CN111239566A - A high-sensitivity high-frequency pulse current sensor - Google Patents

Abstract

The invention discloses a high-sensitivity high-frequency pulse current sensor, which comprises a nickel-zinc soft magnetic ferrite ring; a pvc plastic ring with uniform periphery is embedded outside the nickel-zinc soft magnetic ferrite ring; a plurality of hollow groove bodies are uniformly arranged on the pvc plastic ring; the enameled wire penetrates through the hollowed groove body on the pvc plastic ring and is uniformly wound on the nickel-zinc soft magnetic ferrite; a winding coil formed by winding the enameled wire is externally provided with a shielding case; a shielding shell is arranged outside the shielding cover for packaging; an integral resistor arranged between the shielding cover and the shielding shell is connected with the winding coil. The invention effectively reduces the influence on the performance of the sensor caused by stray capacitance, skin effect and environmental interference, has no direct electrical contact with high-voltage electrical equipment, has excellent safety performance and has no influence on the normal operation of the electrical equipment.

Description

Translated fromChinese

一种高灵敏度高频脉冲电流传感器A high-sensitivity high-frequency pulse current sensor

技术领域technical field

本发明属于高压设备局部放电检测的技术领域，具体涉及一种高灵敏度高频脉冲电流传感器。The invention belongs to the technical field of partial discharge detection of high-voltage equipment, in particular to a high-sensitivity high-frequency pulse current sensor.

背景技术Background technique

目前我国电力系统正朝着特高压、大规模、远距离、智能化以及清洁能源开发利用的方向发展。随着我国经济的不断发展，对发电设备装机容量的要求也越来越高，电气设备的安全运行是电网安全可靠运行的重要保障，这就对电气设备运行的安全性和可靠性提出了更严格的要求。电气设备绝缘好坏直接决定了电气设备是否能够安全可靠运行。因此，对于电气设备绝缘系统的在线监测至关重要。At present, my country's power system is developing in the direction of UHV, large-scale, long-distance, intelligent and clean energy development and utilization. With the continuous development of my country's economy, the requirements for the installed capacity of power generation equipment are getting higher and higher, and the safe operation of electrical equipment is an important guarantee for the safe and reliable operation of the power grid. strict requirements. The insulation quality of electrical equipment directly determines whether the electrical equipment can operate safely and reliably. Therefore, it is very important for online monitoring of electrical equipment insulation system.

局部放电是判断电气设备绝缘系统好坏的有效评估手段。局部放电当前使用的检测手段主要有两种，一种是电测法，一种是非电测法。电测法主要有脉冲电流法、高频脉冲电流法、超高频检测法等；非电检测法主要有：温度检测法、超声波检测法、光检测法等。其中，电测法具有较高的灵敏度，能够实现在线定量测量。而非电检测法灵敏度较低，不能实现定量检测。高频脉冲电流法作为电测法中的一种，是一种非侵入式检测方法，由于其结构简单，安装方便，受外界电磁干扰小，灵敏度较高而被越来越多地用在高压电气设备的局部放电在线检测中。Partial discharge is an effective evaluation method to judge the quality of electrical equipment insulation system. There are two main detection methods currently used for partial discharge, one is electrical measurement method and the other is non-electrical measurement method. Electrical measurement methods mainly include pulse current method, high-frequency pulse current method, ultra-high frequency detection method, etc.; non-electrical detection methods mainly include temperature detection method, ultrasonic detection method, optical detection method, etc. Among them, the electrical measurement method has high sensitivity and can realize online quantitative measurement. The non-electric detection method has low sensitivity and cannot achieve quantitative detection. As one of the electrical measurement methods, the high-frequency pulse current method is a non-invasive detection method. Due to its simple structure, convenient installation, little external electromagnetic interference and high sensitivity, it is increasingly used in high-voltage applications. Partial discharge on-line detection of electrical equipment.

