302
FUNCTION CHARACTERISTICS
For this specific application the results are:
The ꞵ angle is parameterized as system impedance argument, for this specific application the re-
sult is:
δ
AL
, δ
TRIP
, N
A
, N
B
and t
RESET_78
parameters are parameterized without further conversion steps. Figure
(H) shows electrical system impedances related to current specific example on R-X plane.
Figure (I) shows the impedances on the R-X plane according to the approximate 78 protection mo-
del with Z
A
,Z
B
,Z
C
and ꞵ parameters.
Still in Figure (I) trajectory of out of step event in generator/transformer area is shown, where 78
protection status (rest/alarm1/alarm2/trip) is highlighted.
XMR-D EQUIPMENT MANUAL
Ed. 2.9 - 02/2021
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