CN112557855A - On-line partial discharge shielding type sensor and implementation method thereof - Google Patents
On-line partial discharge shielding type sensor and implementation method thereof Download PDFInfo
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- 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
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Abstract
The invention discloses an on-line partial discharge shielding type sensor and an implementation method thereof, wherein the sensor comprises a capacitive sensor body and a semi-open shielding structure; the semi-open shielding structure comprises a first shielding piece and a second shielding piece; the first shielding part and the second shielding part are fixedly connected at one end, and the other end is movably connected; the first shielding piece comprises a first outer supporting layer, a first waterproof layer, a first shielding layer and a first inner supporting layer which are sequentially arranged from outside to inside; the second shielding part comprises a second outer supporting layer, a second waterproof layer, a second shielding layer and a second inner supporting layer which are sequentially arranged from outside to inside; the first shielding layer and the second shielding layer are connected through a sealing structure to form a closed cavity, and the capacitive sensor body is arranged in the closed cavity and surrounds the outer side of the cable outer sheath. According to the invention, the two shielding parts form a closed shielding cavity through the matching of the shielding layer and the sealing structure, so that the partial discharge interference signal is effectively shielded.
Description
Technical Field
The invention relates to the technical field of partial discharge detection, in particular to an online partial discharge shielding type sensor and an implementation method thereof.
Background
Along with the development of science and technology, industrial fields and power transmission and distribution of power systems are developed towards automation and intellectualization, the modern power system has larger and larger transmission capacity and continuously improved power supply voltage grade, different requirements from the prior are provided for a measuring device, the requirements on accuracy and applicability are continuously expanded, and the traditional metering, protecting and monitoring sensors are difficult to meet engineering requirements. The partial discharge detection technology of the power cable is a well-known effective technology for discovering the hidden danger of partial insulation of cable equipment and providing intervention for life management before the cable breaks down. The on-line partial discharge monitoring system can monitor the insulation state of the cable in real time for a long time and is more and more applied to operation and maintenance monitoring of the cable. Different from portable partial discharge detection, the online partial discharge monitoring system has no environmental sensor, and analyzes the acquisition result of a single partial discharge signal acquisition sensor, so that the requirement on screening and processing of the information acquired by the sensor is higher. And the sensor is installed on the cable body for a long time, and the environment of being in is mostly tunnel, open air etc. has humidity, dirty indiscriminate inevitable, and a long time can cause the influence to the accuracy and the sensitivity of sensor.
The partial discharge mechanism is complex, the discharge duration is generally between 10 < -9 > to 10 < -7 > s, the partial discharge mechanism is a non-periodic wave, the pulse width is ns level, the corresponding frequency domain is very wide and can reach 1GHz, and the influence of field noise is large. The interference can be classified into three categories of periodic narrow-band interference, white noise and pulse type interference according to time domain characteristics, wherein the white noise interference comprises various random noises such as winding thermal noise, ground screen noise, thermal noise of a measuring instrument and the like. Because the spectrum of white noise is similar to the spectrum of the partial discharge signal, it is difficult to filter the white noise by the conventional fourier analysis method.
The change of the partial discharge amount of the high-voltage cable joint can reflect the condition of the insulation condition of the high-voltage cable, and the damage degree of the cable insulation is reflected by the size of the partial discharge amount. However, the partial discharge pulse has a wide frequency band, a short time, and a small initial discharge amount, and thus is easily disturbed. Since the partial discharge signal is weak, the sensor is required to have high sensitivity and good frequency response characteristics. The form, arrangement mode, sensitivity and anti-interference capability of the sensor are very important for improving the accuracy of the partial discharge detection technology. The interference signal sources in the partial discharge detection process mainly include electromagnetic signals emitted by surrounding electric equipment, interference in the environment and interference entering the detection system through the sensor. Therefore, the accuracy of the partial discharge detection is greatly increased by removing the surrounding electric equipment and other interference in the environment.
The capacitance type broadband sensor carries out partial discharge detection on the cable body, has the advantages of not influencing the internal electric field of the whole circuit and being convenient to install, has poor anti-interference capability and is easy to be influenced by external interference signals, and influences the sensitivity of the sensor. A shielding body capable of effectively shielding the outside stray electromagnetic field is required outside the capacitive sensor. The shielding structure is combined with an effective digital signal processing method, so that the interference of external signals is eliminated, the sensor only captures the discharge signals in the cable accurately, and the detection sensitivity of the partial discharge detection technology is improved. In order to be able to adapt to the detection requirement of the partial discharge signal well and to be suitable for various cables, the sensor should have the characteristics of small volume, convenient movement and arrangement, and it should also have higher detection sensitivity.
