Abstract:
A semiconductor assembly includes a stack with a semiconductor module and a cooler, wherein the semiconductor module is provided in contact with the cooler. A clamping assembly is adapted to exert a force on the two sides of the stack. The stack is provided with a through hole between the two sides thereof and a part of the clamping assembly including an electrically conductive part which extends through the through hole of the stack. Thereby, a compact mechanical arrangement is provided while obtaining improved electrical properties, such as lower inductance and more even current distribution.
Abstract:
A resin impregnated paper (RIP) condenser core configured for being positioned around an electrical conductor. The condenser core includes a winding tube forming a longitudinal through hole through the condenser core, configured for allowing an electrical conductor to be inserted there through; an electrically insulating RIP body wound onto and around the winding tube; and at least one electrically conducting foil coaxially encircling the winding tube and being surrounded by the RIP body insulating each of the at least one foil from any other of the at least one foil. The winding tube is of an electrically insulating material which has been chosen from a group consisting of materials having a volumetric thermal expansion coefficient within the range of 50% to 200% of the volumetric thermal expansion coefficient of the RIP body.
Abstract:
It is provided a multi-phase electric drive for use with a multi-phase AC load and the power unit thereof. The multi-phase electric drive includes a multi-phase power transformer with at least one primary winding and a plurality of secondary windings. The primary winding may be electrically connected to a source of multi-phase AC power. Power units may have an input connected with a corresponding one of said plurality of secondary windings and may have a single-phase controllable output to such multi-phase AC load. The power units may be serially to connected with respective others of said power units in each phase output line and are connectable to said multi-phase AC load.
Abstract:
Embodiments of the present disclosure provide a method for monitoring a circuit breaker, comprising the following steps: obtaining a characteristic force associated with an actuating mechanism of the circuit breaker over the time; and determining the time point when the closing and/or opening of the circuit breaker occurs by identifying a variation of the force. The step of determining further comprises determining the moment when a variation increase of the characteristic force occurs as the time point of the closing of the circuit breaker; and determining the moment when a variation decrease of the characteristic force occurs as the time point of the opening of the circuit breaker. The method can be used to accurately on-line monitor the closing and opening time point of the circuit breaker.
Abstract:
A multilevel current source converter (CSC) for controlling electrical power transmission in a high voltage direct current (HVDC) transmission system includes an alternating current (AC) side for input/output of AC to/from the CSC; a direct current (DC) side for input/output of DC to/from the CSC; and a plurality of modular CSC cells connected in parallel with each other between the AC side and the DC side of the CSC, each modular cell comprising a plurality of switches. The CSC is configured for being connected in series with an HVDC transmission line and for injecting a voltage in series with the HVDC transmission line at the DC side of the CSC.
Abstract:
Embodiments disclose using a pairing or pairings of terminals in a DC power system including a plurality of terminals to implement power oscillation damping (POD), where the DC power system is connectable to at least one AC power system. The active and/or reactive power of the terminals in the pairing may be controlled or modulated in a similar manner such that no power imbalance in the DC power system is created. For example, POD may be implemented by means of active and/or reactive power modulation by pairing two terminals in the DC power system) such that their active and/or reactive powers are controlled or modulated in the same or substantially the same manner or identically but with the opposite sign.
Abstract:
A method and a system for calibrating a first coordinate system Rf of a robot unit with a second coordinate system Cf of an object identification unit, wherein the robot unit includes a robot arm with an end effector and the object identification unit includes a camera unit. The calibration is performed using a calibration marker on the end effector. The method determines the intrinsic and the extrinsic parameters of the camera unit in two steps, a first step where the intrinsic parameters and a rotational part of the extrinsic parameters are determined, and a second step where a translational part of the extrinsic parameters are determined.
Abstract:
The present invention discloses a rotary joint, comprises a wiring unit having a main portion of a flexible printed circuit (FPC) board therein. Said rotary joint further comprises a protective unit fixed to said wiring unit, in which an end portion of said FPC board is connected to a group of cables. The present application also provides a robot comprising said rotary joint. Compared with the existing prior arts, the proposed solutions prevent the damage of FPC during assembly and/or disassembly of robots, while not losing compactness.
Abstract:
A photometer is provided for measuring the concentration of a chromophore in a fluid. The photometer includes a light source, a sample cell and a detector. The light source includes first, second, third and fourth light emitting diodes (LEDs). Each of the first and second LEDs emit light at a measurement wavelength and each of the third and fourth LEDs emit light at a reference wavelength. The first and second LEDs are arranged diagonal to each other and the third and fourth LEDs are arranged diagonal to each other. The photometer performs a routine for correcting concentration measurement for LED drift.
Abstract:
A device for monitoring a surge arrester, including: a grounding line; a measuring unit including one or more analogue measuring circuits for measuring the electric current passing through the grounding line; an electronic processing unit for receiving measuring signals from the measuring circuits; a data storage medium for storing monitoring data produced by the processing unit; a base module, which accommodates the grounding line and the measuring unit; and an auxiliary module, which accommodates the processing unit and the data storage medium and is detachably mountable to the base module. When the auxiliary module is mounted to the base module, the components of the modules are connected to each other through a connector member provided on the base module and a corresponding connector member provided on the auxiliary module.