 x 3.142 x 4400)

Rg

=

0.547531

Rg

=

6.06

ln

X

( 2 x L² ) (ωx t) ln

(2 x 19360000) (80 x 7.5)

11.075


2


Rg =

6.06

ohms

24 OF 42

PARKING STATION-1





Re

=

( 100 x ρ ) ( 2 x ∏ x l)

Re

=

(100 x 151.39) (2 x 3.142 x 300)

Re

=

8.030448

Re

=

38.45

ln

X

4x

l d

ln

4

1 Rn-1

+

X

300 10

4.787


Re

=

38.45

ohms


1 = R 1 = R

1 R1

+ 1

38.45

1 -----R2

1 38.45

+

1 Rn 1

+

---------------------

38.45

1 Rn


4

Add no. of pits n


R5


(Re)

9.61

Ω


(Rg)

6.06

Ω

=

9.61

Ohms

Refer Annexure-V 1 R

= 1

R

1 R1

+

1 9.61

=

2

2

1 R2 +

1 6.06


R

2


=

=

R5A =

R1

x

R2

R1

+

R2

=

9.61 9.61

x +

6.06 6.06

58.28 15.68

3.72

Ohms

25 OF 42

PARKING STATION-1

PARKING STATION-2 GROUNDING CALCULATION

ANNEXURE-XIV REFERENCE IEC:60364-5-54 IS:3043

=



Vs




If

= =

ts

=

tsc

=

LxB

=

415

V

50

kA

1

sec

1 10

sec x

12


A

=

120


ρ

=

35.1


Ta

=

45

°C

m

m

2

Ω-m


L

=

4400.0

cm


ω

=

80

cm


t

=

7.50

cm

Pipe

=

G.I.Pipe


l

=

3

Mtr.


d

=

100

mm

2


2



Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 35.1) (2 x 3.142 x 4400)

Rg =

0.126946

Rg =

1.41

ln

X

( 2 x L² ) (ωx t) ln

(2 x 19360000) (80 x 7.5)

11.075


Rg =


1.41

ohms

26 OF 42

PARKING STATION-2





Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 35.1) (2 x 3.142 x 300)

Re =

1.861871

Re =

8.91

ln

X

4x

l d

ln

4

300 10

X

4.787


Re =

8.91

ohms

2


1 = R

1 R1

+ 1

1 = R

1 -----R2

1 8.91

+

8.91

1 Rn-1

1 Rn

+

1

+

---------------------

8.91

1 Rn


2

Add no. of pits n


R14


(Re)

4.46

Ω


(Rg)

1.41

Ω

=

4.46

Ohms

Refer Annexure-XIV 1 R 1 R

=

1 R1

+

1 4.46

=

2

1 R2 +

1 1.41


R

2


=

=

R14A =

R1

x

R2

R1

+

R2

=

4.46 4.46

x +

1.41 1.41

6.27 5.86

1.07

Ohms

27 OF 42

PARKING STATION-2


ANNEXURE-VI REFERENCE IEC:60364-5-54 IS:3043

=



Vs




If

= =

ts

=

tsc

=

LxB

=

415

V

50

kA

1

sec

1 10.265

sec x

9.5


A

=

97.5175


ρ

=

35.1


Ta

=

45

°C


L

=

3953.0

cm


ω

=

80

cm


t

=

7.50

cm

Pipe

=

G.I.Pipe


l

=

3

Mtr.


d

=

100

mm

m

m

2

Ω-m


2


2



Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 35.1) (2 x 3.142 x 3953)

Rg =

0.141301

Rg =

1.53

ln

X

( 2 x L² ) (ωx t) ln

(2 x 15626209) (80 x 7.5)

10.861


2


Rg =

1.53

ohms

28 OF 42

TH-3





Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 35.1) (2 x 3.142 x 300)

Re =

1.861871

Re =

8.91

ln

X

4x

l d

ln

4

1 Rn-1

+

300 10

X

4.787


Re =

8.91

ohms


1 = R

1 R1

+ 1

1 = R

1 -----R2

1 8.91

+

8.91

1 Rn 1

+

---------------------

8.91

1 Rn


4

Add no. of pits n


R6


(Re)

2.23

Ω


(Rg)

