Abstract:
A switch including separate switch portions or parts which may be arranged or assembled in various combinations for outdoor or indoor use. The switch parts include a universal tongue adapted to act as a terminal pad and mounting piece for a switch and a universal jaw piece adapted to be assembled on the terminal pad portion of the tongue in various arrangements or configurations. A hinge piece is adapted to pivotally support a blade which may be moved in and out of engagement with the previously described jaw for providing electrical interconnection between circuits connected thereto. The hinge member may also be disposed on the terminal pad portion of the tongue. Electrical contact pieces may be provided as part of a switch, which include copper rivets the heads of which are encapsulated in tungsten alloy or similar material adapted to make repeated electrical contact operations under load conditions without rapid deterioration. When the contact pieces wear, the rivets may be removed and replaced with similar tungsten alloy encapsulated rivet members. This removes the need for complete disassembly of a switch member in the field and complete replacement of a blade. The previously mentioned jaw and hinge member may be mounted in various combinations or arrangements on separate terminal pads. The terminal pads may then be secured to various commercially available and standard support insulators.
Abstract:
A circuit breaker for metal clad switchgear is provided using vacuum-interrupter elements rather than the usually provided air type circuit interrupter. A rigid mounting for one end of the vacuum-type interrupter elements is provided, together with a connector plate structure for the other end of the vacuum interrupter which permits resilient movement of the interrupter end cap in one direction only. A hinged barrier is provided to facilitate access to the vacuum interrupters without removing the barrier. A porcelain push rod is connected directly between the movable operating rod, coming from the vacuum interrupter, and the breaker operating mechanism, thus providing a porcelain-toground insulation path and electrically isolating the operating mechanism from the vacuum interrupter.
Abstract:
A levering and holding device is provided for positioning large circuit breakers in a switchgear compartment or cell. The levering and holding device comprises a box beam which can be secured to the cell walls and a rotatable threaded shaft which is connected to the beam. A threaded shaft has a nut threaded thereon and has one end fixed to the beam. The thread shaft may be rotated with a crank. The breaker is attached to the nut, and as the shaft is rotated, the nut is moved along the shaft and moves the breaker into position. Interlocks are provided to prevent the breaker from being levered into the cell when the beam is not engaged in the cell wall and to prevent the beam from being disengaged from the cell wall unless the breaker is in a fully disengaged position. Another interlock is provided so that when the breaker is closed and in the operating position the threaded shaft cannot be rotated to lever out the breaker.
Abstract:
An improved puffer-type compressed-gas circuit-interrupter is provided having the hollow stationary-contact supported adjacent one end of the generally cylindrical chamber, and the stationary fluid directing orifice structure stationarily supported adjacent the other end of the generally cylindrical chamber, with the movable operating cylinder and movable-contact structure linked together, and simultaneously moved toward said other end of the generally-cylinderal operating chamber over a fixed piston. The construction is such that the gas, compressed by a relative movement of the operating cylinder over the fixed piston, is forced through the stationary insulating fluid-directing orifice member, and then in opposite directions, through the hollow stationary contact structure, and also through the hollow tubular venting movable contact member. The construction is such that ready assembly and disassembly of the operating parts is achieved by closing the ends of the cylindrical interrupting chamber by end-plate structures, through one of which preferably passes, by a sealed connection, the movable-contact operating rod, connected to the operating mechanism. The aforesaid operating mechanism for the movable contact rod is preferably disposed exteriorly of the enclosed generally cylindrical chamber for facilitated maintenance.
Abstract:
A plurality of heat conducting fins disposed on various types of electrical conductors both insulated and uninsulated, and for both high and low voltage applications such as in bus bars, disconnect and knife switches, and circuit breakers. Each of said fins includes a central opening which is slightly smaller in one dimension than the conductor on which the fins are assembled and therefore must be distorted somewhat during assembly on the conductor. The distortion in each fin develops a torsional stress in the fin which causes it to tightly grasp the conductor. In certain high voltage applications, the fin may be insulated or bent over to reduce the effective radial size of the fins in the overall conductor assembly without reducing its surface area and ability to convect heat.
Abstract:
A metal-clad or metal enclosed switchgear cell in which an improved insulating bottle construction is provided for supporting the terminal conductors which a draw-out circuit interrupter engages during normal operation. An improved scheme for mounting necessary current transformers to the insulating bottles is also provided. The main conducting bus is constructed and arranged so that a 4,000 amp self-cooled rating is achieved, and main bus bracing supports are constructed so that the switchgear cell can withstand over 100,000 amps rms asymmetrical momentary current without damage. A simplified lifting scheme is provided, and an indoor switchgear cell can be quickly converted for outdoor use with the addition of a roof and gaskets only.