High Voltage Motor Repair

High-voltage motors can be used in coal mines, mining fields as energy boosters, steel mills for rolling mill energy support, sugar mills for pressing machines, fans for supporting use, water pump drives, hoists, etc. The power of the high-voltage motor is relatively large, which means that the high-voltage motor as a large-scale motor has a large volume, a large weight, and the transportation process is troublesome, so it must be hoisted by professional upgrading equipment. As a high-voltage device, the high-voltage motor itself requires high insurance standards. Therefore, the high-voltage motor presents many complex problems, and the test failure is relatively difficult. There are also certain standards for the disassembly, installation and debugging of the high-voltage motor, and the CCC standards must be strictly implemented. CE standard, otherwise it is easy to cause failure problems. From the technical level of motor repair personnel, the company's maintenance equipment (such as high-voltage dipping equipment in insulation) requirements, individual motor maintenance companies cannot undertake repair and maintenance services for such large-scale high-voltage motors. Without technical requirements, for example, high-voltage motor insulation needs to use diimide, monoimide, weak double wire and other wire-wrapped flat wires according to the voltage level, and the materials are special. There is also a high demand for high-voltage motors in dynamic balancing. After the repair of the high-voltage motor, it is necessary to do the no-load load test of the whole machine. Some motor repair companies cannot provide this premise.
When the motor is re-wound or the motor bearings or other accessories are replaced, the motor repair work is not over, and the motor needs to be checked and tested, which is an important part of the motor repair in the test. Due to different foreign power grids, high-voltage motors also have voltage levels of 3300V and 6600V. The high-voltage motor is generated because the motor power is proportional to the product of the voltage and the current. Therefore, when the power of the low-voltage motor increases to a certain extent (such as 300KW/380V), the current is limited by the allowable bearing capacity of the wire, and the cost is too high. It is necessary to achieve high power output by increasing the voltage.
After the motor is repaired, use a megohmmeter to measure the outer casing and leads of the motor to check if there is any leakage, and there is no problem if it is more than 5 megabytes.
Second, use a millihenry meter to measure the inductance of the three sets of winding motors. The winding error of the three sets of motors should not exceed 1 millihenry (depending on the size of the motor). If there is no millihenry meter, turn on the power and measure with a clamp meter. The three-phase no-load current of the motor, the three-phase current error does not exceed 5A (depending on the size of the motor).
Third, measure the no-load current of the motor.
Fourth, check whether the bearing is loose or lack of oil before installation. Due to different foreign power grids, high-voltage motors also have voltage levels of 3300V and 6600V. The high-voltage motor is generated because the motor power is proportional to the product of the voltage and the current. Therefore, when the power of the low-voltage motor increases to a certain extent (such as 300KW/380V), the current is limited by the allowable bearing capacity of the wire, and the cost is too high. It is necessary to achieve high power output by increasing the voltage.
Fifth, the last is the whole machine test. After the motor is repaired, run the motor with load for 1 hour to check the temperature of the motor casing. It should be within 90 degrees, or you can touch the motor casing by hand for more than 10 seconds. If you feel the temperature rise is not unusual.
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