Method and device for live oil replenishment of transformer bushing

Abstract

The invention relates to the field of oil supplement of high-voltage sleeve pipes, in particular to a method and device for supplementing oil to an electrified transformer sleeve pipe. Electrified oil supplement is carried out on the top of a primary sleeve pipe and a secondary sleeve pipe of a transformer with the voltage level higher than 66kV by adopting an equipotential operation method. The method comprises the following specific operating steps that (1) the phase position of the sleeve pipe must be checked before the oil supplement to confirm the consistence with the emergency repair instructions send out by production scheduling, and the facts that the quality of oil in an oil supplementing barrel is qualified and the type of the oil in the oil supplementing barrel is identical with that of the oil inside the sleeve pipe are confirmed; (2) an insulation herringbone ladder is assembled on the ground; (3) after a potential electrician climbs to an operation site at the upper end of the sleeve pipe of the transformer along the herringbone ladder, a safety belt and a shielding potential equalizing wire are hung, sealing screws of the sleeve pipe are unfastened, and an oil filling pipe of the oil supplementing device is inserted into a sealing hole of the sleeve pipe. Compared with the prior art, the method and device for supplementing the oil to the electrified transformer sleeve pipe have the advantages that an equipotential mode of electrified operation is adopted, the blank in the technical aspect of the electrified oil supplement of the transformer sleeve pipes is filled, and good economic benefit and wide application prospects are achieved.

Description

technical field [0001] The invention relates to the field of oil replenishment for high-voltage bushings in power plants and substations in power systems, in particular to a live oil replenishment method and device for transformer bushings. Background technique [0002] Power transformers are the main operating equipment in power plants and substations. The primary and secondary bushings of the transformer are one of the important current-carrying components of the transformer, and are also the main insulation device outside the transformer box. The lead-out wires of the transformer winding must pass through the insulating sleeve to insulate between the lead-out wires and between the lead-out wires and the transformer shell, and at the same time play the role of fixing the lead-out wires. According to the equipment condition maintenance test regulations and the electrical equipment preventive test regulations, the bushing needs to undergo periodic oil gas chromatographic an...

AI Technical Summary

Problems solved by technology

[0003] The traditional transformer bushing must be powered off when oil is replenished. After the power failure, the oil replenishing personnel climb to the upper end of the bushing, carry the oil pot in hand, and rely on the gravity of the oil to replenish oil. This method has cumbersome switching operations and high-altitude operations are more dangerous. , the lack of low work efficiency

[0004] In addition, the ticking oil spots on the bushing during oil replenishment, although wiped in time, still have residual insulating oil covering the porcelain edge of the bushing. In light rain and heavy fog, the oily part of the bushing will generate serious discharge

If the discharge phenomenon occurs frequently and the operation lasts for a long time, the outer insulation strength of this part of the bushing will be reduced, and even a flashover will occur, causing a safety accident

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