GEK-45376
TABLE 9
Hi-
Hz Link
Range
Min.
Burdens at Min.
Burdens In
Seismic
Position
(Amps)
Pickup
Pickup (Ohms)
Ohms (Z)
Inst. Unit
(Amps)
Times Pickup
(Amps)
R
Jx
z
3
10
20
L
2-10
2
0.750
0.650
0.992
0. 634
0.480
0. 457
2-50
60
H
10-50
10
0.070
0.024
0.074
0.072
0.071
0.070
6-150
60
L
6-30
6
0.110
0. 078
0.135
0.095
0.081
0.079
H
30-150
30
0.022
0. 005
0.023
0.022
0.022
0.022
L
2-10
2
0.625
o·.
542
0.827
0.528
0.400
0. 380
2-50
50
H
10-50
10
0.058
0.020
0.062
0.060
0.059
0.058
L
6-30
6
0.092
0.065
0. 112
0.079
0.068
0.066
6-150
50
H
30- 150
30
0. 018
0.004
0.019
0.018
0.018
0.0 18
The Hi-Seismic high drop-out instantaneous unit burdens are listed in Table 10.
Hi-
Seismic
High
Drop out
Inst. Unit
(Amps)
2-8
2-8
T IME OVERCURRENT UNIT
Pickup
Hz
60
50
Movable
Range
Lead
(Amps)
Position
L
2-4
H
4-8
L
2-4
H
4-8
TABLE 10
Min.
Burdens at Min.
Burdens In
Pickup
Pickup (Ohms)
Ohms (Z)
Amps
Times Pickup
R
Jx
z
3
10
20
2
0.69
0.62
0. 93
0.55
0.4 1
0.38
4
0.30
0 . 22
0.37
0.25
0.21
0. 20
2
0.58
0.52
0.78
0.46
0.34
0. 32
4
0. 25
0.18
0. 3 1
0 . 2 1
0.18
0. 17
CHARACTER IST ICS
Pickup in these relays is defined as the current required to close the contacts from the 0.5 time-dial
position. Current settings are made
by
means
of
two
movable
leads which connect to the tap block at the top
of the support structure, see Figure 1. The tap block is marked A through M. See the nameplate on the relay
for tap settings.
Example:
The 5 amp tap for a 2.5 to 7.5 IFC66 time overcurrent relay requires one movable lead in position 0
and the other in position
J.
Operating Time Accuracy
The IFC relays should operate within �7 percent of the published time curve. Figures 6 and 7 show
the various time-current characteristics for the IFC relays. The setting of the time dial determines
the length of time required to close the contacts for a given current. The higher the time-dial setting
the longer the operating time.
The contacts are just closed when the time dial is set to zero. The maximum time setting occurs when
the time dial is set to 10 and the disk has to travel its maximum distance to close the contacts.
8
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