1.53

Ω

=

2.23

Ohms

Refer Annexure-VI 1 R 1 R

=

1 R1

+

1 2.23

=

2

1 R2 +

1 1.53


R

2


=

=

R6A =

R1

x

R2

R1

+

R2

=

2.23 2.23

x +

1.53 1.53

3.42 3.76

0.91

Ohms

29 OF 42

TH-3


ANNEXURE-VII REFERENCE IEC:60364-5-54 IS:3043

=



Vs




If

= =

415

V

50

kA

1

sec

ts

=

tsc

=

1

LxB

=

16.95

sec x

12.5


A

=

211.875


ρ

=

41.94


Ta

=

45

°C


L

=

5890.0

cm


ω

=

80

cm


t

=

7.50

cm

Pipe

=

G.I.Pipe


l

=

3

cm


d

=

100

cm

m

m

2

Ω-m


2


2



Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 41.94) (2 x 3.142 x 5890)

Rg =

0.113312

Rg =

1.32

ln

X

( 2 x L² ) (ωx t) ln

(2 x 34692100) (80 x 7.5)

11.658


2


Rg =

1.32

ohms

30 OF 42

TH-5





Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 41.94) (2 x 3.142 x 300)

Re =

2.224698

Re =

10.65

ln

X

4x

l d

ln

4

1 Rn-1

+

X

300 10

4.787


Re =

10.65

ohms


1 = R 1 = R

1 R1

+ 1

10.65

1 -----R2

1 10.65

+

1 Rn 1

+

---------------------

10.65

1 Rn


4

Add no. of pits n


R7

=

2.66

Ohms

Note:- Refer the Earthing Pit & Strip Scheme for overall plant.


(Re)

2.66

Ω

R2 - Total T t lE Earth th R Resistance i t off the th buried b i d Conductor C d t

(R ) (Rg)

1 32 1.32

Ω

Refer Annexure-VII 1 R 1 R

=

1 R1

+

1 2.66

=

2

1 R2 +

1 1.32


R

2


=

=

R7A =

R1

x

R2

R1

+

R2

=

2.66 2.66

x +

1.32 1.32

3.52 3.98

0.88

Ohms

31 OF 42

TH-5


ANNEXURE-XVI REFERENCE IEC:60364-5-54 IS:3043

=



Vs




If

= =

415

V

50

kA

1

sec

ts

=

tsc

=

1

LxB

=

10.85

sec x

6.5


A

=

70.525


ρ

=

128.94


Ta

=

45

°C


L

=

3470.0

cm


ω

=

80

cm


t

=

7.50

cm

Pipe

=

G.I.Pipe


l

=

3

Mtr.


d

=

100

mm

m

m

2

Ω-m


2


2



Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 128.94) (2 x 3.142 x 3470)

Rg =

0.591319

Rg =

6.27

ln

X

( 2 x L² ) (ωx t) ln

(2 x 12040900) (80 x 7.5)

10.600


2


Rg =

6.27

ohms

32 OF 42

TH-6





Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 128.94) (2 x 3.142 x 300)

Re =

6.839593

Re =

32.74

ln

X

4x

l d

ln

4

1 Rn-1

+

300 10

X

4.787


Re =

32.74

ohms


1 = R 1 = R

1 R1

+ 1

32.74

1 -----R2

1 32.74

+

2

1 Rn 1

+

---------------------

32.74

1 Rn


4

Add no. of pits n


R16 =

8.19

Ohms



(Re)

8.19

Ω


(R ) (Rg)

6 27 6.27

Ω

Refer Annexure-XVI 1 R 1 R

=

1 R1

+

1 8.19

=

2

1 R2 +

1 6.27

Hence the combined resistance of grid + Earth pits R R

2


= =

R16A =

R1

x

R2

R1

+

R2

=

8.19 8.19

x +

6.27 6.27

51.31 14.45

3.55

Ohms

33 OF 42

TH-6

PUMP HOUSE-1 GROUNDING CALCULATION

ANNEXURE-VIII REFERENCE IEC:60364-5-54 IS:3043

=



Vs




If

= =

ts

=

tsc

=

LxB

=

415

V

50

kA

1

sec

1 11

sec x

6.5


A

=

71.5


ρ

=

205.51


Ta

=

45

°C


L

=

3500.0

cm


ω

=

80

cm


t

=

7.50

cm

Pipe

=

G.I.Pipe


l

=

3

Mtr.