高压电气设备内部发生局部放电的瞬间，会产生一个高频脉冲电流，其通过高低压侧或接地部分的分布电容耦合到接地线上，并通过接地线进入大地。因此，通过在接地线接上一个高频脉冲电流传感器，当时变脉冲电流通过传感器磁芯中心时，会在磁芯中引起高频交变磁场从而在线圈中产生感应电流。感应电流通过与线圈连接的积分电阻转换为电压信号。When partial discharge occurs inside high-voltage electrical equipment, a high-frequency pulse current will be generated, which is coupled to the grounding line through the distributed capacitance of the high and low voltage sides or the grounding part, and enters the earth through the grounding line. Therefore, by connecting a high-frequency pulse current sensor to the ground wire, when the time-varying pulse current passes through the center of the magnetic core of the sensor, a high-frequency alternating magnetic field will be induced in the magnetic core and an induced current will be generated in the coil. The induced current is converted into a voltage signal through an integrating resistor connected to the coil.

为适用于现场环境下的局部放电测试，高频脉冲电流传感器要求要有足够高的灵敏度和足够宽的频带。高频脉冲电流传感器检测技术目前发展已经相对成熟。但由于受到绕组线圈之间距离影响，往往存在杂散电容。绕组的选取及线圈的缠绕方式会影响功率的传输效率。此外，外界电磁干扰的存在也严重影响了高频脉冲电流传感器的灵敏度。In order to be suitable for partial discharge test in field environment, high-frequency pulse current sensor requires high enough sensitivity and wide enough frequency band. The high-frequency pulse current sensor detection technology has been relatively mature at present. However, due to the influence of the distance between the winding coils, there are often stray capacitances. The selection of the winding and the winding method of the coil will affect the power transmission efficiency. In addition, the existence of external electromagnetic interference also seriously affects the sensitivity of the high-frequency pulse current sensor.

发明内容SUMMARY OF THE INVENTION

本发明的目的在于针对现有技术中的上述不足，提供一种高灵敏度高频脉冲电流传感器，以解决或改善上述的问题。The purpose of the present invention is to provide a high-sensitivity high-frequency pulse current sensor to solve or improve the above-mentioned problems in view of the above-mentioned deficiencies in the prior art.

为达到上述目的，本发明采取的技术方案是：In order to achieve the above object, the technical scheme that the present invention takes is:

一种高灵敏度高频脉冲电流传感器，其包括：镍锌软磁铁氧体环；镍锌软磁铁氧体环外内嵌一个外围均匀的pvc塑料环；pvc塑料环上均匀开设有若干个镂空槽体；漆包线穿过pvc塑料环上的镂空槽体、并均匀地绕制在镍锌软磁铁氧体上；漆包线绕制形成的绕组线圈外置屏蔽罩；屏蔽罩外设置屏蔽壳进行封装；屏蔽罩和屏蔽壳之间设置的积分电阻与绕组线圈连接。A high-sensitivity high-frequency pulse current sensor comprises: a nickel-zinc soft ferrite ring; a pvc plastic ring with a uniform periphery is embedded in the nickel-zinc soft ferrite ring; a plurality of hollow grooves are evenly opened on the pvc plastic ring The enameled wire passes through the hollow slot body on the pvc plastic ring and is evenly wound on the nickel-zinc soft ferrite; the winding coil formed by winding the enameled wire is provided with an external shielding cover; The integral resistor provided between the cover and the shielding case is connected with the winding coil.

本发明通过在镍锌软磁铁氧体环外加设一个外围均匀内嵌的pvc塑料环、在绕组线圈外置屏蔽罩、且绕组采用双股绕制方式、装置外置屏蔽壳；有效地降低了由于杂散电容、集肤效应以及环境干扰对传感器性能造成的影响，本发明与高压电气设备没有直接的电气接触，安全性能优异，且对电气设备的正常运行无任何影响。In the invention, a pvc plastic ring evenly embedded in the periphery is arranged outside the nickel-zinc soft ferrite ring, a shielding case is arranged outside the winding coil, the winding adopts a double-strand winding method, and an outer shielding case is installed; Due to the influence of stray capacitance, skin effect and environmental interference on sensor performance, the present invention has no direct electrical contact with high-voltage electrical equipment, has excellent safety performance, and has no impact on the normal operation of electrical equipment.

