CN114373570A - Coaxial high-voltage pulse forming line flexible cable - Google Patents

Coaxial high-voltage pulse forming line flexible cable Download PDF

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CN114373570A
CN114373570A CN202210073684.2A CN202210073684A CN114373570A CN 114373570 A CN114373570 A CN 114373570A CN 202210073684 A CN202210073684 A CN 202210073684A CN 114373570 A CN114373570 A CN 114373570A
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conductor layer
layer
insulating layer
voltage pulse
sleeved outside
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CN114373570B (en
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谌怡
夏连胜
黄子平
张篁
刘毅
李�远
叶茂
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Institute of Fluid Physics of CAEP
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0208—Cables with several layers of insulating material
    • H01B7/0225—Three or more layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract

In order to solve the technical problem that when a traditional flexible coaxial cable is wound and used, due to the electromagnetic coupling effect generated between two coaxial cables in the pulse forming process, the output waveform is distorted or attenuated, the embodiment of the invention provides a coaxial high-voltage pulse forming line flexible cable, which comprises the following components: an inner conductor layer; the inner insulating layer is sleeved outside the inner conductor layer; the middle conductor layer is sleeved outside the inner insulating layer; the middle insulating layer is sleeved outside the middle conductor layer; the outer conductor layer is sleeved outside the middle insulating layer; the outer insulating layer is sleeved outside the outer conductor layer; wherein the outer diameter d of the inner conductor layer1Inner diameter d of the intermediate conductor layer2Outer diameter d of the intermediate conductor layer3Inner diameter d of outer conductor layer4And satisfies the following conditions: d4/d3＝d2/d1. The embodiment of the invention realizes that the output waveform of the pulse generator can not be distorted even if the pulse generator is used in a winding mode in the pulse forming process.

Description

Coaxial high-voltage pulse forming line flexible cable
Technical Field
The invention relates to a coaxial high-voltage pulse forming line flexible cable.
Background
The pulse power technology has important functions in the military fields of Z pinch, particle accelerators, high-power microwaves, high-power lasers and the like, and has advantages in the civil technical fields of biological medical treatment, food sterilization, sewage treatment, material modification and the like. The essence of pulse power is to compress the pulse energy on a time scale to obtain a high peak power output in a very short time. In the field of pulse power, especially in the aspect of ultrafast pulse power technology, it is usually necessary to implement compression of pulse energy by means of an ultrafast high-peak power switch in combination with a pulse forming line, so as to implement square wave high-voltage output with excellent quality. It can be seen that the switch and the pulse forming line are the key to determine the success or failure of the pulse power device.
Common pulse forming lines mainly include a coaxial structure pulse forming line and a flat structure pulse forming line. The flat-plate pulse forming line is usually accompanied by electromagnetic leakage (radiation loss) due to the open electrode structure in the pulse forming process, and is easily interfered by external electromagnetic signals; the electrode structure of the coaxial cable is completely closed, an electromagnetic field is completely closed between the inner conductor and the outer conductor in the pulse forming process, electromagnetic radiation loss does not exist, and interference of external electromagnetic signals does not exist. Therefore, the coaxial pulse forming line has better waveform quality than the flat-plate pulse forming line, and particularly, when the coaxial pulse forming line has requirements on flat-top fluctuation and flat-top change of pulse waveforms, the coaxial pulse forming line is usually adopted to generate required pulse high voltage.
Generally, the pulse forming line of the coaxial structure includes not only a steel cylinder structure pulse forming line using an aqueous medium or an oil medium of several hundred kV to MV order, but also a flexible cable using an insulating medium such as polyethylene of several tens V to several hundreds kV. The flexible coaxial cable can be used for pulse transmission (such as radio frequency signal cable) and also can be used for pulse shaping to generate square wave pulses (such as coaxial cable pulse forming lines). The flexible coaxial cable pulse forming line can be curled and wound, and has the advantages of flexibility, convenience and convenient use compared with the coaxial pulse forming line with a steel cylinder structure. Secondly, the coaxial pulse forming line of the steel cylinder structure has high requirement on the coaxiality of the two core electrodes, high processing and manufacturing cost and high requirement on centering installation technology.
