CHAPTER 4: KEYPAD SETPOINTS
S8 POWER ELEMENTS
369 MOTOR MANAGEMENT RELAY – QUICKSTART GUIDE
4–45
If the 369 is applied on a synchronous motor, it is desirable not to trip or alarm on kvar until
the field has been applied. Therefore, this feature can be blocked until the motor comes up
to speed and the field is applied. From that point forward, the kvar trip and alarm elements
will be active. Once the kvar level exceeds the positive level, for the specified delay, a trip or
alarm will occur indicating a positive kvar condition. The reactive power alarm can be used
to detect loss of excitation and out of step.
4.6.5
Negative Reactive Power
PATH: S8 POWER ELEMENTS
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NEGATIVE REACTIVE POWER
When using the 369 on a synchronous motor, it is desirable not to trip or alarm on kvar
until the field has been applied. As such, this feature can be blocked until the motor comes
up to speed and the field is applied. From that point forward, the kvar trip and alarm
elements will be active. Once the kvar level exceeds the negative level for the specified
delay, a trip or alarm occurs, indicating a negative kvar condition. The reactive power
alarm can be used to detect overexcitation or loss of load.
POSITIVE kvar
TRIP DELAY: 1.0 s
Range: 0.1 to 255.0 s in steps of 0.1
NEGATIVE REACTIVE
POWER (kvar)
BLOCK -kvar ELEMENT
FROM START: 1 s
Range: 0 to 5000 s in steps of 1
NEGATIVE kvar
ALARM: Off
Range: Off, Latched, Unlatched
ASSIGN ALARM RELAYS:
Alarm
Range: None, Alarm, Aux1, Aux2, or combinations
NEGATIVE kvar ALARM
LEVEL: 10 kvar
Range: 1 to 25000 kvar in steps of 1
NEGATIVE kvar
ALARM DELAY: 1.0 s
Range: 0.1 to 255.0 s in steps of 0.1
NEGATIVE kvar
ALARM EVENTS: Off
Range: Off, On
NEGATIVE kvar
TRIP: Off
Range: Off, Latched, Unlatched
ASSIGN TRIP RELAYS:
Trip
Range: None, Trip, Aux1, Aux2, or combinations
NEGATIVE kvar TRIP
LEVEL: 25 kvar
Range: 1 to 25000 kvar in steps of 1
NEGATIVE kvar
TRIP DELAY: 1.0s
Range: 0.1 to 255.0 s in steps of 0.1