Single-phase earth fault positioning method based on neutral point earth current starting
A single-phase ground fault and neutral point grounding technology, applied in the electronic field, can solve the problems of difficult setting of the starting threshold, difficult starting, out-of-synchronization of sampling, etc., to achieve automatic frequency calibration, save time and effort in construction, and ensure accurate synchronization Effect
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[0047] Such as image 3 as shown,
[0048] A single-phase grounding fault location method based on neutral point grounding current start-up, which is mainly used in neutral point grounding systems through small resistance. The neutral point grounding current is measured by the current transformer installed at the neutral point grounding resistance of the substation busbar, and the neutral point grounding current is used as the single-phase grounding fault sudden change starting element, and the bus neutral point grounding current starting device 102 records the sudden change neutral point grounding current waveform at any time, and call the three-phase current waveforms of all wide-area synchronous smart sensors 101 installed along the substation outgoing line at the same time, and use the wide-area synchronous information to locate faults.
[0049] figure 2 It is a schematic diagram of the zero-sequence current direction at the moment of the ground fault of the present in...
Embodiment 1
[0069] 1. Reference Figure 4 , select a substation, and install the bus neutral point grounding current starting device and wide-area synchronous intelligent sensor on the bus and outgoing lines of the substation respectively;
[0070] 2. If figure 1 with Figure 5a , when a single-phase ground fault occurs, the neutral point ground current starting device of the busbar will capture the sudden change of the neutral point ground current, and record the sudden change time T and the neutral point ground current waveform at the corresponding time;
[0071] 3. If Figure 5b , the busbar neutral point grounding current starting device initiates the action of calling and recording waves, and obtains the three-phase current waveform and the neutral point grounding current waveform at the same time T from all wide-area synchronous smart sensors on the line with exactly the same time label;
[0072] 4. The neutral point grounding current starting device of the busbar first synthesiz...
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