I_2H/I_1H
This module calculates the ratio of the second harmonic (I_2H) and fundamental
frequency (I_1H) phase currents. The calculated value is compared to the set Start
Value. If the calculated value exceeds the set Start Value, the module output is
activated.
Level detector
The output of the phase-specific level detector is activated when the fundamental
frequency current I_1H exceeds five percent of the nominal current.
Timer
Once activated, Timer runs until the set Operate Delay Time value. The time
characteristics is according to DT. When the operation timer has reached the Operate
Delay Time value, the BLK2H output is activated. After the timer has elapsed and the
inrush situation still exists, the BLK2H signal remains active until the I_2H/I_1H ratio
drops below the value set for the ratio in all phases, that is, until the inrush situation is
over.
Signals
Table 93: INRPHAR Input signals
Name
Type Default Description
I_2H_A SIGNAL 0 Second harmonic
phase A current
I_1H_A SIGNAL 0 Fundamental
frequency phase A
current
I_2H_B
SIGNAL 0 Second harmonic
phase B current
I_1H_B SIGNAL 0 Fundamental
frequency phase B
current
I_2H_C
SIGNAL 0 Second harmonic
phase C current
I_1H_C SIGNAL 0 Fundamental
frequency phase C
current
Table 94: INRPHAR Output signals
Name
Type Description
BLK2H BOOLEAN Second harmonic based block
1MRS757488 H Section 6
Commissioning
RIO600 145
Installation and Commissioning Manual
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