Manual 37353A
MFR 13 Packages - Protection Relay
Page 56/91
© Woodward
Reverse/Reduced Power Monitoring
NOTE
All percentage values refer to a percentage of the configured rated power (page 37).
Function:
"Active power not within the permissible range"
The generator power limits may be configured as reduced power or reverse power depending on the threshold
value configured in the control. If the single-phase or three-phase measured real power is below the adjusted
limit of the reduced load or below the adjusted value of the reverse power, an alarm will be issued. The message
"
Rev. Power
" appears. This message can be suppressed with the discrete input "Blocking of protective device
/ remote acknowledgement".
Reverse/min.pow.
Monitoring ON
Reverse/reduced power monitoring
ON/OFF
ON
................Reverse/reduced power monitoring is enabled. The subsequent
screens of this function are displayed.
OFF
..............Reverse/reduced power monitoring is disabled. The subsequent
screens of this function are not displayed.
Reverse/min.pow.
-00%
Threshold reverse/reduced power
-99 to 99 %
Reverse power monitoring:
If the direction of the active power reverses and the
measured power value falls below the configured negative percent-
age value, the unit issues the message "
Rev. Power
".
Reduced power monitoring:
If the measured power falls below the configured
positive percentage value, the unit issues the message "
Rev.
Power
".
If a relay was assigned to this function in the relay manager, that relay will be ener-
gized.
Reverse/min.pow.
Delay 00.00s
Pickup delay
0.02 to 99.98 s
In order to initiate an reverse/reduced power alarm, the measured active load must
exceed and remain above the configured threshold without interruption for at least
the period of time specified in this screen.
Reverse/min.pow.
Hysteresis 00%
Hysteresis for the reverse/reduced power monitoring
0 to 99 %
In order to prevent system fluctuations from continually initiating reverse/reduced
power alarms, a lower release point is defined here. If the control monitors the ac-
tive load above the permissible limit, the load must drop below the percentage of
the rated load defined here for the fault condition to be recognized as no longer ex-
isting.
