CN207232234U - A kind of special fast transient overvoltage measuring system - Google Patents

Abstract

The application provides an ultra-fast transient overvoltage measurement system, including: a cone capacitive sensor, an integrator, an acquisition device, and an industrial computer; wherein, the cone capacitive sensor is provided with a first cone and a second cone; the first The cone is arranged coaxially inside the second cone, and a dielectric film is filled between the first cone and the second cone; the second cone is provided with a cone bottom. When in use, the bottom surface of the second cone and the conductor in the GIS pipeline, as well as the filling gas between the bottom surface of the cone and the conductor form a high-voltage arm capacitor; the first cone, the second cone and the dielectric film form a low-voltage capacitor arm Capacitance, the low-voltage arm capacitance of the cone structure is larger than the low-voltage arm capacitance of the flat capacitive sensor under the same sensing area, so that the cone capacitive sensor has a larger voltage division ratio and wider frequency band; the low-voltage arm capacitance has a cone structure, It avoids waveform oscillation and distortion caused by refraction and reflection of the voltage wave in the cone capacitive sensor, thereby realizing accurate measurement of VFTO.

Description

A Very Fast Transient Overvoltage Measurement System

technical field

The present application relates to the technical field of power electronics, in particular to an ultra-fast transient overvoltage measurement system.

Background technique

Gas Insulated Switchgear (GIS for short), because the equipment is sealed and filled with insulating gas, has strong arc extinguishing ability and small footprint, it is widely used in EHV and UHV switchgear and busbar equipment. When the isolating switch, grounding switch and circuit breaker in GIS equipment are operating, they will generate Very Fast Transient Overvoltage (VFTO for short). Due to the high amplitude, high frequency and large steepness of VFTO , will pose a serious threat to the safe operation of the equipment. Therefore, the accurate measurement of VFTO can provide a reference for the safe operation of GIS equipment.

However, the rise time of VFTO is very short, usually only a few nanoseconds, and VFTO is superimposed on the power frequency voltage, and is affected by the residual charge voltage whose equivalent frequency is close to direct current. In addition, when GIS equipment generates VFTO, it also It will be accompanied by high transient earth voltage (TEV for short) and strong space electromagnetic interference. Therefore, in order to realize the accurate measurement of VFTO by VFTO measurement equipment, the response time of VFTO measurement equipment is required to be very short. Short, wide frequency band, and has the ability to resist electromagnetic interference in space.

In the prior art, the planar capacitive sensor with planar electrode structure is mainly used to measure VFTO. However, the low-voltage arm capacitance of the planar capacitive sensor used in the prior art VFTO measurement is small, and the voltage division ratio is small, so it cannot achieve a wide frequency band response. , resulting in smaller RC time constant in the measurement circuit, poorer low-frequency response, and narrower frequency band; in addition, the impedance of the flat electrode structure is difficult to match with the impedance of the measurement cable, which will generate catadioptric voltage, and the catadioptric voltage waveform is superimposed on the On the measured voltage waveform, it causes waveform oscillation and distortion. Therefore, the flat capacitive sensor used in measuring VFTO in the prior art cannot realize accurate measurement of VFTO.

Utility model content

The present application provides an ultra-fast transient overvoltage measurement system to solve the problems existing in the prior art.

According to an embodiment of the application, a kind of ultra-fast transient overvoltage measurement system is provided, including: a cone capacitive sensor, an integrator, an acquisition device and an industrial computer; wherein:

The cone capacitive sensor is provided with a first cone and a second cone; the first cone is coaxially arranged inside the second cone, and the distance between the first cone and the second cone is The gap is filled with a dielectric film; the second cone is provided with a cone bottom.

The integrator includes a housing and a resistance-capacity integrating circuit arranged in the housing, the housing is provided with an input end and an output end; the top of the second cone is provided with a cable joint, and the second The cone is coaxially connected to the input end of the integrator through the cable joint; the output end of the integrator is connected to one end of the acquisition device; the other end of the acquisition device is connected to the industrial control machine connection.

Optionally, an electro-optical conversion device and a photoelectric conversion device are further arranged between the collection device and the industrial computer, the collection device is electrically connected to the electro-optic conversion device, and the industrial computer is electrically connected to the photoelectric conversion device. The electrical-optical conversion device and the photoelectric conversion device are remotely connected through an optical fiber.

