Insulation resistance detection circuit, detection device and detection method

Abstract

The invention relates to a detection circuit, a detection device and a detection method of insulation resistance. The detection circuit of the insulation resistance comprises a resistance module, a first detection module and a second detection module, wherein the first detection module comprises a first voltage detection sub-module and a first detection resistor sub-module which are connected in parallel; the second detection module comprises a second voltage detection sub-module and a second detection resistor sub-module which are connected in parallel; each of the first detection resistor sub-module and the second detection resistor sub-module comprises an adjustable resistor module; the direct-current positive interface is connected with the ground interface through the first detection module and the resistance module, and the direct-current negative interface is connected with the ground interface through the second detection module and the resistance module; the first detection module is used for acquiring a direct-to-ground sampling voltage value; and the second detection module is used for obtaining a negative ground sampling voltage value. Thus, by changing the resistance value of the adjustable resistance module, the obtained sampling voltage value can be located in the linear region of the operational amplifier chip, the sampling error is effectively reduced, and the detection precision is improved.

Description

technical field [0001] The present application relates to the technical field of circuit detection, in particular to an insulation resistance detection circuit, detection device and detection method. Background technique [0002] The insulation resistance of the induction power supply is an index for judging the insulation performance of the DC bus to the ground. The aging or even damage of the power cables and other insulating materials often greatly reduces the insulation strength, which in turn affects the safety of personnel and the normal operation of low-voltage electrical equipment. Therefore, the detection of induction The insulation performance of power supply is of great significance to ensure the safety of operation and maintenance personnel and the normal operation of electrical equipment. [0003] In related technologies, the current mainstream insulation resistance detection method is the unbalanced resistance method. By setting a sampling resistor between the ...

AI Technical Summary

Problems solved by technology

[0004] This application provides a detection circuit, detection device and detection method of insulation impedance, which are used to solve the technical problems in the prior art that the calculation error of the insulation resistance of the induction power source is large, and the accuracy and reliability of the protection cannot be guaranteed.

Images