Abstract: An arrangement and a method for reactive power compensation in connection with a power transmission line. The arrangement includes at least one transformer and at least one reactive power compensator connected to the low-voltage side of the transformer and at least one adapter reactor, the adapter reactor being connected in series with the transformer so that the reactive power compensator is connected to the power transmission line via the transformer and the adapter reactor.

Abstract: A method and an apparatus for dynamic signal switching with multiple measurement sources, for a merging unit in an electrical power system, said merging unit receiving at least two input signals from at least one current transformer measuring the same physical primary quantity. The method comprises a step of outputting from said merging unit, in a real-time mode, a digitized output stream of sampled values with the truest representation of the physical primary quantity, based on the actual values of the input signals.

Abstract: A system tool that provides dispatchers in power grid control centers with a capability to manage changes. Included is a user interface and a plurality of scheduler engines. Each scheduler engine is configured to look ahead at different time frames to forecast system conditions and alter generation patterns within the different time frames. A comprehensive operating plan holds schedules generated by the plurality of scheduler engines. A relational database is coupled to the comprehensive operating plan. Input data is initially received from the relational database for each scheduling engine, and thereafter the relational database receives data from the scheduling engines relative to forecast system conditions.

Abstract: Aspects of a multi-level electrical distribution control system associated with an electrical distribution grid are disclosed. Data access and processing across the multi-level control system and the electrical distribution grid can provide improved utilization of energy within the electrical distribution grid. Further, dynamic reconfiguration of the electric distribution grid can be based distributed processing and access to information relating to the electrical distribution control system or electrical distribution grid. An encapsulated DNNC data element is disclosed as an efficient and secure means of accessing data across the multi-level electrical distribution control system or the associated electrical distribution grid.

Abstract: The subject specification comprises a generalized grid security platform (GGSP) that can control power distribution and operations in a power transmission and distribution grid (PTDG) in real or near real time. The GGSP can receive data from one or more data sources, including a PMU(s) or an IED(s), which can obtain power system related data and provide at least a portion of such data to the GGSP at a subsecond rate. The GGSP can correlate data from the data sources based at least in part on a temporal, geographical, or topological axis. The GGSP can analyze the data, including performing predictive analysis, e.g., via simulation, root cause analysis, post mortem analysis, or complex event processing, when desired, to facilitate identifying a current or predicted future state of the PTDG, a cause or source of an abnormal condition, or a remedial action execution plan, new operation or maintenance guidance, etc.

Abstract: The method for detecting single-phase grounding fault based on the harmonic component of residual current is provided, in which collecting and calculating the phase differences of third harmonic waves relative to the fundamental wave of the residual current in the feeder line, and judging if the phase differences of the residual current in the feeder line is into a threshold range, and judging if there is a suspected grounding fault, and confirming the fault event by judging the duration and the generated times of the suspected grounding fault. Another method for detecting single-phase grounding fault based on the harmonic component of residual current is provided, in which the residual current of neutral point is used.

Abstract: The invention relates to an interrupting chamber for a high-voltage circuit breaker of preferably greater than at least 52 kV adapted to break all currents of value less than or equal to the short-circuit interrupting capacity of the circuit breaker, including asymmetric currents comprising an arc contact, an insulating arc blow-out nozzle having a through hole adapted to be blanked off by a valve, an insulating component which forms two channels, one of which is located between the insulating component and the arc contact, and wherein the hole is in communication with the channel.

Abstract: Determination of information relating to a location of an electrical fault in an electrical energy distribution system based on phasor information is disclosed. A component can receive phasor information and electrical energy distribution system information. The system can determine a distance factor based on the phasor information. The distance factor can be employed to determine fault location information. A set of fault location information can be generated. Fault location information can be corrected for fault characteristics. Equivalent circuit models can be employed in determining the distance factor. Fault locations can be validated to facilitate generating subset of fault location information. Access to fault location information can be facilitated.

Abstract: Methods are provided for assessing potentially compromising situations of a utility company. One or more source displays of a site are accessed. A fly-out or data lensing is used to bring forward a portion of the source displays. The fly-out or data lensing is used to draw attention to a potentially compromising situation and direct the operator's attention without loosing perspective of a whole power system of the utility company.

Abstract: An embodiment of the invention relates to an electrical switchgear unit, in particular a high voltage switchgear unit. A housing is present, which is provided with a housing wall which contains a bore. A corrugated tube is present, which is coupled to the bore. For this purpose, the corrugated tube is plugged into the bore. Between the corrugated tube and the bore, an annular gap is located, in which an O ring is arranged, which is plugged onto the corrugated tube.

Abstract: Described is a high-voltage circuit breaker provided with two opposite-arranged arcing contacts, which are surrounded by an insulating nozzle. Furthermore provided are two main contacts, arranged opposite each other outside of the insulating nozzle, with respectively one of these contacts being assigned to one of the two arcing contacts. The high-voltage circuit breaker is provided, in at least one embodiment, with at least one device for diverting an insulating gas flow from the region between the two arcing contacts, wherein a respective insulating gas flow is conducted outside of the insulating nozzle and in the direction toward the main contacts.

