Notes before use of submersible electric pump for well

(1) check whether the electric motor of submersible electric pump used in the well is filled with liquid as required. If not, make up as required.

(2) before connecting the lead cable of submersible electric water pump with the electric cable in the well, test the insulation resistance of the motor winding to the casing with a high-resistance voltmeter. The value should not be lower than 0.5 megohm in the case of heat and state; otherwise, check at the wiring place and find out the reason. If the insulation resistance value of oil-filled motor is low, the winding should be dried and the insulation oil inside should be replaced.

(3) check the matching size of the motor and the water pump, and control the motor's intermobility at about 2mm. Check and confirm that the electric water pump shaft can rotate when the disc-operated distributor is used.

(4) the insulation and sealing of the cable outer connector should be carefully handled according to the instruction manual before the submersible electric pump goes down the well.

(5) the electric water pump in the well can only be started up and used when it is completely submerged in the water, the temperature of the well water is no higher than 20℃, the pH value (pH) of the water is 6.5 ~ 8.5, the chloride ion content in the water does not exceed 400 ml/l and the sand content does not exceed 0.01%.

(6) used with protection switch. The electric pump works underwater in the well, and its operation is difficult to observe. If the pump fails to operate without protective switch protection, it is very easy to damage the motor winding. Normally, the protection switch can operate within the specified time when the power supply of the submersible electric water pump in the well exceeds the rated current of 1.05 times, and the action time of the protection switch cannot exceed 5 seconds when it is in the braking state with the rated current of 7 times.

(7) ensure that the terminal voltage of the three-phase windings of the electric pump is 342 ~ 418 volts. If the voltage is too high or too low, the normal operation of the pump will be affected, and the motor windings will be damaged if the voltage is too high.

(8) to check and confirm the rated head of the electric pump and the head difference is less than 20% of the rated head, or should be pull down the primary impeller with a height the same as the mouth round collar instead of or turn down out of the water valve, make the head closer to actual rated head lift calculation formula for practical need to lift = downhole head + inoue head + head loss.

(9) when removing and installing submersible electric pumps for Wells, the cables shall not be pulled by force, nor shall the cables be suspended freely. When using, fix the cable on the outlet pipe at intervals of 5 ~ 10 meters.

(10) the diving depth of the electric submersible pump used in the well is usually 2 ~ 5 meters.