Abstract: The neutral cross bus in a switchgear assembly formed from two sets of side-by-side cabinets includes first and second neutral buses for the respective sets of cabinets. Each neutral bus is made up of a stack of flat conductors oriented horizontally in a main section extending across the cabinets of the set and vertically in a terminal section confronting the terminal section of the other neutral bus. The vertically oriented terminal sections are easily bolted together despite their limited accessibility when the two sets of cabinets are installed side-by-side. The flat conductors of the neutral cross bus are supported in their horizontal main sections by spaced supports formed by planar members with spaced horizontal slots set on edge and mounted by end flanges.

Abstract: In an overhead power line switch, critical switch adjustment dimensions, switch position, switch status and other switch parameters are sensed by a plurality of particularly placed sensors, allowing determination as to whether the switch has operated correctly at critical points of the switch. The sensors also provide critical maintenance indication as to the operational status of the switch. In a preferred arrangement, the sensors are positioned to sense at least one of whether the contact blade is in a toggled closed position or a switch-open position, whether the contact blade is aligned with the clip assembly, the contact blade depth in the clip assembly, etc. The monitoring system is preferably provided with a remote terminal unit delivering sensor data to a remote operating facility.

Abstract: A gang-operated multi-pole switch is provided including an operating handle suitable for manual operation via a hookstick and including an open-position retention arrangement. The open-position retention arrangement includes a first member movable with the operating handle which coacts with a second member. In a preferred arrangement, the first member extends radially from the operating shaft of the operating handle and the second member is a spring plate including a retention surface and disposed in the path of the first member.

Abstract: An apparatus used in combination with a motor operator and an overhead distribution gang switch. The motor operator is activatable for automatically opening and closing the gang switch. The locking assembly includes a coupler assembly that couples the motor operator with the gang switch. A clutch plate and operating handle connecting device is hinged to the coupler assembly for selectively connecting and disconnecting the motor operator with the gang switch, and for manually opening and closing the gang switch when the motor operator and the gang switch are disconnected. An assembly is provided for locking the coupler assembly in a coupled mode. A locking device is engageable with the connecting device when the motor operator and the gang switch are disconnected. The locking device locks the connecting device in a first position in which the gang switch is opened, and locks the connecting device in a second position in which the gang switch is closed.

Abstract: An insulating assembly for an overhead power line has a main subassembly formed of two parallel spaced insulators joined at their ends by aluminum end pieces. The end pieces each have a slot aligned with the space between the two insulators and a rod projecting from the end piece in alignment with the slot but below the slot. This arrangement enables the subassembly to be hung on a hot power line with the line passing along the slots and the space between the insulators. The rods may be clamped to the line by any suitable device such as wedges and C-shaped clamps. With the subassembly thus mechanically and electrically connected securely to the line, the line can be severed at a location between the end pieces and the free ends forced apart.

Abstract: The apparatus includes contact blades at different elevations on a utility pole rotatable between electrical connection and disconnection positions vis-a-vis contact members. To rotate the contact blades, an electromechanical linear actuator extends a clevis and crank arm to rotate a vertically extending shaft coupled to another crank and a lever arm to rotate the insulators on which the contact blades are mounted. The linear actuators are carried by support structure high on the utility pole and, by rotating the vertical shafts, the insulators and contact blades at each phase are simultaneously rotated.

Abstract: Disclosed is a switching device for a tap changer comprising an input lever and an output lever rotatably attached to a shaft. The output lever is provided for making contact with a selected one of a first tap and a second tap. The output lever has a cammed surface at its base for securing a position of the output lever to make contact with the first tap and for preventing the output lever from rotating about the shaft. The device also includes a spring for pulling the output lever toward the input lever, and a clutch, rotatably attached to the shaft, which has a slot. A latching apparatus engages the clutch. The device further includes a pin which is fixedly attached to the input lever and disposed within the slot. The pin drives the clutch to engage the latching apparatus. In operation, after the input lever has been pulled away from the output lever by a predetermined angle, the pin drives the clutch to engage the latching apparatus, thereby freeing the cammed surface from the latching apparatus.

