Harmonic Currents - Siemens SINAMICS G120 Hardware Installation Manual

Technical data
7.8 Electromagnetic compatibility of variable-speed drives
● Inverters with an LO base load input current > 16 A and ≤ 75 A
The drive system is in compliance with IEC/EN 61000-3-12 under the following
precondition:
– Power Module FSD, input voltage 380 ... 480 V 3 AC: A line reactor is not required
– The short-circuit power S
If these preconditions do not apply, then the installation company or company operating
the device must obtain authorization from the grid operator to connect the device regarding
the harmonic currents.
● Inverters with an LO base load current > 75A
There are no standard-related requirements for installing devices such as these. However,
it is recommended to inform the grid operator when connecting such a device.
7.8.2

Harmonic currents

Table 7-13
Inverter
FSD ... FSF, 400 V
FSD ... FSF, 690 V
Values referred to the LO input current
1)
80
grid is greater or is equal to the value according to the following formula:
SSC ≥ 120 ∙ √3∙ Uin ∙ LO base load input current
Example: FSD inverter, 400 V, input current, 70 A:
S ≥ 120 ∙ √3 ∙ 400 V ∙ 70 A
SC
This corresponds to a low-voltage transformer with an apparent power rating of
approximately 300 kVA ... 400 kVA
The installation company or company operating the equipment is responsible for
ensuring that this equipment is only connected at a connection point with an appropriate
short-circuit power (fault level).
Harmonic currents (Page 80)
Typical harmonic currents (%) of the inverter
1)
1)
at the connection point of the customer's system to the public
SC
5th 7th 11th
37 21 7
34 18 8
Hardware Installation Manual, 11/2016, A5E37800827C AB
Harmonic number
13th 17th 19th
5 4 3
5 4 3
PM240P-2 Power Modules
23rd 25th
3 2
3 2