Self-locking device for off-circuit tap-changer hand operation mechanism

Abstract

The invention discloses a self-locking device for an off-circuit tap-changer hand operation mechanism, which comprises a handle and gear self-locking device and an end-to-end self-locking device. The handle and gear self-locking device is formed in a way that: a self-locking gear and a self-locking wheel are connected to an input shaft; the self-locking gear is meshed with an upper middle gear ona middle shaft; a transition gear on a transition shaft is meshed with a lower middle gear and a bevel gear I on a bevel gear shaft; and a push wheel is in fit with a self-locking pin connected to a switch lock. The end-to-end self-locking device is formed in a way that: a limiting post with a spring is connected to a pedestal, and forms fit with an end-to-end limiting block fixed on a large gearand a limiting wheel on an output shaft. The self-locking device has a simple structure and comprehensive functions, is easy to manufacture and assemble and arranged on the hand operation mechanism for use, completely solves the problem of gear slippery caused by the movement of a handle after a gear is shifted in place, can prevent overrange running caused by improper gear shifting from causing equipment damages by the end-to-end self-locking, and improves the reliability and safety of equipment; and unlocking can be performed only by a key after handle and gear self-locking so as to achievesafety and reliability in use.

Description

technical field [0001] The invention relates to a safety device on an operating mechanism of a tap changer of a transformer, in particular to a self-locking device of a manual operating mechanism of an off-excitation tap changer. Background technique [0002] In the field of power transmission and transformation, off-excitation tap-changers have been widely used as control equipment for power transformers, such as strip tap-changers and cage tap-changers, which control the moving contacts and static contacts through horizontal movement and rotational movement respectively. The contacts are connected in different ways, thereby changing the number of turns of the transformer coil and adjusting the voltage. The above two tap changers adjust the voltage through the rotation of the rotary shaft. [0003] Chinese patent application No. 201010271414.X "Manual operating device for non-excitation tap changer" provides a kind of eye-catching display, intuitive reading, complete funct...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent application No. 201010271414.X "Manual operating device for non-excitation tap changer" provides a kind of eye-catching display, intuitive reading, complete functions and self-locking function, which can realize self-locking of handle, gear position, front and rear gears, It is a manual operating device that can completely eliminate potential safety hazards to equipment and personnel caused by slippage due to improper gear position, but the self-locking mechanism structure on it is still relatively complicated and difficult to assemble

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