Abstract: A group operated switching apparatus for overhead electric power lines has a box-like elongated housing which mounts on a pole and supports three disconnect switches. Three operating shafts are journalled on the housing and are operatively connected to the disconnect switches so that axial rotation of the operating shafts alternately opens and closes the disconnect switches. An upright control shaft extends through the housing. A transverse rod assembly is enclosed within the housing and defines a mechanical connection between the control shaft and the operating shafts so that axial rotation of the control shaft causes axial rotation of the operating shafts. Each disconnect switch includes a jaw terminal having dual function backup springs and auxiliary contacts for minimizing effects of arcing during opening and closing of the switch.

Abstract: A resistance-provided UHV breaker includes a tank, a main contact unit, a resistance unit, and a resistance contact unit. The main contact unit includes plural main contacts arranged in the axial direction of the tank. The resistance unit includes plural resistances arranged in the axial direction of the tank. The resistance contact unit cooperates with the resistance unit to form a resistant parallel circuit and it is arranged, crossing the axial direction of the tank. The main and resistance contact units are opened and closed by an operating mechanism arranged outside the tank.

Abstract: A high voltage section switch of the type includes a female current terminal situated at one end of a first vertical insulating column, a control blade which is hinged at one end of a second vertical insulating column and which carries at its first end a male contact intended to co-operate with the female contact, movement of the blade being provided by a mechanism connected to a rocking insulating column. The hinge between the blade and the second column is provided by means of two levers of different lengths.

Abstract: A perpendicularly-opening grounding section switch comprising a female contact and a male contact disposed at the end of the drive rod includes two parallel metal horns disposed in such a manner as to clamp against the end of the arm in the vicinity of the male contact when the section switch is in the closed position, and a flexible metal rod or whip which is constrained to slide along a fixed point of a guide piece while the arm is performing an opening operation, the respective lengths of the horns and of the whip being selected so that current is switched first to the horns and then to the whip during an opening operation.

Abstract: A whip usable in a high tension section switch, in particular a vertically-opening switch, the whip comprising a flexible metal rod whose section is a truncated circle whose area diminishes progressively from the base of the whip to its tip.

Abstract: A section switch of the type has a blade connected at a first end to a first connector. The blade is enabled during an opening stage, firstly to rotate about its own axis and secondly to pivot about a transverse axis. The blade includes at a second end, a contact hammer for co-operating with jaws connected to a second connector. The section switch also includes a mechanism such that during an opening operation, once the blade has rotated about its own axis with disconnection of the hammer electrically from the jaws, electricity is initially diverted through and is subsequently switched by an interrupter switch. The interrupter switch opens under the control of a sudden break drive mechanism controlled by the displacement of the blade. The section switch includes two horns between which a sacrificial hammer moves with friction.

Abstract: A power receiving and transforming system comprising a gas insulated switchgear, with transformers being disposed adjacent the gas insulated switchgear and metal enclosed switchgear sections disposed on opposite sides of the transformers with respect to the gas insulated switchgear. The metal enclosed switchgear sections have metal enclosed switchgear units juxtaposed in a direction in which the gas insulated switchgear and the transformers are juxtaposed. The metal enclosed sections are located opposite to each other in a direction perpendicular to the direction of the juxtaposition. Therefore, the metal enclosed switchgear sections can be arranged so as to have a width equal to a width of the gas insulated switchgear and the width will not change even if the number of feeders in the metal enclosed switchgear sections is increased thereby enabling the entire power receiving and transforming system to be regularly installed at a site.

Abstract: The invention is an apparatus for connecting and disconnecting an unenergized electrical line relative to an energized electrical line. It includes first and second connector devices, each including an electrically non-conductive member having a manipulatable hook positioned at one end. A fuse is electrically connected between the first and second connector hooks for electrically disconnecting the first connector hook from the second connector hook in the event of an excessive current demand through the connector hooks. A remotely operable switch is eletrically connected between the first and second connector hooks for electrically connecting and disconnecting the first connector hook relative to the second connector hook.

