CN212514712U - High tension switchgear tank wall integral type superfrequency sensor - Google Patents
High tension switchgear tank wall integral type superfrequency sensor Download PDFInfo
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- CN212514712U CN212514712U CN202022180588.7U CN202022180588U CN212514712U CN 212514712 U CN212514712 U CN 212514712U CN 202022180588 U CN202022180588 U CN 202022180588U CN 212514712 U CN212514712 U CN 212514712U
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- switch cabinet
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Abstract
The utility model relates to a high-voltage switch cabinet wall integrated ultrahigh frequency sensor, which comprises an insulating cover, an insulating plate and a metal patch component, wherein the metal patch component comprises a first metal patch and a second metal patch which are the same, one surface of the insulating plate is connected with the inner wall of the wall of a switch cabinet box, the other surface 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 cavity formed by the insulating cover and the wall of the switch cabinet box, 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 wall of the switch cabinet is provided with a second through hole and a gap, the first through hole and the second through hole are coaxial, one end of the coaxial cable is respectively in conduction connection with the first metal patch and the second metal patch, the other end of the coaxial cable is in conduction connection with the coaxial cable connector sequentially through the gap, the first through hole and the second through hole, and the coaxial cable connector is in conduction connection with the wall of the switch cabinet. Compared with the prior art, the design is simple, the processing is convenient, and the installation or the disassembly is easy.
Description
Technical Field
The utility model belongs to the technical field of high tension switchgear partial discharge detection and specifically relates to a high tension switchgear case wall integral type superfrequency sensor is related to.
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, the guarantee of high-quality reliable power supply is a necessary way for guaranteeing the operation and maintenance of the 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. UHF is a new technology developed in recent years, which determines whether a device has PD by measuring electromagnetic waves radiated from a potential insulation hazard of a high-voltage device at an operating voltage, and the method can perform non-contact measurement and is widely applied to online detection of electrical devices. For the self characteristics of the high-voltage switch cabinet equipment, as shown in fig. 8(a) - (d), UHF detection sensors including a metal radiation patch (CN 104868240 a), a reconfigurable antenna (a square annular microstrip patch, CN 110927541 a), a microstrip slot antenna (CN 104515940 a) and a snowflake microstrip antenna (high voltage technology, vol.42, No. 10: 3207-. However, the prior art shows that the sensor is complex in design and processing, inconvenient to popularize and use on equipment, and certain special conditions are required for installation, so that the use of the UHF detection method in online monitoring and live detection of insulation defect PDs of high-voltage switch cabinet equipment is greatly limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high tension switchgear tank wall integral type superfrequency sensor in order to overcome the defect that above-mentioned prior art exists.
The purpose of the utility model can be realized through the following technical scheme:
a high-voltage switch cabinet wall integrated ultrahigh-frequency sensor comprises an insulating cover, an insulating plate and a metal patch component, wherein the metal patch component comprises a first metal patch and a second metal patch which are the same, one surface of the insulating plate is connected with the inner wall of the 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 cavity formed by the insulating cover and 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, one end of a coaxial cable is respectively connected with the first metal patch and the second metal patch in a conduction mode, and the other end of the coaxial cable is connected with a coaxial cable connector in a conduction mode through the gap, the coaxial cable connector is connected with the wall of the switch cabinet in a conduction mode.
The first metal patch is a copper patch, and the second metal patch is a copper patch.
And the insulating plate is respectively bonded with the first metal patch and the second metal patch.
The insulating plate is a polyethylene insulating plate.
Coaxial cable includes cable conductor and the shielding layer around cable conductor, the second metal paster is connected to the one end of cable conductor, first metal paster is connected to the one end of shielding layer.
And one end of the cable core wire is welded with the second metal patch.
And the insulating plate is bonded with the inner wall of the switch cabinet.
The coaxial cable joint is connected with the wall of the switch cabinet through a metal bolt.
The insulating cover is connected with the wall of the switch cabinet through an insulating bolt.
A method for installing the ultrahigh frequency sensor integrated with the wall of the high-voltage switch cabinet comprises the following steps:
step S1: one end of the 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, and the gap is coaxial with the first through hole;
step S3: the other surface of the insulating plate is connected with the inner wall of the switch cabinet box, and the second through hole, the gap and the first through hole are coaxial;
step S4: the insulation cover is in insulation connection with the wall of the switch cabinet;
step S5: the other end of the coaxial cable is connected with a first coaxial cable connector in a conduction manner;
step S6: the coaxial cable connector is connected with the wall of the high-voltage switch cabinet in a conduction mode.
