Abstract: Systems and methods for network failover in digital substations are provided. One method includes receiving, by an intelligent electronic device (IED) from a process interface unit (PIU), in parallel a pre-configured data stream via a point-to point connection and one or more other data streams via an Ethernet network. The method further includes determining that at least one of the following failure conditions is satisfied: a frame in the pre-configured data stream is lost or delayed, quality of the data in the frame in the data stream is below a first threshold, period of the time associated with the data in the frame in the data stream is below a second threshold, or a health indicator associated with the PIU is below a third threshold. The method further allows identifying at least one redundant frame in the one or more other data streams. If the quality of data in redundant frame is satisfactory, the method proceeds to use the redundant frame for further processing.

Abstract: A system for manufacturing boiler tubes includes a first spindle for receiving a first tube having a first weld preparation, a second spindle for receiving a second tube having a second weld preparation, the first spindle and the second spindle being rotatable synchronously, and a welding device having a first weld head. The welding device is configured to automatically weld the first tube to the second tube according to a control routine stored in memory to produce a boiler tube.

Abstract: The present disclosure relates to a stripping tool, and an arrangement for stripping a conductor bar from a slot of a core of an electric machine. The disclosure provides a device to facilitate the removal of a conductor bar out of a slot of an electric machine. A stripping tool is described with a piston and a support to apply the piston to the core, a rope to be wound around the conductor bar, and a puller suitable to move the rope vertically to the core to pull the conductor bar out of the slot by means of the rope.

Abstract: In differential protection schemes for electrical power systems there is a need to employ a synchronization technique to enable time alignment of local terminal current with received current from a remote terminal in order reliably to operate the differential protection scheme. A method of determining a communication time delay in a communication network between a local terminal and each of a plurality of remote terminals in a multi-terminal multi junction electrical power system includes: (a) calculating a respective initial communication time delay between each remote terminal and the local terminal; (b) calculating a respective junction time delay between respective first, second and third pairs of adjacent junctions; and (c) correcting the calculated initial communication time delay of each remote terminal spaced from the local terminal by two or more junctions according to each corresponding junction time delay arising between the or each said remote terminal and the local terminal.

Abstract: A DC electrical network comprising DC terminals operatively connectable to a converter; and DC transmission paths arranged to interconnect the DC terminals, and including a DC power transmission medium and a switching apparatus. The DC network further including: an active power electronic device connected in at the DC transmission paths, the active power electronic device; a detector configured to detect faults in the DC transmission paths; and a control unit programmed to operate the active power electronic device to vary an apparent impedance of a faulty DC transmission path to force a current flowing in the faulty DC transmission path to reduce to a target current level, and operate the switching apparatus to block current from flowing in the faulty DC transmission path when the current flowing in the faulty corresponding DC transmission path is reduced to the target current level.

Abstract: In the field of multi-terminal electrical power network protection, a protection apparatus comprises a measurement apparatus to measure the respective terminal current (IL, IR1, IR2, IR3, IR4, IR5) flowing at each terminal (L, R1, R2, R3, R4, R5) in a multi-terminal network that includes a plurality of electrically interconnected terminals (L, R1, R2, R3, R4, R5). The protection apparatus also includes a control unit that is programmed to process the measured terminal currents (IL, IR1, IR2, IR3, IR4, IR5) to obtain first and second summed values (IPOS(n), INEG(n)).

Abstract: A method for manufacturing a mechanical component by additive manufacturing which includes at least one layering sequence of depositing a powder material and locally melting and resolidifying the powder material. In each layering sequence, a solid layer of solidified material is formed, wherein the solid layers jointly form a solid body. An annealing sequence subsequent to at least one layering sequence includes, locally heating at least a region of the solid body in effecting a local heat input to the immediately beforehand manufactured solid layer which was formed by the immediately precedent layering sequence, with temperature being is maintained below a melting temperature of the material.

Abstract: A DC breakers and in particular to DC breaker modules suitable for use in a high voltage DC circuit. The breaker module comprises at least a first breaker circuit (enclosed within a conductive enclosure. The enclosure is configured such that the first breaker circuit can be connected (in an electrical path with a circuit external to the conductive enclosure. The conductive enclosure is further configured to be connected to a node of the electrical path such that, in use, the conductive enclosure is at the same voltage potential as the node of the circuit path. The conductive enclosure may be a standardised size and may, for example, be a standard shipping container. The methods and apparatus of the present application allow a DC breaker to be formed from modules that can be built, tested, transported and installed in a standardised enclosure.

Abstract: A beater wheel for a pulverizer mill is provided. The beater wheel includes a rotatable hub disc having apertures defined therethrough and a ring disc having respective apertures defined therethrough, and a plurality of tubular ribs, disposed therebetween and weldingly coupled thereto at a tubular first end to the hub disc and at a tubular second end to the ring disc to define respective weld joints thereat. Each respective aperture in the hub disc and ring disc are sized and disposed to allow direct access therethrough to at least one respective weld joint at the respective interior surface of the first and second tubular ends for inspection and testing.

Abstract: A gas stripper system for purification of a primary coolant contaminated in cooling a nuclear reactor is provided. The gas stripper system includes a gas stripper column and a condenser arrangement. The column is adapted to receive the liquid phased contaminated primary coolant. The column defines top, bottom and middle sections and includes a distributor member, a re-boiler member and a separation member disposed therealong. The distributor member, a re-boiler member and a separation member with structured packing are configured such that maximum contact between the liquid phased primary coolant and gaseous phased primary coolant is made. Moreover, the condenser arrangement is configured to the gas stripper column to receive and condense the vapour phased primary coolant.