Abstract: A multi-pole group-operated switch is provided for electrical power distribution circuits. The switch is self-contained and suited for ease of use with various line spacings and arrangements of the distribution lines; e.g., side-by-side (horizontal plane), phase-over-phase, and cable drops. The switch includes a plurality of switch-pole units carried at desired spacings by a base support and drive arrangement. Each of the switch-pole units includes a housing, interrupting contacts, and disconnect contacts. The housing that encloses the interrupting contacts in movable to perform the disconnect function. The base support and drive arrangement encloses a high-speed interrupting linkage for operation of the interrupting contacts of each of the switch-pole units and carries an operating mechanism that is connected to the interrupting linkage internal to a base support member of the base support and drive arrangement. The switch also includes a disconnect linkage to move the switch-pole housings.

Abstract: Compact electrical power disconnect switch modularized to provide very broad current rating and comprising reverse-loop fingers which cooperate in pairs and form flexible spring-loaded contact members. An enlongated rotatable contact member is positioned between the reverse-loop fingers and makes and breaks electrical contact with same upon being rotated. Operation is fast and positive and three-phase power can readily be accommodated. A viewing window can be provided for a rapid check of the position of the switch.

Abstract: A pressure or draw bar of fiber-reinforced insulating material, in particular for a high voltage circuit breaker. The pressure or draw bars of fiber-reinforced insulating material are provided with connecting elements for the introduction of force for operating the circuit breaker. The connecting apertures of the draw bar which allow connection to the circuit breaker should be simple to adjust and secure, but should be fixable in a manner which permits ready detachment. The connecting apertures of the connecting elements are arranged in a fork part, to which a slit pipe part with external threads lies adjacent. In the slit pipe part a spreading body is arranged held by a screw, which in the region of the fork part has a surface accessible for generating a rotational motion. The spreading body can thus by spreading apart the slit pipe part determine the height of the connecting apertures with respect to the bar. The fitting body is surrounded on the outside by a ring as screening.

Abstract: A gas-insulated switchgear forming a bus section unit used in substations. In a double bus scheme where non-segregated 3-phase gas-insulated buses are laid on a horizontal installation area, this invention applies to a bus structure in which sectionalized gas-insulated main buses arranged in line on the same axis are connected by the bus section unit. By the side of the sectionalized gas-insulated main buses are installed bus section circuit breakers for three phases. A shifted bus section leading from one of the sectionalized main buses is disposed above the third gas-insulated main bus which is located farther from the circuit breaker. The shifted bus section is used to connect the sectionalized main buses. This structure improves the seismic resistance of the bus section unit without increasing the installation area of the unit.

Abstract: A method and apparatus for isolating electric power lines includes an insulator assembly to which is pivotally connected two line clamps. After the clamps clamp to the wire, the wire is cut so that the insulator isolates the line. In one form the clamping surfaces are curved in the longitudinal direction to make up for the loss of line length due to the elongation of the assembly under line tension. Cut-out assemblies for fuse and disconnect purposes are readily applied to the assembly by a lineman standing on the ground below.

Abstract: A spark gap switch is disclosed with a pumping system which utilizes flowing gas to replenish the interelectrode region between conductive pulses. The spark gap switch typically consists of a housing enclosing a gas filled chamber in which there are two end electrodes with an intervening trigger plane electrode that may be inserted at other than midplane. To initiate switch closure, a trigger pulse is applied between one end electrode and a trigger plane electrode causing the gas in the intervening gap to ionize and conduct and thereby bring on complete switch closure. To achieve proper gas flow each end electrode is configured as a truncated cone and gas is caused to flow from a multiplicity of ports spaced equidistantly around each cone base. The gas ascends the conical outer surface of each end electrode, sweeps over the crown and exhausts out through an opening in the center of each electrode.

Abstract: An arrangement for efficiently assembling and providing a plurality of circuit protection device configurations by use of major components that are common to the configurations and that are adapted for interconnection and functioning with each other; some of the major components providing different or multiple functions in the various configurations. The various configurations satisfy the application requirements and customer needs with regard to voltage rating, efficient space usage, station layouts, and the provision of disconnect mechanisms. The configurations include various orientations of interrupting units and the provision of various types of disconnect mechanisms. The major components include an operator, an interrupting unit, an insulating support column, and a base drive. The operator provides a first drive output and a second drive output. The insulating support column is capable of being rotated to provide a rotary drive output for disconnect mechanisms.

