摘要:
Disclosed is a withdrawable device of main circuit for a circuit breaker. A ring-shaped guide recess is formed at a central part of a transfer nut screw-coupled to a lead screw, and supporting surfaces are formed on side surfaces of the guide recess. And, rotation prevention pins are elastically supported by springs in a moving direction of the transfer nut, and are selectively locked, thereby allowing the transfer nut to perform an idle operation. Accordingly, a structure for an idle operation of the transfer nut is simplified, and the number of components is reduced. An axial load is attenuated to a plane-contact distributed load, not a point-contact concentrated load, thereby preventing damage of the components. Also, a vacuum circuit breaker has enhanced reliability of the idle operation at a run position and a test position.
摘要:
Disclosed is a circuit breaker having a cam rotation delaying function employed to block current, the circuit breaker performing a charging operation and a charting operation, the circuit breaker including a closing spring having one end portion rotatably coupled to each of plates, a driving lever rotatably installed at each of the plates and connected to another end portion of the closing spring so as to be rotated responsive to compression and extension of the closing spring, a cam rotatably installed at each of the plates and configured to press the driving lever for rotation, a link mechanism having a plurality of links rotatably installed at each of the plates and connected to the driving lever for operation, a movable contact rotatably installed at a side of each of the plates and contactable with a terminal by an operation of the link mechanism, and a cam delaying mechanism installed at each of the plates and configured to attenuate a rotational force of the cam due to a restoring force of the closing spring, whereby an excessive rotation of the cam can be prevented by the cam delaying mechanism so as to allow stable and complete toggling operation of the link mechanism and a smooth restoring operation of the closing spring, thereby providing more stable operation of the circuit breaker.
摘要:
A time delay output apparatus for a circuit breaker includes a switch disposed at one side of a main shaft rotatable in directions to open/close a fixed contactor and a movable contactor, and a delay member disposed between the main shaft and the switch so as to operate the switch with a preset time delay, thereby simplifying the construction and reducing the size as well as enhancing operational reliability by stably obtaining a time delay.
摘要:
A method for detecting offset signal corresponding to transmission leakage signal is disclosed, whereby reception sensitivity can be improved by accurately offsetting a leakage signal in transmission signal mixedly inputted into the reception signal in a radio transceiver, and an offset signal corresponding to a transmission leakage signal can be rapidly detected in the radio transceiver to rapidly offset the transmission leakage signal included in a reception signal.
摘要:
Disclosed is a switching device of a dual-port Ethernet system capable of solving a conflict caused by the dual-port in an Ethernet system having the dual-port. According to the present disclosure, there is little transmission delay when the data frame is relayed between ports in the dual-port Ethernet system. Further, when a frame relay transmission is simultaneously generated with a frame transmission of an upper layer device, it is possible to prevent a conflict by determining a priority.
摘要:
An apparatus for controlling operation of inverter system configured to drive a motor by using an inverter, and to normally operate the motor in a resonance-generated frequency band if the resonance occurs, and a method thereof are disclosed, wherein the method includes detecting a current outputted by an inverter system to a motor, if an operation frequency of the motor is in a resonance frequency band, converting the detected current to a d axis current and a q axis current, calculating a difference between the converted d axis current and pre-sampled d axis current (magnetic flux portion), multiplying the calculated difference by a preset comparative control gain to calculate a comparative control voltage, and adding the calculated comparative control voltage to a torque portion voltage responsive to an operation frequency of the motor to generate a driving voltage of the motor.
摘要:
Disclosed are a plug interlock device for a circuit breaker and a circuit breaker having the same, wherein a plug is not allowed to be separated from a connector while a breaker main body is moved from a test position to a run position or is running at the run position, thereby obviating the plug from being unexpectedly unplugged from the connector while the breaker main body is moved from the test position to the run position or is running, resulting in preventing a safety accident in advance.
摘要:
Disclosed is a location tracking system and the method thereof for storing location information. The location tracking system includes at least one beacon apparatus arranged to transmit a beacon signal to a tag; a tag at any position respectively measuring a signal intensity of beacon signals received from surrounding at least one beacon apparatus, and transmitting a measured per-beacon signal intensity to a specific beacon apparatus; and a server arranged to determine if at least any one of signal intensities exceeds a set maximum value by analyzing a per-beacon signal intensity input from the specific beacon apparatus, and store a location-based signal intensity into a database by equally dividing a distance between corresponding beacon apparatuses and then distributing a measured signal intensity into a divided each position in mutiple cases the signal intensity exceeds a set maximum value.
摘要:
The present invention relates to a control device and a control method of a high voltage inverter capable of automatically and accurately setting up neutral point information at a master controller and a plurality of cell controllers of the high voltage inverter, wherein a master controller determines information of neutral point set up to itself and performs a communication with the cell controllers each disposed at each of a plurality of U phase unit cells, a plurality of V phase unit cells and a plurality of W phase unit cells to determine the neutral point information preset on the cell controllers and to detect a cell controller set up with neutral point information different from that of the master controller, and to correct the neutral point information of the detected relevant cell controller using the neutral point information set up in the master controller, thereby operating the high voltage inverter.
摘要:
Disclosed is a slide type movable contactor for a circuit breaker with a slidable structure by which a contact pressure with the movable contactor is increased in a conduction state so as to minimize resistance and heat generation, the assembly including a movable contactor rotatable based upon a rotational shaft, connection plates configured to allow rotation of the movable contactor and simultaneously provide a conduction path by a contact with the movable contactor, and bimetal plates installed at side surfaces of the connection plates, respectively, and bends towards the connection plates in response to a temperature increase in a conduction state to press the connection plates so as to increase a contact pressure of the connection plates onto the movable contactor.