Optionally, the first cone includes a cone angle α, and the range of the cone angle α is between 15 degrees and 45 degrees.

Optionally, the housing of the integrator is a cylindrical hollow housing.

Optionally, the acquisition device is an analog acquisition card or an oscilloscope.

Optionally, a shielding cover is arranged outside the collection device.

Optionally, the cable joint is a rubber joint made of metal.

Optionally, the resistance value of the resistance-capacity integration circuit ranges from 20Ω to 80Ω, and the capacitance value range of the resistance-capacity integration circuit ranges from 50pF to 2nF.

Optionally, the first cone and the second cone are made of metal aluminum.

Optionally, the casing of the integrator is made of metal.

It can be known from the above technical solutions that the present application provides an ultra-fast transient overvoltage measurement system, including: a cone capacitance sensor, an integrator, an acquisition device and an industrial computer; wherein the cone capacitance sensor is provided with a first cone and a second cone. Two cones; the first cone is coaxially arranged inside the second cone, and a dielectric film is filled between the first cone and the second cone; the second cone is provided with a cone bottom; the integrator includes a housing and The resistance-capacity integration circuit is set in the housing, and the housing is provided with an input terminal and an output terminal; the top of the second cone is provided with a cable connector, and the second cone is connected to the input terminal of the integrator through the cable connector; the integrator The output end is connected with one end of the acquisition device; the other end of the acquisition device is connected with the industrial computer. When the ultra-fast transient overvoltage measurement system provided by this application is used, it is set in the reserved window of the GIS pipeline and fixed on the grounded shell of the reserved window; the bottom surface of the second cone and the conductor in the GIS pipeline, And the filling gas between the bottom surface of the cone and the conductor forms the high-voltage arm capacitance; the first cone, the second cone and the dielectric film form the low-voltage arm capacitance, and the low-voltage arm capacitance in the cone structure is larger than that of the plate under the same sensing area The low-voltage arm capacitance of the capacitive sensor makes the cone capacitive sensor in this application have a larger voltage division ratio and wider frequency band; in addition, in this application, because the low-voltage arm capacitance is a cone structure, the cone capacitive sensor is in the The size gradient is formed in the propagation direction of the voltage wave, and it is connected with the integrator in a smooth transition, which realizes the smooth transition from the wave impedance of the cone to the wave impedance of the integrator, matches the internal voltage of the system, and avoids the voltage wave from being folded in the cone capacitive sensor Waveform oscillation and distortion caused by reflection, so as to realize accurate measurement of VFTO.

Description of drawings

In order to illustrate the technical solution of the present application more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, on the premise of not paying creative labor, Additional drawings can also be derived from these drawings.

Fig. 1 is a schematic structural diagram of a very fast transient overvoltage measurement system shown in an embodiment of the present application;

Fig. 2 is a structural schematic diagram of a cone capacitive sensor of an ultra-fast transient overvoltage measurement system shown in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of an integrator of an ultra-fast transient overvoltage measurement system shown in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of another ultra-fast transient overvoltage measurement system shown in the embodiment of the present application;

FIG. 5 is a schematic diagram of a lightning impulse voltage waveform measured by an ultra-fast transient overvoltage measurement system of the present application;

FIG. 6 is a schematic diagram of a voltage waveform with a rising edge lower than 10 ns measured by an ultra-fast transient overvoltage measurement system of the present application.

Among them: 1-cone capacitive sensor, 11-first cone, 12-second cone, 121-cone bottom, 122-cable connector, 13-dielectric film, 2-integrator, 21-housing, 211 -input terminal, 212-output terminal, 22-resistance-capacity integration circuit, 3-acquisition device, 31-shielding cover, 4-industrial computer, 5-electro-optical conversion device, 6-photoelectric conversion device, 7-grounding shell, 8- GIS pipeline, 9-conductor.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

Embodiment one

An embodiment of the present application provides an ultra-fast transient overvoltage measurement system, and FIG. 1 is a schematic structural diagram of an ultra-fast transient overvoltage measurement system shown in an embodiment of the present application. As shown in Figure 1, an ultra-fast transient overvoltage measurement system provided in the embodiment of the present application includes: a cone capacitive sensor 1, an integrator 2, an acquisition device 3, and an industrial computer 4, wherein:

