Circuit breaker operating characteristic analytical method based on virtual prototype technology

Abstract

The invention provides a circuit breaker operating characteristic analytical method based on the virtual prototype technology, which includes steps: firstly, setting up a speed index system, a displacement index system and a force index system for evaluating circuit breaker operating characteristics; secondly, determining eigenvalue of each index in the index systems; thirdly, setting up a circuit breaker model and obtaining simulation value of each eigenvalue by kinematically and dynamically simulating the circuit breaker operation process; and fourthly, calculating a deviation matrix of the circuit breaker operating characteristics according to a simulation value matrix and a reference value matrix. Applying the method to the circuit breaker design stage enables designers to comprehensively consider multiple operating characteristics. Compared with the prior art only considering several operating characteristics including switching-on and switching-off speed and switching-on and switching-off time, the method has the advantages that ten operating characteristics are comprehensively considered to lead the designers to work out more optimized designs, product development risks can be effectively reduced, and foundations can be established for comprehensive product performance improvement.

Description

technical field [0001] The invention belongs to the field of circuit breakers, and in particular relates to a method for analyzing the action characteristics of a circuit breaker based on virtual prototype technology. Background technique [0002] Low-voltage circuit breakers (hereinafter referred to as circuit breakers), also known as automatic switches, are widely used in circuit protection against voltage loss, undervoltage, overload, leakage and short circuit. It is an important control and protection device for power systems and the most commonly used industrial electrical appliance. one. Common types of circuit breakers include molded case circuit breakers, frame circuit breakers, current limiting circuit breakers, leakage protection circuit breakers, DC fast circuit breakers, etc., and their structures generally include contact systems, operating mechanisms, arc extinguishing chambers, Releases and accessories, etc. [0003] The operating characteristic of the circu...

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Problems solved by technology

[0010] Due to the complex internal structure of the circuit breaker and the blocking of each rod, in the actual measurement process, many moving parts of the operating mechanism cannot be photographed, and the measurement range is limited.

In addition, the camera method is generally used to measure motion parameters in action characteristics, such as trajectory indicators, displacement, speed, acceleration, and cannot directly measure mechanical parameters, such as closing force, spring force, etc.

[0011] At present, the design of the circuit breaker operating mechanism is only to meet the closing and opening speed and the closing and opening time, without considering other factors in the action characteristics, and the design effect is not ideal

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