Abstract: A main circuit portions are arranged in the order of a breaking section fixed-side conductor, a breaking section movable-side conductor, a disconnecting section movable-side conductor, and a disconnecting section fixed-side conductor, and first and second grounding conductors are respectively provided for grounding the breaking section fixed-side conductor and the disconnecting section fixed-side conductor at both end portions of the apparatus. The arrangement of operating devices is set in the order of a first grounding-section operating device, a breaking-section operating device, a disconnecting-section operating device, and a second grounding-section operating device. In addition, a breaking section is supported by a single supporting insulator to reduce the number of creepage insulation portions.

Abstract: A stored-energy mechanism for a high-voltage circuit-breaker pole filled with an insulating gas with a drive rod, which transmits the drive movement to an interrupter unit by thrust or traction and which can be driven through a drive crank attached to a drive shaft, and with an opening spring coupled to an opening crank attached to the drive shaft and with a closing spring driving a closing crank attached to the drive shaft. It is provided that the closing crank and the opening crank are arranged outside the insulating gas chamber. The drive crank is arranged inside the insulating gas chamber, a carrier block seals the chamber filled with insulating gas against the outer chamber, the drive shaft traverses a housing wall of the carries block in a gas-tight manner, and the carrier block forms an end support for the closing spring and the opening spring.

Abstract: An improved gas insulation type load break system, which is capable of more easily discharging remaining current of a cable to which the power supply is disconnected, and enabling an easier cable connection test after the cable connection work is finished, which includes a switch main body, the switch main body being made of a single container; an operation handles mounted on a front panel of the switch main body for controlling opening/closing state and earthing state of a current applied thereto; a main circuit bushing mounted on a front panel of the switch main body for forming an opening/closing path of a current; an earthing bushing mounted at one side of the main circuit bushing for forming an earthing path; a current supply fixed contact point connected to the main circuit bushing, through which a current is applied to the interior of the switch main body; an earthing fixed contact point connected to the earthing bushing for discharging a current applied to the interior of the switch main body; a main

Abstract: This power circuit-breaker has at least one cylindrically constructed arcing chamber which is provided with a stationary contact, with a moving contact and with a quenching zone between the two contacts. A shaft of the moving contact is permanently connected to a blowout volume which is closed off on the stationary contact side by an insulating nozzle through which at least one flow channel passes. The arcing chamber has a first compression volume which is operatively connected to the blowout volume and to a second compression volume. It is intended to provide a power circuit-breaker in which the blowing-out of the arc with pure SF.sub.6 gas is made stronger. This is achieved by providing a moving auxiliary piston between the first compression volume and the second compression volume and by the auxiliary piston being connected to the moving contact via a direction-changing device.

Abstract: A circuit-breaker including main contacts and arcing contacts includes a shaft carrying a first lever connected to the moving main contact. A hub is mounted inside the shaft and carries a second lever connected to the moving arcing contact; the shaft and the hub being shaped over a certain portion into two sectors between which a spring is disposed. A single control causes the shaft to rotate so that the shaft firstly causes the hub to rotate via the spring, the shaft and the hub rotating respectively causing the moving main contact and the moving arcing contact to move, and the shaft secondly rotates to a further extent, with the hub being prevented from rotating by action from an abutment. This arrangement makes it possible to implement a simple synchronization of the main contacts opening before the arcing contacts.

Abstract: An apparatus for operating a combined interrupter disconnect switch is disclosed. The disconnect switch is operated by a slow speed linear motion of a mechanism pullrod. The interrupter, which is a component of the disconnect switch arm, is operated by a high speed linear motion of the same mechanism pullrod. In a preferred embodiment, the apparatus of the present invention comprises: an operating rod; a high speed operating mechanism connected to the operating rod; a sliding gear having an elongated gear face; a motor, rotatably connected to the sliding gear; a coupling gear drive having a longitudinally disposed threaded shaft and an external gear face, connected to the operating rod and meshed with said sliding gear; a threaded rod threaded into the threaded shaft of the coupling gear drive; and a drive rod connected to the threaded rod and to the mechanism pullrod. The high speed operating mechanism and motor respectively provide high speed and slow speed linear motion to the mechanism pullrod.