Referring to FIG. 2 , it is a schematic structural diagram of a cone capacitive sensor of an ultra-fast transient overvoltage measurement system shown in an embodiment of the present application. As shown in Figure 2, the cone capacitive sensor 1 is provided with a first cone 11 and a second cone 12; the first cone 11 is coaxially arranged inside the second cone 12, and the first cone 11 and the second cone A dielectric film 13 is filled between the bodies 12 ; a bottom surface 121 of the second cone body 12 is provided at the bottom of the cone body 12 . In the present application, the first cone 11 and the second cone 12 are coaxially arranged, the first cone 11 and the second cone 12 have the same taper angle α, and the structural size of the second cone 12 is slightly smaller than The structural size of the first cone 11 is such that an equidistant gap is formed between the first cone 11 and the second cone 12 .

In this application, the gap between the first cone 11 and the second cone 12 is filled with a dielectric film 13, and the dielectric film 13 is made of a dielectric material, which can realize a layer between the first cone 11 and the second cone 12. insulation between them, and can be used as a buffer layer to avoid collision between the first cone 11 and the second cone 12 . In the present application, the second cone 12 and the bottom surface 121 of the cone form a cone cavity, and the cavity of the cone is filled with insulating gas to prevent arcing. In this embodiment, the dielectric film 13 may be polyimide, polyethylene or polytetrafluoroethylene, or other common dielectric materials. The insulating gas can use clean air, nitrogen, sulfur hexafluoride gas or other gases that can achieve insulation and arc protection. Therefore, this embodiment does not specifically limit the specific material of the dielectric film 13 and the specific form of achieving interlayer insulation between the first pyramid 11 and the second pyramid 12 .

In this application, the cone capacitive sensor 1 is set in the reserved window of the GIS pipeline 8 and fixed on the grounded casing 7 of the reserved window to realize the measurement of the VFTO of the GIS equipment.

Referring to FIG. 3 , it is a schematic structural diagram of an integrator of an ultra-fast transient overvoltage measurement system shown in an embodiment of the present application. As shown in Figure 3, the integrator 2 includes a housing 21 and a resistance-capacity integration circuit 22 arranged in the housing 21, the housing 21 is provided with an input terminal 211 and an output terminal 212; the top of the second cone 12 is provided with Cable connector 122, the second cone 12 is connected to the input end 211 of the integrator 2 through the cable connector 122; the output end 212 of the integrator 2 is connected to one end of the collection device 3; the other end of the collection device 3 is connected to the industrial computer 4.

In this application, the resistance-capacity integration circuit 22 in the integrator 2 can compensate the low-frequency response of the cone capacitive sensor 1 , and has the functions of low-pass filtering and suppressing high-frequency response, thereby improving the low-frequency characteristics of the cone capacitive sensor 1 . The resistance-capacity integration circuit 22 in the present application can also be replaced by other forms of integration circuits, as long as it can realize low-pass filtering and suppress the effect of high-frequency response, thereby improving the low-frequency characteristics of the cone capacitive sensor 1. The integration circuit can be used as The integration circuit in the integrator 2 in this application, therefore, for the specific model of the integrator 2 used in this application, and the specific form of the integration circuit inside the integrator 2, there is no specific limitation in this embodiment, and those skilled in the art You can choose according to factors such as use cost.

In an optional embodiment, the housing 21 of the integrator 2 is a cylindrical hollow housing, and the material of the housing 21 can be selected from metal materials. The metal material used in the cylindrical hollow shell can be used as the electromagnetic shielding layer of the resistance-capacity integration circuit 22 for shielding external electromagnetic interference. At the same time, the metal material can ensure that the potentials on both sides of the integrator 2 are consistent. The size of the housing 21 of the integrator 2 should be such that the wave impedance formed between the RC integration circuit 22 of the integrator 2 and the housing 21 is equal to the wave impedance of the cable joint 122, and the wave impedance of the integrator 2 can be passed through the coaxial The structural wave impedance is calculated by the calculation formula, and will not be described in detail in this embodiment.

