76.5 64.5
1 13.3
360 2.5 360
In Out
si
tP ms
f
d d
-
° - °
= = =
× ° × °
EQUATION1347 V1 EN (Equation 303)
The general tendency should be to set the tP1 time to at least 30 ms, if possible. Since
it is not possible to further increase the external load angle δ
Out
, it is necessary to
reduce the inner boundary of the oscillation detection characteristic. The minimum
required value is calculated according to the procedure listed in equation
304, 305, 306
and 307.
EQUATION1348 V1 EN (Equation 304)
min min
360 1 360 2.5 0.030 64.5 91.5
In si Out
f tP
d d
-
= °× × + = °× × + ° = °
EQUATION1349 V1 EN (Equation 305)
max1
min
155.75
75.8
91.5
2 tan
2 tan
2
2
d
-
= = = W
æ ö æ ö
×
×
ç ÷
ç ÷
è ø
è ø
S
in
Z
RLdInFw
EQUATION1350 V1 EN (Equation 306)
max1
75.8
0.61
123.5
= = =
RLdInFw
kLdRFw
RLdOutFw
EQUATION1351 V1 EN (Equation 307)
Also check if this minimum setting satisfies the required speed for detection of
consecutive oscillations. This requirement will be satisfied if the proposed setting of
tP2 time remains higher than 10 ms, see equation
308.
max
91.5 64.5
2 10.7
360 7 360
In Out
sc
tP ms
f
d d
-
° - °
= = =
× ° × °
EQUATION1352 V1 EN
(Equation 308)
The final proposed settings are as follows:
RLdOutFw = 123.5Ω
kLdRFw = 0.61
tP1 = 30 ms
1MRK504116-UUS C Section 3
IED application
363
Application manual
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