Siemens 3VA1 100 A, Руководство пользователя

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Applications
3.1 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers
122
Manual, 04/2015, A5E03603177010-02
Overload protection L:
• I
r
adjustable from 0.4 to 1.0 x I
n
in absolute current values
I
r
< 50 A: In steps of 0.5 A
I
r
≥ 50 A: In steps of 1 A
• t
r
adjustable from 0.5 to 12 / 15 / 17 / 20 / 25 s (depending on rated operational
current and breaker size)
with a reference point of 6 x I
r
.
In steps of 0.1 s
The ETU560 LSIG and ETU860 LSIG units have a thermal image which can be deactivated.
Short-time delayed short circuit protection S:
• I
sd
adjustable from 0.6 to 9 / 10 x I
n
I
sd
< 50 A: In steps of 0.5 A
I
sd
≥ 50 A: In steps of 1 A
•
t
sd
adjustable from 0.05 to 0.5 s
with a reference point of I
sd
= 8 x I
r
in steps of 0.01 s
The curve shape I
2
t = constant can be deactivated.
Instantaneous short-circuit protection I:
•
I
i
Breaker sizes 100 A to 400 A:
adjustable from 1.5 to 10 / 12 x I
n
Size 630 A:
see tables above
In steps of 1 A
Ground-fault protection G:
4-pole breakers or 3-pole breakers with external current transformer for N conductor detect
ground fault currents by calculating the vector sum of the phase currents and the neutral
conductor current.
•
I
g
adjustable from 0.2 / 0.25 / 0.4 / 0.6 to 1.0 x I
n
In steps of 1 A
• t
g
adjustable from 0.05 to 0.8 s
with a reference point of 2 x I
g
In steps of 0.01 s
An alarm threshold I
gA
between 0.2 to 1 x I
n
can also be set. In steps of 1 A
The current-dependent curve shape I
2
t = constant can be deactivated.
The ground-fault protection function G can be deactivated.