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1. (WO2017148794) GROUND CIRCUIT IN AN AC NETWORK

Pub. No.:    WO/2017/148794    International Application No.:    PCT/EP2017/054196
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Fri Feb 24 00:59:59 CET 2017
IPC: H02J 3/36
H02M 7/483
Applicants: GENERAL ELECTRIC TECHNOLOGY GMBH
Inventors: GUPTA, Robin
WHITEHOUSE, Robert
Title: GROUND CIRCUIT IN AN AC NETWORK
Abstract:
An electrical assembly (10) comprises a power converter (12) that includes first and second DC terminals (14, 16) which are connectable to a DC electrical network (17). The power converter (12) also includes a plurality of converter limbs (18) that are connected between the first and second DC terminals (14, 16). Each converter limb (18) includes an AC terminal (20) that is connectable to a respective AC phase (22a, 22b, 22c) of a multi-phase AC electrical network (23). Each converter limb (18) also includes first and second limb portions (24a, 24b). Each limb portion (24a, 24b) is connected between a corresponding AC terminal (20) and a respective one of the first and second DC terminals (14, 16). Each limb portion (24a, 24b) includes at least one switching element (25). The electrical assembly (10) includes a single grounding circuit (28) that includes a reactor (32) that is configured to provide a current path for alternating current with a high impedance to ground (30) and a current path for direct current with a low impedance to ground (30). The grounding circuit (28) is arranged so that only one of the AC phases (22a) is connected to ground (30) via the grounding circuit (28).