Improvements in and relating to leading-in insulators in combination with lightning protectors for telegraphic purposes

摘要

245,221. Tremain, W. E. Oct. 11, 1924. Protective arrangements. - In a com- .bined line insulator and lighting protector the circuit between two or more wires connected to the insulator is broken to facilitate localization tests by removing the protector. An insulator 4 has a screwed cap 26 forming a chamber enclosing the protector which is adapted to make connection between fixed line terminals 5, 6 and with a metal bush 3 which screws on to the earthed spindle 1. The connections between the line wires and the terminals are adapted to be sealed by compound in a channel 13. The protector is formed by a discharge gap between electrodes in a container enclosing a hard vacuum. The electrodes may be of carbon or of metal and may form a part of the vessel enclosing the vacuum. A plurality of gaps may be provided so that a number of wires may be connected. As shown in Fig. 1, carbon electrodes 14, 15 upon a porcelain base are connected by wires passing through a glass tube on each side of a glass partition therein to a terminal contact 21 and a metal cap 23 respectively. These are mounted on a glass bulb 25 and the cap is screwed into the gap between the terminals 5, 6. According to Fig. 4 the electrodes 14, 15 are secured on slotted tubes projecting from metal caps 30, 31 which are united to a glass separator 32, ridged to prevent external sparking and the protector is secured between springs 34, 35 by a metal cap 33 screwed on to the terminals 5, 6. Fig. 6 shows a protector in which a metal cap 15 forms one electrode and the container is completed by a glass member 42 carrying a metal disc 38 attached to a second electrode 14 by a frame 37. The cap 15 is secured to a metal ring 43 which screws on to the terminals 5, 6.