US3612798A — Airblast circuit breaker with improved sealing me…

Claim 1

Independent Claim 277 words

A high-voltage electric circuit breaker of the airblast type comprising: a. a plurality of interrupter tanks at a high voltage, each containing high-pressure air and circuit-interrupting means disposed in said high-pressure air, b. at least one high-voltage bushing for each tank projecting into said tank and containing an interior space filled with a pressurized gaseous dielectric other than air, c. a plurality of generally vertically extending hollow insulating columns respectively supporting said tanks, each being filled with air at a pressure lower than the normal pressure in said tanks, d. a plurality of air lines primarily of insulating material for respectively supplying high-pressure air to said interrupter tanks, e. each of said air lines extending generally vertically through the hollow insulating column on which its associated tank is supported, f. means for sealing the interior of each of said air lines from the interior of its associated insulating column in a manner that allows a portion of said air line to move relative to said insulating column in response to temperature changes, g. a high-voltage current transformer mounted adjacent one of said supporting columns and comprising a generally vertically extending insulating housing filled with gaseous dielectric of the same type as in said bushings and further comprising a high-voltage primary winding extending through said insulating housing, h. means located atop said insulating columns and said insulating housing for interconnecting said insulating housing and the interior spaces in said bushings to allow said insulating housing to act as a reservoir from which the gaseous dielectric supply in said bushings can be replenished, and i. means for electrically connecting in series said interrupting means and said high-voltage primary winding.

Claim 2

Dependent Claim 277 words

A high-voltage electric circuit breaker of the airblast type comprising: a. a plurality of interrupter tanks at a high voltage, each containing high-pressure air and circuit-interrupting means disposed in said high-pressure air, b. at least one high-voltage bushing for each tank projecting into said tank and containing an interior space filled with a pressurized gaseous dielectric other than air, c. a plurality of generally vertically extending hollow insulating columns respectively supporting said tanks, each being filled with air at a pressure lower than the normal pressure in said tanks, d. a plurality of air lines primarily of insulating material for respectively supplying high-pressure air to said interrupter tanks, e. each of said air lines extending generally vertically through the hollow insulating column on which its associated tank is supported, f. means for sealing the interior of each of said air lines from the interior of its associated insulating column in a manner that allows a portion of said air line to move relative to said insulating column in response to temperature changes, g. a high-voltage current transformer mounted adjacent one of said supporting columns and comprising a generally vertically extending insulating housing filled with gaseous dielectric of the same type as in said bushings and further comprising a high-voltage primary winding extending through said insulating housing, h. means located atop said insulating columns and said insulating housing for interconnecting said insulating housing and the interior spaces in said bushings to allow said insulating housing to act as a reservoir from which the gaseous dielectric supply in said bushings can be replenished, and i. means for electrically connecting in series said interrupting means and said high-voltage primary winding.

Claim 3

Dependent Claim 182 words

The circuit breaker of claim 1 in which: a. at least one of said insulating columns comprises a tubular casing primarily of insulating material and a pair of end plates respectively secured in sealed relationship to the upper and lower ends of said tubular casing, b. the air line that extends through said one insulating column comprises a long slender tubular portion of insulating material and a pair of tubular metal fittings secured in sealed relationship to opposite ends of said tubular insulating portion, c. means is provided for securing the lower one of said end fittings to the lower one of said end plates in sealed relationship thereto, d. said air line further comprises a metal pipe fixed to said upper end plate and having a bore receiving said upper metal end fitting in sliding relationship and ring-type sealing structure between the outer surface of saiD metal fitting and said bore for providing a seal therebetween that allows sliding motion of said upper end fitting within said bore, e. said metal pipe extends from said upper end plate to said tank.

Claim 4

Dependent Claim 114 words

The circuit breaker of claim 2 in which: a. said metal pipe is fixed to said upper end plate by releasable fastening means which allows said metal pipe to be detached from said upper end plate, b. said metal pipe is slidable within the wall of said tank so that following detachment from said upper end plate said pipe can be raised partially into said tank, c. said interrupting means and said pipe are so constructed that the pipe, when detached from said upper end plate, can be raised sufficiently into said tank to expose said ring-type sealing structure and allow for its replacement without necessitating removal of said tank from said insulating column.

Claim 5

Dependent Claim 252 words

A high-voltage electric circuit breaker of the airblast type comprising: a. an interrupter tank at a high voltage containing high-pressure air and circuit-interrupting means disposed in said high-pressure air, b. a generally vertically extending hollow insulating column supporting said tank and filled with gas at a pressure lower than the normal pressure in said tank, c. said insulating column comprising a tubular casing primarily of insulating material and a pair of end plates respectively secured in sealed relationship to the upper and lower ends of said tubular casing, d. an air line for supplying high-pressure air to said interrupter tank, said air line extending generally vertically through said hollow insulating column, e. said air line comprising a long slender tubular portion of insulating material and a pair of tubular metal fittings secured in sealed relationship to opposite ends of said insulating material portion, f. means for securing the lower one of said end fittings to he lower one of said end plates in sealed relationship thereto, g. said air line further comprising a metal pipe fixed to said upper end plate and having a bore receiving said upper end fitting in slidable relationship, h. ring-type sealing structure between the outer surface of said metal fitting and said bore for providing a seal therebetween that allows sliding motion of said upper end fitting within said bore when said insulating material portion changes its length in response to temperature changes, and i. said metal pipe extending from said upper end plate to said tank.

Claim 6

Dependent Claim 252 words

A high-voltage electric circuit breaker of the airblast type comprising: a. an interrupter tank at a high voltage containing high-pressure air and circuit-interrupting means disposed in said high-pressure air, b. a generally vertically extending hollow insulating column supporting said tank and filled with gas at a pressure lower than the normal pressure in said tank, c. said insulating column comprising a tubular casing primarily of insulating material and a pair of end plates respectively secured in sealed relationship to the upper and lower ends of said tubular casing, d. an air line for supplying high-pressure air to said interrupter tank, said air line extending generally vertically through said hollow insulating column, e. said air line comprising a long slender tubular portion of insulating material and a pair of tubular metal fittings secured in sealed relationship to opposite ends of said insulating material portion, f. means for securing the lower one of said end fittings to he lower one of said end plates in sealed relationship thereto, g. said air line further comprising a metal pipe fixed to said upper end plate and having a bore receiving said upper end fitting in slidable relationship, h. ring-type sealing structure between the outer surface of said metal fitting and said bore for providing a seal therebetween that allows sliding motion of said upper end fitting within said bore when said insulating material portion changes its length in response to temperature changes, and i. said metal pipe extending from said upper end plate to said tank.

Claim 7

Dependent Claim 114 words

The circuit breaker of claim 4 in which: a. said metal pipe is fixed to said upper end plate by releasable fastening means which allows said metal pipe to be detached from said upper end plate, b. said metal pipe is slidable within the wall of said tank so that following detachment from said upper end plate said pipe can be released partially into said tank, c. said interrupting means and said pipe are so constructed that the pipe, when detached from said upper end plate, can be raised sufficiently into said tank to expose said ring-type sealing structure and allow for its replacement without necessitating removal of said tank from said insulating column.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-10-11	1975-04-12	1975-10-12	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-10-11	1979-04-12	1979-10-12	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-10-11	1983-04-12	1983-10-12	$7700.00	Window Closed / Lapsed

Airblast circuit breaker with improved sealing means

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