Manual for RET 541, RET 543, RET 545

The RET 541/543/545 transformer terminals are designed for protection, control, measurement, and supervision of two-winding power transformers and generator-transformer blocks in distribution networks. They offer advanced protection functions, including three-phase current differential protection, restricted earth-fault protection, and overcurrent/earth-fault back-up protection. The terminals also provide measurement capabilities for currents, voltages, frequency, and power, along with condition monitoring functions for circuit breakers and trip circuits. Integrated communication protocols allow flexible integration into substation automation systems. Optional functions include automatic on-load tap-changer control and voltage regulation.