A choke coil alone sufficiently powerful to accomplish this would be too large and costly on very high pressure and would interfere with the operation of the system.
Ques. How is the condenser and choke coil connected?
Ans. The condenser is connected between the line and ground behind the choke coil near the apparatus to be protected as shown in fig. 2,413.
Fig. 2,413.—Diagram showing connections of static interrupter for protecting a transformer.
Ques. What is the effect of the condenser?
Ans. The condenser, which has a very small electrostatic capacity, has no appreciable effect upon the normal operation, but a very powerful effect upon the static wave on account of its extremely high frequency.