CN108535609B - PCB antenna and external acoustic-electric composite sensor for GIS insulation defect detection - Google Patents
PCB antenna and external acoustic-electric composite sensor for GIS insulation defect detection Download PDFInfo
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- CN108535609B CN108535609B CN201810179800.2A CN201810179800A CN108535609B CN 108535609 B CN108535609 B CN 108535609B CN 201810179800 A CN201810179800 A CN 201810179800A CN 108535609 B CN108535609 B CN 108535609B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
Abstract
The application discloses a PCB antenna, which comprises a substrate and an antenna arranged on the surface of the substrate, wherein the substrate is provided with a first surface and a second surface which are respectively positioned on two side surfaces of the substrate, the first surface is provided with a first circular ring antenna and a second circular ring antenna which are connected in parallel, the second surface is provided with a third circular ring antenna and a fourth circular ring antenna which are connected in series, and the fourth circular ring antenna is provided with an inner concave part which is concave inwards. In addition, the application also discloses an external sound-electricity composite sensor for GIS insulation defect detection, which comprises the following components: the PCB antenna comprises a metal shell, a metal cover plate, the PCB antenna, a contact type ultrasonic sensor, a first cable, a second cable, a first metal cable pressing seat and a second metal cable pressing seat. The PCB antenna comprises two different detection main frequency bands by adopting the different-surface structure, so that the PCB antenna is suitable for detecting different discharge signals.
Description
Technical Field
The present application relates to an antenna and a sensor including the same, and more particularly, to an antenna that can be used for insulation defect detection and a sensor including the same.
Background
With the continuous development of national economy and the continuous increase of the scale of the power system in China, the requirements on the safety and reliability of the operation of the power grid are increasingly improved. The safe operation of the power grid mainly depends on the safe operation of high-voltage electrical equipment, and the operational reliability of the electrical equipment depends to a large extent on the quality of manufacturing and installation of the electrical equipment, as well as on overhaul, operational maintenance, necessary preventive tests and the like of the equipment.
Gas-Insulated-switching Gear (GIS) has been widely used in power grids due to its advantages of high reliability, small occupied area, simple maintenance, long maintenance period, etc. Research shows that some accidental factors in the GIS equipment design, manufacture, transportation and installation process can cause some congenital local defects, such as bubbles, cracks, suspended conductive particles, burrs and the like. These defects can cause the electric field strength of certain areas of the GIS equipment to be too high, and partial discharge can occur when the electric field strength is higher than the breakdown field strength of the insulating medium. Partial discharge is not only a characteristic quantity representing the insulation condition of GIS equipment, but also a main cause of insulation degradation. Through partial discharge detection, the insulation defect existing in the GIS equipment can be found in time, sudden insulation breakdown accidents of the equipment are avoided, and the method has very important significance for guaranteeing safe and stable operation of the GIS equipment and a power grid.
The partial discharge detection method generally includes: pulse current method, ultrasonic method, chemical detection method, optical detection method, and ultrahigh frequency (Ultra High Frequency) method. The ultrahigh frequency method and the ultrasonic method are electrified detection methods mainly adopted by the field GIS equipment at present. The ultra-high frequency (UHF) method has become a main means for GIS equipment partial discharge detection in recent years due to the advantages of high sensitivity, large coverage area, strong anti-interference capability and the like. The sound signal detected by the ultrasonic method is not influenced by electromagnetic interference, has obvious advantages in the aspect of anti-interference, and has obvious advantages in the aspect of accurate positioning due to the slow propagation speed of ultrasonic waves.
If the ultra-high frequency detection method and the ultrasonic detection method can be combined, the reliability of the on-site live detection result and the positioning accuracy can be greatly improved. However, considering that the ultra-high frequency and ultrasonic signals are combined together, the ultra-high frequency signal and the ultrasonic signal need to be detected simultaneously, that is to say, an ultra-high frequency sensor and an ultrasonic sensor are used simultaneously, the installation and the use are very inconvenient, two sets of completely different systems are involved, the signal synchronization is difficult, and the combined positioning of the acoustic and electric signals is unfavorable. Based on the above, it is desirable to obtain an external acousto-electric composite sensor for GIS partial discharge live detection.
Disclosure of Invention
One of the purposes of the present application is to provide a PCB antenna, which uses a different-sided structure, so that the PCB antenna includes two different main detection frequency bands, so as to be suitable for detecting different discharge signals.
In view of the above-mentioned objects, the present application provides a PCB antenna, which includes a substrate and an antenna disposed on a surface of the substrate, wherein the substrate has a first surface and a second surface disposed on two sides thereof, respectively, the first surface is provided with a first loop antenna and a second loop antenna connected in parallel, and the second surface is provided with a third loop antenna and a fourth loop antenna connected in series, wherein the fourth loop antenna has an inner concave portion recessed therein.
