CN112067959A - Integrated electromagnetic ultrasonic composite sensor for high-voltage switch cabinet wall and mounting method - Google Patents
Integrated electromagnetic ultrasonic composite sensor for high-voltage switch cabinet wall and mounting method Download PDFInfo
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- CN112067959A CN112067959A CN202011047079.5A CN202011047079A CN112067959A CN 112067959 A CN112067959 A CN 112067959A CN 202011047079 A CN202011047079 A CN 202011047079A CN 112067959 A CN112067959 A CN 112067959A
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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
- G01R31/1209—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 using acoustic measurements
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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
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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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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Abstract
The invention relates to an integrated electromagnetic ultrasonic composite sensor for a high-voltage switch cabinet wall and an installation method thereof. Compared with the prior art, the device has the advantages of simple design and convenient processing, realizes the ultrahigh frequency, transient state to ground voltage and ultrasonic wave synchronous combined measurement of electromagnetic wave signals and ultrasonic signals generated by the insulation defect discharge of the internal components of the high-voltage switch cabinet, realizes the live detection/inspection, and can also provide signals for an online monitoring device or an intensive care system.
Description
Technical Field
The invention relates to the field of high-voltage switch cabinet partial discharge detection, in particular to an integrated electromagnetic ultrasonic composite sensor for a high-voltage switch cabinet wall and an installation method.
Background
The high-voltage switch cabinet is direct equipment of a power distribution network for supplying power to users, and the failure of the high-voltage switch cabinet can cause the power failure of the users, thereby bringing huge economic loss to the power distribution network and causing certain social influence; in addition, under the policy of creating a good operator environment, ensuring high-quality reliable power supply is a necessary way for guaranteeing operation and maintenance of a power grid. Because high tension switchgear inner structure is complicated, insulating interval is little, leads to it to appear insulating defect more easily than other electrical equipment in the electric wire netting, takes place Partial Discharge (PD) phenomena such as equipment insulating surface creepage under the condition of the condensation of weing. The long-term existence of PD can eventually lead to the insulation aging or deterioration or even damage of the equipment, which eventually develops into an insulation breakdown accident of the high-voltage switch cabinet. Therefore, it is very important to judge the insulation state through PD on-line monitoring and live detection of the high-voltage switch cabinet.
Currently, methods applied to detecting PD signals of a high-voltage switch cabinet mainly include an ultrasonic wave (AE) detection method, a transient voltage To Earth (TEV) detection method, an ultrahigh frequency (UHF) detection method, and the like. After years of application of ultrasonic detection method, item 1 of electric power industry standard 2015 DL/T1416 general technical conditions of ultrasonic method partial discharge tester is formed. Transient voltage-to-ground voltage detection has been applied for many years to section 10 of the 2016 DL/T846.10 general technical Condition for high Voltage test Equipment: transient ground voltage partial discharge detection, 2018DL/T195 local discharge detector calibration standard based on transient ground voltage method. The inside PD of the switch cabinet can generate electromagnetic waves, a skin effect is formed on a metal wall and the electromagnetic waves are propagated along the metal surface, meanwhile, transient voltage to ground is generated on the metal surface, and the signal detection or monitoring can be realized by utilizing a special transient voltage to ground voltage sensor in the prior art. The ultrahigh frequency is a new technology developed in recent years, which judges whether equipment has PD or not by measuring electromagnetic waves radiated by insulation hidden troubles of high-voltage equipment under operating voltage, and the method can be used for non-contact measurement and is widely applied to online detection of electrical equipment; for the self characteristics of high-voltage switch cabinet equipment, as shown in fig. 7(a) - (d), there are ultrahigh frequency detection sensors of metal radiation patches, reconfigurable antennas (square annular microstrip patches), microstrip slot antennas and snowflake type microstrip antennas at present.
The ultrasonic and transient voltage-to-ground detection is external and is easily interfered by external electromagnetic, so that detection personnel often suspects the detection result and cannot judge whether ultrasonic signals and electromagnetic signals are from the inside of a high-voltage switch cabinet or generated by an interference source, and thus serious short-circuit faults occur due to insulation breakdown caused by missing internal discharge signals. In the existing ultrahigh frequency technology, the sensor is complex to process and inconvenient to popularize and use in equipment manufacturers, and certain special conditions are required for installation, so that the ultrahigh frequency detection method is greatly limited to be used for online monitoring and live detection of insulation defects PD of high-voltage switch cabinet equipment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an integrated electromagnetic ultrasonic composite sensor for the wall of a high-voltage switch cabinet and an installation method thereof.
