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Intelligent dynamic power distribution network neutral-point grounding method and complete device

A technology of neutral point grounding and intelligent distribution network, which is applied in the direction of circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., to reduce the lightning arc establishment rate and tripping rate, Effects of improving power supply reliability and overcoming safety risks

Active Publication Date: 2013-07-17
李景禄
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims at the problems existing in the neutral point grounding of the current distribution network, and invents an intelligent dynamic distribution network neutral point grounding method and a complete set of devices

Method used

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  • Intelligent dynamic power distribution network neutral-point grounding method and complete device
  • Intelligent dynamic power distribution network neutral-point grounding method and complete device

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Embodiment Construction

[0015] The method and complete set of devices are suitable for substations where zero-sequence current transformers are installed on each feeder. The secondary measurement signal of the zero-sequence current transformer must be sent to the computer controller, and the computer controller must also be able to switch each feeder of the substation. Take control.

[0016] When the complete set of equipment is connected to the power grid, or the operation mode of the power grid changes, the switch of the arc suppression circuit is closed, the switch of the resistance circuit is opened, and the short circuit switch of the damping resistance is opened. , the computer measurement and control system starts the capacitive current measurement program to measure the grid capacitive current and adjust the compensation current I L , making it I L -I C ≤ I δ , I δ is the preset residual flow control value.

[0017] When a single-phase ground fault occurs in the power grid, the computer...

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Abstract

The invention discloses an intelligent dynamic power distribution network neutral-point grounding method and a complete device. The complete device comprises a grounding transformer (1), an arc suppression loop switch (2), a resistance loop switch (3), an adjustable reactor (4), a damping resistor (5), a damping resistor short-circuit switch (6), a resistor (7), a neutral-point voltage transformer (8) and a computer testing and control system (9). The intelligent dynamic power distribution network neutral-point grounding method and the complete device is technically characterized in that a power distribution network neutral-point grounding mode is dynamically converted from an arc suppression coil grounding mode into a small-resistance grounding mode. When the device is connected to a power grid or a power grid operation mode changes, the device firstly works in the arc suppression coil grounding mode. The device measures capacitive current, adjusts inductive current and enables IL-IC to be smaller than or equal to I delta, wherein the I delta is a preset residual current control value. When a single-phase grounding fault of the power grid occurs, the device outputs the inductive current to perform compensation and arc suppression to grounding fault current. If the fault is an instantaneous fault, the fault is eliminated through the compensation and the arc suppression. If the fault is a permanent fault and the grounding fault is still not eliminated after certain time T, the arc suppression coil grounding is converted into the resistance grounding mode, and a fault line is judged and disconnected by detecting zero-sequence current of feeder lines.

Description

technical field [0001] The present invention mainly relates to the field of neutral point grounding of distribution network, and specifically refers to an intelligent dynamic distribution network neutral point grounding method and a complete set of devices, which are suitable for dynamic switching of neutral point grounding methods and line fault points in 6-66kv distribution network Arc suppression treatment and fault line judgment and removal. Background technique [0002] Different neutral point grounding methods of distribution network have great influence on power supply reliability, internal overvoltage level and lightning arc establishment rate. The neutral point grounding method of the distribution network involves many factors such as the structure of the distribution network, the insulation level of lines and equipment, the configuration of relay protection, and the communication system and personal safety. The neutral point grounding methods of the distribution n...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H9/08
Inventor 李景禄李政洋周易龙
Owner 李景禄
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