摘要:
A contactor of the high-voltage type utilizing an arc chute and aligned magnetic pole pieces for urging an arc into the chute for quenching. A pair of rigid bus bars extend upon either side of the arc chute assembly, and are projected along the edges of the pole piece to supplement the arc displacement capability of the pole pieces, particularly at higher current values.
摘要:
An inexpensive power supply for an electconic control system or the like which is capable of converting a wide range of applied AC voltages into a regulated output voltage. A thyristor is coupled in series with an input terminal and a threshold device, such as a Zener diode, placed across the input terminals and paralleled by an RC circuit coupled to the thyrisor gate. Another capacitor is coupled to the thyristor cathode. A ramp-like voltage impressed on the thyristor gate effects triggering at a phase angle which varies in accordance with output voltage. The electronic control system outputs a uniform train of pulses which serve to disable a circuit interrupter. Termination or disruption of the pulse train causes the interrupter to open the protected circuit.
摘要:
An improved drawout carriage assembly for the contactor of a high voltage controller. The controller carriage is fabricated from a pair of sheet metal sides, interconnected at their lower edge by formed sheet metal cross members. The upper portions of the sides are comprised of planar sheets of insulating material. A series of insulative cross members are bolted between the opposed faces of the carriage side pieces and locate elements of the contactor mechanism.
摘要:
An electrical circuit is provided for actuating the trip mechanism of a circuit interrupter and includes a current sensor having a pair of output terminals and designed to cooperate with at least one electrical power conductor to sense the amount of current flowing in that conductor. The circuit further includes a circuit neutral terminal. A power supply is provided having input terminals with one of the input terminals being connected to one of the output terminals of the current sensor for receiving the sensed current signal therefrom, the other of the input terminals being connected to the circuit neutral terminal. The power supply produces output power at a first voltage level during a first mode of operation of the electrical circuit and produces output power at a second voltage level during a second mode of operation of the electrical circuit, with the second voltage level being substantially higher than the first voltage level. Circuitry is connected to the circuit neutral terminal and the other of the output terminals of the current sensor for developing a voltage signal proportional to the sensed current signal. Control circuitry is provided responsive to the magnitude of the voltage signal for actuating the trip mechanism of the circuit interrupter when the current flowing in the electrical power conductor exceeds a predetermined level. When said electrical circuit is in said first mode of operation, the control circuit is connected to the power supply for receiving output power at the first voltage level. When the electrical circuit is in the second mode of operation, the control circuit is connected to the power supply circuit for receiving output power at the second voltage level. The control circuit further includes at least one amplifier circuit for amplifying the voltage signal to a desired level. The amplifier circuit includes a gain changing circuit to adjust the level at which the trip mechanism will be actuated. The control circuit further includes a digital timing circuit having a first signal producing circuit responsive to the magnitude of the voltage of the signal received at the input terminal of the timing circuit for producing pulses having a first frequency. The timing circuit further includes a second signal producing circuit responsive to the magnitude of the voltage of the signal received at the input terminal of the timing circuit for producing pulses having a second frequency. A gate circuit is connected to the first and second signal producing circuits for producing output pulses only when receiving pulses from both the first and second signal producing circuits. A counting circuit is connected to the gate circuit for counting the number of the output pulses whenever the magnitude of the voltage at the input terminal exceeds a predetermined level.
摘要:
An improved anti-rebound mechanism for circuit breakers having a blow-off, current-limiting feature is provided. The improvement consists of a ferromagnetic latch which is activated by any massive current surge through the circuit breaker sufficient to cause blow-off current interruption. The latch is caused to be magnetically attracted to, and engage with, a notch on a movable arm of a circuit breaker to maintain the arm in an open position until the circuit breaker is manually reset in a closed position.
摘要:
A permanent magnet rotor configuration which produces four magnetic poles utilizing two sets of symmetrically-disposed permanent magnets. The slots carrying the magnets exhibit a truncated V-shaped configuration, extending from points on the periphery of the rotor to meet the ends of a straight, central portion which lies parallel to a tangent to the rotor shaft. A short magnetic bridge interrupts the center of each slot, the slots being disposed generally symmetrically upon opposite sides of the rotor shaft.
摘要:
An air disconnect switch incorporates a unique arrangement of an ice breaking self-polishing current transfer horn arrangement which transfers the current to a puffer-type interrupter to effect circuit interruption prior to the disconnect switch being fully opened; the puffer-type interrupter is a dielectric insulated device which has its operating mechanism disposed within the dielectric insulating medium so that the system has no fast-moving external parts and provides a direct drive with minimum maintenance of the mechanism parts. The porcelain tube serves both as the interrupter housing and as the mechanism housing.
摘要:
A heating system within a high pressure gas enclosure which includes a heat emission block surrounded by an insulating tube to form a forced flow convection pump; temperature probes within the high pressure gas enclosure are located so that they will not be influenced by the operation of the heaters.
摘要:
An air disconnect switch incorporates a unique arrangement of an ice breaking self-polishing current transfer horn arrangement which transfers the current to a puffer-type interrupter to effect circuit interruption prior to the disconnect switch being fully opened; the puffer-type interrupter is a dielectric insulated device which has its operating mechanism disposed within the dielectric insulating medium so that the system has no fast-moving external parts and provides a direct drive with minimum maintenance of the mechanism parts. The porcelain tube serves both as the interrupter housing and as the mechanism housing.
摘要:
A front panel assembly for an electrical panelboard or the like. An interior trim panel is fastened within the enclosure proper, having holes through which circuit breakers may protrude and having upstanding edge flanges. A panelfront assembly includes a number of rotatable camming latches for engaging the edges of the flanges. The latches are secured in place with threaded screws extending through rabbets which are concealed by the door of the panelfront.