For the PCB antenna, the different-surface structure is designed so that the PCB antenna comprises two different detection main channels, so that the PCB antenna is suitable for detecting different discharge signals. Specifically, a first loop antenna and a second loop antenna connected in parallel are provided on the first surface, which can be used to detect a higher frequency portion, such as 1.3-1.5GHz, in the discharge signal, and a third loop antenna and a fourth loop antenna connected in series are provided on the second surface, wherein the fourth loop antenna has an inner recess recessed inward thereof, which is provided for improvement by symmetrical bending, thereby increasing the effective length of the antenna to reduce the resonance frequency. In addition, the second surfaces of the third circular ring antenna and the fourth circular ring antenna are positioned on different planes with the first surfaces of the first circular ring antenna and the second circular ring antenna, so that the resonance frequencies are also different, and the second surfaces can be used for detecting lower frequency parts in discharge signals, such as 400-600MHz.
Further, in the PCB antenna of the present application, the diameters of the first loop antenna and the second loop antenna are the same, and the resonant frequencies of the first loop antenna and the second loop antenna are the same.
In the above scheme, the diameters of the first circular ring antenna and the second circular ring antenna are the same, and the resonant frequencies of the first circular ring antenna and the second circular ring antenna are the same, so that the coupled energy is increased, and the detection of the part with higher frequency in the discharge signal is facilitated.
Further, in the PCB antenna of the present application, the fourth loop antenna has at least one pair of the concave portions symmetrically disposed opposite to each other.
Further, in the PCB antenna of the present application, the substrate is an epoxy resin board.
Correspondingly, the application further aims to provide an external acousto-electric composite sensor for GIS insulation defect detection, and the external acousto-electric composite sensor can be used for effectively combining an ultrahigh frequency detection method with an ultrasonic detection method, so that the reliability of a site belt point detection structure and the positioning accuracy are improved.
Based on the above object, the present application provides an external acoustic-electric composite sensor for detecting GIS insulation defects, comprising:
the cable connector comprises a metal shell, wherein a partition plate is arranged in the metal shell to divide the interior of the metal shell into a first space and a second space, a cable hole is formed in the partition plate, and a first connector and a second connector are arranged on the wall of the first space;
a metal cover plate, which is covered on the metal shell to form a first space into a closed space;
the PCB antenna is arranged in the second space;
the contact type ultrasonic sensor is arranged in the second space, and the detection end face of the contact type ultrasonic sensor is in contact with the tested equipment in a detection state;
the first end of the first cable is connected with the PCB antenna, and the second end of the first cable passes through the cable hole on the partition plate and is connected with the first connector;
the first end of the second cable is connected with the contact ultrasonic sensor, and the second end of the second cable passes through the cable hole on the partition plate and is connected with the second joint;
the first metal cable pressing seat and the second metal cable pressing seat are respectively arranged on one side of the first space on the partition plate and are respectively correspondingly connected with the metal cores of the first cable and the second cable in a contact manner.
In detection, the external acousto-electric composite sensor for GIS insulation defect detection can be connected with a detection system, the PCB antenna is used for detecting an ultrahigh frequency signal of tested equipment, and the ultrahigh frequency signal is transmitted through a first cable and a first metal cable pressing seat which is in contact connection with a metal core of the first cable; the contact type ultrasonic sensor is in contact with the tested equipment in a detection state, is used for receiving ultrasonic signals, and receives and transmits the ultrasonic signals through the second cable and the second metal cable pressing seat in contact connection with the metal core of the second cable. Through the arrangement, the external acousto-electric composite sensor can combine an ultrahigh frequency signal with an ultrasonic detection method, and detect the ultrahigh frequency signal and the ultrasonic signal at the same time, and is convenient for signal synchronization and favorable for combined positioning of the acousto-electric signals.
The metal shell can effectively shield external electromagnetic signals, so that signal interference is eliminated as much as possible, and detection quality is guaranteed. In the technical scheme of the application, the diameter of the cable hole can be slightly larger than that of the cable so that the cable can pass through the cable hole.
In addition, in the technical scheme of the application, the first metal cable pressing seat and the second metal cable pressing seat are respectively correspondingly contacted and connected with the metal cores of the first cable and the second cable, so that the first cable and the second cable play a good role in grounding at the corresponding metal cable pressing seats. In order to make the contact of the first cable, the second cable and the corresponding metal cable holder more reliable, in some embodiments, it may be soldered here.
