Dv/Dt Filters Plus Vpl And Dv/Dt Filters Compact Plus Vpl; Design And Operating Principle - Siemens SINAMICS G130 Engineering Manual

1.10.2

dv/dt filters plus VPL and dv/dt filters compact plus VPL

1.10.2.1 Design and operating principle

The dv/dt filters plus VPL and dv/dt filters compact plus VPL consist of two components, i.e. a dv/dt reactor and a
voltage limiting network (Voltage Peak Limiter).
The dv/dt reactor achieves the same effect as the motor reactor. In combination with the capacitance of the
connected motor cable and the internal capacitance of the limiting network, it forms an oscillating circuit which limits
the voltage rate-of-rise dv/dt to the following values irrespective of the length of the connected motor cable:
·
dv/dt < 500 V/ms with dv/dt filters plus VPL
·
dv/dt < 1600 V/ms with dv/dt filters compact plus VPL
The limiting network basically comprises a diode bridge and connects the output of the dv/dt reactor to the inverter
DC link. By this arrangement, the voltage overshoots at the dv/dt reactor output are limited to approximately the level
of the DC link voltage, and the peak voltage Û
voltage gradient, the voltage conditions at the output of the dv/dt filter and the motor terminals are practically
identical.
a) without dv/dt filter
Voltage characteristic v(t) at the inverter output and at the motor terminals
dv/dt filters plus VPL and dv/dt filters compact plus VPL are very effectively limiting both the voltage rate-of-rise dv/dt
and the peak voltage V on the motor winding to the values given below.
PP
·
dv/dt filter plus VPL:
·
Voltage rate-of-rise dv/dt < 500 V/ms
·
Peak voltage V
·
Peak voltage V
·
dv/dt filter compact plus VPL:
·
Voltage rate-of-rise dv/dt < 1600 V/ms
·
Peak voltage V
·
Peak voltage V
The dv/dt filter plus VPL is capable of limiting the peak voltage to values below the limit curve stipulated in
IEC/TS 60034-17:2006 (V
values below the limit curve A stipulated in IEC/TS 60034-25:2007 (V
Fundamental Principles and System Description
on the motor cable is thus restricted accordingly. Due to the reduced
LL
(typically) < 1000 V
PP
(typically) < 1250 V
PP
(typically) < 1150 V
PP
(typically) < 1400 V
PP
< 1350 V), and the dv/dt filter compact plus VPL is capable of limiting the peak voltage to
PP
Engineering Information
b) with dv/dt filter plus VPL or dv/dt filter compact plus VPL
for V < 575 V
Line
for 660 V < V < 690 V
Line
for V < 575 V
Line
for 660 V < V < 690 V
Line
< 1560 V).
PP
SINAMICS Engineering Manual – November 2015
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