US3699289A - Operating device for electric switching apparatus for high voltage - Google Patents

Operating device for electric switching apparatus for high voltage Download PDF

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Publication number
US3699289A
US3699289A US181872A US3699289DA US3699289A US 3699289 A US3699289 A US 3699289A US 181872 A US181872 A US 181872A US 3699289D A US3699289D A US 3699289DA US 3699289 A US3699289 A US 3699289A
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US
United States
Prior art keywords
tension rod
lower piston
rod
support insulator
piston
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Expired - Lifetime
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US181872A
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English (en)
Inventor
Sten Berneryd
Hans Backskog
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ABB Norden Holding AB
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ASEA AB
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Filing date
Publication date
Application filed by ASEA AB filed Critical ASEA AB
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Publication of US3699289A publication Critical patent/US3699289A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/42—Driving mechanisms

Definitions

  • This application is related to US. application, Ser. No. l4l,l74, filed May 7, 1971, which shows an operating system in which some features are common with the present invention.
  • the present invention relates to a means for operating at least one contact in an electric switching device for high voltage and relates primarily to voltages of the order of 1,000 kilovolts.
  • the means is of the type in which a movement impulse is rapidly transferred from earth to high potential through a tension rod.
  • the object of the present invention is to effect an operating means which in the above respects is more suitable than corresponding previously known constructions.
  • the operating means comprises a pressurized gas valve placed in the vicinity of the contacts of the switching device at high potential, the movable valve member being controlled from earth potential by means of an insulating tension rod arranged inside a support insulator filled with compressed gas, the tension rod being joined to two pistons which are axially displaceable along cylindrical surfaces at the upper and lower ends of the rod, the upper side of the upper piston being in communication with the open air.
  • the invention is characterized in that the tension rod is arranged upon operation of the contacts to be moved in downward direction from an upper end position in which the upper side of the lower piston lies in sealing abutment with one valve seat and is thus influenced by the pressurized gas in the support insulator on a surface which is smaller than the surface of the upper piston, whereas, when said lower piston is lifted from its seat upon operation of the switching device, it is influenced by the pressurized gas over its entire surface, which is greater than the surface of the upper piston, an electrodynamic operating device being arranged at the lower end of the tension rod to operate the switching device, the electro-dynamic device consisting of a stationary coil and an operating plate connected inductively. to the coil and joined to the tension rod.
  • the operating device may suitably be designed so that the lower piston also acts as operating plate, in which case a separate plate is not necessary. This involves a considerable simplification.
  • Switching apparatus of the type in question are usually designed for automatic rapid re-closing and it is thus desirable for the tension rod to be quickly returned to its initial position after operation. This can easily be achieved by means of a valve plate joined by a spring to the lower piston and closing the outlet opening from a cylinder chamber arranged under the lower piston. At the final stage of the opening movement pressurized gas is supplied to this cylindr chamber from the upper side of the piston through a pressure equalizing channel.
  • the device according to the invention can be designed so that at least two pneumatic valves at high potential are arranged to 'be influenced by a number of cams supported by the tension rod. Suitable time delay between the release impulses to the various contacts can thus easily be adjusted by attaching the cams to the rod in such a way that the distance between them can be altered.
  • FIG. 1 showing the principle for transmission of the release impulses from earth to high potential
  • FIG. 2 shows the operating member arranged at earth potential in closer detail.
  • FIG. 1 shows schematically two pneumatic valves 1 and 2 placed at high potential and intended while emit power impulses to a power contact and a resistor contact, respectively, in an electric switching device, for example an air blast circuit breaker.
  • the valves are shown in their normal positions in which the pneumatic operating mechanism of the contacts, not shown, is in communication with the open air through two conduits 3 and 4 and outlet channels 5 and 6. Release of the contacts is effected by opening the valves 1 and 2 so that the two conduits 3 and 4 are placed under pressure from a hollow support insulator 7 filled with pressurized gas and is fed by a conduit 8 from a source of pressurized gas arranged at earth potential.
  • the valves 1 and 2 are opened by two cams 9 and 10 which are attached to a vertical tension rod 11 of insulating material arranged inside the support insulator 7 which rod is provided at its upper end with a piston 12 and at its lower end with a piston 13 having a larger diameter than the piston 12.
  • the pistons are axially displaceable along cylindrical surfaces 14 and 15 at the upper and lower ends of the rod. Between the pistons and the cylindrical surfaces are sealing rings.
  • the lower side of the lower piston 13 limits a cylindrical space 16 which during normal operation is in communication with the open air through an axially arranged outlet opening 17.
  • the lower piston 13 In the position of rest of the switching device, the lower piston 13 is pressed against a valve seat 18 (FIG. 2) arranged on the upper side of the piston due to pressure on the piston 12 at the upper end of the rod.
  • the switching device is operated by a previously charged capacity being discharged through an induction coil 19 arranged around the valve seat 18 so that a current is induced in the piston 13 which is made of material having good electrical conductivity, for example aluminium, or has a short-circuiting ring made of such material.
  • the piston 13 is pushed away from the valve seat 18 with considerable force.
  • the gas pressure in the support insulator 7 then operates over the entire surface of the piston 13 so that the movement continues even after the force coming from the electrodynamic operating device has ceased.
  • the tension rod 11 is returned when pressure equalization is achieved in the cylindrical space 16 below the piston 13 through a by-pass flow channel 20 after a valve plate 22 connected by a spring 21 to the piston 13 has closed the outlet opening 17 to the atmosphere.
  • the plate 22 is returned by the spring 21 since atmospheric pressure is reestablished in the cylinder space 16 through an equalizing hole 23.
  • the electrodynamic and pnuematic functions can be separated by placing an induction coil 27 with a separate operating plate 24 completely outside the cylinder space 16, as indicated by dotted lines in FIG. 2.
  • the electro-dynamic system can then more easily be dimensioned so that greater operating power is obtained. Furthermore, a more favorable I'ield pattern is obtained around the coil and the efficiency of the system is thus improved.
  • the invention is not limited to the embodiment shown.
  • the tension rod 11, for example, need not affect the contacts of the switching device through camcontrolled pneumatic valves.
  • the rod may be connected to the contacts or made to operate the contacts in any other suitable manner.
  • the operating device may also be combined with conventional means for damping and braking.
  • Means for operating at least one contact in an electric switching device for high voltage comprising a pneumatic valve (I) placed at high potential, a hollow supportinsulator (7) adapted to be filled with compressed gas carrying said pneumatic valve at its upper end, an insulating tension rod (11) movable upward and downward within said support insulator, means forming cylindrical surfaces (14,15) adjacent the top and bottom of said support insulator, a valve passage between the cylindrical surfaces having a valve seat, upper and lower piston means (12,13) connected to said tension rod and slidable within said cylindrical surfaces, the cross-sectional area of the lower piston means being greater than that of the upper piston means, the cross-sectional area of the valve seat being less than that of the upper piston means, the top surface of the upper piston means being exposed to atmospheric pressure, means “for moving said tension rod downwardly from an upper end position in which the top surface of the lower piston means lies in scaling abutment with said valve seat (18) and is thus influenced by the pressurized gas in the support insulator on a part of its surface

