A double-source collaborative energy supply arc angle dynamic arc extinction test platform and method

Abstract

The application provides a double-source cooperative energy arc striking angle dynamic arc extinguishing test platform and method, on the one hand, the arc striking angle discharge process is divided into four stages of arc striking, current continuation, climbing and lengthening and extinguishing, and the high-voltage small-current arc striking source and the low-voltage large-current direct-current arc continuation source are coupled in the same arc striking angle circuit according to the time sequence, the time sequence control steps of high-voltage arc striking, direct-current current continuation, dynamic climbing and critical extinguishing, the physical process of the ground return current entering the arc channel after lightning breakdown in the actual line, that is, the dynamic process of "the direct-current current of the line after lightning breakdown turns into the arc channel", on the one hand, the synchronous test system is used for real-time acquisition and output of quantifiable design parameters: arc extinguishing length, arc extinguishing time, arc extinguishing voltage, arc extinguishing current and arc extinguishing power, which provides a basis for the design of arc striking angle gap length, electrode angle and electrode material; the application can construct a test platform equivalent to the "high-voltage arc striking superimposed direct-current large-current current continuation" scene in the laboratory.

Description

Technical Field

[0001] This application relates to the field of high-voltage power transmission and electrical engineering, and relates to, but is not limited to, a dynamic arc extinction test platform and method for dual-source coordinated power supply. Background Technology

[0002] In ultra-high voltage direct current (UHVDC) projects, the grounding electrode return line mainly carries the ground return current during bipolar unbalanced operation or unipolar ground loop operation. These lines typically operate at relatively low voltages but are exposed to outdoor lightning conditions for extended periods. Therefore, arc-generating angles are often installed at both ends of the insulators to distribute overvoltage surges. When a lightning strike or switching overvoltage occurs, the arc-generating angle discharges preferentially, releasing transient energy to the ground. Subsequently, the arc column gradually rises and elongates due to the electrode shape, thermal buoyancy, and air cooling, eventually extinguishing naturally.

[0003] Currently, arc-starting angle-related tests typically focus on insulation coordination and arc morphology observation, or conduct DC arc tests under a single power supply condition. Due to the limitations of laboratory power supply capacity, a single power supply often cannot simultaneously handle "air gap breakdown capability in the tens of kilovolt range" and "DC follow current capability in the tens to hundreds of amperes range." If only a high-voltage source is used, the current output is insufficient to simulate the large current follow current arc formed after the line current is injected through the breakdown channel; if only a high-current DC source is used, the output voltage is insufficient to stably break down the air gap at the bottom of the arc-starting angle, making it difficult to continuously simulate the complete sequence of arc ignition, follow current, creeping elongation, and final extinction.

[0004] During engineering operation, after the arcing angle breaks down under lightning strikes, the DC operating current in the grounding electrode return line may enter the discharge channel and maintain a continuous arc. Since DC arcs lack AC zero-crossing extinction conditions, the arc root will act on the electrode surface for a prolonged period and may continuously transfer heat to insulators, fittings, and conductors, potentially causing damage to line components or even line breakage. Therefore, it is necessary to construct a test platform capable of simulating a "high-voltage arcing followed by a large DC current follow-through" scenario in the laboratory to measure critical arc extinction parameters and establish criteria. Summary of the Invention

[0005] Based on the above problems, this application provides a test platform and method for dynamic arc extinction test with dual-source coordinated power supply, aiming to build a test platform in the laboratory equivalent to the scenario of "high voltage arc initiation followed by DC high current follow-through", which is convenient for subsequent measurement of critical arc extinction parameters and the formation of criteria.

[0006] The technical solution of this application embodiment is implemented as follows: In a first aspect, embodiments of this application provide a dual-source coordinated power supply dynamic arc extinction test platform. The dynamic arc extinction test platform includes: a high-voltage arc ignition source, a DC arc sustaining source, a first set of high-voltage silicon stacks, a second set of high-voltage silicon stacks, a horn-shaped arc ignition angle dedicated sample assembly, a synchronous testing system, and a current limiting protection unit. The horn-shaped arc ignition angle dedicated sample assembly includes: a first arc ignition electrode and a second arc ignition electrode arranged opposite to each other. The positive and negative output terminals of the high-voltage arc ignition source are respectively connected to the bottoms of the first and second arc ignition electrodes. The positive output terminal of the DC arc sustaining source is connected to the bottom of the first arc ignition electrode via the first set of high-voltage silicon stacks, and the negative output terminal of the DC arc sustaining source is connected to the bottom of the second arc ignition electrode via the second set of high-voltage silicon stacks and the current limiting protection unit, forming a bipolar system. A unidirectional isolation structure includes: a high-voltage arc-ignition source, used to apply a voltage sufficient to break down the arc-ignition gap formed between the first and second arc-ignition electrodes during the arc-ignition stage, so that the arc-ignition gap discharges preferentially and forms a current-limiting arc-ignition current to establish an initial arc channel; a DC arc-continuing source, used to superimpose a DC arc-continuing current onto the circuit where the initial arc channel is located during the arc-continuing stage, so as to increase the current-limiting arc-ignition current to the arc-continuing current, and sequentially enter the arc root climbing stage and the arc-extinguishing stage; and a synchronous testing system, used to synchronously acquire the arc voltage, arc current, arc root position, arc length, climbing speed, and emission spectrum during the continuous evolution process in real time; wherein, the continuous evolution process consists of the arc-ignition stage, the arc-continuing stage, the arc root climbing stage, and the arc-extinguishing stage.

