CN105629142B - For the built-in uhf sensor assembling structure of GIS partial discharge on-line monitoring - Google Patents
For the built-in uhf sensor assembling structure of GIS partial discharge on-line monitoring Download PDFInfo
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- CN105629142B CN105629142B CN201610007907.XA CN201610007907A CN105629142B CN 105629142 B CN105629142 B CN 105629142B CN 201610007907 A CN201610007907 A CN 201610007907A CN 105629142 B CN105629142 B CN 105629142B
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/065—Means for detecting or reacting to mechanical or electrical defects
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Abstract
The present invention relates to a kind of built-in uhf sensor assembling structures for GIS partial discharge on-line monitoring, belong to partial discharge monitoring field inside GIS, including be fastened on GIS device cavity metal cover board, be fixed on antenna body on the inside of metal cover board by adjustable for height metal bolts and fitting is fixed on the impedance transformer of antenna body lower surface；Feed connection on antenna body front is equipped with conductive through hole；Impedance transformer one end is equipped with protrusion, and raised size matches with conductive through hole and exposes antenna body front across conductive through hole；The other end of impedance transformer connects the BNC connector with hermetic seal technique through sub-miniature A connector with double layer screen coaxial line successively；Metal cover board is equipped with and the matched signal leadout hole of BNC connector shape.It is an advantage of the invention that size is small, installation operation is simple and convenient, fixation is reliable, air-tightness is good, impedance matching precision is high and can realize that sensing station is adjusted.
Description
Technical field
The present invention relates to partial discharge monitoring fields inside GIS, and in particular to one kind is online for GIS partial discharge
The built-in uhf sensor assembling structure of monitoring.
Background technology
GIS with maintenance workload it is few, compact-sized, easy for installation many advantages, such as, in recent years gradually become it is super special
Mainstream equipment in high-voltage electric power system project construction, reliability of operation have been to be concerned by more and more people.Because manufacturing, transporting
The many factors such as defeated, assembled in situ, operation and Maintenance and Repair influence, and GIS inevitably generates insulation performance there are some
The insulation defect of threat, these defects often generate partial discharge phenomenon in early stage.If shelf depreciation long-term existence can make the electricity of GIS
It draws last breath edge reduced performance, eventually leads to insulation fault.And it is to judge to use the shelf depreciation inside appropriate method monitoring GIS
A kind of effective means of GIS insulation long-term reliabilities, can find generation of the early stage potential danger so as to prevent accident in time.Cause
This, realizes the on-line monitoring of shelf depreciation inside GIS, to preventing accident, raising utilization rate of equipment and installations, realizing traditional " periodically inspection
Repair " there is important practical significance to changing for " repair based on condition of component ".
In GIS when of short duration partial breakdown occurs in the media range of very little, the pulse current of a nanosecond can be generated.
This pulse can be motivated with electromagnetic wave of the hyperfrequency (UHF) with range (300MHz-3GHz) even higher frequency content, and
It is gradually spread at discharge source.And the cavity body structure of GIS can regard low-loss coaxial waveguide as, electromagnetic wave signal is at it
Inside can effectively propagate.The principle of UHF methods is exactly this steep by shelf depreciation using a ultrahigh frequency antenna sensor reception
The ultra-high frequency signal that pulse is excited and propagated is so as to obtain shelf depreciation for information about.
Partial discharge uhf sensor is divided into built-in and two kinds of external.Wherein external sensor have it is easy for installation,
The features such as being easy to carry about with one, but easily influenced by interference such as external coronas, and it is weaker to receive signal.In addition, current GIS manufacturers are general
All over using the insulator for having metal flange to wrap up, this causes outer sensor that can not receive the electromagnetic wave leaked at insulator.
During using built-in uhf sensor, installation site is reserved in pipeline, and guide to signal is received in GIS manufacture initial stages
GIS forms monitoring system in vitro, therefore has many advantages, such as high sensitivity, is not easy by external disturbance and running environment influence of noise.
