An Off Load Tap Changer is a transformer voltage adjustment device used to change the effective turns ratio of a transformer by selecting a suitable tap on its winding. It is intended for situations where voltage correction or adjustment is required while the transformer is taken out of service.
 
The tap changer provides a range of preset positions, enabling the transformer winding connection to be adjusted according to the desired voltage level. Once the required position is selected, the transformer can be returned to service with the selected voltage ratio.
This makes an Off Load Tap Changer a practical solution for transformers where voltage adjustment is required periodically rather than continuously during operation.
 
Features
Designed for manual transformer voltage adjustment
Multiple tap positions for different voltage settings
Suitable for distribution and power transformer applications
Strong mechanical operating arrangement
Reliable electrical contact between selected tap points
Available in different ratings and configurations
Suitable for oil immersed transformer installations
Can be selected according to transformer design and winding arrangement
Available with different operating shaft and mounting options

Transformer Applications
Off Load Tap Changers are commonly incorporated into distribution transformers, power transformers, industrial transformers and oil immersed electrical transformers. They can be useful where variations in incoming voltage or system conditions require the transformer ratio to be adjusted occasionally.
The required configuration depends on the transformer’s kVA rating, voltage class, winding current, tap range, number of positions and physical mounting arrangement. Selection should be made according to the transformer manufacturer's design and the required voltage adjustment range.
 
Off Load Tap Changer Supplier
Off Load Tap Changers are available in various specifications to suit different transformer designs and installation requirements. The correct selection depends on the electrical and mechanical parameters of the transformer, including tap configuration, current, voltage, number of positions and operating mechanism.