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A circuit breaker phase control suppression method for transmission line operating overvoltage

A technology for operating overvoltage and transmission lines, applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, which can solve the impact of circuit breaker reliability, shorten service life, temperature Increase and other problems, to achieve the effect of reducing line construction costs, suppressing operating overvoltage, and reducing the use of equipment

Active Publication Date: 2018-02-09
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the suppression of operating overvoltage on UHV lines is mainly through the following three methods: additional closing resistors for circuit breakers, installation of lightning arresters and shunt reactors on lines, and flexible limitation method; among them, the first two suppression measures are used in the current UHV transmission system It is widely used, but it has the following disadvantages in terms of economy and reliability: (1) The closing resistor not only increases the complexity and cost of the circuit breaker due to its complex structure and frequent faults, but also increases the System investment and maintenance costs, and its voltage limiting effect is unstable and highly dispersed; at the same time, the resistance consumes electric energy and generates a large amount of heat energy, which also affects the reliability of the circuit breaker itself. Therefore, other overvoltage suppression methods are increasingly used (2) Zinc oxide surge arresters and shunt reactors are prone to the following unfavorable phenomena during use: the valve plate is easily affected by moisture and deteriorates, resulting in active power loss caused by temperature rise when absorbing overvoltage, resulting in thermal collapse, which will lead to The arrester is damaged or exploded, causing a large-scale power outage. At the same time, the frequent action of the arrester and reactor under the operating overvoltage will shorten its service life

Method used

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  • A circuit breaker phase control suppression method for transmission line operating overvoltage
  • A circuit breaker phase control suppression method for transmission line operating overvoltage
  • A circuit breaker phase control suppression method for transmission line operating overvoltage

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0026] figure 1 It is a schematic diagram of the circuit breaker in the present invention under different closing phases, the curve diagram of the first positive breakdown. When the circuit breaker closes the no-load line, the voltage of the system where the circuit breaker is located is initially The phase angle is usually random and uncertain, so that the breakdown point voltage of the circuit breaker is also randomly distributed, and there is a maximum breakdown point and a theoretical minimum breakdown point. When the circuit breaker breaks through at the minimum breakdown point, the power frequency voltage curve just escapes the negative maximum breakdown point, so the minimum breakdown po...

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Abstract

The invention discloses a circuit breaker phase control suppression method for operating overvoltage of a transmission line, which is characterized in that the circuit breaker is turned on or off at the best phase angle of a reference signal to suppress the line side operating overvoltage; specifically comprising: Through the control unit, the accurate zero-crossing point of the voltage is obtained as the time reference for control, combined with the time when the dielectric recovery strength drops to α times the system power supply voltage level and the delay time of the circuit breaker command operation (α>1), calculate the time reference point and The delay time for a certain phase to issue a closing command, and at the same time, according to the three-phase electrical characteristics of the power grid, calculate the delay time for closing the other two-phase circuit breakers. The invention solves the technical problem of how to suppress the operating overvoltage at the line side by obtaining the optimal phase angle of the control switch in the reference signal, and closing or breaking at the phase angle.

Description

technical field [0001] The invention relates to a circuit breaker phase control suppression method for operating overvoltage of a transmission line, and belongs to the technical field of circuit system operation overvoltage suppression. Background technique [0002] During the operation of the power system, due to the maintenance or failure of the line, the opening and closing operation of the circuit breaker will be caused, the internal parameters of the system will change, the normal energy distribution and transmission of the power system will be changed, and internal overvoltage will be generated on the line. . There are many reasons for the generation of internal overvoltage, and the changes in parameters are various, so the characteristics of the overvoltage are also different, including amplitude, oscillation frequency, duration, etc. Usually, the internal overvoltage can be divided into temporary and temporary according to different causes. overvoltage and operating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04
Inventor 嵇建飞袁宇波王立辉钱佳斌
Owner STATE GRID CORP OF CHINA
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