Electric reactor potential distribution measuring device and method

Abstract

The invention discloses an electric reactor potential distribution measuring device and a corresponding use method of the electric reactor potential distribution measuring device, and the electric reactor potential distribution measuring device is based on an H-bridge type bipolar power amplifier structure, adopts a high-voltage MOSFET and a high-speed isolation driving circuit, and supports a + / -150V output voltage range and a 150V / mu s slew rate. The requirements of output amplitude, bandwidth and stability are considered; by optimizing feedback control and power supply filtering design, high-fidelity amplification output of typical transient waveforms such as standard lightning shock waves and operating overvoltage waves is realized, and excitation requirements of high-frequency transient tests such as electric reactors and transformer windings are met; and meanwhile, a test platform with a structure reconfigurable characteristic is constructed, and mechanical interface designs such as a quick-assembly buckle are adopted, so that quick assembly, disassembly and replacement of various typical reactor winding structures are supported, and the practicability and the efficiency of the test bed are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coil device test, in particular to an electric reactor potential distribution measuring device and method. BACKGROUND

[0002] Extra-high voltage shunt reactor is a key equipment in the extra-high voltage alternating current transmission system, which is widely used in transmission lines, substations and power plants, mainly for reactive power compensation and voltage and current regulation. The equipment is easily affected by lightning overvoltage, operating overvoltage and GIS caused fast transient overvoltage impact during operation, forming a complex voltage distribution, which produces transient stress concentration on the winding insulation system, and induces partial discharge or even insulation breakdown. In recent years, the overvoltage waveform spectrum invading the system in the actual working condition is complex and the wave front is steep, which is quite different from the 1.2 / 50 μs lightning impulse wave or 250 / 2500 μs operating wave used in the existing standard test. The traditional insulation test method cannot fully reflect the actual situation.

[0003] Laboratory often uses scaled model combined with artificial excitation signal to study the impact response. The typical method is to use a signal generator to synthesize a standard or non-standard impulse wave, which is boosted by a power amplifier and then applied to the model winding. The oscilloscope and probe are used to measure the winding tap potential response. Due to the bandwidth-gain product limitation, the maximum peak-to-peak output of the existing power amplifier is about 140Vpp under the premise of meeting the frequency requirement. After the signal is transmitted to the winding, it is difficult to obtain clear measurement signal directly in the winding due to the low signal amplitude, which cannot truly reflect the actual overvoltage propagation characteristics.

[0004] In addition, existing researches focus on the potential sampling at the winding tap position, and there is no comprehensive measurement system for the distribution voltage of key positions such as creepage, turn-to-turn insulation and disk-to-disk insulation, which leads to limitations in verifying the transient electromagnetic process of fine winding structure with experimental results. Although the wave process simulation calculation is increasingly refined at this stage, it lacks systematic experimental data support, making it difficult to fully verify its effectiveness and limiting its guiding effect on insulation design parameters. SUMMARY

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides an electric reactor potential distribution measuring device, which can combine a high-voltage bipolar power excitation module, a reconfigurable modular test platform and a multi-channel synchronous acquisition link, effectively solving the problems of insufficient excitation capacity, poor structure adaptability and low response authenticity of key measurement points of existing systems, and improving the excitation capacity and the authenticity of transient potential response, realizing rapid replacement and combination of winding structure, and improving the test efficiency and structure adaptability.

[0006] The present application also provides a method corresponding to the electric reactor potential distribution measuring device.

[0007] The reactor potential distribution measuring device according to the first aspect of the embodiment of the present application, characterized in that comprising:

[0008] The high-voltage bipolar power amplification module, the modular winding test platform and the multi-point synchronous acquisition system, wherein:

[0009] The high-voltage bipolar power amplification module is used for injecting a high-voltage transient excitation signal into the measured winding;

[0010] The modular winding test platform is used for carrying the measured winding which can be disassembled and replaced;

[0011] The multi-point synchronous acquisition system is used for synchronously measuring the potential response signals of each measuring point of the measured winding.

