Overhaul of dry-type power transformers

The maintenance of dry-type power transformer is an important measure to ensure its normal operation and prolong its service life. The following are the main contents of dry-type power transformer maintenance:

Transformer visual inspection: Check whether the appearance of the transformer is complete and whether there is any obvious damage or deformation on the surface. Check whether the signs, nameplates, warning signs, etc. on the transformer are clearly visible. Check whether there is oil leakage or electricity leakage around the transformer.

Insulation system inspection: Check whether the insulating pads, separators, insulating oil, etc. of the transformer are intact, and replace damaged parts in time. Check the windings, leads, terminals, etc. for looseness and corrosion.

Temperature measurement and monitoring: Regularly measure the operating temperature of the transformer to ensure that it is operating within the normal range. Consider using a temperature monitor to monitor the temperature changes of the transformer in real time and detect abnormalities in time.

Lubrication system inspection: check the oil level and oil quality of the lubrication system, and replenish or replace the lubricating oil in time. Clean the filter screen and cooler of the lubrication system to ensure that they are unblocked.

Insulating oil testing: Regularly test the insulating oil of the transformer to check its electrical performance, pollution degree and moisture content. According to the test results, choose appropriate treatment measures, such as replacing the oil cup, adding desiccant, etc.

Over-current protection and relay system inspection: Check the operation status of the transformer's over-current protection device and relay system to ensure its reliability. Test and correct the operating time and operating characteristics of the protective device to ensure that it meets the requirements.

Air circulation system inspection: Check the air circulation system of the transformer, including ventilators, air ducts, filters, etc., clean and replace. Ensure the smooth flow of air, good heat dissipation, and prevent the transformer from overheating.

Fire protection system inspection: Check the operation status of the fire protection system, including fire alarms, fire extinguishers, firewalls, etc. Clean and overhaul fire protection equipment to make sure it is working properly.

Grounding system inspection: Check the grounding system of the transformer, including the connection of grounding resistors and grounding electrodes. Test the grounding resistance value of the grounding system to ensure that it meets safety requirements.

Commissioning and testing: After the overhaul is completed, commissioning and testing are carried out to ensure that the performance of the transformer meets the design requirements. Including insulation resistance test, withstand voltage test, partial discharge test, etc.

Maintenance records: There should be detailed records during the maintenance process, including inspection items, abnormal conditions, maintenance measures, etc. Analyze the operation status and maintenance history of the transformer according to the records, and provide reference for future maintenance.

The above are the main contents of dry-type power transformer maintenance. Regular maintenance and repair can ensure the safe and reliable operation of the transformer and prolong its service life. In order to ensure the quality of overhaul, it can be operated according to relevant standards and specifications, and overhauled by professionals.