Modeling and Analysis of Contactor Contact Bounce Based on Impact Theory

doi:10.16628/j.cnki.2095-8188.2021.03.003

Abstract

Abstract:

In view of the background of a 35 kV power grid cabinet in a power station,the contact bounce in a power network is studied.Firstly,based on the collision contact impact theoretical model of multi-rigid system,the switch characteristics and bounce simulation of the universal contactor were studied.The purpose of this paper is to assist the power network in modeling and analyzing the contactor closing behavior from an algorithmic perspective.Besides,the model can simulate the dynamic characteristics of contacts under loads condition.After that,the motion orbits dynamic equations of the moving contact for contactor are given,and the physical mechanism of the bounce occurrence is studied through the model.The experimental results show that the developed bounce calculation program can effectively evaluate the dynamic characteristics of the contactor.Finally,combining the typical control circuits of power systems commonly used in power networks,the developed bounce calculation program is used to analyze the influence of contact gaps,load voltages,and contact resistances on their bounce characteristics under capacitive loads.It can provide a reference for bounce suppression study for similar switching appliances in subsequent power networks.

Key words: power network, contactor, bounce modeling, capacitive loads, surge impact

CLC Number:

TM572

TENG Menglan, ZHANG Haili, LIU Lanxiang, YANG Wenying. Modeling and Analysis of Contactor Contact Bounce Based on Impact Theory[J]. LOW VOLTAGE APPARATUS, 2021, 0(3): 13-17.

Figures/Tables 7

References 15

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