The purpose of the invention can be realized by the following technical scheme:
a high-voltage switch cabinet wall integrated electromagnetic ultrasonic composite sensor comprises a complementary dipole double-patch antenna, a transient voltage-to-earth voltage probe and an ultrasonic probe, wherein the complementary dipole double-patch antenna comprises an insulating cover, an insulating plate and a metal patch component, the metal patch component comprises a first metal patch and a second metal patch which are identical, one surface of the insulating plate is connected with the inner wall of a switch cabinet wall, the other surface of the insulating plate is symmetrically connected with the first metal patch and the second metal patch, the insulating plate, the first metal patch and the second metal patch are arranged in a first cavity formed by the insulating cover and the inner wall of the switch cabinet wall, a gap is formed between the first metal patch and the second metal patch, the insulating plate is provided with a first through hole, the switch cabinet wall is provided with a second through hole, the gap, the first through hole and the second through hole are coaxial, and one end of a first coaxial cable is respectively connected with the first metal patch and the second metal patch in a conducting, the other end of the ultrasonic probe is in conduction connection with a first coaxial cable connector sequentially through a gap, a first through hole and a second through hole, the transient voltage-to-earth voltage probe comprises two insulating sheets and two transient voltage-to-earth voltage metal patches, the insulating sheets and the transient voltage-to-earth voltage metal patches are alternately stacked and connected with each other, one surface of one insulating sheet is connected with the wall of the switch cabinet, one end of a cable core of the second coaxial cable is in conduction connection with the transient voltage-to-earth voltage metal patches on the outer side, the other end of the cable core of the second coaxial cable is in conduction connection with a second coaxial cable connector, a shielding layer of the second coaxial cable is in conduction connection with the transient voltage-to-earth voltage metal patches on the inner side and the working side of an inductor, the ultrasonic probe comprises a PZT sensor connected with the outer wall of the switch cabinet wall, the PZT sensor is positioned, the transient voltage-to-ground voltage probe and the ultrasonic probe are located in a second cavity formed by the first metal cover and the outer wall of the switch cabinet, the second through hole is located in the coverage range of the first metal cover, the first coaxial cable connector and the third coaxial cable connector are in conductive connection with the first metal cover, the second coaxial cable connector is in insulating connection with the first metal cover, and the grounding side of the inductor is in conductive connection with the first metal cover.
The second coaxial cable connector is connected with the first metal cover through the insulating gasket.
The insulation cover is connected with the wall of the switch cabinet through an insulation bolt, the first metal cover is connected with the wall of the switch cabinet through a metal bolt, and the second metal cover is connected with the wall of the switch cabinet through a metal bolt.
The first coaxial cable connector is connected with the first metal cover through a metal bolt, the second coaxial cable connector is connected with the first metal cover through an insulating bolt, and the third coaxial cable connector is connected with the first metal cover through a metal bolt.
One end of a cable core wire of the first coaxial cable is connected with the second metal patch, and the shielding layer of the first coaxial cable is connected with the first metal patch.
The first metal patch, the second metal patch and the two transient-state voltage-to-earth metal patches are all copper patches.
The insulation board is respectively bonded with the first metal patch and the second metal patch, and the insulation board is bonded with the transient voltage-to-earth voltage metal patch.
An insulating piece bonds with the cubical switchboard box wall, insulating board bonds with the cubical switchboard box wall.
The insulation board be the polyethylene insulation board, the insulating piece be the phenolic plastic insulating piece.
