Siemens SIPROTEC 7SJ62 User Manual

Technical Data
4.4 Directional Time Overcurrent Protection 67, 67N
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
492
4.4 Directional Time Overcurrent Protection 67, 67N
Time Overcurrent Elements
Determination of Direction
For Phase Faults
For Ground Faults
Times
The same specifications and characteristics apply as for non-directional time overcurrent protection
(see previous Sections).
Moreover, the following data apply to direction determination:
Polarization With cross-polarized voltages;
with voltage memory 2 s
Forward Range V
ref,rot
± 86°
Rotation of the reference voltage V
ref,rot
–180° to +180°
Increments 1°
Dropout difference 2°
Directional sensitivity Unlimited for single and two phase faults
For three phase faults, dynamically unlimited, steady-state
approx. 7V phase-to-phase.
Polarization with zero sequence quantities 3V
0
, 3I
0
Forward Range V
ref,rot
± 86°
Rotation of the reference voltage V
ref,rot
–180° to +180°
Increments 1°
Dropout difference 2°
Directional Sensitivity V
N
≈ 2.5 V displacement voltage, measured
3V
0
≈ 5 V displacement voltage, calculated
Polarization with negative sequence quantities 3V
2
, 3I
2
Forward Range V
ref,rot
± 86°
Rotation of the reference voltage V
ref,rot
–180° to +180°
Increments 1°
Dropout difference 2°
Directional Sensitivity 3V
2
≈ 5 V negative sequence voltage
3I
2
≈ 45 mA negative sequence current with I
Nom
= 1 A
3I
2
≈ 225 mA negative sequence current with I
Nom
= 5 A
Pickup times (without inrush restraint, with restraint add 10 ms)
50-1, 50-2, 50N-1, 50N-2
- for 2 x setting value
- for 10 x setting value
approx. 45 ms
approx. 40 ms
Dropout Times
50-1, 50-2, 50N-1, 50N-2 approx. 40 ms
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Siemens SIPROTEC 7SJ62 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SJ62
Category	Relays
Language	English