Inverse-Time Overcurrent Protection 51(N) - Siemens SIPROTEC 7SJ61 Manual
Multi-functional protective relay with bay controller
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Technical Data
4.3 Inverse-Time Overcurrent Protection 51(N)
4.3
Inverse-Time Overcurrent Protection 51(N)
Operating Modes
Three-phase
Two-phase
Measuring Technique
All elements
Setting Ranges / Increments
Pickup current 51 (phases)
Pickup current 51N (ground)
Time multiplier T for I
Time multiplier T for I
Trip Time Curves acc. to IEC
Acc. to IEC 60255-3 or BS 142, Section 3.5.2 (see also Figure 4-1 and 4-2)
The tripping times for I/I
For zero-sequence current read 3I0p instead of I
for ground fault read I
Pickup Threshold
320
Standard
Phases A and C
First harmonic, rms value (true rms)
for I
= 1 A 0.10 A to 4.00 A
Nom
for I
= 5 A 0.50 A to 20.00 A
Nom
for I
= 1 A 0.05 A to 4.00 A
Nom
for I
= 5 A 0.25 A to 20.00 A
Nom
, I
for IEC characteristics
p
Ep
for ANSI characteristics 0.50 s to 15.00 s or ∞ (disabled)
, I
p
Ep
≥ 20 are identical with those for I/I
p
instead of I
and T
instead of T
Ep
p
IEp
0.05 s to 3.20 s or ∞ (disabled)
= 20.
p
and T
instead of T
;
p
3I0p
p
p
approx. 1.10 · I
p
C53000-G1140-C210-1, Release date 02.2008
Increments 0.01 A
Increments 0.01 A
Increments 0.01 s
Increments 0.01 s
SIPROTEC, 7SJ61, Manual
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