A method for installing the high-voltage switch cabinet wall integrated electromagnetic ultrasonic composite sensor comprises the following steps:
step S1: one end of the first coaxial cable is respectively connected with the feed points of the first metal patch and the second metal patch in a conducting manner;
step S2: one surface of the insulating plate is symmetrically connected with the first metal patch and the second metal patch, the other surface of the insulating plate is connected with the inner wall of the switch cabinet, and the second through hole, the gap and the first through hole are coaxial;
step S3: the insulating cover is connected with the inner wall of the switch cabinet;
step S5: the other end of the first coaxial cable is connected with a first coaxial cable connector in a conduction mode;
step S6: the two insulation sheets and the two transient voltage-to-earth metal patches are alternately stacked and connected, and one surface of one insulation sheet is connected with the outer wall of the switch cabinet;
step S7: one end of a cable core wire of the second coaxial cable is in conductive connection with the transient voltage-to-earth voltage metal patch on the outer side, the other end of the cable core wire of the second coaxial cable is in conductive connection with the second coaxial cable connector, and the shielding layer of the second coaxial cable is in conductive connection with the transient voltage-to-earth voltage metal patch on the inner side and the working side of the inductor;
step S8: the PZT sensor is connected with the outer wall of the switch cabinet, and the second metal cover is connected with the outer wall of the switch cabinet in a conduction manner;
step S9: the grounding side of the inductor is connected with the first metal cover in a conduction mode, the first coaxial cable connector and the third coaxial cable connector are connected with the first metal cover in a conduction mode, the second coaxial cable connector is connected with the first metal cover in an insulation mode, and the first metal cover is connected with the outer wall of the switch cabinet.
Compared with the prior art, the invention has the following advantages:
(1) the ultrahigh frequency, transient voltage to ground and ultrasonic synchronous combined measurement of electromagnetic wave signals and ultrasonic signals generated by insulation defect discharge of internal components of the high-voltage switch cabinet is realized.
(2) The integrated electromagnetic ultrasonic composite sensor for the high-voltage switch cabinet wall is easy to install (can be referred to for replacement or removal), has few steps, greatly expands the application range, and provides a reliable implementation method for integration, modularization and standardization of the equipment sensing unit.
(3) The electromagnetic ultrasonic composite sensor utilizes the inductor to block the mutual influence of the transmission of high-frequency electromagnetic wave signals, the output 2 paths of electromagnetic wave signals can be mutually proved, and the ultrasonic wave signals with time difference delta t can confirm whether the current detection signals are from the defect discharge of the internal insulation of the high-voltage switch cabinet, so that the serious short-circuit fault caused by insulation breakdown due to the missing of the internal discharge signals can be avoided.
(4) The high-voltage switch cabinet box wall integrated electromagnetic ultrasonic composite sensor utilizes the switch cabinet box body as a ground plane, and 3 signal output terminals can be operated under the electrified operating condition to realize electrified detection/inspection and also can provide signals for an online monitoring device or an intensive care system.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of the present invention;
FIG. 3 is a schematic view of the mounting structure of the present invention;
FIG. 4 is a schematic diagram of the operation of the transient voltage to ground probe of the present invention;
FIGS. 5(a) - (h) are schematic diagrams illustrating steps for mounting the electromagnetic ultrasonic composite sensor according to the present invention;
FIGS. 6(a) - (c) are 3-path single discharge detection time-domain signals of the electromagnetic ultrasonic composite sensor under different pressurization conditions;
FIG. 7(a) is a metal radiating patch UHF sensor in the prior art;
FIG. 7(b) is a prior art UHF sensor with square annular microstrip patches;
FIG. 7(c) is a prior art UHF sensor with microstrip slot antenna;
FIG. 7(d) is a very high frequency sensor of snowflake type microstrip antenna in the prior art;
reference numerals:
1 is an insulating plate; 2 is a first metal patch; 3 is a second metal patch; 4 is an insulating cover; 5, the wall of the switch cabinet; 6 is a first coaxial cable joint; 7 is a feeding point; 8 is a connector with a coaxial cable; 9 is the resistance of the grounding wire of the switch cabinet; 10 is a discharge source; 11 is a first coaxial cable; 12 is a second coaxial cable; 13 is a first through hole; 14 is a second through hole; 15 is a signal acquisition device; 16 is an insulating sheet; 17 is a transient voltage-to-ground metal patch; 18 is an inductor; 19 is a third coaxial cable; 20 is a first metal cover; 21 is a second coaxial cable connector; 22 is an insulating washer; 23 is a third coaxial cable connector; 24 is a second metal cover; and 25, PZT sensor.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Examples
The embodiment provides an integrated electromagnetic ultrasonic composite sensor for a high-voltage switch cabinet wall, which comprises a complementary dipole double-patch antenna for coupling ultrahigh-frequency electromagnetic wave signals, as shown in fig. 1, and the complementary dipole double-patch antenna is composed of an insulating cover 4, a first metal patch 2, a second metal patch 3, an insulating plate 1, a first coaxial cable joint 6 and a high-voltage switch cabinet wall 5; the capacitive voltage division type transient voltage-to-ground voltage probe capable of coupling electromagnetic wave signals is composed of two transient voltage-to-ground voltage metal patches 17, two insulating sheets 16, an inductor 18, a second coaxial cable connector 21, a first metal cover 20 and the high-voltage switch cabinet wall 5; the PZT sensor 25, the second metal cover 24, the third coaxial cable joint 23 and the high-voltage switch cabinet wall 5 form an ultrasonic probe which can be coupled with ultrasonic signals; therefore, the cabinet and box wall integrated electromagnetic ultrasonic composite sensor for realizing the synchronous joint measurement of ultrahigh frequency, transient voltage to ground and ultrasonic waves of electromagnetic waves and ultrasonic signals generated by the insulation defect discharge of the internal components of the high-voltage switch cabinet is formed.