Further, in the external acousto-electric composite sensor according to the present application, it further includes:
the cylindrical supporting sleeve is provided with a groove extending along the axial direction of the supporting sleeve, the supporting sleeve is arranged in the second space and between the partition plate and the substrate of the PCB antenna, the contact type ultrasonic sensor is sleeved in the supporting sleeve, and a signal output joint of the contact type ultrasonic sensor extends out of the groove;
an elastic element which is arranged in the supporting sleeve and is arranged between the bottom end surface of the contact ultrasonic sensor and the partition plate;
the substrate of the PCB antenna is provided with a hole so that the detection end face of the contact ultrasonic sensor can extend out of the substrate and the supporting sleeve of the PCB antenna to be in contact with tested equipment; the elastic element applies pressure to the contact ultrasonic sensor in the axial direction of the support sleeve to press it against the device under test in the detection state.
In the scheme, the supporting sleeve can be made of insulating materials, such as plastic with better strength; the elastic element may be a strong spring. Furthermore, the overall length of the elastic element is set to be slightly longer than the distance from the bottom of the contact ultrasonic sensor to the bottom of the support sleeve so that the contact ultrasonic sensor is always at the top end of the support sleeve without external force, and the top of the contact ultrasonic sensor is slightly higher than the metal shell. During testing, the external acoustic-electric composite sensor is attached to the basin-type insulator of the GIS equipment, so that the bottom of the metal shell is tightly attached to the basin-type insulator, and the top of the contact-type ultrasonic sensor is tightly attached to the basin-type insulator under the elasticity of the elastic element, so that an ultra-high frequency signal can be tested and an ultrasonic signal can be tested.
Further, in the external acoustic-electric composite sensor of the present application, the outer surface of the supporting sleeve is provided with a protruding portion protruding radially outwards, and an axial end surface of the protruding portion abuts against the substrate of the PCB antenna, so that the supporting sleeve is limited between the partition plate and the substrate of the PCB antenna.
In the external acousto-electric composite sensor of the present application, the first joint and/or the second joint is/are an N-type joint.
Further, in the external acoustic-electric composite sensor of the present application, the first metal cable holder and/or the second metal cable holder respectively include: the metal pressing block is fixedly arranged on the lug boss on the partition plate and detachably connected with the lug boss, and a pressing hole for correspondingly accommodating the first cable and/or the second cable is formed between the metal pressing block and the lug boss.
In the above-mentioned scheme, in order to facilitate the connection, in some embodiments, the metal pressing block is provided with a connection hole, and the boss is correspondingly provided with a connection hole, so that the metal pressing block and the boss are connected through a connecting piece such as a screw.
Further, in the external acousto-electric composite sensor of the present application, the diameter of the pressing hole is slightly smaller than the diameter of the metal core of the first cable and/or the second cable.
Further, in the external acousto-electric composite sensor provided by the application, the metal pressing block is a copper metal pressing block.
Further, in the external acousto-electric composite sensor, a first sealing ring is arranged between the first joint and/or the second joint and the wall of the first space; and/or a second sealing ring is arranged between the metal shell and the metal cover plate.
In the scheme, the first sealing ring and the second sealing ring are arranged to ensure that the external acoustic-electric composite sensor can be used for a long time in a wet environment. In addition, the outer surface of the wall of the first space should be as flat as possible so that the sealing ring can better play a protective role.
Further, in the external acoustic-electric composite sensor of the present application, an end surface of the metal housing on the side of the second space is provided as an arc-shaped end surface.
In the above scheme, since the basin-type insulator of the GIS equipment is generally cylindrical in shape, the end face of the metal shell on the side of the second space is provided with an arc-shaped end face, so that the external acoustic-electric composite sensor is better attached to the basin-type insulator.
Further, in the external electroacoustic composite sensor of the present application, an end surface of the metal housing on the side of the second space has an ear portion extending outward, a groove for accommodating the fastening strap is formed in the ear portion, and/or a fastening bolt is provided on the ear portion.
In the technical scheme of the application, when the external sound-electricity composite sensor is required to be used for short-term on-line monitoring, the external sound-electricity composite sensor can be directly attached to the basin-type insulator for monitoring, and if long-term on-line monitoring is required, a fastening belt (in some embodiments, a cloth belt) can be used for penetrating through a groove which is formed in an ear and is used for accommodating the fastening belt, and then the fastening belt is wound on the basin-type insulator for fixing, so that the external sound-electricity composite sensor can be fixed on the basin-type insulator.
The PCB antenna provided by the application has the advantages that the PCB antenna comprises two different detection main frequency bands by adopting the different-surface structure, so that the PCB antenna is suitable for detecting different discharge signals.
In addition, the external acousto-electric composite sensor for GIS insulation defect detection can effectively combine an ultrahigh frequency detection method and an ultrasonic detection method, so that the reliability and the positioning accuracy of a field band point detection structure are improved, and an ultrahigh frequency signal can comprise two different main detection frequency bands and is suitable for detection of different discharge signals.
