Abstract: Disclosed is a resistive superconducting fault current limiter capable of enhancing a current of a superconducting device thereof, capable of preventing heat generated at a linear coil, capable of removing a magnetic field generated through the linear coil when a normal current is applied to a circuit of a power system, and capable of using not only a BISCCO based superconducting device but also a YBCO based superconducting device with using a magnet generating device separated from the circuit of the power system so that a current of the power system can not flow to the linear coil of the resistive superconducting fault current limiter when a normal current flows to the power system.

Abstract: The present invention discloses a ground fault detection system and method for an inverter. The ground fault detection method for the inverter includes a reference value setting step for setting a reference value for estimating a ground fault current and a reference value for deciding a ground fault, a ground fault current estimation step for comparing a current value obtained by adding up current values flowing through each phase of an output terminal of the inverter with the reference value for estimating the ground fault current, and estimating generation of the ground fault current when the calculated current value is larger than the reference value, and a ground fault phase decision step for deciding the phase in which the ground fault has been generated on the basis of a current difference value between start and end points of 0 vector sections of each phase or between start and end points of 7 vector sections of each phase.

Abstract: Disclosed is a display device for a thermal magnetic type molded case circuit breaker capable to display a phase deficiency occurred on a line to a user such that the user rapidly deals with the phase deficiency and prevents loss caused by over-heating generated due to the phase deficiency. The thermal magnetic type molded case circuit breaker has a bimetal, which is bendable when heat is applied thereto, and a shifter coupled to an upper end of the bimetal and horizontally moved corresponding to a bending degree of the bimetal when over-current is applied thereto. The display device includes a power source for supplying electric power, a display for displaying the phase deficiency of the thermal magnetic type molded case circuit breaker by receiving power from the power source, a stationary contactor electrically connected to the power source and having a stationary contact, and a movable contactor electrically connected to the display and having a movable contact.

Abstract: In a hybrid DC electromagnetic contactor, by including a power unit for supplying a certain power voltage; a main contact point of a breaking switch for providing a supply path of the power voltage by being switched in accordance with a voltage apply to an operational coil; a switch for providing a supply path of the power voltage according to a gate signal; a snubber circuit for charging voltage at the both ends of the switch in turning off of the switch and being applied-discharged an electric current when the charged voltage is not less than a certain voltage; and a discharge current removing unit for removing the discharge current by providing a discharge current path to a load block in turning off of the switch, it is possible to minimize a size of leakage current when the main contact point and the semiconductor switch are turned off, and accordingly it can be practically used.

Abstract: Disclosed is a method of diagnosing inverter trouble capable of improving convenience of use and safety of the user by notifying the user of the error of switching devices used for outputting AC voltage of the inverter and the earth fault of an output of the inverter when applying power to the inverter.

Abstract: The present invention relates to a switching mechanism for preventing a trip error of a manual motor starter. While using the manual motor starter, even though a latch holder (4) is incompletely released from restraint by a trip lever (3) during trip operation of the switching mechanism (1), the trip lever (3) is pushed upward to allow a restrained state of the latch holder (4) to be completely released at any event. Therefore, when implementing reset operation of the switching mechanism (1), as a latch (2) is smoothly introduced between both pins (4a and 4b) of the latch holder (4) rotated by a predetermined angle, it is possible to prevent breakage of the switching mechanism (1).

Abstract: An elevator system without a machine room is disclosed. In this elevator system without a machine room according to the present invention, a built-in winding apparatus is installed in the interior of a hoistway for moving an elevator car. In addition, the elevator system without a machine room according to the present invention is characterized in that a movement stroke of a counterweight is shorter than a movement stroke of an elevator car, and a reinforcing installation member is installed across an upper portion of a pair of counterweight guide rails which corresponds to an upper counterweight moving distance, and a pair of counterweight guide rails are integral with the reinforcing installation member, and the built-in winding apparatus is installed on the reinforcing installation member in such a manner that the elevator car is moved by a driving force transferred by a motor roping unit.

Abstract: Disclosed is a handle apparatus of a manual motor starter having an improved structure for transferring driving force between a control lever and a driving lever. The handle apparatus comprises: a rotary handle for controlling ON and OFF operations of the manual motor starter, an interlocking member coaxially coupled with the rotary handle to be rotated by rotation of the rotary handle, the interlocking member having a first gear for providing a driving force; a driving lever having a second gear formed at one side of the driving lever to be rotated by the driving force by the interlocking member, the driving lever having a pin slot for providing a rotational driving force; and a control lever having a sliding pin inserted in the pin slot of the driving lever, through which the rotational driving force is transferred from the driving lever to the control lever.

