What checks should be conducted before operating a dry-type transformer?

The pre-operation inspection of dry-type transformers is a crucial step to ensure the equipment operates safely and stably. The following are the detailed inspection items and steps:

Content

●Inspection of Component Tightening

Before operating the transformer, it is essential to conduct a thorough inspection of all components to ensure there are no loose parts. Even if no looseness is apparent, all bolts and connections should be re-tightened. This is necessary because vibrations during transportation and installation may cause parts to loosen, potentially affecting the equipment's normal operation and safety.

●Ventilation System Inspection

The ventilation openings of dry-type transformers are critical for heat dissipation and proper operation. When inspecting the ventilation system, pay attention to the following:

●Dust Removal: Check for the accumulation of dust or debris at the ventilation openings. If dust is present, it should be removed immediately to ensure unobstructed airflow. Accumulated dust can hinder heat dissipation and cause the equipment to overheat.

●Ventilation Direction: Carefully check the rotation direction of the fan. Normally, the airflow should enter the coil from the bottom. If the airflow direction is reversed, it indicates that the fan is operating in reverse and should be adjusted according to the manufacturer's instructions.

●Auxiliary Equipment Inspection

The proper functioning of auxiliary equipment is vital for the safe operation of dry-type transformers, particularly temperature control devices and power fans:

●Power Fan: Ensure that the power fan operates correctly. Verify that the fan wiring is correct and that the fan starts and runs properly at the rated voltage.

●Temperature Control Devices: Ensure the wiring and settings of temperature control devices are accurate. Check that the temperature sensor is properly installed to monitor the transformer's temperature accurately.

●Electrical Connection Inspection

The quality of electrical connections directly affects the performance and safety of dry-type transformers. When inspecting electrical connections, consider the following aspects:

●Terminal Connections: Check that terminal connections are secure and that there are no loose wires.

●Insulation Condition: Inspect the insulation of electrical connections to ensure that there is no damage or aging of the insulation material.

●Grounding: Ensure that the transformer’s grounding connections are solid and that the grounding resistance meets relevant standards.

●Test Run Inspection

After completing all the above checks, conduct a test run to verify the performance parameters of the equipment.

During the test run, observe the following:

●No-Load Test Run: Start with a no-load test run to observe whether the transformer's parameters, such as voltage, current, and temperature, are normal.

●Incremental Loading: If the no-load test run is satisfactory, gradually increase the load and observe the transformer’s performance under different load conditions.

●Documentation and Reporting

During the inspection and test run, maintain detailed records, including any identified issues and the corresponding corrective actions. Prepare an inspection report to provide a reference for the equipment’s subsequent operation and maintenance.

In summary

The pre-operation inspection of dry-type transformers is a systematic process that requires a comprehensive and meticulous examination of various aspects, including component tightening, ventilation systems, auxiliary equipment, electrical connections, and test runs. This not only ensures the safe and reliable operation of the transformer but also extends the equipment's service life and enhances the overall efficiency of the power system. In practice, inspections should be conducted strictly according to relevant standards and instructions to ensure that no detail is overlooked.

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LuShan, est.1975, is a Chinese professional manufacturer specializing in power transformers and reactors for 49 years. Leading products are single phase and three phase isolation transformers, electrical transformer, distribution transformer, step down and step up transformer, low voltage transformer, high voltage transformer, control transformer, toroidal transformer, R-core transformer; DC inductors, AC reactors, line and load reactor, chokes, filtering reactor, and intermediate, high-frequency products. Our power transformers and reactors are widely used in 10 application areas: rapid transit, construction machinery, renewable energy, intelligent manufacturing, medical equipment, coal mine explosion prevention , excitation system, vacuum sintering(furnace), central air conditioning.

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