In an optional embodiment, the cable connector 122 is a banana connector made of metal material used in coaxial cables, and the input end of the integrator 2 is coaxially connected with the banana connector through a coaxial cable, and the coaxial cable has a good The anti-interference characteristics can shield electromagnetic interference and improve the accuracy of system measurement. In addition, the present application can also use other joints that can ensure the coaxial connection between the second cone 12 and the integrator 2 or other connection methods that can realize a coaxial connection. For more forms of coaxial connection methods, this embodiment does not Let me repeat.

When the cone capacitance sensor 1 of the present application is installed on the GIS pipeline 8, the cone bottom surface 121 is used as a part of the high voltage arm of the capacitance sensor, and the conductor 9 inside the GIS pipeline 8, and the gas is filled between the cone bottom surface 121 and the conductor 9 Constitute the capacitance of the high-voltage arm; the second cone 12 is a part of the low-voltage arm of the capacitive sensor, and forms the capacitance of the low-voltage arm with the first cone 11 and the dielectric film 13 . In the present application, because the second cone 12 has a conical surface, and the cone bottom 121 is a plane, therefore, compared with the area of the cone bottom 121, the area of the second cone 12 will be greater than that of the cone bottom 121 Area, the capacitance of the low-voltage arm formed by the second cone 12, the first cone 11 and the dielectric film 13 is greater than the capacitance of the low-voltage arm of the flat plate capacitive sensor under the same sensing area, which makes the cone capacitive sensor 1 of the present application have a larger distribution. voltage ratio and wider frequency band, in addition, in this application, because the low-voltage arm capacitor is a cone structure, the cone capacitive sensor 1 forms a gradual change in size in the direction of voltage wave propagation, and is connected with the integrator 2 for a smooth transition, realizing the cone The smooth transition from the bulk wave impedance to the integrator wave impedance makes the internal voltage of the system match, and avoids waveform oscillation and distortion caused by refraction and reflection of the voltage wave in the cone capacitive sensor 1 .

In this application, the diameter of the cone bottom 121 as a part of the high-voltage arm of the capacitive sensor is related to the frequency of the measured overvoltage. Specifically, when the electromagnetic wave generated by the VFTO propagates along the axial direction of the GIS pipeline 8, the difference in the cross-section of the GIS pipeline The induced potentials generated at the same time are not equal. Therefore, to measure an accurate voltage waveform, the axial size of the sensing electrode of the capacitive sensor is required, that is, the diameter of the cone bottom 121 in this application is much smaller than the measured waveform In order to avoid the influence of the unequal induction potential and the excessive structure of the induction electrode on the measurement of the overvoltage waveform. For example, the axial dimension of the sensing electrode, that is, the diameter of the cone bottom 121 in this application can be calculated according to the following formula:

Among them, d—allowable electrode diameter;

c0—speed of light;

fmax—the highest frequency of the measured waveform;

ΔV/V—the relative potential difference allowed on the electrode surface.

Generally, ΔV/V=0.01 is selected, and if fmax=100MHz, it can be calculated that d=191mm, that is, the maximum diameter of the cone bottom 121 is preferably 191mm.

In this application, the size of the taper angle α is related to the size of the reserved window of the GIS pipeline 8. Since the preferred maximum diameter of the cone bottom surface 121 can be determined, the change of the taper angle α determines the height of the cone capacitive sensor 1 and the size of the cone lumen. However, the value of the cone angle α cannot be too large or too small. When the cone angle α is too large, the pressure division ratio of the cone capacitive sensor 1 will become smaller. When the cone angle α is too small, the cone The height of the bulk capacitance sensor 1 is too high to be installed in the reserved window of the GIS pipeline 8 , therefore, in this embodiment, the preferred taper angle α is 15°-45°.

In this application, the first cone 11 and the second cone 12 present a cone structure with gradually reduced size in the direction away from the bottom surface 121 of the cone, and the input of the size and integrator 2 is realized at the top of the second cone 12 end 211 dimensions to match. In the present application, the top of the second cone 12 is provided with a cable joint 122, and the cable joint 122 is connected to the input end 211 of the integrator 2, and the integrator is used to improve the high and low frequency response characteristics of the cone capacitive sensor 1. In this embodiment, The preferred resistance range of the resistance-capacity integration circuit 22 is 20Ω-80Ω, and the capacitance range is 50pF-2nF. If the value is outside the preferred resistance and capacitance ranges, the waveform measurement effect will be deteriorated.

