Trip Characteristics - GE AKR-4-30 Maintenance Manual Supplement

GEI-86134, Power Circuit Breakers
SST phase sensor with tap board
Fig. 18.
X • Trip Rating
•Sensor Tap
F rame
(
--
Breaker
-
Size
T ype
(Amperes)
100,150,225,300
AKR-30 800
300,400,600,800
300,400,600,800
AI{R-50 1600
600,800,1200,1600
AKRT-50 2000 1600,2000
CD
Pickup tolerance is ±. 9%
®
Pickup tolerance is±. 10%
16
SST TRIP CHARACTERISTICS
in Amperes
Long Time
)
-
--- CD
----
Pick (•L)
Sensor
( )
Ampere
Multiple Band
Taps
of X
(Seconds)
- or-
Maximum
.6, .7, .8,
.9, 1.0,
Intermed.
-or-
1.1 (X)
Minimum
800,1200,
®
Time delay shown at 600% of long time pickup setting (6L), at lower limit of band.
@
Time delay shown at lower limit of band.
(See pages 28, 29 and 30 for applicable time-current curves)
Fig. 19.
TABLE 4
SST PR OGRAMMER ADJUSTMENT RANGE (Set Points)
Short Time
Time Pickup Time
®
(
)
@ @)
Delay Delay
Multiple Band
ofL (Seconds)
3, 4, 5,
6,8,10 (L)
Maximum
-or-
22 0.35
Int .. rmed.
1.75, 2,
0.21
10
2.25, 2.5,
Minimum
3,4 (L)
4 0.095
600- 1600 A
300 -BOO A
100 - 300 A
SST Neutral sensors
GROU ND FAULT
Instantaneous
Pickup Pickup
Time
® ®
( ) ( )
Delay
Multiple Multiple Band
ofL of X (Seconds)
.4, .5, .6,
.8, 1.0,
1.2 (X)
Maximum
4, 5,6 ,
0.30
.25, .3, .4,
8, 10, 12 (L)
Intermed.
.5, .6,
0.165
.7 (X)
Minimum
0.065
.2, .25, .3,
.4, .5,
.6 (X)
@