Multi-core cable insulation automatic measuring device

Abstract

An automatic measuring device for insulation of a multi-core cable comprises a five-way time-sharing switching circuit, a five-way short-circuit conversion circuit and a transfer switch interface circuit. The five-way time-sharing switching circuit outputs a five-way time-sharing switching signal to an input end of the five-way short-circuit conversion circuit. The five-way short-circuit conversion circuit outputs a nine-way time-sharing short-circuit pulse signal for controlling the transfer switch interface circuit to perform time-sharing switching. The nine-way time-sharing short-circuit pulse signal output end of the five-way short-circuit conversion circuit is connected to the input end of the transfer switch interface circuit. The transfer switch interface circuit outputs the insulation resistance between the different cores to the input end of a detection bridge for the insulation resistance between the cores. The output end of the detection bridge for the insulation resistancebetween the cores is connected to a signal detection and amplifier circuit. The output end of the signal detection and amplifier circuit is connected to the input end of a result storage and display circuit. According to the automatic measuring device for the insulation of the multi-core cable, the multi-channel electronic automatic scanning detection, electronic boosting and automatic logic operation are adopted, so that one-time detection without replacement of each cable in the middle can be completed.

Description

technical field

[0001] The invention belongs to the technical field of electronic measurement, in particular to an automatic measuring device suitable for multi-core cable insulation. Background technique

[0002] At present, a hand-operated insulation resistance meter (megohmmeter) is used for measurement, which can only measure the insulation resistance between two wires (single circuit) each time. Two people are required to cooperate during the measurement, and one person is responsible for changing the clip (each five-core cable needs to be switched for 15 times); the other person keeps shaking the watch generator by hand, observing the pointer, reading the resistance value, and judging the test results. The test efficiency is low and the labor intensity is high; Many times. Therefore, using this manual testing method has low testing efficiency, high intensity, cumbersome operation, and easy missed testing. Contents of the invention

[0003] The purpose of the presen...

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