GE 489 - Manual (Page 81)

GE Multilin 489 Generator Management Relay 4-31
4 SETPOINTS 4.6 S5 CURRENT ELEMENTS
4
Figure 4–4: DIFFERENTIAL ELEMENTS
4.6.9 GROUND DIRECTIONAL
PATH: SETPOINTS ÖØ S5 CURRENT ELEMENTS ÖØ GROUND DIRECTIONAL
„ GROUND DIRECTIONAL
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SUPERVISE WITH
DIGITAL INPUTS: Yes
Range: Yes, No. Seen only if a digital input is assigned to
Ground Switch Status
GROUND DIRECTIONAL
MTA: 0°
Range: 0°, 90°, 180°, 270°
Note: MTA = Maximum Torque Angle
GROUND DIRECTIONAL
ALARM: Off
Range: Off, Latched, Unlatched
ASSIGN ALARM
RELAYS (2-5): ---5
Range: Any combination of Relays 2 to 5
GROUND DIR. ALARM
PICKUP: 0.05 x CT
Range: 0.05 to 20.00 × CT in steps of 0.01
GROUND DIR. ALARM
DELAY: 3.0 sec.
Range: 0.1 to 120.0 sec. in steps of 0.1
GROUND DIR. ALARM
EVENTS: Off
Range: On, Off
GROUND DIRECTIONAL
TRIP: Off
Range: Off, Latched, Unlatched
ASSIGN TRIP
RELAYS (1-4): 1---
Range: Any combination of Relays 1 to 4
GROUND DIR. TRIP
PICKUP: 0.05 x CT
Range: 0.05 to 20.00 × CT in steps of 0.01
GROUND DIR. TRIP
DELAY: 3.0 sec.
Range: 0.1 to 120.0 sec. in steps of 0.1
OPERATE
REGION
I (multiples of CT)
RESTRAINT
I
(m
u
lt
ip
le
s
o
f
CT
)
OP
E
RA
T
E
Slope 2 = 20%
808790A2.CDR
Slope 1 = 10%
Minimum Pickup = 0.10 x CT
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
0
ENTER
ESCAPE
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