In addition, the external sound-electricity composite sensor for GIS insulation defect detection has the advantages of good shielding effect and strong waterproof property, and can be continuously used in a humid environment.
Furthermore, the external acousto-electric composite sensor for GIS insulation defect detection is convenient to use, convenient to carry, particularly convenient to install and disassemble, and capable of being used for field detection and long-term on-line monitoring.
Drawings
Fig. 1 is a schematic overall structure diagram of an external acoustic-electric composite sensor for GIS insulation defect detection according to the present application under a view angle in an embodiment.
Fig. 2 is a schematic diagram of the overall structure of the external acoustic-electric composite sensor for GIS insulation defect detection according to the present application under another view angle in one embodiment.
Fig. 3 is an internal cross-sectional view of an external acoustic-electric composite sensor for GIS insulation defect detection according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a PCB antenna of the external acoustic-electric composite sensor for GIS insulation defect detection according to the present application under a view angle in an embodiment.
Fig. 5 is a schematic structural diagram of a PCB antenna of an external acoustic-electric composite sensor for GIS insulation defect detection according to the present application under another view angle in an embodiment.
Fig. 6 is a schematic structural diagram of a metal cover plate of an external acoustic-electric composite sensor for detecting GIS insulation defects according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of an uninstalled metal cover plate of an external acoustic-electric composite sensor for GIS insulation defect detection according to the present application under a view angle in an embodiment.
Fig. 8 is a schematic structural diagram of an uninstalled metal cover plate of an external acoustic-electric composite sensor for GIS insulation defect detection according to the present application in another view angle in an embodiment.
Fig. 9 is a schematic structural diagram of an uninstalled metal cover plate, a first joint and a second joint of the external acoustic-electric composite sensor for detecting GIS insulation defects according to an embodiment of the present application.
Fig. 10 is a schematic structural diagram of a signal output connector of an external acoustic-electric composite sensor for detecting GIS insulation defects according to an embodiment of the present application.
Fig. 11 is a schematic structural diagram of a support sleeve of an external acoustic-electric composite sensor for detecting GIS insulation defects according to an embodiment of the present application.
Fig. 12 is a schematic structural diagram of an elastic element of an external acoustic-electric composite sensor for detecting GIS insulation defects according to an embodiment of the present application.
Fig. 13 is a schematic structural diagram of a first joint and a second joint of an external acoustic-electric composite sensor for detecting GIS insulation defects according to an embodiment of the present application.
Fig. 14 is a schematic structural diagram of a metal compact of an external acoustic-electric composite sensor for GIS insulation defect detection according to an embodiment of the present application.
Detailed Description
The external sound-electricity composite sensor for GIS insulation defect detection according to the present application will be further explained and illustrated with reference to the accompanying drawings and specific embodiments, however, the explanation and illustration do not unduly limit the technical scheme of the present application.
Fig. 1 is a schematic overall structure diagram of an external acoustic-electric composite sensor for GIS insulation defect detection according to the present application under a view angle in an embodiment. Fig. 2 is a schematic diagram of the overall structure of the external acoustic-electric composite sensor for GIS insulation defect detection according to the present application under another view angle in one embodiment. Fig. 3 is an internal cross-sectional view of an external acoustic-electric composite sensor for GIS insulation defect detection according to an embodiment of the present application.
As shown in fig. 1, and as necessary in combination with fig. 2 and 3, the external acoustic-electric composite touch sensor 1 for GIS insulation defect detection in the present embodiment includes: the metal housing 11, in which a partition is provided to divide the interior of the metal housing into a first space I and a second space II, and a first cable hole 132 and a second cable hole 142 (the first cable hole 132 and the second cable hole 142 refer to fig. 9) are provided on the partition, the first cable hole 132 and the second cable hole 142 may be provided as two circular holes having the same diameter, and the first cable hole 132 and the second cable hole 142 are used to pass through the first cable and the second cable; a first cable having a first end connected to the PCB antenna 15 and a second end connected to the first connector 13 on the wall of the first space I through the first cable hole 132 on the partition, a second cable having a first end connected to the contact ultrasonic sensor 16 and a second end connected to the second connector 14 on the wall of the first space I through the second cable hole 142 on the partition, so that the diameters of the first cable hole 132 and the second cable hole 142 may be set to be slightly larger than the diameters of the first and second cables to facilitate the passage of the first and second cables; a metal cover plate 12 covering the metal housing 11 to form a first space I as a closed space; a PCB antenna 15 provided in the second space II; the contact type ultrasonic sensor 16 is arranged in the second space II, and the detection end surface of the contact type ultrasonic sensor 16 is in contact with the tested equipment in a detection state; the first metal cable pressing seat 181 and the second metal cable pressing seat 182 are arranged on one side of the partition plate, which is located in the first space I, and the first metal cable pressing seat 181 and the second metal cable pressing seat 182 are respectively correspondingly in contact connection with metal cores of the first cable and the second cable.