In an optional embodiment, the first cone 11 and the second cone 12 are made of metal aluminum to achieve excellent electrical conductivity and reduce the wave impedance of the first cone 11 and the second cone 12 .

In the present application, the output terminal 212 of the integrator 2 is connected to one end of the acquisition device 3. The acquisition device 3 in the present application selects a sampling rate and a frequency bandwidth according to the measured voltage signal. By sampling the measured voltage signal, the voltage signal converted into a digital signal, and the other end of the acquisition device is connected to the industrial computer 4, thereby realizing that the digital signal converted by the acquisition device is transmitted to the industrial computer 4, and the industrial computer 4 displays the measured digital signal according to the sampling of the acquisition device 3 The voltage waveform, and calculate the actual waveform of the ultra-fast transient overvoltage through the voltage division ratio. In addition, the industrial computer 4 can also regulate the sampling rate and frequency band of the acquisition device 3, so that the acquisition device can adapt to different measurement environments. In this application, the industrial computer can be an industrial control computer with input and output devices, display devices, and external interfaces. For the specific model of the industrial control computer, those skilled in the art can determine by themselves according to factors such as cost and scale of use. In this embodiment is not specifically limited.

In an optional embodiment, the acquisition device 3 of the present application is an acquisition card, and the acquisition card can sample the voltage signal output by the integrator 2 according to the preset sampling frequency and sampling bandwidth, and the voltage signal obtained by sampling Converted into digital signal and output. At the same time, in order to realize that the acquisition card can adapt to various extreme test situations, the acquisition card can be powered by batteries or solar energy, so as not to rely on external power supply.

In another alternative embodiment, the acquisition device 3 of the present application can also use an oscilloscope. Since the oscilloscope also has the functions of data sampling and A/D conversion, it can also realize sampling the voltage signal output by the integrator 2. , and convert the voltage signal obtained by sampling into a digital signal and output it.

In an optional implementation manner, a shielding cover 31 is arranged outside the collection device 3 . In this application, since the acquisition device 3 is used to sample the voltage signal output by the integrator 2, and convert the sampled voltage signal into a digital signal and output it, the sampling accuracy of the acquisition device 3 affects the accuracy of the measurement. Therefore, in order to prevent the collection device 3 from being subjected to external electromagnetic interference, a shielding cover 31 is provided outside the collection device 3 in this embodiment.

It can be known from the above technical solutions that the present application provides an ultra-fast transient overvoltage measurement system, including: a cone capacitance sensor, an integrator, an acquisition device and an industrial computer; wherein the cone capacitance sensor is provided with a first cone and a second cone. Two cones; the first cone is coaxially arranged inside the second cone, and a dielectric film is filled between the first cone and the second cone; the second cone is provided with a cone bottom; the integrator includes a housing and The resistance-capacity integration circuit is set in the housing, and the housing is provided with an input terminal and an output terminal; the top of the second cone is provided with a cable connector, and the second cone is connected to the input terminal of the integrator through the cable connector; the integrator The output end is connected with one end of the acquisition device; the other end of the acquisition device is connected with the industrial computer. When the ultra-fast transient overvoltage measurement system provided by this application is used, it is set in the reserved window of the GIS pipeline and fixed on the grounded shell of the reserved window; the bottom surface of the second cone and the conductor in the GIS pipeline, And the filling gas between the bottom surface of the cone and the conductor forms the high-voltage arm capacitance; the first cone, the second cone and the dielectric film form the low-voltage arm capacitance, and the low-voltage arm capacitance in the cone structure is larger than that of the plate under the same sensing area The low-voltage arm capacitance of the capacitive sensor makes the cone capacitive sensor in this application have a larger voltage division ratio and wider frequency band; in addition, in this application, because the low-voltage arm capacitance is a cone structure, the cone capacitive sensor is in the The size gradient is formed in the propagation direction of the voltage wave, and it is connected with the integrator in a smooth transition, which realizes the smooth transition from the wave impedance of the cone to the wave impedance of the integrator, matches the internal voltage of the system, and avoids the voltage wave from being folded in the cone capacitive sensor Waveform oscillation and distortion caused by reflection, so as to realize accurate measurement of VFTO.

