RET316*4 HESG448750M2 ABB Transformer Protection Relay

Description

The ABBRET316*4 (HESG448750M2)is a digital transformer differential protection relay engineered for medium- and high-voltage power systems. It delivers rapid and selective protection fortwo- or three-winding transformers, includingautotransformersand generator step-up units. This relay incorporates87T differential,overcurrent,thermal overload, andvoltage protectionfunctions to safeguard transformers against internal faults and abnormal operating conditions. Its numerical logic, programmable I/O, and robust fault supervision help ensure grid stability and rapid fault clearance. Designed for reliability, the RET316*4 is widely used in bothutility substationsandindustrial distribution networks. Its compact module format makes it suitable for new installations and modernization projects with limited panel space.