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公开(公告)号：US20240329095A1
公开(公告)日：2024-10-03
申请号：US18620137
申请日：2024-03-28
Applicant: CHAUVIN ARNOUX
Inventor： Jerome ADAM , Philippe LEGROS
CPC classification number: G01R15/185 , G01R27/18 , G01R31/52
Abstract: A single-torus ohmmeter for measuring a loop impedance Zx, includes a single transformer having a primary winding of Np coils and a secondary winding of a single coil forming a measurement loop of impedance Zx, in which, to compensate for a stray induction produced by a DC leakage current circulating in the measurement loop without canceling a measurement current Ip generating an alternating induction of constant average value for the measurement of the loop impedance Zx, the transformer includes a second secondary winding of Na coils whose output voltage Ub is delivered to a processing module providing a voltage intended to be added to an alternating measurement voltage Vp in an adder delivering the current to be injected into the primary winding after passage through a voltage-current converter supplying current to the primary winding via a shunt resistance.
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公开(公告)号：US12105128B2
公开(公告)日：2024-10-01
申请号：US18076647
申请日：2022-12-07
Applicant: Bender GmbH & Co. KG
Inventor： Dennis Haub , Wolfgang Hofheinz
CPC classification number: G01R27/18 , G01R31/2827
Abstract: A method and a device for impedance monitoring for a single-phase or multiphase, ungrounded power supply system. The method comprising the following steps: measuring a complex impedance against ground simultaneously for each active conductor using a measuring device; calculating a complex touch current for each active conductor; testing in the computing unit whether the corresponding complex touch current exceeds a settable body-current threshold value; generating a switch signal in the computing unit upon the body-current threshold value being exceeded; and controlling a switch element using the switch signal for shutting off or isolating the power source.
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3.发明公开公开(公告)号：US20240319251A1
公开(公告)日：2024-09-26
申请号：US18679716
申请日：2024-05-31
Applicant: ESA Elektroschaltanlagen Grimma GmbH
Inventor： Stephan Rathsmann
CPC classification number: G01R31/086 , G01R27/18
Abstract: The present invention relates to a method for insulation monitoring with an insulation monitoring device and insulation fault location without a testing current generator for unearthed electrical power supply networks, comprising
A) providing a permanent measuring voltage between the mains conductor (60) and earth (80) and feeding in a measuring current by means of an insulation monitoring device (61),
B) determining the measuring currents by means of at least one current transformer (64) arranged at each mains outgoing circuit (79),
characterised in that the method further comprises
C) determining the total measuring current and the proportional measuring currents in the mains outgoing circuits (79) by means of an insulation monitoring device (61),
D) evaluating the measuring currents detected, wherein
E) the measuring current of the insulation monitoring of the entire network is also used for insulation fault location in the individual circuits of the network, and
F) the ohmic insulation resistance (69) and the capacitive reactance (65) of each mains outgoing circuit (79) are determined and analysed from the variation over time of the measuring current of each current transformer (64) and the measuring voltage of the insulation monitoring device (61).
The present invention relates to a device for insulation monitoring with an insulation monitoring device and insulation fault location without a testing current generator for unearthed electrical power supply networks.-
公开(公告)号：US12019107B2
公开(公告)日：2024-06-25
申请号：US17812394
申请日：2022-07-13
Applicant: Megger Instruments Ltd
Inventor： Stanislaw Zurek , Jeffrey Jones , Freddie Chin
Abstract: Loop resistance is measured in a live-earth conductor loop comprising a residual current device powered by an alternating current mains supply. A measurement circuit having a low-pass filter characteristic arranged to substantially remove signal components at the frequency of the alternating current mains supply is used to measure, in a first period, a voltage across live and earth conductors of the live-earth conductor loop to determine a first voltage. A current application circuit is used to apply a unipolar test current having a magnitude below a trip current value of the residual current device for a second period and the measurement circuit is used to measure a second voltage between the live and earth conductors. Based on a difference in test current between the first and second periods and a difference in voltage between the first voltage and the second voltage, the resistance of the live-earth conductor loop is calculated.
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公开(公告)号：US11959975B2
公开(公告)日：2024-04-16
申请号：US18122312
申请日：2023-03-16
Applicant: Bender GmbH & Co. KG
Inventor： Carsten Hartmann
CPC classification number: G01R31/52 , G01R27/18 , G01R27/2605 , G01R31/08
Abstract: A method and monitoring device for selectively determining partial insulation resistance and partial system leakage capacitance of an outgoing line in a branched ungrounded power supply system monitored using an insulation monitoring device actively superposing a measuring alternating voltage on the ungrounded power supply system. Using an equivalent circuit diagram of the branched ungrounded power supply system as a basis, the partial insulation resistance having the current/voltage ratios applicable in linear systems are derived from the known measuring voltage and the inner resistance of the insulation monitoring device and from the total insulation resistance and the stationary partial current measured in the corresponding outgoing line and in the settled state. To calculate the partial system leakage capacitance, the temporal derivative of the measured non-stationary conductor-to-ground voltage is evaluated in conjunction with the non-stationary partial current and the previously determined partial insulation resistance.
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Patent Agency Ranking
公开(公告)号：US11959951B2
公开(公告)日：2024-04-16
申请号：US17764397
申请日：2020-09-21
Applicant: RENAULT s.a.s.