Abstract: A device for measuring current and/or voltage in a high voltage wire can be provided in a folding insulator. The mechanically folding insulator device can include a plurality of insulated sections. Pairs of insulated sections are coupled together by a link which allows for mechanical folding of said insulator device. The insulated sections of the folding insulator device have a cavity formed therein which contains an optical fiber surrounded by an insulative material.

Abstract: A device and method of protecting a link in a medium, high, or very high voltage power network, with current and voltage transformers and trip circuits being disposed on the link. The protection device includes a mechanism to directly connect to a power supply, to the current and voltage transformers, and to the trip circuits, via analog links, and a mechanism to convert from analog to digital that is connected to a central processor unit via a digital link, the analog-digital conversion mechanism including an integrated test plug socket function.

Abstract: Aspects of state estimation for cooperative electrical grids are disclosed. State estimation of a local electrical grid can be based on a local grid model and local electrical grid information. The local state estimation can reflect interactions and interconnections with other electrical grids by determining state estimation solution information based on the local grid model, local electrical grid information, and remote state estimator solution information associated with the other electrical grid. As such, a local state estimator can be configured to receive and employ remote state estimator solution information. This can be in addition to the more conventional technique or receiving a remote grid model and remote electrical grid information to estimate the conditions of the remote electrical grid. Further, state estimation solution information can be incremental to further reduce the amount of information to be transferred and the time needed to accomplish transmission of the information.

Abstract: Aspects of interaction with multidimensional information for an energy system are disclosed. The use of multidimensional information in a graphical user interface can facilitate efficient communication of information related to energy systems. Energy system information can be classified. A multidimensional information interface can include a plurality of rows and a plurality of columns populated with tokens representing energy system information, based on the classification of the energy system information. The tokens can be selectable tokens such that selection of tokens can be related to accessing detailed information related to the token. In some embodiments, indicators, particularly visual indicators, can be employed to convey additional information, such as counts, selection status, sums of rows or columns, etc. Further, augmentation effects can be employed to facilitate access to an additional layer of information, such as freshness of a token, acknowledged tokens, etc.

Abstract: A method is provided for merging different load forecasts for power grid centers. Area load forecasts are accepted from load forecast engines. A relational database saves load forecast engine data. A comprehensive operating plan integrates individual load forecasts into a composite load forecast to present a comprehensive, synchronized and harmonized load forecast.

Abstract: Systems, methods, and apparatus for pre-processing of electrical power grid data for event-driven automatic generation control (AGC) are presented herein. An AGC application can determine AGC output data, for output to a unit controller that controls power generator(s) related to an electrical power grid, based on current values of a subset of electrical power grid data associated with the electrical power grid that has changed since a prior determination that the electrical power grid data has changed. A pre-process component can determine the subset of the electrical power grid data that has changed since the prior determination, and send the current values of the subset of the electrical power grid data to an area control error component. An event-driven component can determine information in response to an event trigger generated based on processing the current values of the subset of the electrical power grid data received from the pre-process component.

Abstract: A method is provided for merging different load forecasts for power grid centers. Area load forecasts are accepted from load forecast engines. A relational database saves load forecast engine data. A comprehensive operating plan integrates individual load forecasts into a composite load forecast to present a comprehensive, synchronized and harmonized load forecast.

Abstract: A method of controlling at least one voltage converter having a plurality of cells in series, comprising an AC part and a DC part, characterized in that the AC input voltage (Vei) of each cell is determined directly by the use of a high speed current control loop relating to the AC part and a lower speed voltage control loop relating to the cells, the method including choosing the following voltage control law: ? i = C i 2 ? ( 2 R pi ? C i ? Z i + ? ? t ? Z i ? ? _ ? ? ref - K 1 ? Zi - K 2 ? Zi ? sign ? ( E Zi ) ) where: K1zi and K2zi are positive adjustment gains; Ci is the continuous capacitance of the capacitor Ci of each cell; Rpi is the losses associated with each cell; Zi—ref is the reference value of Zi=(UDCi)2, UDCi; being the direct voltage across the capacitor Ci; and EZi is such that EZi=Zi?Zi—ref.

Abstract: Techniques for controlling dispatch of electric vehicles (EVs) to perform vehicle-to-grid regulation of power of an electric grid are presented. An aggregator component can individually control transitioning respective EVs of a set of EVs between a charging state and a not-charging state. The aggregator component includes a dispatch controller component (DCC) that can employ a defined dispatch algorithm for EVs to facilitate enabling the DCC to perform unidirectional regulation. The DCC can switch EV charging stations on and off using remote switches to meet a system regulation signal. The DCC can use the dispatch algorithm to make determinations regarding which EV to switch using charging priorities, in accordance defined power regulation criterion(s). The aggregator component can reduce communication signals used to adjust dispatch by sending switching signals to only those EVs of the set of EVs that are changing their charging state at a given time.