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  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US181872A 1970-10-02 1971-09-20 Operating device for electric switching apparatus for high voltage Expired - Lifetime US3699289A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE13378/70A SE346050B (en, 2012) 1970-10-02 1970-10-02

Publications (1)

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US3699289A true US3699289A (en) 1972-10-17

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Application Number Title Priority Date Filing Date
US181872A Expired - Lifetime US3699289A (en) 1970-10-02 1971-09-20 Operating device for electric switching apparatus for high voltage

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US (1) US3699289A (en, 2012)
CA (1) CA934417A (en, 2012)
SE (1) SE346050B (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2462012A1 (fr) * 1979-07-16 1981-02-06 Alsthom Cgee Dispositif de manoeuvre d'un disjoncteur
EP0049375A1 (de) * 1980-10-06 1982-04-14 Licentia Patent-Verwaltungs-GmbH Autopneumatischer SF6-Druckgasschalter mit pneumatischem Antrieb

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3256414A (en) * 1962-03-30 1966-06-14 Bbc Brown Boveri & Cie Operating mechanism for electrical circuit breaker of the gas blast type
US3420972A (en) * 1965-06-01 1969-01-07 Asea Ab High voltage gas blast circuit breaker
US3532843A (en) * 1966-08-29 1970-10-06 Asea Ab Connection equipment for high voltage switching device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3256414A (en) * 1962-03-30 1966-06-14 Bbc Brown Boveri & Cie Operating mechanism for electrical circuit breaker of the gas blast type
US3420972A (en) * 1965-06-01 1969-01-07 Asea Ab High voltage gas blast circuit breaker
US3532843A (en) * 1966-08-29 1970-10-06 Asea Ab Connection equipment for high voltage switching device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2462012A1 (fr) * 1979-07-16 1981-02-06 Alsthom Cgee Dispositif de manoeuvre d'un disjoncteur
EP0049375A1 (de) * 1980-10-06 1982-04-14 Licentia Patent-Verwaltungs-GmbH Autopneumatischer SF6-Druckgasschalter mit pneumatischem Antrieb

Also Published As

Publication number Publication date
CA934417A (en) 1973-09-25
SE346050B (en, 2012) 1972-06-19

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