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What technologies need to be mastered in the process of electric power maintenance



Due to the thermal load and mechanical load effects of electrical maintenance, the defects of the current maintenance system are also exposed. It is imperative to explore, introduce and learn advanced maintenance methods and maintenance management systems. Regular maintenance is a planned maintenance characterized by time rules. Through experience, the average defect rate of equipment is known, the maintenance cycle is determined, and maintenance is stopped within the corresponding range.

When inspecting circuit defects in electrical maintenance, use testing instruments to find and identify detailed defective parts. After confirming that there is no bad contact defect, check the running contact between the line and the machine to prevent misjudgment. If there is no backup transformer, if it turns out that the transformer trip is not caused by internal defects, then according to the derating instructions, find out the maintenance actions and external phenomena when the transformer tripped.

The project content, cycle and construction period of major and minor repairs shall be implemented in accordance with the regulations of different countries promulgated by the power authority. The equipment is regularly and comprehensively repaired. After the repair work is completed, it is necessary to reduce the high-frequency and high-voltage pulses through the ferrite output transformer. In addition, during the power maintenance process, quality inspectors need to come to the site for inspection, and sign on the quality plan sheet for confirmation after meeting the installation quality regulations. After the operation of the power equipment is completed, it is required to process and destroy the operation ticket. After the operation practice, the operator checks and eliminates the relevant protection countermeasures.

In the process of electric power maintenance, it is sometimes necessary to overhaul the transformer. If the transformer is found to be loose during the overhaul, it should be removed, and the contact surface should be gently filed with a fine flat file. If there is no unevenness around the device by hand, before maintenance and disassembly of the power supply, the defective components around the device should be arranged neatly, and the device can be disassembled only after the internal defect is considered. Otherwise, the device may get worse and worse after disassembly. Electrical inspections are stopped only after the mechanical parts are admitted to be free of defects.

If it is caused by overload, external short circuit or secondary circuit maintenance installation defect, then the transformer can be put into operation again without external observation; otherwise, it is necessary to stop inspection and test to find out the cause of transformer trip. If the transformer shows signs of internal defects, stop the internal inspection, make the transmission part smooth, and use a 2500V megohmmeter to measure the insulation resistance of the transformer's upper and lower voltage coils (to ground and between phases). 20mΩ, and the low-voltage side is greater than 13mΩ. If it is loose before inspection, remove the screw and gently file the contact surface with a thin flat file. If the high-voltage side of the transformer is equipped with a high-voltage load switch.