预防10kV系统电压无功控制装置故障策略研究

对变电站10 kV系统电压无功控制装置运行的特点、出现的故障类型,以及避免故障的防范措施进行了深入研究。针对补偿电容器投入时的涌流与谐振、运行中的爆炸、切除后的剩余电压等问题,分别采用了按电容器组接线的电压平衡保护、串联电抗器、并联平衡放电线圈等技术;为满足电压的实时控制与无功跟踪补偿,采用了变电站运行方式的自识别、专用开关的分散控制技术。变电站电压的综合控制与无功补偿、系统的谐振过电压与电容器的剩余电压、保护的可靠性与灵敏度、电容器的分组与循环投切等难题得到彻底解决。避免故障的防范措施与电压无功控制的效果,在20余座变电站3年的运行中得到验证。

Strategies to prevent faults of voltage and reactive power control equipment for 10 kV system

Operating features,failure modes and countermeasures of voltage and reactive power control equipments in 10 kV system of substation are studied.The voltage balance protection according to connections of capacitor group is used for the inrush current and resonance during its switch-in,the series reactor for the explosion during its operation and the parallel discharge coil for the residual voltage during its switch-out.To meet needs of real-time voltage control and reactive power compensation,the adaptive identification of operating mode and distributed control of special breakers are applied.The integrated voltage control and reactive power compensation of substation,the prevention of system resonant over-voltage and capacitor residual voltage,the reliability and sensitivity of protection,and the grouping and circulating switching of capacitors are realized.Measures to prevent faults and effects of reactive power control have been verified in the operation of more than twenty substations for three years.