[0007] In some embodiments, the ram's horn-shaped arc-arcing angle special sample assembly further includes: a first electrode adjustment component for adjusting the angle and bottom gap between the first and second arc-arcing electrodes; a second electrode adjustment component for adjusting the height and installation position of the first and second arc-arcing electrodes; and a synchronous testing system, which is also used to collect in real time, under the action of the first electrode adjustment component and / or the second electrode adjustment component, the arc voltage, arc current, arc root position, arc length, climbing speed and emission spectrum during the continuous evolution process under different combinations of angle, bottom gap, height and installation position, so as to obtain the arc dynamic process characteristic parameter set under different combinations of conditions.

[0008] In some embodiments, the arc-starting angle dynamic arc extinction test platform further includes: an analysis system for analyzing the characteristic parameter set of the arc dynamic process under different combinations of conditions, and establishing a quantitative mapping relationship between the geometric parameters of the electrode and the arc-climbing height, arc root motion and arc extinction conditions; wherein the electrode includes: a first arc-starting electrode and a second arc-starting electrode.

[0009] In some embodiments, the high-voltage arc-ignition source includes: a DC controllable power supply, a zero-voltage switch drive circuit, a step-up rectifier transformer, and a high-voltage output terminal connected in sequence; the output terminal of the DC controllable power supply is connected to the power input terminal of the zero-voltage switch drive circuit; the high-frequency AC output terminal of the zero-voltage switch drive circuit is connected to the primary winding of the step-up rectifier transformer; the positive and negative output terminals of the secondary high-voltage winding of the step-up rectifier transformer after rectification are respectively connected to the first arc-ignition electrode and the second arc-ignition electrode to apply a breakdown voltage to the arc-ignition gap.

[0010] In some embodiments, the current limiting protection unit includes: an adjustable current limiting resistor, a circuit breaker, a surge arrester, and an insulating support.

[0011] Secondly, embodiments of this application provide a dynamic arc extinction test method for arc-starting angle with dual-source coordinated power supply. The dynamic arc extinction test method for arc-starting angle is applied to any of the dual-source coordinated power supply dynamic arc extinction test platforms described above. The method includes: using a high-voltage arc-starting source during the arc-starting stage, applying a voltage sufficient to break down the arc-starting gap formed between the first and second arc-starting electrodes to allow the arc-starting gap to discharge preferentially and form a current-limiting arc-starting current to establish an initial arc channel; using a DC arc-continuing source during the continuation stage, superimposing a DC continuation current onto the circuit where the initial arc channel is located to increase the current-limiting arc-starting current to the continuation current, and sequentially entering the arc root climbing stage and the arc extinction stage; using a synchronous testing system to synchronously collect the arc voltage, arc current, arc root position, arc path length, climbing speed, and emission spectrum during the continuous evolution process in real time; wherein, the continuous evolution process consists of the arc-starting stage, the continuation stage, the arc root climbing stage, and the arc extinction stage.

[0012] The beneficial effects of the technical solutions provided in this application include at least the following: The dual-source coordinated power supply dynamic arc extinction test platform and method provided in this application embodiment includes: a high-voltage arc ignition source, a DC arc sustaining source, a first set of high-voltage silicon stacks, a second set of high-voltage silicon stacks, a horn-shaped arc ignition angle dedicated sample assembly, a synchronous testing system, and a current limiting protection unit. The horn-shaped arc ignition angle dedicated sample assembly includes: a first arc ignition electrode and a second arc ignition electrode arranged opposite to each other. The positive and negative output terminals of the high-voltage arc ignition source are respectively connected to the bottom of the first arc ignition electrode and the second arc ignition electrode. The positive output terminal of the DC arc sustaining source is connected to the bottom of the first arc ignition electrode via the first set of high-voltage silicon stacks, and the negative output terminal of the DC arc sustaining source is connected to the bottom of the second arc ignition electrode via the second set of high-voltage silicon stacks and the current limiting protection unit, forming a bipolar system. A unidirectional isolation structure includes: a high-voltage arc-ignition source, used to apply a voltage sufficient to break down the arc-ignition gap formed between the first and second arc-ignition electrodes during the arc-ignition stage, so that the arc-ignition gap discharges preferentially and forms a current-limiting arc-ignition current to establish an initial arc channel; a DC arc-continuing source, used to superimpose a DC arc-continuing current onto the circuit where the initial arc channel is located during the arc-continuing stage, so as to increase the current-limiting arc-ignition current to the arc-continuing current, and sequentially enter the arc root climbing stage and the arc-extinguishing stage; and a synchronous testing system, used to synchronously acquire the arc voltage, arc current, arc root position, arc length, climbing speed, and emission spectrum during the continuous evolution process in real time; wherein, the continuous evolution process consists of the arc-ignition stage, the arc-continuing stage, the arc root climbing stage, and the arc-extinguishing stage. In this way, on the one hand, this application divides the arc-starting angle discharge process into four stages: arc ignition, follow current, ramp-up and elongation, and extinction. It also couples the high-voltage, low-current arc ignition source and the low-voltage, high-current DC follow current arc ignition source in the same arc-starting angle circuit according to time sequence. Following the time sequence control steps of high-voltage arc ignition, DC follow current, dynamic ramp-up, and critical extinction, it equivalences the physical process of the grounding electrode return current entering the arc path after lightning breakdown in the actual circuit, i.e., the dynamic process of "the DC current of the line entering the arc path after lightning breakdown" in the actual circuit. On the other hand, it uses a synchronous testing system to collect and output quantifiable design parameters in real time: arc extinction length, arc extinction time, arc extinction voltage, arc extinction current, and arc extinction power, providing a basis for the design of the arc-starting angle gap length, electrode angle, and electrode material. Thus, it can construct a test platform in the laboratory that is equivalent to the scenario of "high-voltage arc ignition followed by superimposed DC high-current follow current," facilitating subsequent measurement of critical arc extinction parameters and the formation of criteria.

