Abstract: The invention supports and promotes testing of Substation Automation (SA) functions involving intermediary Logical Nodes (LN) in SA systems of operating substations, specifically with minimized impact on the substation and/or the SA system and without having to completely deactivate or isolate entire parts of the substation. A test is set up by defining at least one input LN where the test scenario input signals will be applied, and by determining output LNs where expected output values shall be observed. Based on the data flow between LNs as defined in the System Configuration Description (SCD) file a test preparing tool automatically determines all intermediary LNs logically arranged between these input and output LNs. The intermediary LNs and the IEDs that are affected by the function test are identified and subsequently marked for “test” or “simulation” mode.

Abstract: Rotating machines and rotors therefor are disclosed. The bearings may be magnetic bearings configured to magnetically levitate the rotor. The rotors may include a hollow fiber-reinforced composite shaft and a magnetic bearing rotor core disposed on the shaft and configured for use with the magnetic bearing. In some examples, the rotating machines may be electrical machines.

Abstract: Unique systems, methods, techniques and apparatuses of a gate drive system are disclosed. One exemplary embodiment is a drive circuit electrically coupled to a main switching device including a first inverter, a first inverter controller, an air core transformer, at least one rectifier, at least two smoothing capacitors, a current buffer stage, and a detection circuit. The first inverter controller is structured to operate the first inverter in a first mode and a second mode. The air core transformer is structured to receive the converted AC power from the first inverter. The detection circuit is structured to detect a first mode of the first inverter and a second mode of the first inverter, and operate the current buffer stage based on a detected first mode of the inverter and a detected second mode of the first inverter.

Abstract: A method and control system are disclosed for optimizing load scheduling for a power plant having one or more generation units. The method can include analyzing the operating state of one or more components of generation units in terms of one or more risk indices associated with one or more components of generation units; updating an objective function that reflects the state of one or more components of generation units; solving the objective function to optimize a schedule of the one or more generation units and operating state of one or more components of generation units; and operating the one or more generation units at optimized schedule and operating state.

Abstract: A double-stage inverter apparatus for energy conversion systems (FIG. 1) and control method thereof, adapted to manage the operations of the on-board booster module so as to optimize the overall electrical efficiency of the system. Furthermore, the method according to the present invention allows the operations of said double-stage inverter to be managed when there is only one input channel, when there are multiple input channels called to operate both in parallel and also when there are multiple input channels called to operate independently from each other.

Abstract: A medium voltage circuit breaker for the use in high pressure environments has a vacuum interrupter with a fixed contact side and a movable contract side with a movable rod, and a drive in pressure tight insulating housing, electrical terminals to the vacuum interrupter integrated into the pressure housing, and a further pressure tight housing attached pressure tightly at the insulating housing at the movable contact side of the vacuum interrupter with the movable rod, and that the inner volume of the insulating pressure tight housing gastightly separated from the inner volume of the further pressure tight housing by a bellows, through which the movable rod is guided through and mechanically coupled to a drive, which is arranged inside the further housing.

Abstract: An electrical connection for medium and high voltage switchgears, with an electrical terminal of a switchgear, wherein an electrical contacting surface of the electrical terminal is electrically connected with a contacting surface of an external electrical connector part via a connecting system. In order to ensure a low resistance electrical connection, the connecting system can have a female screw thread in a stud hole of the electrical terminal as well as in a stud hole of the external connector part, and a stretch bolt with male screw threads at each opposite ends, screwed into the female screw thread of the electrical terminal with one end of the stretch bolt, and into the female screw thread of the external connector part at the other end of the stretch bolt.

Abstract: A method and system for applying a liner material to a contoured surface, such as an exposed rock face in an underground hard rock mine, is disclosed. Locations of a plurality of spatially distributed surface grid points on the contoured surface may be detected so as to generate a representative topographical profile of the contoured surface. Based on the plurality of surface grid points, a spray path for a liner application device configured to emit a spray of the liner material may be determined. In some cases, the spray path may have a trajectory that follows the topographical profile of the contoured surface offset therefrom within a spray range of the liner application device. Liner material may then be sprayed onto the contoured surface while controlling the liner application device to undertake at least one pass of the spray path.

