| 摘要 |
<p>1488442 Interconnected three phase systems OTDEL ENERGETICH KIBERNETI AKAD NAUK MOLDAVSK SSR 20 March 1975 [21 March 1974] 11562/75 Heading H2H A power transmission system comprises a link which interconnects two three phase systems, the conductors of the link being arranged in three pairs, means being provided whereby the voltages applied to the conductors of each pair of lines may be shifted in phase relative to one another. Two three phase systems 1 are interconnected by a link which includes conductors 2, 3, the conductors of the link being arranged in three pairs, each pair having a conductor 2 and a conductor 3. The conductors 2 are connected to the systems 1 by voltage phase shifting devices 4 and switches 7 whilst the conductors 3 are connected by similar devices 4 and switches 8. Furthermore the conductors 2, 3 of each pair have capacitors 5 connected thereacross whilst inductors 6 are connected to conductors 2, 3 of different pairs. The voltage phase shifting devices 4-which may be a type of transformer-allow adjustment to be made of the angles # between the voltages applied to the conductors 2, 3 of each pair in the interconnecting link whereby the power transmitted along the link may be controlled, the adjustment of the angles # between the conductors 2, 3 of each of the pairs being equal. The provision of the capacitors 5 serves to increase the power transmitted whilst the provision of the inductors 6 serves to decrease the power transmitted, both as a function of the angle #. The variation of the angle # may be made in one discrete step by an extra set of switches where the conductors 3 may be connected in phase or anti-phase to the conductors 2. The system may also function as a fault protection system by opening the relevant set of switches 7 or 8 so that one set of conductors 2 or 3 is open-ended to serve as a balancing resistor. Alternatively systems of spark-gaps, switches and variable resistors may be connected to the conductors 2, 3 between the switches 7, 8 and the devices 4 so that the variable resistors are connected to the conductors when these conductors become disconnected, the resistors being adjustable according to the loading on the transmission link.</p> |
