1. Avoid water and air entering the transformer
(1) The transformer should be protected from water ingress and moisture during operation, and it is necessary to seal well the cap of the casing item, the top of the storage phase, the bushing pipe and its connecting pipes. If necessary, a leak detection test should be carried out, and if the insulation has been found to be damp, corresponding measures should be taken in time.
(2) The overhauled transformer should be vacuum treated and oiled according to the instructions, and the vacuum degree and oil inlet speed should meet the requirements.
(3) When filling oil from the oil conservator or filtering oil with electricity, the stagnant water of the oil conservator should be drained first, and the oil should not be imported from the lower part of the transformer to avoid moisture. Air or impurities at the bottom of the tank enter the transformer body
(4) When the gas relay sends out a light gas action signal, the gas relay should be checked immediately, and the gas sample should be taken for inspection in time to determine the gas composition, and the oil sample should be taken for chromatographic analysis to find out the cause in time and side by side
Except.
(5) Check whether the silica gel of the respirator is normal regularly to ensure that it is dredged
(6) Delixi transformer outage time more than 6 months, before re-operation, should be carried out in accordance with the requirements of the pre-test procedures.
2. Avoid foreign matter from entering the transformer
(1) When the transformer replaces the cooler, it is necessary to repeat the oil washing pipeline and cooler with qualified insulating oil until the oil test after the washing is qualified and there is no foreign matter.
(2) It is necessary to avoid the silica gel in the oil purifier equipment from entering the transformer. The filter should be reviewed regularly and the adsorbent replaced.
(3) Strengthen the timing to check whether the indication of the oil flow relay is normal. Check whether the oil flow relay baffle is damaged and falls off
3. Avoid transformer insulation damage
(1) When replacing insulating parts for maintenance, materials and components that meet the requirements of the manufacturer and are qualified for inspection should be selected and dried.
2) It is strictly forbidden to step on the lead wire and insulating bracket during the operation and maintenance of the transformer
(3) The transformer should be regularly tested for insulation
4. Avoid excessive temperature of transformer coil, insulation deterioration or burning
(1) The overload operation of the transformer shall be carried out in accordance with GB/T15164-94 "Load Guidelines for Oil-immersed Power Transformers" and DL/T572-95 "Regulations for the Operation of Power Transformers" (2) The hot spot temperature of the transformer in operation shall not exceed the limits and specific limits of GB/T15164-94 "Load Guidelines for Oil-immersed Power Transformers". (3) The air cooler of the transformer is externally washed with compressed air or water every 1-2 years to ensure the cooling effect (4) When the transformer has defects or abnormal insulation, it shall not exceed the specified current operation, and strengthen the operation supervision 5) The fan blades of the cooler should be balanced at regular intervals, and the regular maintenance should ensure normal operation, and the fan motor with large vibration and serious wear should be replaced
5. Avoid overvoltage breakdown
(1) When switching the no-load transformer, it is necessary to reliably ground the neutral point
(2) Two grounding down wires connected to different locations of the main grounding grid should be installed at the transformer neutral point, and each grounding down wire should meet the requirements of thermal stability
6. Avoid breakdown under working voltage
(1) The transformer after overhauling and replacing the insulating parts or part of the coil and being dried should be subjected to a partial discharge test
(2) When the transformer oil chromatography in operation is abnormal, and the equipment is suspected to have discharge faults, a partial discharge test is carried out.
7. Avoid maloperation/refusal of maintenance equipment
(1) The maintenance equipment of the transformer must be perfect and reliable, and it is strictly forbidden for the transformer and the high/medium/low voltage side equipment of the transformer to be put into operation without maintenance.
(2) The gas relay should be adjusted correctly and tested regularly to eliminate the mismovement elements caused by short circuit of the contact, such as installing a rainproof cover to avoid the mismovement of the contact when it is damp.
(3) The action signal of the pressure release valve should be connected to the signal circuit, and the action contact of the winding thermometer and the top oil thermometer should be connected to the signal circuit.
(4) The transformer should be equipped with a faulty recorder, and the backup maintenance on each side of the transformer should be powered by different DC power sources, so as to avoid the loss of DC for some reason, the formation of backup maintenance is all paralyzed, and the result of continuous problems and expansion of the incident is cut for a long time.
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