ABB Relion 670 Series Applications Manual page 111

1MRK 511 407-UUS Rev. J
IEC19000322 V1 EN-US
Figure 48: ACT configuration to unblock zone 1 and block other distance protection zones in
7.1.4 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 49.
E
d
= const
A
~
ANSI99001019 V1 EN-US
Figure 49: 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
end bus B. Observe the fact that these 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:
Phasor measurement unit RES670
Application manual
ZMFPDIS using ZMBURPSB
A
A
Z
SA
R
© Copyright 2017 Hitachi Power Grids. All rights reserved
B
Z Z
L
behind the protective relay R and Z
SA
Impedance protection
GUID-D85038D3-1911-44FB-8150-BA173295E096 v1
E
B
d
= f(t)
B
SB
~
99001019_ansi.vsd
behind the remote
SB
Section 7
105