Patents Assigned to Hitachi Energy Switzerland AG
  • Patent number: 11366025
    Abstract: A high voltage system including: a high voltage bushing having a bushing body configured to be assembled with a tank filled with a dielectric liquid wherein the bushing body has a cavity, and the bushing includes a dielectric liquid level sensor configured to measure a dielectric liquid level in the cavity, and a temperature distribution determining device configured to determine a heat distribution in the bushing based on the dielectric liquid level measured by the dielectric liquid level sensor.
    Type: Grant
    Filed: February 28, 2020
    Date of Patent: June 21, 2022
    Assignee: HITACHI ENERGY SWITZERLAND AG
    Inventors: Tor Laneryd, Joachim Schiessling
  • Patent number: 11366144
    Abstract: The present invention relates to a device and a method for measurement of electrical signals in an industrial automation and control system. The device comprises an input circuit, configured to receive an electrical input signal (100), scale the electrical input signal by a scaling factor and to set the scaling factor according to a scaling signal (110), an Analog-to-Digital Converter, ADC (220), which is electrically connected to the input circuit, wherein the ADC is configured to convert the scaled electrical input signal (103) into an intermediate digital signal (120), and a first signal path (211), connected to an digital end of the ADC, configured to create the scaling signal (110) and to send the scaling signal (110) to the input circuit, wherein, based on the intermediate digital signal of a sample period and the scaling factor of the sample period, the scaling factor for a subsequent sample period is set.
    Type: Grant
    Filed: February 24, 2020
    Date of Patent: June 21, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Francesco Rizzo, Calogero Bona
  • Patent number: 11362541
    Abstract: Technologies for dynamic forecasting, aggregation, and validation may include circuitry configured to collect data indicative of power flows at multiple locations in an electrical grid, to receive one or more parameters for generation of a customized forecast indicative of predicted power flows associated with one or more of the multiple locations over a defined time period, to select a subset of the collected data that satisfies the one or more parameters, to produce a model to predict power flows in the electrical grid associated with the one or more locations, to determine whether the model is validated by determining whether a predicted production of power minus predicted losses is within a predefined range of a predicted consumption of power at the one or more locations, and to produce the customized forecast of predicted power flows associated with the one or more locations for the defined time period.
    Type: Grant
    Filed: May 7, 2019
    Date of Patent: June 14, 2022
    Assignee: HITACHI ENERGY SWITZERLAND AG
    Inventors: Thomas Fox, Karl Eric Harper
  • Patent number: 11360137
    Abstract: A method and device can be used with a power transmission line. Pre-fault voltage and current phasors and during-fault voltage and current phasors for each of first, second, and third terminals are determined based on disturbance records. Using an assumed faulted section, values for a propagation constant of each section, a surge impedance of each section, and a fault location parameter are computed. The computing is based on simultaneously solving pre-fault and during-fault objective functions for the assumed faulted section with the computed pre-fault and during-fault voltage and current phasors. The pre-fault and during-fault objective functions are formulated based on equating junction voltages determined from two of the terminals, conservation of charge at the junction, and equating fault location voltages determined from one terminal and the junction. The values determined for the propagation constant, the surge impedance, and the fault location parameter can be compared with predefined criteria.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: June 14, 2022
    Assignee: HITACHI ENERGY SWITZERLAND AG
    Inventors: Swaroop Gajare, Obbalareddi Demudu Naidu, Neethu George, Sachin Srivastava, A. V. Sai
  • Patent number: 11360120
    Abstract: A method and system for acquiring, manipulating and displaying inspection data obtained by sensors associated with submersible inspection vehicle within a housing having a liquid medium is disclosed in the present application. A control system including an electronic controller is operably coupled with the inspection vehicle and is configured to display data transmitted from the sensor and overlay input data from an operator on the display to facilitate real time analysis during the inspection event.
