Journal of electricity, power, and gas . Fig. 4. Shunt Operated Meter With Four Pole Field. Fig-. 5. Mercury Type Meter. Up to the present time the shunted meter if prop-erly designed and installed is probably the best andleast expensive meter for metering large amounts power; but not so much from the standpoint ofinitial accuracy as from that of easily maintaining afair accuracy. The trend of further development in direct cur-rent metering lies therefore in the development of apiece of apparatus which is the counterpart of the transformer. An automatic ratio relay recently
Journal of electricity, power, and gas . Fig. 4. Shunt Operated Meter With Four Pole Field. Fig-. 5. Mercury Type Meter. Up to the present time the shunted meter if prop-erly designed and installed is probably the best andleast expensive meter for metering large amounts power; but not so much from the standpoint ofinitial accuracy as from that of easily maintaining afair accuracy. The trend of further development in direct cur-rent metering lies therefore in the development of apiece of apparatus which is the counterpart of the transformer. An automatic ratio relay recently patented by thewriter adapts itself admirably to the above mentionedpurpose; it may be in some respects called a cur-rent transformer, for practically and theoretically, itperforms the function of the well-known currenttransformer. It may interest some of the readers toknow the theory of its construction. It is well known that in the current or seriestransformers the primary series or line current pro-duces a flux in the
Size: 1696px × 1473px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1800, bookdecade1890, booksubjectelectricity
