Abstract:
A method of increasing accuracy of optical sensors based on generating two sets of light waves having different velocities in the presence of a non-vanishing measurand field within a sensing element of the sensor is described. A defined static bias phase shift is introduced between the two sets of light waves. The sensor converts a total optical phase shift including static bias optical phase shifts and measurand-induced optical phase shifts into anti-phase optical power changes in at least two detector channels. The method includes steps of normalizing the optical power changes after their conversion into electrical detector signals in the two detector channels to reduce effects of uneven intensity or power of the light source and different loss or gain in the detector channels. Further methods, sensors and apparatus for temperature stabilizing such optical sensors and novel sensors are also presented.
Abstract:
In a method for gathering time-variable data from electronic slave devices in data communication through a data transmission channel with an electronic master device, the slave devices periodically measure and store a current value of at least one respective time-variable parameter (P1(t), . . . Pn(t)). The master device sends a freeze command to the slave devices. Upon receipt of the freeze command from the master device, the slave devices freeze the last measured value of the at least one time-variable parameter. During a data-gathering time interval following sending of the freeze command, the master device gathers the frozen values from the slave devices.
Abstract:
The invention relates to a bipolar non-punch-through power semiconductor device and a corresponding manufacturing method. The device comprises a semiconductor wafer and a first electrode formed on a first main side of the wafer and a second electrode formed on a second main side of the wafer opposite the first main side. The wafer comprises a pair of layers of different conductivity types, such as a drift layer of a first conductivity type, and a first layer of a second conductivity type arranged on the drift layer towards the first main side and contacting the first electrode.The wafer comprises an inner region wand an outer region surrounding the inner region. The drift layer has a thickness in the inner region greater or equal than a thickness in the outer region. A thickness of the first layer increases in a transition region between the inner region and the outer region from a thickness in the inner region to a maximum thickness in the outer region. The thickness of the first layer increases linearly over the transition region with a width of the transition region greater than 5 times a thickness of the first section of the first layer.
Abstract:
A control system for mounting to a rail. The control system includes a control assembly and one or more I/O assemblies. The control assembly and each I/O assembly includes a module removably mounted to a base. The base has a body with a channel formed therein that is adapted to receive the rail. A latching assembly is mounted to the body and includes a lever movable between a latched position and an unlatched position, wherein the movement of the lever between the unlatched and latched positions moves latching members into and out of the channel, whereby when the rail is disposed in the channel and the lever is moved to the latched position, the latching members move into the channel, thereby trapping the rail in the channel and securing the base to the rail. When the module is mounted to the base, the module covers the lever of the latching assembly so as to be inaccessible.
Abstract:
A method for communication between nodes (UR1; UR2; UC1-UC16) of a network, interconnected by a transmission channel and each identified by a node identification number in which at least one transmitter node emits at least one message to at least one message recipient node. The message comprises a description of a path (PH) between the transmitter node which emits the message and the message recipient node. The path is defined by the node that emits the message via a sequence of node identification numbers along the path itself.
Abstract:
A DC/AC converter apparatus comprising: input terminals (10) to be connected to a DC power source; a DC/AC conversion unit (11) adapted to receive input DC electrical power via the input terminals and to convert the input DC electrical power into AC electrical power, the DC/AC conversion unit comprising two output terminals (12); two AC backup output terminals (14); a switch arrangement (13) adapted to selectively connect the two AC output terminals to the grid terminals and to the two AC backup output terminals; a control unit (16) associated to the switch arrangement and adapted to: drive the switches of the switch arrangement, sense when an AC voltage at the grid terminals is below a predetermined threshold; and automatically drive the switches of the switch arrangement in such a way to disconnect the two AC output terminals from the grid terminals and to connect the two AC output terminals to the two AC backup output terminals when the AC grid voltage is below a said predetermined threshold.
Abstract:
The invention concerns a method of fault location in HVDC (High Voltage Direct Current) transmission lines, especially in mixed lines, where part of the line is overhead line and part is a cable line. The fault location is based on estimation arrival times of travelling waves induced by fault in transmission line that are propagating along the line from faulted point to the measurement point, which is located at one end of the transmission line.
Abstract:
A pole part of a circuit-breaker arrangement having an insulation housing for accommodating a vacuum interrupter insert containing a pair of corresponding electrical switching contacts, wherein a fixed upper electrical contact is connected to an upper electrical terminal molded in the insulation housing and a movable lower electrical contact is connected to a lower electrical terminal of the insulation housing via an electrical conductor which is operated by an adjacent pushrod. The lower electrical terminal is connected to a ring shaped heat transfer shield arranged along the inner wall or at least partly inside the wall of the insulation housing surrounding the pushrod and/or the distal end of the movable lower electrical contact.
Abstract:
A vacuum interrupter is disclosed with transition areas between metal housing parts and ceramic housing parts covered by insulating material. To enhance dielectric performance and field grading behavior, the insulating material can extend as a tube or a multilayer tube design over at least nearly a complete length of the vacuum interrupter or vacuum device arrangement. The insulating material can be filled or at least covered at an inner surface which comes into close contact with the vacuum interrupter or vacuum device surface, with metal and/or conductive metal oxides.
Abstract:
A dry-type electrical transformer includes a coil assembly having at least one winding wound into a plurality of concentric turns, at least one cooling sector defined between adjacent concentric turns, spacers positioned inside the cooling sector and spaced from each other to allow a plurality of air ducts each defined between two adjacent spacers, and at least one electrical shield positioned in the cooling sector and arranged to electrically shield the air ducts. At least one electrical shield is positioned in the cooling sector and arranged to electrically shield the air ducts. The electrical shield include a first end edge connected to the turn at the inner side of the cooling sector, a second end edge which is free and electrically insulated from the surrounding parts, and a central portion extending between the first and second end edges and is positioned at the outer side of the spacers.