Abstract: The present invention relates to an interlock device of a ring main unit, and more particularly, to an interlock device of a ring main unit in which a fuse cover can be closed in interlock with a cable cover. An interlock device of a ring main unit according to an embodiment of the present disclosure may include an interlock frame provided in part of the ring main unit, a cam on part of which an engaging portion is protruded and formed and on the other part of which a slit is formed, rotatably provided within the interlock frame, an operating plate an end of which is coupled to the slit to perform a vertical movement, and a spring an end of which is fixed to part of the cam to store an elastic force due to the movement of the cam.

Abstract: An apparatus for detecting noise in a power supply of a PLC analog input/output module is provided. The apparatus may include a capacitor configured to extract a noise determination target voltage from a driving voltage outputted from the power supply; a voltage conversion unit configured to convert the noise determination target voltage outputted from the capacitor and to output the converted noise determination target voltage; a comparison unit configured to compare the noise determination target voltage converted by the voltage conversion unit with a reference voltage; and a determination unit configured to determine whether the noise determination target voltage is a noise, based on a comparison result by the comparison unit.

Abstract: The disclosure relates to an electric power conversion apparatus, and capable of determining a minimum output voltage of a boost converter based on a voltage of the grid, and comparing the minimum output voltage of the converter with an input voltage of the converter, and controlling the operation of the converter based on the comparison result, thereby reducing the unnecessary operation and switching loss of the converter, the electric power conversion apparatus according to the invention comprises a converter; and a control unit configured to detect a grid voltage to determine a minimum output voltage of the converter based on the grid voltage, and control the operation of the converter based on an input voltage of the converter and the determined minimum output voltage.

Abstract: Provided is a method of detecting a state of a power cable in an inverter system. The method includes detecting a direct current (DC)-link voltage value of a DC-link capacitor included in an inverter, detecting a battery voltage value of a battery supplying a DC power to the inverter, comparing the DC-link voltage value with the battery voltage value, and determining the state of the power cable connecting the inverter to the battery to be abnormal when a difference between the DC-link voltage value and the battery voltage value is out of a preset range.

Abstract: A photovoltaic system is provided. The photovoltaic system includes a data collecting device collecting data about photovoltaic generation from a photovoltaic device, and an external device receiving the data about the photovoltaic generation from the data collecting device and providing data update to the data collecting device or photovoltaic device.

Abstract: A data collecting device collecting state information of a photovoltaic device is provided. The data collecting device includes a reception unit collecting the state information, and a transmitting unit transmitting the state information according to a state information transmission time based on a state information group including the state information.

Abstract: A photovoltaic device is provided. The photovoltaic device includes a photovoltaic cell array absorbing solar voltaic energy to convert the solar voltaic energy to electrical energy, and a sensing unit sensing at least any one of power generation information for representing a state of the photovoltaic device and environmental information for representing environmental information around the photovoltaic device, and measuring a time when the at least one of the power generation information and the environmental information is sensed.

Abstract: Disclosed is a signal coupling apparatus for power line communication, the apparatus comprising a housing centrally formed with a groove to pass a power line there through, and a non-contact interface unit accommodated inside the housing to induce a power signal or a power line communication signal from the power line using an electromagnetic induction.

Abstract: A bypass switch for high voltage direct current (HVDC) transmission is provided. The bypass switch includes a housing, a fixed contactor disposed in the housing and electrically connected to a first portion of a HVDC transmission circuit, a movable contactor movably disposed in the housing at a position spaced apart from the fixed contactor and electrically connected to a second portion of the HVDC transmission circuit, an insulation member coupled to a side of the movable contactor, an explosive actuator disposed at one side of the insulation member and exploded according to an electrical signal, and a piston mechanism which is moved by the force of gas generated due to the explosion of the explosive actuator, applies force to move the insulation member, and allows the fixed contactor and movable contactor to be electrically connected to each other.

Abstract: The instant trip apparatus of the molded case circuit breaker includes a case, a magnet part disposed in the case to generate magnetic attractive force when accident current flows therethrough, an armature disposed to face the magnet part, the armature rotating to the magnet part by the magnetic attractive force, an armature spring for allowing the armature to elastically return to its original position when the magnetic attractive force is removed, and a gap maintenance part restricting the rotation of the armature so that a gap defined between the armature and the magnet part is maintained when the accident current occurs. The gap maintenance part includes a rotation restriction member that is disposed to be exposed to an armature rotation path between the armature and the magnet part. Thus, fusion between the armature and the magnet part due to the accident current occurs may be prevented.

