A closed underwater transformer

Abstract

The invention relates to an enclosed underwater transformer. The enclosed underwater transformer comprises a shell, a transformer winding, a base, an enclosed corrugated pipe compensator and a monitoring cabin, wherein a bottom plate is arranged at the bottom of the shell, a top cover is arranged at the top of the shell, the shell is welded with the bottom plate, the bottom plate is fixed on the base by a bolt, the transformer winding is horizontally hung at the bottom of the shell, an annular groove is formed in a circumferential edge of the top cover of the shell, the enclosed corrugated pipe compensator is arranged in the annular groove, the monitoring cabin is arranged on the top cover of the shell and at a middle position of the annular groove, the remaining part of the shell is of afull-welding or full-casting structure except the transformer winding and a shell top assembly comprising the top cover, the monitoring cabin and the enclosed corrugated pipe compensator, and the shell top assembly is integrally welded onto the shell to form a fully-enclosed structure after the installation of the shell top assembly is completed. By the enclosed underwater transformer, the internal pressure of the transformer can be maintained consistent with external seawater pressure, and the enclosed underwater transformer is applicable to an underwater oil-gas production system.

Description

technical field [0001] The invention relates to the field of underwater electrical equipment, in particular to a closed underwater transformer that adopts an annular bellows for pressure compensation. Background technique [0002] The basic structure of the underwater transformer is to install the transformer in a sealed casing, and the space between the transformer and the casing is filled with insulating oil. Underwater transformers need to withstand seawater pressure and heat simultaneously during deep sea operation. The underwater transformer works on the deep seabed and bears the pressure of seawater. Transformer losses are dissipated outward in the form of heat, so underwater transformers are also subjected to thermal effects. While the transformer is going through different working states, the insulating oil will also expand and contract with temperature. If seawater infiltrates the insulating oil in the underwater transformer shell, the transformer will fail. The...

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Problems solved by technology

When the volume of the transformer is large, the amount of compensation required will increase accordingly, so the number of pressure compensators required will also increase accordingly, which will result in a series of problems such as complex structure of the transformer as a whole, difficult maintenance, and high manufacturing cost. question

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