Abstract: Systems and methods of determining a communication time delay in electrical power systems are provided. In one embodiment, 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 remote terminal and the local terminal.

Abstract: A gas turbine component, for forming part of a stage of the turbine, operable to change cooling scheme, includes an airfoil profiled section, a cooling passageway, film holes and interchangeable connectors. The profiled section includes pressure and suction sides joined together at chordally opposite leading and trailing edges. The cooling passageway extends between the pressure and suction sides along the leading edge to enabling cooling fluid to flow therefrom. The film holes are configured on the cooling passageway to enable the flow of a portion of the cooling fluid to a portion of the profiled section. The interchangeable connectors configured to the cooling passageway, one at a time, to change the cooling scheme. An insert may also be provided to close and open the film holes.

Abstract: There is provided systems, apparatus, and methods for locating a fault in a plurality of windings of a transformer. In one embodiment, the apparatus may include: a measurement device configured to measure electrical flow parameters of the transformer when the transformer is in an online mode; and a fault location determination unit configured to determine electrical flow parameters of the windings from the measured electrical flow parameters of the transformer, wherein the fault location determination unit is configured to process the determined electrical flow parameters of the windings to determine the location of the fault in the windings.

Abstract: The present application provides a method of evaluating valve creep damage in a turbine by a data acquisition system. The method may include the steps of receiving a number of operating parameters from a number of sensors including steam temperatures and steam pressures about the valve over time, generating a design material model for the valve, determining an indicator for consumed creep lifetime based on the steam temperature and steam pressures about the valve over time as compared to the design material model, and altering one or more of the operating parameters and/or initiating repair procedures based upon the consumed creep lifetime indicator.

Abstract: A method of determining a remaining life in a component and a rotatable machine system are provided. The rotatable machine system includes a plurality of valves coupled in flow communication with a rotatable machine of the rotatable machine system, a plurality of sensors configured to receive operating parameters associated with the rotatable machine and the plurality of valves, and an online valve lifetime counter (OVLIC), including a processor communicatively coupled to the plurality of sensors. The OVLIC is configured to determine a trend of differential temperature across a body of a valve of the plurality of valves, convert the trend of differential temperature to a stress induced into the valve over time, and determine life remaining in the valve based on a total damage of the valve wherein the total damage is a function of creep damage and fatigue damage to the valve.

Abstract: A method and a turbine part having a coating with a matrix layer that includes a high temperature resistant hydrophobic polysiloxane filler, wherein the coating has superior mechanical strength and temperature resistance.

Abstract: A method of operating a turbine unit, wherein recirculated exhaust gas is contacted with a cooling and absorption liquid in a packed bed. An exhaust gas treatment system for a turbine unit, wherein an exhaust gas recirculation line comprises a gas cooling and cleaning device having a packed bed for contacting the exhaust gas with a cooling and absorption liquid. A combined cycle power generating system, wherein an exhaust gas recirculation line comprises a gas cooling and cleaning device having a packed bed for contacting the exhaust gas from a gas turbine with a cooling and absorption liquid and wherein water utilized as a cooling medium for condensation of steam originating from a steam turbine, and the cooling and absorption liquid, are passed to a cooling tower.

Abstract: A method for operating a combustion chamber is provided. The method includes obtaining a carbon monoxide reading at an exit of the combustion chamber via a carbon monoxide sensor, and deriving an oxygen set point trim based at least in part on the carbon monoxide reading and a carbon monoxide set point via a controller. The method further includes determining a stability status of the combustion chamber via a combustion stability sensor, and adjusting an oxygen set point of the combustion chamber with the oxygen set point trim based at least in part on the stability status via the controller. The oxygen set point defines a desired oxygen level at the exit of the combustion chamber.

Abstract: The method for monitoring the signal quality of an electrostatic precipitator comprises measuring in real time at least one feature of a primary electric power sent to a transformer of the electrostatic precipitator and/or at least one feature of a secondary electric power sent to the collecting electrodes and discharge electrodes of the electrostatic precipitator, elaborating the at least a measured feature generating an information indicative of the electrostatic precipitation signal quality, providing the information.

Abstract: A burner assembly of a gas turbine comprising: a tubular body defining the flow path for the hot gas of the combustion during the turbine operation; an aperture for a fuel lance; a wearing ring of a sacrificial material configured to correspond to the edge of the aperture; a contacting leg extending from the wearing ring on the tubular body; a pre-tension system configured to contact the contacting leg in order to provide a pre-tension force on the ring.

Abstract: This disclosure relates to systems and methods for estimation of electrical grid parameters. An example system may include a data acquisition module configured to acquire electrical parameters. The electrical parameters can be measured at electrical components of the electrical grid. The electrical components may include at least one transmission line and at least one transformer. The system may include a parameter estimation module configured to analyze the electrical parameters to estimate impedance parameters associated with the electrical components and provide, via a user interface, at least one indication regarding the impedance parameters. The system may further include a line sagging detection module configured to estimate, based on the impedance parameters, at least one line sagging parameter indicative of sagging of the transmission line. The line sagging detection module can be further configured to output at least one indication regarding the sagging of the at least one transmission line.

