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Power distribution network ground fault arc extinction method and device based on stepless voltage regulation

A technology of ground fault and stepless adjustment, which is applied in the field of power system, can solve the problems of complex structure of flexible devices, arc suppression coils cannot effectively suppress arc overvoltage, etc., and achieve the effect of simple structure, high reliability and simple control method

Pending Publication Date: 2022-04-08
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for ground fault arc suppression in distribution network based on stepless voltage regulation, so as to solve the shortcomings that the existing arc suppression coil cannot effectively suppress the arc overvoltage and the structure of the flexible device is complex

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  • Power distribution network ground fault arc extinction method and device based on stepless voltage regulation
  • Power distribution network ground fault arc extinction method and device based on stepless voltage regulation
  • Power distribution network ground fault arc extinction method and device based on stepless voltage regulation

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Embodiment Construction

[0042] The technical solutions in the present invention are clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0043] It should be noted that, as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, ", it indicates the presence of features, steps, operations and / or combinations thereof.

[0044] figure 1 It shows one embodiment of the stepless voltage regulation-based distribution network ...

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Abstract

The invention discloses a power distribution network ground fault arc extinction method and device based on stepless voltage regulation, relates to the technical field of power systems, and aims to obtain a voltage opposite to a fault by using a low-voltage side voltage of a zigzag transformer to suppress a neutral point voltage, quickly switch a neutral point series resistor, change the neutral point voltage and quickly judge whether a fault point disappears or not. Compared with an active arc extinguishing device using a power electronic device, the device disclosed by the invention realizes arc extinguishing through simple transformer, resistor selection and electrodeless on-load voltage regulator, and is simple in structure, low in cost and high in adaptability and stability.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a method and device for arc suppression for grounding faults in distribution networks based on stepless voltage regulation. Background technique [0002] The distribution network accounts for more than 95% of the power grid. At the same time, the structure of the distribution network is complex, and single-phase ground faults occur frequently. Single-phase grounding faults can easily cause arc overvoltages. If they cannot be dealt with in time, it may lead to accidents such as electric shock, fire, and power failure. At present, there are two grounding fault disposal methods, one of which is a large current grounding method. In this method, the neutral point is grounded with a small resistance, and the fault characteristics are large. When a fault occurs, it can trip in time and cut off the faulty line. However, this method leads to faults. The tripping rate is...

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Application Information

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IPC IPC(8): H02H9/08H02H7/26
Inventor 俞小勇黄升平邹宇袁智勇吴丽芳李昌欧阳健娜雷金勇董沛材谢国汕潘姝慧白浩
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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