High-precision insulation resistor detection circuit

Abstract

The invention relates to a high-precision insulation resistor detection circuit. The high-precision insulation resistor detection circuit comprises an insulation detection module and a voltage division module which are connected in series, wherein the insulation detection module comprises multiple groups of insulation resistor detection units connected in parallel; each insulation resistor detection unit comprises a battery, a detection circuit and a diode which are connected in series; each detection circuit comprises a first insulation resistor, a second insulation resistor, an inductor device and a button switch, the first insulation resistor and the second insulation resistor form a series circuit, and the inductor device and the button switch are connected in parallel with the seriescircuit; the voltage division module comprises a voltage division circuit and a grounding circuit; and the voltage division circuit comprises a first switch, a first voltage division resistor, a second voltage division resistor and a third voltage division resistor which are sequentially connected in series. By using the high-precision insulation resistor detection circuit, the problems of inaccurate resistor value detection, false alarm, large detection error and complex calculation of an insulation resistor detection circuit in the prior art are solved.

Description

technical field [0001] The invention relates to the field of insulation monitoring devices, in particular to a high-precision insulation resistance detection circuit. Background technique [0002] The DC systems of power plants and substations provide working power for control and signal systems, relay protection and automatic devices, etc., which are crucial to ensuring the continuous and safe operation of power plants and power stations. This requires DC systems and their power supply networks to have higher reliability and continuous power supply capability. As one of the measures to improve the continuous power supply capability, the DC system works in the "floating" operation mode, which is reflected in the occurrence of a ground fault, and the normal operation of the system will not be affected, but if the potential hazard exists and the second ground fault occurs at the same time It may endanger the continuous operation of the system, and continuous monitoring of its...

AI Technical Summary

Problems solved by technology

[0004] However, there are many problems in the current insulation resistance detection circuit, such as: complex detection circuit, inaccurate detection of insulation resistance resistance, false positive results, large error in detection results, complex calculation formulas, and excessive use of processor resources

[0005] Moreover, the existing insulation resistance detection circuit cannot judge whether its own detection circuit is working normally, and it is easy to make the result false positive.

These problems will affect the reliability of the insulation monitoring device. If the potential hazards cannot be solved, it will bury a huge hidden danger for the follow-up work.

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