An on-load tap changer

Abstract

The invention provides an on-load tap-changer which comprises an oil chamber with an upper cavity and a lower cavity, a changeover switch is arranged on the upper cavity of the oil chamber, a tap selector switch is arranged on the lower cavity, the changeover switch and the tap selector switch are respectively connected with a first driving shaft and a second driving shaft mechanically, the first driving shaft is arranged at the axis of the upper cavity of the oil chamber, the second driving shaft is arranged at the axis of the lower cavity of the oil chamber, a first speed changer is arranged at the bottom end of the first driving shaft, a second speed changer having reverse variable ratio is arranged at the top of the second driving shaft, a fine driving shaft is arranged between the upper cavity and the lower cavity of the oil chamber, and the first speed changer and the second speed changer are mechanically connected through the fine driving shaft. The on-load tap-changer effectively improves the sealing property of oil seal of the driving shafts, and prevents oil in the oil chamber with the changeover switch from entering the oil chamber with the changeover switch.

Description

technical field [0001] The invention relates to the field of transformer equipment, in particular, it is an on-load tap changer. Background technique [0002] The grid voltage changes with the operation mode and load size, in order to improve the voltage quality. The transformer can have a rated output voltage, usually by changing the position of a winding tap tap to achieve voltage regulation, the device that connects and switches the tap position is called a tap changer, which is adjusted by changing the number of turns of the transformer winding Change, change the voltage by adjusting the transformation ratio, and adjust the voltage. On-load voltage regulation means not disconnecting the power supply, so that the transformer can adjust the tap changer with load under normal working conditions. Its principle is that when the moving contact of the switch has not completely left from the first gear, the transition circuit is connected (the current between the two gears is ...

AI Technical Summary

Problems solved by technology

During operation, the oil in the oil chamber of the diverter switch is absolutely not allowed to enter the oil chamber of the tap selector switch. This is because a certain arc is generated during the operation of the diverter switch, which causes the quality of the oil in the oil chamber to deteriorate. It is used in the diverter switch oil compartment and cannot enter the transformer body

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