Embodiment two

FIG. 4 is a schematic structural diagram of another ultra-fast transient overvoltage measurement system shown in Embodiment 2 of the present application. As shown in Figure 4, the difference between this embodiment and Embodiment 1 is:

An electro-optical conversion device 5 and a photoelectric conversion device 6 are also arranged between the collection device 3 and the industrial computer 4, the collection device 3 is electrically connected to the electro-optical conversion device 5, the industrial computer 4 is electrically connected to the photoelectric conversion device 6, and the electro-optic conversion device 5 and the photoelectric conversion device 6 are electrically connected to each other. The conversion device 6 is remotely connected through an optical fiber.

The electro-optical conversion device 5 in this embodiment can convert the digital signal output by the acquisition device 3 into an optical signal. The optical signal is transmitted to the photoelectric conversion device 6 through an optical fiber, and the photoelectric conversion device 6 can convert the optical signal into an electrical signal and input it to the industrial computer 4 . Because GIS equipment is usually erected over a long distance, the fast transient overvoltage measurement point on the GIS pipeline 8 and the control center or monitoring station where the industrial computer 4 is located are often separated by a long distance. For distance measurement, in this embodiment, by connecting the electro-optical conversion device 5 on the output side of the acquisition device 3, the measurement signal is converted from an electrical signal to an optical signal, and the long-distance transmission of the measurement signal is realized by utilizing the characteristics of low-loss long-distance transmission. And a photoelectric conversion device 6 is installed at the receiving end of the measurement signal to restore the optical signal to an electrical signal and input it to the industrial computer. The industrial computer 4 displays the measured voltage waveform according to the digital signal sampled by the acquisition device 3, and passes the voltage division ratio The actual waveform of the very fast transient overvoltage is calculated. In addition, the industrial computer 4 can also reversely input the control signal through the photoelectric conversion device 6, convert the control signal into an optical signal, and transmit it to the electro-optical conversion device 5 over a long distance, and the electro-optical conversion device 5 restores the optical signal to a control signal to realize the control signal. Remote control of the sampling rate and frequency band of the acquisition device 3 .

The electro-optical conversion device 5 and the photoelectric conversion device 6 in the present application can use optical fiber transceivers in the prior art, and can also use other equipment that can realize electrical-optical conversion and optical-electrical conversion. For the electro-optical conversion device 5 and the photoelectric conversion device The specific form of 6 is not specifically limited in this embodiment.

In the embodiment of the present application, the remote measurement of the GIS equipment VFTO is realized by installing the electro-optical conversion device 5 and the photoelectric conversion device 6 between the acquisition device 3 and the industrial computer 4, and if one or Multiple industrial computers, connected to multiple measurement points, can realize centralized measurement of multiple measurement points in one control center or monitoring station, which greatly improves the measurement efficiency.

Fig. 5 is a schematic diagram of the lightning impulse voltage waveform measured by an ultra-fast transient overvoltage measurement system of the present application, wherein A is the original voltage waveform, and B is the waveform measured by the distributed coaxial cone sensor. It can be seen from Figure 5 that the ultra-fast transient overvoltage measurement system has good reducibility to the long wave tail waveform, that is, the low frequency response is good.

Fig. 6 is a schematic diagram of a voltage waveform with a rising edge lower than 10 ns measured by an ultra-fast transient overvoltage measurement system of the present application, where A is the original voltage waveform, and B is the waveform measured by the distributed coaxial cone sensor. It can be seen from Figure 6 that the ultra-fast transient overvoltage measurement system can perfectly restore the high-frequency voltage waveform whose rising edge is lower than 10ns, that is, the high-frequency response is good. This shows that the measurement system can completely restore the high-frequency components and low-frequency components of the VFTO waveform.

