SECTION 1 0-Type SST Overcurrent Trip Device (Cont.)
1 0.4.1 SST TEST SET
The TAK-TS1 and TAK-TS2 Test Sets are portable in
struments desig ned for field-checking the time-current
characteristics and pickup calibration of the SST's
various trip elements. It can verify the abil ity of the
Fl ux-Sh ift Trip, Device to tri p the breaker and, i n addi
tion, incl udes means for conti n u ity che.cking the phase
sensors. A TAK-TS1 Test Set is shown in Fig. 67. The
TAK-TS2 functions identical ly to and supersedes the
TAK-TS1 device. The TAK-TS2 can also test the Ver
saTrip Mod 2 tri p device.
WARNING :
BEFORE CONNECTING THE TEST SET
TO THE BREA KER TRIP DEVICE S YSTEM, EN
SURE THA T THE CIRCUIT B REAKER IS COM
PLETEL Y DISCONNEC TED FROM ITS PO WER
SOURCE. ON DRA WOUT EQUIPMENT, RACK THE
BREA KER TO ITS DISCONNECTED POSITION.
VERIFY THA T THE BREA KER IS TRIPPED.
Either of two test modes may be employed:
"A" -
Unit
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.
CAUTION :
NEVER DISENGAGE THE HARNESS
CONNECTOR 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 VOLTAGES 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.
"B"
-
Device
For these tests,
the programmer unit must be mounted on the breaker and
connected to its wiring harness.
Test scope:
1 .
All "A" tests previously described, plus provision for
optionally switching the programmer's output to activate
the Flux-Shift Trip Device and verify its operation by physi
cally tripping the breaker.
2. Check phase sensor continuity.
In the event that any component of the SST system does
not perform within the limits prescribed in test instructions
G EK-64454, it should be replaced.
52
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 8 - SENSOR R ESISTANCE VALUES
Resistance in Ohms
Ampere
between COMMON
TAP
and TAP Termi nals
1 00
2 . 2 -
2.6
1 50
3 .3 -
3.9
225
5 . 1 -
5 . 8
300
6 . 8 -
7.8
300
5.3 -
6 . 1
400
7 . 2 -
8 . 2
600
1 0. 8 - 1 2 .4
800
1 4.6 - 1 6 . 9
600
6.4 -
7 . 6
800
8 . 8 - 1 0 .4
1 200
1 3 .5 - 1 5 . 8
1 600
1 9 .4 - 22.8
800
1 0.2 - 1 2.4
1 200
1 5 .8 - 1 9 .2
1 600
22.0 - 26 . 7
2000
28.5 - 34 . 7
The coil resistance of the SST/ECS Flux shifter device is
approximately 16 ohms.
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