Tap changer for transformers

Tap changer for transformers

The tap changer of a transformer is an important component used to regulate the output voltage of the transformer. It adjusts the voltage by changing the connection point (tap) of the transformer winding, ensuring the stability of the grid voltage and the adaptability of the load. The following is a detailed introduction to transformer tap changer:

Type of tap changer

1. On load tap changer

Working principle: During the operation of the transformer, the tap position can be adjusted online without the need for power outage. This type of switch prevents arcing and transient overvoltage during gear shifting through transition resistance or transition reactance.

Application scenario: Suitable for large power transformers that require frequent voltage regulation, such as power grid main transformers and large industrial transformers.

2. Off load tap changer

Working principle: Adjustments can only be made when the transformer is powered off or shut down. This type of switch has a simple structure, low cost, but poor adjustment flexibility.

Application scenario: Suitable for small transformers with infrequent load changes or situations that require a fixed output voltage.