Ultrasonic guided wave detection method for circuit breaker energy storage spring

Abstract

The invention relates to the technical field of non-destructive testing of electrical equipment, in particular to an ultrasonic guided wave testing method for an energy storage spring of a circuit breaker. The present invention adopts the negative square wave excitation ultrasonic flaw detector and the ultrasonic guided wave transducer with the composite material to make the piezoelectric wafer, and its combination performance is excellent, which provides a good solution for detecting the energy storage spring of the circuit breaker whose total length is 3500mm-5000mm Sufficient sensitivity margin and signal-to-noise ratio, the present invention adopts a hand-held detection device, which makes it possible to detect in the narrow gap between the energy storage spring and its shell, by making ultrasonic contrast test blocks and sensitivity lines, the memory of the energy storage spring The position and size of the defects are calibrated. The invention can quickly and efficiently detect the defects existing inside and on the surface of the energy storage spring of the circuit breaker, and evaluate the position and size of the existing defects according to the reflected signal in the A-type display of the ultrasonic guided wave flaw detector.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing of electrical equipment, in particular to an ultrasonic guided wave testing method for an energy storage spring of a circuit breaker. Background technique [0002] With the popularity of small and medium-sized substations in my country, the application of circuit breaker energy storage springs in my country's power grid system is becoming more and more extensive. During the operation of circuit breaker energy storage springs, there will be coil spring fatigue and aging over time. Small cracks in the coil spring develop into coil spring breakage accidents from time to time, which brings great safety hazards to the normal operation of electric equipment. But so far, power grid companies can only intensify regular inspections for the problems that are prone to occur in the energy storage springs of such circuit breakers, or adopt power outage visual inspections to solve problems when e...

AI Technical Summary

Problems solved by technology

Visual inspection can only find large defects on the surface of the energy storage spring, but visual inspection cannot find the quality problems inside the energy storage spring. Therefore, the energy storage spring of the circuit breaker often fails, leading to power outages and other operating accidents. occur

[0003] The shape of the energy storage spring of the circuit breaker is a multi-turn spiral belt, the material is non-alloy spring steel 65Mn, the thickness range is between 6mm-15mm, and the total length is generally between 3500mm-5000mm. The traditional ultrasonic shear wave detection method can be found in the energy storage spring. The existing crack defects cannot travel such a long distance under the premise of ensuring the detection sensitivity, and the ultrasonic shear wave probe needs to be detected at different ring positions. The energy storage spring is installed in the protective box, and the detection position is very limited. Unable to move back and forth along the ring position, the traditional ultrasonic shear wave detection method cannot fully cover the detection area of ​​the energy storage spring, and cannot complete the quality supervision of the circuit breaker energy storage spring

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