A protection method for shunt capacitor bank in mine-used reactive power compensation device
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摘要: 针对现有矿用无功补偿装置并联电容器组保护方法存在的成本高、灵敏性差、保护整定计算复杂等问题，分析了矿用低压无功补偿装置并联电容器组发生故障时的电容电流分布特性及故障特征；根据故障时会出现三相不平衡对地电容电流导致零序电流不为零，且非故障电容器组零序电流与故障电容器组零序电流不相等的结论，提出了一种以零序电流为判据的无功补偿装置并联电容器组保护方法，仿真结果验证了该方法的有效性和可行性。Abstract: For high cost, poor sensitivity, complex protection setting calculation existed in current protection methods for shunt capacitor band in mine-used reactive power compensation device, characteristics of capacitor current distribution and fault were analyzed when shunt capacitor bank in mine-used reactive power compensation device broke down, and conclusions were gotten including that three-phase unbalanced grounding capacitor current would result in non-zero zero-sequence current when fault occurred, and zero-sequence current of non-fault capacitor bank was different with the one of fault capacitor bank. According to above conclusions, a protection method for shunt capacitor bank in reactive power compensation device was proposed which took zero-sequence current as criteria. The simulation results verify effectiveness and feasibility of the method.
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