GE Multilin F650 Digital Bay Controller 5-75
5 SETPOINTS 5.4 PROTECTION ELEMENTS
5
Stage (1 - 2) Tap: This setpoint specifies the minimum Operation three-phase power for the Stage 1 (2) element. The
power value defined in this setpoint is the minimum distance between the source and the directional power characteristic.
This value can be positive or negative. A positive value would define a characteristic slip through the positive power axis,
while a negative value would move the characteristic through the negative axis. The value of this setpoint is defined in total
MW (primary) – the CT and VT value is considered in the calculations.
Stage 1 (2)Time: This setpoint specifies the delay for Stage 1 of the element. For reverse power or direct power
applications, usually Stage 1 is used for alarm functions, while Stage 2 is used for tripping functions.
Events: This setpoint enables or disables the generation of events. All states in this function are affected by this setpoint.
NOTE:
Even if the unit defined in this setpoint is MW, this does not necessarily mean that the resulting value and the RCA
setpoint are in MW. For example:
RCA : 30 º SMIN: 100 MW.
If we assume that there is only active power. The unit operation would be produced for a value of:
P = 100 / cos (30) = 115,7 MW.
If there was only reactive power:
Q = 100/sin (30) = 200,0 MVar.
(In this case the real Operation units are Mvar, even if SMIN is expressed in MW.)
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