Anticipative Algorithm; High Slip Closing Permission Signal - GE Multilin F650 Instruction Manual

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5.5 CONTROL ELEMENTS
The Closing process using anticipative algorithm is described on the following figure:
Where:
V
Referenced phasor (the one with lower frequency)
ref
V
Actual voltage phasor (the one with lower frequency)
s
V'
Calculated voltage phasor, depending on the set breaker closing time (anticipative algorithm)
s
5
ϕ
360º *TCB * Δ f = Calculated angle for phasor V'
TCB
Breaker Closing time defined by setpoint
Δf
Frequency slip (mHz) between phasors
ϕ
Angle difference set as maximum angle difference ( Δϕ
1
ϕ
=
Angle difference between V
2
the angle set as maximum angle difference.
Closing permission is given when V'
If the frequency slip is high, it is possible that as soon as the window defined by two times the maximum angle difference
) is entered, the relay will produce a closing permission output, if it is guaranteed that the projected phasor will be within
2
the limit marked by the setpoint, as shown in the following figure.
5-86
V
R e f
Figure 5–21: ANTICIPATIVE ALGORITHM
The algorithm starts operating when ϕ
and V
ref
s.
is over V
, which means that line and busbar voltages are in phase.
s
ref
ϕ
1
V
R e f
V '
s
Figure 5–22: HIGH SLIP CLOSING PERMISSION SIGNAL
F650 Digital Bay Controller
ϕ
2
ϕ
1
ϕ
V '
V
s
s
Max Angle Difference)
set ,
ϕ
2
ϕ
1
ϕ
V
5 SETPOINTS
equals two times
2
GE Multilin

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