However space limited inside GIS causes certain restrictions, and want strict guarantee hermetic seal to size sensor
Property, this requires must take into consideration sensor installation, the hermetic seal of signal lead-out wire and sensor at the beginning of GIS is designed to cavity original
The influence for having electric field to be distributed, better application is obtained using appropriate sensor assembly method.Meanwhile currently to sensor with
The resistance matching problem of transmission line consider it is insufficient, cause sensor output signal cannot completely, really reflect discharge characteristic.It adopts
The resistance matching problem in superwide range can be solved with impedance transformer, but how to complete impedance change in a limited space
One of the installation and fixation of parallel operation simultaneously meet Practical Project requirement, be also a problem to be solved.In previous methods, antenna body
The mode that connection with impedance transformer is worn copper conductor and be welded to connect using hole is pricked on antenna body, though this method through
Experiment and performance test are crossed, but connection is not secured enough, do not met the requirement of practical application, and manual welding spot size is not easy to slap
Control, it is larger to impedance matching influential effect.In addition, the ultrabroad band characteristic of sensor be Partial Discharge Detection diagnosis premise and
Necessary guarantee, and size sensor has direct relation with bandwidth.It is limited by GIS cavity spaces, existing built-in sensors (such as
Current most common dish-type antenna) bandwidth is extremely limited, how really to realize that the ultrabroad band of built-in sensors need to be solved
Certainly.
Based on above analysis, currently in the installation and application of the built-in uhf sensor of partial discharge monitoring
There is apparent deficiencies for aspect, need more reasonable, science and easily assembly method solves the problems in practical application.
Invention content
The technical problems to be solved by the invention be to provide a kind of size is small, installation operation is simple and convenient, fixation can
It leans on, air-tightness is good, high, the achievable sensing station of impedance matching precision adjusts and has the use of certain versatility and applicability
In the built-in uhf sensor assembling structure of GIS partial discharge on-line monitoring.
To solve the above problems, the technical solution used in the present invention is：
For the built-in uhf sensor assembling structure of GIS partial discharge on-line monitoring, key technology is to wrap
Included the metal cover board being fastened on GIS device cavity, antenna body on the inside of metal cover board is fixed on by metal bolts and
Fitting is fixed on the impedance transformer of the antenna body lower surface；Antenna body on the metal cover board is installed and impedance becomes
The side of parallel operation is towards installing in GIS device cavity；The impedance transformer is between antenna body and metal cover board；It is described
Built-in uhf sensor includes antenna body, impedance transformer and sub-miniature A connector；
Described metal bolts one end is fixed on the non-conducting areas of antenna body, and the other end connects with the metal cover board
It connects；Feed connection on the antenna body is equipped with conductive through hole, is covered on the conductive through hole madial wall and conductive antenna
The conductive strips that arm is electrically connected；
Described impedance transformer one end is equipped with the protrusion that length is slightly above antenna body thickness, and the size of the protrusion is with leading
Electric through-hole matches and is arranged in conductive through hole, is inserted into from the back side of antenna body during assembling, and the protrusion is in antenna body
The both sides current-carrying part that front is exposed directly is welded by conductive antenna arm of the scolding tin respectively with antenna body front feed connection
Lead in succession, be the basis for ensureing electrical connection, and the conductive strips after being inserted into conductive through hole and the metallic conduction portion in the protrusion
It is the further guarantee for electrical connectivity and installation stability to divide close contact；The impedance transformer by using hot melt adhesive with
The back side of antenna body is bonded, and further improves the stability of the two connection；The other end of the impedance transformer is set
There is sub-miniature A connector, the sub-miniature A connector is through BNC connector of the double layer screen coaxial line connection with hermetic seal technique；
The metal cover board is equipped with to be fixed on the matched signal leadout hole of BNC connector shape, the BNC connector sealing
In the signal leadout hole of the metal cover board.
Further, of the invention its further includes line card, and the double layer screen coaxial line is fixed on adjacent gold by line card
Belong on bolt.
Further, it is fixed between the impedance transformer and antenna body lower surface by heating glue connection.
Further, the antenna body connect fixation with metal cover board through metal bolts, and the metal bolts length can
According to built-in uhf sensor, fitting depth is required and is determined in GIS device cavity, disclosure satisfy that antenna body and GIS
The parallel setting relationship of equipment cavity inner surface.
Further, annular groove is additionally provided on the metal cover board, flange seal washer is equipped with, and apply in the annular groove
Sealing silicone grease is wiped with, realizes the sealing of metal cover board and GIS device cavity.
Further, it is arranged with bolt hole on the non-conducting areas of the antenna body, the one of the metal bolts
End is fixedly connected by bolt hole with the antenna body, is adding plastic spacer close to antenna both sides on each metal bolts.
