500kV wire outlet device for extra-high voltage transformer

Abstract

The invention relates to a 500kV wire outlet device for an extra-high voltage transformer, which solves the problem of electric field concentration caused by a 500kV lead, improves the electric fielddistribution of the lead, and ensures the insulation reliability of the lead and a 1000kV coil, an oil tank, an iron core and the like. The outgoing line device is simple in structure, does not need to be shielded and bound manually, does not have a complex insulating cylinder matching problem, and has low skill requirements for installation personnel. The wire outlet device can be adjusted, the position of a voltage-sharing ball can be adjusted in a rotating mode with the third shielding cylinder as the axis after the connecting device is loosened, meanwhile, the long circular installation hole in the voltage-sharing ball can be used for adjustment, it is guaranteed that the installed sleeve and the voltage-sharing ball are concentric, electric field distribution is more regular, and insulation reliability is higher.

Description

technical field [0001] The invention relates to a power transformer, in particular to a 500kV outlet device for an extra-high voltage transformer. Background technique [0002] The high-voltage A of the UHV autotransformer has an insulation level of 1000kV, and the medium-voltage Am has an insulation level of 500kV. The medium-voltage lead wires need to be connected in parallel at the end of the high-voltage winding Ak and Ak, and then connected with the first end of the medium-voltage winding Am1. Due to the influence of factors such as the insulation strength of the lead wire and the voltage level of the lead wire, the shape of the lead wire electrode, the insulation structure of the lead wire, and the insulation distance of the lead wire, UHV transformers are limited by transportation conditions, and the outer limit size of the fuel tank and the transportation weight of the product must be strictly controlled. The 500kV outgoing line in the transformer adopts the structur...

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Problems solved by technology

Due to the influence of factors such as the insulation strength of the lead wire and the voltage level of the lead wire, the shape of the lead wire electrode, the insulation structure of the lead wire, and the insulation distance of the lead wire, UHV transformers are limited by transportation conditions, and the outer limit size of the fuel tank and the transportation weight of the product must be strictly controlled. The 500kV outgoing line in the transformer adopts the structure of copper pipes, copper rods with outer insulation and multi-layer insulation tubes, or the structure of shielding tubes wrapped with insulating pulp and then adding multi-layer insulation tubes. The structure is complex and requires high skill levels of operators. The bushing is difficult to fit and the cost is high. Therefore, it is particularly important to design a 500kV outlet structure with high insulation reliability, simple structure, and easy installation and operation in a limited space.

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