Operation Manual 37107F
MFR 3 - Multi Function Relay
© Woodward
Page 109/165
Generator Overvoltage Monitoring
The line-to-line voltage is monitored to detect overvoltage conditions.
Function: "
Generator voltage not within the permissible range"
At least one phase of the generator voltage is outside of the limit values configured for overvoltage. The enabling
of generator overvoltage monitoring is delayed via "Delayed monitoring" in order to enable correct generator
start-up. An alarm is issued if a fault condition is detected.
Parameter
163
Gen.overvoltage
monitoring ON
Generator overvoltage
ON/OFF
ON
................ Generator overvoltage monitoring is enabled. The subsequent screens
of this function are displayed.
OFF
.............. Generator overvoltage monitoring is not performed. The subsequent
screens of this function are not displayed.
Parameter
164
Gen.overvolt. 1
U > 000V
Generator overvoltage: limit 1
[1] 20 to 150 V; [4] 20 to 520 V
The value for overvoltage limit 1 is configured in this screen. If the monitored vol-
tage reaches or exceeds this level for the configured delay time, the unit issues an
alarm and opens the GCB. This value refers to the secondary voltage of the genera-
tor PT inputs (Parameter 15).
Tripping of class F3 alarm
Parameter
165
Gen.overvolt. 1
Delay 00.00s
Generator overvoltage: delay 1
0.02 to 99.98 s
The generator overvoltage monitoring threshold limit 1 must be exceeded, without
interruption, for the time period configured here before the configured relay will be
energized.
Parameter
166
Gen.overvolt. 2
U > 000V
Generator overvoltage: limit 2
[1] 20 to 150 V; [4] 20 to 520 V
The value for overvoltage limit 2 is configured in this screen. If the monitored vol-
tage reaches or exceeds this level for the configured delay time, the unit issues an
alarm and opens the GCB. This value refers to the secondary voltage of the genera-
tor PT inputs (Parameter 15).
Tripping of class F3 alarm
Parameter
167
Gen.overvolt. 2
Delay 00.00s
Generator overvoltage: delay 2
0.02 to 99.98 s
The generator overvoltage monitoring threshold limit 1 must be exceeded, without
interruption, for the time period configured here before the configured relay will be
energized.