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

An insulation monitoring device and voltage deviation technology, which is applied in the direction of circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problem of excessive voltage deviation of the DC system to the ground and hidden dangers left in the safe operation of the DC system, etc. problems, to achieve the effect of ensuring safe operation and eliminating potential safety hazards

Active Publication Date: 2015-04-08
SHANDONG ZHIYANG ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 th

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1:

[0026] Such as figure 1 As shown, the insulation monitoring device with voltage deviation compensation of the present invention includes an insulation monitor and a balance bridge circuit, as well as a compensation circuit and a control unit. The compensation circuit includes a positive compensation triode T1 and a negative compensation triode T2, and a positive compensation triode T1 The collector is connected to the positive KMI+ of the DC bus, the emitter is connected to the ground through the current limiting resistor R3, the collector of the negative compensation transistor T2 is connected to the ground, and the emitter is connected to the negative KMI- of the DC bus through the current limiting resistor R4, positive and negative. The base of the compensating transistor is connected to the switch K through the current-limiting resistor R5 and the current-limiting resistor R6, and the switch K and the insulation monitor are connected to the control unit M...

Example Embodiment

[0030] Example 2:

[0031] This embodiment provides a voltage deviation compensation method based on Embodiment 1, including the following steps:

[0032] In the first step, the insulation detection device transmits the collected DC bus positive-to-ground resistance R+ and DC bus negative-to-ground resistance R- to the control unit;

[0033] In the second step, the control unit judges the resistance of the DC bus positive to ground resistance R+ and the DC bus negative to ground resistance R-. If the control unit detects that the DC bus positive to ground resistance R+ decreases, the control unit M controls the switch K Connect with the current limiting resistor R6, adjust the output voltage V2 of the digital-to-analog converter DAC, control the current through the current limiting resistor R4 to be equal to the current through the resistor R+, if the control unit M detects the DC bus negative resistance to ground R -Lower, the control unit M controls the switch K to connect with th...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): H02H3/26G01R31/12
Inventor 张万征刘国永徐学来许克
Owner SHANDONG ZHIYANG ELECTRIC
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