Submersible pump maintenance 1. Electrical (1) often check the submersible pump operating voltage and current. Use the voltmeter to measure the three-phase voltage should be basically the same, and in the 340 ~ 420V, with a clamp ammeter to measure the three-phase current should be basically the same, and is 0.5 to 1 times the rated current. (2) Regularly check the submersible pump on the ground of the thermal insulation resistance. In normal continuous operation after 4 ~ 6h, stop using megger to measure the motor winding insulation resistance should be> 0.5MΩ. Submersible pump for a long time to disable, should also be used before such a check. (3) Check the sensitivity of the thermal relay and the work of other protective devices before starting the machine. (4) Check the cable for damage. For the oil-immersed submersible pump, pay attention to the damaging effect of pump oil on the rubber insulated cables. 2. Mechanical (1) often check the submersible pump mechanical seal situation. Open the hole screw, release a small amount of oil, such as oil contains moisture, then the grinding block (or under the grinding block) seal has leaked, the seal box should be replaced and add a new cooling oil. If there is a lack of oil or bad oil in the oil hole, fill it with oil (No. 5 or No. 10 mechanical oil, sewing oil or transformer oil) or replace with new oil. (2) For submersible pumps with new or changed grinding blocks, the sealing plug of water should be opened after 50 hours of use to check the leakage of oil (water). (3) Check the vibration of pump motor Synchronous speed is n0 = 3000r / min , 1500r / min, 1000r / min, 750r / min of the motor, the required vibration values ​​correspond to δ ≤ 0.06mm, 0.1mm, 0.13mm, 0.16mm. (4) Regular inspection of submersible pump bearings. To see if the bearings are short of oil, whether to run the inner ring or run the outer ring, the bearings should be replaced (for the water-filled electric pump bearings is best to be replaced once a year).
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