CN215375642U - Synchronous observation system for multiple physical quantities of long air gap discharge - Google Patents
Synchronous observation system for multiple physical quantities of long air gap discharge Download PDFInfo
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- CN215375642U CN215375642U CN202120650924.1U CN202120650924U CN215375642U CN 215375642 U CN215375642 U CN 215375642U CN 202120650924 U CN202120650924 U CN 202120650924U CN 215375642 U CN215375642 U CN 215375642U
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Abstract
The utility model discloses a long air gap discharge multi-physical quantity synchronous observation system which comprises a current measuring device, an electric field measuring device and a schlieren observation device, wherein a current measuring resistor of the current measuring device is connected in series between a Marx impulse voltage generator and a discharge ball, a VHF antenna is arranged beside the Marx impulse voltage generator, receives a VHF signal generated by the breakdown and boosting of a ball gap of the Marx impulse voltage generator and outputs a synchronous signal through a trigger of an oscilloscope, and the current measuring device, the electric field measuring device and the schlieren observation device are synchronized for recording. The VHF antenna is arranged to collect the VHF signal generated by the Marx impulse voltage generator ball gap breakdown before the long air gap is broken down and discharged, and the signal is used as the synchronous starting reference signal, so that the accuracy of signal collection in the long air gap discharge streamer-pilot conversion physical process is improved.
Description
Technical Field
The utility model belongs to the technical field of high voltage testing, relates to a long air gap discharge multi-physical quantity synchronous observation system, and particularly relates to a long air gap discharge stream-pilot conversion multi-physical quantity synchronous observation system.
Background
In the technical field of external insulation of a power system, long air gap discharge mechanism research is the basis of external insulation design and lightning shielding performance analysis of a high-voltage project of the power system, and the streamer-pilot conversion is the main reason for causing the nonlinear relation between the air gap discharge characteristic and the gap size. In the research process, the applicant finds that if the understanding of the physical process of the streamer-pilot conversion in the long air gap discharge is to be improved, a continuously perfect observation means of the characteristic attribute and the key physical parameter in the streamer-pilot conversion process in the long air gap discharge is required. The long air gap discharge streamer-pilot conversion process has a plurality of complex physical problems, including observation of thermodynamic behavior of streamer stems in the conversion process, space-time distribution of charged particle concentration, transient change processes of space electric field and current and the like, and the problem of synchronous measurement of a plurality of key physical quantities is involved. The collection process is performed by different methods and means. According to the knowledge of the applicant, the observation of the prior stream-guide conversion process in the long air gap discharge focuses on the improvement of the performance of the observation means of a single physical quantity, although the observation means of a single physical quantity focuses on the improvement of the performance of the observation means of a single physical quantity and makes great progress based on the modern electrical measurement technology, optical observation technology and photoelectric transmission technology; for this reason, publication No. CN 102608503 a discloses "a long air gap discharge high-precision synchronous observation method and system", although the system adopts a plurality of different devices to realize acquisition of different physical quantities, for the synchronous start signal, it adopts a high-speed trigger to receive the impulse voltage wave generated by the impulse voltage generator, and output a trigger signal that can be recognized by other devices; the impulse voltage waveform signal is output by the discharge voltage measuring device, so that the generation of the impulse voltage waveform signal can be confirmed to indicate that the long air gap is broken down, the starting signal is delayed at the moment, the acquired data obviously cannot include the whole process of the breakdown, and obviously, the starting mode has the problem of synchronous starting signal error, and further the error of an analysis result is caused.
