{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "The device has at least one static frequency changer drive system (4) with first and second sub-devices (2,3) connected by a d.c. circuit (5) and the first sub-device connected to an a.c. source (1) via a transformer (8) and a supply network configuration switch (9) when the circuit is a.c. driven…",
  "path": "/patents/1082187",
  "publishedAt": "2004-11-24T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L9/30",
    "ABB SCHWEIZ AG [CH]"
  ],
  "textContent": "The device has at least one static frequency changer drive system (4) with first and second sub-devices (2,3) connected by a d.c. circuit (5) and the first sub-device connected to an a.c. source (1) via a transformer (8) and a supply network configuration switch (9) when the circuit is a.c. driven. A mains static frequency changer (11) is connected on the a.c. side to a third transformer winding (12) and on the d.c. side via the configuration switch to a d.c. source (13) when the circuit is d.c. driven.",
  "title": "Traction converter circuit for coupling to a electrical supply network"
}