Abstract: The present invention provides a clutch-coupled crossarm mounted switch operator. The switch operator of the invention includes rotational motor means, a non-positive contact or infinite engagement clutch mechanism, and an output coupling. The rotational motor means further includes an input shaft to which the clutch mechanism is coupled. The infinite engagement clutch mechanism does not depend on rotational alignment means for engagement of the clutch. The clutch further includes an output shaft to which the output coupling is coupled. The output coupling is in turn coupled to a gang operated switch element that causes the switch contacts of the gang operated switch to open and close. Use of the clutch coupled switch operator thus effects the opening and closing of the gang operated switch contacts. Further, disengagement of the clutch mechanism allows the user to exercise and test the rotational motor means without displacing the contacts of the gang operated overhead high voltage air switch.

Abstract: The isolating switch (1) contains an isolating switch housing (2) and at least two switching points (18, 19, 20) which are arranged in the isolating switch housing (2), are of axially symmetrical design, and each have one fixed switching element (7, 8, 9) and one switching element (15, 16, 17) which can move along the switching point axis (21, 22, 23). A drive shaft (11) leads into the isolating switch housing (2). From this drive shaft (11), power is transmitted via a gearbox (25) to the movable switching element (15, 16, 17). The gearbox (25) has for each switching point (18, 19, 20) a control cam (26, 27, 28) which is fixedly connected to the movable switching element (15, 16, 17), is aligned transversely with respect to the shaft axis (11) and is displaceable. It also contains a lever (29, . . . 34; 47) which is attached to the drive shaft (11) and interacts with the control cam (26, 27, 28).

Abstract: For the purpose of providing a gas circuit breaker with a structure of hydraulic pressure operation system capable of detecting the occurrence of an incomplete closed state of the valves therein to prevent their erroneous motion during the subsequent motion, and a liquid-pressure driving system to be used therefor, a check valve is arranged so as to suppress the flow into the space on the side of the downstream of a closed-circuit operation spool valve, wherein the space on the side of the downstream of the closed-circuit operation spool valve is connected through a second diaphragm to a low-pressure oil tank and the operation time or operation number of a liquid-pressure pump is measured.

Abstract: This present invention concerns a circuit-breaker of the self-blasting type including a system for immobilizing the semi-mobile piston during a first part of displacement of the mobile contact assembly between the closed position and the open position and for displacing the piston axially during a second portion of the same displacement of the mobile contact assembly. This system includes at least one first longitudinal slot and at least one second longitudinal slot on the fixed tube, a freely rotatable locking tube carried by the fixed tube, aligned with the slots thereof and including at least one first longitudinal slot and at least one second longitudinal slot, at least one pin carried by the second tube and penetrating the first slot of the fixed tube and the first slot of the locking tube, and at least one pin carried by the piston and penetrating the second slot of the fixed tube and the second slot of the locking tube.

Abstract: A high voltage open-air switch has a movable disconnect switch blade which contains a circuit interrupter therein having interrupter contacts in series with the open air disconnect switch contacts. The circuit interrupter has a lower BIL rating than the switch. An operating mechanism causes the independent operation of the interrupter and disconnect switch such that there is a high speed opening of the interrupter contacts, followed by the low speed opening of the disconnect switch contacts, and a slow speed closing of the disconnect switch contacts followed by the high speed closing of the interrupter contacts. The switch can be adapted to numerous switch configurations and permits substantial savings in space by the reduced mounting space requirements for the interrupter assembly.

Abstract: A circuit-breaker having two interrupting chambers per pole, the chambers being disposed in a T or V configuration at the end of a column provided at its base with a control system for operating a drive rod, each chamber containing a moving assembly connected via a linkage to the drive rod, and main contacts and arcing contacts, wherein each chamber contains a semi-moving assembly including main contacts and arcing contacts co-operating respectively with the main contacts and the arcing contacts of the moving assembly, the semi-moving assembly in each of the chambers including a mechanism for moving it at a velocity of equal magnitude and of opposite direction to the velocity of the moving assembly with which it co-operates.

