Intelligent ground protection method and system for neutral point of power distribution network

A neutral point ungrounded and grounded protection technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as high-impedance ground fault protection, improve power supply safety and reliability, and prevent developmental faults. , The effect of eliminating blind spots

Inactive Publication Date: 2017-05-10
孙嘉宁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Aiming at the disadvantages of the existing neutral point grounding mode of the distribution network, the present invention invents an intelligent control and protection system that automatically switches the neutral point grounding mode, adapts to the diversity of grounding faults, and provides one-to-one protection for various grounding faults. The corresponding intelligent protection eliminates the shortcomings of conventional grounding methods, solves the technical problem that conventional grounding methods cannot provide protection for high-impedance grounding faults, and effectively improves the safety and reliability of power supply

Method used

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  • Intelligent ground protection method and system for neutral point of power distribution network

Examples

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Embodiment 1

[0041] Example 1: Combiningfigure 1 , an intelligent grounding protection method for the neutral point of the distribution network. When the power grid is operating normally, the system is not grounded at the neutral point; If it is not a high-resistance grounding fault, then keep the original grounding mode; if it is not a high-resistance grounding fault, switch to the neutral point grounding mode), and deal with the fault. After the fault is eliminated (if the fault cannot be eliminated, the system will return to the neutral point Sexuality is not grounded.

Embodiment 2

[0042] Example 2: Combining figure 2 , as described in Embodiment 1, an intelligent grounding protection method for a neutral point of a distribution network is described by taking a protection system when the grounding device is a small resistance device as an example.

[0043] 2.1 When the power grid system is in normal operation, the three-phase voltage is balanced, the neutral point voltage is about zero, no current flows through the discharge gap, and the current flowing through the neutral point is also zero. At this time, the microcomputer measurement and control device cuts off the neutral point switch, and the system operates in a neutral point ungrounded mode;

[0044] 2.2 When a metallic or low-resistance single-phase grounding fault occurs, the voltage of the faulty phase drops sharply, the voltage of the non-faulty phase rises sharply, and the high displacement voltage generated by the neutral point is enough to break down the discharge gap, and the neutral point...

Embodiment 3

[0046] Example 3: Binding image 3 , as described in Embodiment 1, an intelligent grounding protection method for the neutral point of a distribution network will be described by taking the protection system when the grounding device is an arc suppression coil device as an example.

[0047] 3.1 When the power grid system is in normal operation, the three-phase voltage is balanced, the neutral point voltage is about zero, no current flows through the discharge gap, and the current flowing through the neutral point is also zero. At this time, the microcomputer measurement and control device cuts off the neutral point switch, and the system operates in a neutral point ungrounded mode;

[0048] 3.2 When a metallic or low-resistance single-phase ground fault occurs, the voltage of the faulty phase drops sharply, the voltage of the non-faulty phase rises sharply, and the high displacement voltage generated by the neutral point is enough to break down the discharge gap, and the neutr...

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Abstract

The invention discloses an intelligent ground protection method and system for a neutral point of a power distribution network. When a power grid runs normally, the neutral point is not grounded in a system. When single phase grounding of a line in the power grid occurs, the system enables neutral point grounding according to the failure property and handles the failure. After the failure is solved, the neutral point is not grounded again in the system. According to the invention, advantages of three regular grounding methods including neutral point no-grounding, small resistor grounding and arc suppression coil grounding are kept and shortcomings of said three grounding methods are avoided, so that grounding failure diversity is allowed and smart protection is provided for different kinds of grounding failures in one-to-one correspondence. Especially, a blind area in high resistance grounding failure in the three grounding methods is eliminated and high resistance grounding failure can be judged accurately and preventive protection is provided, so that developing failure is prevented and a technical problem that protection cannot be provided for high resistance grounding failure in the regular grounding methods is solved. The invention has great significance in power supply safety and reliability of the power distribution system.

Description

technical field [0001] The invention is mainly applied to a neutral point grounding system of a 6kV-35kV distribution network, specifically an intelligent neutral point grounding method and a grounding system of a distribution network. Background technique [0002] In the power system, the neutral point grounding method of the power grid is an important basis for ensuring the normal operation of the power grid, which involves the safety, reliability and economy of the power grid; interference etc. The safety and reliability of the power system, when other conditions are the same, only depends on the working mode of the neutral point of the power system. [0003] The grounding methods of the neutral point of my country's distribution network mainly include three categories: non-grounding, grounding through arc suppression coils, and grounding through small resistances. Non-grounding and grounding through arc suppression coils belong to small-current grounding methods, and sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 孙嘉宁
Owner 孙嘉宁
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