Abstract: An electric vehicle relay includes: a pair of fixed electrodes; a movable electrode movable to contact or to be separated from the fixed electrode; a driving shaft which performs a vertical motion as an upper end thereof is coupled to the movable electrode; a fixed core fitted into a central part of the driving shaft with a gap; a movable core coupled to a lower end of the driving shaft and sucked by a magnetic force of the fixed core; and a cylinder configured to insertion-support the fixed core and the movable core, wherein locking protrusions are formed on an outer circumferential surface of the movable core, wherein inclined grooves for inserting the locking protrusions are formed on an inner circumferential surface of the cylinder, and wherein the movable electrode is rotated as the locking protrusions are moved along the inclined grooves when the movable core performs an up-down motion.

Abstract: A transformer position adjustment preventing device includes a case having a handle insertion unit formed therein, a position displaying unit disposed in the case and displaying a test position or an operation position of a transformer truck with a transformer seated thereon, a rotating member disposed in the case, connected to the position displaying unit, rotated by the rotation of the position displaying unit to open or close the handle insertion unit, and a restricting member rotated in a direction of the rotating member or an opposite direction of the rotating member according to opening or closing of a door opening and closing the transformer chamber in which the transformer truck is disposed, so as to restrict the rotation of the rotating member or release the restriction state.

Abstract: The present invention employs a separate rotation-adjusting member, which allows a position of a circuit breaker or a transformer to be recognized from outside without an error.

Abstract: An apparatus for controlling an induction machine is disclosed, wherein a magnitude of a current outputted to the induction machine to an inverter is determined by the apparatus to determine a voltage amount that compensates the command voltage in response to the magnitude of the current, and a voltage compensation amount is added to a command voltage determined from a voltage-frequency relationship according to a relevant voltage compensation amount to output a final command voltage.

Abstract: Disclosed is a molded case circuit breaker. The molded case circuit breaker includes include: a case; an interrupter assembly installed in the case, and provided with an arc gas outlet; an exhaustion guiding portion disposed between the interrupter assembly and the terminal portion; an exhaustion cover mounted to the case, with a structure to cover the exhaustion guiding portion; and exhaustion guides spaced from each other in the exhaustion guiding portion, in a direction perpendicular to an arc gas discharge direction, in a state where the gas divergence portion is disposed therebetween, the exhaustion guides forming the arc gas passage together with the gas divergence portion. Under such configuration, arc gas discharged out of the arc gas outlet can be rapidly discharged to outside through the exhaustion guides, without an eddy current.

Abstract: This invention is suitable for directly driving from an alternating current (AC) line voltage source an array of LED lamps with a minimal amount of ancillary circuitry. Most of the required circuitry is situated within an integrated circuit, which includes a full wave rectifier, transient protection, a current control transistor, a feedback control loop, and overheating protection. The integrated circuit powers a transistor circuit structured as a constant current source to energize individual groupings of LEDs, as well as larger configurations of LEDs. The invention is useful for various lighting arrangements such as luminaires, bollards, strip lights, task lights, lighting tubes, and other types of applications that use a multitude of LEDs powered directly by AC line voltage without the requirement of a direct current power supply. This invention may further be used with an external phase switching dimmer apparatus.

Abstract: An instant trip device of a circuit breaker comprises a magnet; a supporter; an armature provided between the magnet and the supporter and including a rotation center portion and a rotating part is disposed to be rotatable with respect to the rotation center portion; and an armature spring configured to apply an elastic force in a direction where the rotating part of the armature becomes farther away from the magnet, wherein a groove of which one side is opened is formed at the supporter to support the rotation center portion, wherein a boss is formed at the rotation center portion to be inserted into the groove, and wherein the armature spring is an extension spring in which one end of the armature spring is supported by a first hanger included in the supporter, and the other end is supported by a second hanger included in the rotating part.

Abstract: The present invention relates to a transportation device of a withdrawable circuit breaker, and more particularly, to a transportation device of a withdrawable circuit breaker capable of simultaneously moving right and left handles of a girder assembly for restricting movement of the transportation device or releasing a restricted state. The transportation device of a circuit breaker includes: a truck assembly on which a body of the circuit breaker is loadable; a body plate of a girder assembly installed on a front surface of the truck assembly; a pair of sliding plates slidably installed in the body plate; and a rotation plate having both sides to which leg portions of the sliding plates are rotatably coupled, respectively, wherein the rotation plate is inserted into a lead screw penetratingly-formed at a central part of the girder assembly.

Abstract: A switchboard applied with a bushing-type current transformer includes a terminal bushing inserted from a front direction, a switchboard terminal coupled to the terminal bushing, a metering current transformer bushing inserted from a front direction and inserted into the terminal bushing while wrapping the switchboard terminal, and a metering current transformer disposed outside the metering current transformer bushing and assembled or disassembled at a front surface through a circuit breaker chamber. Thus, the switchboard applied with a bushing-type current transformer has an advantage of having a high degree of internal space utilization or capable of being made to be compact.