Inventor： Houssem Halalchi , Nicolas Vaflard , Pierre-Mikael Viollin
CPC classification number: G01R27/18 , B60L3/0069 , G01R27/08 , G01R31/52
Abstract: A method determines an insulation resistance of the high-voltage network in an electric or hybrid vehicle, in which a controllable continuous voltage source connected to the body and to a single first terminal of a high-voltage battery of the vehicle is provided, a first resistor being connected in series to the source between the single first terminal and the body and a second resistor being connected in series between the first resistor and the source, consecutive voltage setpoint values are applied between the body and the single first terminal, a measurement signal of the voltage at the terminals of the second resistor is acquired for each setpoint value, adaptive filtering of the signal is carried out and an estimate made, in a recursive manner, of a vector of the filter transfer function coefficients, providing an update of the filtering coefficients, the insulation resistance being determined based on the estimate.
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公开(公告)号：US20240103057A1
公开(公告)日：2024-03-28
申请号：US18386611
申请日：2023-11-03
Applicant: Sonjib Banerjee
Inventor： Sonjib Banerjee
CPC classification number: G01R27/18 , G01N27/041 , G01R31/52 , G08B21/182
Abstract: An apparatus (100) to generate an alert based on a health of an earthing system is provided. The apparatus includes a single electrode arrangement comprising a single electrode (102) having one or more sensors (106a-106b) mounted thereon and configured to measure (402) a resistance of an earth pit existing within the earthing system during normal and fault time. The apparatus (100) further includes an electronic module (104) that is communicatively coupled between the one or more sensors (106a-106b) and a communication system (116), and that is configured to communicate (406) the resistance of the earth pit as recorded by the one or more sensors (106a-106b) to the communication system (116); and generate (406) an alert when the resistance of the earth pit exceeds a threshold value. The single electrode (102) is connected via one or more communication means to the electronic module (104).
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公开(公告)号：US11802897B2
公开(公告)日：2023-10-31
申请号：US17675388
申请日：2022-02-18
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Hualei Ju
CPC classification number: G01R27/18 , G01R27/025 , G01R31/52 , G01R31/56 , G01R31/58 , H02S50/10 , H02M7/44
Abstract: An insulation impedance detection method includes: An inverter injects a first common-mode voltage into an alternating current side, where the first common-mode voltage is divided by an alternating current grounding insulation impedance of an alternating current cable and a direct current grounding insulation impedance of a photovoltaic unit. The inverter can obtain an impedance value of the alternating current grounding insulation impedance based on the first common-mode voltage, a voltage divided by the alternating current grounding insulation impedance for the first common-mode voltage (a second common-mode voltage on the alternating current grounding insulation impedance), and an impedance value of the direct current grounding insulation impedance. The alternating current grounding insulation impedance is detected by using a necessary device, namely, the inverter in a photovoltaic power generation system. In this way, an additional detection device is not mounted, which reduces costs and complexity of alternating current grounding insulation impedance detection.
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公开(公告)号：US20190242932A1
公开(公告)日：2019-08-08
申请号：US16262323
申请日：2019-01-30
Applicant: Sendyne Corporation
Inventor： Nicolas Clauvelin , Victor Marten , Ioannis Milios
CPC classification number: G01R27/025 , B60L3/0046 , B60L3/0069 , G01R27/18 , G01R31/007 , G01R31/025
Abstract: Wide deployment of high voltage battery systems in traction, industrial and renewable energy installations is raising the concerns for human safety. Exposure to hazardous high voltages may occur due to deterioration of insulation materials or by accidental events. It is thus important to monitor for such faults and being able to provide timely warnings to affected persons. For this purpose it has become mandatory for electrified passenger vehicles (CFR 571.305) to maintain high isolation values which can be continuously monitored by electrical isolation monitoring devices. The task of monitoring isolation resistance within the electrically noisy car environment is not a trivial task and the solution to this problem has become quickly a field of research and innovation for all affected industries.
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10.发明申请公开(公告)号：US20190212370A1
公开(公告)日：2019-07-11
申请号：US16354806
申请日：2019-03-15
Applicant: TE Connectivity Germany GmbH
Inventor： Stefan Kipp , Gregor Karrasch , Stefan Stross , Stefan Engert
CPC classification number: G01R17/105 , B60L53/18 , B60L53/62 , G01R15/04 , G01R17/10 , G01R17/14 , G01R27/02 , G01R27/16 , G01R27/18 , G01R27/20 , G01R31/04 , G01R31/26 , G01R31/2632 , H02J7/0042 , H02J7/0047 , H02J7/008
Abstract: A monitoring device for monitoring an impedance of a protective conductor. The monitoring device has a first voltage divider for connection to a voltage source including a series connection to a first resistor and a second resistor. The second resistor has a resistance value which corresponds to a threshold value for the impedance of the protective conductor. A second voltage divider includes a series connection to a third resistor and a bridge diode and a connection to the first resistor at a first end of the third resistor and connectable to a second end of the third resistor and to the protective conductor. A measuring device is provided for the detection of a bridge voltage between a first node and a second node if the impedance of the protective conductor is greater than the value of the second resistor.
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