Specifically, the method comprises the following steps:
one side of insulation board 1 connects the inner wall of cubical switchboard tank wall 5, another side symmetric connection first metal paster 2 and second metal paster 3, insulation board 1, the first cavity that insulating boot 4 and cubical switchboard tank wall 5's inner wall formed is arranged in to first metal paster 2 and second metal paster 3, form the clearance between first metal paster 2 and the second metal paster 3, insulation board 1 is equipped with first through-hole 13, cubical switchboard tank wall 5 is equipped with second through-hole 14, the clearance, first through-hole 13 and second through-hole 14 are coaxial, the one end of first coaxial cable 11 switches on respectively connects first metal paster 2 and second metal paster 3, the other end loops through the clearance, first through-hole 13 and second through-hole 14 switch on connects first coaxial cable joint 6.
The insulation sheets 16 and the transient state voltage-to-earth metal patches 17 are alternately stacked and connected with each other, one surface of one insulation sheet 16 is connected with the wall 5 of the switch cabinet, one end of the cable core of the second coaxial cable 12 is conductively connected with the transient state voltage-to-earth metal patch 17 on the outer side, the other end is conductively connected with the second coaxial cable connector 21, and the shielding layer of the second coaxial cable 12 is conductively connected with the transient state voltage-to-earth metal patch 17 on the inner side and the working side of the inductor 18.
The PZT sensor 25 is connected with the outer wall of the switch cabinet wall 5, the PZT sensor 25 is positioned in a third cavity formed by the conductive connection of the first metal cover 20 and the outer wall of the switch cabinet wall 5, the PZT sensor 25 is connected with a third coaxial cable connector 23 in a conductive manner, the transient voltage-to-ground voltage probe and the ultrasonic probe are positioned in a second cavity formed by the first metal cover 20 and the outer wall of the switch cabinet wall 5, the second through hole 14 is positioned in the coverage range of the first metal cover 20, the first coaxial cable connector 6 and the third coaxial cable connector 23 are connected with the first metal cover 20 in a conductive manner, the second coaxial cable connector 21 is connected with the first metal cover 20 in an insulating manner, and the grounding side of the inductor 18 is connected with the first metal cover 20 in a conductive manner.
The high-voltage switch cabinet wall 5 is grounded through a switch cabinet grounding wire resistor 9, a discharge source 10 is arranged in the high-voltage switch cabinet, the electromagnetic ultrasonic composite sensor is connected with a signal acquisition device 15, one end of a first coaxial cable 11 is connected with a first coaxial cable connector 6 through a connector 8 with a coaxial cable, the connector 8 with the coaxial cable is in threaded connection with the first coaxial cable connector 6, one end of a second coaxial cable 12 is connected with a second coaxial cable connector 21 through the connector 8 with the coaxial cable, the connector 8 with the coaxial cable is in threaded connection with the second coaxial cable connector 21, one end of a third coaxial cable 19 is connected with a third coaxial cable connector 23 through the connector 8 with the coaxial cable, and the connector 8 with the coaxial cable is in threaded connection with the third coaxial cable connector 23.
The second coaxial cable connector 21 is connected to the first metal cover 20 through an insulating washer 22.
The insulation cover 4 is connected with the wall 5 of the switch cabinet through an insulation bolt, the first metal cover 20 is connected with the wall 5 of the switch cabinet through a metal bolt, and the second metal cover 24 is connected with the wall 5 of the switch cabinet through a metal bolt; the first coaxial cable connector 6 is connected to the first metal cover 20 by a metal bolt, and the second coaxial cable connector 21 is connected to the first metal cover 20 by an insulating bolt.