d

=

100

mm

m

m

2

Ω-m


2


2



Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 205.51) (2 x 3.142 x 3500)

Rg =

0.934391

Rg =

9.92

ln

X

( 2 x L² ) (ωx t) ln

(2 x 12250000) (80 x 7.5)

10.617


2


Rg =

9.92

ohms

34 OF 42

PUMP HOUSE-1





Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 205.51) (2 x 3.142 x 300)

Re =

10.90123

Re =

52.19

ln

X

4x

l d

ln

4

1 Rn-1

+

X

300 10

4.787


Re =

52.19

ohms


1 = R 1 = R

1 R1

+ 1

52.19

1 -----R2

1 52.19

+

1 Rn 1

+

---------------------

52.19

1 Rn


5

Add no. of pits n


R8

=

10.44

Ohms



(Re)


(R ) (Rg)

10.44 Ω

Refer Annexure-VIII 1 R 1 R

=

=

1 R1

+

1 10.44

9 92 9.92

Ω

2

1 R2 +

1 9.92

Hence the combined resistance of grid + Earth pits R R

= =

R8A =


R1

x

R2

R1

+

R2

=

10.44 10.44

x +

9.92 9.92

103.55 20.36

5.09

Ohms

35 OF 42

PUMP HOUSE-1

PUMP HOUSE-2 GROUNDING CALCULATION

ANNEXURE-XVII REFERENCE IEC:60364-5-54 IS:3043

=



Vs




If

=

415

V

50

kA

1

sec

=

ts

=

tsc

=

LxB

=

1 9

sec x

7.5


A

=

67.5


ρ

=

228.68


Ta

=

45

°C


L

=

3300.0

cm


ω

=

80

cm


t

=

7.50

cm

Pipe

=

G.I.Pipe


l

=

3

Mtr.


d

=

100

mm

m

m

2

Ω-m


2


2



Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 228.68) (2 x 3.142 x 3300)

Rg =

1.102753

Rg =

11.58

ln

X

( 2 x L² ) (ωx t) ln

(2 x 10890000) (80 x 7.5)

10.500


2


Rg =

11.58

ohms

36 OF 42

PUMP HOUSE-2





Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 228.68) (2 x 3.142 x 300)

Re =

12.13028

Re =

58.07

ln

X

4x

l d

ln

4

1 Rn-1

+

X

300 10

4.787


2

Re =

58.07

ohms


1 = R 1 = R

1 R1

+ 1

58.07

1 -----R2

1 58.07

+

1 Rn 1

+

58.07

---------------------

1 Rn


7

Add no. of pits n

the Combined value of n pits (RB)


(Re)


(Rg)

8.30

=

8.30

Ohms

2

Ω

Refer Annexure-XVII 1 R 1 R

=

1 R1

+

1 8.30

=

11.58 Ω

2

1 R2 +

1 11.58


2


=

R

=

RB

=

R1

x

R2

R1

+

R2

=

8.30 8.30

x +

11.58 11.58

96.06 19.87

8.30

Ohms

37 OF 42

PUMP HOUSE-2

DHC AT NEAR AREA HTP-2 (TR-64) CALCULATION

ANNEXURE-IX REFERENCE IEC:60364-5-54 IS:3043

=



SYSTEM DATA Vs



If

= =

415

V

50

kA


ts

=

1

sec


tsc

=

1

sec

LxB

=

A

=

800

1.07 Resistivity of the soil at DHC HTP-2

ρ

=

70.15


Ta

=

45

°C


L

=

18000.0

cm


ω

=

80

cm

t

=

7.50

cm

1.05 Length and breadth of the earth grid around Substation 1.06 Area of earth grid around Substation

2.00

x

10 m2

Ω-m


2.03 Width (Incase of strip) of the conductor (Strip) 2.04

80


=

G.I.Pipe


l

=

3

Mtr.


d

=

100

mm


R i t Resistance off Buried B i d earth th conductor d t (Strip) (St i ) The resistance of earth grid can be calculated by using the formula As per IS:3043 clause no.9.2.3


