Abstract: A direct current circuit breaker system operable to interrupt a direct current flowing through a direct current line. The direct current line has a first potential with respect to ground potential and is elevated above ground level providing an electrically insulated gap, the direct current circuit breaker system including: one or more electrical sub-systems elevated above ground level and configured to operate at the first potential; a first electrical generator elevated above ground level and configured to operate at the first potential, wherein the first electrical generator is arranged to convert received energy into electrical energy at the first potential, the electrical energy for powering the electrical sub-systems; and an electric motor for generating the received energy, wherein the electric motor is configured to operate at ground potential and is operably coupled to the first electrical generator via a physical connection, wherein the physical connection is electrically insulated.

Abstract: Method and system for transitioning from a first liquid fuel supplied to a combustor of a gas turbine system to a second liquid fuel supplied to the combustor utilizing a fuel pump configured to supply both fuels from the fuel pump during the transition without shutting down the gas turbine system. Through utilizing a fuel pump and adjusting the operation of the fuel pump during the transition, the additional costs, size, and operational complexity associated with multiple liquid fuel trains to facilitate operation of the gas turbine system with multiple liquid fuels may be avoided. The utilization of multiple liquid fuels during operation of a gas turbine system increase the operational flexibility of the gas turbine system by enabling the utilization of varied liquid fuel sources and/or local liquid fuel sources during a steady-state operation, yet utilizing standardized fuel sources for startup or shutdown procedures.

Abstract: Systems and methods for adjusting a controller for a power converter during a rate-of-change-of-frequency (RoCoF) event may include determining, based on first frequency information, a first RoCoF and a second RoCoF for the power converter; determining that the first RoCoF and the second RoCoF are both positive numbers or are both negative numbers; detecting a possible RoCoF event; comparing the first RoCoF to a positive RoCoF activation threshold when the first RoCoF is positive or to a negative RoCoF activation threshold when the first RoCoF is negative, and a power of the power converter to an upper or lower active power activation threshold; detecting, based on the threshold comparisons, a RoCoF event; and applying, during the RoCoF event, a RoCoF ride through.

Abstract: A system and a method for managing a fault on a transmission line. The system includes an electrical branch, a diode arrangement and a controller. The electrical branch includes an inductor and a circuit breaker connected in series between a first terminal and a second terminal. The circuit breaker is configured to connect or disconnect the first terminal and the second terminal. The diode arrangement includes at least one diode, wherein a first end of the diode arrangement is connected to the electrical branch, and a second end of the diode arrangement is connected to a third terminal. The controller is configured to receive an indication signal, wherein the indication signal is indicative of a forward current in the diode arrangement. The controller is further configured to, in response to receiving the indication signal, issue a command to the circuit breaker to disconnect the first terminal and the second terminal.

Abstract: A navigation apparatus for use in navigating a pipe includes a body, a movable core coupled to the body by a sacrificial connector, and a drive assembly configured to engage an interior wall of the pipe to propel the navigation apparatus through the pipe. The drive assembly including a first arm, a second arm, and a wheel, wherein the first arm is pivotably coupled to the core and the wheel, and the second arm is pivotably coupled to the body and the wheel.

Abstract: A vibration dampening system is provided for a turbine nozzle or blade. A body opening extends through the turbine nozzle or blade, e.g., through the airfoil among potentially other parts of the nozzle or blade. A vibration dampening system includes a plurality of stacked damper pins within the body opening. Each damper pin includes an outer body having defined therein an inner opening and a plurality of side openings extending from the inner opening through an outer surface of the outer body; and an inner body that is nested and movable within the inner opening of the outer body. The inner body includes a first portion including a plurality of arms, each arm extending through a respective side opening of the outer body to frictionally engage the body opening. The end surfaces of the damper pins and the two bodies frictionally engage to dampen vibration.

Abstract: Embodiments of the disclosure relate to the aligning of a melting beam source in an additive manufacturing (AM) system. Methods of the disclosure may include forming a first test article and a second test article of different shapes on a build plate. The method further includes measuring a vertical scale, vertical alignment, horizontal scale, and an alignment of the melting beam source using the first and second test articles. The method includes determining whether one of the vertical scale, the vertical alignment, the horizontal scale, or the horizontal alignment of the melting beam source is not within a corresponding tolerance of a target specification. If at least one of the vertical scale, the vertical alignment, the horizontal scale, or the horizontal alignment is within the corresponding tolerance, the method includes adjusting the melting beam source of the AM system to align the melting beam source to yield the target specification.

Abstract: A system for manufacturing a panel includes a forming assembly having opposing press plates and at least one platen assembly arranged between the opposing press plates. The platen assembly includes first and second platens connected together via at least one elastic deformable member. Further, the forming assembly is operable in a heating mode and a cooling mode. Moreover, the first platen is maintained at a predetermined temperature range during each of the heating and cooling modes. During the heating mode, the elastic deformable member(s) is compressed such that the first and second platens contact each other. As such, one or more layers of material to be consolidated are held by the forming assembly as the forming assembly applies heat and pressure to the layer(s), thereby consolidating the panel.

Abstract: A system includes a turbine exhaust section downstream of a turbine. The turbine exhaust section includes an exhaust flow path. The turbine exhaust section also includes an inner wall radially disposed along the exhaust flow path. The turbine exhaust section also includes an outer wall disposed radially outward of the inner wall and along the exhaust flow path. The system also includes a fluid injection system configured to inject a fluid into a chamber radially disposed between the inner wall and the outer wall via a plurality of inner ports disposed in the inner wall. The plurality of inner ports is disposed downstream of a downstream edge of a last stage blade of the turbine.

