78 results about "Capacitive voltage divider" patented technology

The invention provides an electric energy quality on-line monitoring device and a cloud platform cooperation system, and relates to the technical field of electric energy quality management, and the device comprises a signal collection unit which obtains three-phase voltage and current signals in parallel through a Rogowski coil and a capacitive voltage divider; the event detection unit is used for synchronously executing harmonic spectrum analysis and transient event capture by adopting a parallel processing architecture realized by an FPGA (Field Programmable Gate Array); the edge processing unit is connected with the event detection unit, and is configured to encode the transient event features into a Gramer angle field image and compress steady state data into feature vectors; the multimode communication unit comprises a 4G / 5G wireless module and an optical fiber Ethernet interface; and the strategy execution interface outputs a treatment instruction to the compensation device through the D / A converter and the current loop. Through collaborative innovation of the device and the cloud platform, the power quality monitoring and treatment efficiency is remarkably improved.

The invention provides a high-voltage test method and device for electrical equipment, electronic equipment and a storage medium, the method is applied to a high-voltage test device, and the high-voltage test device comprises a bearing platform, a frequency modulation and voltage regulation power supply arranged on the bearing platform, an excitation transformer, an adjustable reactor and a capacitive voltage divider. Comprising the following steps: controlling an adjustable reactor and a capacitive voltage divider to be converted from a storage state to a working state on a bearing platform; target electrical equipment is connected to the output end of the adjustable reactor to form a series resonance circuit; a target test item is determined, and the voltage output frequency and the inductance value of the adjustable reactor are adjusted according to preset target test parameters of the target test item, so that the series resonance circuit reaches a resonance state; and outputting a voltage according to the target test parameter, obtaining a test operation parameter of the target electrical equipment, and generating a target test result according to the test operation parameter. According to the invention, the testing efficiency of high-voltage testing of the ultrahigh-voltage electrical equipment can be improved.

A control device (100) for controlling at least one actuator (200) for actuating an optical element (310) of an optical system (300), comprising an amplifier (110) which is configured to receive a provided supply voltage (V1) at an input node (K1) and to provide a control voltage (V2) for the actuator (200) at an output node (K2), wherein the amplifier (110) has a resistive voltage divider (R1, R2) for adjusting the gain of the amplifier (110) with a first resistor (R1) and a second resistor (R2) and a capacitive voltage divider (C1, C2) with a first capacitor (C1) and a second capacitor (C2), wherein the capacitive voltage divider (C1, C2) is connected in parallel to the resistive voltage divider (R1, R2).

The invention discloses a transformer neutral point protection device based on a built-in capacitive voltage divider, which comprises a maintenance switch, a lightning arrester, a discharge unit, a signal processing module and a gap overcurrent protection current transformer, and is characterized in that the discharge unit comprises a sleeve, a connecting conductor, a contact seat, the built-in capacitive voltage divider, a first cylinder, a second cylinder, a discharge gap and a basin-type insulator; the top of the sleeve is connected with a transformer neutral point, the bottom is connected with the first cylinder, and the basin-type insulator is connected between the first cylinder and the second cylinder; the built-in capacitive voltage divider is arranged on the inner wall of the first cylinder body, the discharge gap is arranged in the second cylinder body, the built-in capacitive voltage divider and the discharge gap are both connected with the signal processing module, and the discharge gap is connected with the gap overcurrent protection current transformer; the top end of the connecting conductor is fixedly connected with the inner top of the sleeve, and the bottom end is inserted into a contact seat in the first cylinder. The contact seat is fixedly connected with the basin-type insulator. Discharge gap misoperation caused by external factors can be effectively avoided, and the reliability of the protection device is improved.

The application discloses a kind of transformer intelligent enclosed neutral point protection devices, including maintenance switch, lightning arrester, capacitive voltage divider, filter module, isolation transformer, charge-discharge module, voltage detection module, gap discharge unit, digital control unit;Filter module is used to filter the voltage signal of capacitive voltage divider after voltage division flows into isolation transformer, removes high-frequency signal, retains power frequency or its multiple frequency signal, realizes the distinction of transient overvoltage signal and steady overvoltage signal;Voltage detection module is used to detect the voltage amplitude of four capacitors in charge-discharge module, duration, and real-time transmission detection data to digital control unit, and digital control unit real-time uploads detection data to main control background, control pulse trigger controllable switch opens or closes, control discharge of enclosed discharge gap.The application realizes the accurate identification of transformer neutral point overvoltage type, solves the problem of high misoperation rate of existing device, damage transformer.

