Frequency - GE Multilin g60 Instruction Manual

Ur series generator protection system

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Table of Contents

10.1 SETTING EXAMPLE

10 APPLICATION OF SETTINGS

10.1.14 FREQUENCY

The pickup and delay settings are dependent on operating practices and system characteristics. In this example, two over-

frequency and two underfrequency elements will be used. The elements will be blocked when offline. Underfrequency will

initiate a trip. Overfrequency will alarm only. Either source may be assigned.

Make the following changes in EnerVista UR Setup or through the

CONTROL ELEMENTS

UNDERFREQUENCY 1(2)

CONTROL ELEMENTS

OVERFREQUENCY

10.1.15 ACCIDENTAL ENERGIZATION

In this example, the

is selected as "UV and Offline". The

ACCDNT ENRG ARMING MODE

ACCDNT ENRG OC PICKUP

should be set at ½ the minimum expected fault current. In this case, 1.0 pu (8000 A primary) is selected. In cases where it

is possible to re-energize the machine through its auxiliary transformer, a lower setting may be required. The undervoltage

pickup setting must be set above the maximum expected fault voltage.

Make the following changes in EnerVista UR Setup or through the

GROUPED ELEMENTS

SETTING GROUP

ACCIDENTAL ENERGIZATION

G60 Generator Protection System