De-Energized (DETC)Or Off-Load Tap Changer For Oil Immersed Transformer

De-Energized (DETC)or Off-Load Tap changer for Oil immersed Transformer

Many electrical transformers are equipped with a manually operated tap changer switch on the high voltage winding known as a DETC or de-energized tap changer. This switch allows operators to change the number of turns in the high voltage winding based on the connected system input.

As the de-energized name implies, these voltage adjustments can only be made when the transformer windings are isolated because the switch is not designed or rated to interrupt high voltage electrical loads. Adjustments on a DETC are typically only made for seasonal weather changes and require an electrical outage.

The de-energized or off-load tap changer is normally mounted on the main transformer tank and is set to match the high voltage network supplying the transformer. 

Anhuang New Shape De-Energized (DETC)or Off-Load Tap changer for Oil immersed Transformer, which is smaller in shape but same function. It can reduce the cost and also freight charge.