[0012] The reactor potential distribution measuring device according to the embodiment of the present application has at least the following beneficial effects:

[0013] (1) The excitation ability is improved, and the authenticity of the transient potential response is enhanced

[0014] The H-bridge full-bridge topology power amplification module is adopted in the present application, the output capacity can reach ±150V (300Vpp), the pressure swing rate is more than 150V / μs, the high-voltage waveform can be stably output under the steep transient excitation such as lightning impulse, and the problems of low output amplitude and front edge distortion of the traditional linear power amplifier limited by the voltage resistance and thermal design are effectively overcome. The turn-to-turn and pie-to-pie voltage response test results are highly consistent with the simulation trend, and the authenticity and engineering representativeness of the potential distribution measurement are significantly improved.

[0015] (2) The winding structure is quickly replaced and combined, and the test efficiency and structural adaptability are improved

[0016] The system introduces a detachable upper yoke structure and a multi-style winding clamp installation mechanism, supports the quick switching of various typical winding structures such as continuous type and entangled type, and can flexibly construct combined forms such as series and capacitive coupling, without the need to repeatedly wind the prototype, greatly improving the experimental efficiency and prototype reuse rate, and being suitable for systematic structural comparison research and multi-round engineering verification.

[0017] (3) Actual working conditions are covered, and the reactor wave process test of the current mainstream connection mode can be applied

[0018] The test platform reserves a parallel expansion interface, supports the parallel operation of two reactor modules, and realizes the winding voltage response simulation under the parallel mode of the typical ultra-high voltage power grid through A-X termination lines. The measured results show that the potential distribution characteristics meet the engineering symmetry requirements, can effectively cover the mainstream operation modes such as single winding, double winding parallel and multi-module combination, has good practicality and working condition adaptability, and is suitable for wave process test and insulation design verification under different structural types and connection modes.

[0019] According to some embodiments of the present application, the high-voltage bipolar power amplifier module comprises:

[0020] A signal input unit is configured to provide a standard basic network card interface and a differential receiving circuit, and obtain a standard low-voltage transient waveform signal within ±10V from an external line;

[0021] A high-voltage output stage adopts a full-symmetrical H-bridge structure as a main amplification core, each bridge arm is composed of an upper high-voltage metal oxide semiconductor field effect transistor and a lower high-voltage metal oxide semiconductor field effect transistor or an insulated gate bipolar transistor, and the upper and lower tubes are independently controlled by a gate drive chip in terms of conduction timing;

[0022] A power supply module comprises a high-voltage direct-current power supply rail and an independent logic power supply rail;

[0023] A protection circuit comprises an output overvoltage clamping module, wherein the output overvoltage clamping module adopts a metal oxide semiconductor field effect transistor and a reverse diode to form an active clamping path to absorb a sharp voltage when an output is open or an induced back electromotive force appears;

[0024] A linear compensation unit is compensated by dynamic voltage feedback and dead-time control; a power amplifier channel has a bandwidth of more than 10MHz and a slew rate of more than 150V / μs.

[0025] According to some embodiments of the present application, the modular winding test platform comprises:

[0026] A detachable core, wherein an upper yoke of the core adopts a detachable module form and is mechanically positioned based on a bolt+positioning pin;

[0027] A pluggable winding installation module, wherein each pluggable winding installation module is prefabricated in an independent insulation clamp and is embedded into an insulation pad of a main body through a sliding groove or a buckle;

[0028] A platform support and insulation system, wherein the modular winding test platform is arranged on a rack, and an epoxy resin plate insulation support layer is arranged at the bottom of the rack.

[0029] According to some embodiments of the present application, the pluggable winding installation module can also be designed according to different wiring modes and potential response paths, and a multi-point connector interface is reserved in the installation structure to support wiring modes of end wiring or middle wiring.

[0030] According to some embodiments of the present application, the modular winding test platform is further configured with at least two groups of pluggable winding installation modules, and the pluggable winding installation modules can realize experimental structures such as series connection, parallel connection and capacitive coupling by replacing the clamps and combining positions.

