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1.发明公开公开(公告)号：US20230249555A1
公开(公告)日：2023-08-10
申请号：US18097821
申请日：2023-01-17
申请人： Bender GmbH & Co. KG
发明人： Dieter Hackl , Karl Schepp
摘要： Methods and electric circuit arrangements for protecting metallic components in an electrolytic medium from corrosion due to direct-current (DC) stray current (Is) from a power supply system. The DC stray current may be jointly registered as a total sum current across all active conductors together with the protective conductor of the power supply system by a DC total differential-current sensor. Alternatively, a combined DC differential-current sensor is switchable by a switching device, a differential current being registered across all active conductors or the DC stray current being registered as a total differential current across all active conductors and the protective conductor. Alternatively, a differential current may be registered across all active conductors by a DC current sensor at the protective conductor and the DC stray current computed by forming differences of the differential current registered by the differential-current transformer and of the protective conductor registered by the DC current sensor.
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公开(公告)号：US20220357411A1
公开(公告)日：2022-11-10
申请号：US17737195
申请日：2022-05-05
申请人： Bender GmbH & Co. KG
发明人： Julian Reitz , Eckhard Broeckmann , Dieter Hackl , Karl Schepp
摘要： A method and a measuring device for detecting a leakage current in an ungrounded, single-phase alternating-current power supply system. A variable test resistance is switched between one of the outer conductors and ground and starting from a minimally admissible test-resistance value, at least one of three support test-resistance values is determined as support locations. In an equivalent circuit of the modeled alternating-current power supply system, an equations system is set up for describing the dependency of currents and voltages. An extrapolation on the test-resistance value zero leads to a calculated test current which corresponds to the leakage current to be detected. Consequently, a ground fault situation may be simulated without actually causing a dangerous ground fault.
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公开(公告)号：US11175348B2
公开(公告)日：2021-11-16
申请号：US15588860
申请日：2017-05-08
申请人： Bender GmbH & Co. KG
发明人： Eckhard Broeckmann , Dieter Hackl
摘要： The invention relates to a method and a device for identifying arc faults in an ungrounded power supply system. This object is attained by detecting a displacement voltage to ground at an active conductor or at a neutral point of the ungrounded power supply system; by providing a value of an operating frequency occurring in the power supply system; and by analyzing a frequency spectrum of the detected displacement voltage by calculating and assessing Fourier coefficients at the locations of the operating frequency and its harmonics. Due to the broadband detection of the displacement voltage interacting with the “quick” generation of the basic functions by means of a DDS generator, arc faults can be identified reliably in an ungrounded power supply system.
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公开(公告)号：US20210263093A1
公开(公告)日：2021-08-26
申请号：US17183445
申请日：2021-02-24
申请人： BENDER GMBH & CO. KG
发明人： Dieter Hackl
摘要： A monitoring device and a method for monitoring an insulation resistance for an ungrounded electric system includes a liquid cooling operated to ground and having refrigerant flowing in tubes. For this purpose, the measuring signal is supplied in series in the tube system via the refrigerant resistance. The monitoring device is realized having a current measurement or a voltage measurement at the tube sections in order to detect the insulation resistance and can be enhanced for monitoring a shared insulation resistance of several ungrounded electric subsystems fed by a shared transformer.
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公开(公告)号：US10788562B2
公开(公告)日：2020-09-29
申请号：US16566104
申请日：2019-09-10
申请人： Bender GmbH & Co. KG
发明人： Dieter Hackl
摘要： Methods and devices are provided for testing the function of a standard insulation monitoring device, installed in an ungrounded power supply system, during operation. The basic concept of the invention rests upon adding a testing apparatus to the ungrounded power supply system, which is being monitored using an insulation monitoring device according to regulations, between the active conductors of an ungrounded power supply system and ground, said testing apparatus systematically changing an insulation resistance of the ungrounded power supply system and observing the reaction of the insulation monitoring device in a fully automated manner in perpetually repetitive testing cycles. The power supply system is monitored perpetually during its operation. In the method, the current operating state (insulation level, load state) of the power supply system is detected via network parameters, such as insulation resistance and system leakage capacity, and consulted for assessing the functionality of the insulation monitoring device.