Abstract: A gas-insulated switch for a distribution transformer and its associated electrical connections are located within a tank containing insulating and cooling oil for the transformer.

Abstract: A gas circuit breaker having a resistance circuit breaking portion connected in parallel with a main circuit breaking portion includes a main circuit breaking portion actuating mechanism and a resistance circuit breaking portion actuating mechanism. The resistance circuit breaking portion actuating mechanism is provided with a first delaying mechanism mechanically coupled to the main circuit breaking portion actuating mechanism, and a second delaying mechanism, independent from the first delaying mechanism, which is operated by an electrical command signal relating to either a making or an interrupting electrical signal to the main circuit breaking portion actuating mechanism. The otherwise possible thermal break-down of a resistor connected in series with the resistance circuit breaking portion is prevented.

Abstract: A bushing assembly is provided that functions as a circuit interrupter for electrical equipment such as a power transformer or the like. The bushing assembly is mounted so as to extend through the housing of the electrical equipment and incorporates a circuit interrupter having separable interrupter contacts. The bushing assembly includes an insulating bushing and electrical connections for connecting the separable interrupting contacts between a power source connection external to the housing and an input connection internal to the housing that supplies the electrical equipment. The circuit interrupter includes a control arrangement for selectively operating the separable interrupting contacts. In one specific arrangement, the control arrangement is responsive to operate the separable interrupting contacts to interrupt the circuit when the current is above a predetermined level.

Abstract: The compressed gas-blast circuit breaker includes two moving contact members (1, 2) which are guided to move counter to one another along an axis (3) in a chamber which is filled with insulating gas. These contact members each have an arcing contact (8, 9) and a main current contact (6, 7). An insulating nozzle (10) mounted on a contact member (1) is moved directly by a drive, and compressed gas is passed, during disconnection, through the constriction (11) in the insulating nozzle (10) into an exhaust space (14) from a pressure space (12), which is independent of the switching travel, and/or from a compression space (19), which is operated by the contact members. Drive force is passed to a contact member (2), which absorbs force, from the directly-driven contact member (1), through an insulating part and a speed converter.

Abstract: A compressed gas-blast circuit breaker including a pump cylinder which is moved along with a movable first contact piece. The pump cylinder surrounds a pumping space and a blast chamber, the latter of which is fluidly connected to a first blast nozzle surrounding the first contact piece. A pump piston is supported on a fixed support part via toggle levers, and a toggle joint of the toggle levers is pivoted to a drive rod via a rocker. At the start of a switch-off stroke, an initial bent position of the toggle lever is lessened, intensified after the straightened position has been passed, then lessened again and intensified again after the straightened position has been passed once more. The oscillation of the toggle lever about the straightened position permits the pump piston to be virtually stationary, while an intermediate bottom, which separates the pumping space from the blast chamber, approaches the pump piston in order to reduce the pumping volume.

Abstract: A high-voltage circuit breaker has a metallic housing. The contact member assembly is held by insulating supports, and has a fixed contact member and a movable contact member. The movable contact member is capable of being driven via an operating lever by means of a drive rod. The drive rod extends through one of the insulating supports. To seal the insulating support from hot quenching gases when the switch is actuated, an insulating disk sealingly surrounds the drive rod and is float-mounted on the insulating support. This allows for compensation of radial movements of the drive rod.

Abstract: The invention relates to a high tension circuit breaker capable of interrupting alternating fault currents which have a pseudo period T. The faults occur at an instant t.sub.0 and delay the zero crossing of the current after a maximum time lapse of t.sub.zmax -t.sub.0. The circuit breaker includes a plurality of interrupting chambers in series. These chambers open at an instant t.sub.1 which is subsequent to the fault instant t.sub.0 and include moving equipment and an arc blaster. The arc blaster operates between instant t.sub.1 and instant t.sub.c, where instant t.sub.c is earlier than the instant t.sub.zmax -T. The circuit breaker also includes a feature which causes blasting to be extended to an instant t.sub.2 lying in the range t.sub.zmax -T and t.sub.zmax +T.

