. Determination of the ratio of transformation and of the phase relations in transformers . The connections are shown in Fig. 3. With switches A and Bthrown down and switch C thrown up, the deflection is B is then thrown up and the resistance R2 adjusted to givethe same deflection as before. This makes the two fields of equaldeflecting strength. Switch A is then thrown up, connecting thecondenser in series with the moving coils, and the deflections D^and D2 are read for the two positions of switch B. Each deflection. -18O-0- Fig. 4. is a measure of the phase-angle between the cond
. Determination of the ratio of transformation and of the phase relations in transformers . The connections are shown in Fig. 3. With switches A and Bthrown down and switch C thrown up, the deflection is B is then thrown up and the resistance R2 adjusted to givethe same deflection as before. This makes the two fields of equaldeflecting strength. Switch A is then thrown up, connecting thecondenser in series with the moving coils, and the deflections D^and D2 are read for the two positions of switch B. Each deflection. -18O-0- Fig. 4. is a measure of the phase-angle between the condenser current andone of the terminal electromotive forces. Switches C and B arethen thrown down, and the deflection D^ noted with switch A thrownup. Finally the instrumental constant is determined by throwing 2192—No. I—09 2 14 Bulletin of the Bureau of Standards. ivoi. 6, No. i. switch A down and C up, and observing the deflection D4. Thisdeflection should be made about the same as D^, by adjusting theresistance R^, whose value must be known. Let ^1 ^2 = constants of instrument as before. 90 ° + ^1, 90 ° + ^2 = angles between condenser current and terminal electromotive forces. 180° — ^ = lag of secondary behind primary emf., so that Di D2 -D3 P4 = deflections. Ri i?2 i?3 = resistances as before. R^ = resistance whose admittance is approximately same as that of = condenser current. 1^=^ = current for calibrating. With the condenser current, /g, in each moving coil in turn we have D, = kj, |i cos (90
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