[0013] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the technical solutions provided in the embodiments of this application. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 A schematic diagram of the composition of a dual-source coordinated power supply dynamic arc extinction test platform provided in this application embodiment; Figure 2 A schematic diagram of a dynamic arc extinction test platform with dual-source coordinated power supply for arc ignition angle provided in this application embodiment; Figure 3 A field diagram of a dynamic arc extinction test platform with dual-source coordinated power supply for arc ignition angle provided in this application embodiment; Figure 4 A field diagram of the DC arc-continuing source in a dynamic arc extinction test platform with dual-source coordinated power supply provided in this application embodiment; Figure 5 A flowchart of a dynamic arc extinction test method for arc angle provided in this application embodiment; Figure 6 This is a flowchart illustrating a dynamic arc extinction test method for dual-source coordinated power supply provided in an embodiment of this application. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0016] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0017] It should be noted that the terms "first, second, and third" used in the embodiments of this application are merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first, second, and third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0018] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this application pertain. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0019] Example 1: like Figure 1 The diagram shows a schematic representation of a dual-source co-powered arc ignition angle dynamic arc extinction test platform provided in this application embodiment. The dual-source co-powered arc ignition angle dynamic arc extinction test platform 100 includes: a high-voltage arc ignition source 101, a DC arc-continuing source 102, a first set of high-voltage silicon stacks 103, a second set of high-voltage silicon stacks 104, a horn-shaped arc ignition angle dedicated sample assembly 105, a synchronous testing system 106, and a current-limiting protection unit 107. The horn-shaped arc ignition angle dedicated sample assembly 105 includes: relatively arranged... The first arc-initiating electrode 1051 and the second arc-initiating electrode 1052; the positive and negative output terminals of the high-voltage arc-initiating source 101 are respectively connected to the bottom of the first arc-initiating electrode 1051 and the second arc-initiating electrode 1052; the positive output terminal of the DC arc-continuing source 102 is connected to the bottom of the first arc-initiating electrode 1051 via the first high-voltage silicon stack 103, and the negative output terminal of the DC arc-continuing source 102 is connected to the bottom of the second arc-initiating electrode 1052 via the second high-voltage silicon stack 104 and the current-limiting protection unit 107, forming a bipolar unidirectional isolation structure; wherein: The high-voltage arc-ignition source 101 is used to apply a voltage sufficient to break down the arc-ignition gap formed between the first arc-ignition electrode 1051 and the second arc-ignition electrode 1052 during the arc-ignition stage, so that the arc-ignition gap discharges preferentially and forms a current-limiting arc-ignition current to establish an initial arc channel.

[0020] The DC arc-continuing source 102 is used to superimpose a DC arc-continuing current onto the circuit where the initial arc channel is located during the arc-continuing stage, so as to increase the current-limiting arc-starting current as the arc-continuing current, and then enter the arc root climbing stage and the arc-extinguishing stage in sequence.

[0021] The synchronous testing system 106 is used to collect arc voltage, arc current, arc root position, arc length, climbing speed and emission spectrum in real time during the continuous evolution process.

[0022] The continuous evolution process consists of the arc initiation stage, the continuation stage, the arc root climbing stage, and the arc extinguishing stage.

[0023] In some embodiments, the electrical connections within the dual-source co-powered arc extinction test platform 100 can be further referenced. Figure 2The schematic diagram shown is as follows: (1) High-voltage arc ignition source 101 ( Figure 2 The two high-voltage output terminals of the high-voltage source system shown are respectively connected to the horn-shaped arc angle special sample assembly 105 ( Figure 2 The two electrodes of the electrode unit (shown as arc angle) form an arc-starting branch.

