Siemens siprotec SJ62, Руководство пользователя

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4 Technical Data
461
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
4.3 Inverse Time Overcurrent Protection 51, 51N
Operating Modes
Setting Ranges / Increments
Trip Time Curves acc. to IEC
Three-phase Standard
Two-phase Phases A and C
Pickup current 51 (phases) for I
Nom
= 1 A 0.10 A to 4.00 A Increments
0.01 A
for I
Nom
= 5 A 0.50 A to 20.00 A
Pickup current 51N
for I
Nom
= 1 A 0.05 A to 4.00 A Increments
0.01 A
for I
Nom
= 5 A 0.25 A to 20.00 A
Time multipliers T for 51, 51N
IEC curves 0.05 s to 3.20 s or
∞
(disabled)
(disabled)
Increments
0.01 s
Time multipliers D for 51, 51N
ANSI curves 0.50 s to 15.00 s or
∞
(disabled)
Increments
0.01 s
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
p
≥
20 are identical with those for I / I
p
= 20.
For zero-sequence current read 3 I 0p instead of I
p
and T
3 I 0p
instead of T
p
;
for ground fault read
I
Ep
instead of
I
p
and T
I Ep
instead of T
p
Pickup Threshold approx. 1.10 ·
I
p