In addition, as can be seen from fig. 2 and 3, the external acoustic-electric composite sensor in the present embodiment further includes a cylindrical support sleeve 161, the support sleeve 161 is disposed in the second space II and between the partition plate and the substrate of the PCB antenna 15, the contact type ultrasonic sensor 16 is sleeved in the support sleeve 161, and the signal output connector 31 (see fig. 10 for the structure of the signal output connector 31) of the contact type ultrasonic sensor 16 protrudes from a groove provided on the cylindrical surface of the support sleeve; an elastic member 162 provided in the support sleeve 161 and provided between the bottom end surface of the contact ultrasonic sensor 16 and the partition plate;
wherein, the substrate of the PCB antenna 15 is provided with a central hole 150 (refer to fig. 4 and 5) so that the detection end face of the contact ultrasonic sensor 16 can extend out from the substrate of the PCB antenna 15 and the supporting sleeve 161 to contact with the tested equipment; the elastic member 162 applies pressure to the contact ultrasonic sensor 16 in the axial direction of the support sleeve 161 to press it against the device under test in the detection state.
Further, as can be seen from fig. 2, the end face of the metal housing 11 on the side of the second space is provided as an arc-shaped end face.
With respect to the structure of each component and the connection relationship between each component of the external acoustic-electric composite sensor in this embodiment, further reference may be made to fig. 4 to 14.
Fig. 4 is a schematic structural diagram of a PCB antenna of the external acoustic-electric composite sensor for GIS insulation defect detection according to the present application under a view angle in an embodiment. Fig. 5 is a schematic structural diagram of a PCB antenna of an external acoustic-electric composite sensor for GIS insulation defect detection according to the present application under another view angle in an embodiment.
As shown in fig. 4 and 5, and as necessary, in combination with fig. 2 and 3, the PCB antenna 15 includes a substrate and an antenna provided on the surface of the substrate, the substrate has a first surface and a second surface respectively provided on both sides thereof, the first surface shown in fig. 4 is provided with a first loop antenna 151 and a second loop antenna 152, the second surface shown in fig. 5 is provided with a third loop antenna 153 and a fourth loop antenna 154, wherein the fourth loop antenna has an inner recess 1541 recessed inward therein, it can be seen from the feeder point 155 that parallel connection is adopted between the first loop antenna 151 and the second loop antenna 152, and serial connection is adopted between the third loop antenna 153 and the fourth loop antenna 154. In addition, the central position of the PCB antenna 15 has a central hole 150 with the same diameter as the support sleeve 161 for passing through the support sleeve 161.
The PCB antenna 15 is formed by using an epoxy resin plate as a substrate, and fixing holes are formed at four corners of the substrate to be matched with the screw holes 19 shown in fig. 8, and the PCB antenna 15 is fixed in the external acoustic-electric composite sensor 1 by using a connecting member such as a screw.
Since the PCB antenna 15 is composed of a plurality of circular loop antennas, the resonant operating frequency f of each circular loop antenna r Can be determined by formula (1):
wherein L is the circumference of the ring, and C is the speed of light.
In addition, the first surface of the PCB antenna 15 in this case adopts a parallel connection output mode of the first circular ring antenna 151 and the second circular ring antenna 152 that are connected in parallel, the diameters of the two circular rings of the first circular ring antenna 151 and the second circular ring antenna 152 are the same and larger than the diameter of the central hole 150, the first circular ring antenna 151 and the second circular ring antenna 152 are on the same plane and have the same resonant frequency, and the coupled energy is superimposed, so that the device can be used for detecting the part with higher frequency in the discharge signal, such as 1.3-1.5GHz; and the third circular antenna 153 and the fourth circular antenna 154 connected in series are adopted for the second surface of the PCB antenna 15, wherein the circular structure of the fourth circular antenna 154 is symmetrically bent, that is, the fourth circular antenna 154 has at least one pair of concave parts 1541 symmetrically arranged opposite to each other to increase the effective length of the antenna to reduce the resonance frequency, and since the third circular antenna 153 and the fourth circular antenna 154 are in different planes and have different resonance frequencies, the third circular antenna 153 and the fourth circular antenna 154 can be used for detecting the lower frequency part of the discharge signal, such as 400 MHz to 600MHz.
Fig. 6 is a schematic structural diagram of a metal cover plate of an external acoustic-electric composite sensor for detecting GIS insulation defects according to an embodiment of the present application.