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 connected with respective others of said power units in each phase output line and are connectable to said multi-phase AC load.

Abstract: Among other things, a distribution transformer and a technique for regulating voltage are provided for herein. The distribution transformer comprises at least three windings and at least two ferromagnetic cores. The distribution transformer may also comprise a power electronic AC-AC converter operable to maintain the input voltage and current of the distribution transformer substantially in phase and/or to reduce fluctuation in the output voltage of the distribution transformer in the event of an increase or decrease in the input voltage, for example.

Abstract: A passive electronic fuse for protecting a DC application in the event of a fault includes a first leg including a first winding of a mutual inductor and a switch device connected in series, a second leg including a second winding of the mutual inductor. The first leg and the second leg are connected in parallel and a self-inductance of the second winding is lower than a self-inductance of the first winding. The second leg further includes a capacitor connected in series with the second winding of the mutual inductor, and the switch device is a thyristor or a switch device with switching properties of a thyristor.

Abstract: Embodiments are generally based on employing a power transmission line in a HVDC link to provide auxiliary power to one of the ends of the HVDC link for facilitating a black start thereof when the HVDC link is de-energized, i.e. when at least one of the HVDC converter stations is de-energized and there is no transmission of power between inverter and rectifier HVDC converter stations on each side of the HVDC link. A relatively small amount of power can be conveyed towards one of the HVDC converter stations via the power transmission line so as to provide power to any auxiliary system(s) of the converter station, for example prior to a black start of the converter station being carried out.

Abstract: A computer-implemented system and method for predictive and diagnostic analysis of an electrical transmission, generation and distribution asset health includes a computer with a non-transient computer readable medium able to receive data regarding an asset, its components, component subsystem and parameters related thereto. Instructions stored on the non-transient computer readable medium execute instructions that predictively calculate overall asset health and also calculated the states of subsystems and component parameters, providing a diagnostic of the causes of poor asset health.

Abstract: A switching system for breaking a current, including a contact arrangement having a first and second terminals, a resonance circuit connectable across the contact arrangement, In the closed state the first switch enables current to flow through the resonance circuit in a first flow direction and into the contact arrangement in a direction opposite to a contact arrangement arc current flow direction. A second switch connected to the resonance circuit and to the second terminal. In the closed state the second switch enables current to flow through the resonance circuit in a second flow direction opposite to the first flow direction.

Abstract: The method is provided for manufacturing a perforated sheet-like high-voltage insulating spacer for a high-voltage component, which component comprises a field grading condenser core with the spacer which is wound in spiral form around an axis, with electrically conducting layers which are inserted between successive windings of the spacer, and with a polymeric matrix which penetrates the spacer and which embeds the spacer and the layers. The method comprises at least steps as follows: an electrically insulating tape, and the patterned tape is expanded at right angle to the cutting lines in order to form a spacer with a perforated three-dimensional lattice structure. The combined effect of cutting a tape and expanding the cutted tape allows the formation of spacers with a manifold of sizes which exceed the size of the tape in function of manufacturing parameters, in particular in function of the configuration of the pattern and the magnitude of the expansion.

Abstract: A technology for delivering an audible notification from a process control system in a control room environment, where the delivery is made by one or more first speakers having a first coverage for audible notifications and one or more second speakers having a second coverage for audible notifications. A determination if the location of an operator is covered by the first coverage is made. The audible notification is delivered by the one or more first speakers if it is determined that the location of the operator is covered by the first coverage. The audible notification is delivered by the one or more second speakers if it is determined that the location of the operator is not covered by the first coverage.

Abstract: A manual is disclosed for a frequency converter and a method, apparatus and a computer program product are disclosed for configuring a frequency converter. The manual can include a data storage storing operational configuration information of the frequency converter; wherein the configuration information is encoded to the data storage to be wirelessly readable from the data storage. The configuration information is obtained from the manual by wireless reading, and installed to the frequency converter by transmitting the obtained configuration information over a wireless connection.