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GEK-26437
Contacts
The contacts of these distance relays when closed due to a fault, will momentarily carry 30 amperes up
jltS
d-c.
However, the circuit breaker trip circuit must be opened by an auxiliary switch or by some
other suitable means since the relay contacts do not have an interrupting rating.
Target/Seal-in Unit
The relays have a 0.6/2.0 ampere d-c tap rating.
The electrical parameters are listed in Table IV.
TABLE IV
TARGET SEAL-IN UNIT
0.6 AMP TAP
2.0 AMP TAP
Minimum Operating
0.6 amps
2.0 amps
Carry Continuously
1.5
mps
3.5 amps
Carry 30 Amps for
0.5 secs.
4
secs.
Carry 10 Amps for
4
secs.
30
secs
0-C Resistance
0.6 ohms
0.13 ohms
60 Cycle Impedance
6
ohms
0.53 ohms
BURDENS
Current Circuits
The maximum current burden Imposed on each
GCY51F(-)A relays is shown in Table V.
AMPS
HERTZ
R
X
P.F.
W.
5
60
0.3
0.05
0.98
7.5
7.6
This data is for the 3.0 ohm basic reach tap of the M 1 and M 2 units.
The burden with the M 1 unit in
the 1.5 or 0.75 ohm tap or with the M 2 unit in the 2 or 1 ohm tap will be slightly lower.
Potential Circuits
The maximum potential burden imposed on each potential transformer at 120 volts, 60 hertz
Table VI for restraint transformer settings at 100 percent.
TABLE VI
is shown in
CIRCUIT
I
R
JX
P.F.
WATTS
V.A.
M 1 Restraint
3200
JO
1.0
4.5
4.5
N 1 Polarizing
1300
-J680
0.89
8.7
9.8
M 2 Restraint
1150
+J]370
0.64
5.2
8.1
M 2 Polarizing
1440
-J217
0.99
9.7
9.8
The potential burdens at restraint
from toe following formula.
transformer settings of less than 100 percent can he calculated
,
Unit
VA
(a
+
Jb)rMl
tap
setting()1
2
+
(C
+
Jd)
[input tap setting (j_J
1 2GCY51 F1A
current transformer at five amperes for a set of three
TABLE V
6
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