Comprehensive tester of programmable power supply insulation resistance and earthed resistance

Abstract

The invention discloses a comprehensive tester of programmable power supply insulation resistance and earthed resistance, which comprises an insulation resistance testing circuit, an earthed resistance testing circuit, an A / D (Analog / Digital) converter, a microcontroller, a keyboard and a display device; the signal output ends of the insulation resistance testing circuit and the earthed resistance testing circuit are connected with the A / D converter; the A / D converter is connected with the microcontroller through a signal transmission wire; and the keyboard and the display device are connected with the microcontroller through interfaces. The comprehensive tester can better realize the comprehensive testing of the power supply insulation resistance and earthed resistance of an electric device, and has the advantages of being small in volume, convenient to carrying and use, stable in operating process, large in measuring range, high in testing precision, reliable in performance, simple and convenient in operation; and the comprehensive tester can realize the unitization of measuring, controlling and displaying.

Description

technical field [0001] The invention belongs to the technical field of electrical detection, in particular to a program-controlled power supply insulation resistance and grounding resistance comprehensive tester. Background technique [0002] Electrical safety is the basic performance requirement for the normal operation of electrical equipment, and its basic indicators include: insulation resistance, grounding resistance, leakage current and withstand voltage strength. Among them, insulation resistance refers to the resistance value between two parts of conductors separated by insulating materials, and its value reflects the insulation strength between two parts of conductors; grounding resistance refers to the contact between the accessible metal body of electrical equipment and the lead-out of the equipment. It is a parameter that has a direct impact on human safety, and it is generally tens of milliohms. At present, most of the domestic electrical safety performance tes...

AI Technical Summary

Problems solved by technology

At present, most of the domestic electrical safety performance testers are single-index testers, and due to the requirement to generate large current and high voltage, the signal power supply system often uses traditional analog circuits for power supply, so it is heavy and inconvenient to operate, and the test accuracy is relatively poor.

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