[0031] According to some embodiments of the present application, the plug-in winding installation module is provided with preset point slots, and the slots are arranged at key measurement point positions, including at least one of the following positions:

[0032] Turn-to-turn voltage measurement points arranged between adjacent turns in the same coil cake;

[0033] Cake-to-cake voltage measurement points located at the junction or middle part of the upper and lower coil cakes;

[0034] Ground voltage measurement points arranged at the positions of the terminal lead, shield wire or middle connection wire;

[0035] Creepage path voltage measurement points arranged along the inner diameter side and the outer diameter side of the winding;

[0036] Injection and lead-out end voltage measurement points at the positions of the first end, the terminal and the grounding lead-out point.

[0037] According to some embodiments of the present application, the lead interface of the winding in the plug-in winding installation module is configured with a standard quick plug type conductive terminal, so that the winding can form a repeatable plug-in connection between the power amplifier output port, the voltage probe input end or the grounding resistance module.

[0038] According to some embodiments of the present application, the multi-point synchronous acquisition system includes a plurality of sensors and a data acquisition module, wherein the sensors are arranged on the key measurement points and can measure the voltage distribution synchronous measurement and high-fidelity waveform recording of each key measurement point under the action of any standard or non-standard overvoltage waveform.

[0039] The method for measuring the potential distribution of the reactor according to the second aspect of the present application uses the above-mentioned reactor potential distribution measuring device, and includes the following steps:

[0040] Excitation signal setting: generating a target impulse waveform signal through an arbitrary waveform signal generator, and raising the low-voltage waveform to the required voltage level through a power amplification module;

[0041] Winding module installation: assembling the detachable measured winding to the test platform main column;

[0042] Measurement point deployment: arranging the differential probe and the conditioning system at the key measurement points of the modular winding test platform;

[0043] Synchronous acquisition: applying the excitation signal and synchronously recording the voltage response of each measurement point;

[0044] Sample replacement: disassembling the current winding module and replacing the new sample, and repeating the test process.

[0045] Additional aspects and advantages of the present application will be given in part in the following description, part will become apparent from the following description, or will be understood by those skilled in the art through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0046] The above and / or additional aspects and advantages of the present application will become apparent and rationalized by a description of embodiments in conjunction with the following drawings, wherein:

[0047] Figure 1 The structure principle diagram of the high-voltage bipolar power amplification module in the reactor potential distribution measuring device of the embodiment of the present application;

[0048] Figure 2 The functional module structure schematic diagram of the modularized winding test platform in the reactor potential distribution measuring device of the embodiment of the present application;

[0049] Figure 3 The system block diagram of the multi-point synchronous acquisition system in the reactor potential distribution measuring device of the embodiment of the present application;

[0050] Figure 4 The step schematic diagram of the reactor potential distribution measuring method of the embodiment of the present application;

[0051] Figure 5 The method function flow schematic diagram of the reactor winding voltage distribution measuring process in the reactor potential distribution measuring method shown in the embodiment of the present application; Figure 4

[0052] The detachable upper yoke in the modularized winding test platform shown in the embodiment of the present application; Figure 6 Figure 2 The multiple reactor parallel test in the modularized winding test platform shown in the embodiment of the present application.

[0053] Figure 7 Figure 2 The multiple reactor parallel test in the modularized winding test platform shown in the embodiment of the present application. DETAILED DESCRIPTION

[0054] The embodiments of the present application are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar labels represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as the limitation of the present application.

[0055] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as the limitation of the present application.

[0056] ​​In the description of the present application, the meaning of one or more is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If the first, second is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0057] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0058] The measurement of the winding potential distribution of the reactor is an important means to evaluate its electrical performance under transient overvoltage, but the existing test system has obvious shortcomings in excitation ability and sample structure adaptability. On the one hand, the traditional test device mostly uses commercial linear power amplifiers, which are limited by device voltage resistance, power supply capacity and thermal design, and the output amplitude is usually not more than 140Vpp, which is difficult to drive the scaled model to form an engineering representative potential gradient, especially when simulating lightning impulse or short circuit impulse and other high-frequency high-amplitude waveforms, which easily leads to the winding potential response deviating from the actual operating characteristics. On the other hand, the existing scaled model is mostly integrated with customized structure, which lacks universality and replaceability, and switching between different structure windings needs to be rewound, which is low in efficiency, poor in reusability, and difficult to support systematic comparison and experimental verification.

