摘要:
A circuit interrupter of the type including an electronic trip unit for overcurrent determination which includes a small-sized iron core current transformer to power the trip unit electronics along with a giant magnetic resistor semiconductor (GMR) to sense the current flow within the protected circuit.
摘要:
The load lugs electrically connecting circuit breakers employing electronic trip units with associated electrical distribution circuits are shaped to provide magnetic flux concentration to Hall effect current sensors within the electronic trip unit circuit. The Hall effect sensor is positioned within the shaped region of the load lug for optimum focus of the magnetic flux within each phase of a multi-phase electrical distribution system.
摘要:
A ground fault protection module is attached to a circuit breaker employing a thermal-magnetic trip unit to separate the circuit breaker contacts upon occurrence of a ground fault. The ground fault module contains a logic circuit and a giant magnetic resistor for detecting the ground fault.
摘要:
An arrangement for connection between motor controller electronic components and silicon controlled rectifiers (SCR) contained within the controller circuit is presented with line and load straps being arranged on the bottom surface of the motor controller compartment at opposite ends thereof. The SCR's are positioned under the compartment on an elongated heat-sink support plate. Intermediate block connectors interconnect the SCR's with the controller line and load straps.
摘要:
A cooling assembly for semiconductor devices in the form of an enclosure including an inlet and outlet with a semiconductor support assembly is presented. The air passage connection with the inlet defines vortex configuration for the rapid transport of compressed air to the semiconductor devices arranged between the enclosure inlet and outlet.
摘要:
A method for assembling a modular current transformer (17) includes providing a first bobbin (40A) having a first aperture (32A) disposed therein and a second bobbin (40B) having a second aperture (32B) disposed therein. The first axial aperture (32A) is aligned with the second axial aperture (32B), and a xontinuous wire (21) is wrapped sround the first bobbin (40A) in a first direction. With the first and second axial apertures (32A, 32B) still aligned, the continuous wire (21) is then wrapped around the second bobbin (40B) in a second direction opposite the first direction. The first bobbin (40A) is then inverted by pivoting the first bobbin (40A) about a flexible tab (33) that connects the first and second bobbins (40A, 40B). A transformer core (22) is then disposed through the first and second axial apertures (32A, 32B). The windings on the first and second bobbins (32A, 32B) form the secondary windings (20A, 20B) for the current transformer (17).
摘要:
A thermal trip unit within a multi-pole circuit breaker includes a bimetal element having an off-set end to provide cam function during the calibration of the bimetal element. A calibration screw is threadingly engaged within the bimetal element and is adjusted at various calibration levels by means of a step motor driver element.
摘要:
An electronic circuit interruption device having a plurality of protection, indication and control options includes a dedicated printed circuit board having electrical connection with operating circuits controlling each of the several options. Electrical connections between the operating circuits and the circuit interruption controller is made through corresponding dedicated resistors. Option selection is obtained by removal of resistors connecting with non-selected circuits on the printed circuit board.
摘要:
A latching system for a circuit breaker is arranged to actuate a trip unit and interrupt circuit current upon occurrence of a short circuit or an overcurrent condition. The latching system employs an armature having a recess formed therein and a cradle having a cradle tip arranged to releasably engage the recess. A thermal magnetic trip unit is depicted within the circuit breaker for the purposes of detecting overcurrent conditions through the electric path. During current transport through the circuit breaker, the current is thermally sensed by means of the bimetal and magnetically sensed by means of the magnet. The armature rotates against the return bias of a compression spring to release the cradle tip from the recess and allow counterclockwise rotation of the contact arm. The rotation of the contact arm causes the separation of the movable and fixed contacts under the urgence of a mechanism spring.
摘要:
A system for monitoring and controlling a welding/brazing operation on a workpiece having two spaced apart materials with a brazing material disposed therebetween. The system includes a welding apparatus having two spaced apart electrodes. A current is applied through the electrodes and the workpiece sufficient to melt the brazing material. A controller controls the brazing operation by controlling the duration of time during which current flows through the workpiece. A non-contact sensor is coupled to the controller and measures the temperature of the brazing material, so that upon a predetermined temperature measured by the sensor, the controller causes the termination of the current to the workpiece.