Overview

The relay features generator unbalance, generator differential, over excitation, loss of

excitation, 3rd harmonic neutral undervoltage, over and under frequency, synchrocheck

and other essential functions with a basic order option. Additionally available with an

advanced order option are overall differential (to protect the transformer-generator

combined), directional overcurrent elements, restricted ground fault, 100% stator ground,

out-of-step protection, rate of change of frequency, power factor, harmonic detection,

frequency out-of-band accumulation and others. An optional RTD module allows for

thermal protection and monitoring. An optional analog inputs/outputs module allows for

monitoring of generator excitation current, vibration and other parameters.

These relays contain many innovative features. To meet diverse utility standards and

industry requirements, these features have the flexibility to be programmed to meet

specific user needs. This flexibility will naturally make a piece of equipment difficult to

learn. To aid new users in getting basic protection operating quickly, setpoints are set to

typical default values and advanced features are disabled. These settings can be

reprogrammed at any time.