[0024] (2) The positive and negative output terminals of the DC arc source 102 are respectively connected to: the first high-voltage silicon stack 103 and the second high-voltage silicon stack 104. Figure 2 The high-voltage silicon stack shown) and the current limiting protection unit 107 are connected to the horn-shaped arc-angle special sample assembly 105 ( Figure 2 The two electrodes of the electrode unit (shown as arc angle) form a continuous current branch.

[0025] (3) The high-voltage arc ignition source 101 and the DC arc continuation source 102 are used in the special sample assembly 105 for the horn-shaped arc ignition angle ( Figure 2 The two electrodes of the electrode unit (shown as arc angle) are coupled in sequence; during the arc ignition stage, the high-voltage arc ignition source 101 completes the air gap breakdown, and during the follow current stage, the DC follow current source 102 is closed to allow the large DC current of the same polarity to pass along the established arc path.

[0026] (4) Figure 2 The two sets of high-voltage silicon stacks (the first set of high-voltage silicon stack 103 and the second set of high-voltage silicon stack 104) are respectively arranged on the positive and negative output sides of the DC arc source 102. Their withstand voltage margin is higher than the output voltage of the high-voltage arc source 101, which can prevent the high-voltage arc voltage from being directly applied to the two ends of the rectifier bridge, filter capacitor and smoothing inductor.

[0027] (5) The high-power current-limiting resistor is connected in series with the arc of the arc-starting angle (the first arc-starting electrode 1051 and the second arc-starting electrode 1052 arranged opposite to each other) to limit the arc-starting current, and at the same time, it serves as an adjustment element to change the external characteristics of the DC source and obtain different initial arc-starting currents.

[0028] In some embodiments, the ram's horn-shaped arc-arcing angle special sample assembly 105 further includes: a first electrode adjusting member for adjusting the angle and bottom gap between the first arc-arcing electrode 1051 and the second arc-arcing electrode 1052; and a second electrode adjusting member for adjusting the height and installation position of the first arc-arcing electrode 1051 and the second arc-arcing electrode 1052. The synchronous testing system 106 is also used to collect in real time the arc voltage, arc current, arc root position, arc length, climbing speed and emission spectrum during the continuous evolution process under different combinations of opening angle, bottom gap, height and installation position under the action of the first electrode adjustment component and / or the second electrode adjustment component, so as to obtain the characteristic parameter set of the arc dynamic process under different combinations of conditions.

[0029] In some embodiments, the arc extinction test platform 100 further includes: Analysis System ( Figure 1 (not shown in the figure) is used to analyze the characteristic parameter set of the electric arc dynamic process under different combinations of conditions, and to establish a quantitative mapping relationship between the geometric parameters of the electrode and the arc climbing height, arc root motion and arc extinguishing conditions.

[0030] The electrodes include: a first arc-generating electrode 1051 and a second arc-generating electrode 1052.

[0031] In some embodiments, further reference may be made. Figure 2 As shown, the high-voltage arc-ignition source 101 includes: a DC controllable power supply, a zero-voltage switch drive circuit, a step-up rectifier transformer, and a high-voltage output terminal connected in sequence; the output terminal of the DC controllable power supply is connected to the power input terminal of the zero-voltage switch drive circuit; the high-frequency AC output terminal of the zero-voltage switch drive circuit is connected to the primary winding of the step-up rectifier transformer; the positive and negative output terminals of the secondary high-voltage winding of the step-up rectifier transformer after rectification are respectively connected to the first arc-ignition electrode and the second arc-ignition electrode, for applying a breakdown voltage to the arc-ignition gap.

[0032] In some embodiments, the current limiting protection unit 107 includes: an adjustable current limiting resistor, a circuit breaker, a surge arrester, and an insulating support.

[0033] Here, based on Figure 2 The schematic diagram shown can be used as a reference. Figure 3 and Figure 4 The on-site diagram shown illustrates that the dual-source coordinated power supply dynamic arc extinction test platform 100 involves the following units: (1) High-voltage arc ignition source 101 ( Figure 3 The high-voltage source system shown includes: a DC controllable power supply, a zero-voltage switching (ZVS) drive circuit, a step-up rectifier transformer, and a high-voltage output terminal. This system applies a high voltage and a small current to the minimum gap at the bottom of the arc-starting angle electrodes formed by the opposing first arc-starting electrode 1051 and second arc-starting electrode 1052, causing the air gap to discharge preferentially and forming a small-current arc. Preferably, the output DC high voltage is 10kV to 20kV.

[0034] (2) DC arc source 102 (e.g.) Figure 4 (As shown in the field diagram): It includes a three-phase AC input terminal, a three-phase full-wave rectifier bridge, a smoothing inductor, a filter capacitor, a charging resistor, a circuit breaker, a surge arrester, and an output terminal, used to superimpose a DC freewheeling current onto the same discharge circuit after arc formation. Preferably, a three-phase 380V AC input is rectified to obtain approximately 560V DC voltage, and the output current range is 10A to 220A.

