Siemens SINAMICS G130 Engineering Manual page 63

The table below shows the circuit breakers used in the different SINAMICS cabinet units depending on the line
supply voltage as well as the associated short-circuit breaking capacity for TN systems and IT systems without
ground fault. (Short-circuit breaking capacity for IT systems with ground fault on request).
SINAMICS cabinet unit
G150
1)
Single units > 800 A
and
2)
parallel units ≥ 1500 A
S150
2)
Single units > 800 A
S120 Cabinet Modules
Line Connection Modules
2)
with currents > 800 A
1)
Circuit breaker can be ordered as option L26
SINAMICS cabinet units:
Circuit breakers used and associated short-circuit breaking capacity for TN systems and IT systems without ground fault
Information about commissioning / Setting of rotary coding switches on electronic trip units (ETU)
The SENTRON 3WL circuit breakers installed in SINAMICS cabinet units are equipped with electronic trip units of
type ETU15B or ETU25B (depending on the unit type). These electronic trip units have a number of rotary coding
switches that need to be set correctly in order to ensure optimum protection of the SINAMICS cabinet unit.
Note:
The current setting values on the rotary coding switches (I
current I of the circuit breaker. For this reason, the converter input currents (converter rated input current I
n
60-second overload current and 5-second overload current) must always be referred to the rated current I
circuit breaker.
Overload protection L (Long Time Delay)
The overload protection L can be set on electronic trip units ETU15B and ETU25B. The overload protection setting
should be at least equal to or slightly higher than the referred rated input current of the SINAMICS converter or the
SINAMICS infeed. It is then ensured that the converter can fully utilize its permissible continuous current and its
permissible overload reserves. Based on this requirement, the following values have to be set (depending on the unit
type and the associated ratio between the rated input current I
I of the circuit breaker):
n
The values applicable to the specific unit types are specified in the relevant operating instructions.
Short-time delayed short-circuit protection (Short Time Delay)
The short-time delayed short-circuit protection S can be set on electronic trip units ETU25B. The values should be set
as low as possible and as fast as possible to ensure the fastest possible response of the circuit breaker to a short
circuit to minimize damage to the unit. Since the permissible range of operating currents for SINAMICS converters is
limited to a maximum of approximately 1.45 times the rated input current, the relative short-time delayed short-circuit
current should equal approximately 2 times the referred rated input current of the converter or infeed. The associated
delay time should be set to the lowest possible value. Based on this requirement, the setting values are thus as
follows:
These values are also specified in the relevant operating instructions.
Fundamental Principles and System Description
Line supply Circuit breaker
voltage (type, size,
switching class)
380 – 480 V 3AC 3WL11 / I / N
500 – 600 V 3AC 3WL12 / II / H
660 – 690 V 3AC 3WL12 / II / H
380 – 480 V 3AC 3WL11 / I / N
500 – 690 V 3AC 3WL12 / II / H
380 – 480 V 3AC 3WL12 / II / H
500 – 690 V 3AC 3WL12 / II / H
2)
Circuit breaker is included as standard
I = 0.7.....1.0 (unit-specific).
R
I
sd
t
sd
Engineering Information
Short-circuit
breaking capacity
, I , I ) are relative values that are referred to the rated
R sd i
of the converter or the infeed and the rated current
N In
= 2,
= 0.
SINAMICS Engineering Manual – November 2015
55 kA
85 kA
85 kA
55 kA
85 kA
100 kA
85 kA
n
63/528
Ó Siemens AG
,
N In
of the