Rg =

( 100 x ρ ) ( 2 x ∏ x L)

Rg =

(100 x 70.15) (2 x 3.142 x 18000)

Rg =

0.062018

Rg =

0.86

ln

X


Rg =

0.86

ohms

( 2 x L² ) (ωx t) ln

13.892

(2 x 324000000) (80 x 7.5)

m





Re =

( 100 x ρ ) ( 2 x ∏ x l)

Re =

(100 x 70.15) (2 x 3.142 x 300)

Re =

3.721091

Re =

17.81

4x

l d

ln

4

1 Rn-1

+

ln

X

300 10

X

4.787


Re =

17.81

ohms


1 = R

1 R1

+ 1

1 = R

17.81

1 -----R2

1 17.81

+

1 Rn 1

+

---------------------

17.81

1 Rn


20

n


n pits

=

0.89

Ohms


R1 Total R1T t lR Resistance i t off Earth E th Electrodes(pits) El t d ( it )

R1

(R ) (Re)

0 89 0.89

Ω


R2

(Rg)

0.86

Ω

Refer Annexure-IX 1 R 1 R

=

1 R1

+

1 0.89

=

1 R2 +

1 0.86


=

R

=

R3

=

R1

x

R2

R1

+

R2

0.89 0.89

=

x +

0.86 0.86

0.77 1.75

0.44

Ohms

Resistance of earth conductor (Strip) riser & DHC gantry strip at HTP-3 to HTP-6 The resistance of earth grid can be calculated by using the formula As per IS:3043 clause no.9.2.3

l = Length of the Strip (in m)

1950.0

=

A = Area of the earth conductor strip =

75

ρ = Resistivity of the GI conductor in Ω m

x

m 10

138 x 10-9

Rg = Resistance of the earth conductor

Rg =

Rg = Rg =

(lxρ) A (1950 x 138 x 10-9) -6 750 x 10 0.36


R4 =

0.359

ohms

750

Sqmm

R3- Total Resistance of Earth Electrodes(pits)+Grid Strip

R3 =

(Re)

0.44

Ω

R4 - Total Earth Resistance of the along the conveyor earth strip

R4 =

(Rg)

0.36

Ω

R

=

R3

+

R4

=

0.44

+

0.36

=

0.80

Hence the combined resistance of grid + Earth Strip

R9A =

0.80

Ohms

CLIENT CONSULTANT CONTRACTOR PROJECT: PACKAGEII : DOCUMENT NAME : DOCUMENT NO.

REV.

SIZING OF PLANT EARTHING CONDUCTOR SR.NO.

DESCRIPTION

A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Main Grid and Connectivity to Plant earthing Substation‐1 (SS‐1) Substation‐2 (SS‐2) S b t ti 3 (SS 3) Substation‐3 (SS‐3) Transfer House (TH‐1) Transfer House (TH‐2) Transfer House (TH‐2A) Silo Building Tail drive House Transfer House (TH‐3) Transfer House (TH‐4) Transfer House (TH‐5) Transfer House (TH‐6) Transfer House (TH 6) Parking station (PS‐1) Parking station (PS‐2) Along the conv‐718 gallary cable Tray Along the conv‐719 gallary cable Tray Along the conv‐721 gallary cable Tray Along the conv‐727 gallary cable Tray Along the conv‐727‐1 gallary cable Tray Along the conv‐727‐2 gallary cable Tray Along the conv‐723 gallary cable Tray

B 1 2

Transformer Transformer Body Earthing Transformer Neutral Earthing

C 1 2 D 1 1.1 1.2 1.3 1.4 1.5 1.6 1.8 19 1.9

SIZE OF NO. OF EARTH EARTHING CONNECTION CONDUCTOR (SQMM)

NO OF RUN PER CONDUCTOR TYPE REMARKS CONNECT ION

75 x 10 mm 75 x 10 mm 75 10 75 x 10 mm 75 x 10 mm 75 x 10 mm 75 x 10 mm 75 x 10 mm 75 x 10 mm 75 x 10 mm 75 x 10 mm 75 x 10 mm 75 x 10 mm 75 x 10 mm 75 x 10 mm 75 x 10 mm 50 x 6 mm 50 x 6 mm 50 x 6 mm 50 x 6 mm 50 x 6 mm 50 x 6 mm 50 x 6 mm

