Voltage insulation monitoring device with function of voltage deviation compensation and voltage deviation compensation method thereof

Abstract

The invention relates to a voltage deviation regulator for an insulation monitoring device, in particular to an insulation monitoring device with the function of voltage deviation compensation. The insulation monitoring device comprises a balance bridge circuit and a compensation circuit; the compensation circuit comprises an anodic compensation triode and a cathodic compensation triode; a collector of the anodic compensation triode is connected to an anode of a direct current bus; an emitter of the anodic compensation triode is connected to a ground wire through a current limiting resistor R3; a collector of the cathodic compensation triode is connected to the ground wire; an emitter of the cathodic compensation triode is connected to a cathode of the direct current bus through a current limiting resistor R4; a base of the anodic compensation triode and a base of the cathodic compensation triode are connected to a changeover switch respectively through a current limiting resistor R5 and a current limiting resistor R6; the changeover switch is connected to a control unit. Deviation of voltage-to-earth of a direct-current system is precisely compensated. The invention further provides a voltage deviation compensation method; current between the collectors and the emitters is smoothly controlled, running safety of the direct current system is guaranteed, and safety hazards are eliminated.

Description

technical field [0001] The invention relates to a pressure difference adjusting device of an insulation monitoring device, in particular to an insulation monitoring device with voltage deviation compensation and a voltage deviation compensation method thereof. Background technique [0002] The safe and reliable operation of DC power supply is very important for the safe and reliable operation of substations. However, due to the large number of DC power supply devices and long power supply cables, faults such as DC grounding often occur in actual operation. Although the DC system runs floating, the single-point grounding does not affect the normal operation of the system, but the fault must be found and eliminated as soon as possible, otherwise, when the second point grounding occurs, the relay or protection device will malfunction and cause serious consequences. At present, DC system insulation and line selection devices are widely used in substations, which have achieved g...

AI Technical Summary

Problems solved by technology

[0003] The DC insulation monitoring device can only detect the insulation degradation of the DC system, but when the DC system has a single-pole or two-pole insulation degradation, if the voltage deviation of the DC system to the ground is too large, even if the insulation resistance to the ground does not decrease to the level of the insulation alarm There will be hidden dangers to the safe operation of the DC system

Images