WO2019029638A1 - 一种电容式高压电缆接头局部放电内置传感器结构 - Google Patents

一种电容式高压电缆接头局部放电内置传感器结构 Download PDF

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Publication number
WO2019029638A1
WO2019029638A1 PCT/CN2018/099698 CN2018099698W WO2019029638A1 WO 2019029638 A1 WO2019029638 A1 WO 2019029638A1 CN 2018099698 W CN2018099698 W CN 2018099698W WO 2019029638 A1 WO2019029638 A1 WO 2019029638A1
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Prior art keywords
sensor
screw hole
voltage cable
housing
partial discharge
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PCT/CN2018/099698
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English (en)
French (fr)
Inventor
席菲菲
李高峰
夏荣
周峰
任志刚
刘弘景
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State Grid Beijing Electric Power Co Ltd
Shandong Electrical Engineering and Equipment Group Co Ltd
Chongqing Taishan Cable Co Ltd
State Grid Corp of China SGCC
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State Grid Beijing Electric Power Co Ltd
Shandong Electrical Engineering and Equipment Group Co Ltd
Chongqing Taishan Cable Co Ltd
State Grid Corp of China SGCC
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Publication of WO2019029638A1 publication Critical patent/WO2019029638A1/zh
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements

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  • the invention relates to the field of partial discharge detecting instruments for electrical equipment, in particular to a built-in sensor structure for partial discharge of a capacitive high-voltage cable joint.
  • partial discharge monitoring has been a non-destructive project to test cable insulation.
  • the partial discharge monitoring is used to judge the aging degree of the cable.
  • the cable intermediate joint is a high-incidence part of the insulation accident. It can be seen that the cable accessory has become a weak link of the high-voltage cable line insulation and a typical part of the operation failure.
  • the electrical insulation performance of the cable accessory itself, as well as the quality of the cable and the impact of the cable laying, installation process, environmental impact, etc., can cause cable operation failure. In the event of a failure, it will cause a certain economic loss.
  • partial discharge monitoring is mainly performed by sensing devices such as capacitive sensors, inductive sensors, and antenna sensors, but there are certain problems, and the detection accuracy is not high.
  • the external sensor cannot be used for online monitoring for a long time because it is interfered by external electromagnetic signals, has low detection sensitivity and poor anti-interference ability.
  • the technical problem to be solved by the present invention is to provide a capacitive high-voltage cable joint partial discharge built-in sensor structure.
  • the present invention provides a capacitive high voltage cable joint partial discharge built-in sensor structure, including a sensor and a high voltage cable;
  • the sensor has a cylindrical shape, and is disposed in order from the inside to the outside: a dielectric film, a copper foil electrode, a buffer layer, and a metal casing, and the copper foil electrode is closely adhered to the dielectric film to form a sensor electrode; Provided with a radio frequency cable connector;
  • the high-voltage cable is provided with a conductive core, an inner semi-conductive layer, an insulating layer, an outer semi-conductive layer, a semi-conductive electric water belt, a corrugated aluminum sheath, an anti-corrosion layer and an outer sheath from the inside to the outside; the inner half The outer periphery of the conductive layer is connected to the dielectric film;
  • One end of the sensor is connected with a connector having a spiral structure inside, and the internal spiral structure of the connector is matched with the corrugated aluminum sheath of the high-voltage cable; the outer circumference of the corrugated aluminum sheath is connected with the inner spiral structure of the connector.
  • the radio frequency cable connector is provided with a shorting cap.
  • the metal casing comprises a first casing and a second casing which are connected to each other in a semicircular arc shape, and the first casing has a first convex portion at one end in the longitudinal direction and a central portion at the other end.
  • a first recessed portion is disposed on the first convex portion along the longitudinal direction of the first housing, and is disposed on both sides of the first recessed portion along the length direction of the first housing
  • the first housing is respectively provided with a first front end screw hole and a first rear end screw hole;
  • a second convex portion is disposed at a central portion of one end of the second casing in the longitudinal direction, a second concave portion is disposed at a middle portion of the other end, and a second central snail is disposed on the second convex portion along the longitudinal direction of the second casing a second front end screw hole and a second rear end screw hole are respectively disposed on the second housing along the length direction of the second housing;
  • the first convex portion cooperates with the second concave portion, and the first central screw hole and the second front end screw hole and the second rear end screw hole form the same connecting screw hole;
  • the second convex portion cooperates with the first concave portion, and the second central screw hole forms a threaded same communication screw hole with the first front end screw hole and the first rear end screw hole.