The metal cover board is equipped with to be added with the corresponding installation counterbore in bolt hole position, the other end of the metal bolts
It is fixed on after spring shim, flat shim in the installation counterbore of metal cover board, realizes built-in uhf sensor and metal cover board
Assembling and fixation.
Further, the signal leadout hole on the metal cover board be take, the scarce side circular through hole of lower concave station, upper recess thereof
Surface roughness on the inside of platform is no more than Ra1.6, and the surface roughness on the inside of lower concave station is no more than Ra3.2.Further, have
The joint sealing washer for having the BNC connector of sealing technology is mounted at the upper concave station being located on the inside of metal cover board, has sealing
The fastening gasket and nut of the BNC connector of technique are mounted at the lower concave station being located on the outside of metal cover board, fasten the good spiral shell
Imperial mother smears fluid sealant around the fastening gasket on the outside of joint sealing washer and metal cover board.
Further, installation through-hole, the installation through-hole and the method on GIS device cavity are additionally provided on the metal cover board
Orchid is fastened by bolts.
Further, the needs of broad band low frequency lower limit are extended according to built-in uhf sensor, it, will when needing extension
The conductive antenna arm of the antenna body is electrically connected respectively by its immediate metal bolts of conducting wire.Present invention design will
The conductive antenna arm of antenna body is electrically connected respectively by its immediate metal bolts of conducting wire, extends conductive antenna arm
Electric size, it is effective to drop under the premise of not increasing antenna body and impedance transformer size in limited GIS inner spaces
The low low-frequency minimum of built-in uhf sensor.
It is using advantageous effect caused by above-mentioned technical proposal：
(1) the problem of present invention is efficiently solved in GIS field condition complex conditions, and antenna body stablizes installation, and
The size of site space can be adapted to by adjusting the height of metal bolts；By setting protrusion and antenna sheet on impedance transformer
Body plug-in type assembles, and makes the two connection more secured, assembles easier；Due to having conductive strips in the conductive through hole in antenna body,
Two strip antenna conductive arms of raised current-carrying part and antenna body are in direct contact, then with spot welding mode that the two is straight
Welding is connect, the reliability of its electrical connection is further ensured, has not only cast out conducting wire transition portion in this way, avoids conducting wire connection
When the shortcomings that tie point is insecure, welding spot size is not easy to grasp, eliminate the adverse effect to impedance matching, and in raising group
Welding sequence has been greatly facilitated and simplified while filling fastness, has reduced the influence of welding difficulty and manual welding.
(2) present invention controls position of the antenna body in GIS device cavity by adjusting the length of metal bolts, makes
The surface of antenna body is substantially parallel with GIS device cavity inner surface, so as to reduce the influence to original field distribution；Using metal
Bolt is fixed, and ensure that the stability of antenna body installation, can resist a degree of external mechanical vibrations；Antenna two
Side is fastened using plastic spacer and metal bolts, ensures to protect while insulating properties between conductive antenna part and said metal bolt
Shield antenna face is not destroyed in fastening.
(3) present invention is realized using the BNC connector with hermetic seal technique and draws the signal of impedance transformer, and is set
The double shield measure to gas tightness has been counted, i.e., the signal leadout hole of metal cover board surface treatment considered critical has been designed and adopted
The sealing structure being combined with sealing ring, fastening gasket with fluid sealant；Signal leadout hole of the design with upper and lower concave station, and will
BNC connector mounting flange and joint sealing circle are placed on the inside of metal cover board, and sealing surface is made to sink to being protected, is prevented simultaneously
The generation that BNC connector surprisingly sprays under internal hyperbar.
(4) present invention is provided with line card, and the middle part of double layer screen coaxial line is fixed on adjacent metal bolts with line card
On, it can effectively avoid the failures such as coaxial line displacement, shaking and joint looseness caused by external shock or other factors；
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the structure diagram of side broken section of the present invention.
Fig. 2 be middle impedance converter of the present invention be index asymptote when side view.
Fig. 3 is front plan view when antenna body is planar equiangular spiral antenna in the present invention.
Fig. 4 be for the built-in uhf sensor that GIS partial discharge is monitored on-line conducting wire connection and adhesion without adhesiver and
S11 measured curves in the case of two kinds of through-hole connection and gluing.
