2500kva oil type distribution transformer

Daily inspection of 2500kva oil type distribution transformer

1. Check the oil level of the transformer. Some transformers have two oil conservators: one for the main body and one for the on-load tap-changer. According to the oil level-oil temperature comparison table, the oil level should be in a reasonable position, neither too high nor too low. If the oil level is too high, as the load further increases or the external temperature rises, it may exceed the maximum oil level. At this time, the expansion of the insulating oil is hindered, pressure builds up inside, and the pressure relief valve may actuate. A too-low oil level is more harmful. If the oil temperature drops further, oil shortage in the main body may occur, with part of the transformer body exposed above the oil surface, directly endangering the safe operation of the transformer and potentially causing insulation breakdown and accidents.
2. Check the breather, including the bubble rate in the oil cup, the color change of the desiccant, and whether the valve position on the breather pipeline is correct. The breather is a key component to ensure the free expansion of transformer oil. If freezing blockage occurs or the valve remains closed after maintenance, it may cause oil shortage in the main body, actuation of the light gas relay, or operation of the pressure relief valve.
3. Compare the oil surface temperature and winding temperature gauges with the remote transmission measurement values to check if the local and remote values are consistent, with a difference not exceeding 5℃.
4. Check the oil level of the bushing current transformer (CT). The oil level indicator of the CT should be at 1/2 to 2/3, neither too high nor too low.
5. Check the cooler and its control cabinet. Inspect the control box to ensure both power supplies are energized, with one in operation and the other on standby. The number and position distribution of the used coolers should be reasonable. The motor-fan should operate stably without abnormal noise, and the oil flow indicator should show correctly (indirectly indicating that the oil pump is operating normally). Measure the temperature of switches, contactor, and high-current connection terminals in the cooler to prevent electrical fires caused by poor contact. Use an infrared imager to measure the temperature of the radiating fins to check for unopened oil circuits in the cooler.
6. Compare the oil surface temperature and winding temperature gauges with the remote transmission measurement values to check if the local and remote values are consistent, with a difference not exceeding 5℃.
7. Check if the transformer lead connection terminals have overheating phenomena.
8. Check the operating sound of the transformer, which should be a uniform humming sound with no obvious abnormalities compared to the usual sound.
9. Check the on-load tap-changer control box for no condensation, and ensure the indicated gear is consistent with the remote transmission.
10. Check the pebbles at the bottom of the transformer and the transformer oil pipelines for oil leakage.
11. Check that there are no obvious changes in each gas component on the transformer online chromatographic detection system and that there is an alarm.
12. Check that the transformer protection device is operating normally with no alarm signals.
13. Measure the current values of the iron core and clamp lead-out wires, which should not have obvious changes and should not exceed 0.1A.

 2500kva oil type distribution transformer Technical Parameters

2500kva oil type distribution transformer Production Process

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