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GE Power Management
DIAC Type 66K Digital Overcurrent Relay
6-
3
GEK-106261
6 ACCEPTANCE/PERIODIC TESTS
6
6.6 TOC / INSTANTANEOUS HDO UNIT – INVERSE TIME
The TOC/ Instantaneous HDO unit is designed similarly to a hinged armature instantaneous unit.
a) PICKUP VERIFICATION
•
Connect the relay as indicated in Figure 6–2: DIAC 66K TOC INVERSE TIME TEST SETUP. In order to
apply current to the relay, use a 50/60 Hz voltage source, with a variable resistor in series, or an electronic
current source.
•
Set the TOC unit at the desired pickup and the Instantaneous HDO unit by setting the Instantaneous cur-
rent pickup to lowest possible setting not including zero. This will allow the Instantaneous HDO unit to
operate without affecting the TOC trip time which is coordinated with the Instantaneous HDO unit.
Apply current to the relay and verify that the Pickup LED on the front of the relay lights between 98% and 102%
of the pickup TOC setting. If the relay is set to blink between power up and pickup, please set it not to blink.
Reduce the current applied, verifying that at a value between 95% and 100% of the pickup TOC, the relay
Pickup LED turns off or blinks if set to blink.
Table 6–1: PICKUP TIMES FOR VARYING MULTIPLES OF PICKUP (MPU)
CURVE
PICKUP TIMES (IN SECONDS)
2 MPU
5 MPU
10 MPU
IAC 51
3.62 to 4.05
1.69 to 1.86
1.19 to 1.32
IAC 53
6.66 to 7.36
1.25 to 1.37
0.687 to 0.759
55-ST
0.298 to 0.330
0.155 to 0.170
0.133 to 0.140
57-MT
20.40 to 22.62
8.82 to 9.75
5.7 to 6.3
66-LT (Type 66K)
†
42.7 to 47.2
17.28 to 19.10
10.78 to 11.90
75-ST
0.748 to 0.827
0.3113 to 0.3440
0.2440 to 0.2707
IAC 77
6.49 to 7.17
0.859 to 0.954
0.266 to 0.296
95-ST
0.895 to 0.994
0.356 to 0.396
0.276 to 0.303
IEEE Inverse
3.59 to 3.99
1.59 to 1.76
1.12 to 1.25
IEEE Very Inverse
6.51 to 7.24
1.21 to 1.34
0.64 to 0.71
IEEE Extremely Inverse
8.76 to 9.73
1.18 to 1.32
0.374 to 0.412
IEC Inverse
4.73 to 5.26
2.00 to 2.22
1.39 to 1.54
IEC Very Inverse
6.310 to 7.014
1.56 to 1.73
0.690 to 0.768
IEC Extremely Inverse
12.3 to 13.7
1.51 to 1.67
0.369 to 0.410
Definite Time
4.71 to 5.24
4.71 to 5.24
4.71 to 5.21
I
2
T
1.175 to 1.310
0.191 to 0.212
0.051 to 0.056
†
TD = 5
Содержание DIAC 66K
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