A compound signal method selective leakage protection method and system
A technology of leakage protection and composite signal, which is applied in the direction of emergency protection circuit devices, automatic disconnection emergency protection devices, electrical components, etc., can solve the problem that the sub-switches cannot quantitatively determine the direction of the zero-sequence current, and the misoperation of the main switch , small capacitance to ground, etc., to overcome the misoperation or refusal of the sub-switch and the misoperation of the main switch
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[0017] like figure 1 As shown, the power supply line of the coal mine includes a main line and a plurality of sub-lines connected to the main line. The main line is provided with a main switch 100 and the sub-lines are provided with a sub-switch 200 . The branch switch 200 has a power directional leakage protector.
[0018] like figure 2 As shown, the main switch 100 includes an additional DC resistance detection component 101 , a low voltage protector 102 , a signal injection control component 103 , and an AC signal generator 104 . Wherein, the additional DC resistance detection component 101 is arranged on the main line and connected to the low voltage protector 101 , and the low voltage protector 102 is further connected to the signal injection control component 103 . The AC signal generator 104 is grounded, and its three-phase output wires are connected to the AC signal input end of the signal injection control unit 103, and the three-phase output wires of the AC signal...
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