A Discrimination Method for Disappearance of Ground Fault with Full Compensation of Controllable Voltage Source
A ground fault and identification method technology, applied in fault location, reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve the problem of inability to quickly and accurately determine whether the ground fault disappears, and achieve an effective identification method and accurate calculation. , the effect of effective ground fault disappearance
Active Publication Date: 2020-03-10
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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[0004] This application provides a method for judging the disappearance of a ground fault with full compensation of a controllable voltage source to solve the problem in the prior art that it is impossible to quickly and accurately judge whether the ground fault has disappeared
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[0017] 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.
[0018] The grounding current full compensation of the power grid system can compensate the grounding point current to a minimum value when the single phase is grounded, and the system can s...
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The invention discloses a controllable voltage source full compensation grounding fault disappearance discrimination method. After system single-phase grounding, a controllable voltage source is fullycompensated. The output voltage amplitude of the controllable voltage source is maintained to be unchanged, and the phase angle of the output voltage of the controllable voltage source is changed. Before or after the phase angle of the output voltage of the controllable voltage source is changed, if the phase angle of the zero sequence current of all lines is changed with the phase angle of the output voltage of the controllable voltage source, a grounding fault disappears and the controllable voltage source stops compensation output. The method is simple, calculation is accurate, applicability is high, a controllable voltage source single full compensation structure or a controllable voltage source parallel arc suppression coil full compensation structure can be used, and a simple and effective grounding fault disappearance discrimination method under a controllable voltage source grounding current full compensation state is provided.
Description
technical field [0001] The present application relates to the technical field of single-phase ground current full compensation in power grids, and in particular to a method for discriminating the disappearance of a controllable voltage source full compensation ground fault. Background technique [0002] In the power grid system, especially in the medium and low voltage distribution network system, the single-phase ground fault accounts for the absolute majority of the total number of faults. The neutral point grounding methods of the medium and low voltage distribution network mainly include the neutral point non-grounding method, the neutral point grounding method through the arc suppression coil or the neutral point grounding method through a low-value resistance. In the neutral point ungrounded mode, the ground current is not compensated and operates with a fault, which poses a risk of personal electric shock. When the neutral point is grounded through the arc-suppressio...
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IPC IPC(8): G01R31/52G01R31/08H02J3/18
CPCY02E40/30
Inventor 刘红文王科柴晨超
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST