108 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 relates to the technical field of harmonic transformer metering, in particular to a broadband standard voltage transformer for harmonic transformer error measurement, which comprises a capacitive voltage divider body, a frequency detection unit, a measurement control unit, a compensation unit, a shielding shell and insulating oil, the capacitive voltage divider body, the frequency detection unit, the measurement control unit and the compensation unit are arranged in a shielding shell, and transformer oil is further arranged in the shell. And the influence of impedance change under different frequencies, self capacitance drift under different temperature and humidity and stray capacitance under different voltages on the body capacitance is compensated, so that a wide-frequency-domain high-precision standard device is constructed, and the broadband error verification of the power voltage transformer is realized.

The invention discloses a harmonic and super-harmonic measuring system and measuring method based on the CVT capacitive current principle, and belongs to the technical field of harmonic and super-harmonic measurement. According to the method, capacitive current analog signals on a voltage dividing capacitor C1 and a voltage dividing capacitor C2 are collected, the capacitive current analog signals are transmitted to a harmonic and super-harmonic measuring device, and the harmonic and super-harmonic measuring device measures the harmonic and super-harmonic. And the harmonic and super-harmonic measuring device is used for restoring a primary side total voltage waveform based on the capacitance current analog signal, the equivalent capacitance of the voltage dividing capacitor C1 and the equivalent capacitance of the voltage dividing capacitor C2. Influences of internal inductance and capacitance equivalent resistance of the capacitive voltage divider are considered, a primary side voltage reduction formula of the capacitive current method is corrected, and the corrected capacitive current method is suitable for ultra-harmonic measurement.

The invention relates to a high-voltage alternating-current withstand voltage test device and method for high-voltage equipment adopting a capacitive voltage divider, and relates to the related field of withstand voltage test, the device comprises a test box and a partition plate fixed in the test box, the partition plate is provided with a test board, the device further comprises test equipment, the test equipment is fixed in the test box, and the test board is connected with the test box. Test wires electrically connected with the test equipment are fixed to the two sides of the test equipment correspondingly, communication assemblies connected with the test wires are installed at the ends, away from the test equipment, of the test wires correspondingly, two bearing pieces are fixed to the test table, and bearing rollers used for bearing test pieces are rotationally installed on the two bearing pieces; the partition plate is provided with a butt joint assembly used for driving the communicating piece to move relatively, the contact pieces make contact with pins of the test piece after the butt joint piece moves to the tail end of the stroke, and a circuit is connected through the communicating assembly when the two contact pieces and the bearing box move to the tail end of the stroke. The connection work can avoid the generation of electric arc when the electric power is cut off through the arc extinction piece, so as to avoid the problem that the test time is prolonged due to the electric arc.

The invention relates to a steering wheel arrangement 1 for a vehicle comprising a steering wheel device 2, wherein: the steering wheel device 2 has a steering wheel skeleton 3, a first conductive layer 6 and a second conductive layer 8; an inter-layer capacitor C_Layer_12 is formed between the first conductive layer 6 and the second conductive layer 8; a skeleton capacitor C_Skeleton is formed between the second conductive layer 8 and the steering wheel skeleton 3; the steering wheel skeleton 3 can be and / or is coupled to an earth M of the vehicle via a skeleton connection 13; the inter-layer capacitor C_Layer_12 and the skeleton capacitor C_Skeleton form a capacitive voltage divider for a voltage present at the first conductive layer 6; and a partial voltage can be sensed at the second conductive layer 8. The steering wheel arrangement also comprises an evaluation device 16, wherein the evaluation device 16 is designed to detect the partial voltage at the second conductive layer 8 and, on the basis of the detected partial voltage, assess the skeleton connection 13 to be OK, or not OK.