The application discloses a standard capacitance voltage divider for measuring wide-range voltage and a measuring method. The standard capacitance voltage divider for measuring wide-range voltage comprises an insulating outer cylinder, an electrode module arranged at the upper end inside the insulating outer cylinder and a low-voltage arm module arranged at the bottom outside of the insulating outer cylinder. The electrode module comprises a high-voltage electrode, a low-voltage electrode and a shielding electrode. The high-voltage electrode, the low-voltage electrode and the shielding electrode are coaxially combined. The lower end of the shielding electrode is connected with a lower flange arranged at the bottom of the insulating outer cylinder through a supporting rod. The low-voltage arm module comprises a low-voltage arm external box and a low-voltage arm. The low-voltage arm external box is fixed at the lower end of the lower flange. The low-voltage arm is arranged in the low-voltage arm external box. The wide dynamic voltage can be reliably and accurately measured.

A transistor device includes: a substrate; an epitaxial layer stack formed on the substrate, the epitaxial layer stack including a heterojunction between two epitaxial layers having different band gaps, the heterojunction defining a channel region of the transistor device; a source terminal electrically connected to a source region of the epitaxial layer stack; a drain terminal electrically connected to a drain region of the epitaxial layer stack; a gate terminal electrically connected to a gate structure laterally between the source region and the drain region; a substrate terminal electrically connected to the substrate; and a capacitive voltage divider circuit electrically connected between the source region and the substrate. In a blocking state of the transistor device, the capacitive voltage divider circuit is configured to clamp the electric potential of the substrate to a positive value. Additional transistor device embodiments are described.

The invention relates to a broadband low-inductance ohmic-capacitive voltage divider (1) for a partial discharge measurement, having at least one first part (T1) and at least one second part (T2), wherein the first part (T1) and the second part (T2) are connected in series in order to serve as a voltage divider (1), an inductively based partial discharge measuring device (TEL) i. is integrated into the first part (T1) or the second part (T2) or ii. is provided between the first part (T1) and the second part (T2), and the ohmic elements as well as the capacitive elements of the first part (T1) and of the second part (T2) are adapted to one another such that a low-impedance current flow through the partial discharge measuring device at a frequency which differs from the grid frequency and which is higher than 150 KHz is made possible.

A capacitive level sensor (10) for measuring the level (H1, H2; H1', ​​H2') of a medium (16) in a container (14), comprising an electrode unit (12) comprising a strip-shaped measuring electrode (22), a strip-shaped counter electrode (24), and a strip-shaped shielding electrode (26, 28, 40), wherein the shielding electrode (26, 28, 40) at least partially surrounds the measuring electrode (22), and a signal processing arrangement (46), characterized in that a first AC voltage source (60) with a predetermined frequency and amplitude is provided, to which the shielding electrode (26, 28, 40) is connected, such that a shielding capacitor (54, 56) formed between the shielding electrode (26, 28, 40) and the measuring electrode (22) 58) has a shielding capacitance that is proportional to the length of the shielding electrode (26, 28, 40), that a second AC voltage source (66) of the same frequency and with a predetermined second amplitude is present,wherein the second amplitude is out of phase with the first amplitude to which the counter-electrode (24) is connected, such that a measuring capacitor (52) formed between the counter-electrode (24) and the measuring electrode (22) has a measuring capacitance that is proportional to the fill level (H1, H2; H1', ​​H2'), that the measuring capacitor (52) and the shielding capacitor (54, 56, 58) are connected to form a capacitive voltage divider, and that the divided measuring electrode voltage (72) applied to the measuring electrode (22) is used to determine the fill level (H1, H2; H1', ​​H2') in the signal processing arrangement (46).