[0035] (3) High-voltage isolation unit: includes two sets of high-voltage silicon stacks (first set of high-voltage silicon stack 103 and second set of high-voltage silicon stack 104) connected in series at the positive and negative output terminals of DC arc source 102, respectively, and configured with unidirectional conductive direction according to the polarity of the current flow, so that the working current flow direction maintains a low-resistance path, while forming a cutoff barrier against the reverse impact from the high-voltage arc source 101, thereby reducing the impact of the high-voltage side on the low-voltage high-current DC source.

[0036] (4) Current limiting protection unit 107: includes a high-power adjustable current limiting resistor, circuit breaker, surge arrester and necessary insulation support components connected in series in the DC arc-continuing circuit. The current limiting resistor is preferably adjustable from 2.5Ω to 55Ω to control the arc-continuing current and the external characteristic slope of the power supply.

[0037] (5) Horn-shaped arc-angle special sample assembly 105: A replaceable arc-angle sample assembly, including a first arc-angle electrode 1051, a second arc-angle electrode 1052, an insulating support and an electrode mounting adjustment component; the first arc-angle electrode 1051 and the second arc-angle electrode 1052 are arranged opposite to each other to form a minimum bottom arc-starting gap and an arc-climbing gap that gradually increases along the electrode extension direction; the electrode mounting adjustment component is used to adjust the electrode angle, bottom gap, electrode height and electrode installation position.

[0038] (6) Synchronous test system 106: may include a digital oscilloscope, a high-voltage probe, a resistance-voltage measurement channel, a high-speed camera, a fiber optic spectrometer, and a synchronous triggering unit, used to synchronously record arc voltage, arc current, arc root position, arc length, climbing speed, and emission spectrum. The synchronous test system 106 is preferably powered by an isolation transformer to avoid forming a shunt loop at the common terminal of the oscilloscope.

[0039] In some embodiments, the test methods inside the dual-source coordinated power supply dynamic arc extinction test platform 100 are as follows: Figure 5 The steps shown are as follows: 501. Begin.

[0040] 502. Constructing the test platform: This involves assembling a high-voltage arc-initiating source 101, a DC arc-continuing source 102, arc-initiating angle electrodes (a first arc-initiating electrode 1051 and a second arc-initiating electrode 1052 arranged opposite each other), and a synchronous test system 106, all connected in isolation via a first set of high-voltage silicon stacks 103 and a second set of high-voltage silicon stacks 104. This also involves: the angle between the first arc-initiating electrode 1051 and the second arc-initiating electrode 1052, the bottom gap, and the current-limiting resistor parameters; verifying the polarity and grounding status of the high-voltage silicon stacks, and the isolation power supply conditions of the synchronous test system 106.

[0041] 503. Test conditions: Open air environment: 1 standard atmosphere, temperature 35℃, relative humidity 80%, no wind.

[0042] 504. Install and adjust the sample: adjust the angle, bottom gap, and current-limiting resistor parameters, etc.

[0043] 505. Connect the measurement system: use an oscilloscope to measure voltage / current; use a high-speed camera to record the arc climbing process; and use a spectrometer to collect emission spectra.

[0044] 506. Connect the high-voltage source system: break down the arc at the shortest gap at the bottom of the arc angle to form a small current to initiate the arc.

[0045] 507. Closing DC source system: Low-voltage high current is superimposed on the same discharge circuit to form a DC continuous arc.

[0046] 508. Dynamic arc climbing: Under the action of electromagnetic force and thermal buoyancy, the arc climbs upward along the arc angle, and the arc path is lengthened. That is, the continuous arc moves upward along the horn-shaped arc angle under the combined action of electromagnetic force, thermal buoyancy and electrode geometric constraints. The arc path gradually lengthens, the arc path resistance increases, the arc current decreases and the arc voltage increases accordingly.

[0047] 509. Synchronous testing throughout the entire process: Record dynamic voltage, current, dynamic resistance, dynamic power, arc length, arc climbing time, and emission spectrum. Here, the arc root position, arc length, and climbing speed can be obtained from the high-speed images.