The two types of pulse forming lines of the coaxial structure pulse forming line and the flat structure pulse forming line can be designed by adopting different electric connection modes and loop parameters, so that output of different pulse waveforms is realized, if a single pulse forming line mode is adopted, 1/2 charging voltage amplitude output can be realized on a matched load, and amplitude output such as charging voltage can be realized on the matched load by a Blumlein pulse forming line connection mode. Under the same voltage level, the Blumlein pulse forming line can obtain higher energy output on a matched load relative to a single pulse forming line, and the problem of switch grounding of the single pulse forming line can be avoided. Thus, Blumlein pulse forming lines are relatively more widely used.
Most flexible coaxial cables are generally only provided with two layers of inner and outer conductors, and a few flexible coaxial cables are also arranged in a three-layer conductor coaxial structure when used for signal transmission, wherein the outermost conductor layer is generally used for electromagnetic shielding, and the middle conductor layer and the inner conductor are still used for actually playing a role in signal transmission. When the coaxial cable is used for pulse shaping, the coaxial cable can be designed into a Blumlein pulse forming line structure, but when the coaxial cable is wound for use, the structural layout of the Blumlein line of the double coaxial cables enables a particularly serious electromagnetic coupling effect to occur between the two coaxial cables in the pulse forming process, and further causes distortion or attenuation of actually output waveforms.
Disclosure of Invention
In order to solve the technical problem that when a traditional flexible coaxial cable is used in a winding mode, due to the fact that an electromagnetic coupling effect occurs between two coaxial cables in the pulse forming process, output waveforms are distorted or attenuated, the embodiment of the invention provides a flexible cable of a coaxial high-voltage pulse forming line.
The purpose of the embodiment of the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a coaxial high-voltage pulse forming line flexible cable, including coaxially disposed:
an inner conductor layer;
the inner insulating layer is sleeved outside the inner conductor layer;
the middle conductor layer is sleeved outside the inner insulating layer;
the middle insulating layer is sleeved outside the middle conductor layer;
the outer conductor layer is sleeved outside the middle insulating layer and is used for grounding;
the outer insulating layer is sleeved outside the outer conductor layer;
wherein the outer diameter d of the inner conductor layer1Inner diameter d of the intermediate conductor layer2Outer diameter d of the intermediate conductor layer3Inner diameter d of outer conductor layer4And satisfies the following conditions: d4/d3＝d2/d1。
Further, the inner insulating layer and the middle insulating layer are made of polyethylene, acrylonitrile butadiene or polytetrafluoroethylene; the outer insulating layer is made of polyvinyl chloride or Teflon.
Further, the inner conductor layer is a single copper solid line or a stranded wire formed by winding a plurality of copper wires.
Further, the middle conductor layer and the outer conductor layer are copper sheets; the middle conductor layer is wound outside the inner insulating layer; the outer conductor layer is wound outside the middle insulating layer.
Further, the outer conductor layer and the middle conductor layer are of a woven copper mesh structure; the woven copper mesh structure of the middle conductor layer is sleeved outside the inner insulating layer; the woven copper mesh structure of the outer conductor layer is sleeved outside the middle insulating layer; and semiconductor shimming belts are wound on the inner surface of the outer conductor layer, the inner surface of the middle conductor layer and the outer surface of the middle conductor layer.
Further, the inner conductor layer is a stranded wire formed by winding a plurality of copper wires; the outer surface of the inner conductor layer is wound with a semiconductor shimming band.
Further, the bending radius of the cable is less than 100 mm; the diameter of the inner conductor layer is 2.5-3.5 mm; the diameter of the middle conductor layer is 5-7 mm; the inner diameter of the outer conductor layer is 10-14 mm; the direct current working voltage is 20-40 kV.
Further, the outer diameter d of the middle conductor layer of the cable3And inner diameter d of the intermediate conductor layer2The difference of (a) is 0.03-0.5 mm.
Further, the wave impedance between the outer conductor layer and the middle conductor layer of the cable is 15-30 omega, and the wave impedance between the middle conductor layer and the inner conductor is 15-30 omega.
