Abstract：Linear sinusoidal tractor for specific frequency signals with good amplitude and phase frequency characteristics can be used in detecting DC circuit grounding fault. The method of injecting signal for DC circuit grounding fault affected by branch distributed capacitance. A new method based on improved discrete LST for DC circuit grounding fault in station was presented in this paper. Mathematical model for the equivalent circuit of detection system was given. By rotation transformation of the algorithm for LST, the resistance current and equivalent capacitive current value of alternating current signal can be directly obtained. For a first-order differential treatment, the DC component can be filtered out, adjusting the tractor parameters, specific frequency AC signal under testing separated, according to the grounding resistance and the equivalent capacitance is calculated to give each branch grounding resistance and capacitance, The simulation results show that the algorithm can overcome the effects of stray capacitance and accurately detects grounding fault.
朱德亮, 苏建明. 考虑直流干扰条件下的变电站二次直流系统故障检测新算法[J]. 电气技术, 2017, 18(3): 97-101.
Zhu Deliang, Su Jianming. The New Method of Detecting DC Circuit Grounding Fault in Power Station Considering DC Interference. Electrical Engineering, 2017, 18(3): 97-101.
2017, Vol. 18 