  • the connector is provided with an engaging groove in a circumferential direction at one end of the sensor, and the sensor is provided with an engaging portion that engages with the engaging groove at one end of the connecting head.
  • the buffer layer is intimately bonded to the metal casing.
  • the dielectric film is a polytetrafluoroethylene material
  • the buffer layer is a silicone rubber material
  • the metal casing is an aluminum material.
  • the invention has the beneficial effects that the invention improves the sensitivity of the partial discharge monitoring of the high voltage cable, is durable, and is convenient to install and disassemble.
  • Figure 1 is a schematic view of the structure of the sensor.
  • Figure 2 is a cross-sectional view of Figure 1.
  • Figure 3 is a schematic enlarged view of the structure A in Figure 2;
  • Figure 4 is a plan view of Figure 1.
  • Figure 5 is a schematic view of the first housing structure.
  • Figure 6 is a schematic view of the structure of the second housing.
  • Figure 7 is a schematic diagram of an equivalent circuit of the present invention.
  • Figure 8 is a cross-sectional view of a high voltage cable.
  • a capacitive high-voltage cable joint partial discharge built-in sensor structure includes a sensor 1 and a high voltage cable 2.
  • the sensor 1 has a cylindrical shape, and is provided with a dielectric film 3, a copper foil electrode 4, a buffer layer 5, and a metal casing 6 from the inside to the outside.
  • the copper foil electrode 4 is closely bonded to the dielectric film 3 to form a complete sensor. 1 electrode.
  • the buffer layer 5 is tightly bonded to the metal casing 6 to form a unit for easy access; the buffer layer 5 is wrapped around the outside of the electrode and is in close contact with the copper foil electrode 4 to ensure that the cable and the cable can be operated during operation and non-operation. Close contact.
  • the dielectric film 3 is a polytetrafluoroethylene material and has excellent properties such as high temperature resistance and corrosion resistance.
  • the buffer layer 5 is a silicone rubber material, and has excellent performance against high temperature, and ensures that the buffer layer does not exhibit performance degradation due to high temperature during operation of the cable.
  • the metal casing 6 is made of aluminum material, and the metal casing 6 is made of the same material as the corrugated aluminum sheath to reduce the contact resistance and loss therebetween.
  • the first outer casing 6a and the second outer casing 6b are connected to each other in a semi-circular cylindrical shape, and the first casing 6a is provided with a first convex portion 10 at a central portion in the longitudinal direction of the first casing 6a.
  • the other end is provided with a first recess 11 on the first boss 10, and a first central screw hole 12 is disposed along the longitudinal direction of the first housing 6a.
  • a first front end screw hole 13a and a first rear end screw hole 13b are respectively disposed on the first housing 6a on both sides of the first recessed portion 11 along the longitudinal direction of the first housing 6a.
  • the second housing 6b is provided with a second protrusion 14 in the middle of one end in the longitudinal direction, a second recess 15 in the middle of the other end, and a second central screw hole in the longitudinal direction of the second housing 6b. 16.
  • a second front end screw hole 17a and a second rear end screw hole 17b are respectively formed in the second housing 6b.
  • the first protrusion 10 is just embedded in the second recess 15, the first central screw hole 12 and the second front screw hole 17a and the second rear screw hole 17b.
  • a connecting screw hole having the same thread is formed, and a screw matched with the thread is inserted into the communicating screw hole, that is, the first housing 6a and the second housing 6b are connected to one side.
  • the second raised portion 14 is just embedded in the first recessed portion 11, and the second central screw hole 16 forms the same threaded connecting hole with the first front end screw hole 13a and the first rear end screw hole 13b, and will cooperate with the aforementioned thread.
  • the screw is inserted into the communication screw hole, that is, the other side of the first housing 6a and the second housing 6b are connected. At this point, the first housing 6a and the second housing 6b are connected into a cylindrical metal housing 6 .
  • the sensor 1 is provided with a radio frequency cable connector 8, which in this embodiment is a TNC connector, and is connected to an external observation processing device.
