Wind power farm grid-connected power transmission line instant single-phase grounding fault single-end distance measuring method
A technology for single-phase ground faults and transmission lines, which is applied to the fault location, detects faults according to conductor types, and measures electricity. It can solve problems such as inability to perform accurate fault distance measurement, and achieve high practical value and high distance measurement accuracy.
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[0043] The embodiment of the method for single-end single-end distance measurement of single-phase ground fault of T-connection transmission line based on fault isolation multi-time information proposed by the present invention is described in detail as follows:
[0044] A 220kV wind farm access transmission system model applying the present invention is as follows figure 1As shown, the line length is 100km, and the line parameter values are shown in Table 1; the 60MW doubly-fed wind farm on the wind farm side is connected to the system, the potential on the system side is 220∠0°kV; the zero-sequence impedance on the system side is 28.14∠ 86.74°Ω; the positive sequence impedance is: 32.0∠78.4°Ω. The fault distance measuring device applying the method of the invention is installed on the side of the wind farm, and the voltage and current come from the voltage transformer and the current transformer on the line side respectively. The simulated fault type is an instantaneous g...
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