[0059] Based on the above technical problems, the present application proposes a reactor potential distribution measuring device integrating high-voltage bipolar excitation, waveform fidelity output and reconfigurable test bench, which systematically solves the problems of insufficient excitation level, waveform distortion and difficulty in replacing the sample, and significantly improves the authenticity, flexibility and engineering adaptability of the measurement. Specifically as Figure 1 The device comprises:

[0060] A high-voltage bipolar power amplification module, a modular winding test platform and a multi-point synchronous acquisition system. Among them:

[0061] 1. High-voltage bipolar power amplification module

[0062] The high-voltage bipolar power amplification module adopts H-bridge full-bridge output topology, mainly composed of signal input unit, high-voltage output stage, power module, protection circuit and linear compensation unit, and its working principle is as shown in the accompanying Figure 1 , specifically including:

[0063] 1.1 Signal input unit: provides a standard basic network card (Bayonet Nut Connector, BNC) interface and a differential receiving circuit, which can be compatible with mainstream arbitrary waveform generators or function signal sources, and supports input of standard low-voltage transient waveform signals within ±10V, such as 1.2 / 50μs lightning waves, short-circuit jump waves, etc.

[0064] 1.2 High-voltage output stage: adopts a full-symmetrical H-bridge structure as the main amplification core, each bridge arm is composed of two high-voltage MOSFETs (Metal Oxide Semiconductor Field Effect Transistor) or IGBTs (Insulated Gate Bipolar Transistor), and the upper and lower tube conduction timing is independently controlled by a gate drive chip to realize stable adjustment of the output waveform within 300Vpp. This structure supports bidirectional polarity switching and continuous high-current driving, and is suitable for high-capacitive load characteristics.

[0065] 1.3 Power module: includes a high-voltage DC power rail and an independent logic power rail. All power modules use an isolated drive power supply scheme to maintain electrical isolation between the high-voltage and low-voltage control sides, ensuring human-machine operation safety.

[0066] 1.4 Protection circuit: integrates the following functional modules: ① current limiting protection, which monitors the output current in real time and quickly turns off the power tube; ② short-circuit self-recovery circuit, which starts the shutdown protection in the event of sudden load short circuit; ③ output overvoltage clamping module, which uses MOSFET and reverse diode to form an active clamping path to quickly absorb peak voltage when the output is open or the induced back electromotive force appears.

[0067] 1.5 Linear compensation unit: the power amplifier channel has a bandwidth of more than 10MHz and a slew rate of more than 150V / μs, and can output complete steep front waveform. Dynamic voltage feedback compensation and dead time control are introduced to ensure low distortion and low delay in the high frequency band, avoiding phenomena such as peak clipping and tail wave distortion.

[0068] The power amplification module is finally connected to the input end of the measured winding model through the output port, and can be connected in series with a matching damping resistor and a ground current limiting resistor to build a high-voltage excitation injection channel.

[0069] 2, Modular winding test platform

[0070] The modular winding test platform adopts a three-column magnetic flux symmetric structure to form the main magnetic circuit, the middle column is used to install the measured winding, and the side columns form the return magnetic path. The overall iron core is made of cold-rolled laminated silicon steel sheets, and to improve the structural flexibility and test efficiency, the modular design scheme can refer to Figure 2shown.

[0071] 2.1 detachable core

[0072] In the present application, the upper yoke of the core is in the form of a detachable module, and is mechanically positioned by bolts and positioning pins. The operator can loosen the upper yoke module without disassembling the entire core structure, thereby achieving rapid replacement of the coil device on the main column. This structure meets the switching requirements of different measured windings during multiple experiments, greatly shortening the operation time.