Disclosure of Invention
The utility model aims to provide a long air gap discharge multi-physical quantity synchronous observation system, which is characterized in that a VHF (very high frequency) antenna is arranged to collect a VHF signal generated by a discharge ball before a long discharge air gap is punctured and discharged to generate an impact voltage waveform, and the signal is used as a synchronous starting reference signal, so that the accuracy, the authenticity and the objectivity of signal collection in the long air gap discharge stream-pilot conversion physical process are improved.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
a multi-physical-quantity synchronous observation system for long-air-gap discharge comprises a current measuring device, an electric field measuring device and a schlieren observation device, wherein a current measuring resistor of the current measuring device is connected in series between a Marx impulse voltage generator and a discharge ball, an electric field measuring sensor of the electric field measuring device is arranged in a long discharge air gap of the discharge ball, an ICCD high-speed camera of the schlieren observation device is arranged beside the long discharge air gap through a schlieren acquisition device, a VHF antenna is arranged beside the Marx impulse voltage generator, the output of the VHF antenna is connected with an oscilloscope, the VHF antenna receives a VHF signal generated by the breakdown and boosting of the ball gap of the Marx impulse voltage generator, the output of the oscilloscope is connected with a multi-channel digital delay trigger, a plurality of trigger channels of the multi-channel digital delay trigger are respectively connected with the current measuring device, the electric field measuring device and the schlieren observation device, the trigger output of the oscilloscope sends out a synchronous signal according to the received VHF signal, and synchronizes the observation records of the current measuring device, the electric field measuring device and the schlieren observation device.
The scheme is further as follows: the current measuring device, the electric field measuring device and the schlieren observing device are respectively connected with a computer to store synchronous observation record signals.
The scheme is further as follows: the current measuring device is used for measuring the streamer-pilot conversion current waveform on a high-potential electrode in a long air discharge gap and comprises a high-potential acquisition module and a low-potential receiving module, wherein the current measuring resistor is connected with a coaxial resistor attenuator, the coaxial resistor attenuator is connected with the high-potential acquisition module through a coaxial cable, the high-potential acquisition module is connected with the low-potential receiving module, and the current measuring resistor is a non-inductive sampling resistor formed by connecting multiple resistors in parallel.
The scheme is further as follows: the high potential acquisition module and the low potential receiving module are connected in a photoelectric isolation transmission mode through a photoelectric conversion circuit and an optical fiber cable.
The scheme is further as follows: the electric field measuring sensor is a photoelectric integrated sensor, and the electric field measuring device receives field intensity waveform signals of the electric field measuring sensor in a photoelectric isolation transmission mode through an optical fiber cable.
The scheme is further as follows: the schlieren acquiring device comprises an adjustable extended light source, a main lens, an adjustable knife edge and an imaging objective lens, wherein the main lens is divided into a first lens and a second lens, the first lens and the second lens are respectively arranged on two opposite sides of a long discharge air gap, light emitted by the adjustable extended light source penetrates through the first lens and penetrates through the long discharge air gap to the second lens, the adjustable knife edge and the imaging objective lens are sequentially arranged behind the second lens, the adjustable knife edge is used for adjusting the amount of the light which penetrates through the adjustable extended light source, and an ICCD high-speed camera is arranged behind the imaging objective lens and is used for acquiring schlieren optical images.
Compared with the prior art, the utility model has the beneficial effects that: the VHF (very high frequency) antenna is arranged to collect a VHF signal generated by the ball gap breakdown of the Marx impulse voltage generator before the long air gap is broken down and discharged, and the signal is used as a synchronous starting reference signal, so that the accuracy of collecting the long air gap discharge stream-pilot conversion physical process signal is improved.
The system and the method provided by the utility model can realize synchronous observation of multiple physical quantities such as stem temperature, thermodynamic radius, discharge current of the stream, electrode surface electric field, discharge optical mechanical form and the like at any moment in the long air gap discharge stream-pilot conversion process.
The utility model combines various modularized measuring devices, establishes a synchronous observation system suitable for long air gap discharge flow-pilot conversion multiple physical quantities based on extracting a VHF signal generated by Marx impulse voltage generator ball gap breakdown as a synchronous starting reference signal, is favorable for comprehensively and accurately obtaining the physical mechanism and characteristic parameters of the long air gap discharge flow-pilot conversion process, is favorable for obtaining the synchronous data of the stem temperature and thermodynamic radius, the discharge current of the flow, the surface electric field of the electrode and the discharge optical mechanical form at any moment in the long air gap discharge flow-pilot conversion process, and realizes the real recurrence and physical simulation of the physical change process, thereby achieving the purpose of improving the authenticity and objectivity of the long air gap discharge flow-pilot conversion physical process.
