CN-121075787-B - Transformer leakage oil on-line treatment method and plugging fastening structure

CN121075787BCN 121075787 BCN121075787 BCN 121075787BCN-121075787-B

Abstract

The application provides an online treatment method and a plugging fastening structure for leakage oil of a transformer, which belong to the technical field of online maintenance of the transformer and comprise the steps of adding a rubber ring on a fixing bolt of a flange cover plate under the condition of not stopping, disassembling, assembling and replacing an original O-shaped sealing ring, plugging the outside of the flange cover plate to further avoid leakage of insulating oil at the fixing bolt, carrying out online maintenance on the transformer without stopping on the basis of not disassembling the fixing bolt, reducing load and stopping a generator set, avoiding sudden rise of an electrical load during stopping recovery, reducing the maximum required value, ensuring the continuity and the stability of the electrical level of equipment, avoiding new load peaks, avoiding production interruption loss caused by stopping maintenance, increasing economic benefit, and simultaneously, when the leakage oil of the transformer is treated online, the normal operation of the generator set can consume continuous power generation of coal gas, avoid gas diffusion generated by power failure maintenance of the transformer, and reduce resource waste and environmental pollution.

Inventors

TAO RUIJI
ZHAO XIAOPING
Qu Sijun
LIAO JUN
XIE ZHONGZHONG
WANG PENG
SUN JIAN
WANG BITAO
XIAO KAI
WEI HONGKUN

Assignees

广东中南钢铁股份有限公司

Dates

Publication Date: 20260505
Application Date: 20250716

Claims (8)

1. The online treatment method for the transformer leakage oil is characterized by comprising the following steps of: injecting oil into the oil conservator until the oil level in the oil conservator is not lower than a first oil level; Deflating the gas relay until the gas relay is free of bubbles after oil flowing; sequentially installing rubber rings on the outer sides of fixing bolts of a flange surface cover plate of a secondary outgoing line of the high-voltage side A-phase current transformer of the transformer so as to plug the outer sides of the flange surface cover plate; the utility model provides a secondary lead-out wire flange face apron of transformer high pressure side A phase current transformer's fixing bolt outside install the rubber ring additional in proper order, in order the shutoff is carried out in the outside of flange face apron, include the step: removing nuts, spring pieces and steel gaskets on the fixing bolts; Sleeving a rubber ring on the fixing bolt; the nut is arranged back to the fixing bolt, and the rubber ring is compressed by the nut and the flange face cover plate, so that the rubber ring is deformed; Repeating the steps until rubber rings are added on all the fixing bolts; The oil is filled into the oil conservator until the oil level in the oil conservator is not lower than a first oil level, and the method comprises the following steps: Removing the screw in the air vent of the conservator, and loosening the main body oil tank respirator; Checking the oil filter, and installing an oil filling pipe on the oil conservator; Opening a valve of the oil filling pipe, and filling oil into the oil conservator from the lower part of the oil conservator through the oil filling pipe; During oiling, the exhaust condition of the air vent is concerned; stopping oiling when the oil level gauge displays the first oil level; Closing the valve of the oil filling pipe and removing the oil filling pipe from the oil conservator; and (5) returning the screw of the air vent to fasten the main body oil tank respirator.
2. The on-line treatment method for transformer leakage oil according to claim 1, wherein, And the first oil level is a seventh grid of the oil level gauge.
3. The on-line treatment method for transformer leakage oil according to claim 1, wherein, The rubber ring is a flat-surface butadiene rubber ring; The inner diameter of the rubber ring is equal to the diameter of the fixing bolt, the outer diameter of the rubber ring is 1.5-2 times of the diameter of the fixing bolt, and the thickness of the rubber ring is 0.15-0.25 time of the diameter of the fixing bolt.
4. The on-line treatment method for transformer leakage oil according to claim 1, wherein, The oil leakage treatment operation is carried out on a temporary maintenance platform, the temporary maintenance platform is erected at a position close to the conservator, the temporary maintenance platform takes the edge of the conservator as a limit, and in the operation process, both operators and operation tools cannot exceed the limit.
5. The on-line treatment method for transformer leakage oil according to claim 4, wherein, And injecting oil into the oil conservator until the oil level in the oil conservator is not lower than the first oil level, and the method further comprises the following steps: Handling a second work bill, a high-place work bill and a safe receipt; Jointly confirming that the heavy gas protection combined jump board is withdrawn by an equipment room, an operation party, a point inspection party and a maintenance party; and carrying out safety inspection on the temporary overhaul platform to confirm that the temporary overhaul platform meets the operation requirement.
6. The on-line treatment method for transformer leakage oil according to claim 5, wherein, After oiling the oil conservator, the transformer is enabled to run for a first time, inspection is enhanced during the first time, the running condition of the transformer is inspected according to the inspection requirement for the inspection for every second time, whether a light gas alarm message appears in an electric monitoring background during duty is concerned, and when an abnormal condition appears, technicians are timely reported and notified to arrive at the site for judgment.
7. The on-line treatment method for transformer leakage oil according to claim 6, wherein, And after the equipment room, the operation, the point inspection and the maintenance party jointly confirm that the gas relay has no bubbles in oil flowing and the heavy gas protection combined jump pressing plate has no action, and then an operator applies to recover the heavy gas protection combined jump pressing plate to put into operation.
8. The plugging fastening structure for oil leakage of a transformer is characterized in that the plugging fastening structure is applied to the online treatment method for oil leakage of a transformer according to any one of claims 1-7, and comprises: The fixing bolts sequentially penetrate through the flange and the flange face cover plate; the rubber ring is sleeved on the outer side of the fixing bolt, and the rubber ring is attached to the side surface, deviating from the flange, of the flange face cover plate; the nut is sleeved on the fixing bolt, the nut is in threaded connection with the fixing bolt, and the nut is used for compressing and fixing the rubber ring on the side surface, deviating from the flange, of the flange surface cover plate.

