A Simplified Circuit and Analysis Method for Ground Fault Current Full Compensation Analysis
A ground fault and current technology, applied in the power field, can solve problems such as difficult application and complex loop structure, and achieve the effect of simple loop, reduced complexity, and clear analysis process
Active Publication Date: 2020-06-05
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology
[0004] This application provides a simplified circuit and analysis method for ground fault current full compensation analysis to solve the problem that the circuit structure is complex and difficult to apply in the prior art
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[0025] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application. The technical solutions provided by various embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.
[0026] Such as figure 1 As shown, the present application provides a schematic structural diagram of a simplified circuit for ground fault current full compensation analysis. C-phase powe...
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The embodiment of the invention discloses a simplified loop for full-compensation analysis of grounding fault current and an analysis method. The loop includes a controllable voltage source, a controllable voltage source internal resistor, an A-phase power source, a B-phase power source, a C-phase power source, a first ground-distributed capacitor, a second ground-distributed capacitor, a third ground-distributed capacitor, a first ground leakage resistor, a second ground leakage resistor, a third ground leakage resistor and a grounding impedance. According to the embodiment, the loop is simple, the analysis process is clear, the complexity of the full-compensation analysis of the grounding fault current by adopting the controllable voltage source is greatly reduced, and the loop and the analysis method are suitable for the calculation and analysis of the controllable voltage source for the full compensation of single-phase grounding faults.
Description
technical field [0001] The present application relates to the field of electric power technology, in particular to a simplified circuit and analysis method for ground fault current full compensation analysis. Background technique [0002] my country's low-voltage distribution network generally adopts small current grounding methods, including the neutral point ungrounded method or the neutral point grounded method through the arc suppression coil. When the neutral point is not grounded, when the system capacitive current exceeds 5A, the grounding arc cannot be extinguished by itself, and the safety of personnel and operation cannot be guaranteed. When the neutral point is grounded through the arc-suppression coil, the grounding arc can be partially extinguished by itself due to the reactive current compensated by the arc-suppression coil, but the arc-suppression coil can only compensate for the reactive current, and there is still a grounding residual current after compensat...
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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 刘红文王科
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST