CN104931865A - Insulation cover for high-voltage cable line puncture tests and test method - Google Patents
Insulation cover for high-voltage cable line puncture tests and test method Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 79
- 238000009413 insulation Methods 0.000 title claims description 38
- 238000010998 test method Methods 0.000 title abstract description 3
- 239000004020 conductor Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims 11
- 239000004809 Teflon Substances 0.000 claims 1
- 229920006362 Teflon® Polymers 0.000 claims 1
- 230000017105 transposition Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 14
- 229910052751 metal Inorganic materials 0.000 abstract description 14
- 238000009826 distribution Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 7
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 229920002379 silicone rubber Polymers 0.000 description 3
- 239000004945 silicone rubber Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000011162 core material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Abstract
本发明涉及一种高压电缆线路耐压试验用绝缘罩及试验方法，所述的绝缘罩安装在电缆仓高压电缆终端桩头处，用于在高压电缆线路进行耐压试验时，将电缆终端桩头与周围地电位进行隔开，所述的绝缘罩为L形，分为套接部分和引出部分，套接部分和引出部分均为圆筒结构，L形绝缘罩内设置有金属导电体，套接部分直接套接在高压电缆终端桩头上，引出部分用于将电缆终端桩头电位从绝缘罩内部引出至电缆仓外侧。所述的绝缘罩有效地将电缆终端桩头与周围地电位隔开，解决在新型变配电站仓位内进行电缆线路耐压试验时，为避免户内电缆终端桩头与周围地电位距离不足，而采用的传统方法容易导致电缆本体损伤和产生刺鼻气体的问题。
The invention relates to an insulating cover and a test method for a high-voltage cable line withstand voltage test. The insulating cover is installed at the high-voltage cable terminal pile head of the cable warehouse, and is used to place the cable terminal pile on the high-voltage cable line when the high-voltage cable line is subjected to a pressure test. The head is separated from the surrounding ground potential. The insulating cover is L-shaped and is divided into a socket part and a lead-out part. The socket part and the lead-out part are both cylindrical structures, and a metal conductor is arranged inside the L-shaped insulating cover. The socket part is directly socketed on the high-voltage cable terminal pile head, and the lead-out part is used to lead the potential of the cable terminal pile head out from the inside of the insulating cover to the outside of the cable warehouse. The insulating cover effectively separates the pile head of the cable terminal from the surrounding ground potential, and solves the problem of insufficient distance between the pile head of the cable terminal indoors and the surrounding ground potential when carrying out the withstand voltage test of the cable line in the warehouse of the new transformer and distribution station. , and the traditional method used is easy to cause damage to the cable body and the production of pungent gas.
Description
技术领域technical field
本发明涉及电力电缆线路，特别是高压电缆耐压试验，具体涉及一种高压电缆线路耐压试验用绝缘罩及试验方法。The invention relates to a power cable circuit, in particular to a high-voltage cable withstand voltage test, and in particular to an insulating cover and a test method for a high-voltage cable circuit withstand voltage test.
背景技术Background technique
电力电缆线路是电网中传输和分配电能的主要元件之一。在电力线路密集的变电站、开关站、中心站等场合广泛应用电力电缆线路，起着架空线所无法替代的重要作用。国网上海嘉定供电公司管辖着上海嘉定区境内的35kV及10kV电缆线路(以下简称“高压电缆线路”)的运维管理业务。Power cable lines are one of the main elements for the transmission and distribution of electrical energy in the grid. Power cable lines are widely used in substations, switch stations, central stations and other places with dense power lines, playing an important role that overhead lines cannot replace. State Grid Shanghai Jiading Power Supply Company is in charge of the operation and maintenance management business of 35kV and 10kV cable lines (hereinafter referred to as "high voltage cable lines") in Jiading District, Shanghai.
