Oscillograph records show that the effect of the oil is to allow the arc to continue during several cycles and then to break the current, usually at the zero point of the wave.
Remote Control Oil Switches.—It is desirable in the case of switches on high pressure circuits to locate the parts which carry the high pressure current at some distance from the switchboard in order that they may be operated with safety.
With respect to the manner in which the switches are operated they may be classed, as
- 1. Hand operated;
- 2. Power operated.
Figs. 2,228 and 2,229.—Views showing mechanism of hand operated remote control switches. Fig. 2,228, straight mechanism; fig. 2,229, angular mechanism.
Ques. What kind of power is used?
Ans. Electricity is used in most cases; in some installations, switches are operated by compressed air.
Ques. For what pressures should remote control switches be used?