GE AKR-30 Series Maintenance Manual page 178

SECTION 1 5-EC Trip Device
Type E C overcurrent trip devices are magnetically
operated, using a series coi l or single conductor, and an
associated magnetic structure to provide tripping force.
There are three basic characteristics: long time delay,
short time delay and instantaneous, which can be used in
various combinations to suit the appl ication.
AKR breakers with EC Trips are for use on DC system
voltages. One EC trip device is mounted per breaker pole.
Thi s device contains its functional adj ustments.
FIG. 1 1 9 - EC-2A TRIP DEVICE
Trip
CD
Device Pickup
80·1 60% X
EC-2A
( ± 1 0%)
80·1 60% X
EC-1 ( ± 1 0%)
80-160% X
EC- 1 8 ( ± 1 5%)
Trip device ampere rating. If trip devices are set above
1 X =
At lower limit of band at times pickup setting.
2 6
At lower limit of band at times pickup setting.
3 211 2
4 Low-set instantaneous. Not available in combination with long time delay.
84
TABLE 17 EC DEVICE TRIP C HARACTERISTICS
Long
Time
l y
®
De
a
sec.
( 1 A) MAX.-adj. 1 5-38
or
ad . sec.
( 1 8) INTER.- j 7 5- 1 8
or
sec.
( 1 C) M I N .-adj . 3 3-8.2
sec.
( 1 A) MAX.-30
or
sec.
( 1 8) INTER.-1 5
or
sec.
( 1 C) MIN.-5
sec.
( 1 88) MAX.-4.5
or
sec.
( 1 CC) MIN.-2
for coordination purposes, such sett1ngs do not 1ncrease
1 00%
The standard EC trip device for breaker frames up to
2000 amps is the type EC-2A, see Fig. 1 1 9. An optional trip
device for these frames i s the type EC-1 , see Fig. 1 20.
Tri p characteristics are for the EC devices are g iven in
Table 1 7 .
The time-current characteristics for the EC trip devices
are g iven in the fol lowi ng curves:
G ES-6000 EC-1
G ES-601 0 EC-2/2A 1 A-3
G ES-601 1 EC-2/2A 1 B-3
G ES-6012 EC-2/2A 1 C-3
FIG. 1 20 - EC-1 TRIP DEVICE
Short
Time
Delay
Pickup
(2A) MAX.-.23
or
2-5X,
or
3-7X (28) INTER.-. 1 5 sec.
4-1 0X or
(2C) MIN.-.07
(2AA) MAX.-.20
or
2·5X,
or
3-7X (288) INTER.-. 1 3
or
4- 1 0X
(2CC) MIN.-.07
lnatantlineoue
Pickup
<!l
4-9X,
6-12X,
9-15X or
@)
80-250%X
sec.
High Set
up
to 1 5X,
sec.
Non-Adjustable
sec.
4·9X,
sec.
6·12X,
9-15X or
@)
sec.
80-250% X
the breaker's continuous current rat1ng.