Recloser means for reclosing interrupted high voltage electric circuit means

• US 5,175,403 A
• Filed: 08/22/1991
• Issued: 12/29/1992
• Est. Priority Date: 08/22/1991
• Status: Expired due to Term

• Current Assignee: Cooper Power Systems Incorporated (Eaton Corporation PLC.)
• Original Assignee: Cooper Power Systems Incorporated (Eaton Corporation PLC.)
• Inventors: Wainio, Ronald A., Hamm, Sidney R.
• Primary Examiner(s): Broome, Harold
• Application Number:
  US07/748,653
• Time in Patent Office: 495 Days
• Field of Search: 200/144 B, 200/145, 335/239, 335/240
• US Class Current: 218/120
• CPC Class Codes: H01H 1/5822 Flexible connections between movable contact and terminal
• CPC Class Codes: H01H 2033/6667 Details concerning lever type driving rod arrangements
• CPC Class Codes: H01H 33/022 particular to three-phase circuit breakers synchronous switching H01H9/563
• CPC Class Codes: H01H 33/565 Gas-tight sealings for moving parts penetrating into the reservoir
• CPC Class Codes: H01H 33/666 Operating arrangements
• CPC Class Codes: H01H 50/305 damping vibration due to functional movement of armature in air-gap H01H50/163

Abstract

An interrupted electric circuit recloser for reclosing an interrupted high voltage electric circuit system and a solenoid to be utilized for use in a sealed pressurized dielectric gaseous atmosphere. The recloser has a sealed tank and a solenoid therein. The solenoid has a plunger connected through a yoke for returning vacuum contact back to a closed contacting position, a dampener for regulating the opening movement of the plunger, a dielectric gas filling the sealed chamber and permeating the solenoid and acted on by the solenoid plunger. The solenoid also has a central chamber complimentarily accepting the plunger. The central chamber of the solenoid is substantially closed at one end and permits the ingress of the dielectric gas when the plunger is moved in an outward direction within the central chamber away from the closed end and a second dampener controlling the solenoid plunger'"'"'s movement toward the closed end.

Claims

1. An interrupted electric circuit recloser means for reclosing an interrupted high voltage electric circuit system, said recloser means including means for opening multiple vacuum contact means which will be tripped and separated by the absence/excess or severe reduction in normal high voltage, an enclosure means having a sealed tank and cover for encasing the parts of said recloser means in a sealed chamber, a solenoid means in said sealed tank and including a solenoid plunger means connected through a yoke means for returning said vacuum contact means back to a closed contacting position, dampening means for regulating the opening movement of said solenoid plunger, a dielectric gas filling said sealing chamber and permeating said solenoid and acted on by said solenoid plunger, said solenoid including a central chamber complimentarily accepting said solenoid plunger and with said central chamber of said solenoid being substantially closed at one end, said central chamber including means in said closed end to permit the ingress of said dielectric gas when said solenoid plunger is moved in an outward direction within the central chamber away from said closed end and a second dampener means controlling said solenoid plunger'"'"'s movement toward said closed end.

2. A recloser as claimed in claim 1 wherein said solenoid is axially disposed in a vertical position with said closed end being disposed at the bottom of said solenoid chamber and with the upper opposite other end of said chamber being substantially open, said plunger including link means extending upwardly out said open other end of said solenoid chamber and said yoke means connecting said link means to said contact means, recloser opening spring means, plunger latch means releasing said opening spring means and permitting it to draw said plunger upwardly whereby said plunger will extend partially out of said solenoid chamber, said link means and said yoke means connected to and causing said vacuum contact means to open, said dielectric gas means flowing into said solenoid chamber vacated by said plunger upward movement, and controlled orifice means in said closed end to permit the ingress of said dielectric gas means into said chamber, said orifice means also assist in the controlling the egress of said dielectric gas means when said plunger compresses same during its downward stroke, said downward stroke causing said link and yoke means to close said vacuum contact means.

3. A recloser as claimed in claim 2 wherein said link means includes an actuator adapted to close said vacuum contact means on said downward stroke of said link means and includes a second damper means acting on said actuator during said opening operation to limit opening rebound of said contacts.