Abstract: A switching mechanism for use e.g. in a circuit breaker of an underground electric substation has a movable rod which causes opening and closing of an electrical contact and a hydraulic operating system. The hydraulic operating system uses a hydraulic fluid which has a high flammability temperature or is incombustible. Thus, even if such fluid leaks from the hydraulic operating system, the risk of fire or explosion is minimized. The hydraulic operating system may have a sealed tank for the fluid, preferably with a variable volume expansion chamber. In a further development, the hydraulic operating system and possibly parts of the movable rod, is enclosed in a casing which is sealed and is filled with a gas which does not support combustion therein. Thus, the risk of fire or explosion is further reduced. The casing may have a variable volume expansion chamber.

Abstract: The movable contact of a puffer interrupter contains a movable conductive tubular sleeve which is electrically connected to and is slidably mounted within a hollow conductive adapter which is supported from the end of a bushing insulator. An insulation rod flexibly connects the adapter to the housing. A pair of flexible rods connect the end of the interrupter to the end of the housing. The puffer interrupter is mounted within a dead tank housing.

Abstract: An operating mechanism for a combined interrupter and disconnect switch comprises an operating crank and an interrupter support housing which are separately rotatable about a common pivotal axis. The interrupter switch is part of a disconnect switch arm and is secured to the support housing. The interrupter contacts are operated by a linearly movable rod which has an end connected to a lever extending from the operating crank and is movable thereby. A crank arm connected to said operating crank is connected to and moved by a linearly movable operating shaft. A spring-biased latch lever is pivotally mounted to the interrupter support housing and releasably engages the free end of the crank arm lever so that the housing rotates with the crank for a first portion of the rotation of the crank and closes the disconnect switch. When the disconnect switch closes, the latch releases and the crank rotates relative to the housing to operate the linearly movable rod which operates the interrupter switch.

Abstract: A dead tank high voltage SF.sub.6 circuit breaker has a stationary cylinder SF.sub.6 puffer section, an arc generated SF.sub.6 pressure blast section, a moving arcing contact plug, and a moving open position shield. The contacts are operated by a reduced size operating mechanism which can be used for both 145 kV and 242 kV circuit breakers.

Abstract: A gas insulated circuit breaker includes a closed tank filled with an insulation gas, one pair of separable contacts disposed in the closed tank, a supporting frame supporting the closed tank, an opening spring for performing an opening operation of the pair of contacts, a closing spring for performing a closing operation of the pair of contacts, and an actuating mechanism box accommodating an opening coil which is adapted to receive a circuit opening command for the contacts, a closing coil which is adapted to receive a circuit closing command for the contacts and an actuating mechanism for rendering the opening spring and the closing spring operative in response to an activation of the opening coil and the closing coil. A first spring casing accommodates the opening spring and is secured on the closed tank, and a second spring casing accommodates the closing spring and is secured on the supporting frame.

Abstract: A drive mechanism for a circuit interrupter comprising a crank and lever pivotally interconnected by a resiliently yielding connecting rod assembly. The connecting rod assembly comprises a coil compression spring and first and second links slidably coupled together to compress the coil compression spring. Rotation of the crank in either direction causes the lever to drive the movable contact of the circuit interrupter into and out of engagement with the stationary contact. The coil compression spring is loaded under compression when the movable contact is driven into engagement with the stationary contact, storing and maintaining a mechanical static load on the movable contact for as long as the movable contact is engaged with the stationary contact.

Abstract: A resistor-provided UHV breaker has a tank sealing an insulating gas therein, a main contact unit located in the tank, a resistor unit connected parallel to the main contact unit, a resistor contact unit located in the tank, a main contact making/breaking unit for making and breaking the main contact unit, and a resistor contact making/breaking unit for making and breaking the resistor contact unit. Further, the breaker has a coupling unit for coupling the main contact making/breaking unit with the resistor contact making/breaking unit. The coupling unit drives the main contact making/breaking unit together with the resistor contact making/breaking unit during closing operation of the main contact unit, and drives the main contact making/breaking unit and the resistor contact making/breaking unit, independently, during breaking operation of the main contact unit.