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为实现配电室的低压母线不停电合环倒闸,通过仿真计算和现场试验,验证了合环倒闸的可行性。研制了基于PLC的带合环保护功能的新型低压备自投装置,电源故障时自动实现备用电源自动投入功能,倒闸操作时低压用户无须停电即可自动完成电源切换、实现运行方式的自动调整。该装置已规模化应用于北京地区配电网。
In order to realize the uninterrupted closing of the low voltage busbar in the distribution room, the feasibility of the closed loop closing is verified by simulation and field tests. A new type of low-voltage backup device with loop protection function based on PLC is developed. The automatic standby power supply function is automatically realized when the power fails. The low voltage user can automatically switch the power supply without switching off the power to realize the automatic adjustment of the operation mode . The device has been applied to large-scale distribution network in Beijing.