Neutral point grounding mode switching device and method

A neutral point grounding and neutral point technology, which is applied in the field of distribution network, can solve the problems of single neutral point grounding method, which cannot effectively eliminate distribution network faults, etc.

Inactive Publication Date: 2019-09-17
云南电力技术有限责任公司 +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] In order to solve the problem that the existing single neutral point grounding method cannot effectively eliminate the faults in the distribution network, this application discloses a neutral point grounding switching device and method through the following embodiments

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  • Neutral point grounding mode switching device and method

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Embodiment Construction

[0021] In order to solve the problem that the existing single neutral point grounding method cannot effectively eliminate faults in the distribution network, the present application discloses a neutral point grounding switching device and method through the following embodiments.

[0022] The first embodiment of the present application discloses a neutral point grounding mode switching device, see figure 1 As shown in the schematic diagram of the structure, the device includes:

[0023] A controller 1, an arc suppression coil 2 connected to the neutral point of the system, and a grounding resistor 4 connected to the neutral point of the system through a control switch 3.

[0024] In an implementation manner, the device further includes a Z-shaped grounding transformer B. The Z-type grounding transformer B is used to provide the neutral point of the system.

[0025] The controller 1 is used to disconnect the control switch 3 when the power distribution network is running norm...

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Abstract

The embodiment of the application discloses a neutral point grounding mode switching device and method. When a distribution network is in normal operation, a controller turns off a control switch of a grounding resistor, simultaneously monitors the grid capacitance current, and determines the combination state of an adjustable capacitor bank of an arc suppression coil. When a single-phase ground fault occurs in the distribution network, the controller adjusts the arc suppression coil to an over-compensation state according to the combination state of the adjustable capacitor bank, and gives full scope to the effect that the low residual current of a fault point slows down the recovery voltage rise speed of the fault phase under an arc suppression coil grounding mode so that the transient fault automatically disappears. When the duration of the single-phase ground fault occurring in the distribution network is greater than a preset duration, the control switch is turned on in order that the neutral point is grounded through the arc suppression coil and is grounded through the grounding resistor.

Description

technical field [0001] The present application relates to the field of distribution network technology, in particular to a neutral point grounding switching device and method. Background technique [0002] The electrical connection between the neutral point of the three-phase AC power system and the earth is called the neutral point grounding method of the distribution network. The neutral point grounding method involves the safety, reliability and economy of the distribution network. The 6-35kV distribution network generally adopts the neutral point ineffective grounding method, and the neutral point ineffective grounding method includes: grounding through arc suppression coils and grounding through resistors. Different neutral point grounding methods have their own advantages and disadvantages. The neutral point grounding method through the arc suppression coil has the advantages of small residual current of single-phase grounding and sustainable power supply, but there i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/28
CPCH02H7/28
Inventor 关静恩刘奔师海峰王科项恩新刘红文
Owner 云南电力技术有限责任公司
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