An experimental platform for detecting the stress relaxation of closing spring of high voltage circuit breaker

Abstract

The invention discloses a testing table for detecting the relaxation of high voltage breaker closing spring stress, which comprises a substrate, a spring fixing plate, a spring moving platform, a screw rod fixing plate, a hand wheel and a speed reducer. The spring fixing plate and the screw rod fixing plate are fixedly arranged on the substrate; the spring moving platform is capable of sliding in the track of the T shaped groove arranged on the substrate through a T shaped sliding block. The spring fixing plate is provided with a plurality of pressure pulling sensors. The spring moving platform is provided with corresponding suspension ring screw nails. The to-be-tested springs are placed between the suspension ring screw nails and the pressure pulling sensors. The spring moving platform is connected with the screw rod fixing plate through a leading screw and nut mechanism; the screw rod fixing plate is provided with a clamping groove. The transmission screw rod of the leading screw and nut mechanism is provided with a clamping ring cooperating with the clamping groove. The hand wheel is connected to the end part of the transmission screw rod through the speed reducer. Through the hand wheel and the speed reducer, great torque is provided to the transmission screw rod so that the leading screw and nut mechanism can provide strong pulling force to the spring moving platform and that a plurality of the to-be-tested springs are tested at the same time.

Description

technical field [0001] The invention relates to an experiment platform for detecting spring stress relaxation, in particular to an experiment platform for detecting the relaxation of closing spring stress of a high-voltage circuit breaker. Background technique [0002] High voltage circuit breaker is one of the most important equipment in the power system, it plays two roles in the power system: control and protection. Therefore, circuit breakers play a vital role in the safe and stable operation of the power grid. [0003] The mechanical characteristics of high-voltage circuit breakers are one of the important indicators to measure the reliability of circuit breakers. Among them, the closing spring is the power source of the closing movement of the high-voltage circuit breaker mechanism, and the reliability of its mechanical performance is an important factor to ensure the performance index and normal operation of the high-voltage circuit breaker. Under normal circumstanc...

AI Technical Summary

Problems solved by technology

Under normal circumstances, when the closing spring of a high-voltage circuit breaker works in a stretched (compressed) state for a long time, stress relaxation will inevitably occur. Stress relaxation failure is one of the main failure modes of spring components. After the spring stress relaxes, it will cause The high-voltage circuit breaker cannot be closed within the specified time, resulting in a very violent electric spark during the closing process, which brings huge potential safety hazards

In engineering practice, the closing spring of a high-voltage circuit breaker is usually relatively large in stiffness, and it is difficult to pull the closing spring apart and ensure its stretching length. Therefore, the existing test bench generally uses a smaller spring as the test The object is to do stress relaxation experiments, and then according to the experimental data, through the method of analogy analysis, qualitatively describe the stress relaxation of the closing spring of the high-voltage circuit breaker, but cannot quantitatively describe the stress relaxation of the closing spring of the high-voltage circuit breaker

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