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

GI Flat GI Flat GI Fl t GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat

2 separate 2 separate

65 x 10 mm 65 x 10 mm

1 1

GI Flat GI Flat

HT Equipment 6.6kv HT panel at SS‐1 11kv HT panel at SS‐2

2 separate 2 separate

50 x 6 mm 50 x 6 mm

1 1

GI Flat GI Flat

LT E i LT Equipment t LT Power & Control Panels PMCC at SS‐1 PMCC at SS‐2 AC VENT MCC at SS‐1 AC VENT MCC at SS‐2 DFDS board at Pump House‐1 DFDS board at Pump House‐2 Hydraulic System Control Panels body earth Lubrication System Control Panels body earth Lubrication System Control Panels body earth

2 separate 2 separate 2 separate 2 separate 2 separate 2 separate 2 separate 2 separate 2 separate

60 x 10 mm 60 x 10 mm 60 x 10 mm 60 x 10 mm 60 x 10 mm 60 x 10 mm 25 x 6 mm 25 x 6 mm 25 x 6 mm

1 1 1 1 1 1 1 1

GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat


4 OF 42

PLANT CONCUCTOR

SR.NO.

SIZE OF NO. OF EARTH EARTHING CONNECTION CONDUCTOR (SQMM)

DESCRIPTION

2 2.1 2.2 2.3 2.4 2.5 2.6 2.7

LT Distribution Board Main Lighting Distribution Board Welding Distribution Board Auxiliary Power Distribution Board Lighting Distribution Board Field Power Distribution Board Local Push Buttons Board UPS ,UPS distribution Board Battery Charger & DCDB Battery Charger & DCDB

3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9

Electrical items 3 Phase Welding socket ‐Body earthing Exaust fan Lighting Fixture Celling Fan Socket 3 Pin Lighting JB Street Lighting pole Earthing g gp g Control Junction Box Power Junction Box

2 separate 2 separate 2 separate 2 separate 2 separate 2 separate 2 separate 2 separate 2 separate

50 x 6 mm 50 x 6 mm 50 x 6 mm 25 x 6 mm 25 x 6 mm 25 x 6 mm 25 x 6 mm 25 x 6 mm 25 x 6 mm

1 1 1 1 1 1 1 1

GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat GI Flat

2 separate

16Sqmm

1

Stranded GI wire

Same size as phase conductor

2 2 separate 2 separate p 2 separate 2 separate

E 1 2 3 4

LT Motors LT Motors up to 2.2kw LT Motors 3.7kw to 15kw LT Motors 15 kw to 45kw LT Motors above 45kw

2 separate 2 separate 2 separate 2 separate

F 1 2 3 4 5 6 7 8 9

Field Instrument Pull cord switches Belt Sway Switches Zero speed Switches Chute Jam Switches Belt Weigh Switch Slip Switches Monoral Hoist PJB for Motors CJB for Motors CJB for Motors

2 separate 2 separate 2 separate 2 separate 2 separate 2 separate 2 separate 2 separate 2 separate 2 separate


NO OF RUN PER CONDUCTOR TYPE REMARKS CONNECT ION

16 Sq.mm 16 Sq.mm q 6 Sq.mm 6 Sq.mm

1 1 1 1

GI Wire GI Wire Stranded GI wire Stranded GI wire

6 Sq.mm 16 Sq.mm 25 x 3 mm 50 x 6 mm

1 1 1 1

Stranded GI wire Stranded GI wire GI Flat GI Flat

1 1 1 1 1 1 1 1 1

Stranded GI wire Stranded GI wire Stranded GI wire Stranded GI wire Stranded GI wire Stranded GI wire GI Flat GI Flat Stranded GI wire Stranded GI wire

6 Sq.mm 6 Sq.mm 6 Sq.mm 6 Sq.mm 6 Sq.mm 6 Sq.mm 25 x 6 mm Same as Motor 6 Sq.mm 6 Sq mm

5 OF 42

PLANT CONCUCTOR

Total Earthing System

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