One end of the cable core of the first coaxial cable 11 is connected with the second metal patch 3, and the shielding layer of the first coaxial cable 11 is connected with the first metal patch 2.
The first metal patch 2, the second metal patch 3 and the two transient earth voltage metal patches 17 are all copper patches; the insulation board 1 is respectively bonded with the first metal patch 2 and the second metal patch 3, and the insulation sheet 16 is bonded with the transient voltage-to-earth voltage metal patch 17; an insulation sheet 16 is bonded with the wall 5 of the switch cabinet, and an insulation plate 1 is bonded with the wall 5 of the switch cabinet; the insulating plate 1 is a polyethylene insulating plate, and the insulating sheet 16 is a phenolic plastic insulating sheet.
The operating characteristics of the complementary dipole dual patch antenna are determined by the length l, width w, thickness h, gap distance b of the first metal patch 2 and the second metal patch 3, and the thickness k of the insulating plate 1. Because a gap is left between the first metal patch 2 and the second metal patch 3 for symmetrical arrangement, according to the dipole theory, the gap impedance (i.e. the ultrahigh frequency sensor impedance) is in direct proportion to the dipole admittance, and the performance of the complementary gap of the dipole can be predicted by knowing the performance of the dipole, so that the dipole is complementary with the structure of the gap.
The copper patch and the insulating plate 1 of the complementary dipole double-patch type antenna can be formed by arranging a conductive copper sheet on the surface of a dielectric substrate of a bottom lining grounding plate, wherein the bottom lining grounding plate is in metal conductive contact with the wall 5 of the high-voltage switch cabinet; the conductive copper sheet may be attached to the insulating plate 1 made of polyethylene or the like.
The working principle of the transient voltage-to-ground voltage probe is shown in fig. 4, an insulation sheet 16 arranged between an inner transient voltage-to-ground voltage metal patch 17 and the wall of a switch cabinet forms a capacitor Cc1, a capacitor Cc2 formed by the insulation sheet 16 is arranged between the two transient voltage-to-ground voltage metal patches 17, the capacitor Cc and a series capacitor form a capacitive voltage-dividing type electromagnetic wave coupling transient voltage-to-ground voltage probe, and an inductor 18 is connected in series between a shielding layer (grounding) of the second coaxial cable 12 and the wall of the switch cabinet to block high-frequency electromagnetic waves from entering the acquisition device from the grounding side.
Fig. 5(a) - (h) show the installation method of the integrated electromagnetic ultrasonic composite sensor for the wall of the high-voltage switch cabinet, which mainly includes 8 steps, specifically as follows (the replacement or removal can also be referred to):
step 4, the insulating cover 4 with proper size seals and reliably connects the parts formed in the step 3 by using 4 insulating bolts, so that the complementary dipole double-patch type antenna and the wall 5 of the high-voltage switch cabinet are installed;
step 8, conducting welding is carried out on the grounding side of the inductor 18 and the first metal cover 20; then, after the second coaxial cable connector 21 is in threaded connection with the second coaxial cable connector 8, the coaxial cable connector 1 and the metal cover are installed reliably in an insulating mode by using 4 insulating bolts and insulating washers 22, and the electromagnetic wave signal output interface of the transient voltage-to-ground voltage probe is fixedly installed; after the first coaxial cable joint 6 is in threaded connection with the first joint 8 with the coaxial cable, the first coaxial cable joint 6 and the first metal cover 20 are reliably installed in a conducting manner by using 4 metal bolts, and the fixed installation of the ultrahigh frequency electromagnetic wave signal output interface of the complementary dipole double-patch type antenna is completed; after the third coaxial cable connector 23 is in threaded connection with the third coaxial cable-equipped connector 8, the third coaxial cable connector 23 and the first metal cover 20 are installed reliably in a conductive manner by using 4 metal bolts, and the ultrasonic signal output interface of the ultrasonic probe based on the PZT sensor 25 is fixedly installed; the first metal cover 20 is then securely attached to the outer wall of the high-voltage switchgear cabinet wall 5 by means of 4 metal screws.