As shown in fig. 6, and as necessary, in combination with fig. 1 to 3, the metal cover 12 is provided with a metal cover hole 121, which is fitted with the metal housing hole 111 of the metal housing shown in fig. 9, and the metal cover 12 is fixed to the metal housing 11 by a connecting member such as a screw hole to form the first space I into an enclosed space. In order to make the installation firm, the metal cover plate holes 121 may be provided in a plurality, for example, 14.
Fig. 7 is a schematic structural diagram of an uninstalled metal cover plate of an external acoustic-electric composite sensor for GIS insulation defect detection according to the present application under a view angle in an embodiment. Fig. 8 is a schematic structural diagram of an uninstalled metal cover plate of an external acoustic-electric composite sensor for GIS insulation defect detection according to the present application in another view angle in an embodiment.
As shown in fig. 7, and as necessary, in combination with fig. 1 to 3, in the first space I, in addition to the first joint 13, the second joint 14, the first cable hole 132, the second cable hole 142, the first metal cable press seat 181, and the second metal cable press seat 182, a second seal ring 172 is provided between the metal housing 11 and the metal cover plate 12. Furthermore, a first sealing ring is provided between the first and second joints 13, 14 and the wall of the first space I. The first sealing ring and the second sealing ring 172 are provided to ensure that the external acoustic-electric composite sensor 1 can be used for a long time in a wet environment.
As shown in fig. 8, and as necessary in combination with fig. 1 to 3, the second space II includes the contact ultrasonic sensor 16, the support sleeve 161, and the elastic member 162 sleeved in the support sleeve 161, and the specific structure of the above components may further refer to fig. 10 to 12. The threaded hole 19 is used for fixing the PCB antenna 15 in the external acoustic-electric composite sensor 1.
Fig. 9 is a schematic structural diagram of an uninstalled metal cover plate, a first joint and a second joint of the external acoustic-electric composite sensor for detecting GIS insulation defects according to an embodiment of the present application.
Fig. 9 illustrates the structure between the various components in the present case. The first joint port 131 and the second joint port 141 are connected to the first joint 13 and the second joint 14 by providing threads.
Referring to fig. 9, it can be seen that the end surface of the metal housing 11 located at the side of the second space has an outwardly protruding ear portion 112, a groove for receiving a fastening strap is formed in the ear portion 112, and in some embodiments, a fastening bolt may be further provided on the ear portion 112 to strengthen the fixation.
Further, the first metal cable-pressing seat 181 and the second metal cable-pressing seat 182 will be described with reference to fig. 3, 9, and 14, and the first metal cable-pressing seat 181 and the second metal cable-pressing seat 182 respectively include: the first boss 1811 and the second boss 1821 which are fixedly arranged on the partition board, and the metal pressing block 180 which is detachably connected with the first boss 1811 and the second boss 1821 are formed between the metal pressing block 180 and the first boss 1811 and the second boss 1821, and a pressing hole which is used for correspondingly accommodating the first cable and/or the second cable is formed, and the aperture of the pressing hole is slightly smaller than the diameter of the metal core of the first cable and/or the second cable. The metal pressing block 180 is a copper metal pressing block, two fixing holes and an arc-shaped groove are formed in the metal pressing block and are fixed on the metal shell through screws, the diameter and depth of the groove are consistent with those of the grooves on the first boss 1811 and the second boss 1821, a first cable and a second cable penetrating through the pressing holes penetrate through the middle of the two grooves, then wire cores of the two cables are welded on metal cores of the first connector 13 and the second connector 14, the metal pressing block 180 can press the penetrating first cable and second cable, the aperture of the fastening holes is slightly smaller than that of the metal cores of the first cable and/or the second cable, the first cable and the second cable can adopt double-shielding coaxial cables, the outer surface of a cable part where the metal pressing block 180 presses is required to be stripped, the outer layer of the cable is well grounded at the position, and in order to enable the cable to be contacted more reliably, soldering tin can be welded at the position.
Fig. 10 is a schematic structural diagram of a signal output connector of an external acoustic-electric composite sensor for detecting GIS insulation defects according to an embodiment of the present application. Fig. 11 is a schematic structural diagram of a support sleeve of an external acoustic-electric composite sensor for detecting GIS insulation defects according to an embodiment of the present application. Fig. 12 is a schematic structural diagram of an elastic element of an external acoustic-electric composite sensor for detecting GIS insulation defects according to an embodiment of the present application.
