ABB REL670 2.2 IEC, Applications Manual

Page: 420 / 908

min
1 30 tP ms
=
EQUATION1348 V1 EN-US
(Equation 413)
min min
360 1 360 2.5 0.030 64.5 91.5
In si Out
f tP
d d
-
= °× × + = °× × + ° = °
EQUATION1349 V1 EN-US
(Equation 414)
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-US
(Equation 415)
max1
75.8
0.61
123.5
= = =
RLdInFw
kLdRFw
RLdOutFw
EQUATION1351 V1 EN-US
(Equation 416)
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 417 .
max
91.5 64.5
2 10.7
360 7 360
In Out
sc
tP ms
f
d d
- ° - °
= = =
× ° × °
EQUATION1352 V1 EN-US
(Equation 417)
The final proposed settings are as follows:
RLdOutFw = 123.5Ω
kLdRFw = 0.61
tP1 = 30 ms
tP2 = 10 ms
Consider RLdInFw = 75.0Ω.
Do not forget to adjust the setting of load encroachment resistance
RLdFw in 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
418 .
Section 8
1MRK 506 369-UEN B
Impedance protection
414 Line distance protection REL670 2.2 IEC
Application manual