Need Help in IR Value and Test Lamp Test of Submersible Pump

if you have volt meter you should measure voltage from line to line.anotherway you can measure voltage you will connect in series 2 lamps(220VOLTs) ,then two terminal of lamp put with R ,Y & Y,B & B,R terminal of system voltage,if light lit up with same intensity then ok. if one phase is short with another phase then what will happen?

IF you test 1 lamp with every phase to ground then light will glow with same intensity

,so far my idea ,your motor was working like R=Y(short) and B ,so everytime you have got lamp test result from phase to ground.

I have just shared my idea.In practical case ,normally it happen.

It is possible that your pump is mechanically locking up due to a seized bearing or obstruction and what you are seeing is locked rotor current. If your overloads were set too high or weren't fast enough the motor may have burnt out before the overloads tripped. You may have been luckier the second time.

Also check for moisture ingress.

We have Bimetalic type O/L Relay and set it on min (115 Amp). so at instant heavy current it doesn't trip.

My confusion is when we check IR value of each terminal of motor against the ground it show 0 value (means S.C any wdg with Ground) but when we check it by use of single 60w bulb (230v) and give phase to bulb to any terminal of motor to earth. Bulb doesn't glow (It should be glow in the case of S.C).means winding show O.K in Test Lamp Method ??

Refer manufacturer's cataloque for cooling of motor by distilled water or transformer oil. Also embed a thermistor in motor winding to give an alarm and trip the motor if temp of wdg exceeds the limit

I hope that when the IR is 0, it means that your winding is shorted with the body and taking earth as ground. The Bulb will not light as the current is flowing to the earth and not through the resistance of your bulb. If your winding not get black and still in condition then Please use high temperature liquid varnish to brush over your windings and let it dry .Check your IR values before loading the Motor. Good luck

baywatch

baywatchu@yahoo.com

Please explain to me how this test with the bulb was conducted?

Why did you not just do an insulation resistance test on the motor windings to earth in the first place?

This test that you did with the test lamp, of which I am not familiar with, what was the wattage of the lamp used in the test?

Have a look at the windings from the burnt out motor, they should show some signs of maybe a slow overheating or some other failure.

What kind of water are you pumping, is this bore well dependant on tidal movements, don't forget that most sub-mervisable pumps require water cooling, was it always covered in water?

Cheers

Joe

Problem is sortout We have pulled out submersible pump again.Decoupled the motor-Pump. Motor runs on no load and take 40 amp at noload..but pump's shaft did not moved. When we dismentaled each stage og pump, we found some sand inside the pump's stage no 4 which cogged the pump and motor took very high current.

We also measure meeger value for each terminal of motor with earth (including Flate cable) and It show o value but when we cut the Flat Cable from motor's cable and again measure the IR value of Motor terminal with Earth ( without Flate cable) . It show 12megh ohm !!. We also measure IR value of only Flate cable (without motor) and it show 10 megha ohm !!!!!!!!!!.