The DTRV E7-TR device is a member of the EuroProt+ numerical protection relay, made by Protecta Co. Ltd. The EuroProt+ complex protection in respect of hardware and software is a modular device. The modules are assembled and configured according to the requirements, and then the software determines the functions.
The E7-TR is designed to give control over the tap- changer of power transformers. It also includes a powerful Automatic Tap Changer Control function (manual control included) along with voltage protection functions.