The shielding principle of the shielding structure is to shunt the magnetic field by using the high magnetic permeability of the ferromagnetic material. The magnetic permeability of the magnetic shielding material is higher and is 1 to 3 orders of magnitude higher than that of air. This means that most of the magnetic flux lines penetrate the magnetic shield structure and are absorbed by the shield cavity, and only a small fraction of the magnetic flux lines reach the shielded core. The shielding effect is related to the material selection and the size of the shielding structure, and when the magnetic permeability of the shielding structure is higher or the wall layer is thicker, the magnetic shunt effect is more obvious and the shielding efficiency is better.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the on-line partial discharge shielding type sensor and the implementation method thereof.
According to an aspect of the present disclosure, an online partial discharge shielding sensor is provided, which includes a capacitive sensor body and a semi-open shielding structure; the semi-open shielding structure comprises a first shielding piece and a second shielding piece; the first shielding part and the second shielding part are fixedly connected at one end, and the other end is movably connected; the first shielding piece comprises a first outer supporting layer, a first waterproof layer, a first shielding layer and a first inner supporting layer which are sequentially arranged from outside to inside; the second shielding part comprises a second outer supporting layer, a second waterproof layer, a second shielding layer and a second inner supporting layer which are sequentially arranged from outside to inside; the first shielding layer and the second shielding layer are connected through a sealing structure to form a closed cavity, and the capacitive sensor body is arranged in the closed cavity and surrounds the outer side of the cable outer sheath.
In the technical scheme, the first shielding part and the second shielding part form a semi-open shielding structure in a mode that one end of the first shielding part is fixed and the other end of the first shielding part is movable; a closed shielding cavity is formed between the two shielding pieces through the matching of the shielding layer and the sealing structure, so that the partial discharge interference signal is effectively shielded; wherein, shielding structure comprises multilayer structure, wraps the cable body through interior supporting layer, forms sealed shielding chamber through the shielding layer, guarantees the long-time steady operation of sensor and shielding layer through the waterproof layer, supports whole shielding structure through outer supporting layer, and multilayer structure integration sets up the loading and unloading of being convenient for.
As a further technical scheme, first outer convex portions are respectively formed at two ends of the first outer supporting layer, first inner convex portions are respectively formed at two ends of the first inner supporting layer, and a first arc-shaped groove is formed between the first outer convex portions and the first inner convex portions; second outer convex parts are formed at two ends of the second outer supporting layer respectively, second inner convex parts are formed at two ends of the second inner supporting layer respectively, and second arc-shaped grooves are formed between the second outer convex parts and the second inner convex parts; the first arc-shaped groove is matched with the second arc-shaped groove.
Through the arc recess that forms between outer bellying and the interior bellying, can be used to place flexible conducting material for the junction of first shielding piece and second shielding piece can sealing connection, and then forms confined shielding cavity. The shielding effect can be enhanced by the arrangement, and the poor shielding effect caused by the untight sealing of the joint between the two shielding parts is avoided.
As a further technical scheme, the first shielding layer and the second shielding layer both comprise metal shielding cloth and a sealing structure fixed at one end of the metal shielding cloth; the metal shielding cloth is coated on the periphery of the inner supporting layer, and the sealing structure is accommodated in the arc-shaped groove. The sealing structure can be a flexible cylindrical conductor, the size of the flexible cylindrical conductor is matched with the arc-shaped groove and can be placed in the arc-shaped groove, and when the movable ends of the two shielding parts are closed, the shielding layers in the two shielding parts can be tightly connected through the extrusion sealing structure, so that a closed shielding cavity is formed.
As a further technical scheme, the inner surfaces of the first arc-shaped groove and the second arc-shaped groove are coated with metal shielding cloth. The arrangement can avoid poor shielding effect caused by the gap of the arc-shaped groove.
