技术领域technical field
本发明专利属于变电设备带电监测领域，涉及电力电缆，尤其是电力开关柜内XLPE电力电缆局部放电在线监测方法。The patent of the invention belongs to the live monitoring field of power transformation equipment, and relates to a power cable, especially an online monitoring method for partial discharge of an XLPE power cable in a power switch cabinet.
背景技术Background technique
随着部分交联聚乙烯(XLPE)电力电缆运行时间的逐渐增加；由电缆附件以及电缆本体绝缘故障引发的电力事故也在不断的增加，尤以电缆附件发生事故为多。With the gradual increase of the running time of some cross-linked polyethylene (XLPE) power cables; the electrical accidents caused by cable accessories and cable body insulation failures are also increasing, especially the accidents of cable accessories.
监测XLPE电缆内的局部放电可以很好的反映电缆的绝缘状态，国内外专家学者及国际电力权威机构一致认为局部放电试验是XLPE电力电缆绝缘状况评价的最佳方法。然而，国内电缆局部放电在线监测技术起步于十几年前，如何在线诊断电缆及其附件的绝缘状况,及时发现故障隐患，具有非常重要的现实意义。Monitoring the partial discharge in the XLPE cable can reflect the insulation state of the cable very well. Experts and scholars at home and abroad and international power authorities agree that the partial discharge test is the best method for evaluating the insulation state of the XLPE power cable. However, domestic cable partial discharge on-line monitoring technology started more than ten years ago. How to diagnose the insulation status of cables and their accessories online and find hidden faults in time has very important practical significance.
当XLPE电缆绝缘内部存在缺陷时，会导致局部放电的发生。局部放电发生时，会在电缆内产生脉冲电流。因此，XLPE电缆局放的监测方法有一种高频电流法。高频电流法直接监测电缆内局部放电发生时的脉冲电流，能更加真实地反映脉冲波形等特点，正在被广泛的研究和应用。When there is a defect inside the XLPE cable insulation, it will lead to the occurrence of partial discharge. When partial discharge occurs, a pulse current will be generated in the cable. Therefore, there is a high-frequency current method for monitoring partial discharge of XLPE cables. The high-frequency current method directly monitors the pulse current when partial discharge occurs in the cable, which can more truly reflect the pulse waveform and other characteristics, and is being widely studied and applied.
高频电流法监测XLPE电缆局部放电的原理是，将高频电流传感器(罗戈夫斯基线圈)放在电缆终端侧，让电缆蔽层的接地线或者未屏蔽的单相电缆穿过，线圈耦合局放脉冲电流周围产生的电磁场信号，来监测XLPE电缆局部放电信号。高频电流法的监测频带通常在几十kHz到几十MHz之间，能够有效地获取局部放电的脉冲电流信号，高频电流传感器安装简便，是一种非侵入式的监测方法，安全可靠。目前，在开关柜内应用还处于研究阶段，且开关柜内结构紧凑，已运行的开关柜并未预留高频电流传感器的安装位置。The principle of the high-frequency current method to monitor the partial discharge of XLPE cables is to place the high-frequency current sensor (Rogowski coil) on the cable terminal side, let the ground wire of the cable shielding layer or the unshielded single-phase cable pass through, and the coil coupling local The electromagnetic field signal generated around the discharge pulse current is used to monitor the partial discharge signal of the XLPE cable. The monitoring frequency band of the high-frequency current method is usually between tens of kHz and tens of MHz, which can effectively obtain the pulse current signal of partial discharge. The high-frequency current sensor is easy to install, and it is a non-invasive monitoring method, which is safe and reliable. At present, the application in the switchgear is still in the research stage, and the structure of the switchgear is compact, and the switchgear that has been in operation does not reserve the installation position of the high-frequency current sensor.
发明内容Contents of the invention
本发明的目的在于克服现有技术的不足，发明了一种结合了高频电流互感器和零序电流互感器的复合电流传感器。该传感器同时监测工频电流和高频电流，且安装方便，不改变开关柜内结构，能够在现有开关柜内进行安装，实现电力电缆局部放电监测和工频小信号电流监测。方便了运维人员巡视、保障开关柜健康无故障运行。The purpose of the present invention is to overcome the deficiencies of the prior art, and to invent a composite current sensor combining a high-frequency current transformer and a zero-sequence current transformer. The sensor monitors power frequency current and high frequency current at the same time, and is easy to install without changing the structure of the switch cabinet. It can be installed in the existing switch cabinet to realize power cable partial discharge monitoring and power frequency small signal current monitoring. It is convenient for the operation and maintenance personnel to inspect and ensure the healthy and trouble-free operation of the switchgear.
