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10000 volt power grid neutral point grounding device

A neutral point grounding and power grid technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problem of affecting system power supply reliability, inability to distinguish between instantaneous faults and Non-instantaneous faults, high line tripping rate, etc., to achieve excellent overvoltage protection performance, wide application range, and large capacity

Inactive Publication Date: 2015-03-11
STATE GRID CORP OF CHINA +5
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Problems solved by technology

However, due to the inability to distinguish between instantaneous faults and non-instantaneous faults, all trips are implemented, resulting in a high tripping rate of the line, which affects the reliability of the power supply of the system

Method used

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  • 10000 volt power grid neutral point grounding device

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Embodiment Construction

[0009] The neutral point grounding device of the 10 kV power grid proposed by the present invention is connected to the neutral point grounding device on the neutral point 1 of the 10 kV power grid. The circuit schematic diagram of each neutral point grounding device is as follows figure 1 As shown, it includes an isolating switch 2, a first nonlinear resistor 3, a fast current-limiting fuse 4, a plurality of special fuses 5, a second nonlinear resistor 8, a plurality of third nonlinear resistors 9, and a zero-sequence current transformer 6 and signal controller 7, the neutral point 1 of the 10kV power grid is connected to the first non-linear resistor 3 through the isolating switch 2, and the two ends of the first non-linear resistor 3 are connected in parallel to the fast current-limiting fuse 4, and the line after parallel connection is connected with The second non-linear resistance 8 is connected; the two ends of the second non-linear resistance 8 are connected in paralle...

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Abstract

The invention relates to a 10000 volt power grid neutral point grounding device and belongs to the field of power system neutral point grounding technology. A 10000 volt power grid neutral point is connected to a first nonlinear resistor through an isolation switch; two ends of the first nonlinear resistor are connected to a fast current limiting fuse parallelly, and parallelly-connected circuits are connected to a second nonlinear resistor; two ends of the second nonlinear resistor are parallelly connected to branch circuits which are serially connected with multiple special fuses and multiple nonlinear resistors, and parallelly-connected circuits are grounded through a zero sequence current transformer; signals acquired by the zero sequence current transformer enter a signal controller and are used for controlling the isolation switch and the fast current limiting fuse to act. The device has high power supply reliability, excellent voltage protection performance and the advantages of a low-resistance grounded system and the advantages of large capacity, low cost, simple structure and small occupied area, and the application range of the device is expanded.

Description

technical field [0001] The invention relates to a neutral-point grounding device for a 10-kilovolt power grid, in particular to a neutral-point grounding device mainly composed of a non-linear resistor and a fuse, and belongs to the technical field of neutral-point grounding in electric power systems. Background technique [0002] The existing 10 kV distribution network neutral point grounding methods in the power system mainly include neutral point ungrounded, neutral point grounded through arc suppressing coil and neutral point grounded through small resistance. [0003] These three methods have their own advantages, but there are also obvious disadvantages. The method of ungrounding the neutral point is simple, but the scope of application is small. When the capacitive current is relatively large, it is very easy to generate arc over-point voltage, so the neutral point ungrounded method can only be applied to the area where the capacitive current is small in the power sy...

Claims

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Application Information

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IPC IPC(8): H02H9/04H02H3/16
Inventor 彭珑赵媛蔡巍卢毅孙云生毛婷郭道林马鑫晟端木林楠潘卓钱欣肖寒刘大利袁阳李文琦刘英军许竞韩彥玲谢小英杨长青孙德彬盛利
Owner STATE GRID CORP OF CHINA
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