In a second aspect, an embodiment of the present invention provides a coaxial high-voltage pulse forming line flexible cable, including:
an inner conductor layer;
the inner insulating layer is sleeved outside the inner conductor layer;
the middle conductor layer is sleeved outside the inner insulating layer;
the middle insulating layer is sleeved outside the middle conductor layer;
the outer conductor layer is sleeved outside the middle insulating layer and is used for grounding;
the outer insulating layer is sleeved outside the outer conductor layer;
the coaxial high-voltage pulse forming line flexible cable meets the following requirements:
Figure BDA0003483048140000031
wherein, C0Forming a unit capacitor of a single-layer transmission line of the linear flexible cable for the coaxial high-voltage pulse; c0(inner)The unit capacitor is the inner transmission line; c0(outer)The unit capacitor is an outer transmission line;
L0forming unit inductance of the single-layer transmission line of the linear flexible cable for the coaxial high-voltage pulse; l is0(inner)A unit inductance of the inner transmission line; l is0(outer)The unit inductor is an outer transmission line;
Z0forming the wave impedance of the single-layer transmission line of the linear flexible cable for the coaxial high-voltage pulse; z0(inner)Is the wave impedance of the inner transmission line; z0(outer)The wave impedance of the outer transmission line;
τ0forming an electrical length of the linear flexible cable for the coaxial high voltage pulse; tau is0(inner)Is the electrical length of the inner transmission line; tau is0(outer)The electrical length of the outer transmission line.
Compared with the prior art, the embodiment of the invention has the following advantages and beneficial effects:
the coaxial high-voltage pulse forming line flexible cable provided by the embodiment of the invention has the following advantages that the flexible cable is formed by six layers of structures of an inner conductor layer, an inner insulating layer, a middle conductor layer, a middle insulating layer, an outer conductor layer and an outer insulating layer, and all the conductor layers meet the following requirements: d4/d3＝d2/d1Wherein d is1Is the outer diameter of the inner conductor layer, d2Is the inner diameter of the intermediate conductor layer, d3Outer diameter of the intermediate conductor layer, d4Is the inner diameter of the outer conductor layer; the output waveform of the pulse generator is not distorted even if the pulse generator is used in a winding manner in the pulse forming process; therefore, the defect that the output waveform is distorted or attenuated due to the electromagnetic coupling effect generated between the two coaxial cables in the pulse forming process when the traditional flexible coaxial cable is wound for use is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a coaxial high-voltage pulse forming line flexible cable.
Fig. 2 is a schematic cross-sectional structure diagram of a coaxial high-voltage pulse forming line flexible cable.
FIG. 3 is a schematic circuit connection diagram of a Blumlein pulse forming line structure.
FIG. 4 is a schematic diagram of the circuit pulse output for the Blumlein pulse forming line structure.
Fig. 5 is a circuit diagram of a radial transmission line structure.
FIG. 6 is a schematic diagram of the circuit pulse output for the radial transmission line structure.
Reference numbers and corresponding part names in the drawings:
1-inner conductor layer, 2-inner insulation layer, 3-middle conductor layer, 4-middle insulation layer, 5-outer conductor layer, 6-outer insulation layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Examples
In order to solve the technical problem that when a traditional flexible coaxial cable is used in a winding mode, due to the fact that an electromagnetic coupling effect occurs between two coaxial cables in the pulse forming process, output waveforms are distorted or attenuated, the embodiment of the invention provides a flexible cable of a coaxial high-voltage pulse forming line.
In a first aspect, an embodiment of the present invention provides a coaxial high-voltage pulse forming line flexible cable, which is shown in fig. 1 to 6, and includes coaxially disposed: an inner conductor layer 1; the inner insulating layer 2 is sleeved outside the inner conductor layer; the middle conductor layer 3 is sleeved outside the inner insulating layer; the middle insulating layer 4 is sleeved outside the middle conductor layer; the outer conductor layer 5 is sleeved outside the middle insulating layer and is used for grounding; the outer insulating layer 6 is sleeved outside the outer conductor layer; wherein the outer diameter d of the inner conductor layer1Inner diameter d of the intermediate conductor layer2Outer diameter d of the intermediate conductor layer3Inner diameter d of outer conductor layer4And satisfies the following conditions: d4/d3＝d2/d1。
The specific design principle is as follows:
the common coaxial cable is divided into four layers of an inner conductor, an inner insulating layer, an outer conductor layer and an outer insulating layer, and has extremely high frequency response when used as a signal transmission line. If the outer diameter of the inner conductor is D and the inner diameter of the outer conductor is D, the single-layer unit capacitance and the unit inductance of the coaxial cable are respectively as follows:
Figure BDA0003483048140000051
Figure BDA0003483048140000052
having a wave impedance of
Figure BDA0003483048140000053
Having an electrical length of
Figure BDA0003483048140000054
Wherein, mu0Is a vacuum permeability of epsilon0Is a dielectric constant in vacuum, murIs the relative permeability, epsilon, of the insulating material of the insulating layerrThe relative dielectric constant of the insulating material of the insulating layer, i is the geometric length of the high-voltage pulse forming linear flexible cable, and c is the light speed in vacuum.
