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Method for suppressing closing bounce of permanent magnet circuit breaker based on moving average filtering

A technology of moving average filter and permanent magnet circuit breaker, which is applied in the direction of circuits, parts of protective switches, contacts, etc., which can solve the problems affecting the stability of power system power supply, high overvoltage, and burnt contacts, etc., to achieve reduction Small impact, cost reduction, and the effect of reducing closing bounce

Active Publication Date: 2019-03-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The circuit breaker working on load will generate a high overvoltage due to the bouncing of the contacts, which will affect the power supply stability of the entire power system
Contact bouncing will also generate an arc with a large current, which will cause high temperature burning of the contacts, and even welding

Method used

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  • Method for suppressing closing bounce of permanent magnet circuit breaker based on moving average filtering
  • Method for suppressing closing bounce of permanent magnet circuit breaker based on moving average filtering
  • Method for suppressing closing bounce of permanent magnet circuit breaker based on moving average filtering

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Experimental program
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Embodiment 1

[0029] Embodiment 1: as figure 1 , figure 2 and image 3 As shown, a method based on moving average filter to suppress closing bounce of permanent magnet circuit breaker includes the following steps:

[0030] 1) Use the current sensor to collect the excitation current I flowing through the excitation coil L , the sampling interval is τ;

[0031] 2) According to the characteristics of capacitance and inductance, the relationship between current and voltage can be obtained as:

[0032]

[0033] In the formula, R and L are the equivalent resistance and inductance values ​​of the excitation coil respectively, and C is the energy storage capacitance value. u d with I L The initial values ​​of are all 0, solving the above first-order differential equations, we can know that I L As a smooth curve, the sampled I can be obtained by using the moving average filter method L The data is smoothed and filtered;

[0034] 3) From time t, the waveform of the excitation current is ...

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Abstract

The invention discloses a method for suppressing the closing bounce of a permanent magnet circuit breaker based on moving average filtering. According to the method, the coil current collected by a sampling circuit is adjusted by using a moving average filtering algorithm, and then the segmentation control of the closing process of the permanent magnet circuit breaker is carried out with the coilcurrent and proximity switch signal as control input quantities. The characteristics of the coil current in the closing process are used, the control of contact displacement is achieved, the contact bounce is suppressed, the service life of a vacuum tube is effectively prolonged, and the consistency of the closing time is improved. Therefore, the method is suitable for the control of the closing process of the permanent magnet vacuum circuit breaker.

Description

technical field [0001] The invention relates to a method for suppressing closing bounce of a permanent magnet circuit breaker based on moving average filtering, and belongs to the field of high-voltage electric appliance drive and intelligent control. Background technique [0002] Closing bounce refers to the phenomenon that the moving contact of the circuit breaker collides with the static contact and is pushed away by its reaction force, and then contacts again. A circuit breaker working on load will generate high overvoltage due to the bouncing of contacts, which will affect the power supply stability of the entire power system. Contact bouncing will also generate an arc with a large current, which will cause high temperature burning of the contacts, or even welding. With the increasingly higher reliability requirements of the power system, circuit breakers are facing greater challenges in all aspects of power system power generation, power transmission and distribution....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/50H01H9/54H01H71/50H01H71/68
CPCH01H1/50H01H9/54H01H71/504H01H71/68
Inventor 林鹤云张晗房淑华
Owner SOUTHEAST UNIV