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Directional Overcurrent Ground Relays
Types IRP, IRC and IRD
RELAY
RATING
0.5-2.5 Amps
2-6 Amps
4-12 Amps
0.5-2.5 Amps
2-6 Amps
4-12 Amps
†
Short circuit the voltage polarizing at the relay terminals before making the above adjustment.
PERMANENT MAGNET ADJUSTMENT
TIME
OVERCURRENT
UNIT TYPE
2
5
6
7
8
9
11
DIRECTIONAL UNIT CALIBRATION
CURRENT
BOTH PLUGS IN CONDITION
AMPERES
5 - 80
Spurious Torque in contact
closing direction (left front view).
5 - 80
5 - 80
Spurious Torque in contact
opening direction (right front
view, contacts remain open).
5 - 80
TIME CURVE CALIBRATION DATA – 60 HERTZ
TIME
CURRENT
DIAL
(MULTIPLES OF
POSITION
TAP VALUE)
6
3
6
2
6
2
6
2
6
2
6
2
6
2
2
TABLE
3
TABLE
ELECTROMAGNET PLUGS
OPERATING
TIME
SECONDS
0.57
37.80
2.46
4.27
13.35
8.87
11.27
†
ADJUSTMENT
Right (front-view) plug
screwed out until
Spurious Torque is
reversed.
Left (front view) plug
screwed out until
Spurious Torque is in
contact closing direction.
Then the plug is screwed
in until Spurious Torque
is reversed.
OPERATING
CURRENT
(MULTIPLES OF
SECONDS
TAP VALUE)
20
10
14.30
20
20
20
20
20
41-133S
TIME
0.22
1.19
1.11
1.11
0.65
0.24
11
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