ABB Relion 650 Series Technical Manual page 97

1MRK 506 326-UUS B
INBlockPP
<
3 I
0
100
EQUATION2110-ANSI V1 EN-US
where:
IMinPUPG
3I0BLK_PP is 3I
Iphmax
5.2.6.3 Three-phase faults
The operation conditions for three-phase faults are the same as for phase-to-phase fault, that is
equation , equation and equation are used to release the operation of the function.
However, the reach is expanded by a factor 2/√3 (approximately 1.1547) in all directions. At the
same time the characteristic is rotated 30 degrees, counter-clockwise. The characteristic is shown
in figure 44.
K3 = 2 / v(3)
ANSI05000671 V2 EN-US
Figure 44: The characteristic of FDPSPDIS (21) for three-phase fault (setting parameters in
Line distance protection REL650
Technical manual
×
Iph max
is the minimum operation current for ground measuring loops,
limit for blocking phase-to-phase measuring loop and
0
is maximal magnitude of the phase currents.
X (O/phase)
×
4 X1
3
0.5·RFltFwdPP·K3
X1·K3
0.5·RFltRevPP·K3
italic)
© Copyright 2011 ABB Power Grids. All rights reserved
90 deg
×
4 RFltFwdPP
6
R (O/phase)
30 deg
ANSI05000671-2-en.vsd
Section 5
Impedance protection
(Equation 10)
M13140-80 v3
91