0
3
I
IMinPUPG
<
EQUATION2109-ANSI V1 EN
(Equation 31)
0
max
100
3
INBlockPP
Iph
I
<
×
EQUATION2110-ANSI V1 EN
(Equation 32)
where:
IMinPUPG is the minimum operation current for ground measuring loops,
3I0BLK_PP is 3I
0
limit for blocking phase-to-phase measuring loop and
Iphmax
is maximal magnitude of the phase currents.
6.2.6.3
Three-phase faults
The operation conditions for three-phase faults are the same as for phase-to-phase fault,
that is equation
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
1MRK 506 335-UUS A
Section 6
Impedance protection
135
Technical manual
Содержание REL650 series
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