Usually, the main protections used by large-capacity transformers are:

Gas protection has the function of on-load voltage regulation, including body gas and on-load gas. Generally, heavy gas acts on tripping and light gas signals.

Transformer longitudinal differential protection generally adopts three-phase type.

Backup protection includes: overcurrent protection, compound voltage start-up locking overcurrent protection, negative sequence overcurrent protection, zero sequence current protection, temperature protection, etc.