The concrete expression is as follows:
1) the current measuring device, the electric field measuring device and the schlieren-ICCD observing device are controlled by the trigger with time delay control, so that each physical quantity acquiring device in the long air gap discharge stream-pilot conversion process can be stably triggered, the generation of real objects by manual operation is avoided, and the reliability of the whole observing system is improved;
2) the observation system adopts a modularized design, so that observation means can be conveniently added or deleted when needed, and the adaptability of the observation system is enhanced;
3) the observation system realizes high-precision synchronization, can realize the data synchronization of an optical image, a current signal and an electric field signal of the schlieren-ICCD observation device, and overcomes the defect that the conventional long air gap discharge streamer-pilot conversion observation system cannot realize the high-precision synchronization of the optical image and an electrical measurement result.
The utility model is described in further detail below with reference to the figures and examples.
Drawings
FIG. 1 is a schematic diagram of the system configuration around a long air discharge gap device in accordance with the present invention;
FIG. 2 is a schematic diagram of the system synchronization device connection of the present invention;
FIG. 3 is a schematic block diagram of a current measuring device of the present invention;
FIG. 4 is a timing control diagram according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present embodiment, it should be noted that the terms "connected" and "disposed" should be interpreted broadly, for example, the "connection" may be a wire connection or a mechanical connection; the 'placing' can be fixedly connected placing or integrally formed placing. The specific meanings of the above terms in the present embodiment can be understood by those of ordinary skill in the art according to specific situations.
A synchronous observation system for multiple physical quantities in long air gap discharge is disclosed, as shown in FIG. 1 and FIG. 2, the system comprises a current measuring device 1, an electric field measuring device 2 and a schlieren observation device 3, a current measuring resistor 101 of the current measuring device is connected in series between a Marx impulse voltage generator 4 and a discharge ball 5, an electric field measuring sensor 201 of the electric field measuring device is arranged in a discharge long air gap 6 of the discharge ball, an ICCD high-speed camera 301 of the schlieren observation device is arranged beside the discharge long air gap 6 through a schlieren acquisition device 302, the schlieren acquisition device comprises an adjustable extended light source 302-1, a main lens, an adjustable knife edge 302-2 and an imaging objective lens 302-3, the main lens is divided into a first lens 302-4 and a second lens 302-5, the first lens 302-4 and the second lens 302-5 are respectively arranged at two opposite sides of the discharge long air gap 6, the light emitted by the adjustable extended light source penetrates through the first lens and penetrates through the long discharge air gap to the second lens, the adjustable knife edge 302-2 and the imaging objective lens 302-3 are sequentially arranged behind the second lens 302-5, the adjustable knife edge is used for adjusting the light transmission amount, and the ICCD high-speed camera 301 is arranged behind the imaging objective lens 302-3 and used for acquiring a schlieren optical image; the method is characterized in that a VHF (very High frequency) antenna 7 is arranged beside a Marx impulse voltage generator 4, the output of the VHF antenna 7 is connected with an oscilloscope 8, the VHF antenna receives a VHF signal generated by the breakdown and boosting of a ball gap of the Marx impulse voltage generator 4, the Marx impulse voltage generator 4 is a known technology and achieves the discharge breakdown voltage of a long air gap of a discharge ball through the multi-level ball gap stepwise breakdown and boosting, as shown in figure 1, the multi-level ball gap comprises g1, g2, g3 and g0, g1 is an ignition ball gap, g2 and g3 are middle ball gaps, g0 is an isolation ball gap, the boosting process is a ball gap stepwise breakdown process, and an input voltage U is an adjustable voltage to adapt to different voltage outputs. As shown in fig. 2, the output of the trigger of the oscilloscope 8 is connected to a multi-channel digital delay trigger 9, and a plurality of trigger channels of the multi-channel digital delay trigger 9 are respectively connected to the current measuring device 1, the electric field measuring device 2 and the striae observation device 3, and then are respectively connected to the computer 10 for storing the synchronous observation recording signals. The trigger output of the oscilloscope sends out a synchronous signal according to the received VHF signal, and synchronizes the observation records of the current measuring device, the electric field measuring device and the schlieren observation device. The multi-channel digital delay flip-flop 9 is a four-channel digital delay pulse flip-flop with the model of DG 535.
