Transformer Tap Changer

The tap changer is a tool changer for voltage transformation ratio of secondary operations that are better than the network voltage / primary changes.

There are two ways of working tap changer:
1. Changing the tap in a state of no-load transformer. Tap changer that can only operate to move the transformer tap transformer in a state of no load, called "Off Load Tap Changer" and can only be operated manually

2. In a state transformer tap changing under load. Tap changer that can operate to move the tap transformer, the transformer under load condition, called "On Load Tap Changer (OLTC)" and can be operated manually or automatically