Transformer on-load tap changer

Abstract

The invention discloses a transformer on-load tap changer. Each phase of the transformer on-load tap changer comprises a rated branch, a boosting branch, a step-down branch and a transition branch, wherein the rated branch, the boosting branch, the step-down branch and the transition branch are respectively provided with a vacuum arc-extinguishing chamber; the transition branch is connected with the rated branch in parallel; and the transition branch comprises a transition vacuum arc-extinguishing chamber which is connected with a resistor in series, a boosting permanent magnet mechanism which is used for driving the vacuum arc-extinguishing chamber in the three-phase boosting branch to open or close, a step-down permanent magnet mechanism which is used for driving the vacuum arc-extinguishing chamber in the three-phase step-down branch to open or close, and a rated permanent magnet mechanism which is used for driving the vacuum arc-extinguishing chambers in the three-phase rated branch and the transition branch to open or close.

Description

technical field [0001] The invention belongs to the technical field of transformer equipment in the electric power industry, and in particular relates to an on-load tap changer used on a transformer. Background technique [0002] In the "Action Plan for Construction and Transformation of Distribution Networks (2015~2020)" issued by the National Energy Administration, the energy saving and consumption reduction, power supply quality, intelligence, and reliability of distribution stations are all required to be greatly improved. It is also increasingly urgent that the transformer has an on-load voltage regulation function. [0003] At present, the existing distribution transformers generally use compound on-load tap changers, which have the following disadvantages: During the process of switching taps, the contacts are prone to arcing, which leads to damage to the contacts and makes the The oil quality is easily deteriorated, and regular power cuts and oil changes are require...

AI Technical Summary

Problems solved by technology

[0003] At present, the existing distribution transformers generally use compound on-load tap changers, which have the following disadvantages: During the process of switching taps, the contacts are prone to arcing, which leads to damage to the contacts and makes the The oil quality is easily deteriorated, and regular power cuts and oil changes are required for maintenance. Continuous gear adjustments will cause the oil temperature to rise, and frequent pressure adjustments are not suitable; moreover, it uses the electric motor to rotate to store energy for the spring energy storage mechanism, and then releases it suddenly after passing the dead point. mode to drive tap contacts to switch voltage gears

This kind of driving mechanism has complex structure, many parts, high failure rate, low reliability, slow action speed of tap changer and long response time

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