直流系统短路故障的快速识别与短路保护

RAPID RECOGNITION AND PROTECTION OF SHORT-CIRCUIT FOR THE DC SYSTEM

提出了利用霍尔传感器测量直流系统回路电流、母线电压 ,以电流、电压综合判据快速识别直流系统短路故障的方法。采用可控直流断路器替代传统的熔断器法 ,将交流系统三段式微机电流保护原理应用于直流系统的短路保护 ,设计了辐射式 , , 段直流供电回路 ,同时为防止在切除故障支路时因 , 段开关同时拒动 ,而由 段开关切除故障引起的其他供电支路电源消失问题 ,对 段直流供电回路采用了备用开关自投方案 ,并研制了直流系统三段式微机电流保护装置。分析了该装置的选择性、灵敏性、速动性和可靠性。通过对样机的仿真实验和现场运行 。

A novel method that can rapidly recognize short-circuit for the DC system is proposed according to the integrative criterion of loop current and generatrix voltage measured by the HOER sensor. It uses controllable DC breakers instead of traditional fusion, and introduces the theory of three-segments AC protection for the DC system. Applying the same theory, it designs radiate segment one, two, three loops for the DC power supply. This method has the standby power when the DC power supply is lost that caused by the wrong action of segment one breaker and invalidation of segment two and three breaker. The device based on the method is also manufactured. The paper finally analyzes the selectivity, sensitivity, reliability an rapidity of the device. Results of simulations and the on-site operation of the prototype show validity and practicability of the proposed method.