A circuit is described that includes a resistor and a diode configured to receive a diode current such that a forward voltage appears across the diode. The circuit further includes a switched capacitor voltage divider and a voltage-to-current converter. The switched capacitor voltage divider is connected to the diode and configured to receive the forward voltage and output a scaled voltage that is a fraction of the forward voltage. The voltage-to-current converter is coupled between the switched capacitor voltage divider and the resistor and is configured to provide a resistor current that is proportional to the scaled voltage and inversely proportional to a resistance of the resistor. The circuit also includes a current source configured to provide the diode current as a function of the resistor current.

An amplifier circuit that includes a capacitor voltage divider that is selectively enabled with a switch. The circuit includes two capacitor banks where the banks are electrically coupled to opposing side terminals of the switch. When the capacitor voltage divider is not enabled, one bank is adjusted to control the gain of the amplifier. When the capacitor voltage divider is enabled, both banks are used to control the gain of the amplifier.

The invention discloses a 10kV pole-mounted switch primary and secondary fusion voltage and current integrated sensor, and belongs to the technical field of power system sensing. The sensor adopts a conformal implantable design, an electric field coupling capacitance voltage division type voltage sensing unit and a single-turn through type LPCT are integrated at a pole-mounted switch wire inlet end, and non-contact measurement of voltage and current is realized. The voltage sensing unit optimizes a low-voltage arm circuit through a secondary active capacitive voltage divider, the current sensing unit adopts a single-turn through type LPCT to realize high-precision current acquisition, and the whole body is encapsulated by solid epoxy resin to form a totally-enclosed insulation structure. The problems that a traditional mutual inductor is large in size, low in integration level, complex in insulation and difficult to achieve distributed installation are solved, and the transformer has the advantages of being small in size, integrated, high in insulation and high in reliability. And the requirements of primary and secondary fusion of the 10kV pole-mounted switch and intelligent development of power distribution network equipment on harmonic wave capture, distributed installation and wide-area deployment can be met.

The disclosure relates to a capacitive voltage sensor arrangement for an electrical energy distribution network. The capacitive voltage sensor arrangement includes a first input terminal, a second input terminal, a first sensor output terminal, and a second sensor output terminal. Further, the capacitive voltage sensor arrangement comprises a capacitive voltage divider comprising a primary capacitor arranged between the first input terminal and the first node and a secondary capacitor arranged between the first node and the second input terminal and electrically connected in series to the primary capacitor. The voltage sensor arrangement further includes a tuning circuit arranged between the first node, the second node, the third node, and the fourth node. The second node is connected to the first sensor output terminal, the third node is connected to the second input terminal, and the fourth node is connected to the second sensor output terminal. In addition, the tuning circuit includes only one or more passive components.

The application relates to a dielectric loss measurement error correction method and device for a capacitive voltage transformer. The method comprises the following steps: constructing a dielectric loss measurement equivalent analysis circuit based on a dielectric loss equivalent circuit as a target circuit model; the target circuit model is used for quantitatively calculating dielectric loss test data of the capacitive voltage transformer under the influence of an interference branch; obtaining a target expression set corresponding to the target circuit model, and obtaining a first dielectric loss value and a first capacitance parameter corresponding to an electromagnetic unit in the capacitive voltage transformer according to the target expression set; determining a dielectric loss measurement correction result as corrected dielectric loss data corresponding to a capacitance divider in the capacitive voltage transformer according to test current parameter information measured under preset test conditions, the first dielectric loss value and the first capacitance parameter. The method can correct the dielectric loss measurement error of the capacitive voltage transformer, and improves the dielectric loss measurement accuracy of the capacitive voltage transformer.

A schematic diagram of a wideband measurement system for mixed-connected CVT based on an optical voltage sensor is provided. The wideband measurement system comprises a CVT power frequency measurement section and an optical wideband measurement section. In the optical wideband measurement section, a low-voltage capacitor is connected in series between the low-voltage terminal and the ground terminal of the medium-voltage capacitor in the capacitor voltage divider. An optical voltage sensor is connected in parallel across the terminals of the low-voltage capacitor to measure the wideband voltage signal under test. The wideband measurement system for mixed-connected CVT described in the invention enables the CVT to have wideband measurement capabilities while ensuring the accuracy of conventional CVT power frequency measurements.