    Type: Grant
    Filed: June 7, 2019
    Date of Patent: June 14, 2022
    Assignee: HITACHI ENERGY SWITZERLAND AG
    Inventors: Gregory A. Cole, William J. Eakins, Daniel T. Lasko, Harshang Shah, Thomas A. Fuhlbrigge, Luiz V. Cheim, Poorvi Patel, Biao Zhang, Saumya Sharma, Sanguen Choi
  • Patent number: 11362008
    Abstract: The present invention provides a power semiconductor module, including a substrate having an electric insulating main layer being provided with a structured top metallization and with a bottom metallization, wherein the top metallization is provided with at least one power semiconductor device and at least one contact area, wherein the main layer together with its top metallization and the at least one power semiconductor device is embedded in a mold compound such that the mold compound includes at least one opening for contacting the at least one contact area, and wherein power semiconductor module includes a housing with circumferential side walls, wherein the side walls are positioned above the main layer of the substrate so that the side walls are only present in a space above a plane through the main layer of the substrate.
    Type: Grant
    Filed: January 8, 2020
    Date of Patent: June 14, 2022
    Assignee: HITACHI ENERGY SWITZERLAND AG
    Inventors: Dominik Trüssel, Samuel Hartmann, David Guillon
  • Patent number: 11355273
    Abstract: A non-liquid immersed transformer including a magnetic core having a winding axis and at least two coil windings wound around the magnetic core along the winding axis. One or more cooling tubes made of dielectric material are arranged inside at least one of the coil windings to cool down the coil winding using dielectric fluid flowing through the dielectric cooling tubes. Each cooling tube is wound continuously forming one or more complete loops around the core.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: June 7, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Antonio Nogues Barrieras, Rafael Murillo, Martín Carlos Roy, Lorena Cebrian, Luis Sanchez Lago
  • Patent number: 11355278
    Abstract: Dry-type transformers with insulating modules are disclosed. Example insulating modules include dielectric screens and supporting blocks. The supporting blocks support the dielectric screens over windings of the transformer. The dielectric screens have first substantially even portions configured to adapt in spaces defined by corresponding cylindrical barriers arranged between first and second windings of the transformers and second substantially even portions, transversal to the first portions and to the first windings of the transformers and extending outwards from the first portions and beyond the supporting blocks. The dielectric screens partly extend around a winding.
    Type: Grant
    Filed: May 30, 2018
    Date of Patent: June 7, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Antonio Nogués Barrieras, Carlos Roy Martín, Lorena Cebrián Lles, Rafael Murillo, Luis Sánchez Lago, Rahul R. Shah
  • Patent number: 11356323
    Abstract: A method is provided for configuring communication of data points from producers of data points of an industrial automation control system, power distribution system, power generation system, and/or power transmission system to a consumer of data points. The method includes receiving, by a configuration device, information on required data points. The required data points are a subset of all available data points and are the set of data points required by the consumer of data points. The configuration device automatically determines a communication configuration of data points for transmission of the required data points from the producers to the consumer.
    Type: Grant
    Filed: June 5, 2020
    Date of Patent: June 7, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Theo Widmer, Thorsten Schumann
  • Patent number: 11355925
    Abstract: A neutral arrangement is provided for a converter station of a direct current power transmission system that includes a first converter. The neutral arrangement includes surge arrestors and a group of neutral buses. Each surge arrestor is connected between a neutral bus and ground. The neutral arrangement includes a high voltage insulation zoom area having a first group of surge arrestors and a low voltage insulation zoom area having a second group of surge arrestors. The surge arrestors in the first group have a first arrestor reference voltage and the surge arrestors in the second group have a second arrestor reference voltage that is lower than the first arrestor reference voltage.
