Full-sealing oil sampling device and method for transformer bushing

Abstract

The invention provides a full-sealing oil sampling device and method for a transformer bushing. The full-sealing oil sampling device for the transformer bushing comprises a device body and a cone; a first oil port, a second oil port, a first gas port, a second gas port and a third gas port are formed in the device body; the first oil port extends into the transformer bushing, and the second oil port is connected with a sampling device; the first gas port leads to the inside of the transformer bushing, and the second gas port and the third gas port are connected with a vacuum pump and a nitrogen bottle respectively. In the oil sampling process, nitrogen is introduced into the transformer bushing, a certain positive pressure is formed in the bushing, and under the action of the positive pressure, an oil sample automatically flows into the sampling device; in the oil replenishing process, the transformer bushing is vacuumized, a certain negative pressure is formed in the bushing, and under the action of the negative pressure, oil automatically flows into the transformer bushing. Thus, the device ensures the sealing of the whole sampling process and realizes full-sealing sampling.

Description

technical field [0001] The present application relates to the technical field of oil extraction for electrical equipment, in particular to a fully sealed oil extraction device and method for transformer bushings. Background technique [0002] The transformer is one of the important equipment in the power system. The transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. The main components include iron cores, windings, bushings, etc. [0003] As one of the transformer accessories, the bushing plays an important role. The wires and cables in the bushing are protected by transformer oil soaking. If there is a problem with the bushing, it will directly affect the stable operation of the transformer. In severe cases, it may cause a catastrophic accident of the transformer. In order to ensure the safe operation of the transformer, It is necessary to take samples of the transformer oil in the bushing, and judge the operation status o...

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Problems solved by technology

[0004] However, when a part of the oil sample is taken from the oil sampling valve or the oil supply port, a negative pressure is formed in the casing due to the drop of the oil level. Under negative pressure, the transformer oil cannot flow out naturally from the sampling valve or the oil supply port, and the casing needs to be destroyed artificially. In order to complete the follow-up oil sampling process, the oxygen and water in the air enter the bushing, and the transformer oil undergoes chemical reactions such as oxidation and cracking under the action of oxygen and water. In this way, the initial crude oil in the bushing The properties are destroyed, and the reliability of the operation in the bushing cannot be guaranteed; and the collected oil samples are deteriorated and distorted due to the action of oxygen and water, which cannot represent the real state in the bushing, thus affecting the normal operation of the transformer bushing. judge

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