ABB RELION 670 Series Applications Manual page 357

1MRK 504 152-UEN B
RLdInFw
EQUATION1350 V1 EN-US
kLdRFw
EQUATION1351 V1 EN-US
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
higher than 10 ms, see equation 397.
tP 2
max
EQUATION1352 V1 EN-US
The final proposed settings are as follows:
RLdOutFw = 123.5Ω
kLdRFw = 0.61
tP1 = 30 ms
tP2 = 10 ms
Consider RLdInFw = 75.0Ω.
ArgLd
EQUATION1353 V2 EN-US
Consider equation 399,
ArgLd
EQUATION1354 V1 EN-US
Application manual
Z
S
=
d
max1
æ
×
-
2 tan in min
ç
2
è
RLdInFw
= =
max1
RLdOutFw
d d
-
° -
91.5
= =
In Out
× ° ×
f 360 7 360
sc
Do not forget to adjust the setting of load encroachment resistance
Phase selection with load encroachment (FDPSPDIS or FRPSPDIS) to the value
equal to or less than the calculated value RLdInFw. It is at the same time
necessary to adjust the load angle in FDPSPDIS or FRPSPDIS to follow the
condition presented in equation 398.
Index PHS designates correspondence to FDPSPDIS or FRPSPDIS function and
index PSD the correspondence to ZMRPSB function.
(
tan ArgLd
³
arc tan
PHS
kLdRFw
j
= = °
25
PSD max
155.75
= =
75.8
ö æ ö
91.5
×
2 tan
ç ÷
÷
è 2 ø
ø
75.8
=
0.61
123.5
°
64.5
=
10.7 ms
°
)
PSD
Impedance protection
W
tP2 time remains
Section 7
(Equation 395)
(Equation 396)
(Equation 397)
RLdFw in
(Equation 398)
(Equation 399)
351