. Journal of electricity, power, and gas . : z Fig, 36. in conjunction with current and potential trans-formers is shown in Fig. 36; the relations of the cur-rents and voltages being- shown in the vector Fig. 37. Fig. 37. Let I, r and I represent the currents in thethree legs of a three phase system; E being the volt-age between lines and e the voltage between any lineand neutral. Also let 8, 8, and 8 represent the anglesIjy which the currents are displaced from the positionof unity power factor; we will assume the voltage tobe balanced, since this makes the explanation some-w
. Journal of electricity, power, and gas . : z Fig, 36. in conjunction with current and potential trans-formers is shown in Fig. 36; the relations of the cur-rents and voltages being- shown in the vector Fig. 37. Fig. 37. Let I, r and I represent the currents in thethree legs of a three phase system; E being the volt-age between lines and e the voltage between any lineand neutral. Also let 8, 8, and 8 represent the anglesIjy which the currents are displaced from the positionof unity power factor; we will assume the voltage tobe balanced, since this makes the explanation some-what simpler. The true power is P ^ e I cos ^ -|- e Icos 8 -\- e I cos 8. Meter No. i has currents I and Iflowing through its winding (that is, the resultant ofthese currents), and the voltage, E, CA, impressedupon it: it is used with a multiplier of 1/2. Meter No. 2 has the current I flowing through it,and the voltage Bn, impressed upon it; Bn = (3/2) P represent the total power, P the power regis-tered by meter No. i and P the power registered bymeter No. 2, P -- EL cos (30° — 6) -f EI cos (30° + 8).P=^e I cos 6. PP =-- f-+ P 258 JOURNAL OF ELECTRICITY, POWER AND GAS [Vol. XXIV—No. 12 EIcos (30- and
Size: 1670px × 1496px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