The utility model discloses a measuring circuit for a partial discharge test of high-voltage electrical equipment. Comprising a voltage regulator, a transformer, a partial discharge value measuring unit, a high-precision capacitive voltage divider, a test object and a current-limiting resistor, the input end of the transformer is connected with the output end of the voltage regulator, the output end of the transformer is connected with the input end of the current-limiting resistor, and the output end of the current-limiting resistor is connected with the partial discharge value measuring unit. One end of the high-precision capacitive voltage divider and one end of the test object are connected with the partial discharge numerical value measuring unit, the other end of the high-precision capacitive voltage divider and the other end of the test object are connected with the output end of the transformer and are grounded, one end of the low-voltage electricity meter is connected with the high-precision capacitive voltage divider, and the other end of the low-voltage electricity meter is grounded. Therefore, the high-voltage condition of the partial discharge experiment is more accurate, the problem of inaccurate high-voltage measurement value in the prior art is solved, and the measurement value of the partial discharge tester can objectively evaluate the internal defect of a test object.

1. A memory device for storing data, comprising: a voltage divider circuit comprising at least one memory element, the at least one memory element operable or selected to be in a resistance and / or impedance state representative of at least a portion of the data, the voltage divider circuit configured to divide a voltage in response to the resistance and / or impedance state of the at least one memory element as part of a data read and / or data write operation, the at least one memory element being capacitive and connected to one or more further capacitive elements such that the voltage divider circuit comprises a capacitor divider configuration.

The present application discloses a device for high and low voltage management, which relates to the technical field of voltage transformers, including a base, an outlet box and a capacitor voltage divider, the capacitor voltage divider including a ceramic sleeve, a sealing plate fixed on the top of the capacitor voltage divider, and a cap fixed on the top of the sealing plate; a bottom ring and a lifting ring are provided between the sealing plate and the cap, and an expansion joint is fixed between the bottom ring and the lifting ring; a driving tube and a transfer tube are fixed to the lower end face of the lifting ring, a first piston is slidably connected inside the driving tube, a lifting rod is fixedly connected to the bottom of the first piston, and the bottom end of the lifting rod is fixedly connected to the upper end face of the sealing plate; the transfer tube is divided into an upper branch tube, a lower branch tube and an elastic tube; one side of the top end of the driving tube is fixedly connected to one side of the top end of the transfer tube by a connecting tube; a temperature sensing component is fixed to the bottom of the lower branch tube; the technical effect of reducing the influence of the device's own volume on the oil pressure when the device balances the oil pressure during temperature changes, thereby improving the pressure compensation accuracy, is achieved.

The invention discloses a method and system for reducing dielectric loss of a capacitive voltage divider, and belongs to the technical field of alternating voltage testing. The method comprises the following steps: determining measurement requirements and environment requirements of broadband measurement and high-precision measurement; adjusting component parameters of an RC network in the capacitive voltage divider based on the measurement requirement and the environment requirement; enabling the component parameters to meet a preset constraint condition so as to reduce the dielectric loss of the capacitive voltage divider; and the RC network is connected in parallel with two ends of a low-voltage capacitor CL in the capacitive voltage divider. The device can be flexibly adjusted according to actual application requirements, and is suitable for different types of capacitive voltage dividers and measurement environments. The implementation mode is simple and the cost is low. The method can be realized by adopting conventional resistor-capacitor elements without special devices, and is convenient for engineering popularization and batch production.

The invention provides a winding method of a CVT capacitive voltage divider and a winding system based on the CVT capacitive voltage divider, and the method comprises the steps: S10, obtaining a first aluminum foil and a second aluminum foil, and carrying out the double-side edge folding processing of the first aluminum foil and the second aluminum foil; s20, laminating the first aluminum foil subjected to edge folding treatment, first capacitor paper and a first lower isolating membrane to form a first aluminum foil membrane group; s30, laminating the second aluminum foil subjected to edge folding treatment with a first upper isolating membrane, second capacitor paper and a second lower isolating membrane to form a second aluminum foil membrane group; and S40, after the second upper isolation film is clamped by the opposite compression roller, the second aluminum foil film group and the first aluminum foil film group are stacked and wound on the capacitor winding shaft. According to the winding method of the CVT capacitive voltage divider provided by the invention, the capacitor roll can obtain better tightening force in a mode of laminating the two aluminum foil film groups through the second upper isolating film, and the two aluminum foil film groups do not need to bear excessive tension, so that the wound capacitive voltage divider is shaped and is not easy to deform.