Fig. 6(a) - (c) are output time domain waveform diagrams of the integrated electromagnetic ultrasonic composite sensor for the wall of the high-voltage switch cabinet, and the measurement parameters after the complementary dipole double patch type antenna is processed are as follows: the first metal patch 2 and the second metal patch 3 are 5cm in length, 10cm in width, 5mm in thickness, 1cm in gap distance and 1cm in thickness of the insulating plate 1 (polyethylene); the measurement size parameters after the capacitive electromagnetic wave coupling transient voltage-to-ground voltage probe is processed are as follows: the two transient voltage-to-earth metal patches 17 are 5cm in length, 5cm in width and 2mm in thickness, and the two insulating sheets 16 are made of insulating wood (phenolic plastics) and are 5cm in length, 5cm in width and 2mm in thickness; inductance 18L ═ 1100 nh; the PZT sensor 25 was chosen for the following main parameters: the resonance frequency was 150kHz and the peak sensitivity was 75dB in the 30kHz to 200kHz range.
Claims (10)
1. The integrated electromagnetic ultrasonic composite sensor for the high-voltage switch cabinet wall is characterized by comprising a complementary dipole double-patch type antenna, a transient voltage-to-ground voltage probe and an ultrasonic probe, wherein the complementary dipole double-patch type antenna comprises an insulating cover (4), an insulating plate (1) and a metal patch component, the metal patch component comprises a first metal patch (2) and a second metal patch (3) which are the same, one surface of the insulating plate (1) is connected with the inner wall of the switch cabinet wall (5), the other surface of the insulating plate (1) is symmetrically connected with the first metal patch (2) and the second metal patch (3), the insulating plate (1), the first metal patch (2) and the second metal patch (3) are arranged in a first cavity formed by the insulating cover (4) and the inner wall of the switch cabinet wall (5), and a gap is formed between the first metal patch (2) and the second metal patch (3), the insulation board (1) is provided with a first through hole (13), the switch cabinet wall (5) is provided with a second through hole (14), the gap, the first through hole (13) and the second through hole (14) are coaxial, one end of a first coaxial cable (11) is respectively connected with a first metal patch (2) and a second metal patch (3) in a conduction mode, the other end of the first coaxial cable is sequentially connected with a first coaxial cable connector (6) in a conduction mode through the gap, the first through hole (13) and the second through hole (14), the transient voltage-to-ground probe comprises two insulation sheets (16) and two transient voltage-to-ground metal patches (17), the insulation sheets (16) and the transient voltage-to-ground metal patches (17) are alternately stacked and connected with each other, one surface of one insulation sheet (16) is connected with the switch cabinet wall (5), one end of a cable core wire of a second coaxial cable (12) is connected with the transient voltage-, the other end of the ultrasonic probe is in conductive connection with a second coaxial cable connector (21), a shielding layer of a second coaxial cable (12) is in conductive connection with a transient earth voltage metal patch (17) at the inner side and a working side of an inductor (18), the ultrasonic probe comprises a PZT sensor (25) connected with the outer wall of the switch cabinet wall (5), the PZT sensor (25) is positioned in a third cavity formed by the first metal cover (20) and the outer wall of the switch cabinet wall (5), the PZT sensor (25) is in conductive connection with a third coaxial cable connector (23), the transient earth voltage probe and the ultrasonic probe are positioned in a second cavity formed by the first metal cover (20) and the outer wall of the switch cabinet wall (5), the second through hole (14) is positioned within the coverage range of the first metal cover (20), and the first coaxial cable connector (6) and the third coaxial cable connector (23) are in conductive connection with the first metal cover (20), the second coaxial cable connector (21) is connected with the first metal cover (20) in an insulating mode, and the grounding side of the inductor (18) is connected with the first metal cover (20) in a conducting mode.
2. The integrated electromagnetic ultrasonic composite sensor for the wall of the high-voltage switch cabinet as claimed in claim 1, wherein the second coaxial cable connector (21) is connected with the first metal cover (20) through an insulating gasket (22).
3. The integrated electromagnetic ultrasonic composite sensor for the wall of the high-voltage switch cabinet as claimed in claim 1, wherein the insulation cover (4) is connected with the wall (5) of the switch cabinet through an insulation bolt, the first metal cover (20) is connected with the wall (5) of the switch cabinet through a metal bolt, and the second metal cover (24) is connected with the wall (5) of the switch cabinet through a metal bolt.
