Hi all,
I'm Nazirie. I have a question about the insulation testing. Actually, i facing a problem with our submersible pump (brand:Grindex). Before we start our operation onboard drilling rig, my trusted technician do the insulation testing on the motor. Without any supervision from someone else, the test conducted wrongly as i saw the picture how he do that thing. 2 test probe of the megger, connected to the end of U1 & U2 with injected volt 1000VDC (Kyoritsu 3007A). Same for all phases.
Before this thing happen, the pump already operate and no problem occur. But when this pump has been backload to onshore, and the testing was conducted, the problem occur. Our personnel that operate the pump reported the pump trip after start about a minutes. The rig electrician clamp the cable and found the ampere 400A.
When i investigate this things, no problem on mechanical parts. I conducted the insulation test and the value shown up around 200-300MOhm. I used same meter, Kyoritsu 3007A with selected range 2000MOhm instead of 20MOhm and 200MOhm range.
The question is, why the Ampere too large. According in the manual, the insulation should more than 1MOhm. Is't 200-300MOhm consider bad insulation? Is't the wrong doing by my technician damage the insulation?
Regards,
I'm Nazirie. I have a question about the insulation testing. Actually, i facing a problem with our submersible pump (brand:Grindex). Before we start our operation onboard drilling rig, my trusted technician do the insulation testing on the motor. Without any supervision from someone else, the test conducted wrongly as i saw the picture how he do that thing. 2 test probe of the megger, connected to the end of U1 & U2 with injected volt 1000VDC (Kyoritsu 3007A). Same for all phases.
Before this thing happen, the pump already operate and no problem occur. But when this pump has been backload to onshore, and the testing was conducted, the problem occur. Our personnel that operate the pump reported the pump trip after start about a minutes. The rig electrician clamp the cable and found the ampere 400A.
When i investigate this things, no problem on mechanical parts. I conducted the insulation test and the value shown up around 200-300MOhm. I used same meter, Kyoritsu 3007A with selected range 2000MOhm instead of 20MOhm and 200MOhm range.
The question is, why the Ampere too large. According in the manual, the insulation should more than 1MOhm. Is't 200-300MOhm consider bad insulation? Is't the wrong doing by my technician damage the insulation?
Regards,