本发明解决技术问题所采用的技术方案是：The technical scheme that the present invention solves technical problem adopts is:
一种用于开关柜内XLPE电力电缆的复合电流传感器，包括磁芯、高频电流互感器线圈、零序电流互感器线圈，在磁芯上绕制匝数较少、线径粗的高频电流互感器线圈，高频电流互感器线圈通过同轴电缆引出，在高频电流互感器线圈的外侧磁芯上绕制匝数多、线径细的零序电流互感器线圈，零序电流互感器线圈通过导线引出，在零序电流互感器线圈外侧浇注环氧树脂。A composite current sensor for XLPE power cables in switch cabinets, including a magnetic core, a high-frequency current transformer coil, and a zero-sequence current transformer coil, and a high-frequency sensor with a small number of turns and a thick wire diameter is wound on the magnetic core Current transformer coils, high-frequency current transformer coils are led out through coaxial cables, and zero-sequence current transformer coils with many turns and thin wire diameters are wound on the outer magnetic core of the high-frequency current transformer coils, zero-sequence current transformer coils The coil of the transformer is led out through wires, and epoxy resin is poured outside the coil of the zero-sequence current transformer.
一种用于开关柜内XLPE电力电缆的复合电流传感器的安装方法，将复合传感器套接在XLPE电缆终端电缆分叉处，避开电缆屏蔽层接地线。The invention relates to an installation method of a composite current sensor used for an XLPE power cable in a switch cabinet. The composite sensor is sleeved on the XLPE cable terminal cable bifurcation, and the grounding wire of the cable shielding layer is avoided.
本发明以整合零序电流互感器和高频电流互感器为核心，主要部件为环形磁性、工频感应线圈、高频感应线圈及外壳二次端子等。本发明选取铁氧体为高频线圈和工频感应线圈的磁芯。两个线圈分别绕制在磁芯上，同时用环氧树脂封装，两个线圈中心频率不同，正常工作时不相互影响。The core of the invention is the integration of the zero-sequence current transformer and the high-frequency current transformer, and the main components are ring magnetism, power frequency induction coil, high-frequency induction coil and secondary terminal of the casing. The present invention selects ferrite as the magnetic core of the high frequency coil and the power frequency induction coil. The two coils are respectively wound on the magnetic core and encapsulated with epoxy resin at the same time. The center frequencies of the two coils are different, and they do not affect each other during normal operation.
(1)本项目通过将复合电流传感器套接在XLPE电缆终端电缆分叉处，避开电缆屏蔽层接地线，为一种非侵入式的监测方法，安全可靠。该方法克服了超声波法、超高频法等不能监测电缆全长的缺点，且抗干扰性强，能更加真实地反映局部放电波形。(1) This project is a non-invasive monitoring method, which is safe and reliable, by connecting the composite current sensor at the bifurcation of the XLPE cable terminal and avoiding the grounding wire of the cable shielding layer. This method overcomes the shortcomings of the ultrasonic method and the ultra-high frequency method that cannot monitor the entire length of the cable, and has strong anti-interference performance, and can more truly reflect the partial discharge waveform.
(2)为了改善高频电流传感器性能，在确定线圈带宽后，需要选取磁性材料，本文拟选取锰锌铁氧体或镍锌铁氧体为电流传感器磁芯。(2) In order to improve the performance of the high-frequency current sensor, after determining the coil bandwidth, it is necessary to select a magnetic material. This paper intends to select manganese-zinc ferrite or nickel-zinc ferrite as the current sensor core.
(3)复合电流传感器将高频电流互感器和零序电流互感器合为一体，避免了开关柜在未预留高频传感器安装位置的情况下，高频电流传感器安装困难的问题，同时最大限度靠近开关柜内XLPE电缆接头部位，监测灵敏。(3) The composite current sensor integrates the high-frequency current transformer and the zero-sequence current transformer, which avoids the problem of difficult installation of the high-frequency current sensor when the switchgear does not reserve a high-frequency sensor installation position, and at the same time the maximum The limit is close to the XLPE cable joint in the switch cabinet, and the monitoring is sensitive.
(4)高频电流传感器引出线为带屏蔽的单芯电缆，匹配阻抗50欧姆，零序电流互感器引出线为普通的铜导线。(4) The lead-out wire of the high-frequency current sensor is a shielded single-core cable with a matching impedance of 50 ohms, and the lead-out wire of the zero-sequence current transformer is an ordinary copper wire.
本发明的优点和积极效果是：Advantage and positive effect of the present invention are:
1、本复合电流传感器解决了运维人员对开关柜内XLPE电力电缆在线监测困难的问题，克服了现有红外、紫外、超声、特高频技术进行监测的缺陷，有效地监控电力电缆的健康状况，避免开关柜内电力电缆因绝缘故障引发的停电及重大事故。1. This composite current sensor solves the problem that operation and maintenance personnel have difficulty in online monitoring of XLPE power cables in switch cabinets, overcomes the defects of existing infrared, ultraviolet, ultrasonic, and UHF technology for monitoring, and effectively monitors the health of power cables situation, to avoid power outages and major accidents caused by insulation failures of power cables in switch cabinets.
