{
  "$type": "site.standard.document",
  "description": "The present invention relates to an on-load tap changer control method for a power transformer (5) in a power system, where the power transformer has a primary side for a connection to a first grid in which electric power is generated (3), and a secondary side for connection to a second grid (9) in…",
  "path": "/patents/999780",
  "publishedAt": "2012-08-01T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G05F1/70",
    "ALSTOM TECHNOLOGY LTD [CH]"
  ],
  "textContent": "The present invention relates to an on-load tap changer control method for a power transformer (5) in a power system, where the power transformer has a primary side for a connection to a first grid in which electric power is generated (3), and a secondary side for connection to a second grid (9) in which electrical power is consumed, the power transformer (5) being equipped with an on-load tap changer (7), said method comprising the following steps: - measuring the voltage and current at least on the primary side ( u 1 , i 1 ) or on the secondary side (u 2 i 2 ) of the power transformer, - processing said measured voltages (u 1 ; u 2 ) and currents (i 1 ; i 2 ) in order to derive prospective reactive power at the output of the power transformer (5) after prospective tap-change, - compare prospective reactive power to a predefined set-point, - initiate tap-change of on-load tap changer (7) if prospective reactive power is closer to said predefined set-point than actual reactive power.",
  "title": "On-load tap changer control method, excitation control system carrying out said control method and power excitation chain"
}