Online monitoring method for motor winding insulation

A winding insulation and insulation monitoring device technology, applied in the direction of motor generator testing, measuring electricity, measuring devices, etc., to achieve the effects of reducing economic losses, accurate detection, and reducing the risk of insulation failure

Pending Publication Date: 2021-04-06
北京国力电气科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention realizes the function of safely and accurately measuring the insulation resistance of the motor winding on-line, thereby solving the difficulty of frequent manual shutdown and insulation detection, and avoiding the economic loss and hidden trouble caused by frequent shutdown and failure to detect the insulation condition of the motor winding in time

Method used

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  • Online monitoring method for motor winding insulation

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Embodiment 1

[0009] Such as figure 1 As shown, an on-line monitoring method for motor winding insulation, the equipment used includes: protective reactance L, relay K, constant voltage DC power supply E, sampling resistor R and insulation monitoring device; protective reactance L is connected to the neutral point outlet of the motor winding Above, the function is to prevent the relay K contact from being disconnected when the motor winding insulation monitoring device fails, causing the neutral point of the motor winding to be grounded for a long time through E and R; the output terminal of the protection reactance is connected to the normally open point of the relay K, The normally open point of the relay K is connected in series with the constant voltage DC power supply E and grounded through the sampling resistor R; the insulation monitoring device is responsible for collecting the exit voltage of the motor winding, which is used to decide when to close the contact of the relay K and col...

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Abstract

The invention provides an online monitoring method for motor winding insulation. Adopted equipment comprises a protection reactor L, a relay K, a constant-voltage direct-current power supply E, a sampling resistor R and an insulation monitoring device. The insulation online monitoring device monitors three-phase voltage signals of a motor winding outgoing line in real time; when it is monitored that the three-phase voltage is lower than a set threshold value, a CPU module in the insulation monitoring device controls a relay K to be switched on through electric shock; direct current is injected into the neutral point loop of the motor winding through the constant-voltage direct-current power supply E; the voltage across the two ends of the sampling resistor R and the known voltage of E are collected through the CPU module, and the insulation resistance value of the motor winding to the ground is obtained through conversion; when the insulation monitoring device detects that the insulation resistance value exceeds the alarm constant value, the fault data is uploaded to the background server after being locally stored and an alarm signal is sent out. According to the invention, the function of safely and accurately measuring the insulation resistance of the motor winding on line is realized, so that the difficulty of frequent manual shutdown insulation detection is solved.

Description

technical field [0001] The invention relates to the field of motor driving, in particular to an on-line monitoring method for motor winding insulation. Background technique [0002] When the motor winding is running, the insulation condition of the motor winding will gradually deteriorate with the service life of the internal materials of the motor winding and the continuous change of the working environment, and the manual inspection of the insulation condition of the motor winding after regular shutdown will not only fail to know the insulation condition of the motor winding in time The changing trend, also caused unnecessary economic losses due to downtime maintenance, often the insulation is seriously reduced, and maintenance is carried out only after serious short-circuit accidents occur, which brings great difficulty to the maintenance of motor windings and produces serious economic losses. Therefore, a motor was invented. The on-line monitoring method of winding insul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
CPCG01R31/346
Inventor 国际平张文瑞孟凡利
Owner 北京国力电气科技有限公司
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