Siemens SINAMICS G120P Manuel d'utilisation - Page 11

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Limiting the voltage rate of rise and voltage peaks using an output reactor and dv/dt filter

Fast-switching IGBTs in the converter result in high voltage gradients dv/dt at the converter

output. If long motor cables are used, this leads to an additional current load on the

converter due to capacitive charge/discharge currents. The high voltage gradients, and the

resulting transients at the motor terminals, cause the motors' electrical winding load to

increase as compared with direct on-line operation. In conjunction with the connected cable

capacitances, the output reactors with their adapted inductances reduce the capacitive

charge/discharge currents in the motor cables and, as a function of these motor cables, limit

the voltage gradient (dv/dt) and the transients Û

Figure 2-1

Output reactors

Operating Instructions, 05/2017, A5E32846921B AE

Limiting the voltage rate of rise and voltage peaks using an output reactor and dv/dt filter

at the motor terminals.

General