优选地，漆包线绕制形成的绕组线圈采用双股线绕制。Preferably, the winding coil formed by winding the enameled wire is wound with a double-stranded wire.

本发明采用的双股线绕制可有效减小集肤效应的影响，提升高频脉冲电流传感器的灵敏度。The double-stranded wire winding adopted in the present invention can effectively reduce the influence of the skin effect and improve the sensitivity of the high-frequency pulse current sensor.

优选地，双股线中对应每股分别放置于pvc塑料环上相邻的内嵌结构中。Preferably, the corresponding strands of the double-strand wires are respectively placed in adjacent embedded structures on the pvc plastic ring.

本发明可增加导体的表面积，降低线芯交流电阻，使通过绕组线圈的载流量增加，有效减小集肤效应的影响。The invention can increase the surface area of the conductor, reduce the AC resistance of the wire core, increase the current carrying capacity through the winding coil, and effectively reduce the influence of the skin effect.

优选地，屏蔽壳的纵向上均匀切缝。Preferably, the shield shell is uniformly slit in the longitudinal direction.

本发明在屏蔽壳纵向切缝以避免屏蔽层中产生环流。The present invention slits the shielding shell longitudinally to avoid circulating currents in the shielding layer.

优选地，屏蔽罩材料采用高导磁率的良导体。Preferably, the shield material is a good conductor with high magnetic permeability.

本发明采用的屏蔽罩材料使用具有高导磁率的良导体，对厚度无要求，且具有良好的接地，主要实现低频电容性耦合干扰的抑制。The shield material used in the present invention uses good conductors with high magnetic permeability, does not require thickness, and has good grounding, mainly to suppress low-frequency capacitive coupling interference.

优选地，铁氧体环材料采用NX0-100型号，适用中心频率为15MHz。Preferably, the ferrite ring material adopts NX0-100 model, and the applicable center frequency is 15MHz.

本发明磁芯材料采用镍锌软磁铁氧体环，其频带宽，传递阻抗高，起始磁导率低，适用频率范围广且损耗小；铁氧体环材料采用NX0-100型号，适用中心频率为15MHz，相较于其他材料更适合于高频信号的测量。The magnetic core material of the invention adopts nickel-zinc soft ferrite ring, which has wide frequency band, high transmission impedance, low initial permeability, wide applicable frequency range and low loss; the ferrite ring material adopts NX0-100 model, which is suitable for center The frequency is 15MHz, which is more suitable for the measurement of high frequency signals than other materials.

本发明提供的高灵敏度高频脉冲电流传感器，具有以下有益效果：The high-sensitivity high-frequency pulse current sensor provided by the present invention has the following beneficial effects:

本发明适用于对高压电气设备的局部放电在线监测，通过将传感器接在待测设备接地线上，利用电磁感应原理即可在铁氧体环内引起高频交变磁场从而在绕组线圈中产生感应电流；感应电流通过与线圈连接的积分电阻转换为电压信号；且本发明与高压电气设备没有直接的电气接触，安全性能优异。The invention is suitable for on-line monitoring of partial discharge of high-voltage electrical equipment. By connecting the sensor to the ground wire of the equipment to be tested, the electromagnetic induction principle can be used to induce a high-frequency alternating magnetic field in the ferrite ring, thereby generating a high-frequency alternating magnetic field in the winding coil. Induced current; the induced current is converted into a voltage signal through the integral resistance connected with the coil; and the present invention has no direct electrical contact with high-voltage electrical equipment, and has excellent safety performance.

