Use AC welding machine to dry the damp low-voltage motor of power pumping station
6 Use the AC welding machine to dry the wet low-voltage motor of the electric pumping station. Sheyang County, a state-owned Huaihai farm in Jiangsu Province. 224354 Zhang Wenyuan 1 Overview Since the establishment of the Huaihai Farm in 1952, the electric power irrigation and drainage business has developed rapidly. By the end of 1997, a total of 74 electric power irrigation and drainage pump stations were built at the site with a fixed installed capacity of 5019. According to a pre-news survey in 1996, there were a total of 9 vertical phase squirrel-cage asynchronous motors with 28270 axial flow pumps in the water drainage station. Construction site 1; placed, 1 seems to be too long, which leads to a decrease in the insulation performance of the motor. Before the trial operation after installation, use Megnon to measure the insulation. It is almost 51 for universal resistance. At that time, when the typhoon was coming, the flood control was imminent, the time was short, and the motor was not easy to move, and there was no drying room equipment in the station. At this juncture, we used the existing model 8330 AC welding machine of the sub-farm agricultural machinery station for low voltage The secondary no-load voltage of the power supply is 6070. The working pressure is 30. The flow regulation range is 50450. The low-voltage motor of the electric power pumping station is damp. The heating current is controlled at about 150 people. After 15 drying, the insulation resistance reaches 15 and the absorption ratio is 1.36 greater than 1.3. It is considered that the drying process has met the requirements and is in good condition. In 1997 and 1998, during the pre-flood inspection of other drainage stations of Huaihai Farm, the same method was used to dry the wet motors such as Qiao 148, 180, 380, and 358 into the motor! Have achieved good results. 2 Drying principles and methods use low-voltage current to directly pass through the motor windings to generate copper heat. In order to achieve a drying coffee tide to restore the motor insulation performance of 1. Wiring based on the principle of 烂 drying. The stator winding adopts open angle connection and connects with the secondary coil of the welding machine. Before drying, the secondary output of the welding machine should be adjusted to the minimum value, and then the welding machine should be started. At this time, the voltage at both ends of the winding is below 30, take 1 gear or gear and the incoming voltage 380 or 220 for coarse adjustment, then Adjust the position of the iron core of the welding machine, change the size of the magnetic flux leakage shunt, so as to uniformly adjust the current, that is, fine adjustment by the current adjustment handle of the welding machine. During the adjustment, it is necessary to observe that the low voltage added by the clamp current is 715 of the rated voltage, and it is appropriate to control the drying current in the winding to be 5070 of the rated current of the winding or 1 capacity should have a current of 1 person, depending on the degree of dampness of the motor winding To determine the drying time. When the insulation resistance of the winding reaches the standard, it is stable at 35. That is, after the first drying is finished, it can be put into use. 3 Advantages Rural grassroots pumping stations generally have AC welding machines, which are convenient to use and low in cost. , The welding machine is output through magnetic coupling, which has the function of isolating the transformer, so it is safe to use. The adjustment range of the current is large, and it can be transferred to page 42. Industry information review and double certification. China 1 Industrial Products Certification Committee 0 has organized a system certification center since 1999. It has entered the trial operation stage in December 999. so far. The System Certification Center of the China Light and Power Product Certification Committee has certified many companies in the low-electricity wire and cable power tools industry. More than ten companies in the welding machine industry have also passed the system certification. System certification is a non-mandatory certification. The electrical product safety certification is a netizen-made certification. Whether it is a system certification or a safety certification, it is necessary to verify the factory quality system. China Net Electric Product Certification Committee Electric Welding Machine Testing Station is to enable enterprises to reduce costs. Actively carry out the work of system certification to 03. , After research. On March 14, 2000, it was agreed that the welding machine inspection station should be under the overall control of the system certification center of China Net Electric Product Certification Committee. Carry out system certification. If the safety certification enterprise of the welding machine industry wants to apply for system certification at the same time. It can realize double-issue certification. Yin Xianhua, Chengdu Electric Welding Machine Research Institute, on page 33, drying requirements for various specifications of motors in foot pumping stations. It can be applied to the drying of the fixed rotor of various units of transformers and small hydropower stations, so it has the value of promotion in rural areas. 4 Attentions When drying, it should be noted that the temperature rise of the winding should not exceed its maximum allowable value, generally not more than 7075. Selection of welding machine capacity 5. According to the size of the motor capacity, it can be estimated according to the required secondary current voltage, that is, the insulation resistance is measured once every hour and the winding is recorded. Core temperature and current values. The drying current is adjusted by the connection and input voltage of the welding machine. Generally, the low gear is selected first. Before the voltage 220 is input, the current adjustment handle of the welding machine is placed at the minimum current position, and then fine-tuned according to the requirements. 5 Conclusion is in the process of construction on site. It is a more convenient and safer method to use AC welding machine as a low-calorie power supply to dry the damp motor of small and medium-sized electric pumping stations whose insulation resistance does not meet the standard. It is more practical when there is no drying room or the motor is not easy to move. Therefore, it has promotion value in rural areas. 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