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: June 7, 2022
    Assignee: HITACHI ENERGY SWITZERLAND AG
    Inventor: Ying-Jiang Hafner
  • Patent number: 11349384
    Abstract: Methods of energizing converters, and converter stations thereof, based on a mix of half-bridge (HB) converter cells and full-bridge (FB) converter cells are provided. According to one embodiment, a method for energizing a converter may include establishing a direct electrical connection between DC terminals of a converter, electrically connecting the converter to an AC power source via AC connectors and obtaining, from the AC power source and for a certain period of time, an AC voltage between two electrical phase lines for charging capacitors of the FB cells connected to the two electrical phase lines. Accordingly, the FB cells will be charged to a higher value and they may be controlled for charging capacitors of the HB submodules to at least a minimum voltage required to start switching devices of the HB submodules by drawing power from the AC power source.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: May 31, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Praveen Kumar Barupati, Ying Jiang-Häfner
  • Patent number: 11342095
    Abstract: An insulation material for a DC electrical component. The insulation material includes a thermoset or thermoplastic matrix and a functional filler component. The functional filler component has a non-linear DC conductivity depending on an applied electrical field strength. At least in a temperature range of 0° C. to 120° C., the functional filler component has a bandgap in the range of 2 to 5 eV, and optionally in the range of 2 to 4 eV. Furthermore, a method for producing an insulation material, a use of an insulation material for a high voltage DC electrical component, a DC electrical component comprising the insulation material and the use of a DC electrical component comprising the insulation material in a high voltage DC gas insulated device are suggested.
    Type: Grant
    Filed: October 4, 2019
    Date of Patent: May 24, 2022
    Assignee: HITACHI ENERGY SWITZERLAND AG
    Inventors: Yibo Zhang, JianSheng Chen, Lise Donzel, Pierre Elser, Robin Gremaud, ZhiQiang Tao, Rico Gasparini, Ulrich Straumann, Uwe Riechert
  • Patent number: 11342596
    Abstract: A battery management system for a rechargeable battery is disclosed which includes a control system configured to control, a numerical battery model, including a parametrized electric model; a parametrized thermal model; an aging model configured to provide stress parameters indicative of an instantaneous consumption of an expected lifetime of the battery in dependence on an internal temperature of the battery, and one or more of momentary state of charge, current, voltage and power delivered; updated electric parameters and/or updated thermal parameters based on a chronological sequence of internal temperature as obtained from the parametrized thermal model; a control system settings update unit configured to adapt controller settings based on stress parameters.
    Type: Grant
    Filed: March 16, 2020
    Date of Patent: May 24, 2022
    Assignees: Hitachi Energy Switzerland AG, ABB Schweiz AG
    Inventors: Reto Flueckiger, Timothy Patey, Jan Poland
  • Patent number: 11339763
    Abstract: A method for monitoring turbines of a windmill farm includes: providing a global nominal dataset containing frame data of the turbines of the windmill farm and continuous reference monitoring data of the turbines for a first period in a fault free state, the reference monitoring data including at least two same monitoring variables for each turbine; building a nominal global model based on the global nominal dataset which describes the relationship in between the windmill turbines and clustering the turbines according thereto; assigning the data of the global nominal dataset to respective nominal local datasets according to the clustering; and building a nominal local model for the turbines of each cluster based on the respective assigned nominal local datasets, the nominal local model being built such that a nonconformity index is providable which indicates a degree of nonconformity between data projected on the local model and the model itself.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: May 24, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Moncef Chioua, Ni Ya Chen, RongRong Yu, Yingya Zhou, Yao Chen
  • Patent number: 11336104
    Abstract: A method can be used to perform a state of health (SoH) estimation for a rechargeable battery energy storage system during operation of the rechargeable battery energy storage system. The rechargeable battery energy storage system includes a plurality of parallel strings that are individually controllable. The method includes selecting at least one string from the plurality of parallel strings, placing the selected at least one string into a SoH calibration mode for performing a SoH calibration while concurrently maintaining at least one other string of the plurality of parallel strings in operative mode, and causing the selected at least one string to return to the operative mode after the SoH calibration has been completed for the selected at least one string.