Abstract: A switchgear assembly for an electrical apparatus capable of improving operability thereof to a practical extent, as well as reducing not only installation area or space for various devices to be disposed below the switchgear but also the weight of the switchgear itself. The switchgear assembly such as a disconnecting switch assembly, fuse assembly or the like is interposed between a bus bar supported through a first support insulator on the top end of a vertical pole, and an electrical apparatus connected to the bus bar. The disconnecting switch assembly or fuse assembly comprises a movable contact pivoted at its one (lower) end to a pole mounted second support insulator for rotary motion in a vertical plane and engageable at the other (upper) end directly with the bus bar or with a fixed contact or fuse retainer supported on the bus bar by a fastening member. The other (upper) end of the movable contact or fuse is fastened to the bus bar completely independent of the pole.

Abstract: Disclosed is a gas-insulated switchgear in which three circuit breakers are arranged in tandem between a pair of main bus bars spaced apart by a predetermined distance. The connection between the three circuit breakers is such that adjacent circuit breakers are connected by a connecting bus bar to their lead-out parts remoter from each other, and disconnecting switches, etc. are disposed on the connecting bus bars. This arrangement shortens the distance between the adjacent circuit breakers, so that the gas-insulated switchgear can be shortened in the length in the tandem direction of the circuit breakers.

Abstract: A new and improved apparatus is provided to permit a live or hot electrical power line to be cut in the field for line service or other purposes. The apparatus is connected at each end to the line at positions spanning the site of the cut. The attached end portions are then moved closer to each other, easing the tension on the portion of the line to be cut. The apparatus is then connected to the live line with jumper cables, forming a parallel electric circuit. The line is then cut and a cut end tied back. Flow of current through the apparatus is broken. An interrupter in the apparatus suppresses any arc which may tend to form.

Abstract: A group operated electric circuit disconnect apparatus for a plurality of overhead electric power distribution lines carried on poles. The apparatus includes an elongated extruded base mounted on and extending transversely of a pole. A bracket is connected to an electric circuit component. The elongated base has at least one elongated slot with a reduced dimensioned entry. The bracket is positioned and secured at any position along the base by fasteners having enlarged head portions mating within the slot.

Abstract: An insulating support column is provided for driving interrupting units and includes an insulator having a longitudinal bore extending therethrough, a translational operating member extending through and outside of both ends of the insulator, and sealing arrangements between the operating member and the insulator to retain insulating material within the insulator and to seal the bore from the external environment. The insulating support column is disposed substantially vertically during operation to drive the interrupting unit. The operating member includes a first portion of insulative material and metallic portions that are affixed at each end of the first portion. The lower metallic end portion of the operating member includes a connector that is driven by a power train and the upper metallic end portion includes a connector that is connected to drive an interrupting unit. An end fitting is affixed to each end of the insulator.

Abstract: A three-phase isolating disconnector for use in a high-voltage switchgear arrangement in two gas-filled chambers, separated by a wall, in said arrangement, comprising for each phase a disconnector member extending through the wall and fastened and movable therein, this disconnector member being provided with a disconnector contact in each chamber, and comprising two fixed counter disconnector contacts which are connected to other parts of the switchgear arrangement and of which one is disposed in one chamber and the other in the other chamber. The movable disconnector member is brought by rotation from a first position, in which it conductively connects together the two fixed counter disconnector contacts, to a second position in which the conductive connection is broken and in which at least one disconnector contact of the movable disconnector member is connected to an earth contact, and vice versa.

Abstract: An arrangement including an insulative support column provides independent rotary and linear drive outputs for the operation of electrical switches, circuit interrupters and/or disconnects or the like. A first, linear drive linkage provides translating motion at a first output in response to linear translating motion at a first input. The linear drive arrangement is provided by an elongated, insulative operating member that is disposed within an elongated bore of the insulative support column, with the operating member extending through the top and bottom ends of the column. A second, rotary drive output is provided by rotation of the support column. The column fixedly carries a lower base member which is rotatably supported within a base housing. The operating member extends through and exits the base member and cooperates with a bearing carried by the base member. The lower end of the operating member is coupled to the linear drive linkage input.