  • a short-circuit cap 9 is provided on the TNC connector to open the short-circuit cap 9, and the TNC connector can be connected to an external observation processing device. When not in use, close the shorting cap 9 to the TNC connector to prevent the floating potential from appearing when the high voltage cable is running. At the same time, the short-circuiting cap 9 can also isolate the inside of the sensor 1 from the outside, preventing moisture from entering the sensor 1, affecting the measurement.
  • the high-voltage cable 2 is provided with a conductive core 21, an inner semi-conductive layer 22, an insulating layer 23, an outer semi-conductive layer 24, a semi-conductive-resistance water strip 25, a corrugated aluminum sheath 26, an anti-corrosion layer 27, and an external protection from the inside to the outside. Set of 28.
  • the material of the high-voltage cable 2 is peeled off to the inner semi-conductive layer 22, and the sensor 1 is placed outside the inner semi-conductive layer 22 and connected to the dielectric film 3.
  • a connecting end 7 having a spiral structure is connected to one end of the sensor 1.
  • the connecting head 7 is provided with an engaging groove 18 in the circumferential direction at one end of the sensor 1.
  • the sensor 1 is provided with an engaging portion at the end of the connecting head 7 for engaging with the engaging groove 18. 19, the engaging groove 18 is engaged with the engaging portion 19, and the sensor 1 and the connecting head 7 are integrally connected.
  • the internal spiral structure of the connector 7 is matched with the high-voltage cable 2 corrugated aluminum sheath 26 of the high-voltage cable 2, and the high-voltage cable 2 joint is immediately stripped to the end of the inner semi-conductive layer 22 and the stripping material is applied to the corrugated aluminum sheath 26
  • the connector 7 is sleeved outside the corrugated aluminum sheath 26, and the outer periphery of the corrugated aluminum sheath 26 is connected to the inner spiral structure of the connector 7.
  • This embodiment has an equivalent circuit as shown in FIG.