[0048] The dual-source coordinated power supply dynamic arc extinction test platform provided in this application includes: a high-voltage arc ignition source, a DC arc sustaining source, a first set of high-voltage silicon stacks, a second set of high-voltage silicon stacks, a horn-shaped arc ignition angle dedicated sample assembly, a synchronous testing system, and a current limiting protection unit. The horn-shaped arc ignition angle dedicated sample assembly includes: a first arc ignition electrode and a second arc ignition electrode arranged opposite to each other. The positive and negative output terminals of the high-voltage arc ignition source are respectively connected to the bottom of the first arc ignition electrode and the second arc ignition electrode. The positive output terminal of the DC arc sustaining source is connected to the bottom of the first arc ignition electrode via the first set of high-voltage silicon stacks, and the negative output terminal of the DC arc sustaining source is connected to the bottom of the second arc ignition electrode via the second set of high-voltage silicon stacks and the current limiting protection unit, forming a bipolar unidirectional isolation structure. The system comprises: a high-voltage arc-ignition source, used to apply a voltage sufficient to break down the arc-ignition gap formed between the first and second arc-ignition electrodes during the arc-ignition stage, so that the arc-ignition gap discharges preferentially and forms a current-limiting arc-ignition current to establish the initial arc channel; a DC arc-continuing source, used to superimpose a DC arc-continuing current onto the circuit where the initial arc channel is located during the arc-continuing stage, so as to increase the current-limiting arc-ignition current to the arc-continuing current, and sequentially enter the arc root climbing stage and the arc-extinguishing stage; and a synchronous testing system, used to synchronously acquire the arc voltage, arc current, arc root position, arc path length, climbing speed, and emission spectrum in real time during the continuous evolution process; wherein, the continuous evolution process consists of the arc-ignition stage, the arc-continuing stage, the arc root climbing stage, and the arc-extinguishing stage. In this way, on the one hand, this application divides the arc-starting angle discharge process into four stages: arc ignition, follow current, ramp-up and elongation, and extinction. It also couples the high-voltage, low-current arc ignition source and the low-voltage, high-current DC follow current arc ignition source in the same arc-starting angle circuit according to time sequence. Following the time sequence control steps of high-voltage arc ignition, DC follow current, dynamic ramp-up, and critical extinction, it equivalences the physical process of the grounding electrode return current entering the arc path after lightning breakdown in the actual circuit, i.e., the dynamic process of "the DC current of the line entering the arc path after lightning breakdown" in the actual circuit. On the other hand, it uses a synchronous testing system to collect and output quantifiable design parameters in real time: arc extinction length, arc extinction time, arc extinction voltage, arc extinction current, and arc extinction power, providing a basis for the design of the arc-starting angle gap length, electrode angle, and electrode material. Thus, it can construct a test platform in the laboratory that is equivalent to the scenario of "high-voltage arc ignition followed by superimposed DC high-current follow current," facilitating subsequent measurement of critical arc extinction parameters and the formation of criteria.

[0049] The following describes the above-mentioned dual-source coordinated power supply dynamic arc extinction test platform with an arc angle of arcing angle in conjunction with a specific embodiment. However, it should be noted that this specific embodiment is only for better illustration of this application and does not constitute an improper limitation of this application.

[0050] Example 1: Critical arc extinction parameter test under 200A arc-continuing current: A high-voltage arc-initiating unit outputs 20kV DC high voltage to first break down the minimum gap at the bottom of the horn-shaped arc-initiating electrode, generating a small current of approximately 0.6A to initiate the arc. Then, a low-voltage, high-current DC arc-continuing unit is switched on, and the initial arc-continuing current is adjusted from 0.6A to approximately 200A through a current-limiting resistor. After the arc is established, it climbs upwards along the electrode, with the dynamic voltage gradually increasing and the dynamic current gradually decreasing. When the waveform reaches an inflection point, the arc-extinguishing parameters are recorded: arc length approximately 240mm, arc voltage approximately 293.18V, arc current approximately 116.92A, arc duration approximately 176.9ms, and arc power approximately 35.17kW.

[0051] Example 2: Comparative test of different initial arc currents: Keeping the electrode structure and environmental conditions constant, the initial arc-continuing current was set to 10A, 50A, 100A, 150A, and 200A, respectively. High-speed imaging shows that the larger the arc-continuing current, the more vigorous the arc combustion, and the greater the arc climbing height and extinguishing length. The corresponding extinguishing lengths are approximately 55mm, 110mm, 170mm, 200mm, and 240mm. From this, a functional relationship can be established between the extinguishing length, extinguishing voltage, extinguishing current, and initial arc-continuing current.

[0052] Example 3: Comparative test of arc climbing ability at different electrode angles: Under an initial arc current of approximately 200A, horn-shaped arc-up electrodes with angles of 7°, 15°, 25°, and 45° were installed. Experiments showed that when the electrode angle was smaller, the magnetic field between the electrodes was concentrated, making it easier for the arc to climb upwards along the electrodes; when the electrode angle was too large, such as 45°, the arc root's upward climbing ability significantly decreased. However, under the same arc current, the critical arc extinction length was still largely determined by the current level, with the angle primarily affecting the climbing path and evacuation capability. Therefore, in engineering applications, the electrode angle should not be too large or too small, and a balance should be struck between extending the arc path and maximizing the upward driving force at the arc root.

[0053] Based on the above description, this application can solve the following problems in the prior art: (1) A test platform is provided in which a high-voltage arc-starting source and a high-current arc-continuing source can be coupled in a controlled manner in the same discharge circuit, which solves the problem that a single power supply cannot simultaneously meet the requirements of high-voltage breakdown of the air gap and DC high-current continuation.

[0054] (2) Provides a unidirectional isolation protection structure to suppress the backflow of energy from the high voltage arc-starting side, and to prevent impact or damage to the low voltage high current DC source.

[0055] (3) Provide a test device that can simultaneously acquire dynamic voltage, current, high-speed images and emission spectra, and extract arc extinction length, arc extinction time, arc extinction voltage, arc extinction current and arc extinction power accordingly.

[0056] The dual-source coordinated power supply dynamic arc extinction test platform provided in this application involves the following technical solutions: (1) Dual-source timing coupling structure: The high-voltage low-current source completes the arc ignition, and the low-voltage high-current source provides the follow current. The two are coupled in stages in the same discharge circuit at both ends of the arc ignition angle electrode to solve the problem that the voltage and current capabilities of a single power supply are difficult to balance.