It can be known from the above technical solutions that the present application provides an ultra-fast transient overvoltage measurement system, including: a cone capacitance sensor, an integrator, an acquisition device and an industrial computer; wherein the cone capacitance sensor is provided with a first cone and a second cone. Two cones; the first cone is coaxially arranged inside the second cone, and a dielectric film is filled between the first cone and the second cone; the second cone is provided with a cone bottom; the integrator includes a housing and The resistance-capacity integration circuit is set in the housing, and the housing is provided with an input terminal and an output terminal; the top of the second cone is provided with a cable connector, and the second cone is connected to the input terminal of the integrator through the cable connector; the integrator The output end is connected with one end of the acquisition device; the other end of the acquisition device is connected with the industrial computer. When the ultra-fast transient overvoltage measurement system provided by this application is used, it is set in the reserved window of the GIS pipeline and fixed on the grounded shell of the reserved window; the bottom surface of the second cone and the conductor in the GIS pipeline, And the filling gas between the bottom surface of the cone and the conductor forms the high-voltage arm capacitance; the first cone, the second cone and the dielectric film form the low-voltage arm capacitance, and the low-voltage arm capacitance in the cone structure is larger than that of the plate under the same sensing area The low-voltage arm capacitance of the capacitive sensor makes the cone capacitive sensor in this application have a larger voltage division ratio and wider frequency band; in addition, in this application, because the low-voltage arm capacitance is a cone structure, the cone capacitive sensor is in the The size gradient is formed in the propagation direction of the voltage wave, and it is connected with the integrator in a smooth transition, which realizes the smooth transition from the wave impedance of the cone to the wave impedance of the integrator, matches the internal voltage of the system, and avoids the voltage wave from being folded in the cone capacitive sensor Waveform oscillation and distortion caused by reflection, so as to realize accurate measurement of VFTO.

It should be noted that in this article, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these No such actual relationship or order exists between entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device.

Other embodiments of the present application will be readily apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any modification, use or adaptation of the application, these modifications, uses or adaptations follow the general principles of the application and include common knowledge or conventional technical means in the technical field not disclosed in the application . The specification and examples are to be considered exemplary only, with a true scope and spirit of the application indicated by the following claims.

It should be understood that the present application is not limited to the precise constructions which have been described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. A kind of ultra-fast transient overvoltage measuring system is characterized in that, comprises: cone capacitive sensor (1), integrator (2), acquisition device (3) and industrial computer (4); The cone capacitive sensor (1) is provided with a first cone (11) and a second cone (12); the first cone (11) is coaxially arranged inside the second cone (12) , a dielectric film (13) is filled between the first cone (11) and the second cone (12); the bottom of the second cone (12) is provided with a cone bottom (121); The integrator (2) includes a casing (21) and a resistance-capacity integration circuit (22) arranged in the casing (21), and the casing (21) is provided with an input terminal (211) and an output end (212); the top of the second cone (12) is provided with a cable joint (122), and the second cone (12) is connected to the integrator (2) through the cable joint (122) The input end (211) is coaxially connected; the output end (212) of the integrator (2) is connected to one end of the collection device (3); the other end of the collection device (3) is connected to the collection device (3). The industrial computer (4) is connected. 2. The ultra-fast transient overvoltage measurement system according to claim 1, characterized in that, an electro-optical conversion device (5) and a photoelectric conversion device are also arranged between the acquisition device (3) and the industrial computer (4) device (6), the acquisition device (3) is electrically connected to the electro-optic conversion device (5), the industrial computer (4) is electrically connected to the photoelectric conversion device (6), and the electro-optic conversion device (5 ) and the photoelectric conversion device (6) are remotely connected through optical fibers. 3. The ultra-fast transient overvoltage measurement system according to claim 1, characterized in that, the first cone (11) includes a cone angle α, and the range of the cone angle α is 15°-45° between. 4. The ultra-fast transient overvoltage measurement system according to claim 1, characterized in that, the housing (21) of the integrator (2) is a cylindrical hollow housing. 5. The ultra-fast transient overvoltage measurement system according to claim 1, characterized in that, the acquisition device (3) is an analog acquisition card or an oscilloscope. 6. The ultra-fast transient overvoltage measurement system according to claim 5, characterized in that a shielding cover (31) is arranged outside the acquisition device (3). 7. The ultra-fast transient overvoltage measurement system according to claim 1, characterized in that, the cable joint (122) is a banana joint made of metal. 8. The ultra-fast transient overvoltage measurement system according to claim 1, characterized in that, the resistance range of the resistance-capacity integration circuit (22) is 20Ω～80Ω, and the resistance-capacity integration circuit (22) Capacitor capacitance ranges from 50pF to 2nF. 9. The ultra-fast transient overvoltage measurement system according to claim 1, characterized in that, the first cone (11) and the second cone (12) are made of metal aluminum. 10. The ultra-fast transient overvoltage measurement system according to claim 1, characterized in that, the casing (21) of the integrator (2) is made of metal.