电缆线路耐压试验是电缆线路新工程、停电检修、故障抢修中最常规的一项工作，早期投运的变配电站均为敞开式仓位，电缆终端桩头拆开后与周围地电位空气距离充裕。然而，随着变配电站开关柜封闭式和小型化的发展，其进出高压电缆线路仓位愈发紧凑，从而造成电缆线路在新工程投运前、停电检修后、故障抢修后由于户内电缆终端桩头与周围地电位距离较近，使得耐压试验难以满足实际工作的要求。The withstand voltage test of cable lines is the most routine work in new cable line projects, power outage maintenance, and emergency repairs. The substations and distribution stations put into operation in the early stage are all open positions. The distance is plentiful. However, with the development of closed and miniaturized switch cabinets in substations and distribution stations, the storage space for the incoming and outgoing high-voltage cable lines is becoming more and more compact, which causes the cable lines to be damaged due to indoor cables before the new project is put into operation, after power outage maintenance, and after emergency repair. The distance between the terminal pile head and the surrounding ground potential is relatively close, which makes it difficult for the withstand voltage test to meet the requirements of actual work.
为解决上述问题，传统的方法为：In order to solve the above problems, the traditional method is:
方法一，针对小截面电缆(电缆截面≤120mm2)，利用电缆本体的柔韧性，将电缆终端桩头拉出仓位，如图1所示，从而保持与周围地电位一定距离以满足耐压试验的要求。Method 1: For small-section cables (cable section ≤ 120mm 2 ), use the flexibility of the cable body to pull the cable terminal pile head out of the position, as shown in Figure 1, so as to maintain a certain distance from the surrounding ground potential to meet the withstand voltage test requirements.
该方法对电缆本体有轻微的损伤，且由于电缆移位易造成电缆终端桩头难以重新搭接上。This method has slight damage to the cable body, and it is difficult to re-lap the cable terminal pile head due to the displacement of the cable.
方法二，针对大截面电缆(电缆截面≥240mm2)，由于电缆本体挠性较强，无法仿照方法一来实施，一般采用绝缘毯隔开电缆终端桩头与周围地电位。Method 2, for cables with large cross-section (cable cross-section ≥ 240mm 2 ), due to the strong flexibility of the cable body, method 1 cannot be implemented. Generally, an insulating blanket is used to separate the cable terminal pile head from the surrounding ground potential.
该方法由于绝缘毯表面的脏污以及绝缘结构，表面泄漏电流较大，易造成耐压试验泄漏电流值偏大，无法正确反映电缆本体的泄漏电流值，且当耐压试验值较高时，会产生刺鼻的气体。Due to the dirt on the surface of the insulation blanket and the insulation structure, the surface leakage current is relatively large, which may easily cause the leakage current value of the withstand voltage test to be too large, which cannot correctly reflect the leakage current value of the cable body, and when the withstand voltage test value is high, Produces a pungent gas.
发明内容Contents of the invention
本发明的目的是提供一种高压电缆线路耐压试验用绝缘罩，所述的绝缘罩安装在电缆终端桩头，有效地将电缆终端桩头与周围地电位隔开，用以解决在新型变配电站仓位内进行电缆线路耐压试验时，为避免户内电缆终端桩头与周围地电位距离不足，导致耐压试验难以满足实际工作要求的问题，同时，避免因采用传统方法导致电缆本体损伤和产生刺鼻气体的问题。The object of the present invention is to provide an insulating cover for withstand voltage test of high-voltage cable lines. The insulating cover is installed on the cable terminal pile head to effectively separate the cable terminal pile head from the surrounding ground potential, so as to solve the When carrying out the withstand voltage test of the cable line in the warehouse of the distribution station, in order to avoid the insufficient distance between the pile head of the indoor cable terminal and the surrounding ground potential, the problem that the withstand voltage test is difficult to meet the actual work requirements, and at the same time, to avoid the cable body due to the traditional method. Problems with damage and production of pungent gas.
为实现上述目的，本发明的方案是：一种高压电缆线路耐压试验用绝缘罩，所述的绝缘罩安装在电缆仓高压电缆终端桩头处，用于在高压电缆线路进行耐压试验时，将电缆终端桩头进行遮蔽，与周围地电位保持足够安全距离，所述的绝缘罩为L形，所述的L形绝缘罩分为套接部分和引出部分，所述的套接部分和引出部分均为圆筒结构，所述的L形绝缘罩内设置有金属导电体，所述金属导电体的一端用于耐压试验时连接电缆终端桩头，所述金属导电体的另一端作为引出端通过引出部分穿到绝缘罩外部，用于耐压试验时连接高压引线，所述的套接部分直接套接在高压电缆终端桩头上，所述的引出部分用于将电缆终端桩头电位从绝缘罩内部引出至电缆仓外侧。In order to achieve the above object, the solution of the present invention is: an insulating cover for withstand voltage test of high-voltage cable lines. , shielding the pile head of the cable terminal, keeping a sufficient safe distance from the surrounding ground potential, the insulating cover is L-shaped, and the L-shaped insulating cover is divided into a socket part and a lead-out part, and the socket part and The lead-out parts are all cylindrical structures, the L-shaped insulating cover is provided with a metal conductor, one end of the metal conductor is used to connect the cable terminal pile head during the withstand voltage test, and the other end of the metal conductor is used as The lead-out end passes through the lead-out part to the outside of the insulating cover, and is used to connect the high-voltage lead wire during the withstand voltage test. The socket part is directly socketed on the high-voltage cable terminal pile head, and the lead-out part is used to connect the cable terminal pile head The potential is drawn from the inside of the insulating cover to the outside of the cable compartment.
根据本发明所述的高压电缆线路耐压试验用绝缘罩，所述的套接部分和引出部分均设置有伞裙结构，用以增加沿面爬电距离。According to the insulating cover for high-voltage cable line withstand voltage test of the present invention, the sleeve part and the lead-out part are both provided with shed structures to increase creepage distance along the surface.
根据本发明所述的高压电缆线路耐压试验用绝缘罩，所述的金属导电体与电缆终端桩头采用弹簧压片连接。According to the insulating cover for high-voltage cable line withstand voltage test of the present invention, the metal conductor and the cable terminal pile head are connected by a spring pressure piece.
根据本发明所述的高压电缆线路耐压试验用绝缘罩，所述的弹簧压片可90度转角换位。According to the insulating cover for high-voltage cable line withstand voltage test of the present invention, the spring pressing piece can be rotated at a 90-degree angle.
根据本发明所述的高压电缆线路耐压试验用绝缘罩，所述的金属导电体的材料为铜。According to the insulating cover for high-voltage cable line withstand voltage test of the present invention, the material of the metal conductor is copper.
根据本发明所述的高压电缆线路耐压试验用绝缘罩，所述绝缘罩的材料为聚四氟乙烯。According to the insulating cover for high-voltage cable line withstand voltage test of the present invention, the material of the insulating cover is polytetrafluoroethylene.
根据本发明所述的高压电缆线路耐压试验用绝缘罩，所述的金属导电体的接线端设置有高压引线接孔。According to the insulating cover for withstand voltage test of high-voltage cable lines of the present invention, the terminal of the metal conductor is provided with a high-voltage lead wire connection hole.
根据本发明所述的高压电缆线路耐压试验用绝缘罩，10kV高压电缆的绝缘罩套接部分的内部镂空长度至少为140mm～145mm，套接部分的内部镂空直径至少为51mm～55mm，套接部分的顶部绝缘厚度至少为10mm～12mm，套接部分的边侧绝缘厚度至少为8mm～10mm。According to the insulating cover for high-voltage cable line withstand voltage test of the present invention, the internal hollow length of the socket part of the 10kV high-voltage cable is at least 140 mm to 145 mm, and the internal hollow diameter of the socket part is at least 51 mm to 55 mm. The top insulation thickness of the part is at least 10mm-12mm, and the side insulation thickness of the sleeve part is at least 8mm-10mm.
根据本发明所述的高压电缆线路耐压试验用绝缘罩，35kV高压电缆的绝缘罩套接部分的内部镂空长度至少为190mm～195mm，套接部分的内部镂空直径至少为65mm～70mm，套接部分的顶部绝缘厚度至少为12mm～14mm，套接部分的边侧绝缘厚度至少为10mm～12mm。According to the insulating cover for high-voltage cable line withstand voltage test of the present invention, the internal hollow length of the socket part of the 35kV high-voltage cable is at least 190 mm to 195 mm, and the internal hollow diameter of the socket part is at least 65 mm to 70 mm. The top insulation thickness of the part is at least 12mm-14mm, and the side insulation thickness of the sleeve part is at least 10mm-12mm.
本发明的目的还在于提供一种采用上述绝缘罩进行耐压试验的方法，所述的方法通过绝缘罩的的套接部分有效地将电缆终端桩头与周围地电位隔开，用以解决在新型变配电站仓位内进行电缆线路耐压试验时，为避免户内电缆终端桩头与周围地电位距离不足，导致耐压试验难以满足实际工作要求的问题，同时，避免因采用传统方法导致电缆本体损伤和产生刺鼻气体的问题。The object of the present invention is also to provide a method for carrying out a withstand voltage test using the above-mentioned insulating cover. The method effectively separates the cable terminal pile head from the surrounding ground potential through the socket part of the insulating cover to solve the problem of When carrying out the withstand voltage test of the cable line in the warehouse of the new substation, in order to avoid the insufficient distance between the pile head of the indoor cable terminal and the surrounding ground potential, the withstand voltage test cannot meet the actual work requirements. Problems with damage to the cable body and generation of pungent gas.
为实现上述目的，本发明的方案是：一种采用上述绝缘罩进行耐压试验的方法，准备进行耐压试验时，首先，将三个所述绝缘罩的套接部分分别对应套接在三相电缆终端桩头，将三相电缆终端桩头遮蔽，使其与周围地电位保持足够安全距离；同时，通过绝缘罩的引出部分将电缆终端桩头的电位从绝缘罩内部引至仓位外侧；然后，耐压试验高压引线直接连接绝缘罩内部引出的导电体，开始进行耐压试验。In order to achieve the above object, the solution of the present invention is: a method for carrying out a withstand voltage test using the above-mentioned insulating cover. The phase cable terminal pile head covers the three-phase cable terminal pile head to keep a safe distance from the surrounding ground potential; at the same time, the potential of the cable terminal pile head is led from the inside of the insulation cover to the outside of the warehouse through the lead-out part of the insulation cover; Then, the high-voltage lead wire of the withstand voltage test is directly connected to the conductor drawn from the inside of the insulating cover, and the withstand voltage test is started.
本发明达到的有益效果：The beneficial effect that the present invention reaches:
(1)本发明的绝缘罩安装在电缆终端桩头，有效地遮蔽电缆终端桩头，并与周围地电位保持安全距离，避免耐压试验时，户内电缆终端桩头与周围地电位距离不足，导致耐压试验难以满足实际工作要求；(1) The insulating cover of the present invention is installed on the pile head of the cable terminal, effectively shielding the pile head of the cable terminal, and keeping a safe distance from the surrounding ground potential, so as to avoid insufficient distance between the indoor cable terminal pile head and the surrounding ground potential during the withstand voltage test , making it difficult for the withstand voltage test to meet the actual work requirements;
(2)本发明的绝缘罩设计为L形，分为套接部分和引出部分，套接部分用于遮蔽电缆终端桩头，引出部分用于将电缆终端桩头电位从绝缘罩内部引出至电缆仓位外侧，使耐压试验更加安全可靠，而且本发明的绝缘罩结构简单，携带、安装方便。(2) The insulation cover of the present invention is designed in an L shape, and is divided into a socket part and a lead-out part. The socket part is used to shield the cable terminal pile head, and the lead-out part is used to lead the potential of the cable terminal pile head from the inside of the insulation cover to the cable. The outer side of the position makes the withstand voltage test safer and more reliable, and the insulating cover of the present invention has a simple structure and is convenient to carry and install.
(3)本发明绝缘罩的套接部分和引出部分均设计伞群结构，有效保证安全距离；(3) The socket part and the lead-out part of the insulating cover of the present invention are designed with an umbrella group structure, which effectively ensures a safe distance;
(4)本发明绝缘罩内部金属导电部分与电缆终端桩头采用弹簧压片连接，可保证连接的有效性。(4) The metal conductive part inside the insulating cover of the present invention is connected with the cable terminal pile head by a spring pressure piece, which can ensure the effectiveness of the connection.