The present invention relates to a human body dynamic potential tester based on a capacitive voltage divider, comprising: a potential sensor using a coaxial capacitive voltage divider for detecting a potential signal; a signal processing system disposed within the potential sensor for amplifying and filtering the potential signal to obtain a measured value; a data visualization module for visualizing the measured value; a main control module for compensating the measured value and controlling the human body dynamic potential tester as a whole; a power supply module for supplying power to the human body dynamic potential tester; and a housing enclosing the power supply device of the human body dynamic potential tester, the housing being grounded. The present invention is advantageous in eliminating system measurement errors caused by test distance, integrating a signal sampling module within a coaxial high-voltage voltage divider, and thereby reducing environmental noise introduced by signal lines. It is capable of accurately measuring electrostatic dynamic potential and monitoring human body potential in anti-static work areas such as electronic product and pyrotechnic production workshops.

The invention discloses a full-band sensor and a full-band detection device.The full-band sensor comprises an HFCT layer set, an antenna layer set and a shielding layer set, the HFCT layer set comprises sensing units and a base body, a plurality of grooves are formed in the base body, the sensing units are installed in the corresponding grooves, and the multiple sensing units are sequentially connected in series to form a winding; the antenna layer group comprises a first insulating layer and a first conductor layer, the first insulating layer and the first conductor layer are stacked, and a first conductive pattern is arranged on the first conductor layer; the shielding layer group comprises a second insulating layer, a third insulating layer and a second conductor layer, the base body, the second insulating layer, the second conductor layer, the third insulating layer and the first conductor layer are sequentially stacked, the second conductor layer is provided with a copper layer, and the capacitive voltage divider is formed among the second conductor layer, the third insulating layer, the first conductor layer, the first insulating layer and the iron core. According to the invention, synchronous acquisition of high-frequency partial discharge, ultrahigh frequency, overvoltage, common frequency and harmonic signals thereof is realized.

The utility model provides a kind of 3VA ultra-low power consumption's primary and secondary depth fusion device, including primary switch and FTU controller, primary switch is built-in for the pole of capacitor power taking, and its power side and load side are connected with the output end of a pole respectively;Capacitor power taking module is arranged in pole, and capacitor power taking module includes capacitor voltage divider and electromagnetic unit, one end of the high voltage capacitor of capacitor voltage divider is connected with the high voltage terminal of primary switch, and the other end is connected with the low voltage terminal of primary switch by low voltage capacitor, and the medium voltage capacitor tap of high voltage capacitor and low voltage capacitor is connected with the input end of electromagnetic unit, and electromagnetic unit provides matching inductive compensation output standard 24V low-voltage alternating current.The utility model reaches the effect of easy installation and maintenance, efficient electric energy conversion, low-power operation and self-adapting power management by setting the pole of built-in capacitor power taking in primary side and the power management module of FTU controller.

A device for protecting, controlling and monitoring an electrical medium range switching device, the device comprising the use of a Rogowski coil embedded within a bottle of the switching device, and the bottle surrounding the flow of voltage and current of a main power source, a capacitive or similar voltage divider also surrounding the main power source and extending around the bottle, an analog signal is provided from these devices to an integrated circuit for conversion into a digital signal, and then the digital signal is passed as an output to a digital collector in which the digital signal is optionally time-stamped and compared to other signals, standard values or own signals at different times.

The invention relates to an electrical quantity processing device and method and a relay protection system based on an active electronic transformer, and the electrical quantity processing device comprises a current processing unit and a voltage processing unit. The current processing unit and the voltage processing unit are respectively used for inputting a current digital signal and a voltage digital signal which are output after data synchronization of the Rogowski coil and the capacitive voltage divider, the current processing unit comprises a virtual capacitive voltage divider, and the voltage processing unit comprises a virtual Rogowski coil. The virtual capacitive voltage divider and the virtual Rogowski coil are used for eliminating transmission difference of the current digital signal and the voltage digital signal caused by different transmission of the Rogowski coil and the capacitive voltage divider. According to the electrical quantity processing device, through the virtual capacitive voltage divider and the virtual Rogowski coil, the problem of transmission difference between a voltage signal and a current signal is solved, more accurate electrical quantity data can be provided, and the accuracy of relay protection calculation is improved.

