摘要:
A commutating circuit breaker that works by progressively inserting increasing resistance into a circuit. This is done via physical motion of a shuttle that is linked into the circuit by at least one set of sliding electrical contacts on the shuttle (“shuttle electrodes”) that connect the power through the moving shuttle to a sequence of different resistive paths with increasing resistance; the motion of the shuttle can be either linear or rotary. A feature of the commutating circuit breaker is that at no point are the shuttle electrodes separated from the matching stationary stator electrodes so as to generate a powerful arc, which minimizes damage to the electrodes. Instead, the current is commutated from one resistive path to the next with small enough changes in resistance at each step that arcing can be suppressed. The variable resistance can either be within the moving shuttle, or the shuttle can comprise a commutating shuttle that moves the current over a series of stationary resistors. In either case, a “soft” opening of the circuit can be accomplished, with low switching transients, provided that the maximum step change of resistance is limited until the current is nearly extinguished. Commutating circuit breakers work equally well for DC or AC power.
摘要:
A commutating circuit breaker that progressively inserts increasing resistance into a circuit via physical motion of a shuttle that is linked into the circuit by at least one set of sliding electrical contacts on the shuttle that connect the power through the moving shuttle to a sequence of different resistive paths with increasing resistance; the motion of the shuttle can be either linear or rotary. At no point are the sliding stator electrodes separated from the matching stationary stator electrodes so as to generate a powerful arc, which minimizes damage to the sliding stator electrodes. Instead, the current is commutated from one resistive path to the next with small enough changes in resistance at each step that arcing is suppressed. The variable resistance can either be within the moving shuttle, or the shuttle can comprise a commutating shuttle that moves the current over a series of stationary resistors.
摘要:
A vacuum arc interrupter that includes a vacuum chamber assembly and a pressure chamber assembly. The vacuum chamber assembly includes a vacuum chamber and a first conductor which is structured to be coupled to a circuit. The first conductor is disposed within the vacuum chamber. The pressure chamber assembly has a second conductor structured to be coupled to a ground, a pressure chamber, a gas generation device and a bullet assembly. The pressure chamber assembly disposed adjacent to the vacuum chamber assembly. The gas generation device coupled to, and in fluid communication with the pressure chamber. The bullet assembly is disposed in the pressure chamber and structured to move between a first position, where the bullet assembly is spaced from the first and second conductors, and a second position, where the bullet assembly contacts, and is in electrical communication with, the first and second conductors.
摘要:
The present invention provides a simple, reliable, comprehensive electrical phase and amplitude fault detection and response system. The system includes means for detecting any of various electrical faults, such as impermissibly low voltage levels, impermissibly high voltage levels, phase dropouts, single-phasing, phase reversals, and/or total power loss. Further, the invention provides both fault detection and response customized to the plant equipment, providing power cut-off an appropriate time after a given fault is detected, and preventing premature power restoration when the line power has not been fully returned to normal. The system provides the fault detection and response functions without the need for electrical power of its own, avoiding dependence on line voltage, batteries or back-up generators. This functioning independent of the presence of electrical power is enabled through use of a pneumatic arrangement for interrupting power to plant equipment.
摘要:
A power circuit breaker has a novel trip valve on the pneumatic operating mechanism for reducing air consumption of the breaker pneumatic operating mechanism. The novel trip valve includes the addition of a valve stem extension to the trip valve shaft disposed in a sliding fit with an exhaust port to the trip valve actuating cylinder which together provide for quick elimination of compressed air from the trip valve actuating cylinder at a predetermined time during the operation of the breaker mechanism. Positive positioning of the breaker contact and rapid closing of the trip valve at a predetermined time is effectuated, thereby reducing air consumption while providing a fail-safe air cushion to the driving piston of the pneumatic mechanism to insure positive positioning of the breaker contacts.
摘要:
A circuit breaker operating apparatus comprising an operating piston connected to an operating member for operating a breaking section, holding means for mechanically maintaining the operation-complete state of the operating piston at the time of completion of its operation, spring means for giving a restitutive force to the operating member, and means for releasing an operating medium acting on the operating piston at the time of completion of its operation. The holding means includes a first lever connected to the operating piston and a second lever having an end connected to the first lever and the other end adapted to be locked by lock means. The lock means is so simple as to be arranged at an optimum position.
摘要:
A circuit breaker operating device in which means including a cylinder having a piston connected to the movable contact in the breaking mechanism, a fluid introducing valve for supplying an operating fluid into a main introducing space beneath the piston, and elements for controlling the movement of the fluid introducing valve are disposed within a storage tank containing the operating fluid to eliminate the need for provision of any fluid supply pipe and reduce the pressure loss to a minimum so that the pressure of the operating fluid can be fully effectively utilized for breaking the circuit at a high speed.
摘要:
The break contacts in a tank-type gas-break circuit breaker are disposed in a high-pressure gas chamber formed in a sectionalized state within a tank constituting a low-pressure gas chamber and are coupled via an operating rod of insulative material passing through the low-pressure gas chamber to a piston of a piston mechanism disposed outside of the tank, a driving device operating in response to a tripping command to impart an initial impulsive driving force for opening the break points to the piston.
摘要:
A step-switching arrangement for changing the taps on a transformer winding without interrupting the flow of current from the winding to a load line includes a precontact switch and a current-limiting resistance connected in a series circuit extending from the transformer tap changing contacts to the load line, this circuit being paralleled by a circuit containing a changeover switch and vacuum switch connected in series and also extending from the tap-changing contacts to the load line. A circulating current through the switches and resistance and part of the transformer winding occurs during a change in taps, and this circulating current is interrupted by opening the contacts of the vacuum switch. All of the switches are actuated by hydraulic motors of the linear type, the motors being supplied from hydraulic pumps of the linear type which are operated in synchronism with the tap-changing mechanism so as to obtain the necessary operating sequence for the various switches in changing over from one tap to another.
摘要:
An electrical switching system of the type which includes a main power switching point, an auxiliary switching point connected in parallel with the main switching point through a secondary circuit which includes a series resistance, and a voltageisolating switching point connected in series with the main switching point. Upon application of a switching-on order, current is caused to flow only through the secondary path containing the series-connected auxiliary switching point and resistance, and also the voltage-isolating switching point which is now closed in order to test the condition of the circuit. If the current flow is abnormally high, the auxiliary switching point is opened and the voltage-isolating switching point is reopened. Thus, there is no current flow through the main power switching point during the test period and this main switching point closes to complete the switching-on order only in the event that the current flow in the circuit is normal.