Electricity: electrical systems and devices – Safety and protection of systems and devices – Transformer protection
Patent
1989-02-03
1990-12-25
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transformer protection
361 38, 361 39, 361126, H02H 906
Patent
active
049807897
ABSTRACT:
A two-stage gapped low voltage surge arrester for dissipating transformer secondary side current surges includes an arc strap in series with a resistive grommet. The combination is mounted on the grounded transformer housing adjacent a line potential bushing such that a first spark gap is formed between the bushing stud and arc strap. The resistive grommet is grounded to the transformer ground pad by metallic fasteners such that a second spark gap is formed in parallel with the resistive grommet. Surges entering the transformer secondary winding of sufficient magnitude induce the first spark gap to flash over, shunting potentially damaging currents outside the transformer through the arc strap and resistive grommet. At even higher currents, the voltage across the resistive grommet exceeds the flash over voltage of the second spark gap and shunts the surge around the resistive grommet.
REFERENCES:
patent: 1274428 (1918-08-01), Lee
patent: 1310054 (1919-07-01), Brown
patent: 2018672 (1935-10-01), Hill
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patent: 4320432 (1982-03-01), Dunke
patent: 4604673 (1986-08-01), Schoendube
TMX-703-B L. V. Bushing Assemably Dwg., dated 6/57 by Line Material Co.
Hopkinson Phillip J.
Mayall, deceased George W.
Smith Stephen D.
Conley Ned L.
Cooper Industries Inc.
Deboer Todd E.
Maag Gregory L.
Rose David A.
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