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Operation management of oil-immersed distribution transformer

Author:ZTELEC   Update time:2018-09-03 16:42:56
In order to ensure the normal operation of the oil-immersed distribution transformer, it is necessary to strengthen the operation and management of the distribution transformer, do a good job in the operation and maintenance of the transformer, analyze the phenomenon in the operation of the transformer, determine the cause and possible accidents, and take measures to eliminate hidden dangers. To ensure the safe operation of electricity and transformer operation.

The oil-immersed transformer is the main electrical equipment for power users, and its safe operation has a direct impact on the reliability and safety of users. In order to ensure the normal operation of the distribution transformer, it is necessary to strengthen the operation and management of the distribution transformer, do a good job of monitoring the operation of the transformer, analyze the abnormal phenomena occurring in the operation of the transformer, determine the cause and possible accidents, and take measures to prevent accidents. happened.

1. The importance of normal operation of distribution transformers

The distribution transformer is the source of the user's electrical energy, and its operating status is directly related to whether the power user can obtain reliable and continuous power consumption. In the event of an accident in the transformer, the power is cut off, resulting in production suspension, inconvenient life, damage to facilities, and heavy chain reaction, causing large-scale power outages, and direct and indirect economic losses. Therefore, strengthen the operation and management of the transformer, monitor the operation of the transformer, ensure the healthy operation of the transformer, take abnormal conditions, take measures, deal with it in time, effectively prevent the conversion of the fault state, and operate the transformer according to the operating data of the transformer. Analyze, determine the health of the transformer, determine whether it is necessary to repair, reduce or avoid the loss caused by the development of transformer failure, and improve the reliability of power transformer operation. Guarantee power supply.
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2. Detection before transformer operation

In order to ensure the safe operation of the oil-immersed transformer, the transformer must be inspected on site before operation. The main contents are as follows:

(1) Whether the oil level gauge on the oil pillow is intact, the oil level is clear and on the oil level line that matches the ambient temperature.

(2) Whether the cover, casing, oil level gauge, oil drain valve, etc. are well sealed and there is no oil leakage.

(3) Whether the explosion-proof membrane of the explosion-proof pipe (safe air passage) is intact, and whether the moisture absorber of the respirator is invalid.

(4) Whether the grounding of the transformer's outer casing and the low-voltage side neutral point is firm and reliable, and the grounding resistance meets the requirements.

(5) Whether the transformer first and second outlet bushings and the connection with the wires are good, and the phase color is correct.

(6) Measuring the insulation resistance and DC resistance of the transformer

If all the above inspections are qualified, firstly put the transformer into the air (without load), check whether the electromagnetic sound is abnormal, and measure whether the secondary side voltage is balanced. If the balance indicates that the oil-immersed distribution transformer is normal, there is no inter-turn short circuit, and the transformer can be loaded normally. run.
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