Phasor estimation technique to reduce the impact of coupling capacitor voltage transformer transients

A new least squares technique to reduce the impact of the transient response of coupling capacitor voltage transformers (CCVTs) on the performance of distance relays is described. Several factors that affect the frequency and time responses of CCVTs are considered. The effect of the transient response on the phasor-estimates is illustrated. An improved least squares technique, which uses the knowledge of the frequency of the CCVT transients while estimating the phasors, is presented. A case, taken from a set of studies, is included to demonstrate the performance of the proposed approach. The robustness of the method is verified by a CCVT parameter sensitivity study.

[1]  A. Sweetana.  Transient Response Characteristics of Capacitive Potential Devices , 1971 .

[2]  M. A. Hughes.  Distance relay performance as affected by capacitor voltage transformers , 1974 .

[3]  M.S. Sachdev,et al.  A New Algorithm for Digital Impedance Relays , 1979, IEEE Transactions on Power Apparatus and Systems.

[4]  Transient Response of Coupling Capacitor Voltage Transformers IEEE Committee Report , 1981, IEEE Transactions on Power Apparatus and Systems.

[5]  雨谷 昭弘.  Alternative transients program rule book , 1989 .

[6]  Mladen Kezunovic,et al.  Digital models of coupling capacitor voltage transformers for protective relay transient studies , 1992 .

[7]  W. W. L. Keerthipala,et al.  Improved simulation models for current and voltage transformers in relay studies , 1992 .

[8]  Walter Elmore,et al.  Protective Relaying Theory And Applications , 1994 .

[9]  H. J. Vermeulen,et al.  Equivalent circuit modelling of a capacitive voltage transformer for power system harmonic frequencies , 1995 .

[10]  Daqing Hou,et al.  Capacitive voltage transformer: transient overreach concerns and solutions for distance relaying , 1996, Proceedings of 1996 Canadian Conference on Electrical and Computer Engineering.

[11]  M. R. Iravani,et al.  Digital time-domain investigation of transient behaviour of coupling capacitor voltage transformer , 1998 .

[12]  Eugeniusz Rosolowski,et al.  Dynamic compensation of capacitive voltage transformers , 1998 .

[13]  Mladen Kezunovic,et al.  Mathematical models for current, voltage, and coupling capacitor voltage transformers , 2000 .

[14]  B. Kaszteny,et al.  Distance relays and capacitive voltage transformers balancing speed and transient overreach , 2000 .

[15]  M. Adamiak,et al.  Advancements in Adaptive Algorithms for Secure High-Speed Distance Protection , 2002 .

[16]  M.S. Sachdev,et al.  An improved voltage phasor estimation technique to minimize the impact of CCVT transients in distance protection , 2005, Canadian Conference on Electrical and Computer Engineering, 2005..

[17]  W. Neves,et al.  Coupling Capacitor Voltage Transformer : Laboratory Tests and Digital Simulations , 2005 .

[18]  James S. Thorp,et al.  Computer Relaying for Power Systems , 2009 .