Analysis of a Verifying Method of Consistency Between CT/ PT Polarity and Directional Protective Relaying

Wang Meng(State Nuclear Power Engineering Company, Shanghai)

Abstract

The coordination correctness of Nuclear power plant current transformer (CT) / voltage transformer (PT) polarity and relay protection is often verifed through the dynamic test on the unit no load / load operating conditions. This paper proposes a test method to prevent and circumvent the failure of the dynamic test abnormality caused by the static power test before the plant power is applied and the whole group is started. Reduce the dynamic test workload and test diffculty, to ensure that the dynamic test safety risk control and control in the state.

Keywords

CT / PT loop; Polarity / direction; static / dynamic test; Relay protection

References

Xiaomin Yang. Principles and Applications of Power System Relay Protection[Ml. Beijing: China Electric Power Publishing House, 2006: 168-171. (in Chinese)

Ji Xu. Technical Specifcations for WXH-8IIA Wire Protection Device: 0204. (in Chinese)

GB 50150-2006, Standard for Hand-over Test of Electric Equipment Installation Engineering[S]: 26-27.

DL/T 995-2006, Testing Regulations on Relay Protection and Stability Control Equipment[S]: 6--14.

DOI: http://dx.doi.org/10.26549/met.v2i1.755