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Single-phase arc-grounding simulation device for power distribution network

A grounding simulation, power distribution network technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. High performance, low cost and convenient impedance adjustment

Active Publication Date: 2016-07-06
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Build a test platform at the voltage level of the distribution network. Due to the high voltage, the corresponding power supply capacity needs hundreds of kVA, and the equipment cost is high.
In addition, testing under high voltage conditions has a higher safety risk

Method used

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Embodiment Construction

[0019] The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0020] figure 1 Shown is a schematic diagram of the circuit structure of the distribution network single-phase arc-light grounding simulation device of the present invention, and the distribution network single-phase arc-light grounding simulation device includes a three-phase isolation transformer 1, a grid-to-ground capacitance 2, a single-phase step-up transformer 3, Arc current generator 4, resistance adjustable water resistor 5 and high voltage switch 6.

[0021] The neutral point of the primary side of the three-phase isolation transformer 1 is grounded, the neutral point of the secondary side is suspended, and the three-phase windings of the secondary side are respectively grounded through three grid-to-ground capacitors 2, and any of the three-phase windings of the secondary side of the three-ph...

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Abstract

The invention provides a single-phase arc-grounding simulation device for a power distribution network. The single-phase arc-grounding simulation device comprises a 380V equivalent power distribution network, an arc current generator and a high-voltage switch, wherein the 380V equivalent power distribution network comprises a three-phase isolation transformer, a network ground capacitor and a single-phase step-up transformer; the 380V equivalent power distribution network improves a 380V power-frequency voltage to 10kV; the arc current generator generates an arc current at the 10kV voltage; the arc current generator comprises a current input terminal, a fuse and a current output terminal; one end of a secondary winding of the single-phase step-up transformer is grounded and the other end is connected with the current input terminal; the current input terminal is fixedly connected with one end of the fuse; the other end of the fuse is suspended; a distance which is about 1-3mm is kept between the fuse and the current output terminal; and the current output terminal is connected with the high-voltage switch and then is grounded. The single-phase arc-grounding simulation device can simulate an arc-grounding fault of the power distribution network under the condition of a 380V power supply, greatly reduces the power supply capacity and the equipment cost of an experiment platform and also reduces the safety risk of the experiment work.

Description

technical field [0001] The invention relates to the technical field of power system grounding fault simulation, in particular to a single-phase arc-light grounding simulation device for a power distribution network. Background technique [0002] my country's distribution network is a neutral point indirect grounding system, and the main fault form of the distribution network is single-phase grounding. Among them, arc ground faults caused by external factors such as lightning account for the largest proportion. The adoption of technical measures can reduce the continuous flow of power frequency at the fault point, promote the extinguishment of the arc at the fault point, make the phenomenon of arc grounding disappear, and the power grid will automatically resume normal operation, thereby greatly improving the reliability of power supply of the distribution network. [0003] Simulating arc-flash ground faults in distribution network is a necessary condition for researching ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/08H02H7/28
CPCH02H7/28H02H9/08
Inventor 沈煜阮羚邱凌朱涛陈鹏云李建明杨波周志强李昇周先平陈志军
Owner STATE GRID CORP OF CHINA
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