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A method for checking the short-circuit current resistance capability of high-voltage circuit breakers

A high-voltage circuit breaker and short-circuit current technology, which is applied in the field of checking the ability of high-voltage circuit breakers to resist short-circuit current, and can solve the problems of ignoring the DC component to check the breaking capacity of the circuit breaker.

Active Publication Date: 2019-05-21
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In some cases, using only the periodic component of the short-circuit current and ignoring the DC component to check the breaking capacity of the circuit breaker will cause serious problems

Method used

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  • A method for checking the short-circuit current resistance capability of high-voltage circuit breakers
  • A method for checking the short-circuit current resistance capability of high-voltage circuit breakers
  • A method for checking the short-circuit current resistance capability of high-voltage circuit breakers

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specific Embodiment approach

[0031] The specific embodiment of the present invention comprises the following steps:

[0032] 1. Acquisition of the short-circuit current of the circuit breaker. There are two ways, one is to establish a power grid electromagnetic transient simulation system model through simulation calculation, and simulate the bus fault in the model (the short-circuit current of the circuit breaker is the largest at this time), and obtain the short-circuit current data of the circuit breaker; the other is to directly obtain the short-circuit current data from the power grid Obtained from the oscilloscope installed in the oscilloscope, for the short-circuit fault in the power grid, the oscilloscope will record the data of the short-circuit current flowing through the circuit breaker before and after each fault, which can be analyzed by obtaining the data. In this embodiment, a certain The waveform diagram of the short-circuit current of the circuit breaker is as follows: image 3 shown.

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Abstract

The invention discloses a method for checking short-circuit current resistance of a high-voltage circuit breaker. The method comprises the steps of: firstly, acquiring a short-circuit current value of the circuit breaker by adopting a power system simulation program for calculation or according to wave recording and acquisition; secondly, adopting an envelope curve method to obtain a DC component in a short-circuit current; thirdly, adopting an exponential fitting method to calculate an attenuation time constant of the DC component of the short-circuit current; and finally, judging whether short-circuit current switching-on / off abilities of the circuit breaker are inadequate through comparing whether the attenuation time constant exceeds a range specified by ''High-voltage AC Circuit Breaker''. Through comparing a difference between the time constant of the DC component of the short-circuit current of the circuit breaker calculated by adopting the method and a standard time constant, whether the circuit breaker has a risk of inadequate short-circuit capacity can be determined, and necessary prevention measures can be taken in time. The method provided by the invention is suitable for checking the short-circuit current resistance of the high-voltage circuit breaker in the electric power system.

Description

technical field [0001] The invention relates to a method for checking the anti-short-circuit current capability of a high-voltage circuit breaker in a power system, and belongs to the technical field of power system analysis. Background technique [0002] With the development of our country's society and the continuous growth of the national economy, the scale of the power grid is getting larger and larger. The corresponding grid voltage level is getting higher and higher, the grid load and power supply are increasing day by day, and the increase of lines, transformers and other equipment in the grid has continuously strengthened the grid structure of the grid. While increasing the reliability of power supply, the problem of excessive short-circuit current in the grid has become increasingly prominent. . The size of the short-circuit current has a great influence on the planning and operation of the power grid (such as the selection of electrical main wiring, the selection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327
CPCG01R31/3272
Inventor 苏永春汪晓明周宁舒展陈波程思萌王晓蔚
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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