Installation essentials of oil-immersed transformer
Release time：2021-03-27 09:38:00 Popularity： Source：未知
The distribution transformer is the main component of the substation. The oil-immersed transformer is usually installed in a separate transformer room. Relying on oil as cooling medium, such as oil-immersed self-cooling, oil-immersed Air Cooling, oil-immersed water cooling and forced oil circulation. In general, the main transformer of step-up substation is oil-immersed, and its ratio is 20KV/500KV, or 20KV/220KV. Usually, the auxiliary transformer used by power plant for driving belt's own load (such as coal mill, induced draft fan, forced draft fan, circulating water pump, etc.) is also oil-immersed, its ratio is 20KV/6KV. Oil-immersed transformer adopts full oil-filled sealing type. The corrugated oil tank shell is a permanently sealed oil tank because of its elasticity to adapt to the expansion of oil. The oil-immersed transformer has been widely used in various distribution equipment. Pre-preparation 1, man-hour quota: (according to the national quota norms) the body of the device required induction work days for 21 days. The work includes: Open box inspection, body inspection, casing, oil pillow and radiator cleaning, oil column test, accessories, Shim and wheel stop manufacturing device, filling column and post-installation all sealing test, grounding, repainting and so on. Transformer in the process of the need is dry, check and judge, demand is dry, dry with iron loss method after the need for 20 days, oil filter need for 3.38 days/ton. The days needed for commissioning shall be accounted for separately. 2, installation site placement: Power Transformer Overhaul and assembly operations should be carried out in the maintenance room. No maintenance room, the need to select temporary devices, it is best to select the transformer in the vicinity of the base platform, so that the transformer in place, can also be installed on the base platform, outdoor site should have the account. It is necessary to transport the temporary installation of convenient, smooth road, meet the width, the ground should be solid, flat and dry, away from smoke windows and water towers, with the adjacent building spacing to meet fire requirements. 3, the designated safety measures: 1 to avoid personal electric shock and fall, and other incidents. 2. Avoid overheating insulation. 3. Avoid fires. Prevent sth from falling into the gas tank. 5. Avoid attachment damage. 6 avoid inverting transformers. 4, the development of technical measures: 1 to avoid the transformer core should not be damp. 2. How To make sure the joints touch well. All parts should be well sealed and oil free. How to ensure transformer insulation and oil insulation. 5, the basic procedure of Installation Operation: 1 preparation operation (things, materials, equipment, drawings)2 insulation inspection and judgment (mainly coil and iron core)3 attachment inspection (should be complete, no missing)4 hanging core inspection (to avoid moisture absorption and things, parts and so on fall into the oil tank)5 attachment device (appearance inspection, insulation measurement and close experiment)6 end Operation 7 explain Experiment 8 Trial Operation 6, Division of Operation Personnel Organization: 1 Device Commander and technical person in charge 2 safety personnel 3 oil filter group 4 lifting and transporting personnel 5 experimental personnel 6 device personnel. 7, the request to the transformer room: 1 first-class Fireproof 2 ventilation outstanding 3 safety interval should meet 4 bottom platform should be firmly 5 lifting equipment should be without defect. Sentence is too long, please supply a shorter sentence. Request 1, the transformer through the long interval transportation, will suffer the bigger sensation, the demand carries on the machine body to look. Transformer body inspection is divided into hanging core and hanging cover. Regardless of the suspension core or suspension cover, the content of the view is common. Core inspection should be completed within one working day, to speed up the process of inspection. 2, to hanging core view for example: 1) transformer hanging core should be carried out in indoor, if there should be outdoor tents, to avoid rain, snow, fog, sand and other adverse weather to prevent hanging core. In winter, the temperature of the suspension core shall not be lower than zero, otherwise the temperature of the core of the transformer will be raised to 10 °c higher than the surrounding temperature. The shorter the time the core is exposed to the air, the better, and the relative humidity of 65% should not exceed 16 hours, the relative humidity of 25% can not exceed 12 hours, accounting time from the beginning of oil discharge to oil injection stop. When the relative humidity of the climate exceeds 75% , it is not allowed to be checked by the suspension core. In the process of core inspection, special care should be taken to avoid parts and things falling into the tank. Core lifting step 1) select the core lifting position, oil discharge (place the market below)2) remove the explosion-proof cylinder, oil pillow, see: 1 Wire Core Insulation 2 iron core Insulation 3 through-core Bolt Insulation 4 connecting switch insulation 5 high and low voltage leads 6 fuel tank Sundries 7 radiator whether there is blockage 8 telemetry insulation resistance 9 measurement DC resistance 6) after all items see no problem should be reinstalled in a timely manner, install the iron core back into the oil tank 7. Reinforce the large cover bolt 8.) Remove the attachment 9. Write the qualified oil 10.) Stop for 6-10 hours and do a full set of pressure test 11, oil Pillow side should be 1-1.5% gradient. 2. Transformers should be reinforced. 3. The primary and secondary leads of the transformer should not force the bushing. The transformer Shell is connected with the neutral point and the grounding device to form a trinity. 800KVA (installation gas relay).
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