[0057] (2) Bipolar unidirectional isolation structure: High voltage silicon stacks are set at both the positive and negative output terminals of the DC arc source, and the polarity configuration enables the freewheeling current to enter the arc path, while preventing the high voltage arc-starting side impact from being applied to the core device of the DC source in reverse.

[0058] (3) Current limiting resistor and DC source external characteristic adjustment structure: The range of arc current is controlled by a high-power adjustable current limiting resistor, and the slope of the power supply external characteristic is changed at the same time, providing an adjustable boundary for studying the dynamic arc stability point, instability point and arc extinction conditions.

[0059] (4) Replaceable or adjustable angle horn-shaped electrode structure: By combining different electrode angles, bottom gaps and electrode lengths, the platform can compare the effects of electrode geometry parameters on arc climbing height, arc root movement and arc extinguishing conditions.

[0060] (5) Synchronous multi-physical quantity test structure: The oscilloscope, high-speed camera and spectrometer are synchronized by trigger signal to realize the correlation analysis of electrical parameters, image parameters and spectral parameters at the same time.

[0061] (6) Full-stage continuous test method: according to the timing control steps of high voltage arc initiation, DC follow-up, dynamic climb and critical extinction, the physical process of the grounding electrode return current entering the arc channel after lightning breakdown in the actual line is equivalent to that in the actual line.

[0062] Correspondingly, this application can bring the following technical effects: (1) Reduce the difficulty of power supply implementation: By combining a high-voltage, low-current arc-starting source with a low-voltage, high-current arc-continuing source, it is not necessary to construct a single high-power power supply with both tens of kilovolts and hundreds of amperes output capability.

[0063] (2) Improve the engineering equivalence of the test scenario: The arc process covers four stages: arc initiation, current continuation, ramp-up and extinction, which corresponds to the process of DC current entering the arc channel after the arc angle is broken down by lightning in the actual line.

[0064] (3) Protect DC power source equipment: The bipolar high voltage silicon stack isolation structure can form a one-way barrier against high voltage side impact, preventing low voltage and high current devices such as three-phase rectifier bridge, filter capacitor and smoothing inductor from being subjected to reverse high voltage.

[0065] (4) Output quantifiable design parameters: The platform can directly obtain the arc extinguishing length, arc extinguishing time, arc extinguishing voltage, arc extinguishing current and arc extinguishing power, providing a basis for the design of arc extinguishing angle gap length, electrode angle and electrode material.

[0066] (5) Support for multi-factor comparison tests: By changing the initial arc current, current limiting resistor, electrode angle, bottom gap and environmental conditions, a systematic arc angle optimization test system can be formed.

[0067] This platform can operate within a range of 20kV arc initiation voltage, approximately 560V DC arc sustaining voltage, and 10A to 220A arc sustaining current. When the initial arc sustaining current is approximately 200A, the obtained critical arc extinction parameters are approximately: arc length 240mm, arc extinction voltage 293.18V, arc extinction current 116.92A, arc extinction time 176.9ms, and arc extinction power 35.17kW. These data demonstrate that the platform can capture the continuous evolution of the arc from a stable rise to a critical interruption state within the laboratory.

[0068] Based on the same inventive concept, embodiments of this application also provide, for example... Figure 6 The diagram shows a flowchart of a dual-source coordinated power supply method for dynamic arc extinction testing at the arc-starting angle. This dual-source coordinated power supply method is applied to the dual-source coordinated power supply dynamic arc extinction testing platform provided in any of the above embodiments. The method includes: Step 601: During the arc ignition stage, a voltage sufficient to break down the arc ignition gap is applied to the arc ignition gap formed between the first and second arc ignition electrodes using a high-voltage arc ignition source, so as to establish an initial arc channel.

[0069] Step 602: During the follow-up phase, the DC follow-up current is superimposed on the circuit where the initial arc channel is located using the DC follow-up source to increase the current-limited arc-starting current as the follow-up current, and then enters the arc root climbing stage and the arc extinguishing stage in sequence.

[0070] Step 603: Use a synchronous testing system to collect data in real time on the arc voltage, arc current, arc root position, arc length, climbing speed, and emission spectrum during the continuous evolution process.

[0071] The continuous evolution process consists of the arc initiation stage, the continuation stage, the arc root climbing stage, and the arc extinguishing stage.

[0072] It should be noted that the descriptions of the above method embodiments are similar to those of the above platform embodiments, and have similar beneficial effects. For technical details not disclosed in the system embodiments of this application, please refer to the descriptions of the platform embodiments of this application for understanding.

[0073] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0074] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0075] In the several embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0076] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units. They may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of the embodiments of this application, depending on actual needs.

[0077] In addition, each functional unit in the various embodiments of this application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0078] Alternatively, if the integrated units described above are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to related technologies, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause the device automatic test line to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROMs, magnetic disks, or optical disks.

[0079] The methods disclosed in the several method embodiments provided in this application can be arbitrarily combined without conflict to obtain new method embodiments.