[0073] 2.2 pluggable winding installation module

[0074] To meet the general measurement needs of different winding structures, the test platform is equipped with multiple groups of pluggable winding installation modules. Each group of windings is pre-fabricated in an independent insulation clamp, and each group of windings is embedded in the main column insulation pad through sliding groove positioning or buckle method, supporting arbitrary combination insertion. Each group of windings supports, but is not limited to, the following structure forms: continuous type, entangled type, and inserted flower type. For different wiring methods and potential response paths, the installation structure reserves multiple-point connector interfaces, supports end-of-line or middle-of-line wiring methods, ensures signal integrity and experimental condition restoration, and at the same time, can configure two or more groups of windings in the platform to realize series, parallel, and capacitive coupling experiments. By replacing the clamp and combination position, typical engineering connection methods can be simulated.

[0075] 2.2.1 winding measurement wiring method design

[0076] To achieve full-range measurement of winding voltage distribution, the platform presets measurement point slots in various winding modules, and sets key measurement point positions in combination with winding structure. The measurement points mainly include: turn-to-turn voltage measurement points arranged between adjacent turns in the same wire cake; cake-to-cake voltage measurement points located at the junction or middle of the upper and lower wire cakes; ground voltage measurement points located at the end of the lead, shield wire, or middle connection line; creepage path voltage measurement points arranged along the inner diameter side and outer diameter side of the winding; and injection and lead-out end voltage measurement points at the first end, the end, and the grounding lead-out point. The above measurement points are used in combination with differential probe interfaces, which can accurately capture the voltage response under the action of typical shock waves.

[0077] 2.2.2 electrical interface and lead-out end design

[0078] Each group of winding lead interfaces is configured with standard fast-plug conductive terminals, forming a repeatable plug-in connection between the power amplifier output port, voltage probe input, or ground resistance module. All interface leads use differential distribution line design, with internal wire layout using a shielded twisted structure to suppress conducted interference and external electromagnetic coupling effects. The end and middle joints are provided with numbering and polarity identification, facilitating users to quickly distinguish the polarity of the wiring and reducing the risk of wiring errors; under the multi-line parallel structure, all electrical leads are guided to the front-end measurement platform through the panel, improving signal management convenience.

[0079] 2.3 Platform support and insulation system

[0080] The entire gantry bottom uses an epoxy plate insulation support layer, and the core structure is connected to the base through adjustable support columns, providing good stability and insulation safety margin under high voltage, meeting the insulation strength and mechanical support requirements under the shock wave experimental environment.

[0081] This modular test structure effectively supports the interchange testing of different coil structures, enabling measurement under multiple experimental conditions such as winding turn-to-turn potential distribution, potential difference between adjacent line cakes, and surface creepage path voltage, providing a highly adaptable test platform for the electrical performance analysis of UHV device windings.

[0082] 3. Multi-point synchronous acquisition system

[0083] The multi-point synchronous acquisition system includes sensors and data acquisition modules. The sensor arrangement and data acquisition module are used to realize synchronous measurement and high-fidelity waveform recording of the voltage distribution of the measured winding under the action of any standard or non-standard overvoltage waveform at each key measurement point. This module mainly includes active differential probes, passive differential probes, signal conditioning and isolation circuits, multi-channel high-speed acquisition cards, and upper computer control and analysis software. The specific technical scheme is attached Figure 3 . Including:

[0084] 3.1 Voltage acquisition channel design:

[0085] Each measurement point lead uses low-inductance shielded wire to lead out and is connected to the differential probe through the BNC fast-plug interface. The active differential probe is used to measure small voltage difference signals such as turn-to-turn, with an input impedance not less than 10MΩ, a measurement bandwidth ≥100MHz, and a rated input range of ±700V; the passive differential probe is used for large-level ground voltage measurement, with a wide voltage range and overload resistance. The two types of probes are arranged and combined according to the characteristics of the measurement points to ensure the accuracy of the response and the reliability of the amplitude under high-frequency shock waves.

[0086] 3.2 Signal conditioning and isolation design:

[0087] Each differential probe output signal is processed via an independent signal conditioning module, which integrates a high common-mode rejection ratio (CMRR) operational amplifier with a bandpass / lowpass filter (typical cutoff frequency of 50 MHz) for suppressing common-mode interference from the power loop, lightning induction, and external electromagnetic radiation noise. The signal link is designed with optical isolation technology and shielded wires in parallel, ensuring that the system and the test circuit are completely electrically isolated, effectively avoiding ground current and surge coupling interference.

