What are the routine maintenance items of transformers?

(1) transformers in power plants and substations, at least once a day; Conduct night patrol at least once a week;

(2) At least 1 time for unattended substations/transformers above kloc-0/50kva, and at least 1 time per month for transformers below 3 150 kva;

(2,500 kVA and below distribution transformers shall be installed at least once a month indoors and at least once a season outdoors (including suburbs and rural areas).

2. Answer: (1) The new equipment or transformer after overhaul and transformation will be put into operation within 72h;

(2) when there are serious defects;

(3) when the weather changes suddenly (such as strong wind, fog, heavy snow, hail, cold wave, etc.). );

(4) Thunderstorm season, especially after the thunderstorm;

(5) High temperature season and peak load period;

(6) Trial operation of transformer emergency load.

3. Answer: (1) The oil temperature gauge of the transformer should be normal, the oil level of the oil storage tank should correspond to the temperature, and there is no oil leakage or oil leakage in all parts;

(2) The oil level of the casing is normal, and there are no abnormal phenomena such as damaged cracks, serious oil stains and discharge marks outside the casing;

(3) the transformer sound is normal;

(4) The hand feel temperature of each cooler should be similar, the fan, oil pump and water pump are operating normally, and the oil flow electrical appliances are operating normally;

(5) The oil pressure of the water cooler should be greater than the water pressure (unless otherwise specified by the manufacturer);

(6) The moisture absorber is in good condition and the adsorbent is dry;

(7) Wire joints, cables and buses shall have no signs of heating;

(8) Pressure releaser or safety airway and explosion-proof membrane shall be intact;

(9) The tap position and power indication of the on-load tap changer should be normal;

(10) There should be no gas in the gas relay;

(1 1) Each control box and secondary terminal box shall be tightly closed without moisture;

(12) The outer surface of dry-type transformer shall be free of dirt;

(13) The doors, windows and lighting of the distribution room are in good condition, the house is watertight and the temperature is normal;

(14) Other items that need to be checked according to the structural characteristics of the transformer in the field regulations.

4. Answer: (1) There should be no abnormal heating on the shell and box edge;

(2) The grounding of each part should be good; When necessary, measure the grounding current of iron core and clamp;

(3) The transformer with strong oil circulation cooling should be tested for automatic switching of cooling device;

(4) After the cock is emptied, the water cooler should be free of oil pollution;

(5) The action of the on-load voltage regulating device should be normal;

(6) All signs shall be complete and obvious;

(7) All kinds of protection devices should be complete and in good condition;

(8) All kinds of thermometers shall have correct and reliable overtemperature signals within the verification period;

(9) Fire control facilities shall be complete and in good condition;

(10) room (hole) transformer ventilation equipment should be in good condition;

(1 1) Oil storage tanks and oil discharge facilities shall be kept intact;

5. Answer: (1) Adjust the voltage step by step, and monitor the tap position and the changes of voltage and current at the same time;

(2) The on-load tap-changer installed in single-phase transformer group and three-phase transformer in phases shall be operated by three-phase synchronous motor;

(3) When the on-load voltage regulating transformers run in parallel, their voltage regulating operations should be carried out step by step or synchronously;

(4) When the on-load voltage regulating transformer and the excitation voltage regulating transformer run in parallel, the tap voltages of the two transformers should be as close as possible;

(5) Check the difference between the system voltage and the rated tap voltage to make it conform to the provisions of this regulation 1. 1.