Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd

Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd

Vacuum on-Load Tap Changers for Oil Immersed Transformers Switch

Basic Info

  • Model NO.: OLTC

  • Connection Method: Y,D

  • Trademark: Jilni

  • Specification: IEC CE, ISO

  • HS Code: 8535900090

  • Max Rated Current: 600A 1500A

  • Rated Voltage: 3.3kv

  • Transport Package: Wooden Cases

  • Origin: Liaoning

Product Description

Vacuum On-Load Tap Changers For Oil Immersed Transformers switch 


on load tap changer (Hereafter, referred to as OLTC) applies to power and rectification transformers to change the taps under load for the purpose of voltage regulation. Three phase OLTCs are used at the neutral point of Y connection, and single phase OLTC can be used for any connections. 

OLTC is a typical OLTC of combined structure, consisting of diverter switch and tap selector.

on load tap changer is to be mounted to the transformer tank cover by its tap changer head which serves also for connecting to the motor driver via the worm gear box and bevel gear box to drive tap change operation.

When OLTC is used without a change-over selector, the maximum operating positions available will be 18 positions with a changeover selector. (special design is excluded).

This operation instructions includes all the necessary information for the installation.

Type designation

The operating condition of OLTC

The temperature of oil under which the tap changer operates must not exceed 100ºC and not lower than

-25ºC .

The ambient temperature around the tap changer must not exceed 40ºC and not lower than -25ºC .

The non-perpendicularity of OLTC on the transformer against ground level should not exceed 2%

The space for mounting OLTC should be free from serious dust and other explosive and corrosive


Mechanical operation principle of the tap changer

Tap change operation begins with the electric motor of the motor drive unit. The driving force is

transferred to the worm gear box on the top cover of the tap changer through driving shaft and belt

pulley box,then the force is actuated to the energy accumulating mechanism and the shaft which

passes through the diverter switch sown to the cylinder bottom.

There the cylinder bottom gear clutch is connected to the Geneva wheel mechanism of the

tap selector. The rotation of Geneva wheel makes the contacting bridge to rotate an angle

corresponding to one step, thus the connecting bridge will be connected to the desired tap of the

tap winding without load.


Copyright © Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd All Rights Reserved.
QR Code