(5)本发明弹簧压片可90度转角换位，既满足一般三相电缆的平行排列连接，又可满足三相电缆的垂直排列连接。(5) The spring pressing piece of the present invention can be rotated at a 90-degree angle, which not only satisfies the parallel arrangement and connection of general three-phase cables, but also meets the vertical arrangement and connection of three-phase cables.
(6)本发明的绝缘罩采用聚四氟乙烯材料，成本低、交流击穿强度高。(6) The insulating cover of the present invention adopts polytetrafluoroethylene material, which has low cost and high AC breakdown strength.
(7)本发明绝缘罩的尺寸设计能满足各种截面电缆终端桩头的使用，且不损伤电缆终端本身的硅橡胶绝缘。(7) The size design of the insulating cover of the present invention can meet the use of pile heads of various cross-section cable terminals without damaging the silicone rubber insulation of the cable terminal itself.
附图说明Description of drawings
图1是本发明绝缘罩的安装位置示意图；Fig. 1 is the installation position schematic diagram of insulating cover of the present invention;
图2是本发明绝缘罩的结构示意图。Fig. 2 is a schematic structural view of the insulating cover of the present invention.
图中，1为绝缘罩的套接部分，2为绝缘罩的引出部分，3为伞裙结构，4为金属导电体，5为高压引线接孔。In the figure, 1 is the socket part of the insulating cover, 2 is the lead-out part of the insulating cover, 3 is the shed structure, 4 is the metal conductor, and 5 is the high-voltage lead wire connection hole.
具体实施方式Detailed ways
下面结合附图和具体的实施例对本发明作进一步详细的说明。The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
本发明主要针对高压电缆线路新工程、停电检修、故障修复后进行电缆耐压试验时，位于紧凑型电缆仓位内的电缆终端桩头与周围地电位距离较近，造成无法满足耐压试验电压值要求的问题，设计一种用于遮蔽电缆终端桩头的绝缘罩。The present invention is mainly aimed at carrying out a cable withstand voltage test after a new project of a high-voltage cable line, power outage maintenance, and fault repair. The distance between the pile head of the cable terminal located in the compact cable warehouse and the surrounding ground potential is relatively close, resulting in the failure to meet the voltage value of the withstand voltage test. To meet the required problem, design an insulating cover for shielding the pile head of the cable terminal.
如图1所示，本发明的绝缘罩安装在电缆仓高压电缆终端桩头处，用于在高压电缆线路进行耐压试验时，将电缆终端桩头进行遮蔽，使其与周围地电位保持足够安全距离，避免耐压试验时因户内电缆终端桩头与周围地电位距离的不足，使得耐压试验难以满足实际工作的要求。As shown in Figure 1, the insulation cover of the present invention is installed at the pile head of the high-voltage cable terminal in the cable warehouse, and is used to shield the pile head of the cable terminal when the high-voltage cable line is subjected to a voltage test, so that it can be kept sufficiently close to the surrounding ground potential. Safe distance, avoiding the insufficient distance between the pile head of the indoor cable terminal and the surrounding ground potential during the withstand voltage test, which makes it difficult for the withstand voltage test to meet the requirements of actual work.
