Woodward EGCP-2 - Figure 4-21. Generator Over;Under Frequency

Manual 26174 EGCP-2 Engine Generator Control Package
Woodward 81
Generator High/Low Volt Limit Alarm
 Even if the Alarm Set Points for the High/Low Limits are Disabled, the
Voltage Bias will
not allow adjustment beyond these limits.
 The same is true for the synchronizer, which will not allow a gen breaker
closure if the High or Low Voltage limits are met or exceeded for a period of
time which exceeds the Gen Volt Timer Set Point. This is true even with
Voltage Matching disabled.
Voltage Alarm Delay
 Sets minimum time, in seconds, allowed prior to activating either Generator
High/Low Voltage Limit Alarms. This allows for short period transient
over/under voltages to occur on the generator without setting off the
Generator Voltage Alarms.
Generator Frequency High Limit
 Sets maximum allowable generator frequency level.
 If frequency is above High Limit, generator is not considered stable, and is
unfit for breaker closure.
Generator Frequency Low Limit
 Sets minimum allowable generator frequency level.
 If frequency is below Low Limit, generator is not considered stable, and is
unfit for breaker closure.
Synchronous Speed (50/60 Hz)
Generator Low Frequency Limit (Speed Bias Cutout)
Operating Range
Generator High Frequency Limit (Speed Bias Cutout)
Figure 4-21. Generator Over/Under Frequency
Generator High/Low Frequency Limit Alarm
 Even if the Alarm Set Points for the High/Low Limits are Disabled, the
Speed Bias will not allow adjustment beyond these limits.
 The same is true for the synchronizer, which will not allow a gen breaker
closure if the High or Low Frequency limits are met or exceeded.