Abstract: A distribution line switchgear control which is particularly suitable for use with recloser switchgear which requires small amounts of power from the control for operation. The control is most usefully powered for continued operation by small amounts of line current provided through a power source current transformer and includes multiple capacitors which are arranged in a cascaded control power supply having a plurality of isolated stages. The line current is precisely monitored through sensing current transformers by the control which causes the recloser to trip, reclose and lockout, as is appropriate to protect the distribution line and distribution electricity. Inhibit circuits prevent the control from issuing a trip signal, unless sufficient energy exists in a trip portion of the cascaded power supply. A variety of volatile timers and counters enable the control to cause the recloser to trip, reclose and lockout.

Abstract: A switch apparatus comprising a switch mechanism including a first contact, and a second contact movable into and out of engagement with the first contact for respectively closing and opening the switch mechanism, an operating rod assembly connected to the second contact for moving the second contact into and out of engagement with the first contact in response to movement of the operating rod assembly, the operating rod assembly including an operating rod having an outer surface, a first end adapted to be connected to a prime mover, and an opposite second end, and a conductive member connected to the second end of the operating rod and to the second contact, the conductive member having a construction for reducing the magnitude of electrical stress adjacent the outer surface and for positioning electrical stress away from the outer surface, and a pressure vessel for enclosing the switch mechanism and the operating rod assembly and surrounding the switch mechanism and the assembly with dielectric gas.

Abstract: A line current to time interpolator circuit senses the magnitude of current in a power distribution line and develops and AC voltage indicative of the current magnitude. The AC voltage is phase shifted multiple times to produce a number of phase shifted replica AC voltages, and the replica voltages are applied to a multiple input absolute value amplifier to develop a DC voltage indicative of the current magnitude. The DC voltage is applied to a ladder voltage comparator which controls the overall resistance of a discharge path coupled to a charged capacitor. The ladder comparator varies the discharge path resistance in inverse relationship to the DC voltage level to vary the discharge time constant of the capacitor. By controlling operation of a circuit interrupter in accordance with the charge level of the capacitor, the interpolator circuit provides a desired inverse time-current response characteristic.

Abstract: A coil winding machine for winding a bar type conductor into a coil. The conductor is withdrawn from a reel by a feeding mechanism and passes through a straightening mechanism which also positions the conductor in both a horizontal plane of reference and a vertical plane of reference which is maintained while the conductor is progressing through the machine. An encoder measures the length of the conductor as it passes by and when the required length is measured the cut-off mechanism is actuated to cut the conductor. The conductor moves a taping assembly that applies insulating tape to both edges of the conductor for insulating adjacent turns from each other in the completed coil. A bending mechanism then bends the leading end of the conductor at an angle to the length of the conductor to form a terminal for the coil. This bent end is then clamped to the mandrel. As the mandrel is rotated it is also moved axially to wind the conductor about it in a helical path to form the coil.

Abstract: An assembly comprising a tap plug having therein an axially fixed nut and including an externally threaded portion threaded into a cable connector lug, a bushing having therein an internally threaded bore, and a stud including an externally threaded first end threaded into the nut, and an externally threaded second end threaded into the bushing bore.

Abstract: Apparatus for opening and closing a switch, which apparatus comprises a lever mounted on a frame for pivotal movement between a first position and a second position, a first spring biasing the lever from the second position to the first position, a cam and follower for effecting pivotal movement of the lever from the first position to the second position against the influence of the first spring, a step on the cam for permitting movement of the lever from the second position to the first position under the influence of the first spring after the lever has moved from the first position to the second position, a member adapted to be connected to the switch and movable between a switch opening position and a switch closing position, which member is movable to the switch closing position in response to movement of the lever from the second position to the first position, a second spring displaceable between extended and contracted conditions, which second spring is extended to the extended condition in response t

Abstract: A transformer core and coil assembly comprising a core including first and second generally vertical, spaced-apart portions, first and second coils respectively wound around the first and second portions of the core, and a clamping structure including a generally horizontally upper member disposed above the core and the coils, a generally horizontal lower member disposed below the core and the coils, and a generally vertical end plate assembly which is disposed adjacent one of the coils, which extends between and is connected to the upper and lower members and which includes a vertically extending end plate having an upper end extending above the upper member, and the end plate assembly also including a vertically extending member having a U-shaped cross section and including a base portion parallel to and spaced from the end plate, and spaced, parallel leg portions extending from the base portion and connected to the end plate.

Abstract: A transformer comprising a tank having side walls, a core including first and second generally vertical portions and upper and lower generally horizontal portions defining a core window, first and second coils respectively wound around the first and second vertical portions, and an I-beam which extends through the core window, which is supported by the side walls of the tank, and which includes an upper flange supporting the upper portion of the core, a lower flange supporting the coils, and a vertical web separating the coils.

Abstract: A switchgear apparatus comprising a row of pressure vessels, a frame including first and second generally horizontal, elongated members rigidified by the row of pressure vessels, an outer housing including a generally horizontal top portion supported by the frame, generally vertical, spaced apart side portions connected to the top portion, and a door which is movable between a lowered, closed position in which the door prevents access to the interior of the housing and a raised, open position in which the door affords access to the interior of the housing, the door including a generally planar first portion connected to the top portion for pivotal movement relative thereto about a generally horizontal axis, the first portion being angularly spaced from the top portion when the door is in the raised position, a mechanism for assisting manual movement of the door from the lowered position to the raised position, and a mechanism for releasably retaining the door in the raised position.

Abstract: A current limiting fuse for a transformer bushing including a glass tubing, an elongate ribbon spirally wound in the tubing, the ribbon including a number of tabs formed integral therewith to space the ribbon inwardly of the walls of the tubing, a terminal stud mounted on one end of the tubing and being electrically connected to the ribbon, a conductive rod connected to the other end of the ribbon and sealed in the other end of the tubing, a granular dielectric material completely filling the tubing, a self-sealing, self-bonding, rubber tape wrapped around the outside of the tubing and a glass reinforced tape wrapped around the outside of the rubber tape.