[0088] 3.3 High-speed acquisition and control system:

[0089] After conditioning, the signals are uniformly sent to a high-speed synchronous acquisition system. The system uses a high-speed multi-channel acquisition card connected via a PXIe bus or LAN interface, supports at least 6 channels of 12-bit precision synchronous sampling, and has a sampling rate of not less than 250 MSa / s, with complete capture capability of high-frequency waveforms. The upper computer is configured with a matching control and analysis software, which has functions such as real-time waveform display, key data marking, data export, supports parallel analysis and comparison of waveforms at different measurement points, and ensures that the experimental data has completeness, traceability and engineering analysis value.

[0090] Embodiment two,

[0091] Based on the reactor potential distribution measuring device provided in the above embodiment one, the application provides a corresponding measuring method during operation, comprising the following steps:

[0092] Step S100, excitation signal setting

[0093] Excitation signal setting and injection preparation. A target impulse waveform signal is generated using an arbitrary waveform signal generator, and the low-voltage waveform is boosted to the required voltage level through a power amplification module. According to the insulation level and test requirements of the measured reactor winding, the output voltage amplitude and waveform parameters are adjusted to ensure that the excitation signal meets the lightning impulse and other working conditions.

[0094] Step S200, winding module installation

[0095] The measured winding module is installed on the main column part of the modular test platform and the positioning and fixing operation is completed. After the winding clamp is connected according to the pre-set structure, subsequent measurement point deployment and channel wiring are prepared.

[0096] Step S300, measurement point deployment

[0097] Measurement points are set at key positions of the winding structure and are connected to differential probes and conditioning systems through quick insertion ports. The measurement points cover inter-turn, inter-pie, ground, creepage path and lead-out end positions, ensuring complete coverage of the winding potential response.

[0098] Step S400, synchronous acquisition

[0099] Start the multi-channel high-speed acquisition system, and collect the voltage response data of each measuring point in real time during the application of the excitation signal. The collected data is uniformly imported into the host computer for storage and management, thereby providing a data basis for subsequent analysis.

[0100] Step S500, sample replacement

[0101] After completing the current sample test, the operator can remove the winding module and replace a new measured winding without changing the main structure of the test bench and the configuration of the acquisition system. The quick switching and repeated measurement of multiple types of reactors can be realized by replacing the clamp and module, thereby significantly improving the test efficiency and platform adaptability.

[0102] Further, in order to verify the effectiveness of the second embodiment of the present application, a specific application scenario is provided in the second embodiment of the present application. In comparison with steps S100-S500 in the first embodiment:

[0103] Step A100, excitation signal setting

[0104] The power amplification module is built and the excitation waveform is injected. An arbitrary waveform signal generator is selected to output a simulated transient waveform signal. The waveform form includes a 1.2 / 50 μs standard lightning waveform, a double exponential short-circuit jump waveform, etc. The output level is ±10 V. The signal is connected to the self-developed H-bridge full-bridge topology power amplification module. The module adopts a symmetric full-bridge output structure composed of high-voltage MOS FETs, and has a bipolar amplification function. The actual measurement amplification channel can realize a peak output of ±150 V (300 Vpp), a maximum load current of 2 A, an output bandwidth of ≥10 MHz, and a voltage slew rate of up to 150 V / μs, and can completely output a high steepness front waveform.

[0105] In order to guarantee the quality of the output waveform, the power amplification module introduces dead time control, dynamic voltage slew rate control and linear voltage feedback compensation mechanism in the drive chain, effectively suppressing nonlinear responses such as tip cutting and tail wave distortion. The module output end is connected to the measured winding inlet end through a shielding wire, and a matching damping resistance and a grounding current limiting resistance are connected to the measured winding inlet end, thereby realizing high-voltage distortionless injection of the transient excitation waveform.

