particular rotation direction, the reversed rotation direction can lead to an inefficient
cooling of the motor due to the fan design.
In a motor, the value of the negative-sequence component of the phase currents is very
negligible when compared to the positive-sequence component of the current during a
healthy operating condition of the motor. But when the motor is started with the phase
connections in the reverse order, the magnitude of I
2
is very high. So whenever the value
of I
2
exceeds the pickup value, the function detects the reverse rotation direction and
provides an operating signal that disconnects the motor from the supply.
4.4.3.6
Signals
Table 495:
46R Input signals
Name
Type
Default
Description
I
2
SIGNAL
0
Negative sequence current
BLOCK
BOOLEAN
0=False
Block signal for activating the blocking mode
Table 496:
46R Output signals
Name
Type
Description
TRIP
BOOLEAN
Trip
PICKUP
BOOLEAN
Pickup
4.4.3.7
Settings
Table 497:
46R Group settings (Basic)
Parameter
Values (Range)
Unit
Step
Default
Description
Pickup value
0.05...1.00
xIn
0.01
0.75
Pickup value
Trip delay time
100...60000
ms
10
100
Trip delay time
Table 498:
46R Non group settings (Basic)
Parameter
Values (Range)
Unit
Step
Default
Description
Operation
1=enable
5=disable
1=enable
Operation Disable / Enable
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
601
Technical Manual
Summary of Contents for Relion 615 series
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