  • the capacitance between the sensor electrode and the cable core can be calculated as follows:
  • ⁇ 0 the permeability of the vacuum, the value is 4 ⁇ 10 -7 H/m;
  • the characteristic impedance of the cable can be calculated as follows:
  • the electrical resistivity of the cable insulation, the cross-linked polyethylene is about 10 14 ⁇ 10 15 ⁇ m;
  • the main influencing factors for the power frequency voltage division at lower frequencies are the values of R and R S , so the power frequency high voltage is mainly at R, and the detection system has only a small voltage drop.
  • the main influence on the transfer function is the ratio of C to C S . It can be known from the sensor structure that the two capacitance values are related to the size of the electrodes in the sensor and the length of the stripped shield, so adjusting the electrode size can further optimize the performance of the sensor.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

本发明公开了一种电容式高压电缆接头局部放电内置传感器结构，包括传感器和高压电缆；传感器呈圆筒状，从内至外至依次设置有：介质薄膜、铜箔电极、缓冲层、金属外壳，铜箔电极与介质薄膜紧密粘合，形成传感器电极；传感器上设置有射频线缆接头；高压电缆从内到外依次设置导电线芯、内半导电层、绝缘层、外半导电层、半导电阻水带、皱纹铝护套、防蚀层、外护套；内半导电层外周与介质薄膜连接；传感器一端连接有内部为螺旋结构的连接头，连接头内部螺旋结构与高压电缆的皱纹铝护套相配合；皱纹铝护套外周与连接头内部螺旋结构连接。本发明提高了高压电缆局部放电监测的灵敏度，经久耐用，安装与拆卸非常方便。

Description

一种电容式高压电缆接头局部放电内置传感器结构 技术领域
本发明涉及一种电气设备局部放电检测仪器领域，特别是涉及一种电容式高压电缆接头局部放电内置传感器结构。
背景技术
随着经济的发展，电力的稳定运行已受到国家的关注，且局部放电监测一直是检验电缆绝缘的非破坏性项目，通过局部放电监测来判断电缆的老化程度。
电缆中间接头是绝缘事故的高发部位，可见，电缆附件已经成为高压电缆线路绝缘的薄弱环节和运行故障的典型部位。电缆附件本身的电气绝缘性能以及电缆的质量和电缆敷设时的影响、安装工艺、环境影响等都会造成电缆运行故障。一旦出现故障，就会造成一定的经济损失。
国内目前主要通过电容型传感器、电感型传感器、天线式传感器等传感装置进行局部放电监测，但是都存在一定的问题，检测精度不高。外置式的传感器由于受到外界电磁信号干扰，检测灵敏度较低，抗干扰能力较差，因此无法长期应用于在线监测。
因此本领域技术人员致力于开发一种监测精度高，可长期应用于监测高压电缆老化程度的电容式高压电缆接头局部放电内置传感器结构。
发明内容
有鉴于现有技术的上述缺陷，本发明所要解决的技术问题是提供一种电容式高压电缆接头局部放电内置传感器结构。
为实现上述目的，本发明提供了一种电容式高压电缆接头局部放电内 置传感器结构，包括传感器和高压电缆；
所述传感器呈圆筒状，从内至外至依次设置有：介质薄膜、铜箔电极、缓冲层、金属外壳，所述铜箔电极与介质薄膜紧密粘合，形成传感器电极；所述传感器上设置有射频线缆接头；
所述高压电缆从内到外依次设置导电线芯、内半导电层、绝缘层、外半导电层、半导电阻水带、皱纹铝护套、防蚀层、外护套；所述内半导电层外周与所述介质薄膜连接；
所述传感器一端连接有内部为螺旋结构的连接头，所述连接头内部螺旋结构与高压电缆的皱纹铝护套相配合；所述皱纹铝护套外周与所述连接头内部螺旋结构连接。
较佳的，所述射频线缆接头上设置有短路帽。
