Circuit breaker operating mechanism spring expansion and contraction characteristic test method based on image processing

Abstract

The invention discloses a circuit breaker operating mechanism spring expansion and contraction characteristic test method based on image processing, which relates to the technical field of circuit breaker fault diagnosis. The circuit breaker operating mechanism spring expansion and contraction characteristic testing method based on image processing includes: using a high-speed camera to capture the deformation process of the actuator spring when the circuit breaker is switched on and off, taking the first segment of the moving end as the motion recognition target, combining with the deformation characteristics of the spring in the circuit breaker operating process, NCC algorithm and real-time adjustment of ROI region, improving the matching speed and precision, and obtaining the expansionand contraction characteristic parameters of the circuit breaker spring quickly and effectively. Adaptive adjustment of ROI region solves the shortcomings of the NCC algorithm, such as large computational load and slow motion speed. Under the premise of guaranteeing the computational accuracy, the acquisition speed of spring expansion and contraction characteristic parameters is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of circuit breaker fault diagnosis, and in particular relates to an image processing-based testing method for spring expansion and contraction characteristics of a circuit breaker operating mechanism. Background technique [0002] The reliability of high-voltage circuit breaker operation is very important to the protection and control of the power grid. According to statistics, most of the faults of high-voltage circuit breakers are operating mechanism failures, and the spring of the operating mechanism is an important component of the circuit breaker. The circuit breaker operating mechanism determines whether the circuit breaker can be opened and closed normally. The springs of high-voltage circuit breakers are mainly subjected to changing loads or in a state of long-term tension during normal work. Therefore, most of the failure modes are stiffness reduction or fatigue damage. Due to the long-term fatigue...

AI Technical Summary

Problems solved by technology

Some new circuit breakers are equipped with pressure sensors at the bottom of the spring during the manufacturing process, but most circuit breakers can only rely on manual regular inspections, which is not only time-consuming but also labor-intensive

The function of the general spring fatigue testing machine is to calculate the fatigue curve of the spring, which needs to be tested after disassembling the spring of the circuit breaker, and cannot realize the online analysis of the force and deformation state of the spring of the circuit breaker operating mechanism

[0004] In the prior art, the use of circuit breaker opening and closing energy storage spring stiffness decreases will cause the eigenfrequency of the spring to decrease accordingly. The acceleration sensor is used to detect the state of spring energy storage, but it does not leave the scope of contact measurement, and for different circuit breakers needs Different designs of installation equipment are not conducive to popularization

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