[0080] The features disclosed in the several method or platform embodiments provided in this application can be arbitrarily combined without conflict to obtain new method or platform embodiments.

[0081] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dynamic arc extinction test platform with dual-source coordinated power supply, characterized in that, The dynamic arc extinction test platform for arc ignition angle includes: a high-voltage arc ignition source, a DC arc sustaining source, a first set of high-voltage silicon stacks, a second set of high-voltage silicon stacks, a horn-shaped arc ignition angle dedicated sample assembly, a synchronous testing system, and a current limiting protection unit; the horn-shaped arc ignition angle dedicated sample assembly includes: a first arc ignition electrode and a second arc ignition electrode arranged opposite to each other; the positive and negative output terminals of the high-voltage arc ignition source are respectively connected to the bottom of the first arc ignition electrode and the second arc ignition electrode; the positive output terminal of the DC arc sustaining source is connected to the bottom of the first arc ignition electrode via the first set of high-voltage silicon stacks, and the negative output terminal of the DC arc sustaining source is connected to the bottom of the second arc ignition electrode via the second set of high-voltage silicon stacks and the current limiting protection unit, forming a bipolar unidirectional isolation structure; wherein: A high-voltage arc-ignition source is used to apply a voltage sufficient to break down the arc-ignition gap formed between the first and second arc-ignition electrodes during the arc-ignition stage, so that the arc-ignition gap discharges preferentially and forms a current-limiting arc-ignition current to establish an initial arc channel. A DC arc-continuing source is used to superimpose a DC arc-continuing current onto the circuit where the initial arc channel is located during the arc-continuing phase, so as to increase the current-limiting arc-starting current to the arc-continuing current, and then enter the arc root climbing stage and the arc-extinguishing stage in sequence. The synchronous testing system is used to collect data in real time on the arc voltage, arc current, arc root position, arc length, climbing speed, and emission spectrum during the continuous evolution process. The continuous evolution process consists of the arc initiation stage, the continuation stage, the arc root climbing stage, and the arc extinguishing stage.

2. The dynamic arc extinction test platform according to claim 1, characterized in that, The ram's horn-shaped arc-arcing angle special sample assembly also includes: a first electrode adjusting component for adjusting the angle between the first arc-arcing electrode and the second arc-arcing electrode and the bottom gap; and a second electrode adjusting component for adjusting the height and installation position of the first arc-arcing electrode and the second arc-arcing electrode. The synchronous testing system is also used to collect, in real time, the arc voltage, arc current, arc root position, arc length, climbing speed and emission spectrum during the continuous evolution process under different combinations of opening angle, bottom gap, height and installation position under the action of the first electrode adjustment component and / or the second electrode adjustment component, so as to obtain the characteristic parameter set of the arc dynamic process under different combinations of conditions.

3. The dynamic arc extinction test platform according to claim 2, characterized in that, The arc extinction test platform also includes: The analysis system is used to analyze the characteristic parameter set of the electric arc dynamic process under different combinations of conditions, and to establish a quantitative mapping relationship between the geometric parameters of the electrode and the arc climbing height, arc root motion and arc extinguishing conditions. The electrodes include: a first arc-generating electrode and a second arc-generating electrode.

4. The dynamic arc extinction test platform according to claim 1, characterized in that, The high-voltage arc-ignition source includes: a DC controllable power supply, a zero-voltage switch drive circuit, a step-up rectifier transformer, and a high-voltage output terminal connected in sequence; the output terminal of the DC controllable power supply is connected to the power input terminal of the zero-voltage switch drive circuit; the high-frequency AC output terminal of the zero-voltage switch drive circuit is connected to the primary winding of the step-up rectifier transformer; the positive and negative output terminals of the secondary high-voltage winding of the step-up rectifier transformer after rectification are connected to the first arc-ignition electrode and the second arc-ignition electrode, respectively, to apply a breakdown voltage to the arc-ignition gap.

5. The dynamic arc extinction test platform according to claim 1, characterized in that, The current limiting protection unit includes: an adjustable current limiting resistor, a circuit breaker, a surge arrester, and an insulating support.

6. A test method for dynamic arc extinction at the arc angle using dual-source coordinated power supply, characterized in that, The arc-starting angle dynamic arc extinction test method is applied to the dual-source coordinated power supply dynamic arc-starting angle arc extinction test platform as described in any one of claims 1 to 5; the method includes: During the arc ignition stage, a voltage sufficient to break down the arc ignition gap is applied to the arc ignition gap formed between the first and second arc ignition electrodes using a high-voltage arc ignition source, so as to establish an initial arc channel. During the follow-through phase, a DC follow-through current is superimposed on the circuit where the initial arc channel is located by using a DC follow-through source to increase the current-limited arc-starting current as the follow-through current, and then enters the arc root climbing stage and the arc extinguishing stage in sequence. The arc voltage, arc current, arc root position, arc length, climbing speed, and emission spectrum during the continuous evolution process are collected in real time using a synchronous testing system. The continuous evolution process consists of the arc initiation stage, the follow-through stage, the arc root climbing stage, and the arc extinction stage.

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