如图2所示，本发明所述的绝缘罩为L形，所述的L形绝缘罩分为套接部分1和引出部分2，所述的套接部分和引出部分均为圆筒结构，所述套接部分1和引出部分2的内部连通，所述的L形绝缘罩内设置有金属导电体4，所述金属导电体4的一端用于耐压试验时连接电缆终端桩头，所述金属导电体4的另一端作为引出端通过引出部分穿到绝缘罩外部，用于耐压试验时连接高压引线，所述的套接部分1直接套接在高压电缆终端桩头上，所述的引出部分2用于将电缆终端桩头电位从绝缘罩内部引出至电缆仓外侧。绝缘罩的套接部分和引出部分均设置有伞裙结构3，用以增加沿面爬电距离，有效保证安全距离。As shown in Figure 2, the insulating cover of the present invention is L-shaped, and the L-shaped insulating cover is divided into a socket part 1 and a lead-out part 2, and the socket part and the lead-out part are both cylindrical structures, The inside of the sleeve part 1 and the lead-out part 2 are connected, and a metal conductor 4 is arranged inside the L-shaped insulating cover, and one end of the metal conductor 4 is used to connect the cable terminal pile head during the pressure test. The other end of the metal conductor 4 is used as the lead-out end to pass through the lead-out part to the outside of the insulating cover, and is used to connect the high-voltage lead wire during the withstand voltage test. The socket part 1 is directly socketed on the high-voltage cable terminal pile head. The lead-out part 2 is used to lead the potential of the cable terminal pile head out from the inside of the insulation cover to the outside of the cable warehouse. The shed structure 3 is provided on the socket part and the lead-out part of the insulating cover to increase the creepage distance along the surface and effectively ensure the safety distance.
将本发明的绝缘罩用于耐压试验时，准备进行耐压试验时，首先，将三个所述绝缘罩的套接部分分别对应套接在三相电缆终端桩头，将三相电缆终端桩头遮蔽，使其与周围地电位保持足够安全距离；同时，通过绝缘罩的引出部分将电缆终端桩头的电位从绝缘罩内部引至仓位外侧；然后，耐压试验高压引线直接连接绝缘罩内部引出的导电体，开始进行耐压试验。其中，高压引线通过高压引线接孔5与金属导电体4连接。When the insulating cover of the present invention is used for the withstand voltage test, when preparing to carry out the withstand voltage test, first, the socket parts of the three insulating covers are correspondingly socketed on the pile heads of the three-phase cable terminals, and the three-phase cable terminal The pile head is shielded to keep a safe enough distance from the surrounding ground potential; at the same time, the potential of the cable terminal pile head is led from the inside of the insulation cover to the outside of the warehouse through the lead-out part of the insulation cover; then, the high-voltage lead wire of the withstand voltage test is directly connected to the insulation cover Conductors drawn from inside are subjected to withstand voltage test. Wherein, the high-voltage lead is connected to the metal conductor 4 through the high-voltage lead connection hole 5 .
实施例一：Embodiment one:
本实施例一针对高压电缆线路10kV常规电缆，其截面为70mm2，120mm2,240mm2,400mm2四种，具体尺寸参见表一。This embodiment 1 is aimed at 10kV conventional cables of high-voltage cable lines, which have four cross-sections of 70mm 2 , 120mm 2 , 240mm 2 , and 400mm 2 . See Table 1 for specific dimensions.
表一 高压电缆户内10KV电缆终端桩头尺寸表Table 1 High-voltage cable indoor 10KV cable terminal pile head size table
本实施例综合考虑各种截面电缆终端桩头均可使用且不损伤电缆终端本身的硅橡胶绝缘，10kV高压电缆的绝缘罩套接部分的内部镂空长度至少为140mm～145mm，为使电缆终端桩头能够安装上绝缘罩，绝缘罩的设计直径应略大于同一电压等级下最大尺寸桩头的宽度，10kV高压电缆的绝缘罩套接部分的内部镂空直径至少为51mm～55mm。绝缘罩套接部分的顶部绝缘厚度至少为10mm～12mm，套接部分的边侧绝缘厚度至少为8mm～10mm，此绝缘厚度可满足规定耐压试验值的要求并留有充分裕度。In this embodiment, comprehensively considering that the pile heads of cable terminals with various cross-sections can be used without damaging the silicone rubber insulation of the cable terminal itself, the internal hollow length of the sleeve part of the insulation cover of the 10kV high-voltage cable is at least 140 mm to 145 mm, in order to make the cable terminal pile The head can be installed with an insulating cover. The design diameter of the insulating cover should be slightly larger than the width of the largest pile head at the same voltage level. The internal hollow diameter of the insulating cover socket part of the 10kV high-voltage cable is at least 51mm to 55mm. The top insulation thickness of the socket part of the insulation cover is at least 10mm ~ 12mm, and the side insulation thickness of the socket part is at least 8mm ~ 10mm. This insulation thickness can meet the requirements of the specified withstand voltage test value and leave sufficient margin.
