Two-core column voltage transformer

Abstract

The invention relates to a two-core column transformer which comprises a metal box body with an inner cavity, a square-shaped two-core column iron core of the voltage transformer, and a square-shaped single-core column iron core of an isolation transformer, wherein a high-voltage sleeve and a grounding sleeve are respectively arranged at the top and the bottom of the metal box body, and the metalbox body is filled with inert gas; the square-shaped two-core column iron core of the voltage transformer is arranged at the upper part of the inner cavity of the metal box body and electrically connected with the metal box body, and comprises an upper core column and a lower core column, an upper balancing winding and a first-section primary winding are wound on the upper core column, and a second-section primary winding and a secondary winding of the voltage transformer are wound on the lower core column; the square-shaped single-core column iron core of the isolation transformer is arranged at the lower part of the inner cavity of the metal box body and electrically connected with the metal box body, a primary winding of the isolation transformer is wound on the single-core column ironcore, an annular shielding cover is arranged around the single-core column iron core, and the secondary winding of the isolation transformer is wound in the annular shielding cover; the upper balancing winding is further used for supplying power to the primary winding of the isolation transformer; and the secondary winding of the isolation transformer and the secondary winding of the voltage transformer are connected in series for being used as the secondary output side.

Description

technical field [0001] The invention relates to a voltage transformer, in particular to a gas-insulated voltage transformer with two core column structures. Background technique [0002] The voltage transformer with two stems is mainly used in 110kV power system. [0003] The structure of this kind of voltage transformer is mainly to install a square-shaped iron core in a porcelain box filled with insulating oil. The iron core has upper and lower stems, and an upper balance winding and a second stem are wound around the upper stem. One section of primary winding, the lower balance winding and the second section of primary winding are wound around the lower core, and a secondary winding is wound outside the second section of primary winding. The structure is characterized by the first section of primary winding and the second section of winding The primary winding has the same number of turns, and the upper balance winding and the lower balance winding also have the same num...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the potential safety hazards caused by the low mechanical strength of the porcelain box and the large oil capacity of the current two-stem structure voltage transformer, as well as the need for a larger size porcelain box when the primary voltage increases, the safety is lower, and the iron The error of the voltage transformer is unstable due to the increase of the core-to-ground capacitance current. The present invention provides a two-core voltage transformer with an improved structure to meet the requirements for use under ultra-high voltage and ultra-high voltage.

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