Directional Time Overcurrent Protection (67 And 67N Elements) - Siemens SIPROTEC 7SJ62 Instruction Manual

Technical Data
10.4

Directional Time Overcurrent Protection (67 and 67N Elements)

Overcurrent Ele-
ments
Determining Direc-
tion
For Phase Faults
For Ground Faults
Directional Sensitivity
Inherent Operating Pickup times without intentional delay or inrush stabilization. With inrush stabilization,
Times add 10 ms.
67-1, 67-2, 67N-1, 67N-2
– Current = [2 x pickup]
– Current = [10 x pickkup]
Dropout Times
67-1, 67-2, 67N-1, 67N-2
Tolerances Phase angle errors under reference conditions
– For phase faults and for ground faults ± 3° electrical
Influencing Vari- Frequency Influence
ables
– With no memory voltage
10-18
The same specifications and characteristics apply as for non-directional time overcur-
rent protection (see Sub-sections 10.2 and 10.3).
Moreover, the following data apply for determining fault direction:
Polarization
Forward Range
Inductive
Resistive
Capacitive
Directional Sensitivity
Polarization
Forward Range
Inductive
Resistive
Capacitive
With short-circuit free voltages, with
voltage memory (memory duration is 2
cycles) for measurement voltages that are
too low.
Can be set in 3 stages (3 protection areas):
45° ± 86°
0° ± 86°
–45° ± 86°
(if short-circuit free voltage vertical to
short circuit voltage)
Unlimited for one and two phase faults.
For three phase faults, dynamically unlimit-
ed, steady-state approx. 7V phase-to-phase.
With zero sequence quantities
Can be set in 3 stages (3 protection areas)
45° ± 84°
0° ± 84°
–45° ± 84°
approx. 5 V displacement voltage, mea-
sured
approx. 12 V displacement voltage, cal-
culated
approx. 45 ms
approx. 40 ms
approx. 40 ms
approx. 1° in range 0.95 < f/f
C53000-G1140-C121-1
< 1.05
N
7SJ62 Manual