IG-150-EN version 04; 03/10/16
71
General instructions
ekor.rps
Protection functions. Description and settings
As the neutral units allow the trips with forward and reverse
faults the characteristics will have the following form:
1
Backwards
2
Forwards
Figure 4.12. Trip with forward and reverse faults
I*sen(φ) directional
In order to allow the pick up of the directional unit, the
following must be fullled:
1. Exceed the Vr minimum threshold.
2. The minimum current I
mínima
=I
r
cos(j-j
c
) must exceed
the minimum threshold set in absolute value. If the
sign is negative, the fault is forward. If it is positive, it
is reverse.
3. For forwards faults, the angle between the current and
the voltage, displaced the maximum torque angle, and
must be between 187 and 353.
187<ang(I
0
)–angle(V
0
)+characteristic angle<353
4. For backwards faults, the angle between the current
and the voltage, displaced the maximum torque angle,
and must be between 7 and 173.
7<ang(I
0
)–angle(V
0
)+characteristic angle<173
(
v – i – φ
)
=
Im(V) ⋅ cos(φ) + Re(V) ⋅ sin(φ)
⋅ Re(I) +
Re(V) ⋅ cos(φ) – Im(V) ⋅ sin(φ)
⋅ Im(I)
1
Tripping zone
2
Locking zone
Figure 4.13. I*sen(φ) directional
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