Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation
Patent
1989-05-24
1991-03-19
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
High voltage dissipation
361120, 361126, H02H 324
Patent
active
050015877
ABSTRACT:
A surge suppressor suitable for protecting railroad switching systems from lightning directly striking a rail of a railroad track includes a pair of spark gap surge suppressors each coupled between a ground conductor and a corresponding rail. A spark gap equalizer is connected between the first and second conductors coupled to the rails, respectively. A first inductor is connected between the first conductor and a first output terminal, which is coupled to an input of the railroad switching system. A second inductor is connected between the second conductor and a second output, which is connected to another input of the railroad switching system. A first surge suppressor diode is connected between the first and second output conductors, and a second surge suppressor diode is connected in the opposite direction between the first and second output conductors. The surge suppressor provides a steady level of voltage clamping to the railroad signaling equipment despite increasing breakdown voltages of the air gap surge suppressors and the air gap equalizer device caused by suppressing voltage surges produced by a number of lightning strikes and the resulting melting pointed teeth in the air gap devices.
REFERENCES:
patent: 3793535 (1974-02-01), Chowdhuri
patent: 4389695 (1983-06-01), Carpenter, Jr.
patent: 4539617 (1985-09-01), Delaney et al.
patent: 4586104 (1986-04-01), Standler
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patent: 4698722 (1987-10-01), Kron
patent: 4777555 (1988-10-01), Esculpavit et al.
patent: 4802055 (1989-01-01), Beckerman
Jennings Derek S.
Square D Company
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