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公开(公告)号：US10921386B2
公开(公告)日：2021-02-16
申请号：US16447933
申请日：2019-06-20
发明人： Sandeep Pabbathi , Prabakaran S , Suresh Maturu
摘要： The present disclosure relates to methods and devices for calculating winding currents at a delta side for a transformer. The transformer has two or more windings, with a first winding being a delta connected winding. The method includes obtaining line currents measured with measurement equipment associated with lines connected with the windings. The method further includes calculating zero sequence currents for at least a second winding, from the line currents of a corresponding line. The method further includes calculating zero sequence currents for the first winding, based on the zero sequence currents for at least the second winding, a phase displacement between the windings, and a turns ratio associated with the windings. The winding currents is calculated from the zero sequence currents of the first winding, and the line currents of a corresponding line.
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公开(公告)号：US10916930B2
公开(公告)日：2021-02-09
申请号：US16081444
申请日：2017-03-01
IPC分类号： H02H3/04 , H02H3/32 , H02H7/26 , G01R31/62 , G01R31/327
摘要： In the field of electrical power systems there is provided a method of supervising the operation of a plurality of current transformers that are arranged in respective current transformer within differing protection zones of a multi-phase electrical power system. The method of supervising comprises the steps of: (a) identifying a faulty protection zone within the electrical power system; (b) identifying a faulty current transformer group within the faulty protection zone; and (c) identifying faulty phase(s) within the faulty current transformer group within the faulty protection zone.
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公开(公告)号：US10895566B1
公开(公告)日：2021-01-19
申请号：US16662726
申请日：2019-10-24
发明人： Mark Teepe , Todd Karin , Peter Kiesel , Ajay Raghavan , Jane Shin , Bradley Kittrell , Serena Lee
IPC分类号： G01N33/20 , G01N33/2045 , G01D5/26 , G01R31/62
摘要： A corrosion monitoring system includes one or more objects coupled to respective portions of a transformer tank. The one or more objects are configured to corrode before the respective portions of the transformer tank. At least one optical sensor is coupled to each of the objects. The at least one optical sensor has an optical output that changes in response to strain of the object. An analyzer is coupled to the at least one optical sensor. The analyzer is configured to perform one or more of detecting and predicting corrosion of the transformer tank based on the output of the at least one optical sensor.
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公开(公告)号：US10794964B2
公开(公告)日：2020-10-06
申请号：US15548950
申请日：2016-01-26
发明人： Markus Pütter , Bernd Marte
摘要： To ascertain a parameter of a transformer (40) that has a high voltage side (41) and a low voltage side (43), a test signal generated by a source (13) is impressed on the low voltage side (43). A test response of the transformer (40) is recorded. A leakage reactance and/or a leakage inductance of the transformer (40) is determined by an evaluation device (18) of an apparatus (10) on the basis of the test response of the transformer (40).
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85.发明申请公开(公告)号：US20200309841A1
公开(公告)日：2020-10-01
申请号：US16827077
申请日：2020-03-23
申请人： S&C Electric Company
发明人： Yoav Sharon
摘要： A method for identifying a location of a fault in an electrical power distribution network that includes identifying an impedance of an electrical line between each pair of adjacent utility poles, measuring a voltage and a current of the power signal at a switching device during the fault, and estimating a voltage at each of the utility poles downstream of the switching device using the impedance of the electrical line between the utility poles and the measured voltage and current during the fault. The method calculates a reactive power value at each of the utility poles using the estimated voltages, where calculating a reactive power value includes compensating for distributed loads along the electrical line that consume reactive power during the fault, and determines the location of the fault based on where the reactive power goes to zero along the electrical line.
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公开(公告)号：US10746813B2
公开(公告)日：2020-08-18
申请号：US15563221
申请日：2016-05-20
发明人： Reinhard Kaufmann , Dirk Flax
摘要： A test device is configured for testing a specimen which has an inductor. The test device includes a controllable unit for reducing a current intensity of a current flowing in the inductor.
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公开(公告)号：US10732164B2
公开(公告)日：2020-08-04
申请号：US16217646
申请日：2018-12-12
摘要： A sensor module or system for monitoring a headspace of a transformer can include a sealed chamber configured for coupling and accessing gasses from the headspace of the transformer, a plurality of sensors placed within the sealed chamber which can include a hydrogen sensor and at least a second sensor such as a total combustible gas sensor, a moisture sensor, a pressure sensor, or a temperature sensor. The module or system can include one or more processors coupled to the plurality of sensors where the processors are configured to generate an alarm signal when a combination of the hydrogen sensor and at least the second sensor exceed a predetermined threshold.
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公开(公告)号：US10690729B2
公开(公告)日：2020-06-23
申请号：US16100440
申请日：2018-08-10
申请人： Landis+Gyr AG
发明人： Joe Imfeld , Andreas Rumsch , Patrick Schmid
摘要： The present invention relates to a method of determining a reduction of remaining service lifetime of an electrical device during a specific time period. A measurement system is provided comprising a temperature measurement device, a current measurement device and a voltage measurement device. A temperature value, voltage values and current values are measured by using the measurement device. A harmonic load is determined based on the current values. A reduced maximum operating temperature is determined based on the harmonic load. An amount of transient over-voltages is determined based on the voltage values. A transient aging factor is determined based on the amount of transient over-voltages. A temperature dependent aging factor is determined based on the temperature value and the reduced maximum operating temperature. Finally, the reduction of remaining service life is determined based on the specific time period, the transient aging factor and the temperature dependent aging factor.
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公开(公告)号：US10690643B2
公开(公告)日：2020-06-23
申请号：US16171220
申请日：2018-10-25
申请人： Roger Alan Fenton
发明人： Roger Alan Fenton
摘要： An apparatus senses properties of a fluid. The apparatus has a pipe section, a valve, and an instrument. The pipe section has an envelope, through which a flow of the fluid is coupled between a tank of an electrical power device and a cooling device. The envelope is disposed about a longitudinal axis, and has a penetration disposed laterally, relative to the longitudinal axis. The valve is disposed within the one or more penetrations and has a closed position and an open position. The instrument is operable for the sensing of the fluid properties, and has a probe disposed in contact with the fluid through the valve in the open position.
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公开(公告)号：US20200158790A1
公开(公告)日：2020-05-21
申请号：US16619854
申请日：2018-08-31
申请人： AISIN AW CO., LTD.
发明人： Hideaki KIMURA
摘要： Provided is a diagnostic device for a coil including a voltage application unit applying an impulse voltage to the coil; a response voltage detection unit detecting a response voltage from the coil with respect to the impulse voltage; an index calculation unit calculating a determination index indicating an electrical feature of the coil based on the response voltage; and a determination unit determining whether there is an abnormality in a target coil to be diagnosed by comparing the determination index of a reference coil that is the coil that is normal and the determination index of the target coil. At least one of a zero cross point at which the response voltage intersects with a reference voltage and a peak voltage on a positive side and a negative side of the response voltage is used as the determination index, in addition to a circuit constant of the coil.
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