Descripción: ejemplo proteccion diferencial para transformador con cmc356
NiceFull description
Full description
Transformer Differential Relay Test Report of Siemens RelayFull description
Protection scheme required for the protection of power system components against abnormal conditions such as faults etc., and that essentially consists of protective relaying and circuit breaker. Protective relay senses the fault and determines the l
transformer
Descripción: power transformer
transformerFull description
makalah differentialDeskripsi lengkap
calculus explained with examplesDescripción completa
DIFFERENTIAL EQUATIONS
protection and switchgearFull description
Full description
TKRDeskripsi lengkap
DIFFERENTIAL-PROTECTION
Differential Equations by (Shepley L. Ross)Descripción completa
Full description
Differential Equations by (Shepley L. Ross)Full description
Differential
Differential Protection fr Motors and transfrmersFull description
dddd
Practice Improvement Cooperation Innovation
Transformer Differential Relay PCS-9671
NR Electric Co., Ltd.
Application Scheme • Protection scheme for transformer
PANEL 1
CB
PCS9671 PCS9611
PCS9611
CB www.nrelect.com
2
Hardware of PCS-9671 • Front View
PCS-9671 TRANSFORMER RELAY HEALTHY ALARM
ENT
www.nrelect.com
3
Hardware of PCS-9671 • Rear view of PCS-9671
www.nrelect.com
4
Hardware of PCS-9671 • Hardware structure
www.nrelect.com
5
Hardware of PCS-9671 • Power supply module Pin No.
Sign
Description
1
SIG_COM
Signal common output terminal
2
BO_Fail_Device
Failure signal output
3
BO_Alm_Device
Alarming signal output
BO_Prot_01
The No.1 programmable tripping and closing binary output. It is also a self-latched output contact.
BO_Prot_02
The No.2 programmable tripping and closing binary output. It is also a self-latched output contact.
BO_01
The No.3 programmable tripping and closing binary output.
BO_02
The No.4 programmable tripping and closing binary output.
BO_03
The No.5 programmable tripping and closing binary output.
BO_04
The No.6 programmable tripping and closing binary output.
BO_05
The No.7 programmable tripping and closing binary output.
BO_06
The No.8 programmable tripping and closing binary output.
20
PSW+
DC power supply positive input
21
PSW-
DC power supply negative input
22
GND
Grounded terminal
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
www.nrelect.com
6
Hardware of PCS-9671 • CPU module
www.nrelect.com
7
Hardware of PCS-9671 • AI module (4I4U) slot 4 CT High-value analog inputs
4422
LPF
Low-value analog outputs
301
302
303
304
305
306
307
308
309
310
311
312
301
Ia-S1-1A
310
Icn-S1-1A
319
Ub
313
314
302
Ian-S1-1A
311
Ic-S1-5A
320
Ubn
315
316
317
318
303
Ia-S1-5A
312
Icn-S1-5A
321
Uc
319
320
304
Ian-S1-5A
313
I0-S1-1A
322
Ucn
321
322
323
324
305
Ib-S1-1A
314
I0n-S1-1A
323
U0
306
Ibn-S1-1A
315
I0-S1-5A
324
U0n
307
Ib-S1-5A
316
I0n-S1-5A
308
Ibn-S1-5A
317
Ua
309
Ic-S1-1A
318
Uan
VT No.
Description
No.
Description
No.
Description
www.nrelect.com
8
Hardware of PCS-9671 • AI module (4I4U) slot 2 CT High-value analog inputs
4422
LPF
Low-value analog outputs
301
302
303
304
305
306
307
308
309
310
311
312
301
Ia-S2-1A
310
Icn-S2-1A
319
Not used
313
314
302
Ian-S2-1A
311
Ic-S2-5A
320
Not used
315
316
317
318
303
Ia-S2-5A
312
Icn-S2-5A
321
Not used
319
320
304
Ian-S2-5A
313
I0-S2-1A
322
Not used
321
322
323
324
305
Ib-S2-1A
314
I0n-S2-1A
323
Not used
306
Ibn-S2-1A
315
I0-S2-5A
324
Not used
307
Ib-S2-5A
316
I0n-S2-5A
308
Ibn-S2-5A
317
Not used
309
Ic-S2-1A
318
Not used
VT No.
Description
No.
Description
No.
