© The Institution of Engineering and Technology
Based on the ratio between the sum of two terminal-voltage phasors of the transmission line and that of two terminal-current phasors of the same line, which is defined as integrated impedance in this study, a novel transmission line pilot protection principle is proposed. When an external fault of the transmission line occurs, the imaginary part of the integrated impedance which reflects the capacitance impedance of the line is negative and with a great modulus. When an internal fault of the transmission line occurs, the imaginary part of the integrated impedance of faulty phase which generally reflects the impedance of the system source and the line is either positive or negative and with a relatively small modulus. According to such a characteristic, the external fault and the internal fault of transmission line can be distinguished. The criterion proposed in this study is not affected by the capacitive current. It can be applied to the line with or without shunt reactor. Moreover, the threshold of the criterion can be easily set. Simulation results of electro-magnetic transient program (EMTP) and dynamic physical test data both verify the high sensitivity and reliability of the proposed principle.
References
-
-
1)
-
Min, Z., Xinzhou, D., Zhiqian, B.: `A new current differential protection scheme for two-terminal transmission lines', IEEE Power Engineering Society General Meeting, 2007, USA, p. 1–6.
-
2)
-
Jiali, H., Zheng, G.: `Novel principle of pilot differential relay protection of transmission lines', Fourth Int. Conf. on Power Transmission & Distribution Technology, 2003, China, p. 576–581.
-
3)
-
Yuan, R., Chen, D., Yin, X.: `Principle and property investigation of the transient current differential protection based on correlation analysis', IEEE Int. Conf. on Power Engineering Society Winter Meeting, 2000, p. 1945–1949.
-
4)
-
J.L. Suonan ,
W.Q. Shao ,
G.B. Song
.
Study on single-phase adaptive reclosure scheme based on parameter identification.
Third Int. Conf. on Electric Utility Deregulation and Restructuring and Power Technologies
,
6 ,
1797 -
1801
-
5)
-
Ito, H., Shuto, I., Ayakawa, H., Beaumont, P.: `Development of an improved multifunction high speed operating current differential relay for transmission line protection', Seventh IEE Int. Conf. on Developments in Power System Protection, April 2001, p. 511–514.
-
6)
-
S. Jiale ,
Z. Yining ,
Q. Jun
.
Study of current differential protection using time-domain capacitive current compensating algorithm on Π-model.
Proc. CSEE
,
5 ,
12 -
18
-
7)
-
Bi, T.S., Yu, Y.L., Huang, S.F.: `An accurate compensation method of distributed capacitance current in differential protection of UHV transmission line', IEEE Power Engineering Society General Meeting, October 2005, USA, p. 770–774.
-
8)
-
Z. Yining ,
S. Jiale
.
Phaselet-based current differential protection scheme based on transient capacitive current compensation.
IET Gener. Transm. Distrib.
,
4 ,
469 -
477
-
9)
-
J.L. Suonan ,
J.D. Xia ,
K. Alimjan
.
Novel transmission line pilot protection principle based on composite impedance of individual phase.
Proc. CSEE
,
5 ,
43 -
50
-
10)
-
Mcmurdo, J.N., Weller, G.C.: `Applications of digital differential protection', Fifth IEE Int. Conf. on Developments in Power System Protection, 1993, p. 115–118.
-
11)
-
T. Segui ,
P. Bertrand ,
M. Guillot
.
Fundamental basis for distance relaying with parametrical estimation.
IEEE Trans. Power Deliv.
,
2 ,
99 -
104
-
12)
-
S. Jiale ,
Q. Jun
.
An accurate fault location algorithm for transmission line based on R–L model parameter identification.
Electr. Power Syst. Res.
,
5 ,
17 -
24
-
13)
-
Yang, J.C., Yin, X.G., Chen, D.S.: `The study of sampled value differential protection', Transmission and Distribution Conf. Exposition, 2003 IEEE PES, September 2003, 1, p. 256–261.
-
14)
-
Dommel, H.W., Michels, J.M.: `High speed relay using travelling wave transient analysis', IEEE PES Winter Meeting, January/February 1978, New York, p. 1–7.
-
15)
-
Z.Y. Xu ,
Z.Q. Du ,
L. Ran
.
A current differential relay for a 1000 kV UHV transmission line.
IEEE Trans. Power Deliv.
,
3 ,
1392 -
1399
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