Abstract: Methods are provided for creating dynamic lists from selected areas of a power system of a utility company. The utility company has an energy management system with a control panel. The energy management system is used to access one or more source displays of a site. Rubber-banding or lassoing is used to create selected areas from at least a portion of the source displays. Lists are created dynamically. Operator defined information is displayed for each element type in a list of network elements from the selected areas that have been rubber-banded or lassoed.

Abstract: There is provided a method of locating a fault in a power transmission scheme. The power transmission scheme includes power transmission sections and a first end connection point, a second end connection point, and at least one intermediate connection point. The method includes (i) measuring first and second end voltage phasors at the first and second end connection points respectively; (ii) obtaining a first set of voltage phasors, which includes the measured first end voltage phasor and includes respective voltage phasors at each of the second and intermediate connection points; (iii) obtaining a second set of voltage phasors, which includes the measured second end voltage phasor and includes respective voltage phasors at each of the first and intermediate connection points; (iv) comparing the first and second sets of voltage phasors to identify the power transmission section or connection point corresponding to the location of the fault.

Abstract: The invention relates to a gas liquid separator, for separating liquid droplets from a gas flowing generally in a main gas flow direction through the gas liquid separator. The gas liquid separator comprises a plurality of plates, mutually parallel and spaced apart to form a flow channel there between. Each plate having a plurality of corrugations wherein at least one of the corrugations has an extrados wing profile shaped camber.

Abstract: This application relates to methods and apparatus for control of voltage source converters. The control apparatus has a reference voltage generator that generates a voltage control signal as part of a voltage control loop. The reference voltage generator may be a DC voltage/power controller operated to regulate DC voltage or power and may generate the voltage control signal based on a feedback DC voltage/power signal and a defined set-point. An overcurrent controller generates a current control signal for modulating the voltage control signal to prevent an overcurrent. The overcurrent controller generates the current control signal as part of a control path that is independent from the voltage control loop. The DC voltage/power controller may thus directly generate a voltage reference and may act to keep the DC voltage substantially constant over the time scale of short term transients, with the overcurrent controller providing current limiting only when required.

Abstract: In the field of gate drivers for switching devices with a gate terminal via which the switching device can be turned on and off, a switching stage (10; 90) comprises first and second input terminals (12, 14) that are connectable in use with corresponding positive and negative terminals (16, 18) of a regulated voltage source (20). The switching stage (10; 80; 90) also includes an output terminal (34) which is connectable in use with a gate terminal (36) of a switching device (28). In addition the switching stage (10; 80; 90) includes a secondary energy storage device (38) that is electrically connected with the first and second input terminals (12, 14) to in use receive and store energy via the regulated voltage source (20).

Abstract: A method for removing NOx from flue gas by SCR includes supplying a reagent for the SCR reaction of NOx into the flue gas, then contacting the flue gas with a catalyst. Supplying the reagent includes supplying a less than stoichiometric amount of reagent, and after contacting the flue gas with a catalyst a final NOx removal step is provided.

Abstract: The invention relates to a device for measuring temperature in a high-voltage portion of a switchgear station, characterised in that it comprises: at least one temperature sensor (21, 22, 23, 24) located at a point on the high-voltage portion of which the temperature is to be monitored, at least one antenna (25) connected to the at least one temperature sensor, a control module (26) located in a low-voltage portion of the switchgear station, and at least one antenna (27) connected to the control module. The at least one temperature sensor (21, 22, 23, 24) is suitable for transmitting a signal representative of a temperature measurement and the control module (26) is suitable for receiving the representative signal, via the antennas, and for processing said signal in order to produce a message.

Abstract: A burner for a combustor of a turbomachine includes a pilot nozzle with inline premixing. The pilot nozzle is formed in an aft end of the burner. An air inlet is formed in a forward end of the burner in fluid communication with the pilot nozzle. A mixing channel extends along the axial direction between the air inlet and the pilot nozzle such that the air inlet is in fluid communication with the pilot nozzle via the mixing channel. An annular fuel plenum extends along the circumferential direction. A fuel port is in fluid communication with the annular fuel plenum and the mixing channel, the fuel port includes an outlet configured to inject fuel into the mixing channel such that a shear flow is induced.

Abstract: There is provided a power supply control apparatus for connection to electrical inputs of an electronic device wherein each electrical input is operatively connected to a power source having a sequencer circuit and a control element, the sequencer circuit including sequencer stage(s). The sequencer circuit selectively receives an indication signal, the sequencer circuit selectively receives a positive indication signal indicative of a voltage supplied to a first of the electrical inputs reaching or passing a predefined voltage threshold, and the sequencer circuit selectively provides a control signal to the control element, the control element triggerable by a positive control signal. Each sequencer stage includes circuit elements, the first selectively receives an input signal and selectively provides an intermediate signal to the second, the second selectively provides an output signal.