较佳的，所述金属外壳包括呈半圆弧筒状相互连接的第一壳体和第二壳体，所述第一壳体长度方向一端中部设有第一凸起部，另一端中部设有第一凹部，所述第一凸起部上沿所述第一壳体长度方向设有第一中部螺孔，于所述第一凹部两侧，沿所述第一壳体长度方向，在所述第一壳体上分别设有第一前端螺孔和第一后端螺孔；
所述第二壳体长度方向一端中部设有第二凸起部，另一端中部设有第二凹部，所述第二凸起部上沿所述第二壳体长度方向设有第二中部螺孔，于所述第二凹部两侧，沿所述第二壳体长度方向，在所述第二壳体上分别设有第二前端螺孔和第二后端螺孔；
所述第一凸起部与所述第二凹部相配合，所述第一中部螺孔与所述第二前端螺孔和第二后端螺孔形成螺纹相同的连通螺孔；
所述第二凸起部与所述第一凹部相配合，所述第二中部螺孔与所述第一前端螺孔和第一后端螺孔形成螺纹相同的连通螺孔。
较佳的，所述连接头于所述传感器一端沿圆周方向设有卡合槽，所述 传感器于所述连接头一端设有与所述卡合槽配合的卡合部。
较佳的，所述缓冲层与所述金属外壳紧密粘接。
较佳的，所述介质薄膜为聚四氟乙烯材料，所述缓冲层为硅橡胶材料，所述金属外壳为铝材料。
本发明的有益效果是：本发明提高了高压电缆局部放电监测的灵敏度，经久耐用，安装与拆卸非常方便。
附图说明
图1是传感器结构示意图。
图2是图1的剖视图。
图3是图2中A处放大结构示意图。
图4是图1的俯视图。
图5是第一壳体结构示意图。
图6是第二壳体结构示意图。
图7是是本发明的等效电路原理图。
图8是高压电缆剖面图。
具体实施方式
下面结合附图和实施例对本发明作进一步说明：
如图1至图4所示，一种电容式高压电缆接头局部放电内置传感器结构，包括传感器1和高压电缆2。
传感器1呈圆筒状，从内至外至依次设置有：介质薄膜3、铜箔电极4、缓冲层5、金属外壳6，铜箔电极4与介质薄膜3紧密粘合，形成一个完整的传感器1电极。
缓冲层5与金属外壳6紧密粘接，形成一个整体，便于取用；缓冲层5包裹在电极外侧，与铜箔电极4紧密接触，保证电缆在运行与不运行时， 都能让电极与电缆紧密接触。
介质薄膜3为聚四氟乙烯材料，具有耐高温和耐腐蚀等优良的性能。缓冲层5为硅橡胶材料，具有耐高温的优良性能，保证电缆在运行时，缓冲层不会因为高温而出现性能的下降。金属外壳6为铝材料，保证金属外壳6与波纹铝护套的材质相同，减小其间的接触电阻及损耗。
其中，金属外壳6由呈半圆弧筒状相互配合的第一壳体6a和第二壳体6b连接构成，配合方式为第一壳体6a长度方向一端中部设有第一凸起部10，另一端中部设有第一凹部11，第一凸起部10上沿第一壳体6a长度方向设有第一中部螺孔12。于第一凹部11两侧，沿第一壳体6a长度方向，在第一壳体6a上分别设有第一前端螺孔13a和第一后端螺孔13b。
第二壳体6b长度方向一端中部设有第二凸起部14，另一端中部设有第二凹部15，第二凸起部14上沿第二壳体6b长度方向设有第二中部螺孔16，于第二凹部15两侧，沿第二壳体6b长度方向，在第二壳体6b上分别设有第二前端螺孔17a和第二后端螺孔17b。
第一壳体6a与第二壳体6b合起时，第一凸起部10刚好嵌入第二凹部15中，第一中部螺孔12与第二前端螺孔17a和第二后端螺孔17b形成螺纹相同的连通螺孔，将与前述螺纹相配合的螺钉插入连通螺孔中，即实现了第一壳体6a和第二壳体6b一侧连接。
同时，第二凸起部14刚好嵌入第一凹部11，第二中部螺孔16与第一前端螺孔13a和第一后端螺孔13b形成螺纹相同的连通螺孔，将与前述螺纹相配合的螺钉插入连通螺孔中，即实现了第一壳体6a和第二壳体6b的另一侧连接，至此，第一壳体6a与第二壳体6b连接成圆筒状的金属外壳6。
传感器1上设置有射频线缆接头8，本实施例中为TNC接头，连接外部观察处理设备。
TNC接头上设置有短路帽9，打开短路帽9，TNC接头即可与外部观 察处理设备连接。不使用时，将短路帽9盖合在TNC接头上，防止高压电缆运行时，出现悬浮电位。同时短路帽9还可以使传感器1内部与外部隔绝，防止水分进入传感器1，影响测量。
高压电缆2从内到外依次设置导电线芯21、内半导电层22、绝缘层23、外半导电层24、半导电阻水带25、皱纹铝护套26、防蚀层27、外护套28。将高压电缆2接头处剥除外层材料至内半导电层22，传感器1套装在内半导电层22外，与介质薄膜3连接。
传感器1一端连接有内部为螺旋结构的连接头7，连接头7于传感器1一端沿圆周方向设有卡合槽18，传感器1于连接头7一端设有与卡合槽18配合的卡合部19，将卡合槽18与卡合部19卡合上，使传感器1与连接头7连接成一体。
连接头7内部螺旋结构与高压电缆2的高压电缆2皱纹铝护套26相配合，将高压电缆2接头处紧接已剥除至内半导电层22一端剥除外层材料至皱纹铝护套26，连接头7套装在皱纹铝护套26外，皱纹铝护套26外周与连接头7内部螺旋结构连接。
本实施例具有如图7所示的等效电路。
假设：电缆绝缘层的外直径D 1，电缆绝缘层的内直径D 0，真空介电常数ε 0，绝缘材料的相对介电常数ε r。那么，传感器电极与电缆线芯之间的电容可以如下计算：
Figure PCTCN2018099698-appb-000001
式中：
ε 0——真空介电常数，值为8.85×10 -12F/m；
