A leakage protection method for urban rail transit power supply system
A technology for urban rail transit and power supply systems, applied in the leakage protection field of urban rail transit power supply systems, can solve problems such as unavoidable leakage, tripping, and failure to determine the fault section, etc., to achieve the effect of reducing impact and quickly repairing work
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[0031] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0032] see Figure 1 to Figure 3 As shown, the embodiment of the present invention will firstly describe the system used to realize the method.
[0033] The earth leakage protection devices currently on the market are all voltage detection type protections. When an earth leakage fault occurs, all protection devices on the line will detect the existence of leakage voltage (the voltage of the parallel circuit is equal), so it will cause the entire line Tripped, unable to determine the faulty section of the leakage.
[0034] The system of this embodiment introduces the judgment of the differential current, so that the leakage area can be accurately determined, but when there is a vehicle braking on the line, the value of the differential current cannot be determined, so the device of this embodiment introduces the judgm...
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