新型110 kV扩大内桥接线的电压切换回路

A Novel Voltage Switching Circuit for 110 kV Expanded Internal Bridge Connection

扩大内桥接线方式已经在110 kV变电站得到广泛应用,并制定了典型设计方案,但相应的二次电压切换回路还未建立统一标准。对当前电压切换回路存在的缺陷进行详细分析,针对总结出的问题提出一种改进的电压切换回路方案,并进行效果检查,结果表明该方案能使二次电压切换情况与一次运行状况相符,并且可避免母线二次电压误并列的情况,为电力系统安全稳定运行提供了保障。

Expanded internal bridge wiring method has been widely used in 110 kV substation,and a typical design scheme is developed,but the corresponding secondary voltage switching loop has not yet established a unified standard.The defects of the current voltage switching circuit are analyzed in detail,an improved voltage switching circuit scheme is proposed for the summarized problems,and the effect is checked.The results show that the scheme can make the secondary voltage switching situation consistent with the primary operating condition,and can avoid the misalignment of the secondary voltage of the bus,which provides a guarantee for the safe and stable operation of the power system.