In an embodiment a light emitting device includes a light source, a switching element having an input capacitance associated therewith, the switching element being configured to control a current flow to the light source in accordance with a charging of the input capacitance, a voltage control element coupled with the switching element and having a voltage supply node, the voltage control element having a second capacitance associated therewith, wherein the voltage control element and an input of the switching element are coupled to one another such that the voltage control element and the input of the switching element form a capacitive voltage divider and a driving element configured to provide a driving voltage at the voltage supply node, the driving voltage being greater than a maximum allowable input voltage of the switching element, wherein a relationship between the input capacitance and the second capacitance is in accordance with a relationship between the driving voltage and the maximum allowable input voltage.

This application relates to the field of power equipment condition monitoring technology, specifically to a distributed voltage sensing probe, system, and method for dry-type air-core reactors. The probe includes: an annular insulating shell adapted to surround the reactor coil; an induction plate disposed inside the annular insulating shell for coupling with the electric field on the surface of the coil to form a coupling capacitor; and a signal processing module disposed inside the annular insulating shell, which includes a precision voltage-dividing capacitor forming a capacitive voltage divider circuit with the coupling capacitor. The probe, through the capacitive voltage divider circuit, proportionally converts the high voltage of the coil into a low-voltage signal characterizing the voltage of the coil relative to ground or between coils. This ability to proportionally convert the high voltage of the coil into a low-voltage signal characterizing its voltage relative to ground or between coils provides a direct voltage monitoring means for early fault detection inside the reactor, and the probe's adaptability design conforms to the shape of the coil, ensuring the stability of the voltage sensing.

The present invention discloses a method for testing the ratio error of a capacitive voltage transformer using an equivalent method, belonging to the field of transformer measurement technology. Based on the Thevenin law, the CVT electromagnetic circuit is equivalent to a pure circuit, and the CVT ratio K is obtained to be equal to the product of the capacitive voltage divider CVD ratio K1 and the equivalent intermediate voltage transformer IVT ratio K2. The ratio error r% is approximately equal to the sum of r1% and r2%, simplifying the testing process. High-precision standard equipment and the differential measurement method are used to improve test accuracy. This method is applicable to CVTs with voltage levels of 110kV and above and is not restricted by environmental, spatial, and other factors.

The invention relates to a method for determining a state of a capacitive voltage transformer (50) comprising a capacitive voltage divider with a first capacitor (C1) and a second capacitor (C2) on its primary side. The first capacitor (C1) has a high voltage connection (HV) for connecting to a high voltage (60) and the second capacitor (C2) has a ground connection (NHF). A first resonance frequency (ω e ) is determined by a plurality of first short circuit impedance measurements at different frequencies on the secondary side of the capacitive voltage transformer (50) with the high voltage connection (HV) grounded (70). A second resonance frequency (ω2) is determined by a plurality of second short circuit impedance measurements at different frequencies on the secondary side of the capacitive voltage transformer (50) with the high voltage connection (HV) open. A capacitance ratio (K e ) of the capacitive voltage divider (50) is determined based on the first resonance frequency (ω C ) and the second resonance frequency (ω2).

The invention provides a multi-channel reconfigurable capacitance-to-digital converter for a wearable sensing system, and belongs to the technical field of capacitance-to-digital converters. The output end of a capacitive voltage divider network is in signal connection with the input end of an on-chip or off-chip offset capacitance calibration circuit, and the output end of the off-chip offset capacitance calibration circuit is in signal connection with the input end of an on-chip differential logic successive approximation register type analog-to-digital converter circuit; the output end of the on-chip differential logic successive approximation register type analog-to-digital converter circuit is in signal connection with the input end of the digital signal processing circuit; according to the invention, sub-muW wearable sensing application and a capacitive sensor array supporting wearable medical application can be realized; a high-power-consumption operational transimpedance amplifier is eliminated, and the capacitance detection precision is improved through a capacitance calibration technology; specific channel information among 10 available channels can be distinguished, and the digital output of the CDC can be accessed through an SPI.