主网母线保护运行问题及对策

The Issues and Measures of Operation of HV Busbar Protection

大型发电厂及变电站的高压母线是极其重要的电气元件，对复杂接线方式下构成环路的各类母线，母差保护装置不应因为母线故障时有流出母线的电流而导致装置灵敏度降低甚至拒绝动作。母线连接元件倒闸操作过程中，母差保护装置应正确判断并瞬时切除故障。通过对中阻抗母线保护装置运行中遇到的这些问题进行分析，提出保证装置运行可靠性和灵敏性的措施。

High-voltage Busbar of large-scale power plant and power substation is extremely important electric components. For all kinds ofbusbar composing loop circuit under complicated connection mode, when busbar fault occurs the current flows from busbar, busbar differential protection should not low down the sensitivity, even disoperate. During switching over ofbusbar connective components, busbar differential protection should trip correctly and remove the fault instantly. This article analyzes some operation issues of middle impedance busbar protection device in operation and proposes some measures to ensure its reliability and sensitivity.