[0106] Step A200, winding module installation

[0107] The test platform adopts a three-column magnetic flux symmetric structure shown in Fig. 6 to build the main magnetic circuit. The middle column is the installation position of the measured winding, and the left and right columns form the return magnetic flux path. The core material is selected from 30Q120 cold-rolled oriented silicon steel sheets, and a laminated structure is adopted. The upper yoke part of the main magnetic circuit is designed in a modular and detachable form. The operator can quickly realize the disassembly of the upper yoke by loosening the bolts and positioning pins, thereby conveniently replacing the measured winding on the main column, and the test platform is suitable for multiple experiments and sample switching.

[0108] The measured winding includes continuous, twisted and other typical structures, is pre-assembled in an independent insulation clamp, and is positioned and connected with the main column insulation layer through a sliding groove. The single winding, series or parallel combination forms shown in the attached 7 can be realized according to the experimental requirements. All the leads are connected to the power amplifier output or ground end through the fast plug-in conductive terminal, and are concentratedly led out to the front panel to access the measurement system, so that the wiring is neat and the identification is clear.

[0109] In addition, the platform reserves a parallel expansion interface to support the parallel test access of two reactor modules. When the system constructs a double-winding parallel structure, the A-X end parallel wiring can be realized through lead switching, the operating condition of the parallel reactor in the actual ultra-high voltage power grid is simulated, and the overall potential distribution characteristics are tested.

[0110] Step A300, measurement point deployment

[0111] The sensor arrangement and data acquisition system are implemented. Multiple sets of voltage measurement points are arranged at key positions such as winding interturns, wire cakes, electrode lead-out ends and connection line nodes. Each set of voltage measurement points is led to the differential probe input end through a shielded lead: active differential probes are used for interturn measurement, and high-impedance passive differential probes are used for ground measurement. The output signals of the probes are respectively input into a conditioning isolation module, processed by a high common-mode rejection ratio amplifier and an analog filter, and electrically isolated from the main acquisition system through photoelectric isolation.

[0112] The processed signals are uniformly connected to a PXIe-5171R high-speed synchronous acquisition card, which is set to a sampling rate of 250MSa / s, a resolution of 12bit, supports synchronous acquisition of more than 8 channels, and has a trigger control function. The upper computer runs a LabVIEW real-time control interface to realize waveform capture, measurement point marking, data export and comparative analysis functions, and supports multi-dimensional visualization and frequency domain analysis of experimental data.

[0113] Step A400, synchronous acquisition

[0114] The measured winding (including single body and parallel combination structure) is applied with ±150V lightning impulse excitation waveform, and the response voltage waveform of each arranged point is measured. In the experiment, the system realizes high-precision synchronous recording of multiple channels, the waveform front remains steep, the amplitude has no top distortion, the interturn and cake interturn potential distribution trends are highly consistent with the multi-physical field finite element simulation results. When the double reactor parallel structure is constructed, the measured potential distribution shows symmetrical distribution characteristics, and the voltage amplitude gradient between the end winding and the center connection point is consistent with the engineering practice, which shows that the multi-point voltage response capability of the system in simulating the parallel reactor structure has engineering representativeness.

[0115] Step A500, sample replacement

[0116] The winding is disassembled and replaced with a new one, and the above experiment process is repeated to verify that the system has good waveform restoration capability, diversified prototype adaptation capability and complete measurement link, and is suitable for potential distribution test and insulation response research of the winding of the UHV reactor under various typical working conditions such as lightning impulse and operating overvoltage.

[0117] The apparatus embodiments described above are only schematic, wherein units as described as separate components can or can not be physically separate, i.e., can be located in one place or also distributed over a plurality of network components. Some or all of the modules can be implemented as software, firmware, hardware or suitable combination thereof.

[0118] Those of ordinary skill in the art will understand that all or some of the steps, systems, and methods disclosed above can be embodied in software, firmware, hardware, or any suitable combination thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on computer-readable media, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As is well known to those of ordinary skill in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, it is common knowledge to those of ordinary skill in the art that communication media typically includes computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and can include any information delivery media.

