The blinder in forward direction,
Resistive reach Fw
, can be calculated according to
2
expmin
expmax
U
P
Resistive reach Fw K= ×
(Equation 313)
where:
P
expmax
is the maximum exporting active power
U
expmin
is minimum phase-to-phase voltage when the exporting active power occurs
K
is a security factor to ensure that the setting of
Resistive reach Fw
less than
minimal resistive load, with a recommended value 0.8.
The resistive boundary
Resistive reach Rv
can be obtained in the same way as
Resistive reach Fw
, but replace the maximum exporting active power P
expmax
and
the corresponding voltage U
expmin
with the maximum importing active power
P
impmax
and the corresponding voltage U
impmin
.
The
Max impedance angle
and
Min impedance angle
are symmetric in forward and
reverse direction, these values are recommended to set the maximum possible load
angle when load active power arrives at top. A value bigger than 20° must be used.
Protection related functions
1MRS759142 F
1298 REX640
Technical Manual
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