Description
www.nrelect.com
9
Hardware of PCS-9671 • BO module
Tripping output
Signals from CPU Module
Driver Circuit
Control output
Signal output
www.nrelect.com
10
Hardware of PCS-9671 • BI module
Binary inputs
OPT
To CPU Module
www.nrelect.com
11
Hardware of PCS-9671 • XXX.OutMap: 0~0xFFF Bit No.
Corresponding Binary Output
Trip Output
0
B09.BO_01
BO_Trp01
1
B09.BO_02
BO_Trp02
2
B09.BO_03
BO_Trp03
3
B09.BO_04
BO_Trp04
4
B09.BO_05
BO_Trp05
5
B09.BO_06
BO_Trp06
6
B06.BO_01
BO_Trp07
7
B06.BO_02
BO_Trp08
8
B06.BO_03
BO_Trp09
9
B06.BO_04
BO_Trp10
10
B06.BO_05
BO_Trp11
11
B06.BO_06
BO_Trp12
www.nrelect.com
12
Protection Theory • Fundamentals of differential protection
www.nrelect.com
13
Protection Theory • Fundamentals of differential protection
www.nrelect.com
14
Protection Theory • Phase shift compensation Y–>∆ compensation method I AY ( I A I B ) / 3 I BY ( I B I C ) / 3 I CY ( I C I A ) / 3
I a I a I b I b I I c c
www.nrelect.com
15
Protection Theory • Calculate rated secondary current of each side
Ie •
Example:
S n CT2 n 3 U n CT1n
A 150/20kV Yn/d11 two-winding transformer, Sn=40MVA, CT ratio of 150kV side: 300/5, CT ratio of 20kV side: 3000/5A, calculate the rated secondary current , if load current of HV side is 120A, find the displayed per unit value of HV side. Rated secondary current of 150kV side:
I eH
40000 5 2.57 A 3 150 300
120 5 IH 0.79 I e 2.57 300
Rated secondary current of 20kV side:
40000 5 I eL 1.92 A 3 20 3000
www.nrelect.com
16
Protection Theory • Sensitive percentage differential protection I d Ibiased I r 0.5I e 0.5I e I r 3I e I d Kbl ( I r -0.5I e ) I cdqd I r 3I e I d ( I r -3I e ) Kbl 2.5I e I cdqd
Protection Theory • Unrestrained instantaneous differential protection
I d Iins tan t •
where
Id
m
I i 1
i
-
Accelerate the trip when a serious inner fault occurs
-
The setting should be greater than maximum inrush current
-
Without any block element
www.nrelect.com
19
Protection Theory • Operation characteristic curve of current differential protection
www.nrelect.com
20
Protection Theory
21
- Inrush current
Energizing test without inner fault （real 500kV transformer)
www.nrelect.com
21
Protection Theory
22
• Characteristic of inrush current -
Consist of DC component
-
Waveform is distorted
-
Consist of plentiful harmonics
-
declayed with time
www.nrelect.com
22
Protection Theory • Inrush current detection
I d _ 2 nd [87T .K _ Hm2] I d _1st I d _ 3rd [87T .K _ Hm3] I d _1st
www.nrelect.com
23
Protection Theory
24
• Blocking mode -
Cross blocking mode
-
Composite blocking mode
www.nrelect.com
24
Protection Theory
25
• CT saturation
A 相(A)
100 0
B 相(A)
-100 -40 100
0
20
40
60
80
100
120
-20
0
20
40
60
80
100
120
-20
0
20
40 t (ms)
60
80
100
120
0 -100 -40 100
C 相(A)
-20
0 -100 -40
www.nrelect.com
25
Protection Theory
26
• CT saturation detection
I d _ 2 nd k sat _ 2 nd I d _1st I d _ 3rd ksat _ 3rd I d _1st
www.nrelect.com
26
Protection Theory
27
• Over-excitation detection
I d _ 5 th > k 5 xb × I d _ 1st When voltage increases or frequency decreases will cause over excitation If voltage reaches to 120%-140% of rated voltage, the excitation current can reach to 10%-43% of rated current
www.nrelect.com
27
Protection Theory -
28
CT circuit failure discrimination CT circuit failure discrimination will be enabled after FD of differential protection picking up. Any one of following three criteria is satisfied after FD of percentage differential protection pickup, CT circuit failure discrimination will not be carried out.
a)
Maximum phase current of one side is lower than 0.2Ie before FD pickup. When this occurs, only CT circuit failure discrimination of this side will not be carried out.
b)
The maximum phase current is high than 1.2Ie after FD pickup
c)
Any phase current of any side after pickup increases than before FD pickup