[0119] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A device for measuring the potential distribution of a reactor, characterized in that, include: High-voltage bipolar power amplifier module, modular winding test platform, and multi-point synchronous acquisition system, including: The high-voltage bipolar power amplifier module is used to inject a high-voltage transient excitation signal into the winding under test. The modular winding test platform is used to carry the detachable and replaceable winding under test; The multi-point synchronous acquisition system is used to synchronously measure the potential response signals of each measuring point of the winding under test.

2. The apparatus according to claim 1, characterized in that, The high-voltage bipolar power amplifier module includes: The signal input unit provides a standard basic network card interface and differential receiving circuit, and can acquire standard low-voltage transient waveform signals within ±10V from external lines. The high-voltage output stage uses a fully symmetrical H-bridge structure as the main amplification core. Each bridge arm consists of two high-voltage metal-oxide-semiconductor field-effect transistors or insulated-gate bipolar transistors, and the conduction timing of the upper and lower transistors is independently controlled by the gate driver chip. The power module includes a high-voltage DC power rail and an independent logic power rail; The protection circuit includes an output overvoltage clamping module, wherein the output overvoltage clamping module uses a metal-oxide-semiconductor field-effect transistor and a reverse diode to form an active clamping path, which absorbs the peak voltage when the output is open or the induced back electromotive force occurs. The linear compensation unit uses dynamic voltage feedback compensation and dead time control; the power amplifier channel bandwidth is over 10MHz and the slew rate exceeds 150V / μs.

3. The apparatus according to claim 1, characterized in that, The modular winding test platform includes: The detachable iron core features a detachable module upper yoke, with mechanical positioning achieved using bolts and locating pins. Pluggable winding mounting modules, each prefabricated in an independent insulating clamp, are embedded into the insulating pad of the main body by a groove or snap-fit. The platform support and insulation system includes a modular winding test platform mounted on a frame, with an epoxy resin board insulation support layer at the bottom of the frame.

4. The apparatus according to claim 3, characterized in that, The pluggable winding mounting module can also be designed according to different wiring methods and potential response paths, and the mounting structure is reserved with multiple connector interfaces to support wiring methods with end entry or middle entry.

5. The apparatus according to claim 3 or 4, characterized in that, The modular winding test platform is also equipped with at least two sets of pluggable winding installation modules. The pluggable winding installation modules can achieve experimental structures such as series connection, parallel connection, and capacitive coupling by changing the clamps and combination positions.

6. The apparatus according to claim 3, characterized in that, The pluggable winding mounting module is provided with a preset point slot, and the slot is located at a key measuring point position, which includes at least one of the following positions: Inter-turn voltage measurement points are set up between adjacent turns within the same coil. Voltage measurement point between discs located at the junction of the upper and lower discs or in the middle of the disc; Voltage measurement points to ground are located at the end lead, shield wire, or middle connecting wire. Creepage path voltage measurement points are arranged along the inner and outer diameter sides of the winding; Injection and voltage measurement points at the beginning, end and grounding lead-out points.

7. The apparatus according to claim 3, characterized in that, The lead interface of the winding in the pluggable winding mounting module is equipped with a standard quick-connect conductive terminal, which enables the winding to form a repeatedly pluggable connection with the power amplifier output port, voltage probe input terminal or grounding resistor module.

8. The apparatus according to claim 6, characterized in that, The multi-point synchronous acquisition system includes several sensors and a data acquisition module. The sensors are arranged on the key measurement points and can measure the voltage distribution of each key measurement point under any standard or non-standard overvoltage waveform, and record the waveform with high fidelity.

9. A method for measuring the potential distribution of a reactor, using the reactor potential distribution measuring device described in any one of claims 1 to 8, comprising the following steps: The target impulse waveform signal is generated by an arbitrary waveform signal generator, and the low-voltage waveform is boosted to the required voltage level by a power amplifier module. The detachable winding under test is assembled onto the main column of the test platform; Differential probes and conditioning systems are installed at key testing points of the modular winding test platform; An excitation signal is applied and the voltage response at each measuring point is recorded simultaneously.

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