The structure of the contact ultrasonic sensor in this embodiment will be further described with reference to fig. 10 to 12. In this embodiment, the support sleeve 161 is made of an insulating material, for example, plastic with better strength, and the elastic member 162 may be made of a strong spring. As can be seen from fig. 2, 10 to 12, the supporting sleeve 161 is cylindrical and hollow, the diameter of the middle circular hole is the same as that of the contact ultrasonic sensor 16, and the supporting sleeve is vertically placed in the second space II of the metal shell 11 during installation, the outer surface of the supporting sleeve 16 is provided with a protruding part 41 protruding radially outwards, and the axial end surface of the protruding part 41 abuts against the substrate of the PCB antenna 15 so as to limit the supporting sleeve 161 between the partition plate and the substrate of the PCB antenna 15. The cylindrical surface of the supporting sleeve 161 is provided with a groove 42, the contact type ultrasonic sensor 16 is placed in the central cavity of the supporting sleeve 161, the signal output connector 31 passes through the groove 42, the contact type ultrasonic sensor 16 can slide up and down in the central cavity, and when the signal output connector reaches the top end of the groove 42, the top end of the movement of the contact type ultrasonic sensor 16 is the top end of the movement of the contact type ultrasonic sensor 16.
The elastic element 162 is placed in the central cavity of the supporting sleeve 161, so that the overall outer diameter of the elastic element 162 is smaller than that of the central cavity of the supporting sleeve 161, one end of the elastic element 162 is placed at the bottom of the second space II of the metal shell 11, the other end of the elastic element 162 is in contact with the bottom of the contact type ultrasonic sensor 16, and the overall length of the elastic element 162 is slightly longer than the distance from the bottom of the contact type ultrasonic sensor 16 to the bottom of the supporting sleeve 161, so that the contact type ultrasonic sensor 16 is always positioned at the top end of the supporting sleeve 161 under the action of no external force, the top of the contact type ultrasonic sensor 16 is slightly higher than the top point of the arc structure at the bottom of the metal shell 11, and the external acoustic-electric composite sensor 1 is attached to the basin insulator of the GIS during testing, so that the arc at the bottom of the metal shell 11 is clung to the basin insulator, and the top of the contact type ultrasonic sensor 16 is clung to the basin insulator under the elasticity of the elastic element 162, so that ultra-high frequency signals can be tested.
Fig. 13 is a schematic structural diagram of a first joint and a second joint of an external acoustic-electric composite sensor for detecting GIS insulation defects according to an embodiment of the present application.
As shown in fig. 13, the first connector 13 and the second connector 14 may be connected to a testing apparatus respectively to perform partial discharge detection, where the first connector 13 receives an ultrahigh frequency signal and the second connector 14 receives an ultrasonic signal. The first and second contacts 13 and 14 are N-type contacts.
Fig. 14 is a schematic structural diagram of a metal compact of an external acoustic-electric composite sensor for GIS insulation defect detection according to an embodiment of the present application.
It should be noted that, in this embodiment, the metal housing 11 and the metal cover 12 may be made of lighter metal materials to keep the same, so that a closed space is formed inside the external electroacoustic composite sensor, and the electromagnetic interference signals outside the sensor can be more effectively shielded, the contact surfaces of the metal housing 11 and the metal cover 12 are ensured to be flat, so that the first sealing ring and the second sealing ring 172 on the metal housing 11 can better play a role in protection
When the external sound-electricity composite sensor 1 is needed to be monitored on line in a short period, the external sound-electricity composite sensor 1 can be directly attached to the basin-type insulator to be monitored, if the external sound-electricity composite sensor 1 is needed to be monitored on line in a long period, a fastening belt (in some embodiments, a cloth belt) can be used to penetrate through a groove which is formed in the ear 112 and is used for accommodating the fastening belt, and then the fastening belt is wound on the basin-type insulator to be fixed, so that the external sound-electricity composite sensor 1 can be fixed on the basin-type insulator.
The PCB antenna 15 receives different UHF signals of the main detection frequency band and the contact ultrasonic sensor 16 receives ultrasonic signals, the received UHF signals and ultrasonic signals are transmitted to the first connector 13 and the second connector 14 through the first cable and the second cable, and then the received UHF signals and ultrasonic signals can be transmitted to other equipment through the first connector 13 and the second connector for data analysis processing.
It should be noted that the prior art part in the protection scope of the present application is not limited to the embodiments given in the present document, and all prior art that does not contradict the scheme of the present application, including but not limited to the prior patent document, the prior publication, the prior disclosure, the use, etc., can be included in the protection scope of the present application.
In addition, the combination of the features described in the present application is not limited to the combination described in the claims or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradiction occurs between them.
It should also be noted that the above-recited embodiments are merely specific examples of the present application. It is apparent that the present application is not limited to the above embodiments, and similar changes or modifications will be apparent to those skilled in the art from the present disclosure, and it is intended to be within the scope of the present application.