Abstract: A high-voltage switch having a housing supported on a pin insulator and two movable switching pieces mounted in the housing. The movable switch pieces of the switch are coupled via actuating parts to a drive transmission element, a crankshaft, for example, which is guided through the pin insulator to a drive mechanism. The drive mechanism includes the crankshaft which is rotated by one crank whose movement is controlled by another crank. The movable switch pieces are very heavy and must be moved back and forth between ON and OFF switch positions. The drive mechanism provides two precisely located stable positions corresponding to the ON and OFF switch conditions and the heavy switch components are moved such that their motion is damped as they approach one or the other stable position whereby the need for additional damping means for arresting the movement of the switch is avoided. The switch is suitable as a multi-phase generator switch having several switch poles.

Abstract: A power switch assembly has a horizontal supporting base, a circuit disconnector including a first supporting porcelain insulator vertically disposed on the supporting base, a stationary contactor supported by the free end of the first insulator, and a rod-shaped movable contactor separably engaged by the stationary contactor and pivotally secured to an operating mechanism located within a hollow terminal disposed at the free end of a second supporting porcelain insulator vertically disposed on the supporting base, and a circuit breaker disposed on the hollow terminal to be tilted to be remote from the movable contactor, while two driving rods extend through the second insulator and are connected to the driving source to open and close the circuit disconnector through the operating mechanism and the circuit breaker through a linkage located within the hollow terminal. The power switch assembly may have further a porcelain clad lightning arrester substituted for the first insulator.

Abstract: A movable high amperage electrical switching buggy which is adapted for use in a corrosive atmosphere includes a wheeled chassis and spaced apart first and second electrical terminals housed on the chassis and extending therefrom. First and second electrical conductors are positioned within the housing and communicate with the first and second terminals respectively. At least one high amperage electrical switch is housed on the chassis with respective terminals of the switch being in electrical contact with the respective electrical conductors. The switch includes a first switch terminal including a piston chamber and a movable piston contact member housed therein and a second switch terminal. An insulating member is secured between the first switch terminal and the second switch terminal to prevent electrical contact therebetween unless the piston is in contact with the second terminal.

Abstract: A supporting insulator (9) to support the driving mechanism (6) of a disconnect switch part (100) and a supporting insulator (9) of a breaker (10) are unified. The heights of the fixed contact (4) and the driving mechanism (6) of the disconnect switch part (100) as well as the height of the upper end of the common supporting insulator (9) supporting the breaker (10) are substantially the same. Setting area is thus decreased, while ensuring a high spatial insulation distance.

Abstract: In a compressed gas insulated high voltage switching installation, in particular, one with single phase metallic encapsulation, including bus bar systems and switchgear sections, with branches which are firmly anchored in space and in which compensators with tie rods are arranged in line with the bus bar systems, the longitudinal expansion of the housings of the bus bar systems is taken up practically free of stress without large cost, by subdividing each phase of the bus bar systems into sections preferably lying along two parallel longitudinal axes. Double-T-shaped connecting housings, firmly anchored in space, are arranged between adjacent sections of the same phase and, at least at one end of each section, a compensator is arranged on both sides of the connecting housing. Tie rods, starting from the outer flanges of the compensators, bridge the compensators and the connecting housing.

Abstract: A high voltage isolator switch of the double end break type including a central, rotatable insulator carrying a switch blade and a pair of opposed insulators bearing contact assemblies for engaging the ends of the blade. The contact assemblies include pivoted saddles mounted on cantilevered studs and detents to hold the assemblies in an open position.

Abstract: The pivotal switching arm of a "swivel post" type load break switch carries, in addition to a blade contact, a U-shaped sliding block type conducting driver which has an elongated elastically expandable slot that engages the ratchet head of the rectilinearly movable switch pin of a current quenching device mounted on the fixed contact post. To control the spring constant of the slot, an enlarged opening is provided at one end of the slot which reduces the cross-section of the driver. At the other end of the slot, an enlargement serves to release the ratchet head when the switch opens. The driver enables rectilinear quenching devices to be used in conjunction with the curvilinear motion of the switching arm.

