Non-contact type device and method for measuring breaking characteristics of breaker

Abstract

The invention provides a non-contact type device and method for measuring the breaking characteristics of a breaker. The device comprises a laser displacement sensor, a data acquisition unit and a data processing unit, wherein the laser displacement sensor, the data acquisition unit and the data processing unit are connected in sequence. The laser displacement sensor is used for obtaining dynamic linear displacement of a contact during breaking of the breaker, obtaining actually generated mechanical motion signals of the contact through certain trigonometric function conversion, and converting the mechanical motion signals into analog electric signals, wherein the mechanical motion signals are optical signals. The data processing unit is used for analyzing and processing digital signals, obtaining the angular displacement, the angular speed, the break time and other variables of the contact during the breaking according to a preset measurement algorithm, and drawing the correlative curve between the angular displacement and the time and the correlative curve between the angular speed and the time respectively. The non-contact type device for measuring the breaking characteristics of the breaker is convenient to mount, measuring errors caused in the installation process can be avoided, the angular displacement, the angular speed and other variables of a movable contact during breaking are directly measured in a non-contact mode, and therefore the breaking characteristics of the breaker can be grasped as a whole.

Description

technical field [0001] The invention relates to the technical field of measurement and detection, in particular to a non-contact device and method for measuring breaking characteristics of a circuit breaker. Background technique [0002] When the molded case circuit breaker is switched off, the movement of the contact is a non-linear movement around a fixed fulcrum, which brings great difficulty to the measurement. In order to measure the angular velocity and angular displacement of the contact during the breaking process of the molded case circuit breaker, technicians have done a lot of research work. The commonly used measurement method is to modify the circuit breaker, and install the The angular displacement sensor is used to measure the angular velocity of the contact during the breaking process. Another analysis method is to use the moment of inertia to describe the moment of inertia and angular velocity between the connecting rods under the assumption that the angular...

AI Technical Summary

Problems solved by technology

In order to measure the angular velocity and angular displacement of the contact during the breaking process of the molded case circuit breaker, technicians have done a lot of research work. The commonly used measurement method is to modify the circuit breaker, and install the The angular displacement sensor is used to measure the angular velocity of the contact during the breaking process. Another analysis method is to use the moment of inertia to describe the moment of inertia and angular velocity between the connecting rods under the assumption that the angular displacement and angular velocity of the contact are known. Displacement, angular velocity and the transformation relationship between the angular displacement and angular velocity of the moving contact, and the dynamic characteristics of each mechanism during the movement process. The disadvantages are: 1. This contact angular displacement sensor is not only inconvenient to install, but also damages the circuit breaker. Originality, and the installation process in the contact measurement will introduce measurement errors; 2. The method of quantitative analysis of the rotation characteristics is based on the premise that the dynamic characteristics of the moving contact are known, and the connection between the connecting rod of the circuit breaker is determined by parameters such as the moment of inertia. However, it is impossible to directly measure variables such as angular displacement, angular velocity and breaking time when the moving contact breaks.

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