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6.发明申请公开(公告)号：US20200303917A1
公开(公告)日：2020-09-24
申请号：US16899249
申请日：2020-06-11
申请人： Bender GmbH & Co. KG
发明人： Dieter Hackl , Oliver Schaefer
摘要： Methods and devices for insulation monitoring of an ungrounded IT power supply system having at least two phase conductors includes determining an insulation resistance separately for each phase conductor using a separate response value. In one embodiment of the invention, relevant current and voltage distributions are calculated. In another embodiment, a change time window is set within which a second response value is activated. In yet another embodiment, an option of shutting down/continuing operation of the IT power supply system is offered.
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公开(公告)号：US10649037B2
公开(公告)日：2020-05-12
申请号：US15941648
申请日：2018-03-30
申请人： Bender GmbH & Co. KG
发明人： Dieter Hackl , Carsten Hartmann
摘要： The invention relates to insulation fault location systems and methods for insulation fault location for an ungrounded DC power supply system, which is redundantly fed from a first direct voltage supply source coupled to diodes and a second direct voltage supply source coupled to diodes and to which a consumer is redundantly coupled. Due to the diode coupling and the asymmetric current splitting of the load current associated therewith, non-compensational partial currents arise in the supply lines in such a power supply system and consequently differential current portions, which can be captured by measuring current transformers and which can interfere with a valid test current during an insulation fault location. In order to eliminate the interfering differential current portions, compensating measures on the primary side are proposed in the measuring current transformers and indirect compensating measures on the secondary side are proposed in an insulation fault location apparatus.
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公开(公告)号：US20200025813A1
公开(公告)日：2020-01-23
申请号：US16511350
申请日：2019-07-15
申请人： BENDER GMBH & CO. KG
发明人： Dieter Hackl , Oliver Schaefer , Pascal Becker , Karl Schepp
摘要： A method and device for determining a division of a total insulation resistance and of a total system leakage capacitance in an ungrounded power supply system. The basic idea is to determine how the total insulation resistance is divided into partial insulation resistances and how the total system leakage capacitance is divided into partial system leakage capacitances between the active conductors of the ungrounded power supply system from displacement voltages measured between each of the active conductors of the ungrounded power supply system based on values determined in advance for the total insulation resistance and for the total system leakage capacitance of the ungrounded power supply system. By evaluating the displacement voltages in terms of their changes in amplitude, their frequency and their phasing, conclusions can be drawn as to the division of the total insulation resistance and of the total system leakage capacitance between the individual active conductors.
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公开(公告)号：US09929558B2
公开(公告)日：2018-03-27
申请号：US14940866
申请日：2015-11-13
申请人： Bender GmbH & Co. KG
发明人： Dieter Hackl
CPC分类号： H02H3/34 , G01R31/086 , H02H1/003 , H02H3/17 , H02H7/28 , Y04S10/522
摘要： An electrical protective device (20) and method are for selective disconnection of a subsystem (6a, 6b) in the event of a second fault in an ungrounded power supply system (2) with a main system (4) and at least one subsystem (6a, 6b), the subsystem (6a, 6b) having a differential current measuring device (12a, 12b) and a switching device (14a, 14b) for separating the subsystem (6a, 6b). The invention is based on generating and applying a measuring signal voltage (Um) between one or more phase(s) of the main system (4) or from a neutral point of the main system (4) against ground (9) using a resonant coupling circuit (22) that has a measuring signal generator (24) and a series resonant circuit (26) connected in series to the measuring signal generator (24), a resonant frequency (f0AK) of the series resonant circuit (26) being set to correspond to the measuring signal frequency.
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10.发明申请公开(公告)号：US20170353155A1
公开(公告)日：2017-12-07
申请号：US15596083
申请日：2017-05-16
申请人： Bender GmbH & Co. KG
发明人： Dieter Hackl , Oliver Schaefer , Manfred Geiss , Karl Schepp
摘要： The invention relates to circuit arrangements for reducing potential-induced degradation in photovoltaic modules of a photovoltaic generator, said circuit arrangements comprising an insulation monitoring device for a temporally continuous insulation monitoring of the photovoltaic generator. Furthermore, the invention relates to a photovoltaic system comprising a circuit arrangement for reducing potential-induced degradation in photovoltaic modules, said photovoltaic system comprising a photovoltaic generator and an insulation monitoring device for a temporally continuous insulation monitoring of the photovoltaic generator. Different solutions are proposed which enable reducing potential-induced degradation while simultaneously continuously monitoring insulations. The circuit arrangements according to the invention rest upon an insulation monitoring device interacting with measures based circuit technology for influencing potentials in a photovoltaic module.
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