Method for calculating residual life of contact of switching electric appliance, detection device and contactor

Abstract

The invention relates to the field of low-voltage electrical apparatuses, in particular to a method for calculating the residual life of a contact of a switching electric appliance. The method comprises the steps that the contact resistance of the switching electric appliance is collected, and linear regression is carried out on obtained contact resistance; according to a linear regression line, initial impedance rc and current impedance rn are obtained; according to the initial impedance rc, the current impedance rn and the impedance variation delta r of the whole life cycle of the switchingelectric appliance, the residual life of the contact of the switching electric appliance is calculated. The method for calculating the residual life of the contact of the switching electric appliancehas the advantages that the method is simple and belongs to a direct measurement method, results are accurate, the universality is good, and popularization is easy. The invention further relates to adetection device for the residual life of the contact of the switching electric appliance, which has the advantages that the structure is simple, and the reliability of detection results is high. Theinvention further relates to a contactor, which has the advantages that the structure is simple, and the reliability of detection results is high.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a method for calculating the remaining life of a switch electrical contact, which can be used to predict the electrical life of the switch, which can be a contactor or a circuit breaker, and a detection device applying the above calculation method. , and also relates to a contactor applying the above calculation method. Background technique [0002] The current level of electrification in industrial applications is getting higher and higher, and the reliability requirements for power supply and distribution systems and their components are getting higher and higher. In the existing switching appliances, the contactor, as a control device, needs to be charged frequently to perform actions, and its electrical life is required to be relatively high, generally reaching millions of times. As an important component in the supply and distribution control system, the con...

AI Technical Summary

Problems solved by technology

This indirect measurement method can better reflect the overtravel residual for electromagnets controlled by DC voltage, but for electromagnets controlled by AC voltage, there is still a problem of time interval deviation caused by the phase angle of the control voltage.

Another indirect measurement method is the energy accumulation method. When the energy accumulates to a certain threshold, the life will end. This method requires a large amount of calculation and requires high hardware requirements, and is highly related to the specific product structure.

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