As a further technical scheme, the first shielding layer and the second shielding layer are formed by overlapping a plurality of layers of metal shielding cloth, and conductive adhesive is coated between each layer of metal shielding cloth. The metal shielding cloth is composed of metal fibers of 100% of nano-grade materials such as metal copper, nickel and the like, has a good electromagnetic wave resistance function, and has a shielding effect by reflecting and absorbing electromagnetic waves. The single-component conductive adhesive prepared from the high polymer material has good conductivity and operation performance. Has better bonding effect with materials such as metal, nonmetal, plastic and the like, and forms a good conductive channel.
As a further technical scheme, the first shielding layer and the second shielding layer are formed by overlapping 3 layers of metal shielding cloth, and conductive adhesive is uniformly coated in the middle of each layer.
As a further technical scheme, the first inner supporting layer, the second inner supporting layer and the sealing structure are all made of flexible conductive materials; the first waterproof layer and the second waterproof layer are both made of insulating rubber. The inner supporting layer is made of flexible conductive materials, and can be tightly attached to the cable by utilizing the characteristics of easy deformation and conductivity of the inner supporting layer to form a complete shielding cavity. The waterproof layer is composed of insulating rubber, can resist wear and skid, resist oil and temperature, prevent corrosion and water, and fully ensure long-time stable and reliable operation of the sensor and the shielding layer.
As a further technical scheme, the first outer supporting layer and the second outer supporting layer are used for customizing a PVC mould according to the cable grade model; the inner supporting layer, the shielding layer, the waterproof layer and the outer supporting layer are tightly attached to form an integrated structure.
According to an aspect of the present disclosure, there is provided an implementation method of an online partial discharge shielded sensor, which is implemented by using the sensor, including: when the partial discharge signal is transmitted in a main line and generates electromagnetic disturbance, an induction signal is also generated in the other parallel transmission line; the capacitive sensor realizes signal conversion through parameter change in the capacitor, the sensor surrounds the outer side of the outer sheath of the cable, is tightly attached to the surface of the cable and serves as one electrode of the capacitor, the metal sheath of the cable serves as the other electrode of the capacitor, and partial discharge signals in the cable are coupled by utilizing the formed capacitor.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a special shielding structure for a capacitive partial discharge acquisition sensor, adopts a multilayer high-density metal shielding net and conductive adhesive polymerization, effectively shields pulse high-frequency signals of similar partial discharge, has good shielding effect on partial discharge interference signals with specific frequency, and improves the accuracy of partial discharge detection; and the material is simple, the manufacturing cost is cheap, and the shielding effect is good.
(2) The invention adopts a semi-open type shielding structure for installation, and has the advantages of compact structure, strong stability, safety and reliability. The problem that the relative position of parts has errors with a theoretical model due to manual installation can be avoided by the integrated arrangement, and the problem that due to the fact that the adhesive tape loses viscosity due to long installation time and needs to be fixed again, the front and rear partial discharge test data are greatly inconsistent is also avoided; in addition, when the shielding structure is deformed and broken, the data collected by the partial discharge sensor cannot be influenced, and the safety of the cable in operation is not influenced.
Drawings
Fig. 1 is a schematic structural diagram of an on-line partial discharge shielded sensor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an on-line partial discharge shielded sensor after installation in accordance with an embodiment of the present invention;
fig. 3 is a cross-sectional view of an in-line partial discharge shielded sensor according to an embodiment of the invention.
In the figure: 1. a first shield; 101. a first outer support layer; 1011. a first outer boss; 1012. a second outer lobe; 102. a first waterproof layer; 103. a first shielding layer; 1031. a sealing structure; 104. a first inner support layer; 1041. a first inner boss; 1042. a second inner boss; 2. a second shield; 201. a second outer support layer; 202. a second waterproof layer; 203. a second shielding layer; 204. a second inner support layer; 3. a cable; 4. a capacitive sensor body; 5. and (5) leading out sensor data.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
According to an aspect of the present disclosure, an online partial discharge shielding sensor is provided, which includes a capacitive sensor body 4 and a semi-open shielding structure; as shown in fig. 1, the half-open type shielding structure includes a first shield 1 and a second shield 2; the first shielding part 1 and the second shielding part 2 are fixedly connected at one end, and the other ends are movably connected; the first shielding part 1 comprises a first outer supporting layer 101, a first waterproof layer 102, a first shielding layer 103 and a first inner supporting layer 104 which are sequentially arranged from outside to inside; the second shielding part 2 comprises a second outer supporting layer 201, a second waterproof layer 202, a second shielding layer 203 and a second inner supporting layer 204 which are arranged from outside to inside in sequence; the first shielding layer 103 and the second shielding layer 203 are connected through a sealing structure 1031 to form a closed cavity, and the capacitive sensor body 4 is arranged in the closed cavity and surrounds the outer side of the outer sheath of the cable 3.
