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Method for judging category of failures caused by electrical contact in sealed electromagnetic relay

A technology to seal electromagnetic, failure categories, used in the field of electromagnetics

Inactive Publication Date: 2010-08-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the mass transfer of the contact material caused by the arc will cause different changes in the effective gap between the relay contacts, resulting in different types of contact failures

Method used

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  • Method for judging category of failures caused by electrical contact in sealed electromagnetic relay
  • Method for judging category of failures caused by electrical contact in sealed electromagnetic relay
  • Method for judging category of failures caused by electrical contact in sealed electromagnetic relay

Examples

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Effect test

Embodiment 1

[0045] Embodiment 1: A method for determining the type of electrical contact failure of a sealed electromagnetic relay according to the present invention, the method steps are as follows:

[0046] Step 1: First, conduct a reliability life test on several sealed electromagnetic relay test samples, and record the relationship between the contact resistance, pull-in time, overtravel time, bounce time and other characteristic parameters of each test sample and the number of actions during the entire test process; , pull-in time, release time, overtravel time, arcing time, bounce time and other six characteristic parameters form a data matrix X n×6 , where n is the number of actions;

[0047] Step 2: In view of the different change characteristics of the characteristic parameters under different failure mechanisms (large dispersion, strong randomness, and strong correlation), the principal component analysis method is used to perform dimensionality reduction preprocessing on the mu...

Embodiment 2

[0072] Example 2: Combining Figure 1-Figure 3 According to the invention, a method for judging the electrical contact failure category of a sealed electromagnetic relay can provide a new way for judging the electrical contact failure mechanism of the sealed electromagnetic relay. The process of using principal component analysis method and distance discriminant analysis to discriminate the contact failure mechanism of electromagnetic appliances is as follows: figure 1 shown. After principal component analysis, the original multidimensional characteristic parameters can more clearly reflect the change characteristics of contact characteristics under different failure mechanisms. Among them, the contribution rate of the first pivot is the largest, maintaining most of the correlation between the characteristic parameters. Since the change of each characteristic parameter is closely related to the change of the contact gap, the main difference between wear failure, bridging fai...

Embodiment 3

[0094] Example 3: Binding Figure 2-Figure 11 , Hermetic electromagnetic relay multi-parameter monitoring reliability life system hardware design

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Abstract

The invention provides a method for judging the category of failures caused by electrical contact in a sealed electromagnetic relay. The method comprises the following steps: firstly, running tests on the reliability life of a plurality of sealed electromagnetic relays as the samples to be tested; recording the relation between the contact resistance and other characteristic parameters of each sample to be tested and the operation frequency thereof in the entire test process; forming a data matrix Xn*6 from the six characteristic parameters, such as the contact resistance; carrying out the dimension reduction pre-processing on the multi-dimension characteristic parameter data by using the principal component analysis method; extracting the corresponding data characteristics from the data subjected to the dimension reduction, and sorting the data characteristics by failure mechanisms; and calculating the Mahalanobis distances between the new sample to be tested and various training samples using the distance discriminant analysis method, and comparing the Mahalanobis distances to judge the category of the failure. Instead of opening a housing and achieving the failure analysis by optical microscopes and other instruments, the invention can eliminate the interference factors caused by other inducements and expose and locate the real causes of failures.

Description

(1) Technical field [0001] The invention relates to electromagnetic technology, in particular to a method for judging the electrical contact failure category of a sealed electromagnetic relay. (2) Background technology [0002] The sealed electromagnetic relay is an electromagnetic relay in the form of a metal shell seal. The erosion of the contacts by the arc generated in the breaking and closing process is the main reason for the failure of its electrical contact. Generally, after the electrical contact fails, the shell is opened, and the contact surface is observed and studied directly with the naked eye or with the help of optical microscopes, scanning electron microscopes and other instruments to determine the type of failure. This method can obtain the internal failure cause, ignores the contact characteristic degradation information during operation, does not quantitatively evaluate the degradation process, and sometimes cannot be operated due to objective conditions...

Claims

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Application Information

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IPC IPC(8): G01R31/327G06F19/00
Inventor 任万滨余琼翟国富
Owner HARBIN INST OF TECH
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