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Power grid neutral point active resistor grounding method

A technology of active resistance and grounding method, which is applied in the field of electric power, can solve problems such as increased tripping times, influence on normal power supply, and decline in reliability of user power supply, and achieve the effects of ensuring correct operation, improving equipment utilization, and simple installation

Active Publication Date: 2015-05-20
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

This grounding method increases the number of trips of the line, affects the normal power supply of users, and reduces the reliability of user power supply. However, in the power grid with backup power supply, especially in the power grid powered by cables, it can ensure the reliable operation of the entire power grid, and its application is becoming more and more extensive. Especially industrial parks in Europe and China

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  • Power grid neutral point active resistor grounding method
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  • Power grid neutral point active resistor grounding method

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] The neutral point active resistance grounding method of the power network of the present invention can be applied to a 3-66kV power network to provide a constant resistive current at the ground point after a single-phase ground fault, and realize the function of quickly removing the fault line.

[0022] Its specific implementation process is:

[0023] 1. Determining Active Resistor Circuit Structure

[0024] Since the ground resistive current in the 3-66kV power network needs to generate a zero-sequence current to the ground network, and the amplitude, phase and frequency of the current are required to be adjustable within a certain range. In the method of the present invention, the power electronic commutation components with a three-phase four-bridge structure share a DC bus, the output ends of the four bridge arms are respectively connected to the three-pha...

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Abstract

The invention discloses a power grid neutral point grounding active resistor method. The method is realized through arranging a power electron commutation assembly and a corresponding detection and control assembly between a three-phase bus and the ground in a neutral-point small grounding mode power grid. When single-phase grounding fault happens to the power grid, the power electron commutation assembly generates current, resistive current passing through a grounding point is close to a certain set value, a relay protection device is started to cut off a fault line and the grounding point, a grounding arc can be prevented from being generated for a long time, and a neutral-point grounding transformer and a grounding resistor are replaced.

Description

technical field [0001] The invention relates to the technical field of electric power, in particular to an active resistance method for neutral point grounding of a power grid. Background technique [0002] The neutral point of the three-phase AC power system, that is, the neutral point of the star-connected transformer and motor, and the electrical connection between the earth is called the grid neutral point grounding method. The neutral point grounding method involves the safety, reliability and economy of the power grid, and directly affects the selection of equipment insulation level, system overvoltage level and relay protection mode, communication interference, etc. [0003] The power grid of 110kV and above generally adopts the large current grounding method, that is, the neutral point effective grounding method, so that the neutral point potential is fixed at the ground potential, and when a single-phase ground fault occurs, the voltage of the non-faulted phase will...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02H7/26
Inventor 时振堂李君秦文杰
Owner CHINA PETROLEUM & CHEM CORP
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