Insulation monitoring method for IT (Isolation Terre) electric system with neutral conductor

A neutral conductor and power system technology, applied in the direction of grounding resistance measurement, dielectric strength test, etc., can solve problems such as insulation fault monitoring

Inactive Publication Date: 2012-06-20
JIANGSU ZHENAN ELECTRIC POWER EQUIP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the insulation monitoring products related to the IT power system can only monitor the insulation deterioration on the phase conductor, and no manufacturer claims to be able to monitor the insulation fault on the neutral conductor of the IT power system.

Method used

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  • Insulation monitoring method for IT (Isolation Terre) electric system with neutral conductor
  • Insulation monitoring method for IT (Isolation Terre) electric system with neutral conductor

Examples

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Embodiment Construction

[0009] As shown in the figure, the IT power system insulation monitoring method with a neutral conductor is connected in series with a DC signal source DC at the neutral point of the IT power system distribution transformer, the voltage is V, and a sampling resistor R is connected in series. A current measurement is performed on the neutral conductor N; assuming an insulation breakdown occurs on the neutral conductor N, R N Significant drop, the DC injection signal along the neutral conductor to ground insulation resistance R N , can form a closed loop, DC current I = When the voltage drop on the sampling resistor R exceeds the set value, the acousto-optic signal alarm can be triggered, and through calculation, the acquisition system based on the industrial computer or single-chip microcomputer will display R N size. DC current I of the present invention = The existence of and greater than a certain threshold has a certain relationship with the architecture of the IT power ...

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Abstract

The invention relates to an insulation monitoring method for an IT (Isolation Terre) electric system insulation with a neutral conductor. The monitoring method comprises the following steps of: bunching a direct current signal source DC (direct current) and a voltage V on the neutral point of a distribution transformer, and connecting a sampling resistor R in series; and when measuring that a direct current I= of the serial sampling resistor R exists and is greater than one threshold, proving that the insulation of one phase is subjected to deterioration, and reacting the variation of the serial direct current I=. According to the invention, a simple method can be used for monitoring an insulation fault on the neutral conductor of an IT electric system, and the specific resistance value of an earthing resistor is obtained.

Description

technical field [0001] The invention relates to an insulation monitoring method, which uses a method of injecting a DC signal source into a neutral conductor to monitor the insulation of an IT power system on a system. technical background [0002] The IT power system (in the power supply industry refers to the common power supply system without a central conductor) must be equipped with an insulation monitoring device to realize the early warning of the first ground fault in the system. At present, the insulation monitoring products related to IT power system can only monitor the insulation deterioration on the phase conductor, and no manufacturer claims to be able to monitor the insulation fault on the neutral conductor of the IT power system. Contents of the invention [0003] The object of the present invention is to propose a method for monitoring insulation of a system by injecting a DC signal source into a neutral conductor. [0004] The technical solution of the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R27/20
Inventor 叶小松王金全邢鸣冯伟唐友怀徐晔杨航崔陈华
Owner JIANGSU ZHENAN ELECTRIC POWER EQUIP
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