Abstract: Vehicle measuring apparatus and method are disclosed to accurately measure height and width of a vehicle moving at a high speed. The vehicle measuring apparatus includes: a plurality of laser sensors separated from the road surface with a predetermined height and installed closely to each other corresponding to width of every roadway on the road, and receiving a reflection light of a laser light emitted onto the road from the plurality of the laser sensors and outputting a vehicle measurement signal; and a processor means electrically connected to the laser sensors and calculating height and width of the vehicle on the basis of the signal to measure the vehicle and previously stored installation information of the plurality of laser sensors.

Abstract: Disclosed is an interlocking apparatus of a leading undervoltage trip device for a manual motor starter. The interlocking apparatus comprises a rotatable handle for allowing a user to manually manipulate the manual motor starter to ON or OFF position; a handle power transmitting member concentrically connected to the handle to be integrally rotated with the handle and having a gear portion; and a lever portion extending in a direction perpendicular to an axis of the handle power transmitting member, to be interlocked with the leading undervoltage trip device.

Abstract: The present invention relates to a switching mechanism for preventing a trip error of a manual motor starter. While using the manual motor starter, even though a latch holder (4) is incompletely released from restraint by a trip lever (3) during trip operation of the switching mechanism (1), the trip lever (3) is pushed upward to allow a restrained state of the latch holder (4) to be completely released at any event. Therefore, when implementing reset operation of the switching mechanism (1), as a latch (2) is smoothly introduced between both pins (4a and 4b) of the latch holder (4) rotated by a predetermined angle, it is possible to prevent breakage of the switching mechanism (1).

Abstract: Disclosed is a handle apparatus of a manual motor starter having an improved structure for transferring driving force between a control lever and a driving lever. The handle apparatus comprises: a rotary handle for controlling ON and OFF operations of the manual motor starter, an interlocking member coaxially coupled with the rotary handle to be rotated by rotation of the rotary handle, the interlocking member having a first gear for providing a driving force; a driving lever having a second gear formed at one side of the driving lever to be rotated by the driving force by the interlocking member, the driving lever having a pin slot for providing a rotational driving force; and a control lever having a sliding pin inserted in the pin slot of the driving lever, through which the rotational driving force is transferred from the driving lever to the control lever.

Abstract: A rotation speed search apparatus for an induction motor includes: a voltage control unit for comparing a rated current of a motor and a current detected from the motor and generating an output voltage; and a frequency control unit for comparing a reference excitation current of the motor and an excitation current detected from the motor and generating an output frequency. In case of a big load, an output frequency is reduced. Thus, the slip of the motor is moved to a slip where a maximum torque is generated to enable the induction motor to start. If the speed of the motor in operation is greater than a target frequency, an output frequency is increased, so that the motor can be operated even in the regenerative region of the motor.

Abstract: A system for determining a kind of vehicle and a method therefore, including a vehicle detection unit for detecting a vehicle which reaches to a vehicle detection region on a roadway, a wheel shaft number counting unit for counting a number of wheel shafts of the detected vehicle, an image photographing unit for photographing a front or rear image of the detected vehicle and a vehicle kind determination unit for yielding distances and widths of the tires of the detected vehicle on the basis of the photographed image from the image photographing unit and determining the kind of the vehicle on the basis of the number of wheel shafts detected from the wheel shaft counting unit and the yielded distance and width values can precisely determine the kind of vehicle traveling the roadway.

Abstract: The present invention discloses a ground fault detection system and method for an inverter. The ground fault detection method for the inverter includes a reference value setting step for setting a reference value for estimating a ground fault current and a reference value for deciding a ground fault, a ground fault current estimation step for comparing a current value obtained by adding up current values flowing through each phase of an output terminal of the inverter with the reference value for estimating the ground fault current, and estimating generation of the ground fault current when the calculated current value is larger than the reference value, and a ground fault phase decision step for deciding the phase in which the ground fault has been generated on the basis of a current difference value between start and end points of 0 vector sections of each phase or between start and end points of 7 vector sections of each phase.

Abstract: Disclosed is a main switch conveying apparatus for a vacuum circuit breaker.