Siemens SIPROTEC 7SJ62 - Page 514

Technical Data
4.16 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
514
Influencing Variables
Direction Determination for all Types of Ground Fault with cos ϕ / sin ϕ Measurement
Direction Determination for all Types of Ground Fault with V0 ϕ / I0 ϕ Measurement
Power Supply DC Voltage in Range
0.8 ≤ V
PS
/V
PSNom
≤ 1.15
1%
Temperature in Range 23.00 °F (–5 °C) ≤ Θ
amb
≤ 131.00 °F (55 °C) 0.5 %/10 K
Frequency in range f
Nom
± 5 Hz 1 %
Harmonics
- Up to 10 % 3rd harmonic
- Up to 10 % 5th harmonic
1%
1%
Note: When using the sensitive transformer, the linear range of the measuring input for the sensitive ground
fault detection is from 0.001 A to 1.6 A. The function is however still preserved for greater currents.
Direction determination - I
N
and V
N
measured
- 3I
0
and 3V
0
calculated
Measuring principle Real/reactive power measurement
Measuring release RELEASE DIRECT.
(current component perpendicular to directional limit line)
for sensitive transformer
for normal 1-A transformer
for normal 5-A transformer
0.001 A to 1.200 A
0.05 A to 30.00 A
0.25 A to 150.00 A
Increment 0.001 A
Increment 0.01 A
Increment 0.05 A
Dropout ratio approx. 0.80
Measuring method cos ϕ and sin ϕ
Directional limit line PHI CORRECTION -45.0° to +45.0° Increments 0.1°
Dropout delay RESET DELAY 1 s to 60 s Increments 1 s
Direction determination - I
N
and V
N
measured
- 3I
0
and 3V
0
calculated
Measuring principle V0 / I0 phase angle measurement
50Ns-1 element
Minimum voltage 50Ns-1 Vmin
V0 measured 7SJ64
V0 measured 7SJ62
3V0 calculated
0.4 V to 50 V
1.8 V to 50 V
10 V to 90 V
Increment 0.1 V
Increment 0.1 V
Increment 1 V
Phase angle 50Ns-1 Phi - 180° to 180° Increments 1°
Delta phase angle 50Ns-1 DeltaPhi 0° to 180° Increments 1°
50Ns-2 element
Minimum voltage 50Ns-2 Vmin
V0 measured 7SJ64
V0 measured 7SJ62
3V0 calculated
0.4 V to 50 V
1.8 V to 50 V
10 V to 90 V
Increment 0.1 V
Increment 0.1 V
Increment 1 V
Phase angle 50Ns-2 Phi - 180° to 180° Increments 1°
Delta phase angle 50Ns-2 DeltaPhi 0° to 180° Increments 1°
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