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Submersible pump stator winding ground fault how to check processing
Submersible pump stator ground fault check method is: the submersible pump with 500V European megger to measure stator winding (or cable core) of the insulation resistance of the chassis, the value close to zero, said the winding ground. If there is no mega-meter in rural areas, the meter can be blocked (* 1K or * 100 and other large resistance files) direct measurement submersible pump stator winding leads (or cable core) to the chassis (or cable ground wire) Insulation resistance, the value of a large, that submersible pump stator winding insulation is good, submersible pump can continue to use; if its value is small or small, that submersible pump stator winding insulation resistance is low or the stator winding has been grounded; also Can be used to test incandescent lamp inspection, the inspection lamp one end of the stator windings lead wire, the other end of the chassis, through the 220V voltage, such as light bulbs indicate that the stator windings have been grounded. At this time, check the stator winding end of the insulation box near the notch part of the groove insulation without cracking or firing, such as groove edge crack or found coke, the rupture or coke is likely to be the stator winding grounding point. Submersible pump stator winding ground fault approach is: According to the above test results to determine the stator winding ground fault specific location. Usually stator winding grounding often occurs in the bottom of the notch or notch. If the notch part of the ground fault, to distinguish between the grounding method is "virtual connection" or "real connection": virtual connection, in order to identify the fault, can increase the voltage drop virtual connection breakdown, from the spark and smoke traces Judge; real parts can be screened according to the discharge of the insulating parts check out. Locate the notched ground slot, the coil should be heated to about 130 ℃ to soften the insulation, and then with the management board, bamboo and other insulation board knock on the ground insulation, the grounding or scorched insulation insulation clean up, Pad a new insulating mat and apply epoxy glue. If a ground fault occurs in the tank, heat the softened stator windings and remove the damaged coil from the tank for repair or replacement. Insulate the pad tank and re-insert the repaired coil. Ground conditions are serious, you must replace the stator winding to solve.