附图说明Description of drawings

图1为高灵敏度高频脉冲电流传感器的原理图。Figure 1 is a schematic diagram of a high-sensitivity high-frequency pulse current sensor.

图2为pvc塑料环俯视图。Figure 2 is a top view of the pvc plastic ring.

其中，101、镍锌软磁铁氧体环；102、漆包线；103、pvc塑料环；104、积分电阻；105、屏蔽壳。Among them, 101, nickel-zinc soft ferrite ring; 102, enameled wire; 103, pvc plastic ring; 104, integral resistance; 105, shielding shell.

具体实施方式Detailed ways

下面对本发明的具体实施方式进行描述，以便于本技术领域的技术人员理解本发明，但应该清楚，本发明不限于具体实施方式的范围，对本技术领域的普通技术人员来讲，只要各种变化在所附的权利要求限定和确定的本发明的精神和范围内，这些变化是显而易见的，一切利用本发明构思的发明创造均在保护之列。The specific embodiments of the present invention are described below to facilitate those skilled in the art to understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes Such changes are obvious within the spirit and scope of the present invention as defined and determined by the appended claims, and all inventions and creations utilizing the inventive concept are within the scope of protection.

根据本申请的一个实施例，参考图1和图2，本方案的高灵敏度高频脉冲电流传感器，包括磁芯，磁芯材料采用镍锌软磁铁氧体环101。According to an embodiment of the present application, referring to FIG. 1 and FIG. 2 , the high-sensitivity high-frequency pulse current sensor of the present solution includes a magnetic core, and the material of the magnetic core is a nickel-zincsoft ferrite ring 101 .

采用镍锌软磁铁氧体环101其频带宽，其传递阻抗高，起始磁导率低，适用频率范围广且损耗小；镍锌软磁铁氧体环101材料采用NX0-100型号，适用中心频率为15MHz，相较于其他材料更适合于高频信号的测量。The nickel-zincsoft ferrite ring 101 is used for its wide frequency band, high transfer impedance, low initial permeability, wide applicable frequency range and low loss; nickel-zincsoft ferrite ring 101 is made of NX0-100 model, suitable for the center The frequency is 15MHz, which is more suitable for the measurement of high frequency signals than other materials.

镍锌软磁铁氧体环101外内嵌一个外围均匀的pvc塑料环103；pvc塑料环103上均匀开设有若干个镂空槽体；漆包线102穿过pvc塑料环103上的镂空槽体、并均匀地绕制在镍锌软磁铁氧体上。The nickel-zincsoft ferrite ring 101 is embedded with a pvcplastic ring 103 with a uniform periphery; several hollow grooves are evenly opened on the pvcplastic ring 103; theenameled wire 102 passes through the hollow grooves on the pvcplastic ring 103, and evenly Ground wound on nickel-zinc soft ferrite.

pvc塑料环103可保证漆包线102能均匀绕制在软磁铁氧体环上，有助于提高线圈对于平行于线圈磁场的抗干扰性能，以减少空间中的杂波干扰。The pvcplastic ring 103 can ensure that theenameled wire 102 can be evenly wound on the soft ferrite ring, which helps to improve the anti-interference performance of the coil to the magnetic field parallel to the coil, so as to reduce the clutter interference in the space.

绕组线圈双股线中对应每股分别放置于pvc塑料环103上相邻的内嵌结构中，保证线圈在减小集肤效应的同时仍能保持均匀绕制，既增加导体表面积，同时，保证对于空间杂波干扰的抗干扰能力。Corresponding strands of the double-strand wires of the winding coil are placed in the adjacent embedded structures on the pvcplastic ring 103 to ensure that the coil can be uniformly wound while reducing the skin effect, which not only increases the conductor surface area, but also ensures Anti-interference ability for space clutter interference.

