Setting Guidelines - ABB REL670 2.2 IEC Applications Manual

1MRK 506 369-UEN B
8.14.3
Line distance protection REL670 2.2 IEC
Application manual

Setting guidelines

Setting guidelines are prepared in the form of a setting example for the protected
power line as part of a two-machine system presented in figure 224.
E
A
d
= const
A
A
Z
SA
~
R
IEC99001019 V1 EN-US
Figure 224: Protected power line as part of a two-machine system
Reduce the power system with protected power line into an equivalent two-
machine system with positive sequence source impedances Z
protective relay R and Z
impedances cannot be directly calculated from the maximum three-phase short
circuit currents for faults on the corresponding busbar. It is necessary to consider
separate contributions of different connected circuits.
The required data is as follows:
=
U 400 kV
r
EQUATION1321 V1 EN-US
=
U 380 kV
min
EQUATION1322 V1 EN-US
=
f 50 Hz
r
EQUATION1323 V1 EN-US
400
=
U kV
p
3
EQUATION1324 V1 EN-US
0.11
=
U kV
s
3
EQUATION1325 V1 EN-US
=
I 1200 A
p
EQUATION1326 V1 EN-US
=
I 1 A
s
EQUATION1327 V1 EN-US
Table continues on next page
Z
L
behind the remote end bus B. Observe the fact that these
SB
Rated system voltage
Minimum expected system voltage under critical system
conditions
Rated system frequency
Rated primary voltage of voltage (or potential) transformers
used
Rated secondary voltage of voltage (or potential) transformers
used
Rated primary current of current transformers used
Rated secondary current of current transformers used
Section 8
Impedance protection
SEMOD52042-5 v5
B
Z
SB
~
99001019.vsd
behind the
SA
E
B
d
= f(t)
B
409