Fig. 2,392.—Westinghouse electrolytic lightning arrester, for three phase ungrounded neutral service, 25,000 maximum voltage. These arresters are designed for the protection of alternating current circuits from all kinds of static disturbances. They have been standardized for installation on three phase circuits of voltages of 2,200 to 110,000. They cannot be used for voltages of less than 13,500. For voltages below this the horn gaps cannot, with safety, be set close enough together, out of doors, to take advantage of the freedom of discharge of the electrolytic element. If the horn gaps be set too close together they may be short circuited by rain. A shelter should be built for arresters of 13,500 volts and below for their protection when installed outside.
Ques. What action takes place when the trays stand in the electrolyte and cell is disconnected from the circuit?
Ans. Part of the film deteriorates.
Ques. What is the nature of the film?
Ans. The film is composed of two parts, one of which is hard and insoluble, and apparently acts as a skeleton to hold the more soluble part. The action of the cell seems to indicate that the soluble part of the film is composed of gases in a liquid form.
Ques. What action takes place when a cell which has stood for some time disconnected, is reconnected to the circuit?
Figs. 2,393 and 2,394.—Aluminum trays for Westinghouse electrolytic lightning arresters.