The current measuring device 1 is used for measuring the streamer-lead conversion current waveform on the high-potential electrode in the long air discharge gap, as shown in fig. 3: the current measuring device 1 comprises a current measuring resistor 101, a coaxial resistor attenuator 102, a high potential acquisition module 103 and a low potential receiving module 104, wherein the current measuring resistor 101 is used for converting current injected into a channel in the discharging process into a voltage signal, and the current measuring resistor is a thick film resistor with large resistance value, high power and low inductance. The current measuring resistor 101 is connected with the coaxial resistor attenuator 102, the coaxial resistor attenuator 102 is connected with the high potential acquisition module 103 through a coaxial cable, the coaxial resistor attenuator 102 attenuates a voltage signal and then sends the voltage signal to the high potential acquisition module 103, the high potential acquisition module 103 is connected with the low potential receiving module 104, and the current measuring resistor reduces the integral equivalent inductance of the current sensor in a resistor parallel connection mode. The high potential acquisition module and the low potential receiving module are connected in a photoelectric isolation transmission mode through a photoelectric conversion circuit 103-1 and an optical fiber cable.
In the examples: the electric field measuring sensor is a photoelectric integrated sensor, the photoelectric integrated sensor is a photoelectric integrated sensor formed by a photoelectric effect wafer, laser is divided into two parts in the photoelectric effect wafer, due to the action of a space electric field, the two laser paths deviate, the two laser paths are adjusted in a light detector, and a discharge gap space transient electric field waveform is output. The electric field measuring device receives a field intensity waveform signal of the electric field measuring sensor through the optical fiber cable in a photoelectric isolation transmission mode.
A synchronous observation method is introduced by extending the long air gap discharge multi-physical quantity synchronous observation system, a Marx impulse voltage generator achieves discharge ball long air gap discharge breakdown voltage through multi-level ball gap breakdown boosting, the method comprises the steps of determining synchronous starting signals and synchronous observation records of a starting current measuring device, an electric field measuring device and a schlieren observation device, wherein: the determining a synchronization start signal is: acquiring a VHF signal generated at the ball gap breakdown moment of the Marx impulse voltage generator, and triggering a trigger of an oscilloscope by using the VHF signal to send out a synchronous starting signal;
the synchronous observation records of the starting current measuring device, the electric field measuring device and the schlieren observation device are as follows: the synchronous starting signal is used as an initial recording moment to establish an observation coordinate in the field intensity measuring process of the electric field measuring device for the long air gap, then the current measurement observation time of the current measurement device is determined in a delayed mode, an ICCD high-speed camera of the schlieren observation device is synchronously started to photograph the image of the schlieren acquisition device at the current measurement observation time, further completing the synchronous comparison and observation of the current, the electric field and the schlieren optical image in a coordinate system in the long air gap discharge process, and FIG. 4 shows the relationship of synchronous trigger time, the t0 moment when the record of the electric field measurement triggers a is the ball gap breakdown moment b (VHF signal), and the highest point d of the voltage waveform c applied to the long air gap, namely the front rising edge of the breakdown point, so that the whole process of the long air gap discharge breakdown of the acquired signal is ensured. Therefore, the current measurement observation time t1 of the current measurement device can be determined through the delayed control starting, the ICCD high-speed camera of the schlieren observation device is synchronously started to photograph the image of the schlieren acquisition device at the current measurement observation time t1, the delayed time t1 can be determined by the time when the field intensity is at the highest point, and if other points are observed, the front and back adjustment can be carried out according to the highest point time.
