How to Protect Transformer?

During the transportation of large transformers, a three-dimensional impact recorder with a time scale and a suitable range should be installed in accordance with the specifications. After arriving at the destination, the three parties of the manufacturer, the transportation department and the user should jointly check and accept, and the recording paper and escort records should be provided to the user for retention .

When purchasing equipment, the manufacturer should be required to have reliable and sealing measures. For equipment in operation, such as poor sealing, improvement measures should be taken to ensure that the transformer and transformer are prevented from entering water or the air is damp. Strengthen operation inspections, and pay special attention to oil leakage in the negative pressure area of ​​the transformer cooler submersible pump. Prevent accidents caused by casing, lead wire and tap changer. If the distance between the umbrella skirts of the casing is lower than the standard, measures such as adding silicone rubber umbrella skirts should be taken to prevent rain flash accidents.

The bearings of the submersible pump should be E-class or D-class. Bearings without nameplates and no grades are prohibited. The oil pump should be a low-speed oil pump with a speed not greater than 1000r/min. In order to ensure the cooling effect, the air cooler should be flushed with water regularly.

The transformer body and the heavy-watt protection of the on-load switch should be tripped. If the heavy-duty protection needs to be withdrawn, safety measures should be formulated in advance, approved by the chief engineer, and restored within a time limit.

For 220kV and above voltage level substation equipment, infrared imaging temperature measurement inspection must be carried out at least once a year. Take effective measures in terms of technology and management to prevent or reduce the output short circuit of the transformer as much as possible, and improve the operating conditions of the transformer. After the transformer is subjected to a sudden short circuit in the near area, it should be tested for low-voltage short-circuit impedance or the winding deformation by frequency response method, and compared with the original record, before it can be put into operation after judging that the transformer is fault-free.

New or expanded transformers generally do not use water cooling. For special occasions, water cooling systems must be used, and double-layer copper pipe cooling systems should be used. For the single-copper-tube water-cooled transformer currently in normal use, the oil pressure should always be kept higher than the water pressure, and maintenance should be strengthened, and effective operation monitoring methods should be adopted to discover the leakage failure of the cooling system in time.

For thin insulating transformers, technical supervision can be carried out according to general transformer equipment. If serious defects are found, the transformer body should not undergo transformational overhaul, and the replaced thin insulating transformers should not be relocated and installed.

The quality control of the new transformer oil should be strengthened, and the user can select the appropriate oil type according to the operating experience. After the oil arrives at the site, it should be sampled and tested before it can be injected into the equipment. Strengthen oil quality management, strictly implement relevant standards for the oil in operation, and be cautious about the blending of different oil types.

Improve the fire-fighting facilities of transformers in accordance with regulations, and strengthen management, focusing on preventing the expansion of accidents when transformers catch fire.

Prevent problems with casing.

After the bushing is installed in place, it must be left still before being electrified. The static time of 500kV casing shall not be less than 36h, and that of 110~220kV casing shall not be less than 24h.