4. A recloser as claimed in claim 3 wherein said actuator is a coaxial assembly including said vacuum contact means having a pair of isolated co-axially disposed contact means within an evacuated chamber including a fixed lower contact that has externally extending current carrying means, a moveable upper contact that also has integral externally extending rod-like moveable current carrying means, current exchange means having clamping means for generally co-axially gripping said rod-like means and connector means for accepting conductor means, said current exchange means also having piston-like means projecting co-axially from its end opposite said gripping means, inverted cup-like cylinder means having an open lower end and an apertured upper closed end adapted for complimentary sliding acceptance of said piston-like means within said lower open end, spring-loaded rod means telescopically accepted within said apertured closed end and providing means for bearing on the free end of said piston-like means, yoke means interconnected with said link means adapted to transmit active movement of said solenoid means to said moveable contact means in said vacuum evacuated chamber through said spring-loaded rod means and said current exchange means.

5. A recloser as claimed in claim 3 wherein when said plunger reaches the top of its opening stroke it contacts a closing circuit energizing the closing coil of said solenoid thereby drawing said plunger and said link back down to repeat the contact closing operation, means for controlling the dampening of the downward movement of said plunger and regulating its velocity.

6. A recloser as claimed in claim 5 wherein movement of said plunger downwardly in the process of closing said contacts reactivates the stored power of said opening spring means for immediate availability if another or a continuing interruption takes place.

7. A recloser as claimed in claim 6 wherein said recloser includes counting means whereby said recloser will carry out a full cycle of attempting to maintain the contacts in a reclosed condition a predetermined number of times, upon reaching said predetermined number of times if the attempt to maintain the contacts in a reclosed condition is not possible then the counting means causes the recloser to cease any further automatic attempts.

8. A recloser as claimed in claim 1 wherein said dielectric gas means is pressurized and comprises sulfur hexafluoride chosen to replace oil which exhibited the tendency to produce a fire and explosion hazard.

9. A recloser as claimed in claim 1 wherein said vacuum contact means are multiple in number and are each encased in a separate evacuated vacuum maintaining interrupter casing, moveable means extending externally of said interrupter casings to permit actuation of said contacts by motion of said moveable means, a yoke means connected to said moveable means of each of said casings to permit said contact means collectively to separate in one direction and close in the opposite direction, said yoke connected by a link to said solenoid plunger for movement by activation of said solenoid.

10. A recloser as claimed in claim 9 wherein said vacuum maintained contact interrupters are three in number.

11. A recloser as claimed in claim 1 wherein said solenoid is operable by said high voltage electric circuit.

12. A recloser as claimed in claim 11 wherein said solenoid is adapted to accept high voltages in the range of 14.4 kV to 26 kV at sixty (60) hertz as well as short term impulse voltages in excess of said range.

13. A recloser as claimed in claim 12 wherein said solenoid is also adapted to operate on direct current voltages in the order of 240 VDC.

14. A recloser as claimed in claim 1 wherein said solenoid includes a solenoid frame with spaced ends, a coil form having at least one open end and one closed end supported within said spaced ends of said frame and forming said central chamber, a pot coil encircling said coil form and capable of accepting and being activated by high voltages, i.e. in the range of 14.4 kV to 26 kV at sixty (60) hertz and impulse voltages in excess of said range;

as well as low direct current voltage supply i.e. 240 VDC;

said solenoid plunger means being telescoped through a central opening in the upper end of said solenoid frame into said co-axial central chamber of said coil form, said central opening in the upper end of said frame being complimentary to said plunger, said dielectric gas filling said central chamber and causing a cushioning and dampening effect on movement of said plunger in a downward, as well as in an upward, direction, said plunger having means for controlling movement of said gas past its sides during movement through said upper solenoid frame means.

15. A recloser as claimed in claim 14 wherein said means for controlling movement of said gas includes said plunger being provided with axially extending radial slot means at opposite ends of said plunger said slot means communicating with said chamber and extending axially for a substantial portion of the length of said plunger, whereby said gas can find egress from said chamber through said slot means when said plunger is partially retracted from said chamber.

16. A recloser as claimed in claim 15 wherein the opposite lower end of said solenoid frame includes a central aperture adapted to accept a plunger stop for limiting the downward movement of said plunger, said plunger stop including a central bore communicating from end to end and aligned with said central aperture, and a spring loaded orifice plate means restricting said central bore and aperture, whereby increased pressure of said gas upon compression by said plunger causes said plate to move against its said spring loading to thereby permit lateral egrees of gas between said plate and the bottom ed of said plunger stop and said solenoid frame.