Wherein: since the VHF signal comprises a multilevel VHF signal in which discontinuous continuity is generated by multilevel ball break down, the method further comprises the step of adjusting the timing of the emission of the synchronization start signal, including: inputting the total number of ball gap breakdowns (known) of the Marx impulse voltage generator, such as 10 levels, and inputting the number of VHF signals to be acquired, such as 6 levels; and counting each acquired stage, and triggering a trigger of the oscilloscope to send out a synchronous starting signal by using the VHF signal at the moment when the acquired VHF signal is the moment when the input stage (6 stages) appears.
Claims (6)
1. A long air gap discharge multi-physical quantity synchronous observation system comprises a current measuring device, an electric field measuring device and a schlieren observation device, wherein a current measuring resistor of the current measuring device is connected in series between a Marx impulse voltage generator and a discharge ball, an electric field measuring sensor of the electric field measuring device is arranged in a discharge long air gap of the discharge ball, and an ICCD high-speed camera of the schlieren observation device is arranged beside the discharge long air gap through a schlieren acquisition device, and is characterized in that a VHF antenna is arranged beside the Marx impulse voltage generator, the output of the VHF antenna is connected with an oscilloscope, the VHF antenna receives a VHF signal generated by the ball gap boosting breakdown of the Marx impulse voltage generator, the output of the oscilloscope is connected with a multi-channel digital delay trigger, a plurality of trigger channels of the multi-channel digital delay trigger are respectively connected with the current measuring device, the electric field measuring device and the schlieren observation device, the trigger output of the oscilloscope sends out a synchronous signal according to the received VHF signal, and synchronizes the observation records of the current measuring device, the electric field measuring device and the schlieren observation device.
2. The synchronous observation system according to claim 1, wherein the current measuring device, the electric field measuring device and the schlieren observation device are respectively connected to a computer for storing the synchronous observation record signals.
3. The synchronous observation system according to claim 1, wherein the current measuring device is used for measuring the streamer-leader converted current waveform on the high potential electrode in the long air discharge gap, and comprises a high potential collecting module and a low potential receiving module, the current measuring resistor is connected with a coaxial resistor attenuator, the coaxial resistor attenuator is connected with the high potential collecting module through a coaxial cable, the high potential collecting module is connected with the low potential receiving module, and the current measuring resistor is a non-inductive sampling resistor formed by connecting multiple resistors in parallel.
4. The synchronous observation system according to claim 3, wherein the high potential collection module and the low potential receiving module are connected by a photoelectric conversion circuit through an optical fiber cable in a photoelectric isolation transmission manner.
5. The synchronous observation system according to claim 1, wherein the electric field measurement sensor is a photoelectric integrated sensor, and the electric field measurement device receives the field intensity waveform signal of the electric field measurement sensor through a fiber optic cable in a photoelectric isolation transmission manner.
6. The synchronous observation system according to claim 1, wherein the schlieren acquiring device comprises an adjustable extended light source, a main lens, an adjustable knife edge and an imaging objective lens, the main lens is divided into a first lens and a second lens, the first lens and the second lens are respectively arranged on two opposite sides of the long discharge air gap, light emitted by the adjustable extended light source penetrates through the first lens and penetrates through the long discharge air gap to the second lens, the adjustable knife edge and the imaging objective lens are sequentially arranged behind the second lens, the adjustable knife edge is used for adjusting the amount of the light, and the ICCD high-speed camera is arranged behind the imaging objective lens and is used for acquiring schlieren optical images.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113125906A (en) * | 2021-03-31 | 2021-07-16 | 国网安徽省电力有限公司电力科学研究院 | Long air gap discharge multi-physical quantity synchronous observation system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113125906A (en) * | 2021-03-31 | 2021-07-16 | 国网安徽省电力有限公司电力科学研究院 | Long air gap discharge multi-physical quantity synchronous observation system and method |
| CN113125906B (en) * | 2021-03-31 | 2024-08-13 | 国网安徽省电力有限公司电力科学研究院 | System and method for synchronously observing multiple physical quantities of long air gap discharge |
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