    Type: Grant
    Filed: August 7, 2020
    Date of Patent: May 17, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Jan Poland, Daniel Chartouni, Alexandre Oudalov, James Ottewill, Erald Pjetri
  • Patent number: 11337236
    Abstract: A method for time-slotted scheduling of packets in timeslots between N nodes and K>1 access points in an industrial wireless network, performed by a network controller of the industrial wireless network. The method includes determining the time-slotted scheduling by allocating each timeslot to a respective one of the nodes, wherein each timeslot for each node is divided in K sub-slots, one for each access point, such that in sub-slot k of each timeslot, where 1?k?K, transmission or reception of a packet is made between access point k and the node to which that timeslot is allocated. The method includes providing information to the access points about the determined time-slotted scheduling.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: May 17, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Zhibo Pang, Michele Luvisotto, Xiaolin Jiang, Roger Jansson, Carlo Fischione
  • Patent number: 11335498
    Abstract: Non-liquid immersed transformers and methods of measuring aging degree of the transformers' insulation are disclosed. The transformers comprise a solid insulation inside the conductive coil and one or more floating electrodes in the solid insulation. At least a part of the conductive coil and the one or more floating electrodes may form one or more capacitive elements, respectively. An electrical parameter, e.g. complex permittivity, of the capacitive element is measured and the aging degree is calculated as a function of the electrical parameter measurement.
    Type: Grant
    Filed: February 14, 2019
    Date of Patent: May 17, 2022
    Assignee: HITACHI ENERGY SWITZERLAND AG
    Inventors: Luis Sánchez Lago, Carlos Roy Martín, Rafael Murillo, Lorena Cebrián Lles, Antonio Nogués Barrieras
  • Publication number: 20220148826
    Abstract: The present invention relates to a method and a monitoring system, for monitoring a vacuum on-load tap changer. The tap changer includes a housing with insulating fluid, a diverter switch inside of the housing and including at least one movable contact and at least two vacuum interrupters, and at least one pressure sensor which measures the pressure in the housing. The method, which is performed by a processing circuitry in the system, includes determining a pressure signature, including two succeeding peaks within a time interval, continuously measuring the pressure, detecting when the measured pressure shows the pressure signature, determining, based on the measured pressure within the pressure signature, the time between the first rise in pressure and the second drop, and setting the determined time to represent the switch time of the diverter switch.
    Type: Application
    Filed: May 18, 2020
    Publication date: May 12, 2022
    Applicant: Hitachi Energy Switzerland AG
    Inventors: Bengt-Olof STENESTAM, Lars JONSSON
  • Patent number: 11327123
    Abstract: A method includes detecting a fault in a grid coupled to a distribution power network, the distribution power network comprising a distribution feeder, a plurality of distributed energy resources (DERs) coupled to the distribution feeder and a reference point of applicability (RPA) associated with the plurality of DERs, and in response to detecting the fault, determining an error voltage at the RPA, converting the error voltage into an error signal, broadcasting the error signal to the plurality of DERs, and based on the error signal, reducing the error voltage at the RPA by injecting a plurality of currents from the plurality of DERs to the distribution feeder.
    Type: Grant
    Filed: September 28, 2020
    Date of Patent: May 10, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Mehmet H. Cintuglu, Dmitry Ishchenko
  • Patent number: 11327105
    Abstract: A device can be used with a power transmission system that includes three section that are connected at a junction, each section being from a corresponding. An input interface receives measurements of voltages and currents carried out at one or more of the first terminal, the second terminal and the third terminal or positive sequence voltage and current phasors obtained from the measurements of voltages and currents carried out at one or more of the first terminal, the second terminal and the third terminal. A phasor calculation module calculates positive sequence voltage and current phasors from the measurements of voltages and currents carried out at a terminal of the power transmission system. A fault locator obtains the fault location based on the section with the fault, the positive sequence voltage and current phasors obtained for each terminal, and the positive sequence line impedance parameters of each section.
    Type: Grant
    Filed: June 14, 2018
    Date of Patent: May 10, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Neethu George, Obbalareddi Demudu Naidu, Sachin Srivastava, A. V. Sai