在进行耐压试验时，从户内电缆终端桩头上引出高压引线，要求绝缘罩的绝缘部分具有能够承受常规耐受电压值的能力，避免电缆终端桩头对周围地电位产生爬电或直接放电现象。将电气工业应用中的常规绝缘材料从相对介电常数、交流击穿强度、机械加工性能以及经济性四个角度进行比较，本实施例采用聚四氟乙烯材料作为绝缘罩的绝缘部分材料，聚四氟乙烯满足可加工性，成本低，且交流击穿强度高。When carrying out the withstand voltage test, the high-voltage lead wires are drawn from the pile head of the indoor cable terminal. discharge phenomenon. Comparing conventional insulating materials in electrical industry applications from the perspectives of relative permittivity, AC breakdown strength, machinability and economy, this example uses polytetrafluoroethylene material as the insulating part material of the insulating cover, polytetrafluoroethylene Tetrafluoroethylene satisfies machinability, low cost, and high AC breakdown strength.
本实施例选择铜材料作为绝缘罩内部的导电体的材料，铜材料的特点主要为电导系数大、机械强度相当高，加工容易和耐腐蚀，并且高压电力电缆线芯材料普遍使用铜材料，采用铜材料作为内部导电体的材料，可以保证辅助电极与电缆线芯连接时，接触电阻小且避免在实际使用过程中偶发状态造成辅助电极断裂。In this embodiment, copper material is selected as the material of the conductor inside the insulating cover. The characteristics of copper material are mainly large electrical conductivity, high mechanical strength, easy processing and corrosion resistance, and copper material is generally used as the core material of high-voltage power cables. Copper material is used as the material of the internal conductor, which can ensure that when the auxiliary electrode is connected to the cable core, the contact resistance is small and avoid the auxiliary electrode from being broken due to accidental conditions during actual use.
本实施例中，所述的金属导电与电缆终端桩头采用弹簧压片连接，可保证连接的有效性，所述的弹簧压片可90度转角换位，既满足一般三相平行排列连接，又可满足三相垂直排列连接。In this embodiment, the metal conductor and the cable terminal pile head are connected by a spring pressing piece, which can ensure the effectiveness of the connection. The spring pressing piece can be rotated at a 90-degree angle, which not only meets the general three-phase parallel arrangement connection, It can also meet the three-phase vertical arrangement connection.
将本发明的绝缘罩用于耐压试验时，三相电缆的每一相终端桩头均对应设置一个绝缘罩，三个绝缘罩同时遮蔽对应相的电缆终端桩头，将电缆终端桩头与周围地电位隔离开，使电缆终端桩头与周围地电位保持足够安全距离，并通过引出部分将电缆终端桩头的电位从绝缘罩内部引至仓位外侧，耐压试验高压引线直接连接绝缘罩内部引出的导电体的引出端，进行耐压试验，试验过程更加安全可靠，下表二为试验效果表：When the insulating cover of the present invention is used for the withstand voltage test, each phase terminal pile head of the three-phase cable is correspondingly provided with an insulating cover, and the three insulating covers simultaneously cover the cable terminal pile heads of the corresponding phase, and the cable terminal pile head and the The surrounding ground potential is isolated to keep a safe distance between the cable terminal pile head and the surrounding ground potential, and the potential of the cable terminal pile head is led from the inside of the insulation cover to the outside of the warehouse through the lead-out part, and the high-voltage lead wire of the withstand voltage test is directly connected to the inside of the insulation cover The lead-out end of the lead-out conductor is subjected to a withstand voltage test. The test process is safer and more reliable. The following table 2 is the test result table:
表二 10KV电缆用绝缘罩试验效果表Table 2 10KV cable insulation cover test results table
本实施例的绝缘罩在规定耐压试验电压值下，泄漏电流值较小，无击穿、无爬电、无发热等现象，符合设计要求。The insulating cover of this embodiment has a small leakage current value, no breakdown, no creepage, no heat generation, etc. under the specified voltage value of the withstand voltage test, which meets the design requirements.