The first shielding part 1 and the second shielding part 2 form a semi-open type shielding structure in a mode that one end is fixed and the other end is movable; a closed shielding cavity is formed between the two shielding pieces through the matching of the shielding layer and the sealing structure 1031, so that the partial discharge interference signals are effectively shielded; wherein, shielding structure comprises multilayer structure, wraps the 3 bodies of cable through interior supporting layer, forms sealed shielding chamber through the shielding layer, guarantees the long-time steady operation of sensor and shielding layer through the waterproof layer, supports whole shielding structure through outer supporting layer, and multilayer structure integration sets up, the loading and unloading of being convenient for.
In order to achieve a better shielding effect, a closed cavity is formed by the first shielding layer 103, the second shielding layer 203 and the sealing structure 1031, and in order to make the connection part of the first shielding layer 103 and the second shielding layer 203 have better sealing performance, the inner and outer supporting layers are arranged to form an arc-shaped groove to accommodate the sealing structure 1031 fixed at the end part of the shielding layers, so that a closed shielding cavity can be formed by the extrusion of the sealing structure 1031 when the first shielding layer 103 and the second shielding layer 203 are fixedly connected. Specifically, first outer protrusions 1011 are formed at two ends of the first outer support layer 101, first inner protrusions 1041 are formed at two ends of the first inner support layer 104, and a first arc-shaped groove is formed between the first outer protrusion 1011 and the first inner protrusion 1041; second outer protrusions 1012 are respectively formed at two ends of the second outer support layer 201, second inner protrusions 1042 are respectively formed at two ends of the second inner support layer 204, and a second arc-shaped groove is formed between the second outer protrusions 1012 and the second inner protrusions 1042; the first arc-shaped groove is matched with the second arc-shaped groove.
Through the arc recess that forms between outer bulge and the interior bulge, can be used to place flexible conducting material and make seal structure 1031 for the junction of first shield 1 and second shield 2 can sealing connection, and then forms confined shielding cavity. The shielding effect can be enhanced by the arrangement, and the poor shielding effect caused by the untight sealing of the joint between the two shielding parts is avoided.
The first shielding layer 103 and the second shielding layer 203 both comprise a metal shielding cloth and a sealing structure 1031 fixed at one end of the metal shielding cloth; the metal shielding cloth is wrapped on the periphery of the inner supporting layer, and the sealing structure 1031 is accommodated in the arc-shaped groove. Sealing structure 1031 can be flexible cylindricality electric conductor, and its size and arc recess phase-match can place in the arc recess to when the expansion end of two shields was closed, can make the shielding layer in two shields closely link to each other through extrusion sealing structure 1031, formed confined shielding cavity.
In order to further improve the shielding effect of the shielding layer, the inner surfaces of the first arc-shaped groove and the second arc-shaped groove are coated with metal shielding cloth, so that poor shielding effect caused by gaps of the arc-shaped grooves is avoided.
The first shielding layer 103 and the second shielding layer 203 are formed by overlapping multiple layers of metal shielding cloth, and conductive adhesive is coated between each layer of metal shielding cloth. The metal shielding cloth is composed of metal fibers of 100% of nano-grade materials such as metal copper, nickel and the like, has a good electromagnetic wave resistance function, and has a shielding effect by reflecting and absorbing electromagnetic waves. The single-component conductive adhesive prepared from the high polymer material has good conductivity and operation performance. Has better bonding effect with materials such as metal, nonmetal, plastic and the like, and forms a good conductive channel. Preferably, the first shielding layer 103 and the second shielding layer 203 are formed by overlapping 3 layers of metal shielding cloth, and the middle of each layer is uniformly coated with conductive adhesive.
The first inner support layer 104, the second inner support layer 204 and the sealing structure 1031 are all made of flexible conductive materials; the first waterproof layer 102 and the second waterproof layer 202 are both made of insulating rubber. The inner supporting layer is made of flexible conductive materials, and can be tightly attached to the cable 3 by utilizing the characteristics of easy deformation and conductivity of the inner supporting layer to form a complete shielding cavity. The waterproof layer is composed of insulating rubber, can resist wear and skid, resist oil and temperature, prevent corrosion and water, and fully ensure long-time stable and reliable operation of the sensor and the shielding layer.
