Circuit breaker breaking capacity evaluation method based on full current equivalence principle

A circuit breaker and full current technology, which is applied in the field of power grid security, stability and control, can solve problems such as the inability to reliably evaluate the real breaking capacity of a circuit breaker

Inactive Publication Date: 2017-05-31
STATE GRID CORP OF CHINA +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

It is impossible to reliably evaluate the real breaking capacity of a circuit breaker under actual working conditions by usi

Method used

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  • Circuit breaker breaking capacity evaluation method based on full current equivalence principle
  • Circuit breaker breaking capacity evaluation method based on full current equivalence principle
  • Circuit breaker breaking capacity evaluation method based on full current equivalence principle

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Embodiment Construction

[0026] The technical solutions in the present invention will be clearly and completely described below in conjunction with specific embodiments and accompanying drawings.

[0027] Please refer to figure 1 , the present invention provides a method for evaluating the breaking capacity of a circuit breaker based on the full current equivalent principle, comprising the following steps:

[0028] Step 1. Given the short-circuit current calculation network F, in the full wiring and full startup mode of the system, use the Power System Analysis Software Package (PSASP) to calculate the effective value of the period component of the short-circuit point A I″ A .

[0029] Step 2. Based on the short-circuit current calculation network F, use the power system analysis comprehensive program software to calculate the equivalent resistance R and equivalent reactance X of the short-circuit point A, and calculate the short-circuit current DC component decay time constant T A,dc , the calculat...

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Abstract

The invention provides a circuit breaker breaking capacity evaluation method based on a full current equivalence principle, which belongs to the field of power grid safety stability and control. A concept of a full current effective value is introduced to evaluate the energy released by arcs of the circuit breaker during an arc extinguishing process; when short circuit happens to the power system, the short circuit current contains a periodic component and a DC component, a short circuit point DC component decay time constant in an actual operation working condition is solved; if the constant exceeds a circuit breaker standard decay time constant, evaluation on the circuit breaker short circuit current breaking capacity is carried out through a full current effective value equivalence principle in the circuit breaker actual operation working condition and a standard operation working condition; and finally, through comparing the circuit breaker breaking capacity and the short circuit current in the actual working condition, risk points existing in operation of the power grid are found out. The short circuit current actual breaking capacity of each type of circuit breakers can be effectively evaluated, and basis is provided for short circuit current suppression measure making and circuit breaker model selection in the power grid.

Description

technical field [0001] The invention relates to the field of power grid safety, stability and control, in particular to a method for evaluating the breaking capacity of a circuit breaker based on the principle of full current equivalent. Background technique [0002] After a short circuit occurs in the power system, the short circuit current contains a periodic component and a DC component, and the DC component decays with the time constant of the power network. GB 1984—2003 "High Voltage AC Circuit Breakers" stipulates that the DC component standard decay time constants of 1000kV, 500kV, and 220kV voltage level circuit breakers under special working conditions are 120ms, 75ms, and 60ms respectively; due to the X / With large R values, the time constant of the DC component depends almost entirely on the power transformer and nearby generators, usually exceeding the standard decay time constant of circuit breakers, and can be as long as 150ms. [0003] In the current short-ci...

Claims

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Application Information

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IPC IPC(8): G01R31/333G01R31/327
CPCG01R31/333G01R31/327
Inventor 刘海光蔡德福周鲲鹏李大虎曹侃唐泽洋王涛黄文涛何俊董航周楚万黎刘曼佳
Owner STATE GRID CORP OF CHINA
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