Insulation resistance and grounding resistance comprehensive tester based on programmable power supply

A technology of comprehensive tester and program-controlled power supply, applied in grounding resistance measurement, measurement of resistance/reactance/impedance, instruments, etc., can solve problems such as inconvenience and cumbersome operation, and achieve the effect of reducing the size and facilitating the safety inspection of electrical appliances

Inactive Publication Date: 2012-06-27
NANYANG POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER
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Problems solved by technology

At present, most domestic electrical safety performance testers are single-index testers, and because the test requires large current a...

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  • Insulation resistance and grounding resistance comprehensive tester based on programmable power supply
  • Insulation resistance and grounding resistance comprehensive tester based on programmable power supply
  • Insulation resistance and grounding resistance comprehensive tester based on programmable power supply

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Embodiment Construction

[0014] A comprehensive tester for insulation resistance and grounding resistance based on a program-controlled power supply. The overall design scheme is as follows: figure 1 As shown, the system is divided into 5 parts: program-controlled power supply, signal acquisition and A / D conversion, microcontroller, keyboard and display circuit, alarm and control circuit. The microcontroller switches the working state of the instrument (insulation resistance test state or grounding resistance test state) through the software, and controls the program-controlled power supply to output DC high voltage or AC high current as the test power supply of the electrical appliance under test according to the working state of the instrument. The / D conversion circuit is input to the microcontroller for closed-loop control and resistance measurement.

[0015] The insulation resistance test principle of this system is as follows: figure 2 As shown, the test range is 0.01MΩ-1000MΩ. Since the A / D ...

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Abstract

The invention discloses an insulation resistance and grounding resistance comprehensive tester based on a programmable power supply. The tester comprises the programmable power supply, a signal acquisition and analog/digital converter, a microcontroller, a keyboard and display circuit and an alarm and control circuit, wherein state switchover control software is arranged in the microcontroller. The tester has a basic operating principle that: the microcontroller switches an operating state of the tester, namely an insulation resistance testing state or a grounding resistance testing state, through the state switchover control software, and controls the programmable power supply to output direct current high voltage or alternating current high current serving as a testing power supply of electrical equipment to be tested according to the operating state of the tester; and the testing power supply is input into the microcontroller through the signal acquisition and analog/digital conversion circuit to perform closed-loop control and resistance measurement. The tester works stably, has high testing accuracy and integrates measurement, control and display; and moreover, parameters and alarm points can be independently set, function switch can be realized in an insulation resistance test and a grounding resistance test, and the safety of the electrical equipment is convenient to detect.

Description

technical field [0001] The invention belongs to the technical field of electrical and electronic equipment resistance testing equipment, in particular to a comprehensive testing instrument for insulation resistance and grounding resistance based on a program-controlled power supply. Background technique [0002] Insulation resistance test principle: DC high-voltage power supply generates three kinds of DC voltage signals (250VDC, 500VDC, 1000VDC) to apply to the electrical appliance under test, and detects the current flowing through the electrical appliance under test by measuring the voltage on the sampling resistor and the resistance value of the sampling resistor. Then calculate the insulation resistance value according to the set voltage applied to the electrical appliance under test. Grounding resistance test principle: The current source generates an alternating current of 1.5 times the rated current of the electrical appliance or 25A (choose the larger of the two), a...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R27/20
Inventor 赵岩蒋玉明
Owner NANYANG POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER
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