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《Electrical Engineering》 2012-09
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Distance Protection of Double End Power Lines Based on Adaptive Control

Zhao Xiaodong1 Cui Dandan2 Zi Jianhua3 Yuan Yuan4 (1. Suzhou Electric Power Supply Company, Suzhou, Anhui 234000; 2. Suzhou Agricultural Power Co., Ltd., Suzhou, Anhui 234000; 3. Jingzhou Electric Power Supply Company, Jingzhou, Hubei 434000; 4. Hanzhong Power Supply Bureau, Hanzhong, Shaanxi 723000)  
As the protection device that guarantee the normal operation of the power system, relay protection should be sure that can correctly, quickly and reliably act in case of various failure. So it need protection device adaptive feedback ability, and according to type change of system fault, then adjust the setting values in time, make sure it works in the best state.This paper describes the characteristics of the traditional distance protection and its shortcomings, also analysis when the double power lines grounded faulty, the transition resistance influence the set value of protection device.Based on this theory puts forward an algorithm that define the adaptive of the impedance measurement according to the current distribution coefficient when the double end power lines grounded faulty through transition resistance, and through calculation the tilt angle of quadrilateral impedance relay, then realized the requirements that the device adaptive control of distance protection.
【CateGory Index】: TM773
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