The invention discloses a high-voltage capacitance electricity taking device, and relates to the field of electric energy storage, the high-voltage capacitance electricity taking device comprises an electricity taking device shell, an electromagnetic unit and a flowing part, an insulating sleeve is arranged on the electricity taking device shell, a capacitance voltage divider is arranged in the insulating sleeve, a spiral cavity is formed in the electricity taking device shell, and a power source is arranged in the spiral cavity. A first flowing opening and a second flowing opening are formed in the inner side wall of the electricity taking device shell, and the spiral cavity communicates with the electricity taking device shell through the first flowing opening and the second flowing opening. When a high-voltage power transmission circuit is switched on and the environment temperature and humidity are relatively high, the flowing part works to enable the locally overheated insulating oil of the electromagnetic unit to circularly flow, and the wind wheel on the connecting shaft rotates to form airflow to perform air-cooling heat dissipation on the expanded heat dissipation fins, so that the insulating oil entering the heat dissipation fins is cooled, and the heat dissipation efficiency is improved. The temperature of the insulating oil is further reduced, and the situation that the insulating oil is decomposed to generate a large amount of gas to damage the shell of the power taking device under the action of long-time high temperature and high electric field intensity is avoided.

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 utility model provides an end-to-end operation impact test device for a high-voltage resistor. The end-to-end operation impact test device is mainly used for solving the technical problem that an existing impact voltage generator cannot carry out an end-to-end operation impact test on the high-voltage resistor. The circuit comprises a wave tail resistor, a main capacitor, a wave head resistor, a wave head capacitor, a capacitive voltage divider and a wave modulation inductor. Wherein the two ends of the capacitive voltage divider serve as measuring ends, are connected with the high-voltage resistor in parallel and are used for applying rapidly changing high-voltage impact to the two ends of the high-voltage resistor. By adjusting the inductance value, the test device can output a standard waveform meeting the requirement, so that the inter-end operation impact test of the high-voltage resistor with the resistance value is completed.

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 utility model provides a fixed protection device for a wire and cable high-voltage test, which belongs to the field of wire and cable tests, and comprises a base, a plurality of placing grooves are formed in the base, a generator, an exciting transformer, a reactor and a capacitive voltage divider are respectively mounted in the placing grooves, a support frame is fixedly connected to the upper end face of the base, and the upper end face of the support frame is fixedly connected with a power supply. A mounting groove is formed in the supporting frame, a variable-frequency power source is mounted in the mounting groove, and a winding assembly is mounted on the base. And a fixing assembly. According to the utility model, the reactor and the capacitive voltage divider can be sleeved through the fixing ring, so that the reactor and the capacitive voltage divider are prevented from toppling due to external force, the stability of the device is improved, accidents during high-voltage test are avoided, the safety of the test process is improved, an overlong connecting wire can be wound on the winding roller, and the service life of the device is prolonged. Tediousness when a user installs and disassembles the device due to intertwining of the connecting lines is avoided, and safety accidents can be reduced.

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).

The invention relates to a measuring device (400) for an optical system (300), comprising: an input node (K1) for receiving a voltage (V2) dropped in the optical system (300); a capacitive voltage divider (410) connectable to the input node (K1) and comprising a series circuit consisting of at least two capacitors (C1, C2) comprising a measurement capacitor (C2) wherein the capacitive voltage divider (410) is designed to provide a measurement voltage (V3) dropped at the measurement capacitor (C2), the measured voltage is lower than the voltage (V2) received at the input node (K1) and is proportional to the voltage (V2) received at the input node (K1); and a controllable first switch (S1) coupled between the input node (K1) and the capacitive voltage divider (410) and designed to connect the capacitive voltage divider (410) to the input node (K1) based on a control signal (SE1).

The invention discloses a device for measuring a converter transformer valve side AC voltage, and the device comprises a main body unit which is composed of a resistance-capacitance voltage divider and is used for carrying out the voltage division of an AC-DC superposed voltage; and the secondary voltage dividing unit is connected in parallel with a capacitive voltage divider on an output terminal of the resistance-capacitance voltage divider and is used for isolating direct current voltage from the direct current component output by the main body unit. The problem of converter transformer valve side AC voltage measurement is solved.

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.

A device for protecting, controlling, and monitoring insulated conductors comprising use of a Rogowski coil surrounding the conductor and a capacitive or similar voltage-like divider, also surrounding the conductor and connected thereto and to ground, and providing analog signals from those devices to an integrated circuit for conversion by look up tables on the integrated circuit to digital signals and then transmitting as output the digital signals to a data collector and memory device where the same are optionally time stamped and compared to one another, to a standard or to themselves at a different time for providing a mechanical, electrical or electronic signal.