Hot water well submersible pump supporting high temperature cable selection

The specifications of the power cable with the hot water well submersible pump motor are determined by the heating and voltage drop of the cable. In addition to the need to control a certain current density to limit the cable temperature, the longer the length of the cable, the greater the voltage drop of the cable, the motor starting performance, performance and reliability of the greater impact. Therefore, the same with the two sets of diving motor, when equipped with hot water submersible pump head different, with different cable length, the requirements of the cable cross-section is not the same. In accordance with GB / T2816 "well submersible pump" standard, the water temperature is 25%, the current rating, the cable voltage drop should be ≤ 5% of the rated voltage. Which can be obtained when the power supply voltage is 380V, different power wells with hot water submersible pump motor with a certain size of the cable when the maximum allowable length. When the power supply voltage is higher and more stable or relatively large capacity of the power supply transformer, the voltage is high, more stable, the submersible pump motor with the same length of the cable to allow the appropriate length of the appropriate length Or with the cable cross-section appropriate to reduce the cable to reduce the cost of configuration) at this time with the submersible motor with the maximum allowable length of the cable, when the well with hot water submersible pump head is very high, the motor down well, with Cable length is longer, and the transformer power supply quality is poor, the motor starting is very difficult: starting current is very large, long cable voltage drop is very large, so that the motor terminal voltage is much lower, the starting current is further increased, the cable pressure drop , The starting torque is lower, resulting in a vicious bang, not only the motor starting difficult, forced start may cause electric = machine winding damage. At this time, in addition to the provisions of the cable should be configured, it is best to increase the transformer supply voltage.