Single-phase grounding fault identification method for small-current grounding system
A single-phase grounding fault, small current grounding technology, applied in the fault location, detecting faults according to conductor type, measuring electricity and other directions, can solve the problems of small fault current and low sensitivity of fault indicator, and achieve improved sensitivity and flexible topology. Adjust and implement clear effects
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[0020] A single-phase grounding fault identification method for a small current grounding system, providing overvoltage protection through a neutral point grounding resistance, and indicating the fault through a fault indicator at the cable outlet. Set the number of fault indicators according to the number of lines, and the outlets of each feeder and branch line are connected with fault indicators FD 1 、FD 2 ,...,FD m , where m is the total number of fault indicators.
[0021] The neutral point grounding resistor is a resistor device with variable impedance to the ground branch, and the neutral point grounding resistor is connected in series with the main grounding switch. The neutral point grounding resistance can adopt the following three structural forms: 1) The neutral point grounding resistance is a variable resistor, and the impedance adjustment method of the variable resistor is a prior art, and will not be repeated here. 2) The neutral point grounding resistance inc...
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