A manual drive mechanism of off-excitation tap changer

Abstract

The invention discloses a manual driving mechanism of an off-circuit tap-changer. An input terminal of a two-stage sheave deceleration transmission mechanism of an internal transmission mechanism possesses a hand crank rotation shaft. A hand position indicator dial is fixed on a first stage output shaft of the two-stage sheave deceleration transmission mechanism and rotates with the first stage output shaft synchronously. A gear indicator dial is fixed on a second stage output shaft of the two-stage sheave deceleration transmission mechanism and rotates with the second stage output shaft synchronously. A main transmission output shaft is shaftingly arranged in a box. An output terminal of the main transmission output shaft extends out of the box, and the input terminal and the hand crank rotation shaft form power connection through a bevel gear pair. By using the mechanism of the invention, shift operation of a transformer tap-changer is convenient. The tap-changer can change 1shift only through rotating of 10 laps. Hand-operated force and a number of laps are moderate. The mechanism of the invention is fully functional and possesses functions of cutting off electricity through inserting the hand crank, observing an operation signal, detecting an in-gear signal, recording shifting counting and the like.

Description

Technical field: [0001] The invention relates to the technical field of a transformer tap changer, in particular to a manual drive mechanism for an off-excitation tap changer. Background technique: [0002] For many years, the transformer cage off-excitation tap-changer has used a manual mechanism that requires 33 turns of the tap-changer to change one gear. The number of turns of the tap-changer to change one gear is too many. On the other hand, the gear position indicator plate of the original manual mechanism is rotated by the hand-operated input shaft through the multi-stage deceleration of the cylindrical gear, and the gear position of the indicator plate is generally made into 12 equal divisions. The speed ratio from the input shaft to the gear indicator disc shaft is (33×12)396:1, which requires multi-stage deceleration, and the mechanism is complicated; the gear modulus is very small, only M1, and the mechanism also requires that after reaching the limit gear. To li...

AI Technical Summary

Problems solved by technology

[0002] For many years, the transformer cage off-excitation tap-changer has used a manual mechanism that requires 33 turns of the tap-changer to change one gear. The number of turns of the tap-changer to change one gear is too many. On the other hand, the gear position indicator plate of the original manual mechanism is rotated by the hand-operated input shaft through the multi-stage deceleration of the cylindrical gear, and the gear position of the indicator plate is generally made into 12 equal divisions. The speed ratio from the input shaft to the gear indicator disc shaft is (33×12)396:1, which requires multi-stage deceleration, and the mechanism is complicated; the gear modulus is very small, only M1, and the mechanism also requires that after reaching the limit gear. limit function

In this way, the shifting operator may shake the last gear without obvious feeling. Practice has also proved that such accidents often occur.

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