Woodward EGCP-2 - Figure 3-17. AC Power Triangle

EGCP-2 Engine Generator Control Package Manual 26086
34 Woodward
Rated KW (numeric)
• Rated KW of Generator.
Rated KVA (numeric)
• Used to determine Rated Current (I) of Generator for minimum overcurrent
level.
• Equation used to determine Rated Current:
Voltage input is DELTA I = KVA x 1000
Voltage Ref x 1.73
Voltage input is WYE I = KVA x 1000
Voltage Ref x 3
Rated KVAR (numeric)
• Rated KVAR of Unit.
• Typically 0.6 x Rated KVA.
KVA
KW
KVAR
KW/KVA=PF
COS =KW/KVA
KVA^2=KW^2+KVAR^2
KVA= (KW^2 + KVAR^2)
Figure 3-17. AC Power Triangle
CT Ratio (numeric :5)
• Scales sensed CT input for Amperage as seen at generator.
• Used for Load Sensing Algorithm.
• (KVA, KW, KVAR, PF)
• Used for Alarms/Shutdowns.
• Over Current, KW Limits, Reverse Current, etc.
PT Ratio (numeric : 1)
• Scales sensed PT input to Voltage Levels as measured at the Generator.
• Used in Load Sensing Algorithm.
• (KVA, KW, KVAR, PF)
• Used for Voltage Matching.
• Used for Generator Frequency Detection.
• Used for Alarm/Shutdown sensing.
• Over/Under Voltage
• KW Limits, etc.