17. A recloser as claimed in claim 16 wherein said orifice means includes a check valve means communicating with said central bore of said plunger stop.

18. A recloser as claimed in claim 17 wherein said check valve includes ball cock means which when seated during the closing operation and the downward movement of said plunger to close said contacts the gas is compressed within said chamber and its downward movement is fully dampened, however, said check valve orifice is open on opening upward movement of said plunger and permits limited movement of said plunger return.

19. The recloser of claim 1 wherein said sealed chamber assembly includes a modular assembly consisting of a tank and cover assembly with bearing and sealing means, thereby providing rotational support and a gas pressure seal respectively, said modular sealed chamber assembly further including:

a first seal means for sealing said tank to said cover assembly;

a second seal means for sealing said cover assembly to a shaft; and

a means for attaching said tank to said cover assembly.

20. The recloser of claim 19 wherein said seal assembly comprises a modular assembly consisting of two housings, including a bearing housing and a seal housing, required for sealing a flanged type rotary seal.

23. A recloser as claimed in claim 4 wherein said second damper means includes said dielectric gas means infiltrating said inverted cup-like means and when compressed by movement of said piston-like means within said cup-like means serves to cushion and dampen the movement of said coaxially disposed contact means within said evacuated chamber and thereby forming said second damper means to reduce bounce and possible arcing during the opening of said contacts.

24. A recloser as claimed in claim 23 said enclosing means forming said sealed chamber for said recloser including a tank assembly and a cover assembly, said cover assembly having substantially rigid frame means extending therefrom and acceptable within said tank assembly to mount and maintain said solenoid means, said associated link means, and said vacuum contact means and its associated actuator means in generally compact spaced parallel operable interelationship.

21. A solenoid for use in a sealed pressurized dielectric gaseous atmosphere including in combination a pressurized container accepting a predetermined pressurized dielectric gas, said solenoid having a magnetizable solenoid frame, a coil assembly including a pot coil wound on a hollow bore coil form with leads connected to a high voltage system through a switch connected to said solenoid, said solenoid frame supporting said coil assembly from end at the top of said coil form, a magnetizable solenoid plunger, a central aperture in said solenoid frame guiding said plunger into coaxial movement within said coil form hollow bore, a magnetizable apertured bride plate spaced from said solenoid frame and supporting said coil assembly from the opposite bottom end, said solenoid frame, said coil form and said bridge plate each serving as part of a magnetic circuit, a gas pressure relief means located at the bottom end of said hollow bore, said bridge plate supporting a plunger stop means adapted to stop said plunger during the closing operation when said plunger is magnetically drawn axially within said hollow form bore, said plunger stop means being an assembly consisting of at least a resiliency absorbent non-metallic stop, and a non-magnetic metallic ring spacer between said absorbent stop and said plunger stop means, a plurality of stringer means used to space and clamp said solenoid frame, said pot coil, said coil form and said bridge plate together to withstand the resulting magnetic forces and form a part of said magnetic circuit, said gas pressure relief means utilized to regulate the pressure or vacuum produced in the hollow coil form chamber during the closing and opening operations respectively, said solenoid plunger including axially extending radial slots cut to a depth and length to limit eddy current losses and to adjust the vacuum upon the opening of the solenoid by movement of the plunger outwardly through said coil frame central aperture, said slots also adjusting the pressure buildup after a closing operation, and linkage means connected to said plunger to provide a motive force for operation of secondary means.

22. A solenoid as claimed in claim 21 wherein said dielectric gas is sulfur hexafluoride.

25. An interrupted electric circuit recloser means for reclosing an interrupted high voltage electric recloser means for reclosing an interrupted high voltage electric circuit including a sealed tank chamber for enclosing said recloser means, a dielectric pressurized gas filling said sealed tank chamber, said recloser having vacuum contact means which will be tripped and separated by the absence/excess or severe reduction in normal high voltage, said vacuum contact means including compact coaxial dampener means for preventing bounce of said contact means during opening of said interrupted high voltage circuit, and high voltage solenoid means including link means interconnected with said vacuum contact means adapted to activate means to a close condition, said solenoid having integral coaxial dampener means for controlling bounce of said contact means during closing of said circuit.