GB1173686A - Spark Gap. - Google Patents

Abstract

1,173,686. Surge diverters. OHIO BRASS CO. 22 May, 1967 [1 Dec., 1966], No. 23642/67. Heading H2H. The various stages of a surge diverter, whose circuit connections and method of operation are generally similar to those disclosed in Specification 1,173,685, are constructed in pairs comprising ceramic end plates 62, 63, each carrying a pair of main gap electrodes 72, 73 and having ridges and recesses which co-operate with corresponding ones in the faces of a ceramic centre plate 65 to form arcing chambers and chambers for the reception of the other components. Electrodes 73, 98 of each stage are electrically connected by a pin 107 which may be riveted over to hold the three plates together while their peripheral ridges and recesses are bonded and sealed by an epoxy resin. Alternatively, the plates may be held in a jig while the resin is cured, after which heads are formed on the pin 107 to make an electrical or an electrical and mechanical connection between the electrodes 73, 98. The chambers and components of the two stages are staggered by 180 degrees, each stage further comprising electrodes 79, 80 which constitute a pre-ionizer for the main gap and are formed of cylindrical bodies of resistive material to act as series resistors connected, with the electrodes 79, 80, across the main gap. A grading resistor 55 (or a capacitor) is also connected in parallel with the main gap and is housed with the electrodes 79, 80. Interior surfaces 93, 94 define an arc extinguishing chamber forming a continuation of the arc elongation chamber defined by the co-operating recesses in adjacent plates. Members 55, 79, 80 are carried by a ceramic member 77 resin-bonded to the end plate 63, which is identical in shape and construction to the other end plate 62. A four-stage unit is described, Fig. 3 (not shown), and comprises a magnetic blow-out coil sandwiched between two pairs of stages constructed as described above. Two such units are combined with non-linear resistors and further grading resistors, all of which are housed in a sealed insulator to form a surge diverter, Fig. 1 (not shown).