摘要:

The method described is a single-phase application of the general principle discussed in an earlier paper. In one application it gives directly the relative phase-displacement between any two comparable alternating voltages as the angular position of a linear trace relative to a uniformly graduated circular scale attached to the face of a cathoderay tube. It is also possible to use a magslip, or an instrument of the ratiometer type, as an indicator in place of the cathode-ray tube.The circuit arrangements employed are founded on symmetrical-component theory, which serves both as a basis for design and also for estimating the effect of conditions which are different from those the method ideally demands. Practical tests on the instrument and its circuits, which are exceptionally simple, are discussed.

DOI:10.1049/pi-a.1955.0024

出版商:IEE    

年代:1955

数据来源: IET

摘要:

The device described, with test results, depends on symmetrical-component principles and consists of two neon tubes in a very simple preset bridge circuit. The phase rotation is shown by the lighting of one of the lamps, the other remaining unlit, and the instrument is superior in this respect, to the traditional Varley method, in which neither lamp is ordinarily completely extinguished. Wide variations of applied voltage are permissible, and a positive indication continues to be given for wider changes in frequency, and for systems which are more unbalanced, than will be encountered in ordinary industrial practice or could be used with orthodox induction-type indicators.The instrument, in effect, determines the relative phase-displacement of the two voltages applied to it and has been used in a more precise form as a phase-angle meter. Only two voltages of the supply system are therefore required, either line or phase values, and satisfactory performance is achieved in practice for polyphase systems for which the device was not specifically designed. The power consumption is small.

DOI:10.1049/pi-a.1955.0025

出版商:IEE    

年代:1955

数据来源: IET

DOI:10.1049/pi-a.1955.0030

出版商:IEE    

年代:1955

数据来源: IET