Woodward EGCP-2 - Figure 3-20. Generator Over;Under Frequency

Manual 26086 EGCP-2 Engine Generator Control Package
Woodward 39
Generator High/Low Volt Limit Alarm
• Even if the Alarm Setpoints 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 Setpoint.
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 (numeric)
• 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 (numeric)
• 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 3-20. Generator Over/Under Frequency
Generator High/Low Frequency Limit Alarm
• Even if the Alarm Setpoints 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.
Speed/Frequency Mismatch Alarm
• Compares generator frequency to engine rpm and alarms on difference.
• Used to indicate loss of MPU, or Loss of Generator Field Voltage.