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Grounding fault current control method and device

A current control and ground fault technology, applied in the electric power field, can solve the problems of large fault current, large system impact, insufficient to start line zero-sequence protection, etc., and achieve the effect of flexible processing

Active Publication Date: 2019-04-05
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Claims
  • Application Information

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Problems solved by technology

[0005] This application provides a ground fault current control method and device to solve the problem that the neutral point is grounded through a small resistance, the fault current is large, and the impact on the system is large, and it is not enough to start the line zero when a high resistance ground occurs. order protection

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  • Grounding fault current control method and device

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Embodiment Construction

[0038] 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.

[0039] see figure 1 , figure 1 It is a flow chart of a ground fault current control method provided in this application. The method of this embodiment can be applied to flexible control ...

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Abstract

The invention discloses a grounding fault current control method and device. During a grid system single-phase grounding event, a controllable voltage source is controlled to output voltage for full compensation; detection is carried out to judge whether the grid system single-phase grounding event lasts for a preset time or not; if the grid system single-phase grounding event lasts for the presettime, the controllable voltage source is controlled to keep a phase of the output voltage unchanged and decrease an output amplitude; calculation is carried out to judge whether output current of thecontrollable voltage source exceeds a current amplitude by a preset times or not; if the output current exceeds the current amplitude by the preset times, detection is carried out to judge whether the exceed output current of the controllable voltage source lasts for a preset time; and if the exceed lasts for the preset time, the controllable voltage source is controlled to output for full compensation. Through the grounding fault current control method and device provided by the invention, the control of grounding fault current can be realized through adjusting output voltage of controllablevoltage sources, so as to flexibly processing singe-phase grounding faults.

Description

technical field [0001] The present application relates to the field of electric power technology, in particular to a ground fault current control method and device. Background technique [0002] In the power grid system, especially in the medium and low voltage distribution network system, single-phase ground fault is the most common fault. The single-phase ground fault not only affects the normal power supply of users, but also may generate overvoltage, burn out equipment, and even cause phase-to-phase short circuit to expand the accident. [0003] In order to isolate single-phase grounding faults, the power distribution system often adopts the neutral point grounding method through a small resistance, and the fault current is relatively large, and then the grounding line is tripped through the line protection device. However, when the neutral point is grounded through a small resistance, the fault current is large and has a large impact on the system; and when high-resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/08H02H7/28
CPCG01R31/086G01R31/50H02H7/28
Inventor 刘红文王科柴晨超
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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