ε r——绝缘材料的相对介电常数，对于XLPE来说，值为2.3；
D 1——电缆绝缘层的外直径；
D 0——电缆绝缘层的内直径。
假设：绝缘层绝缘材料的相对磁导率μ r，
那么在电缆中单位长度的电感可以计算如下：
Figure PCTCN2018099698-appb-000002
式中：
μ 0——真空的磁导率，值为4π×10 -7H/m；
μ r——绝缘材料的相对磁导率；
D 1——电缆绝缘层的外直径；
D 0——电缆绝缘层的内直径。
因此，电缆的特性阻抗可以计算如下：
Figure PCTCN2018099698-appb-000003
假设：电缆长度为l，电缆绝缘的电阻率为ρ，
那么电缆的绝缘电阻可以计算如下
Figure PCTCN2018099698-appb-000004
式中，
ρ——电缆绝缘的电阻率，交联聚乙烯约为10 14～10 15Ω·m；
l——电缆长度；
D 1——电缆绝缘层的外直径；
D 0——电缆绝缘层的内直径。
参照图7可以求出，缆线芯中有放电信号时，传感器耦合检测信号的传递函数为：
Figure PCTCN2018099698-appb-000005
可以看出，较低频率下对于工频电压分压，主要影响因素为R与R S的 值，所以工频高压主要在R，检测系统上只有很小的压降。
对于放电信号等频率较高的信号，对传递函数影响比较大的主要是C和C S的比值。由传感器结构可以知道，两个电容值与传感器中电极尺寸以及剥开的屏蔽层长度有关，所以调节电极尺寸可以进一步优化传感器的性能。
以上详细描述了本发明的较佳具体实施例。应当理解，本领域的普通技术人员无需创造性劳动就可以根据本发明的构思作出诸多修改和变化。因此，凡本技术领域中技术人员依本发明的构思在现有技术的基础上通过逻辑分析、推理或者有限的实验可以得到的技术方案，皆应在由权利要求书所确定的保护范围内。

Claims (6)

  1. 一种电容式高压电缆接头局部放电内置传感器结构，其特征是：包括传感器(1)和高压电缆(2)；
    所述传感器(1)呈圆筒状，从内至外至依次设置有：介质薄膜(3)、铜箔电极(4)、缓冲层(5)、金属外壳(6)，所述铜箔电极(4)与介质薄膜(3)紧密粘合，形成传感器(1)电极；所述传感器(1)上设置有射频线缆接头(8)；
    所述高压电缆(2)从内到外依次设置导电线芯(21)、内半导电层(22)、绝缘层(23)、外半导电层(24)、半导电阻水带(25)、皱纹铝护套(26)、防蚀层(27)、外护套(28)；所述内半导电层(22)外周与所述介质薄膜(3)连接；
    所述传感器(1)一端连接有内部为螺旋结构的连接头(7)，所述连接头(7)内部螺旋结构与高压电缆(2)的皱纹铝护套(26)相配合；所述皱纹铝护套(26)外周与所述连接头(7)内部螺旋结构连接。
  2. 如权利要求1所述的电容式高压电缆接头局部放电内置传感器结构，其特征是：所述射频线缆接头(8)上设置有短路帽(9)。
  3. 如权利要求1所述的电容式高压电缆接头局部放电内置传感器结构，其特征是：所述金属外壳(6)包括呈半圆弧筒状相互连接的第一壳体(6a)和第二壳体(6b)，所述第一壳体(6a)长度方向一端中部设有第一凸起部(10)，另一端中部设有第一凹部(11)，所述第一凸起部(10)上沿所述第一壳体(6a)长度方向设有第一中部螺孔(12)，于所述第一凹部(11)两侧，沿所述第一壳体(6a)长度方向，在所述第一壳体(6a)上分别设有第一前端螺孔(13a)和第一后端螺孔(13b)；
    所述第二壳体(6b)长度方向一端中部设有第二凸起部(14)，另一端中部设有第二凹部(15)，所述第二凸起部(14)上沿所述第二壳体(6b) 长度方向设有第二中部螺孔(16)，于所述第二凹部(15)两侧，沿所述第二壳体(6b)长度方向，在所述第二壳体(6b)上分别设有第二前端螺孔(17a)和第二后端螺孔(17b)；
    所述第一凸起部(10)与所述第二凹部(15)相配合，所述第一中部螺孔(12)与所述第二前端螺孔(17a)和第二后端螺孔(17b)形成螺纹相同的连通螺孔；
    所述第二凸起部(14)与所述第一凹部(11)相配合，所述第二中部螺孔(16)与所述第一前端螺孔(13a)和第一后端螺孔(13b)形成螺纹相同的连通螺孔。
  4. 如权利要求1所述的电容式高压电缆接头局部放电内置传感器结构，其特征是：所述连接头(7)于所述传感器(1)一端沿圆周方向设有卡合槽(18)，所述传感器(1)于所述连接头(7)一端设有与所述卡合槽(18)配合的卡合部(19)。
  5. 如权利要求1所述的电容式高压电缆接头局部放电内置传感器结构，其特征是：所述缓冲层(5)与所述金属外壳(6)紧密粘接。
  6. 如权利要求1所述的电容式高压电缆接头局部放电内置传感器结构，其特征是：所述介质薄膜(3)为聚四氟乙烯材料，所述缓冲层(5)为硅橡胶材料，所述金属外壳(6)为铝材料。
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