Abstract: A switch for high voltages comprising co-operating fixed and movable spherical contacts, of which the or each fixed contact consists of a stationary body in the shape of a hollow spherical cap and a potential field controlling screen adapted to be forced by the respective movable contact into said hollow cap, said screen being spherically complementary to said spherical cap, when the switch is in its open condition, and being also provided with the contact surfaces to conduct the main current.

Abstract: Apparatus for preventing two switches from being simultaneously closed. A pair of rollers are each movable in, and between the ends of, respective curved tracks. The rollers are each linked to a respective switch so that when its switch is closed, each roller is at the bottom of its track, and when its switch is open, each roller is at the top of its track. Each switch cannot operate if its roller cannot move. A yoke maintains the rollers a fixed distance apart so that each roller may be at the top of its track, one roller may be at the top of its track while the other roller is at the bottom of its track, and vice versa, but one roller cannot move away from the top of its track if the other roller is not at the top of its track and vice versa. If one switch attempts to close while the other switch is closed, the roller of the closed switch is pulled into a detent at the bottom of its track; the roller remains in the detent as long as the other switch attempts closure.

Abstract: An improved bearing and journal construction is provided for a high-voltage disconnecting switch of the type having supporting insulators and a rotatable crank-arm arrangement, with the operating thrust of the crank-arm being supported by simplified bearing discs running in a journal, the improvement residing in the fact that the hinge member about which the switch-blade pivots is separate from the journal member which bridges the hinge supporting insulator to the rotating insulator, and that the foregoing separation allows the journal member to be stamped out of plate material resulting in considerable economy over the cast construction known to prior art. A preferred bearing arrangement locates the discs under the crank-arm so that traditional machining of a bearing race on the crank-arm is eliminated for further economy.

Abstract: A telescoping isolated phase bus disconnect switch includes a cylindrical outer housing at ground potential, a pair of coaxial fixed inner conductors at high potential, and a telescoping coaxial movable inner conductor bridging the two fixed inner conductors to perform a switching function. The movable inner conductor is supported on insulating means extending through the housing and mounted upon a movable carriage outside of the housing. The carriage is operated by a drive motor and mechanical linkage both located outside of the housing. The mechanical linkage produces a variable mechanical advantage, increasing its mechanical advantage over the movement range of the switch as the required closing force increases.

Abstract: Apparatus for selectively connecting and disconnecting two sets (1, 2) of three-phase busbars via isolating switch means, said sets of busbars being covered by metal cladding (31, 32), and extending in two different directions in a common plane (40) such that the center-lines of the two sets intersect, wherein the point of intersection is located within a metal sphere (41) having sleeve joints (41, 42) to which the cladding (31, 32) of the busbars is fixed, with the axes of the sleeve joints lying in said common plane (40) and wherein where they pass through the sphere, the busbars of one of the sets occupy a first plane parallel to said common plane and wherein the busbars of the other set occupy a second plane parallel to said common plane and on the other side thereof relative to said first plane, said isolating switch means being provided with contact rods (51) to connect corresponding bars of different sets together, said contact rods (51) lying in a plane which is perpendicular to said first and second

Abstract: A shielding arrangement for preventing the buildup of ice on the contacts of an outdoor high-voltage switch structure. The shield includes one or more flexible members which overlie the contacts and are in the path of the travel of a switch element.

Abstract: A telescoping high current disconnect switch for isolated phase bus includes a pair of axially spaced cylindrical fixed conductors insulatingly mounted within a cylindrical aluminum housing. An aluminum telescope section is coaxial with the fixed conductors and is insulatingly mounted upon a plurality of rollway pillow blocks each containing ball bearings. The pillow blocks are supported by guide rails of austenitic non-ferromagnetic stainless steel which are attached to the interior surface of the housing. The telescope section is axially movable along the guide rails to bridge the fixed conductors, such movement causing the ball bearings to cold-form grooves in the rails, whereby portions of the rails are work-hardened.