Description

Transformer leakage oil on-line treatment method and plugging fastening structure Technical Field The application belongs to the technical field of online overhaul of transformers, and particularly relates to an online treatment method for leakage oil of a transformer and a plugging fastening structure. Background The transformer for the high-voltage plant can generate a plurality of oil leakage points after long-term operation, needs to be maintained regularly, is put into operation for a period of time after maintenance, and still cannot avoid the problem that the flange surface of the secondary wire outlet of the A-phase current transformer on the high-voltage side of the transformer continuously and slightly oil leakage. If the oil level of the body of the transformer for the high-voltage plant is lower and lower in time, short-circuit accidents can occur when the oil level is lower than the oil level of the sintered set of the transformer, and serious economic loss is caused. At present, for the problem of oil leakage of the secondary line leading-out flange surface of the A-phase current transformer at the high voltage side of the transformer, two solutions are provided, one is to ensure the normal operation of the transformer, the oil leakage point is sealed by adopting a method of coating sealing glue or glass cement at the oil leakage position, however, after three months of operation, the oil level of a conservator is still obviously reduced, the problem of oil leakage cannot be fundamentally solved, the other is to stop a machine set, change an O-shaped sealing ring at the flange surface, further detect the oil level after the sealing ring is changed, keep the transformer stand for 24 hours after confirming that the oil leakage is no longer, take an oil sample for an oil withstand voltage test, recover power transmission after being qualified, and the whole process transformer has at least 30 hours of power failure, and the power generation set cannot be started to operate for power generation during the period, so that the economic loss is large. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art or related art. To this end, a first aspect of the invention provides an online treatment method for transformer leakage oil. The second aspect of the invention provides a plugging fastening structure for oil leakage of a transformer. In view of this, according to a first aspect of an embodiment of the present application, there is provided an online treatment method for leakage oil of a transformer, including: injecting oil into the oil conservator until the oil level in the oil conservator is not lower than the first oil level; Deflating the gas relay until the gas relay is free of bubbles after oil flowing; And sequentially installing rubber rings on the outer sides of fixing bolts of flange face cover plates of secondary outgoing lines of the high-voltage side A-phase current transformer of the transformer so as to seal the outer sides of the flange face cover plates. In one possible embodiment, the oil is filled into the oil conservator until the oil level in the oil conservator is not lower than the first oil level, comprising the steps of: Removing the screw in the air vent of the conservator, and loosening the main body oil tank respirator; checking the oil filter, and installing an oil filling pipe on the oil conservator; the valve of the oil filling pipe is opened, from under the conservator through the oil filling pipe oiling in the direction oil conservator; during oiling, the exhaust condition of the air vent is concerned; stopping oiling when the oil level gauge displays the first oil level; Closing a valve of the oil filling pipe, and removing the oil filling pipe from the conservator; And (5) returning screws for discharging the air holes to fasten the main body oil tank respirator. In one possible embodiment, the first oil level is the seventh compartment of the oil level gauge. In a possible implementation mode, a rubber ring is added on the outer side of a fixing bolt of a flange surface cover plate of a secondary outgoing line of a high-voltage side A-phase current transformer of a transformer in sequence so as to plug on the outer side of the flange surface cover plate, and the method comprises the following steps: Removing nuts, spring pieces and steel gaskets on the fixing bolts; sleeving a rubber ring on the fixing bolt; The nut is arranged back to the fixing bolt, and the nut and the flange cover plate are used for compressing the rubber ring, so that the rubber ring is deformed; Repeating the steps until the rubber rings are additionally arranged on all the fixing bolts. In one possible embodiment, the rubber ring is a flat-faced butadiene rubber ring; The inner diameter of the rubber ring is equal to the diameter of the fixing bolt, the outer diameter of the rubber ring is 1.5-2 times of the diameter of