Transformer on-load capacity regulation tap-changer

Abstract

The invention provides a transformer on-load capacity-regulating voltage-regulating tap changer comprising a T-shaped support. The T-shaped support is composed of a horizontal part and a vertical part. An on-load regulation mechanism and an on-load voltage-regulating spindle barrel are disposed on two sides of a support plate of the horizontal part respectively. Two motors are disposed on the on-load regulation mechanism side of the support plate. An on-load capacity-regulating contact system of the tap changer comprises a capacity-regulating fixed contact, a capacity-regulating transition resistor and a capacity-regulating moving contact. An on-load voltage-regulating contact system of the tap changer comprises a voltage-regulating fixed contact, a voltage-regulating transition resistor and a voltage-regulating moving contact. Compared with the prior art, the transformer on-load capacity-regulating voltage-regulating tap changer is small in size and meets the requirement for large-range voltage regulation for 3-9 tap positions.

Description

technical field [0001] The invention relates to a transformer on-load tap-changer, in particular to a transformer on-load capacity-adjusting and voltage-regulating tap-changer. Background technique [0002] The on-load tap-changer is a switching device that provides a constant voltage for the transformer when the load changes. The basic principle is to switch between taps in the transformer winding without interrupting the load current, thereby changing the number of turns of the winding to realize transformer voltage regulation. In the power transmission and transformation industry, in order to ensure the voltage quality of the system and users and improve the voltage qualification rate of the power supply system, large transformers are widely installed with on-load tap changers. [0003] ZL201220435156.9 discloses the transformer on-load capacity and voltage regulation tap-changer, but the following defects still exist: [0004] ①: The on-load capacity regulating switch ...

AI Technical Summary

Problems solved by technology

[0004] ①: The on-load capacity regulating switch and the on-load voltage regulating switch are integrated in an insulating cylinder, and the two switches have their own independent driving mechanism, fast mechanism, rotating shaft and contact system; but the tap changer only The on-load tap changer and the on-load tap changer are simply electrically connected, which leads to the increase in the volume of the tap changer, which increases the difficulty of installation of the tap changer, and is difficult to meet the requirements of the power system or user installation environment. requirements;

[0005] ②: The on-load capacity-regulating contact system and the on-load voltage-regulating contact system in the on-load capacity-regulating tap-changer are integrated in one insulating cylinder. The capacity-regulating main contact composed of a number of moving and static contacts and the capacity-regulating transition contact composed of a number of moving and static contacts and transition resistances that can form multiple fractures in series; the on-load capacity-adjusting contact system is set too much The dynamic and static contacts of the tap changer will inevitably reduce the voltage regulation range of the OLTC contact system, resulting in insufficient voltage regulation capability of the tap changer, which cannot meet the voltage regulation needs of the power system or users

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