GE AKR-30 Series Maintenance Manual page 52

SECTION Type SST Overcurrent Trip Device (Cont.)
10-
SST TEST SET
1 0.4.1
The TAK-TS1 and TAK-TS2 Test Sets are portable in­
struments designed for field-checking the time-current
characteristics and pickup calibration of the SST's
various trip elements. It can verify the ability of the
Flux-Shift Trip, Device to trip the breaker and, in addi­
tion, includes means for continuity checking the phase
sensors. A TAK-TS1 Test Set is shown in Fig. 67. The
TAK-TS2 functions identically to and supersedes the
TAK-TS1 device. The TAK-TS2 can also test the Ver­
saTrip Mod 2 trip device.
BEFORE CONNECTING THE TEST SET
WARNING:
TO THE BREAKER TRIP DEVICE S YS TEM, EN­
SURE THA T THE CIRCUIT BREAKER IS COM·
PLETEL Y DISCONNECTED FROM ITS PO WER
SOURCE. ON DRAWOUT EQUIPMENT, RACK THE
BREA KER TO ITS DISCONNECTED POSITION.
VERIFY THAT THE BREAKER IS TRIPPED.
Either of two test modes may be employed:
"A" - Programmer Unit Only. These tests are con­
ducted with the programmer unit disconnected from the
breaker. During test, the unit can remain attached to the
breaker or may be completely removed from it.
NEVER DISENGAGE THE HARNESS
CAUTION:
CONNEC TOR FROM THE PROGRAMMER UNIT
ON A BREAKER THA T IS ENERGIZED AND CARRY­
ING LOAD CURRENT. THIS WILL OPEN-CIRCUIT
THE CURRENT SENSORS, ALLOWING DANGER­
OUS AND DAMAGING VOL TAGES TO DEVELOP.
Test scope:
1 .
Verify the time-current characteristics and pickup
calibration of the various trip elements.
2 . Verify operation of the SST target indicators on pro­
grammer units so equipped.
" 8 " - Complete
the programmer un1t must be mounted on the breaker and
connected to 1ts wiring harness.
Test scope •
1 .
All "A" tests prev1ously
swr tchrng the programmer's output to activate
optionally
the Flux· Shlft Tnp Device and verify its operation by physi­
cally tnpp m g the breaker.
2. Check phase sensor continuit y.
In the event that any component of the SST system does
not perform wrthrn the limits prescnbed
GEK-64454 . 1t should be replaced .
52
described, plus provision for
test instructions
m
1 0.4.2 RESISTANCE VALUES
For use in troubleshooting, the Common to Tap resist­
ance for SST current sensors is given in Table 8. These
values apply to both phase and neutral sensors.
TABLE SENSOR RESISTANCE VALUES
8 -
Ampere
TAP
1 00
1 50
225
300
300
400
600
800
600
800
1 200
1 600
800
1 200
1 600
2000
The coil resistance of the SST /ECS Flux shifter device is
approximately 1 6 ohms.
Resistance In Ohms
between COMMON
and TAP Terminals
2.2 - 2.6
3.3 - 3.9
5.1 - 5.8
6.8 - 7.8
5.3 - 6.1
7.2 - 8.2
1 0.8 - 1 2.4
1 4.6 - 1 6.9
6.4 - 7.6
8.8 - 1 0.4
1 3.5 - 1 5.8
1 9 .4 - 22.8
1 0.2 - 1 2.4
1 5.8 - 1 9.2
22.0 - 26.7
28.5 - 34.7