Insulation issues with motor of imported shielded pumps
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The insulation resistances of the two existing shielded pumps, which have been in use for 3 years, are 0.16 MΩ and 0.2 MΩ respectively. How much longer can these pumps continue to function? ? What other remedies are there! ! ! ! ! ! ! ! !
Has it been ruled out that the reduced insulation is caused by moisture in the junction box? If only the junction box is damp, it’s relatively easy to deal with!
If the insulation reduction is not caused by the junction box, then there are two possibilities: 1. Whether there are any leakage points in the stator shielding sleeve. If there is a problem with the stator shield, it needs to be replaced. 2. If leak testing of the stator shielding sleeve shows no issues, it is purely due to moisture in the insulation, and drying treatment is required.
How is it implemented specifically? ? ? ? ? ? ? ? ? ? ?
1. Use dry nitrogen to purge the junction box in order to improve its insulation properties. If the insulation of the shielded pump improves overall, no further action is required ； 2. If the junction box has been dried, but the insulation of the shielded pump still does not improve, it is basically because there is a leakage point in the stator shielding sleeve, which results in a decrease in the stator’s insulation. At this point, the only option is to disassemble the shielded pump and replace the shielding sleeve!
It was found that the issue lies with the insulation meter for drive monitoring; I’m not sure if this will affect the operation of the motor! ! ! ! ! ! ! ! ! ! ! ! ! ! -------------------------------------------------------------------------------Dalian Empire Shield Pump
It will not affect the operation of the motor, but it is necessary to check and ensure that the motor’s grounding wire is properly connected, in order to prevent electric leakage and potential accidents.
What are the signs of reduced insulation? I’m not very familiar with this. I just heard from the maintenance technician that if the temperature of our shielded pump’s casing is high, it might be due to reduced insulation…… Please help
It is recommended that the poster check the insulation absorption ratio; a low value for just one insulator does not indicate any problem! !