⎯
38
⎯
6 F 2 S 0 8 4 6
Setting of earth fault compensation factor (zero sequence compensation)
In order to correctly measure the positive-sequence impedance to the fault point, the current input
to the earth fault measuring elements is compensated by the residual current (3I0) of the protected
line in the case of a single circuit line and by residual current (3I0) of the protected line and
residual current (3I0’) of the parallel line in the case of a double circuit line.
Generally, the following equation is used to compensate the zero-sequence voltage drop in the
case of phase “a”.
Va = (Ia
−
I0)Z1 + I0
×
Z0 + Iom
×
Zom (1)
where,
Va: Phase “a” voltage
Ia: Phase “a” current
I0: Zero-sequence current of the protected line
I0m: Zero-sequence current of the parallel line
Z1: Positive-sequence impedance (Z1 = R1 + jX1)
Z0: Zero-sequence impedance (Z0 = R0 + jX0)
Z0m: Zero-sequence mutual impedance (Zom = Rom + jXom)
Equation (1) can be written as follows:
Va = (R1 + jX1)Ia +
{
(R0
−
R1) + j(X0
−
X1)
}
I0 + (Rom + jXom)Iom
=
R1(Ia +
R0
−
R1
R1
I0 +
Rom
R1
Iom) + jX1(Ia +
X0
−
X1
X1
I0 +
Xom
X1
Iom)
In the GRZ100, the voltage is compensated independently for resistance and reactance
components as shown in equation (2) in stead of general equation (1).
VaR + jVaX =
{
R1( IaR +
Krs
100
−
1
3
×
3I0R +
Krm
100
3
×
3IomR )
−
X1( IaX +
Kxs
100
−
1
3
×
3I0X +
Kxm
100
3
×
3IomX )
}
+ j
{
R1( IaX +
Krs
100
−
1
3
×
3I0X +
Krm
100
3
×
3IomX )
+ X1( IaR +
Kxs
100
−
1
3
×
3I0R +
Kxm
100
3
×
3IomR )
}
(2)
where,
Kxs: compensation factor (Kxs = X0/X1
×
100)
Krs: compensation factor (Krs = R0/R1
×
100)
Kxm: compensation factor (Kxm = Xom/X1
×
100)
Krm: compensation factor (Krm = Rom/R1
×
100)
X: imaginary part of the measured impedance
R: real part of the measured impedance
Содержание GRZ100 B Series
Страница 264: ... 263 6 F 2 S 0 8 4 6 Appendix A Block Diagram ...
Страница 271: ... 270 6 F 2 S 0 8 4 6 ...
Страница 272: ... 271 6 F 2 S 0 8 4 6 Appendix B Signal List ...
Страница 307: ... 306 6 F 2 S 0 8 4 6 ...
Страница 308: ... 307 6 F 2 S 0 8 4 6 Appendix C Variable Timer List ...
Страница 310: ... 309 6 F 2 S 0 8 4 6 Appendix D Binary Input Output Default Setting List ...
Страница 321: ... 320 6 F 2 S 0 8 4 6 ...
Страница 322: ... 321 6 F 2 S 0 8 4 6 Appendix E Details of Relay Menu and LCD Button Operation ...
Страница 331: ... 330 6 F 2 S 0 8 4 6 ...
Страница 340: ... 339 6 F 2 S 0 8 4 6 Appendix G Typical External Connections ...
Страница 377: ... 376 6 F 2 S 0 8 4 6 ...
Страница 384: ... 383 6 F 2 S 0 8 4 6 Appendix J Return Repair Form ...
Страница 388: ... 387 6 F 2 S 0 8 4 6 Customer Name Company Name Address Telephone No Facsimile No Signature ...
Страница 389: ... 388 6 F 2 S 0 8 4 6 ...
Страница 390: ... 389 6 F 2 S 0 8 4 6 Appendix K Technical Data ...
Страница 401: ... 400 6 F 2 S 0 8 4 6 ...
Страница 402: ... 401 6 F 2 S 0 8 4 6 Appendix L Symbols Used in Scheme Logic ...
Страница 405: ... 404 6 F 2 S 0 8 4 6 ...
Страница 406: ... 405 6 F 2 S 0 8 4 6 Appendix M Example of Setting Calculation ...
Страница 417: ... 416 6 F 2 S 0 8 4 6 ...
Страница 418: ... 417 6 F 2 S 0 8 4 6 Appendix N IEC60870 5 103 Interoperability and Troubleshooting ...
Страница 430: ... 429 6 F 2 S 0 8 4 6 Appendix O Programmable Reset Characteristics and Implementation of Thermal Model to IEC60255 8 ...
Страница 434: ... 433 6 F 2 S 0 8 4 6 Appendix P Inverse Time Characteristics ...
Страница 437: ... 436 6 F 2 S 0 8 4 6 ...
Страница 438: ... 437 6 F 2 S 0 8 4 6 Appendix Q Failed Module Tracing and Replacement ...
Страница 444: ... 443 6 F 2 S 0 8 4 6 Appendix R Ordering ...
Страница 447: ......