4. The integrated electromagnetic ultrasonic composite sensor for the wall of the high-voltage switch cabinet as claimed in claim 1, wherein the first coaxial cable connector (6) is connected with the first metal cover (20) through a metal bolt, the second coaxial cable connector (21) is connected with the first metal cover (20) through an insulating bolt, and the third coaxial cable connector (23) is connected with the first metal cover (20) through a metal bolt.
5. The integrated electromagnetic ultrasonic composite sensor for the wall of the high-voltage switch cabinet as claimed in claim 1, wherein one end of the cable core of the first coaxial cable (11) is connected with the second metal patch (3), and the shielding layer of the first coaxial cable (11) is connected with the first metal patch (2).
6. The integrated electromagnetic ultrasonic composite sensor for the wall of the high-voltage switch cabinet as claimed in claim 1, wherein the first metal patch (2), the second metal patch (3) and the two transient voltage-to-ground voltage metal patches (17) are all copper patches.
7. The integrated electromagnetic ultrasonic composite sensor for the wall of the high-voltage switch cabinet as claimed in claim 1, wherein the insulating plate (1) is bonded with the first metal patch (2) and the second metal patch (3) respectively, and the insulating plate (16) is bonded with the transient voltage-to-earth voltage metal patch (17).
8. The integrated electromagnetic ultrasonic composite sensor for the wall of the high-voltage switch cabinet as claimed in claim 1, wherein an insulating sheet (16) is bonded to the wall (5) of the switch cabinet, and the insulating sheet (1) is bonded to the wall (5) of the switch cabinet.
9. The integrated electromagnetic ultrasonic composite sensor for the wall of the high-voltage switch cabinet as claimed in claim 1, wherein the insulating plate (1) is a polyethylene insulating plate, and the insulating sheet (16) is a phenolic plastic insulating sheet.
10. A method for mounting the high-voltage switch cabinet wall integrated electromagnetic ultrasonic composite sensor as claimed in any one of claims 1 to 9, which is characterized by comprising the following steps:
step S1: one end of the first coaxial cable (11) is respectively connected with the feed points (7) of the first metal patch (2) and the second metal patch (3) in a conduction manner;
step S2: one surface of the insulating plate (1) is symmetrically connected with the first metal patch (2) and the second metal patch (3), the other surface of the insulating plate (1) is connected with the inner wall of the wall (5) of the switch cabinet, and the second through hole (14), the gap and the first through hole (13) are coaxial;
step S3: the insulating cover (4) is connected with the inner wall of the box wall (5) of the switch cabinet;
step S5: the other end of the first coaxial cable (11) is connected with a first coaxial cable joint (6) in a conduction manner;
step S6: the two insulating sheets (16) and the two transient voltage-to-earth metal patches (17) are alternately stacked and connected, and one surface of one insulating sheet (16) is connected with the outer wall of the box wall (5) of the switch cabinet;
step S7: one end of a cable core wire of the second coaxial cable (12) is conductively connected with the transient voltage-to-earth voltage metal patch (17) at the outer side, the other end of the cable core wire is conductively connected with the second coaxial cable connector (21), and the shielding layer of the second coaxial cable (12) is conductively connected with the transient voltage-to-earth voltage metal patch (17) at the inner side and the working side of the inductor (18);
step S8: the PZT sensor (25) is connected with the outer wall of the wall (5) of the switch cabinet, and the second metal cover (24) is connected with the outer wall of the wall (5) of the switch cabinet in a conduction way;
step S9: the grounding side of the inductor (18) is connected with a first metal cover (20) in a conduction mode, the first coaxial cable connector (6) and the third coaxial cable connector (23) are connected with the first metal cover (20) in a conduction mode, the second coaxial cable connector (21) is connected with the first metal cover (20) in an insulation mode, and the first metal cover (20) is connected with the outer wall of the wall (5) of the switch cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113866621A (en) * | 2021-09-26 | 2021-12-31 | 广东电网有限责任公司 | Partial discharge signal detection system of high-voltage switch cabinet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866621A (en) * | 2021-09-26 | 2021-12-31 | 广东电网有限责任公司 | Partial discharge signal detection system of high-voltage switch cabinet |
| CN113866621B (en) * | 2021-09-26 | 2023-06-13 | 广东电网有限责任公司 | Partial discharge signal detection system of high-voltage switch cabinet |
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