漆包线102绕制形成的绕组线圈外置屏蔽罩；线圈采用双股线绕制，有效减小了集肤效应的影响，高频脉冲电流传感器灵敏度得以提升；线圈外面加设屏蔽罩，有效减小平行线圈绕组间的杂散电容。The winding coil formed by winding theenameled wire 102 has an external shielding cover; the coil is wound with double-stranded wire, which effectively reduces the influence of the skin effect, and the sensitivity of the high-frequency pulse current sensor is improved; Stray capacitance between parallel coil windings.

屏蔽罩材料使用具有高导磁率的良导体，对厚度无要求，且具有良好的接地，屏蔽罩主要实现低频电容性耦合干扰的抑制。The shield material uses a good conductor with high magnetic permeability, has no requirement for thickness, and has good grounding. The shield mainly realizes the suppression of low-frequency capacitive coupling interference.

屏蔽罩利用电磁波在屏蔽导体表面的反射、导体内部吸收和电磁波在传输过程中的损耗使其传递受到阻碍，从而有效抑制绕组间的杂散电容。The shield uses the reflection of electromagnetic waves on the surface of the shielded conductor, the absorption inside the conductor and the loss of electromagnetic waves in the transmission process to hinder the transmission, thereby effectively suppressing the stray capacitance between the windings.

屏蔽罩外设置屏蔽壳105进行封装，采用屏蔽壳105进行封装，可规避外界杂波对测量信号的干扰；同时，在屏蔽壳105纵向切缝以避免屏蔽层中产生环流。Ashielding case 105 is arranged outside the shielding case for encapsulation, and theshielding case 105 is used for encapsulation, which can avoid the interference of external clutter to the measurement signal; at the same time, longitudinal slits are made in theshielding case 105 to avoid circulating current in the shielding layer.

屏蔽罩和屏蔽壳105之间设置的积分电阻104与绕组线圈连接，绕组线圈感应电流通过与线圈连接的积分电阻104转换为电压信号。The integratingresistor 104 disposed between the shielding case and theshielding shell 105 is connected to the winding coil, and the induced current of the winding coil is converted into a voltage signal through the integratingresistor 104 connected to the coil.

当接地线上的高频脉冲电流通过镍锌软磁铁氧体环101时，利用电磁感应原理即可在铁氧体环内引起高频交变磁场，从而在绕组线圈中产生感应电流，感应电流通过与线圈连接的积分电阻104转换为电压信号。When the high-frequency pulse current on the ground wire passes through the nickel-zincsoft ferrite ring 101, a high-frequency alternating magnetic field can be induced in the ferrite ring by using the principle of electromagnetic induction, thereby generating an induced current in the winding coil, and the induced current It is converted into a voltage signal by an integratingresistor 104 connected to the coil.

本发明通过在铁氧体环外围加设一个结构均匀内嵌的pvc塑料环103、在线圈外置屏蔽罩、绕组采用双股间绕制方式、装置外置屏蔽壳105；本发明可有效降低由于杂散电容、集肤效应以及环境干扰对传感器性能造成的影响，同时提高高频脉冲电流传感器的灵敏度。In the present invention, a pvcplastic ring 103 with a uniform structure embedded in the periphery of the ferrite ring is added, a shielding cover is placed outside the coil, the winding is wound in a double-strand, and anexternal shielding shell 105 is installed; the present invention can effectively reduce the Due to the influence of stray capacitance, skin effect and environmental interference on sensor performance, the sensitivity of high frequency pulse current sensor is improved.

