GE Multilin G650 Manual page 170

5 SETTINGS
3 x VOLTS PER HERTZ (24) (Enhanced models only)
POWER
3 x DIRECTIONAL POWER (32)
3 x PWR FACTOR LIMITING (55) (Enhanced models only)
The G650 elements incorporate also the following control elements:
1 x SETTINGS GROUP
3 x OVERFREQUENCY (81O)
3 x UNDERFREQUENCY (81U)
1 x SYNCHROCHECK(25)
1 x BREAKER FAILURE (50BF) (Enhanced models only)
1 x FUSE FAILURE (VTFF) (Enhanced models only)
8 x PULSE COUNTERS (No group concept)
20 x ANALOG COMPARATORS (No group concept)
3 x FREQUENCY RATE OF CHANGE (81 df/dt)
3 x LOSS OF MAINS (78V) (Enhanced models only)
3 x LOSS OF EXCITATION (40)
3 x ACCIDENTAL ENERGIZATION (50/27)
G650 elements incorporate a flexible grouping capability for protection ELEMENTS. This means that protection elements
can be used in either one of the following modes:
a) SINGLE SETTING GROUPS
In this operation mode, all protection elements can be activated and operated simultaneously.
b) THREE SETTING GROUPS
In this mode, protection elements are grouped in three independent tables. Only one of them will be active at a given time.
A logic signal, e.g. a digital input, will select which table is active at each time, providing adaptive protection to each
network condition.
Protection element grouping involves only Protection elements together with broken conductor detection and active and
directional power, which are usually considered as control elements. The rest of the control elements such as recloser, fuse
failure, breaker failure, synchronism, and breaker settings are not involved in the tabled groups concept.
GEK-113285A G650 Generator Protection & Control System
5.4 PROTECTION ELEMENTS
5
5-27