The coaxial high-voltage pulse forming line flexible cable provided by the embodiment of the invention mainly comprises a coaxial conductor layer and a coaxial insulating medium layer. The cable is composed of six layers, namely an inner conductor layer, an inner insulating layer, a middle conductor layer, a middle insulating layer, an outer conductor layer and an outer insulating layer. Let the outer diameter of the inner conductor layer be d1The inner diameter of the middle conductor layer is d2The outer diameter of the middle conductor layer is d3The inner diameter of the outer conductor layer is d4. According to the formulas (1) to (4), the unit capacitance and the unit inductance, the wave impedance and the electrical length of the inner layer transmission line of the high-voltage pulse forming line flexible cable are respectively as follows:
Figure BDA0003483048140000061
Figure BDA0003483048140000062
Figure BDA0003483048140000063
Figure BDA0003483048140000064
according to the formulas (1) to (4), the unit capacitance and the unit inductance, the wave impedance and the electrical length of the coaxial high-voltage pulse forming line flexible cable outer layer transmission line are respectively as follows:
Figure BDA0003483048140000065
Figure BDA0003483048140000066
Figure BDA0003483048140000067
Figure BDA0003483048140000068
the inner and outer insulating layers are typically filled with the same insulating medium, and thus the electrical lengths of the inner and outer transmission lines are the same. When three layers of conductors satisfy the relation d4/d3＝d2/d1Then, the coaxial high voltage pulse forming line flexible cable described herein satisfies the following relationship:
C0＝C0(inner)＝C0(outer)
L0＝L0(inner)＝L0(outer)
Z＝Z(inner)＝Z(outer)
τ＝τ(inner)＝τ(outer) (13)
therefore, the embodiment of the invention adopts the six-layer structure of the inner conductor layer, the inner insulating layer, the middle conductor layer, the middle insulating layer, the outer conductor layer and the outer insulating layer, and enables each conductor layer to satisfy the following conditions: d4/d3＝d2/d1(ii) a The output waveform of the pulse generator is not distorted even if the pulse generator is used in a winding manner in the pulse forming process; thereby avoiding the traditional flexible coaxial cable from being wound for useThe electromagnetic coupling effect between the two coaxial cables in the pulse forming process causes the defect of distortion or attenuation of the output waveform.
Optionally, the conductive layers are made of copper, the inner insulating layer and the middle insulating layer are made of polyethylene, and the outer insulating layer is made of polyvinyl chloride.
Further, the inner insulating layer and the middle insulating layer are made of polyethylene, acrylonitrile butadiene or polytetrafluoroethylene; the outer insulating layer is made of polyvinyl chloride or Teflon.
Further, the inner conductor layer is a single copper solid line or a stranded wire formed by winding a plurality of copper wires.
The inner conductor can be a single thick copper solid line or a stranded wire wound by a copper wire with smaller diameter. Compared with a copper stranded wire, the surface of a thick copper solid line is smoother, the wave impedance of the cable is more uniform, and the voltage-resistant grade is higher. However, the solid line of blister copper also stiffens the cable and increases the bend radius.
Further, the middle conductor layer and the outer conductor layer are copper sheets; the middle conductor layer is wound outside the inner insulating layer; the outer conductor layer is wound outside the middle insulating layer.
The middle-layer conductor and the outer-layer conductor are formed by winding copper sheets, so that mutual interference of electromagnetic fields in the two layers of insulating media can be further avoided, the electromagnetic coupling effect is reduced, and excellent pulse output waveform quality is ensured.
