Reactive power compensation by phase angle control and tap changer means

Claim 1

A REACTIVED POWER COMPENSATION SYSTEM FOR AN ELECTRICAL CONVERTER, COMPRISING: ELECTRICAL TRANSFORMER MEANS INCLUDING MAGNETIC CORE MEANS AND FIRST, SECOND, AND THIRD WINDING PORTIONS DISPOSED IN INDUCTIVE RELATION WITH SAID MAGNETIC CORE MEANS, SAID FIRST WINDING PORTION BEING ADAPTED FOR CONNECTION TO AN ALTERNATING CURRENT SYSTEM, SAID SECOND WINDING PORTION BEING ADAPTED FOR CONNECTION TO THE ELECTRICAL CONVERTER, SAID THIRD WINDING PORTION HAVING A PLURALITY OF TAP CONNECTIONS THEREON, CAPACITANCE MEANS, SAID CAPACITANCE MEANS BEING CONNECTED TO SAID THIRD WINDING PORTION TAP CHANGER MEANS, SAID TAP CHANGER MEANS BEING CONNECTED TO TAP CONNECTIONS ON SAID THIRD WINDING PORTION, PHASE ANGLE SENSOR MEANS, SAID PHASE ANGLE SENSOR MEANS BEING CONNECTED TO THE FIRST WINDING PORTION AND TO SAID TAP CHANGER MEANS, SAID PHASE ANGLE SENSOR MEANS PROVIDING A UNIDIRECTIONAL ERROR SIGNAL WHEN THE PHASE ANGLE BETWEEN THE VOLTAGE AND CURRENT OF SAID FIRST WINDING PORTION DEVIATES FROM A PREDETERMINED VALUE, WITH THE POLARRITY OF THE UNIDIRECTIONAL ERROR SIGNAL INDICATING THE DIRECTION OF THE DEVIATION, SAID TAP CHANGER MEANS BEING RESPONSIVE TO SAID ERROR SIGNAL, CHANGING TAP CONNECTION AND THE EFFECTIVE TURNS OF SAID THIRD WINDING PORTIONS TO PROVIDE A VOLTAGE ACROSS SAID CAPACITANCE MEANS WHICH WILL MAINTAIN THE PREDETERMINED PHASE ANGLE OF SAID FIRST WINDING PORTION AS THE LOAD ON SAID ELECTRICAL TRANSFORMER MEANS CHANGES.