Hot oil spray and drying device and method for converter transformer

Abstract

The invention discloses a hot oil spray and drying device for a converter transformer. The hot oil spray and drying device for the converter transformer comprises an oil supply device, a spray pipe, a vacuum unit, a drying air generator and a converter transformer body, wherein a sealing chamber is arranged on the periphery of the converter transformer body, the sealing chamber comprises an upper cover installed on the upper side, a spray pipeline is installed on the upper cover and is respectively communicated with the oil supply device and the sealing chamber, the vacuum unit and the drying air generator are respectively communicated with the sealing chamber, three insulating pieces which are used for inspecting the drying effect of the sealing chamber are installed in the sealing chamber, the insulating pieces are respectively installed at the bottom of a tap switch of the converter transformer, the bottom of windings and the top of the windings, and a heating plate is installed on the lower side of the sealing chamber. The invention further discloses a hot oil spray and drying method of the converter transformer, which comprises the steps of insulating oil filling, normal-pressure hot oil spray, vacuum pumping and vacuum release. The hot oil spray and drying device and method for the converter transformer have the advantages of quick spray speed, thorough drying, high reliability and practicability and easiness in field operation.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a hot oil spray drying device and method for a converter transformer. Background technique [0002] The converter transformer (referred to as the converter transformer) is the main equipment of the DC transmission system, and its main parameters are determined according to the special requirements of the DC system. The function of the converter transformer is to supply AC power to the converter or receive AC power from the converter, and convert the grid-side AC voltage into the voltage required by the valve side. As the connection between the AC network and the high-voltage DC network, compared with ordinary transformers, it not only needs to provide 12-pulse AC voltage with a phase difference of 30° for the valve hall equipment, but also has a larger impedance to limit the impact of the AC system on the mainstream system. Intrusion, which determines that the structure of ...

AI Technical Summary

Problems solved by technology

However, the converter transformer may bring moisture in the air during bushing installation, and there is no reliable drying measure to drain the moisture in the transformer oil and insulating components after oil filling

Moreover, important large-scale transformers will only carry out thermal oil circulation process measures for a certain period of time after installation, and the transformer will be put into operation without drying measures after the oil test passes the test. Internal discharge or even insulation breakdown during commissioning or operation

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