GE / Alstom MFAC High Impedance Bus Differential Relay

GE Alstom MFAC Relay : GE provides enhanced reliability through advanced protection for a wide range of bus protection applications. Our highly skilled technology teams understand bus bar principles and protection techniques, and use them to design, manufacture and support bus protection solutions that can be applied to a vast array of applications.
High magnitude fault currents require high speed operation of the bus bar protection to limit damage. However, this high speed clearing must be balanced against the need for security. Tripping incorrectly for an external fault may cause large outages and jeopardize power system stability. Learn more in our bus principles and protection guide.

MFAC relays provide high-speed differential protection for various types of power system plants including generators, reactors, busbars, motors and the individual windings of power transformers. MFAC relays are fast and reliable due to simple electromechanical construction and operate as a high impedance unit protection scheme with a wide range of setting.

Two versions for phase and earth fault protection

The MFAC relay operates as a high impedance unit protection scheme, with settings determined by a series of resistors. The resistors are selected on a seven-way plug bridge.

MFAC 14, a single element version, is applied only when earth fault protection is required. MFAC 34, comprised of three elements, provides both phase and earth fault protection.

Wide settings range with a simple, robust design

Ensuring high stability with through faults, MFAC relays benefit from a simple application technique. With ‘tuned to rated frequency’ and a wide settings range, the MFAC has a robust and straightforward design.

Wide settings range with a simple, robust design:
Ensuring high stability with through faults, MFAC relays benefit from a simple application technique. With ‘tuned to rated frequency’ and a wide settings range, the MFAC has a robust and straightforward design.

We offer GE?s century long tradition of power system innovation. From generators to transmission lines, to motors and beyond, we ensure dependable, safe power worldwide. GE offers a wide range of single function and auxiliary relays, along with a portfolio of accessories, to support high performing and reliable protection and control systems. To explore the GE portfolio with us click here GE numerical Relays !