ABB RELION 670 Series Applications Manual page 107

1MRK 511 364-UUS A
tP 1
min
EQUATION1348 V1 EN-US
d
-
In min
EQUATION1349 V1 EN-US
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
than 10 ms, see equation 32.
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.
Application manual
=
30 ms
d
= ° × × +
360 f tP 1
si min Out
Z
S
=
d
max1
æ
×
-
2 tan in min
ç
è 2
RLdInFw
= =
max1
RLdOutFw 123.5
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, 21 or FRPSPDIS, 21) 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 (21) or FRPSPDIS (21) to follow the
condition presented in equation 33.
Index PHS designates correspondence to FDPSPDIS (21) or FRPSPDIS (21) function
and index PSD the correspondence to ZMRPSB (68) function.
= ° × × +
360 2.5 0.030 64.5
155.75
= =
75.8
ö æ ö
91.5
×
2 tan
÷ ç ÷
è 2 ø
ø
75.8
=
0.61
°
64.5
=
10.7 ms
°
° = °
91.5
W
tP2 time remains higher
Section 7
Impedance protection
(Equation 28)
(Equation 29)
(Equation 30)
(Equation 31)
(Equation 32)
RLdFwd in
101