| 摘要 |
The invention relates to a device for compensation of reactive (inductive) power in a.c. circuits. The inductive power, which is caused by autoinduction = an inertia when the electrons are accelerated, is a problem which limits the useful power that can be transmitted in a.c. networks. Normally the problem is solved by compensation with capacitors or idling rotating machines. The invention solves the problem by connecting a transformer to the primary circuit. The secondary winding of the transformer is fed with a d.c. voltage during the first half of every half cycle of the primary current. A resonance circuit controls the rise of the d.c. current which induces a magnetic energy in the primary circuit which compensates the autoinductance. The device is regulated automatically and infinitely variably by a regulator which is connected to a power factor (cos fi) meter. The interruption of the secondary circuit can be made by a mechanical breaker, by thyristors or by a static frequency converter. In an alternative design the secondary circuit consists of an extra winding in a normal power transformer. |