Claims (11)
1. An external acousto-electric composite sensor for GIS insulation defect detection, which is characterized by comprising:
the cable connector comprises a metal shell, wherein a partition plate is arranged in the metal shell to divide the interior of the metal shell into a first space and a second space, a cable hole is formed in the partition plate, and a first connector and a second connector are arranged on the wall of the first space;
a metal cover plate, which is covered on the metal shell to form a first space into a closed space; a PCB antenna arranged in the second space; the PCB antenna comprises a substrate and an antenna arranged on the surface of the substrate, wherein the substrate is provided with a first surface and a second surface which are respectively positioned on two side surfaces of the substrate, the first surface is provided with a first circular ring antenna and a second circular ring antenna which are connected in parallel, the second surface is provided with a third circular ring antenna and a fourth circular ring antenna which are connected in series, and the fourth circular ring antenna is provided with an inner concave part which is concave inwards;
the contact type ultrasonic sensor is arranged in the second space, and the detection end face of the contact type ultrasonic sensor is in contact with the tested equipment in a detection state;
the first end of the first cable is connected with the PCB antenna, and the second end of the first cable passes through the cable hole on the partition plate and is connected with the first connector;
the first end of the second cable is connected with the contact ultrasonic sensor, and the second end of the second cable passes through the cable hole on the partition plate and is connected with the second joint;
the first metal cable pressing seat and the second metal cable pressing seat are respectively arranged on one side of the first space on the partition board and are correspondingly in contact connection with metal cores of the first cable and the second cable;
the first connector and/or the second connector are/is an N-type connector;
the first metal cable pressing seat and/or the second metal cable pressing seat respectively comprise: the metal pressing block is fixedly arranged on the lug boss on the partition plate and detachably connected with the lug boss, and a pressing hole for correspondingly accommodating the first cable and/or the second cable is formed between the metal pressing block and the lug boss.
2. The external acoustic-electric composite sensor of claim 1, further comprising:
the cylindrical supporting sleeve is provided with a groove extending along the axial direction of the supporting sleeve, the supporting sleeve is arranged in the second space and between the partition plate and the substrate of the PCB antenna, the contact type ultrasonic sensor is sleeved in the supporting sleeve, and a signal output joint of the contact type ultrasonic sensor extends out of the groove;
an elastic element which is arranged in the supporting sleeve and is arranged between the bottom end surface of the contact ultrasonic sensor and the partition plate;
the substrate of the PCB antenna is provided with a hole so that the detection end face of the contact ultrasonic sensor can extend out of the substrate and the supporting sleeve of the PCB antenna to be in contact with tested equipment; the elastic element applies pressure to the contact ultrasonic sensor in the axial direction of the support sleeve to press it against the device under test in the detection state.
3. The external acoustic-electric composite sensor of claim 2, wherein the outer surface of the support sleeve is provided with a radially outwardly projecting boss, an axial end surface of the boss abutting against the substrate of the PCB antenna to confine the support sleeve between the spacer and the substrate of the PCB antenna.
4. The external acoustic-electric composite sensor of claim 1, wherein the aperture of the hold-down hole is slightly smaller than the diameter of the metal core of the first cable and/or the second cable.
5. The external acoustic-electric composite sensor of claim 1, wherein the metal compact is a copper metal compact.
6. The external acoustic-electric composite sensor of claim 1, wherein a first sealing ring is provided between the first joint and/or the second joint and the wall of the first space; and/or a second sealing ring is arranged between the metal shell and the metal cover plate.
7. The external acoustic-electric composite sensor of claim 1, wherein an end surface of the metal housing on the side of the second space is provided as an arc-shaped end surface.
8. The external acoustic-electric composite sensor according to claim 1, wherein the end face of the metal housing on the side of the second space has an ear portion extending outward, the ear portion is provided with a groove for accommodating the fastening strap, and/or the ear portion is provided with a fastening bolt.
9. The external acoustic-electric composite sensor of claim 1, wherein the first loop antenna and the second loop antenna have the same diameter and the first loop antenna and the second loop antenna have the same resonant frequency.
10. The external acoustic-electric composite sensor of claim 1, wherein the fourth loop antenna has at least one pair of the concave portions symmetrically disposed with respect to each other.
11. The external acoustic-electric composite sensor of claim 1, wherein the substrate is an epoxy plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810179800.2A CN108535609B (en) | 2018-03-05 | 2018-03-05 | PCB antenna and external acoustic-electric composite sensor for GIS insulation defect detection |
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| CN201810179800.2A CN108535609B (en) | 2018-03-05 | 2018-03-05 | PCB antenna and external acoustic-electric composite sensor for GIS insulation defect detection |
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| CN109557183A (en) * | 2018-12-30 | 2019-04-02 | 国网辽宁省电力有限公司电力科学研究院 | A kind of integrated form ultrasonic sensor |
| CN114047414B (en) * | 2021-11-11 | 2024-04-02 | 国网上海市电力公司 | Be used for defect test simulation in GIS air chamber to use convenient change structure |
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