Manual 37353A
MFR 13 Packages - Protection Relay
Page 58/91
© Woodward
Reactive Power Monitoring
NOTE
All percentage values refer to a percentage of the configured rated power (page 37).
Function:
"Reactive power not within the permissible range"
The control may monitor the reactive power and provide protection against excessive inductive (over excitation)
or capacitive (under excitation) load conditions. The control will display "
React.pow+
" or "
React.pow-
" if
the inductive or capacitive load has exceeded the permissible limits. This message can be suppressed with the
discrete input "Blocking of protective device / remote acknowledgement".
Reactive power
Monitoring ON
Reactive power monitoring
ON/OFF
ON
................Reactive power monitoring is enabled. The subsequent screens of
this function are displayed.
OFF
..............Reactive power monitoring is disabled. The subsequent screens of
this function are not displayed.
Cap. react. pow.
Response v.000%
Threshold reactive power, capacitive
0 to 100 %
The capacitive reactive power threshold is defined by this parameter. The percent-
age configured here refers to the configured rated power (refer to page 37). If this
limit is reached or exceeded, the unit outputs the message "
React.pow-
". If a re-
lay was assigned to this function in the relay manager, that relay will be energized.
Cap. react. pow.
Delay 00.00s
Pickup delay
0.02 to 99.98 s
In order to initiate a capacitive reactive power alarm, the measured capacitive reac-
tive load must exceed and remain above the configured differential threshold with-
out interruption for at least the period of time specified in this screen.
Ind. react. pow.
Response v.000%
Threshold reactive power, inducitive
0 to 100 %
The inductive reactive power threshold is defined by this parameter. The percent-
age configured here refers to the configured rated power (refer to page 37). If this
limit is reached or exceeded, the unit outputs the message "
React.pow+
". If a re-
lay was assigned to this function in the relay manager, that relay will be energized.
Ind. react. pow.
Delay 00.00s
Pickup delay
0.02 to 99.98 s
In order to initiate an inductive reactive power alarm, the measured inductive reac-
tive load must exceed and remain above the configured differential threshold with-
out interruption for at least the period of time specified in this screen.
React. pow. mon.
Hysteresis 00%
Hysteresis for the reactive power monitoring
1 to 20 %
In order to prevent system fluctuations from continually initiating reactive power
alarms, a lower release point is defined here. If the control monitors the capacitive
or reactive load above the permissible limit, the reactive load must drop below the
percentage defined here for the fault condition to reset for the fault condition to be
recognized as no longer existing.