Compared with the prior art, the utility model has the advantages of it is following:
(1) the coaxial cable connector, the high-voltage switch cabinet box wall, the insulating cover, the insulating plate and the metal patch component form a complementary dipole double-patch antenna capable of coupling ultrahigh-frequency electromagnetic wave signals, the complementary dipole double-patch antenna is adopted to form the high-voltage switch cabinet box wall integrated ultrahigh-frequency sensor, the design is simple, the processing is convenient, the mounting or dismounting steps are few, and the application range of the high-voltage switch cabinet tank wall integrated ultrahigh-frequency sensor is greatly expanded.
(2) The formed high-voltage switch cabinet wall integrated ultrahigh-frequency sensor utilizes the switch cabinet box body as a ground plane, and the signal output terminal can be operated under the electrified operating condition, so that the electrified detection/inspection of the insulation state of the internal components of the high-voltage switch cabinet is realized, and signals can be provided for an online monitoring device or an intensive care system.
Drawings
Fig. 1 is a schematic structural diagram of the high-frequency sensor of the present invention;
FIG. 2 is a sectional view taken along line A-A of the UHF sensor of the present invention;
fig. 3 is a schematic view of the installation structure of the uhf sensor of the present invention;
fig. 4(a) - (e) are schematic diagrams of the installation steps of the uhf sensor of the present invention;
fig. 5 is a directional diagram of the uhf sensor of the present invention;
FIG. 6 shows the standing-wave ratio of the UHF sensor of the present invention;
FIGS. 7(a) - (d) are single discharge detection time domain signals of the UHF sensor of the present invention under different pressurization conditions;
FIG. 8(a) is a prior art metallic radiating patch UHF sensor;
FIG. 8(b) is a prior art square ring microstrip patch UHF sensor;
FIG. 8(c) is a prior art UHF sensor with microstrip slot antenna;
FIG. 8(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 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 coaxial cable; 12 is a cable core; 13 is a first through hole; and 14 is a second via.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The 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 ultrahigh frequency sensor for a wall of a high-voltage switch cabinet, that is, a complementary dipole double-patch antenna which is combined with the wall of the high-voltage switch cabinet and can couple ultrahigh frequency electromagnetic wave signals, as shown in fig. 1, the integrated ultrahigh frequency sensor 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 wall 5 of the switch cabinet, 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 cavity formed by the insulating cover 4 and the wall 5 of the switch cabinet, a gap is formed between the first metal patch 2 and the second metal patch 3, the insulating plate 1 is provided with a first through hole 13, the wall 5 of the switch cabinet is provided with, one end of the coaxial cable 11 is respectively connected with the first metal patch 2 and the second metal patch 3 in a conduction mode, the other end of the coaxial cable is sequentially connected with the coaxial cable connector 6 in a conduction mode through the gap, the first through hole 13 and the second through hole 14, and the coaxial cable connector 6 is connected with the wall 5 of the switch cabinet in a conduction mode.
Specifically, the method comprises the following steps:
the wall 5 of the high-voltage switch cabinet is grounded through a switch cabinet grounding wire resistor 9, and a discharge source 10 is arranged in the high-voltage switch cabinet.
The other end of the coaxial cable 11 is connected to the coaxial cable connector 6 via a connector with the coaxial cable 11, and the connector 8 with the coaxial cable is screwed to the coaxial cable connector 6.
The first metal patch 2 is a copper patch, and the second metal patch 3 is a copper patch; the polyethylene insulation board is respectively bonded with the first metal patch 2 and the second metal patch 3.
The insulation board 1 is bonded with the inner wall of the switch cabinet box wall 5, the coaxial cable connector 6 is connected with the switch cabinet box wall 5 through a metal bolt, and the insulation cover 4 is connected with the switch cabinet box wall 5 through an insulation bolt.
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 can also be adhered to an insulating plate such as polyethylene to realize arrangement.
