Single phase grounding current adaptive protection device

摘要

The effective model is suitable for power system. Single phase grounding current adaptive protection deviceZero phase sequence current sensor for each line,Zero sequence voltage measuring transformerThe first output is connected to the first input of the integrity index calculation unit,1. Output automatic adaptive current to correct the power supply at the first input end of the given protection action part;When the second input is completed, the given current signal can be received,The outlet is connected to the first input of the relay group,The attachment contains the first and second filters,Zero phase sequence voltage starting mechanismAnd logic elementIn this case, the output of the zero sequence current sensor is connected to the input of the first filter,This is the second input connected to the relay group,And the first input of the logic elementThe second output end of the measuring voltage transformer is connected to the input end of the second filter,The output is connected to the secondary input of the integrity index calculation unit,The zero phase sequence voltage starting mechanism is connected with the second output terminal of the zero phase sequence voltage measuring transformer,The second entry into the logic elementThe input is the output of the device. Technical output: when the average voltage is 6-35 kV, the power stability is improved;It has insulated neutral line and neutral grounding, and works through high resistance.