Toc / Instantaneous Hdo Unit - Inverse Time - GE DIAC 66K Instruction Manual

GEK-106261
Table 6–1: PICKUP TIMES FOR VARYING MULTIPLES OF PICKUP (MPU)
CURVE
IAC 51
IAC 53
55-ST
57-MT
†
66-LT (Type 66K)
75-ST
IAC 77
95-ST
IEEE Inverse
IEEE Very Inverse
IEEE Extremely Inverse
IEC Inverse
IEC Very Inverse
IEC Extremely Inverse
Definite Time
2
I T
†
TD = 5
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.
GE Power Management
PICKUP TIMES (IN SECONDS)
2 MPU
3.62 to 4.05
6.66 to 7.36
0.298 to 0.330
20.40 to 22.62
42.7 to 47.2
0.748 to 0.827
6.49 to 7.17
0.895 to 0.994
3.59 to 3.99
6.51 to 7.24
8.76 to 9.73
4.73 to 5.26
6.310 to 7.014
12.3 to 13.7
4.71 to 5.24
1.175 to 1.310
6.6 TOC / INSTANTANEOUS HDO UNIT – INVERSE TIME
DIAC Type 66K Digital Overcurrent Relay
6 ACCEPTANCE/PERIODIC TESTS
5 MPU
1.69 to 1.86
1.25 to 1.37 0.687 to 0.759
0.155 to 0.170 0.133 to 0.140
8.82 to 9.75
17.28 to 19.10 10.78 to 11.90
0.3113 to 0.3440 0.2440 to 0.2707
0.859 to 0.954 0.266 to 0.296
0.356 to 0.396 0.276 to 0.303
1.59 to 1.76
1.21 to 1.34
1.18 to 1.32 0.374 to 0.412
2.00 to 2.22
1.56 to 1.73 0.690 to 0.768
1.51 to 1.67 0.369 to 0.410
4.71 to 5.24
0.191 to 0.212 0.051 to 0.056
10 MPU
1.19 to 1.32
5.7 to 6.3
1.12 to 1.25
0.64 to 0.71
1.39 to 1.54
6
4.71 to 5.21
6-
3