Further, the outer conductor layer and the middle conductor layer are of a woven copper mesh structure; the woven copper mesh structure of the middle conductor layer is sleeved outside the inner insulating layer; the woven copper mesh structure of the outer conductor layer is sleeved outside the middle insulating layer; and semiconductor shimming belts are wound on the inner surface of the outer conductor layer, the inner surface of the middle conductor layer and the outer surface of the middle conductor layer.
When the outer conductor and the middle conductor adopt a woven copper mesh structure, in order to avoid the situation that the breakdown of a cable body is induced due to field intensity unevenness caused by the fluctuation of the electrode surface introduced by weaving copper mesh holes in the outer conductor and the middle conductor, the inner surface of the outer conductor, the inner surface of the middle conductor and the outer surface of the middle conductor are wound with semiconductor shimming belts.
Further, the inner conductor layer is a stranded wire formed by winding a plurality of copper wires; the outer surface of the inner conductor layer is wound with a semiconductor shimming band.
When the inner conductor adopts a copper stranded wire structure, in order to avoid the breakdown of the cable body caused by the uneven field intensity caused by the spiral winding fluctuation of the copper stranded wire of the inner conductor, a semiconductor shimming belt is usually wound on the outer surface of the inner conductor.
Further, the bending radius of the cable is less than 100 mm; the outer diameter of the inner conductor layer is 2.5-3.5 mm; the diameter of the middle conductor layer is 5-7 mm; the inner diameter of the outer conductor layer is 10-14 mm; the direct current working voltage is 20-40 kV.
Further, the outer diameter d of the middle conductor layer of the cable3And inner diameter d of the intermediate conductor layer2Approximately equal, typically 0.03-0.5mm difference.
Further, the wave impedance between the outer conductor layer and the middle conductor layer of the cable is 15-30 omega, and the wave impedance between the middle conductor layer and the inner conductor is 15-30 omega.
Since the outer conductor layer is grounded, the output waveform thereof is not distorted even if it is wound for use in the pulse forming process.
The coaxial high-voltage pulse forming line flexible cable of the embodiment of the invention is respectively connected into a Blumlein pulse forming line structure and a radial transmission line structure through circuits, and referring to the drawings of fig. 3-6, high-quality waveform pulse high-voltage output with low flat-top fluctuation and low flat-top variation can be obtained; compared with a ceramic solid pulse forming line with the same voltage level and the like, the manufacturing cost of the pulse forming line can be obviously reduced; the pulse forming line flexible cable is simple in preparation process, can be used for preparing an infinite-length cable in one step theoretically, and meets the requirements of different application occasions on pulse width; meanwhile, because the outer conductor is grounded, the output waveform of the pulse generator can not be distorted even if the pulse generator is wound for use in the pulse forming process; the cable has small bending radius, can be wound and used at will, and occupies small space.
In a second aspect, an embodiment of the present invention provides a coaxial high-voltage pulse forming line flexible cable, including:
an inner conductor layer;
the inner insulating layer is sleeved outside the inner conductor layer;
the middle conductor layer is sleeved outside the inner insulating layer;
the middle insulating layer is sleeved outside the middle conductor layer;
the outer conductor layer is sleeved outside the middle insulating layer and is used for grounding;
the outer insulating layer is sleeved outside the outer conductor layer;
the coaxial high-voltage pulse forming line flexible cable meets the following requirements:
Figure BDA0003483048140000081
wherein, C0Forming a unit capacitor of a single-layer transmission line of the linear flexible cable for the coaxial high-voltage pulse; c0(inner)The unit capacitor is the inner transmission line; c0(outer)The unit capacitor is an outer transmission line;
L0forming unit inductance of the single-layer transmission line of the linear flexible cable for the coaxial high-voltage pulse; l is0(inner)A unit inductance of the inner transmission line; l is0(outer)The unit inductor is an outer transmission line;
Z0forming the wave impedance of the single-layer transmission line of the linear flexible cable for the coaxial high-voltage pulse; z0(inner)Is the wave impedance of the inner transmission line; z0(outer)The wave impedance of the outer transmission line;
τ0forming an electrical length of the linear flexible cable for the coaxial high voltage pulse; tau is0(inner)Is the electrical length of the inner transmission line; tau is0(outer)The electrical length of the outer transmission line.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. The utility model provides a coaxial high voltage pulse forms line flexible cable which characterized in that, including coaxial setting:
an inner conductor layer;
the inner insulating layer is sleeved outside the inner conductor layer;
the middle conductor layer is sleeved outside the inner insulating layer;
the middle insulating layer is sleeved outside the middle conductor layer;
the outer conductor layer is sleeved outside the middle insulating layer and is used for grounding;
the outer insulating layer is sleeved outside the outer conductor layer;
wherein the outer diameter d of the inner conductor layer1Inner diameter d of the intermediate conductor layer2Outer diameter d of the intermediate conductor layer3Inner diameter d of outer conductor layer4And satisfies the following conditions: d4/d3＝d2/d1。
2. The coaxial high-voltage pulse forming line flexible cable according to claim 1, wherein the inner insulating layer and the middle insulating layer are made of polyethylene, acrylonitrile butadiene or polytetrafluoroethylene; the outer insulating layer is made of polyvinyl chloride or Teflon.
