. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. uarter period, or 90°, the phase difference between current and condenser pressure is condenser pressure reaching a positive maximum when the current starts from zeroon the positive wave, is 90° ahead of the current. Ques. What does this indicate? Ans. It shows that the phase difference between the waverepresenting the condenser pressure and the curr
. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. uarter period, or 90°, the phase difference between current and condenser pressure is condenser pressure reaching a positive maximum when the current starts from zeroon the positive wave, is 90° ahead of the current. Ques. What does this indicate? Ans. It shows that the phase difference between the waverepresenting the condenser pressure and the current is 90°, asillustrated in fig. 1,327. Ques. Is the condenser pressure ahead or behind thecurrent and why? Ans. It is ahead of the current. The condenser pressure,when the condenser is discharged being zero, the current enters 1,086 HAWKINS ELECTRICITY at maximum velocity as at -4 in fig. 1,327, and gradually de-creases to zero as the condenser pressure rises to maximum at B,this change taking place in one-quarter period. Thus thecondenser pressure, which opposes the current, being at a maxi-mum when the current begins its cycle is 90° aitead of the current,as is more clearly seen in the last quarter of the cycle (fig. 1,327).. CAPACITY PRESSURE90° BEHIND THE CURRENT Fig. —Current and pressure curves, showing phase relation between the current, con-denser pressure, and impressed or capacity pressure necessary to overcome the condenserpressure. The capacity pressure, since it must overcome the condenser pressure, isequal and opposite to the condenser pressure, that is. the phase difference is 1K0°. Thecondenser pressure being 90° ahead of the current, the impressed pressure is 90* behindthe current. Ques. What is the phase relation between the con-denser pressure and the pressure applied to the condenserto overcome the condenser pressure? Ans. The pressure applied to the condenser to overcome thecondenser pressure, or as it is called, the capacity pressure, must
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