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A ground fault current control method and device

A current control and ground fault technology, applied in the electric power field, can solve problems such as large fault current, not enough to start line zero-sequence protection, large system impact, etc., and achieve the effect of flexible processing

Active Publication Date: 2021-02-02
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Abstract
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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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  • A ground fault current control method and device
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  • A ground 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

This application discloses a ground fault current control method and device, which controls the output voltage of a controllable voltage source to perform full compensation when a single-phase ground event occurs in the power grid system, and then detects whether the single-phase ground event of the power grid system has occurred within a preset time , if it is, control the controllable voltage source to keep the output voltage phase unchanged, reduce the output amplitude, calculate whether the output current of the controllable voltage source exceeds the preset multiple of the current amplitude, and if so, detect the controllable voltage source Whether the output current of the control voltage source exceeds the preset time, if so, control the output of the controllable voltage source to perform full compensation, through the ground fault current control method and device provided by the application, the output voltage of the controllable voltage source can be adjusted , to realize the control of the ground fault current, so that the single-phase ground fault can be handled flexibly.

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 the single-phase ground fault, 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 Patents(China)
IPC IPC(8): G01R31/52G01R31/08H02H7/28
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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