3. The coaxial high-voltage pulse forming line flexible cable according to claim 1, wherein the inner conductor layer is a single copper solid line or a stranded wire wound by a plurality of copper wires.
4. The coaxial high-voltage pulse forming line flexible cable according to claim 1, wherein the intermediate conductor layer and the outer conductor layer are copper sheets; the middle conductor layer is wound outside the inner insulating layer; the outer conductor layer is wound outside the middle insulating layer.
5. The coaxial high-voltage pulse forming line flexible cable according to claim 1, wherein the outer conductor layer and the middle conductor layer are of a braided copper mesh structure; the woven copper mesh structure of the middle conductor layer is sleeved outside the inner insulating layer; the woven copper mesh structure of the outer conductor layer is sleeved outside the middle insulating layer; and semiconductor shimming belts are wound on the inner surface of the outer conductor layer, the inner surface of the middle conductor layer and the outer surface of the middle conductor layer.
6. The coaxial high-voltage pulse forming line flexible cable according to claim 1, wherein the inner conductor layer is a stranded wire wound by a plurality of copper wires; the outer surface of the inner conductor layer is wound with a semiconductor shimming band.
7. The coaxial high-voltage pulse forming line flexible cable according to claim 1, wherein the bending radius of the cable is less than 100 mm; the diameter of the inner conductor layer is 2.5-3.5 mm; the diameter of the middle conductor layer is 5-7 mm; the inner diameter of the outer conductor layer is 10-14 mm; the direct current working voltage is 20-40 kV.
8. The coaxial high-voltage pulse forming line flex cable according to claim 1, wherein the outer diameter d of the middle conductor layer of the cable3And inner diameter d of the intermediate conductor layer2The difference of (a) is 0.03-0.5 mm.
9. The coaxial high-voltage pulse forming wire flexible cable according to claim 1, wherein the wave impedance between the outer conductor layer and the middle conductor layer of the cable is 15-30 Ω, and the wave impedance between the middle conductor layer and the inner conductor is 15-30 Ω.
10. A coaxial high voltage pulse forming line flex cable, comprising:
an inner conductor layer;
the inner insulating layer is sleeved outside the inner conductor layer;
the middle conductor layer is sleeved outside the inner insulating layer;
the middle insulating layer is sleeved outside the middle conductor layer;
the outer conductor layer is sleeved outside the middle insulating layer and is used for grounding;
the outer insulating layer is sleeved outside the outer conductor layer;
the coaxial high-voltage pulse forming line flexible cable meets the following requirements:
Figure FDA0003483048130000021
wherein, C0Forming a unit capacitor of a single-layer transmission line of the linear flexible cable for the coaxial high-voltage pulse; c0(inner)The unit capacitor is the inner transmission line; c0(outer)The unit capacitor is an outer transmission line;
L0forming unit inductance of the single-layer transmission line of the linear flexible cable for the coaxial high-voltage pulse; l is0(inner)A unit inductance of the inner transmission line; l is0(outer)The unit inductor is an outer transmission line;
Z0forming the wave impedance of the single-layer transmission line of the linear flexible cable for the coaxial high-voltage pulse; z0(inner)Is the wave impedance of the inner transmission line; z0(outer)The wave impedance of the outer transmission line;
τ0forming an electrical length of the linear flexible cable for the coaxial high voltage pulse; tau is0(inner)Is the electrical length of the inner transmission line; tau is0(outer)The electrical length of the outer transmission line.
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Citations (6)

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