The first outer supporting layer 101 and the second outer supporting layer 201 are used for customizing PVC moulds according to the 3-grade model of the cable; the inner supporting layer, the shielding layer, the waterproof layer and the outer supporting layer are tightly attached to form an integrated structure.
According to an aspect of the present disclosure, there is provided an implementation method of an online partial discharge shielded sensor, which is implemented by using the sensor, including: when the partial discharge signal is transmitted in a main line and generates electromagnetic disturbance, an induction signal is also generated in the other parallel transmission line; the capacitive sensor realizes signal conversion through parameter change in the capacitor, the sensor surrounds the outer side of the outer sheath of the cable 3, is tightly attached to the surface of the cable 3 and serves as one electrode of the capacitor, the metal sheath of the cable 3 serves as the other electrode of the capacitor, and partial discharge signals in the cable 3 are coupled by utilizing the formed capacitor.
Examples
As shown in fig. 2 to 3, the present embodiment provides an online partial discharge shielding sensor, which includes a capacitive partial discharge sensor and a semi-open shielding structure. The semi-open type shielding structure is characterized in that the basic physical structure of the shielding structure comprises four layers including an inner supporting layer, a shielding layer, a waterproof layer and an outer supporting layer, and the whole shielding structure is formed by alternately laying a plurality of ferromagnetic layers and non-ferromagnetic layers. The shielding layer comprises a metal shielding cloth and a sealing structure 1031, and the shielding layer forms a passage inside the interface of the shielding structure through the sealing structure 1031 to establish a complete shielding cavity.
This embodiment removes 3 body external noise of cable at capacitive sensor outside installation half open-close type shielding structure, and it utilizes the electromagnetic shielding technique, and the electromagnetic wave of transmission coming outside 3 bodies of shielded cable gets rid of the type office and puts signal interference, adopts multilayer shielding net to protect capacitive sensor and avoids interfering to use conducting resin between the shielding net, make the laminating of shielding net inseparable, reinforcing shielding efficiency.
The inner supporting layer and the sealing structure 1031 of the semi-open type shielding structure are made of flexible conductive materials, have the characteristics of easy deformation and conductivity, and can be tightly attached to the cable 3 to form a complete shielding cavity.
The shielding layer of the semi-open type shielding structure is metal shielding gauze which is composed of metal fibers made of nano-grade materials such as 100% of metal copper, nickel and the like, has a good electromagnetic wave resistance function, and plays a shielding role by reflecting and absorbing electromagnetic waves. The shielding frequency range is 10MHz-30GHz, and the range of partial discharge signals is covered. The shielding layers are overlapped by a plurality of layers of metal shielding nets, and conductive adhesive is coated between every two layers. The single-component conductive adhesive prepared from the high polymer material has good conductivity and operation performance. Has better bonding effect with materials such as metal, nonmetal, plastic and the like, and forms a good conductive channel. For better shielding effect, the metal shielding cloth of the shielding layer can be folded into 3 layers, and conductive adhesive is uniformly coated in the middle of each layer to enhance the shielding effect.
The waterproof layer of the semi-open-close type shielding structure is made of insulating rubber, so that the semi-open-close type shielding structure is wear-resistant, anti-slip, oil-resistant, temperature-resistant, corrosion-resistant and waterproof, and long-time stable and reliable operation of the sensor and the shielding layer is fully guaranteed.
The outer supporting layer of the semi-open type shielding structure is a PVC (polyvinyl chloride) die customized according to the 3-grade model of the cable, and is suitable for partial discharge testing of the cable 3 without the voltage grade. The outer supporting layer is externally provided with a lock catch, so that the semi-open type shielding structure can be tightly attached at the interface.
The four layers of physical structures of the shielding structure are tightly attached and fixed in the outer supporting layer to form an integrated structure. When the on-line partial discharge sensor is installed, firstly, the capacitive sensor 4 is installed on the cable 3 body, then, the shielding structure is installed at the installation position of the sensor 4, and the shielding structure is tightly closed at the joint to form a complete shielding space. The sensor data outgoing line 5 is connected out from the joint of the two shielding parts, and due to the flexible characteristic of the sealing structure, the data outgoing line 5 can be tightly attached to the joint without generating gaps when a sealing cavity is formed.