Fig. 4(a) - (e) show a method for installing an integrated uhf sensor on a wall of a high-voltage switch cabinet, which mainly comprises 5 steps, specifically as follows (replacement or removal can also be referred to):
step 4, insulating sealing and reliable connection are carried out on the parts formed in the step 3 by using 4 insulating bolts through an insulating cover 4 with a proper size;
and 5, after the coaxial cable joint 6 is in threaded connection with the joint 8 with the coaxial cable, the coaxial cable joint 6 and the outer wall of the high-voltage switch cabinet box wall 5 are reliably installed by using 4 metal bolts, before installation, the insulating paint on the outer wall of the high-voltage switch cabinet box wall 5 corresponding to the coaxial cable joint 6 needs to be scraped completely, the shielding layer (grounding) of the coaxial cable joint 6 is ensured to be reliably connected with the high-voltage switch cabinet box wall 5 in a conducting manner, and therefore the working grounding of the complementary dipole double-patch type antenna is achieved.
Fig. 5 and 6 are directional diagrams and standing-wave ratio diagrams of the high-voltage switch cabinet wall integrated ultrahigh-frequency sensor, and the measured parameters after processing are as follows: the length of the copper patch is 5cm, the width of the copper patch is 10cm, the thickness of the copper patch is 5mm, the gap distance of 2 copper patches is 1cm, and the thickness of the insulating plate (polyethylene) is 1 cm.
Fig. 7(a) - (d) show the time domain signals of single discharge detection of set defects under different pressurization conditions (weak to strong) by the high-voltage switch cabinet wall integrated ultrahigh frequency sensor.
Claims (9)
1. The high-voltage switch cabinet wall integrated ultrahigh-frequency sensor is characterized by comprising an insulating cover (4), an insulating plate (1) and a metal patch component, wherein 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 a switch cabinet wall (5), the other surface of the insulating plate 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 cavity formed by the insulating cover (4) and the switch cabinet wall (5), a gap is formed between the first metal patch (2) and the second metal patch (3), the insulating plate (1) is provided with a first through hole (13), the switch cabinet wall (5) is provided with a second through hole (14), and the gap, The first through hole (13) and the second through hole (14) are coaxial, one end of the coaxial cable (11) is respectively connected with the first metal patch (2) and the second metal patch (3) in a conduction mode, the other end of the coaxial cable sequentially passes through the gap, the first through hole (13) and the second through hole (14) to be connected with the coaxial cable connector (6) in a conduction mode, and the coaxial cable connector (6) is connected with the wall (5) of the switch cabinet in a conduction mode.
2. The high-voltage switch cabinet wall integrated ultrahigh-frequency sensor according to claim 1, wherein the first metal patch (2) is a copper patch, and the second metal patch (3) is a copper patch.
3. The high-voltage switch cabinet wall integrated ultrahigh-frequency sensor according to claim 1, wherein the insulating plate (1) is bonded with the first metal patch (2) and the second metal patch (3) respectively.
4. The high-voltage switch cabinet wall integrated ultrahigh-frequency sensor according to claim 1, wherein the insulating plate (1) is a polyethylene insulating plate.
5. The high-voltage switch cabinet wall integrated ultrahigh-frequency sensor according to claim 1, wherein the coaxial cable (11) comprises a cable core (12) and a shielding layer surrounding the cable core (12), one end of the cable core (12) is connected with the second metal patch (3), and one end of the shielding layer is connected with the first metal patch (2).
6. The high-voltage switch cabinet wall integrated ultrahigh-frequency sensor according to claim 5, characterized in that one end of the cable core (12) is welded with the second metal patch (3).
7. The high-voltage switch cabinet wall integrated ultrahigh-frequency sensor according to claim 1, characterized in that the insulating plate (1) is bonded with the inner wall of the switch cabinet wall (5).
8. The ultrahigh frequency sensor as recited in claim 1, wherein the coaxial cable connector (6) is connected with the wall (5) of the switch cabinet through a metal bolt.
9. The ultrahigh frequency sensor as recited in claim 1, wherein the insulation cover (4) is connected with the wall (5) of the switch cabinet through an insulation bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022180588.7U CN212514712U (en) | 2020-09-29 | 2020-09-29 | High tension switchgear tank wall integral type superfrequency sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022180588.7U CN212514712U (en) | 2020-09-29 | 2020-09-29 | High tension switchgear tank wall integral type superfrequency sensor |
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| Publication Number | Publication Date |
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| CN212514712U true CN212514712U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022180588.7U Active CN212514712U (en) | 2020-09-29 | 2020-09-29 | High tension switchgear tank wall integral type superfrequency sensor |
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| CN (1) | CN212514712U (en) |
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