Abstract: A modular power converter includes first and second terminals to connect to electrical networks and at least one module connected between the first and second terminals, the module(s) including at least one switching element and at least one energy storage device, the switching element(s) and the energy storage device(s) combining to selectively provide a voltage source, the switching element(s) being switchable to transfer power between the first and second terminals. The converter further includes a control unit configured to selectively control switching of the switching element(s) to store energy from or release energy to either or both of the first and second terminals so as to decouple respective power flows at the first and second terminals and thereby inhibit a modulation of power flow at one of the first and second terminals from modifying a power flow at the other of the first and second terminals.

Abstract: A nozzle with an electric arc-blast having a median part of a first dielectric material and two end parts. The nozzle includes an insert of a second dielectric material, chosen from among: a composite material including a fluorocarbon polymer matrix and inorganic filler A chosen from among a sulfur, a ceramic and an oxide (SiO2, TiO2, Al2CoO4, ZnO, BaTiO3 and P2O5), in a percentage weight ranging between 0.1% and 10%, and/or at least one inorganic filler B (a graphite, a mica, a glass and a fluoride), in a percentage weight ranging between 5% and 50%, and a ceramic material including compound(s) (a carbide, a boride and an oxide).

Abstract: A power semiconductor module including a housing within which lies at least one semiconductor switching element. The housing includes a vent aperture that is selectively openable and closeable by a cooperating vent cover. The vent cover is held in an open position during normal operation of the power semiconductor module to open the vent aperture and provide ventilation for the or each semiconductor switching element within the housing.

Abstract: The present invention provides methods and apparatus for controlling HVDC power transmission systems so as to increase the effective lifetime of cables carrying the DC power (and particularly the extruded polymer insulation of those cables). The method includes entering a maintenance mode in which the electrical properties applied to the cable are varied so as to facilitate diffusion of space charge accumulation in the extruded polymer insulation.

Abstract: A blade for a gas turbine is described, the blade comprising a trailing edge and a trailing edge cooling channel extending from a first upstream end to a second downstream end, in which the width of the trailing edge cooling channel in the direction perpendicular to the camber line of the blade varies and the narrowest width in the trailing edge cooling channel is at the first upstream end, so as to provide a blade where the trailing edge can be removed with a minimal change or no change in the cooling flow capacity through the trailing edge cooling channel. Related methods are also described.

Abstract: Enclosures for vertical pulverizer systems are disclosed. The enclosure may include a vertically oriented cylindrical body forming an internal cavity. The enclosure may also include a cover positioned above the cylindrical body. The cover may have a curved surface. Additionally, the enclosure may include an inlet channel formed through the cover, where the inlet channel may be in fluid communication with the internal cavity of the cylindrical body, and an outlet channel formed through the cover, adjacent the inlet channel. Furthermore, the enclosure may include a base component positioned within the internal cavity of the cylindrical body, opposite the cover, the base component having a curved surface, a journal opening formed through the cylindrical body between the cover and the base component, and a journal opening cover coupled to the cylindrical body. The journal opening cover may cover the journal opening.

Abstract: A bipolar DC power transmission scheme comprises: DC poles, each including a respective power transmission medium extending between two ends; a plurality of converters, wherein each end of the power transmission medium of the first pole is respectively operatively connected to a converter, and each end of the power transmission medium of the second pole is respectively operatively connected to a converters; a controller programmed to block one or more of the converters in response to a fault occurring on either of the first and second poles; and a monitoring device configured to identify the faulty poles on which the fault has occurred, wherein the controller is further programmed to deblock the or each blocked converter connected to the other of the poles after the monitoring device has identified the faulty one of the poles on which the fault has occurred.

Abstract: A method for preheating a beater mill is provided. The method includes: rotating a beater wheel disposed within the beater mill to facilitate circulation of a gas stream between the beater mill and a furnace fluidly connected to each other via both a pulverized fuel conduit and a flue gas recirculation conduit; generating a burner gas via a burner disposed within the flue gas recirculation conduit such that the burner gas joins and heats the gas stream circulating through the beater mill and the furnace; and adjusting at least one of an air supply and a fuel supply to the burner via a controller based at least in part on one of a temperature of the gas stream at an entrance of the beater mill, a temperature of the gas stream at an exit of the beater mill, and an oxygen level within the beater mill.

Abstract: The present disclosure relates to a stacker and a method to assemble a stator core of an electric machine. Disclosed is a method for stacking a stator core of an electric machine, with the steps of providing a support adjacent to the stator frame to carry at least a sheet for the stator core, grabbing the at least a sheet with an arm arranged outside the stator core, the arm has a holding device for clamping the at least a sheet, guiding the at least a sheet inside the stator frame in a horizontal direction, and arranging the at least a sheet to compose the stator core.

Abstract: Disclosed is a turbo-engine component comprising a wall, the wall comprising a hot gas side surface and a coolant side surface. At least one coolant discharge duct is provided in said wall and opening out onto the hot gas side surface at a coolant discharge opening. A coolant flow direction is defined from the interior of the coolant discharge duct towards the discharge opening, the coolant discharge duct further being delimited by a delimiting surface thereof provided inside the wall. The coolant discharge duct has a first cross sectional direction and a second cross sectional direction. The coolant discharge duct is a blind cavity and is closed towards the coolant side surface, and further a dimension of the coolant discharge duct measured in the first cross sectional direction decreases in the coolant flow direction.