Line-Side Components; Line Fuses; Line Reactors - Siemens SINAMICS G130 Engineering Manual

SINAMICS G130
Engineering Information

4.8 Line-side components

4.8.1

Line fuses

The combined fuses (3NE1..., class gS) for line and semiconductor protection are recommended to protect the
converter. These fuses are specially adapted to provide protection for the input rectifier's semiconductors (thyristors).
Their properties are listed below:
·
Quick-acting
·
Adapted to the overload characteristic of the semiconductor (thyristor)
·
Low arc voltage
·
Effective current limiting.
4.8.2

Line reactors

A line reactor must be installed whenever
·
the converters are connected to a line supply system with high short-circuit power, i.e. with low line supply
inductance
·
more than one converter is connected to the same point of common coupling (PCC)
·
the converters are equipped with line filters for RFI suppression
·
the converters are equipped with Line Harmonics Filters (LHF) to reduce harmonic effects on the supply
system.
The line reactor smoothes the current drawn by the converter and thus reduces harmonic components in the line
current and thus the thermal load on the rectifier and DC link capacitors of the converter. The harmonic effects on the
supply are also reduced, i.e. both the harmonic currents and harmonic voltages in the power supply are attenuated.
Line reactors can be dispensed with only if the supply cable inductance is sufficiently high or the relative short-circuit
*)
power RSC correspondingly low.
The following values apply to SINAMICS G130 Chassis:
Converter output
SINAMICS G130
< 200 kW
200 kW - 500 kW
> 500 kW
As the configuration of the supply system for operating individual converters is often not known in practice, i.e. the
short-circuit power at the PCC of the converter is not certain, it is advisable to connect a line reactor on the line side
of the converter in cases of doubt.
*)
RSC = Relative Short-Circuit Power according to EN 60146-1-1:
Ratio between the short-circuit power S
S of the converter at its point of common coupling
Converter
SINAMICS Engineering Manual – November 2015
294/528
Ó Siemens AG
Line reactor can be
omitted with an RSC required with an RSC
of
≤ 43
≤ 33
≤ 20
of the supply system and the rated apparent power (fundamental apparent power)
K Line
Line reactor is
of
> 43
> 33
> 20