本发明适用于对高压电气设备的局部放电在线监测，通过将传感器接在待测设备接地线上，利用电磁感应原理即可在铁氧体环内引起高频交变磁场从而在绕组线圈中产生感应电流；感应电流通过与线圈连接的积分电阻104转换为电压信号，该发明与高压电气设备没有直接的电气接触，安全性能优异。The invention is suitable for on-line monitoring of partial discharge of high-voltage electrical equipment. By connecting the sensor to the ground wire of the equipment to be tested, the electromagnetic induction principle can be used to induce a high-frequency alternating magnetic field in the ferrite ring, thereby generating a high-frequency alternating magnetic field in the winding coil. Induced current: The induced current is converted into a voltage signal through the integratingresistor 104 connected to the coil, the invention has no direct electrical contact with high-voltage electrical equipment, and has excellent safety performance.

虽然结合附图对发明的具体实施方式进行了详细地描述，但不应理解为对本专利的保护范围的限定。在权利要求书所描述的范围内，本领域技术人员不经创造性劳动即可做出的各种修改和变形仍属本专利的保护范围。Although the specific embodiments of the invention have been described in detail with reference to the accompanying drawings, they should not be construed as limiting the protection scope of this patent. Within the scope described in the claims, various modifications and deformations that can be made by those skilled in the art without creative work still belong to the protection scope of this patent.

Claims (6)

Translated fromChinese

1.一种高灵敏度高频脉冲电流传感器，其特征在于：包括镍锌软磁铁氧体环；所述镍锌软磁铁氧体环外内嵌一个外围均匀的pvc塑料环；所述pvc塑料环上均匀开设有若干个镂空槽体；漆包线穿过pvc塑料环上的镂空槽体、并均匀地绕制在镍锌软磁铁氧体上；所述漆包线绕制形成的绕组线圈外置屏蔽罩；所述屏蔽罩外设置屏蔽壳进行封装；所述屏蔽罩和屏蔽壳之间设置的积分电阻与绕组线圈连接。1. a high-sensitivity high-frequency pulse current sensor is characterized in that: comprise a nickel-zinc soft ferrite ring; the nickel-zinc soft ferrite ring is embedded with a peripheral uniform pvc plastic ring; the pvc plastic ring A number of hollow groove bodies are evenly opened on the upper part; the enameled wire passes through the hollow groove body on the pvc plastic ring and is evenly wound on the nickel-zinc soft ferrite; the winding coil formed by the enameled wire is wound with an external shield; A shielding case is arranged outside the shielding cover for encapsulation; an integral resistor arranged between the shielding cover and the shielding case is connected with the winding coil.2.根据权利要求1所述的高灵敏度高频脉冲电流传感器，其特征在于：所述漆包线绕制形成的绕组线圈采用双股线绕制。2 . The high-sensitivity high-frequency pulse current sensor according to claim 1 , wherein the winding coil formed by winding the enameled wire is wound with a double-stranded wire. 3 .3.根据权利要求2所述的高灵敏度高频脉冲电流传感器，其特征在于：所述双股线中对应每股分别放置于pvc塑料环上相邻的内嵌结构中。3 . The high-sensitivity high-frequency pulse current sensor according to claim 2 , wherein the corresponding strands of the double-stranded wires are respectively placed in adjacent embedded structures on the pvc plastic ring. 4 .4.根据权利要求1所述的高灵敏度高频脉冲电流传感器，其特征在于：所述屏蔽壳的纵向上均匀切缝。4 . The high-sensitivity high-frequency pulse current sensor according to claim 1 , wherein the shielding case is uniformly slit in the longitudinal direction. 5 .5.根据权利要求1所述的高灵敏度高频脉冲电流传感器，其特征在于：所述屏蔽罩材料采用高导磁率的良导体。5 . The high-sensitivity high-frequency pulse current sensor according to claim 1 , wherein the shield material is a good conductor with high magnetic permeability. 6 .6.根据权利要求1所述的高灵敏度高频脉冲电流传感器，其特征在于：所述铁氧体环材料采用NX0-100型号，适用中心频率为15MHz。6 . The high-sensitivity high-frequency pulse current sensor according to claim 1 , wherein the ferrite ring material adopts the NX0-100 model, and the applicable center frequency is 15MHz. 7 .

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