实施例二：Embodiment two:
本实施例二与实施例一相比，区别仅在于设计尺寸的不同，35kV常规电缆截面为400mm2和630mm2两种，具体尺寸参见表三。Compared with the first embodiment, the second embodiment differs only in the design size. The cross section of the 35kV conventional cable is 400mm 2 and 630mm 2 . See Table 3 for the specific size.
表三 高压电缆户内35KV电缆终端桩头尺寸表Table 3 High-voltage cable indoor 35KV cable terminal pile head size table
本实施例综合考虑各种截面电缆终端桩头均可使用且不损伤电缆终端本身的硅橡胶绝缘，35kV高压电缆的绝缘罩套接部分的内部镂空长度至少为190mm～195mm，为使电缆终端桩头能够安装上绝缘罩，绝缘罩的设计直径应略大于同一电压等级下最大尺寸桩头的宽度，35kV高压电缆的绝缘罩套接部分的内部镂空直径至少为65mm～70mm。绝缘罩套接部分的顶部绝缘厚度至少为12mm～14mm，套接部分的边侧绝缘厚度至少为10mm～12mm，此绝缘厚度可满足规定耐压试验值的要求并留有充分裕度。In this embodiment, comprehensively considering that the pile heads of cable terminals with various cross-sections can be used without damaging the silicone rubber insulation of the cable terminal itself, the internal hollow length of the sleeve part of the insulation cover of the 35kV high-voltage cable is at least 190 mm to 195 mm, in order to make the cable terminal pile The head can be installed with an insulating cover. The design diameter of the insulating cover should be slightly larger than the width of the largest pile head at the same voltage level. The internal hollow diameter of the insulating cover socket part of the 35kV high-voltage cable is at least 65mm to 70mm. The top insulation thickness of the socket part of the insulation cover is at least 12mm ~ 14mm, and the side insulation thickness of the socket part is at least 10mm ~ 12mm. This insulation thickness can meet the requirements of the specified withstand voltage test value and leave a sufficient margin.
下表四为35KV高压电缆绝缘罩用于试验效果表：The following table 4 is the test effect table of the 35KV high voltage cable insulation cover:
表四 35KV电缆用绝缘罩试验效果表Table 4 35KV cable insulation cover test effect table
本实施例的绝缘罩在规定耐压试验电压值下，泄漏电流值较小，无击穿、无爬电、无发热等现象，符合设计要求。The insulating cover of this embodiment has a small leakage current value, no breakdown, no creepage, no heat generation, etc. under the specified voltage value of the withstand voltage test, which meets the design requirements.
通过本发明研制的10kV及35kV电缆线路耐压试验用绝缘罩，可在紧凑型电缆仓位内对电缆线路进行耐压试验，同时避免了传统方法的弊端。本发明的绝缘罩安装在电缆终端桩头，有效地遮蔽电缆终端桩头，并与周围地电位保持安全距离，避免耐压试验时，户内电缆终端桩头与周围地电位距离不足，导致耐压试验难以满足实际工作要求。同时，本发明绝缘罩包括套接部分和引出部分，通过引出部分将电缆终端桩头电位从绝缘罩内部引出至电缆仓位外侧，使耐压试验更加安全可靠。Through the insulating cover for the withstand voltage test of 10kV and 35kV cable lines developed by the invention, the withstand voltage test of the cable lines can be carried out in a compact cable storage space, while avoiding the disadvantages of the traditional method. The insulating cover of the present invention is installed on the pile head of the cable terminal, effectively shields the pile head of the cable terminal, and keeps a safe distance from the surrounding ground potential, so as to avoid the insufficient distance between the indoor cable terminal pile head and the surrounding ground potential during the withstand voltage test, resulting in The pressure test is difficult to meet the actual work requirements. At the same time, the insulating cover of the present invention includes a socket part and a lead-out part, through which the potential of the cable terminal pile head is led out from the inside of the insulating cover to the outside of the cable storage space, making the withstand voltage test safer and more reliable.
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