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