GE Multilin 750/760 Feeder Protection System Digital Relay Protection

Ground Overcurrent Protection

Firmly grounded and low impedance grounded distribution systems require fast ground fault clearance to limit equipment damage.

the 750/760 provides ground fault protection with the following features

- Neutral IOC and TOC

- Grounding IOC and TOC

The 750/760 allows the use of directional elements to supervise ground overcurrent protection elements.

This means that the 750/760 can be used to provide sensitive tripping for unidirectional faults.

Typical applications for directional overcurrent protection include

- Isolating faulty feeders in ring bus or parallel feeder arrangements.

- Protection against faults in the return mains supply from generators in industrial plants

- Sensitive high-speed earth protection for transformers

Sensitive earthing and Restrictive Earth Fault (REF) protection

The sensitive earth and restricted earth fault protection function provides sensitive detection of earth faults.

Sensitive ground fault protection includes

- Instantaneous (50N) and timed (51N) - 2 levels

- Directional monitoring distinguishes between forward and reverse faults.

- Dual polarization (current and voltage) for maximum safety and reliability

750/ 760 for transformer backup protection (grounded converter windings and autotransformers) with RGF function.