Signals and indicators – Indicators – Chemically activated type
Patent
1983-08-26
1986-01-28
Frankfort, Charles
Signals and indicators
Indicators
Chemically activated type
116209, 116DIG33, 361124, 361125, 361137, G01D 304
Patent
active
045664013
ABSTRACT:
An improved dynamic current interruption-type flashover indicator responsive to lightning strikes for releasing from the tip of arc horns located on power transmission towers and for interrupting the resulting dynamic current. The present invention utilizes a uniquely designed propellant having a formed center hole extending the longitudinal length of the propellant and containing therein a fuse wire extending from a separation plate at one end and engaging an inserted pin at the other end. When lightning strikes, the resulting arc is lead into and throughout the formed center hole by the fuse wire, the fuse wire melts and the temperature of the arc causes the propellant to vaporize uniformly into steam and the resulting gaseous force causes the indicator to become rocket-like and to suddenly leave the tip of the arc horn. The resultant vapor trail of the flashover indicator being of high conductivity leads the dynamic current away from the transmission tower in order to substantially cut down on the dynamic current.
REFERENCES:
patent: 1116303 (1914-11-01), Locke
patent: 1127043 (1915-02-01), Locke
patent: 2609432 (1952-09-01), Steen
patent: 2989608 (1961-06-01), Hicks
patent: 3422763 (1969-01-01), Wait
patent: 3668458 (1972-06-01), Irle
patent: 3894086 (1975-07-01), Lerom
Corr Denis E.
Frankfort Charles
Kinki Denki Co., Ltd.
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