Abstract: A disconnecting switch arrangement for a high voltage disconnecting switch equipped with an earthing device for use particularly in a metal clad insulated substation. The arrangement comprising a disconnecting unit, an earthing unit and an actuating unit for actuating the disconnecting unit and the earthing unit. The disconnecting unit comprises a stationary contact member, a common stationary contact member at a standard spacing from the stationary contact member and a common movable contact member for disconnecting from and connecting with the stationary contact member and the common stationary contact member and is moved in a circular motion by the actuating unit. The earthing unit is comprised by an earthing contact member, the common stationary contact member and the common movable contact member each of which is commonly used with the disconnecting unit.

Abstract: An indicator is disclosed for a high voltage circuit interrupter having a stored-energy mechanism for biasing the contacts open.The interrupter has a shunt trip mechanism to open the contacts in response to either circuit conditions or a remote command, and a manual mechanism to trip the store-energy mechanism and to recharge and reset the store-energy mechanism. The indicator mimics the operation of the circuit interrupter and provide three signals indicating that the contacts are closed and the manual mechanism are between home and trip position, that the contacts open and the manual mechanism is either in the home or trip position, and that the contacts are open and the manual mechanism is between the trip and reset position or at the reset position. The indicators are preferably two lights with either light on or with both lights out.

Abstract: Improvements in a quick-break attachment, for a pole-top air-break switch, wherein said attachment is of the type including a whip engaged in a catch to maintain a protective, anti-arcing shunt across the switch until the latter opens, whereupon the whip disengages and quick-breaks from the catch; the improvements consisting of instrumentalities which, firstly, assure of substantial acceleration in speed of the whip after its disengagement but before actual electrical separation occurs, and, secondly, prevent rebound of the disengaged whip into arcing contact with the catch.

Abstract: A gas insulated switch-gear apparatus having first and second base planes is disclosed. Arranged on the first and second base planes are feeder switching apparatus comprising gas filled circuit breakers and first and second gas insulated disconnecting switches at opposite sides of each of the gas filled circuit breakers. Gas insulated busbar devices are arranged to be horizontally spaced from the feeder switching apparatus. On the first and second base planes, the first gas insulated disconnecting switches are connected to the gas insulated busbar devices while the second gas insulated disconnecting switches are connected to bushings. Axial lines of the feeder switching apparatus along which the first and second gas insulated disconnecting switches are arranged traverse axial lines of the gas insulated busbar devices. The axial lines of the gas insulated busbar devices arranged on the first and second base planes lie in a common vertical plane containing the axial lines and lie in the base planes.

Abstract: An isolated phase bus disconnect switch has a cylindrical center conductor coaxially disposed in a cylindrical conductive housing having an access port. The edges of the port which are perpendicular to the housing have a conductive gasket of tinned copper braid bolted thereto. A curved conductive cover has a rubber gasket attached to its edges. The cover is removably secured to the housing by a plurality of hold-down hinges attached to the housing which supply sufficient pressure to the cover to seal the rubber gasket and produce electrical contact between the cover and the housing. The electrical path from housing to gasket to cover to gasket to housing eliminates the electrical discontinuity caused by the access port, thus preventing destructive electrodynamic forces between the center conductor and the housing.

Abstract: A telescoping disconnect switch for isolated phase bus has a cylindrical movable conductor having a plurality of individual contact assemblies each comprising a contact finger and an axially loaded spring fixedly attached thereto. The contact assemblies are circumferentially arranged about the movable conductor and are removably secured between a contact holder ring and a spring retainer ring. A plurality of stabilizer pads are symmetrically arranged around the circumference of the movable conductor between the contact fingers and are fixedly secured to the movable conductor to stabilize the contact assemblies and align the conductor as it moves to open and close the circuit.

Abstract: An isolated phase bus disconnect switch has a cylindrical aluminum center conductor coaxially disposed within a cylindrical aluminum housing. The center conductor is composed of two fixed axially spaced sections and a coaxial telescoping sleeve assembly which moves axially to make and break electrical contact between the fixed sections. One end of each fixed section and both ends of the sleeve assembly have copper contact rings fixedly attached thereto. Adjoining surfaces of the copper-aluminum interfaces are silver plated, and each of the adjoining aluminum members is axially slotted to permit flexing to allow for differential thermal expansion, while at the same time preventing relative motion between the plated surfaces.