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DET-882 SecoGear Medium-voltage Switchgear Application and Technical Guide

System and Equipment Protection

SECTION 4. SYSTEM AND EQUIPMENT PROTECTION

This section covers some basic considerations used when

selecting relays for the protection of medium-voltage

power systems. It is organized by protection packages with

respect to equipment type generally encountered in

medium voltage systems. Feeders, incoming lines, bus,

transformers, motors, generators and metering will be

covered.

Protection considerations can be provided by single-phase

or multifunction three-phase relays, which may include

phase and ground directional, non-directional relays,

overcurrent, differential, directional power, under-

frequency, and under-/overvoltage relaying.

Many benefits are provided by newer multifunctional

digital relays; expanded relay functions, digital metering,

diagnostics, reduction in relay costs per function, reduction

in wiring and increased panel space with the reduction in

the quantity of relays. GE Multilin Relay product reference

guide can be found at www.GEMultilin.com or directly at

GE SecoGear Application Guide

Other manuals for GE SecoGear