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1. (WO2017036882) METHOD FOR OPERATING AN INVERTER AND INVERTER

Pub. No.:    WO/2017/036882    International Application No.:    PCT/EP2016/069992
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Aug 25 01:59:59 CEST 2016
IPC: H02M 7/487
G01R 29/16
G01R 31/42
G01R 31/02
H02M 1/32
H02M 1/36
G01R 19/165
Applicants: SMA SOLAR TECHNOLOGY AG
Inventors: CORREA VASQUEZ, Pablo Ignacio
KNOBLOCH, Andreas
Title: METHOD FOR OPERATING AN INVERTER AND INVERTER
Abstract:
A method for operating an inverter (1) is described, wherein the inverter (1) has a terminal (2) with four conductor terminals (3-6) for the connection of the inverter (1) to three external conductors (L1, L2, L3) and a neutral conductor (N) of an AC voltage supply system (7). Switching elements of a bridge circuit (8) of the inverter (1) are activated in the course of a testing step for creating a zero phase-sequence system, wherein output currents (IL1 ,IL2 ,IL3 ,IN) of the inverter (1) are measured and evaluated with respect to a zero phase-sequence current. The presence of a connection of the neutral conductor (N) to a conductor terminal (6) provided for the connection to the neutral conductor (N) is detected if a zero phase-sequence current that exceeds a predetermined threshold value is detected in the course of the testing step. Otherwise, it is detected that the neutral conductor (N) is not connected to the conductor terminal (6) provided for the connection to the neutral conductor (N). An inverter (1) designed for carrying out the method is likewise described.