软母线连接的变电站开关设备地震破坏原因分析
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摘要
在地震作用下,变电站内大量使用由软母线连接的瓷质绝缘开关类设备容易受到破坏。根据5.12汶川大地震变电站典型开关类设备的地震破坏情况,首先建立了通过软母线连接的隔离开关-电流互感器-断路器耦联系统有限元模型,在输入不同峰值加速度地震波的情况下,对设备-母线耦联系统分析了结构的地震响应,然后与单体设备的地震响应分析结果进行了对比。结果表明:单体设备以及设备-母线耦联系统的地震响应不同。通过母线连接的耦联系统中,母线会对连接的设备产生牵引作用,这是许多开关类设备地震作用下破坏的一个主要原因。软母线连接的开关类设备应综合考虑设备与母线的耦联作用来进行抗震性能分析。
The ceramic insulated switchgear equipment,which are very common in substations and are connected by flexible busbars,are prone to be damaged in earthquakes.According to the damages in 5.12 Wenchuan Earthquake,firstly,finite element model of coupled isolating switch-current transformer-circuit breaker system,which is connected by flexible busbars,is established to calculate structural responses of coupled equipment-busbar system under various earthquake accelerations.Then,results are compared with earthquake responses of individual equipment.Results show that the responses of individual equipment are different from that of coupled system.In flexible busbar-connected coupled system,busbar produces traction to equipment it connects,which is the major cause of many switchgear equipment damages under earthquake.To switchgear equipment connected by flexible busbars,the coupling effects between equipment and busbars should be taken into consideration in earthquake resistant analysis.
The ceramic insulated switchgear equipment,which are very common in substations and are connected by flexible busbars,are prone to be damaged in earthquakes.According to the damages in 5.12 Wenchuan Earthquake,firstly,finite element model of coupled isolating switch-current transformer-circuit breaker system,which is connected by flexible busbars,is established to calculate structural responses of coupled equipment-busbar system under various earthquake accelerations.Then,results are compared with earthquake responses of individual equipment.Results show that the responses of individual equipment are different from that of coupled system.In flexible busbar-connected coupled system,busbar produces traction to equipment it connects,which is the major cause of many switchgear equipment damages under earthquake.To switchgear equipment connected by flexible busbars,the coupling effects between equipment and busbars should be taken into consideration in earthquake resistant analysis.
引文
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