Electrical power distribution installation for electrical power system

摘要

An apparatus and method applicable to an electric power distribution installation, the electrical power distribution installation comprising: at least one main common bus bar (BUS-A or BUS-B); a plurality of main transformers (T11,T21), each main transformer being configured to step down a received power supply voltage and to supply the stepped down power supply voltage to a load via the main common bus bar; and a plurality of power generators (G1-G4), each power generator being connected to the main common bus bar, and the apparatus comprising: a first grounding device including at least one grounding transformer (ET1 or ET2) connected to the main common bus bar, a neutral point of the grounding transformer being grounded in a form of a predetermined low impedance grounding; and a second grounding device (NT1-NT4) connected to each neutral point of the power generators to always ground each neutral point directly in a form of a predetermined high resistance grounding.