4-22 F650 Digital Bay Controller GE Multilin
4.1 ENERVISTA 650 SETUP SOFTWARE INTERFACE 4 HUMAN INTERFACES
4
4.1.7.4 CONTROL ELEMENTS
This option shows all the control elements available in the relay as shown in Table 4–11:. Some of the elements are
grouped ones such as underfrequency, overfrequency and broken conductor.
Table 4–11: GENERAL OVERVIEW OF CONTROL ELEMENTS MENU:
CONTROL
ELEMENTS
Setting Group
F650 units incorporate a flexible grouping capability for protection units.
This means that protection units can be used in either single setting
group (default mode-all units can operate simultaneously) or three
setting groups (in this mode, protection units are grouped in three
independent tables, with only one of them active at a given time).
Protection element grouping involves only Protection elements together
with broken conductor detection and over and under frequency, which
are usually considered as control elements. The rest of control elements
such as recloser, fuse failure, breaker failure, synchronism, and breaker
settings are not involved in the tabled groups concept.
Underfrequency Underfrequency unit (81U). Grouped element
Overfrequency Overfrequency unit (81O). Grouped element
Synchrocheck Synchronism check unit (25). Not grouped, a single unit provided
Autoreclose Recloser (79). Not grouped, a single unit provided
Breaker Failure Breaker failure (50BF). Not grouped, a single unit provided
VT Fuse Failure Fuse Failure (VTFF). Not grouped, a single unit provided
Broken Conductor
Broken or fallen conductor detection function (I2/I1). Grouped element.
Ratio between the negative sequence current, I2, and the positive
sequence current I1. In normal and balanced load situations, this ratio is
zero, while in severe load fault conditions, an unbalance is produced and
this ratio is increased.
Locked Rotor Locked rotor detection function (48). Grouped element.
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