Abstract: A system includes a gas turbine having a turbine shaft disposed along a rotational axis, a turbine casing disposed circumferentially about the turbine shaft, a combustion gas path disposed between the turbine shaft and the turbine casing, and a turbine stage disposed in the combustion gas path. The turbine stage includes a plurality of turbine vanes disposed upstream from a plurality of turbine blades. The gas turbine includes an isothermal expansion system coupled to the turbine stage, wherein the isothermal expansion system includes a plurality of flame stabilizers configured to vary axial positions of combustion within a turbine stage expansion of the turbine stage to reduce temperature variations over the turbine stage expansion. The flame stabilizers are disposed in different axial positions over an axial length between leading and trailing edges of the turbine blades, wherein at least one flame stabilizer is coupled to a plurality of the turbine blades.

Abstract: An apparatus and method for radiation measurement are used to determine clearance of a rotating gas turbine component. The apparatus includes a probe body on a stationary component outward of the rotating component and a pair of sensor assemblies coupled to the probe body. Each sensor assembly includes a plurality of prisms coupled to the probe body Each prism of the plurality of prisms has a distinct angular orientation to direct radiation from the focusing lens to the rotating component surface off-axis with respect to an axis of the respective radiation source of the pair of radiation sources and with less directional variation than radiation from the respective radiation source.

Abstract: Method of forming or repairing a part with an overhung section. The method may include removing a portion, and adding a section to the part. The section includes the overhung section. The adding includes sequentially layering at least one plurality of material layers on the part, the at least one plurality of material layers approximating dimensions of the section including the overhung section. The sequential layering may include, for example, laser welding, and may be carried out in a number of ways that create varied layers within the overhung section. The method may include machining the at least one plurality of material layers to form the section including the overhung section.

Abstract: A method for controlling a converter station in a power transmission network. The method includes: initially controlling, by a controller, the power converter to transfer power between the AC network and the transmission network via the first branch and the second branch; detecting, by the controller, a fault in the second branch; in response to detecting the fault in the second branch: issuing, by the controller, a first command to reduce an AC side voltage of the power converter; issuing, by the controller, a second command to open the first switch, the third switch, and the fourth switch; in response to the fourth switch opening: issuing, by the controller, a third command to close the first switch; and issuing, by the controller, a fourth command to restore an AC side voltage of the power converter to an AC reference value.

Abstract: An axial fuel stage (AFS) injector includes a mixing member and a high pressure (HP) air-fuel injection member. The injection member includes HP air-fuel injectors including an inner wall defining an inner air jet and an outer wall surrounding and concentric with the inner wall and defining an outer air jet loop therebetween. A spacer member spaces the walls. A plurality of fuel injector passages extends from the outer wall through the spacer member and the inner wall to the inner air jet. Each fuel injector passage has an end including a fuel injector directed into the inner air jet. A fuel plenum is configured to deliver a fuel to each of the fuel injectors. The inner air jets and the air jet loops are configured to direct a high-pressure air flow from a high-pressure air source with the fuel into the inlet of the mixing member.

Abstract: A foreign material exclusion system for positioning within a casing of a turbine to catch any foreign material during maintenance of the turbine. The foreign material exclusion system may include a fabric sleeve with a semicircular shape and a number of poles attached to the sleeve to maintain the sleeve in place within the turbine casing.

Abstract: A system includes a modular exhaust collector configured to be arranged in a first orientation or a second orientation. The modular exhaust collector is configured to receive an exhaust flow along an inlet axis, to direct the exhaust flow along a first direction through an outlet when in the first orientation, and to direct the exhaust flow along a second direction through the outlet when in the second orientation. The modular exhaust collector includes an exhaust passage to receive the exhaust flow, a plurality of compressor discharge (CD) ports, a plurality of flow ports, a bottom face opposite the outlet with a first drain, and a first side wall with a second drain between the bottom face and the outlet. Each CD port is disposed a first radial distance from the inlet axis, and each flow port is disposed a second radial distance from the inlet axis.

Abstract: A system includes a gas turbine engine, including a compressor, a combustor, and a turbine. The system includes an intercooler configured to receive a discharge air from the compressor and to cool the discharge air. The system includes a first conduit to divert a portion of the cooled discharge air from the intercooler or a location downstream of the intercooler to a bearing located within the turbine to pressurize the bearing to block leakage of fluid from the bearing.

Abstract: A system includes an absorber having a vessel with a solvent inlet, a solvent outlet, a gas inlet, a gas outlet, and an interior volume configured to mix a gas and a solvent, wherein the absorber is configured to absorb an undesirable gas from the gas into the solvent. The system also includes at least one heat pipe coupled to the vessel, wherein the at least one heat pipe is configured to transfer heat away from at least one position along the absorber.

Abstract: A water recovery system including a first fluid stream inlet providing for the flow of a first fluid stream, such as a humidified inlet gas, into the system and a second fluid stream inlet providing for the flow of a second fluid stream, such as a gas having a temperature greater than the humidified inlet gas, into the system. At least one contactor is in fluid communication with the first fluid stream inlet and the second fluid stream inlet.

Abstract: A method of controlling a bipole power transmission network. The method includes receiving a command for synchronising first and second AC networks; measuring a first AC bus voltage of a first AC bus and a second AC bus voltage of a second AC bus, the measured voltages being defined by voltage magnitudes and phase angles; adjusting a phase angle and a magnitude of a voltage of the first and second power converters based on the measured voltages; issuing a command to electrically connect the first AC bus with the second AC bus, when: a first phase angle difference of the AC bus voltages is within a first pre-defined range; and a first magnitude difference of the AC bus voltages is within a second pre-defined range; and changing the phase angle of the voltage of the power converters to balance the power between the first and second electrical poles.