As an embodiment, the method for detecting the partial discharge signal by the capacitive sensor is as follows: when the partial discharge signal is transmitted in the main line and generates electromagnetic disturbance, an induction signal is also generated in the other parallel transmission line. The capacitive sensor realizes signal conversion through parameter change in the capacitor, the sensor surrounds the outer side of the outer sheath of the cable 3, is tightly attached to the surface of the cable 3 and serves as one electrode of the capacitor, the metal sheath of the cable 3 serves as the other electrode of the capacitor, and partial discharge signals in the cable 3 are coupled by utilizing the formed capacitor.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.
Claims (9)
1. The on-line partial discharge shielding type sensor is characterized by comprising a capacitive sensor body and a semi-open shielding structure; the semi-open shielding structure comprises a first shielding piece and a second shielding piece; the first shielding part and the second shielding part are fixedly connected at one end, and the other end is movably connected; the first shielding piece comprises a first outer supporting layer, a first waterproof layer, a first shielding layer and a first inner supporting layer which are sequentially arranged from outside to inside; the second shielding part comprises a second outer supporting layer, a second waterproof layer, a second shielding layer and a second inner supporting layer which are sequentially arranged from outside to inside; the first shielding layer and the second shielding layer are connected through a sealing structure to form a closed cavity, and the capacitive sensor body is arranged in the closed cavity and surrounds the outer side of the cable outer sheath.
2. The on-line partial discharge shielded sensor according to claim 1, wherein first outer protrusions are formed at two ends of the first outer support layer, first inner protrusions are formed at two ends of the first inner support layer, and a first arc-shaped groove is formed between the first outer protrusions and the first inner protrusions; second outer convex parts are formed at two ends of the second outer supporting layer respectively, second inner convex parts are formed at two ends of the second inner supporting layer respectively, and second arc-shaped grooves are formed between the second outer convex parts and the second inner convex parts; the first arc-shaped groove is matched with the second arc-shaped groove.
3. The on-line partial discharge shielded sensor according to claim 2, wherein the first shielding layer and the second shielding layer each comprise a metal shielding cloth and a sealing structure fixed at one end of the metal shielding cloth; the metal shielding cloth is coated on the periphery of the inner supporting layer, and the sealing structure is accommodated in the arc-shaped groove.
4. The on-line partial discharge shielded sensor according to claim 3, wherein the inner surfaces of the first arc-shaped groove and the second arc-shaped groove are coated with metal shielding cloth.
5. The on-line partial discharge shielded sensor according to claim 1, wherein the first and second shielding layers are formed by overlapping a plurality of metal shielding cloths, and a conductive adhesive is coated between each metal shielding cloth.
6. The on-line partial discharge shielded sensor according to claim 5, wherein the first shielding layer and the second shielding layer are formed by overlapping 3 layers of metal shielding cloth, and a conductive adhesive is uniformly coated in the middle of each layer.
7. The on-line partial discharge shielded sensor of claim 1, wherein the first inner support layer, the second inner support layer and the sealing structure are all flexible conductive materials; the first waterproof layer and the second waterproof layer are both made of insulating rubber.
8. The on-line partial discharge shielded sensor according to claim 1, wherein the first outer support layer and the second outer support layer are made of a customized PVC mold according to a cable grade model; the inner supporting layer, the shielding layer, the waterproof layer and the outer supporting layer are tightly attached to form an integrated structure.
9. An implementation method of an online partial discharge shielding type sensor, which is implemented by the sensor of any one of claims 1 to 8, is characterized by comprising the following steps: when the partial discharge signal is transmitted in a main line and generates electromagnetic disturbance, an induction signal is also generated in the other parallel transmission line; the capacitive sensor realizes signal conversion through parameter change in the capacitor, the sensor surrounds the outer side of the outer sheath of the cable, is tightly attached to the surface of the cable and serves as one electrode of the capacitor, the metal sheath of the cable serves as the other electrode of the capacitor, and partial discharge signals in the cable are coupled by utilizing the formed capacitor.
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| CN202011536188.3A CN112557855A (en) | 2020-12-23 | 2020-12-23 | On-line partial discharge shielding type sensor and implementation method thereof |
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| CN202011536188.3A CN112557855A (en) | 2020-12-23 | 2020-12-23 | On-line partial discharge shielding type sensor and implementation method thereof |
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Cited By (1)
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