2、本复合电流传感器原理简单，通过制作高频电流互感器和零序电流互感器的复合电流传感器，安装简易，不改变开关柜内结构。安装好后，能够在不停电的情况下实现对开关柜内电力电缆的局部放电在线监测，保障了电力电缆健康无故障的运行。2. The principle of the composite current sensor is simple. By making a composite current sensor of high-frequency current transformer and zero-sequence current transformer, it is easy to install and does not change the structure of the switch cabinet. After installation, the on-line partial discharge monitoring of the power cables in the switchgear can be realized without power failure, ensuring the healthy and trouble-free operation of the power cables.
3.XLPE电缆局部放电在线监测系统在一定程度上提高的电气设备的智能性，替代的普通运维人员对电缆的巡视，节省了大量的劳动力，且有更高的准确性，为电网的稳定提供保障。3. The XLPE cable partial discharge on-line monitoring system improves the intelligence of electrical equipment to a certain extent, and replaces the inspection of cables by ordinary operation and maintenance personnel, which saves a lot of labor and has higher accuracy, which contributes to the stability of the power grid. provide assurance.
附图说明Description of drawings
图1为复合电流传感器的结构图；Fig. 1 is the structural diagram of composite current sensor;
图2为复合电流传感器安装位置图。Figure 2 is a diagram of the installation position of the composite current sensor.
具体实施方式detailed description
下面结合附图并通过具体实施例对本发明作进一步详述，以下实施例只是描述性的，不是限定性的，不能以此限定本发明的保护范围。The present invention will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.
本复合电流传感器将铁氧体磁芯1作为复合电流传感器的磁芯，在磁芯上首先绕制匝数较少、线径较粗的高频电流互感器线圈3，绕制好线圈后，将线圈用同轴电缆4引出，在线圈外侧绕制匝数多、线径细的零序电流互感器线圈2，绕制好后，用普通导线5引出。最后用环氧树脂将复合电流互感器浇筑。保护互感器内部的线圈。零序电流互感器的引出线为零序电流二次线；同轴电缆为高频电流互感器引出线。In this composite current sensor, the ferrite core 1 is used as the core of the composite current sensor. On the core, a high-frequency current transformer coil 3 with a small number of turns and a thick wire diameter is wound first. After the coil is wound, The coil is led out with a coaxial cable 4, and a zero-sequence current transformer coil 2 with a large number of turns and a thin wire diameter is wound outside the coil. After winding, it is led out with an ordinary wire 5. Finally, pour the composite current transformer with epoxy resin. Protect the coil inside the transformer. The lead-out line of the zero-sequence current transformer is the secondary line of the zero-sequence current; the coaxial cable is the lead-out line of the high-frequency current transformer.
本复合电流传感器的安装如图2，6为电缆终端的某一相接头，7为三相电缆接头分叉处，将复合传感器套接在电缆接头分叉处下侧，将分叉处引出的接地线8穿过复合传感器，零序电流二次引出线可测量电缆零序电流；高频电流互感器引出线可测量电缆内局部放电产生的脉冲电流信号。The installation of the composite current sensor is shown in Figure 2. 6 is a certain phase joint of the cable terminal, and 7 is the bifurcation of the three-phase cable joint. The composite sensor is sleeved on the lower side of the bifurcation of the cable joint, and the The grounding wire 8 passes through the composite sensor, and the secondary lead-out line of the zero-sequence current can measure the zero-sequence current of the cable; the lead-out line of the high-frequency current transformer can measure the pulse current signal generated by partial discharge in the cable.
所述的复合传感器故障时，不影响电力电缆线路的正常运行。When the composite sensor fails, it does not affect the normal operation of the power cable line.
本发明经过实验室试验，完全符合《国家电网公司电力安全工作规程(变电部分)》中的要求，可在现场应用。The invention has been tested in a laboratory, and fully complies with the requirements in the "State Grid Corporation of Electricity Safety Work Regulations (Transformation Part)", and can be applied on the spot.
以上所述的仅是本发明的优选实施方式，应当指出，对于本领域的普通技术人员来说，在不脱离发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。What has been described above is only a preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, some modifications and improvements can be made without departing from the inventive concept, and these all belong to the scope of the present invention. protected range.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610584512.6ACN106199357A (en) | 2016-07-20 | 2016-07-20 | A kind of recombination current sensor of XLPE power cable in switch cubicle |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610584512.6ACN106199357A (en) | 2016-07-20 | 2016-07-20 | A kind of recombination current sensor of XLPE power cable in switch cubicle |
| Publication Number | Publication Date |
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| CN106199357Atrue CN106199357A (en) | 2016-12-07 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610584512.6APendingCN106199357A (en) | 2016-07-20 | 2016-07-20 | A kind of recombination current sensor of XLPE power cable in switch cubicle |
| Country | Link |
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| CN (1) | CN106199357A (en) |
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| RJ01 | Rejection of invention patent application after publication | Application publication date:20161207 | |
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