Wherein, the grid shadow in Fig. 1~Fig. 3 represents current-carrying part, and diagonal line hatches represent the section in sectional view.Its
In, 1 antenna body, 2 impedance transformers, 3 protrusions, 4 conductive through holes, 5 bolts hole, 6 metal bolts, 7BNC connectors, 8 double layer screens
Concave station, 14 metal covers under coaxial line, 9SMA connectors, 10 line cards, 11 signal leadout holes, 12 installation counterbores, the upper concave stations of 13-1,13-2
Plate, 15 annular grooves, 16 flange seal washers, 17 spring shims, 18 flat shims, 19 plastic spacers, 20GIS equipment cavities, 21 peaces
Fill through-hole, 22 joint sealing washers.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, 1-4 and specific embodiment pair below in conjunction with the accompanying drawings
Invention carries out clear, complete description.
As shown in FIG. 1 to 3, the present embodiment includes the metal cover board 14 being fastened on GIS device cavity 20, passes through gold
Belong to the impedance change that bolt 6 is fixed on the antenna body 1 of 14 inside of metal cover board and fitting is fixed on 1 lower surface of antenna body
Parallel operation 2；The built-in uhf sensor includes antenna body 1, impedance transformer 2 and sub-miniature A connector 9；The metal cover board
It is installed towards GIS device cavity 20 is interior the side that antenna body 1 and impedance transformer 2 are equipped on 14；The impedance transformer 2
Between antenna body 1 and metal cover board 14；
Described 6 one end of metal bolts is fixed on the non-conducting areas of antenna body 1, the other end and the metal cover board 14
Connection；
Feed connection on the antenna body 1 is equipped with conductive through hole 4, be covered on 4 madial wall of conductive through hole with
The conductive strips that the conductive antenna arm is electrically connected；
Described 2 one end of impedance transformer is equipped with the protrusion 3 that length is slightly above 1 thickness of antenna body, raised 3 size
Match with conductive through hole 4 and be arranged in conductive through hole 4, be inserted into from the back side of antenna body 1 during assembling, conductive strips after insertion
It is in close contact with the metal conduction portions on described raised 3, the described raised 3 both sides conductive parts exposed in 1 front of antenna body
It is divided to directly to weld with 1 positive two strip antennas conductive arm of antenna body respectively by scolding tin and connects, is the key that ensure electrical connection,
And the conductive strips in conductive through hole 4 are for the more one layer of guarantee being electrically connected with raised 3 electrical contact；The impedance transformer
2 carry out be bonded by using hot melt adhesive with the back side of antenna body 1, both further improve the stability of connection；The impedance
The other end of converter 2 is equipped with sub-miniature A connector 9, and the sub-miniature A connector 9 has hermetic seal technique through the connection of double layer screen coaxial line 8
BNC connector 7；
The metal cover board 14 is equipped with to be sealed with the matched signal leadout hole 11 of 7 shape of BNC connector, the BNC connector 7
It is fixed in the signal leadout hole 11 of the metal cover board 14.
Further, of the invention its further includes line card 10, and the double layer screen coaxial line 8 is fixed on adjacent by line card 10
Metal bolts 6 on.
Further, it is fixed between 1 lower surface of the impedance transformer 2 and antenna body by heating glue connection.Into one
Step, the antenna body 1 connect fixation with metal cover board 14 through metal bolts 6, and 6 length of metal bolts can be according to built-in
Formula uhf sensor fitting depth in GIS device cavity 20 is required and is determined, disclosure satisfy that antenna body 1 and GIS device
The parallel setting relationship of 20 inner surface of cavity.
Further, annular groove 15 is additionally provided on the metal cover board 14, flange seal washer is equipped in the annular groove
16, and sealing silicone grease is coated with, realize the sealing of metal cover board 14 and GIS device cavity 20.
Further, bolt hole 5 is arranged on the non-conducting areas of the antenna body 1, the metal bolts 6
One end is fixedly connected by bolt hole 5 with the antenna body 1, is adding plastic mattress close to antenna both sides on each metal bolts 6
Piece 19.
The metal cover board 14 be equipped with 5 position of bolt hole it is corresponding installation counterbore 12, the metal bolts 6 it is another
One end is fixed on after adding spring shim 17, flat shim 18 in the installation counterbore 12 of metal cover board 14, realizes that built-in superelevation is kept pouring in
The assembling and fixation of sensor and metal cover board 14.
Further, the signal leadout hole 11 on the metal cover board 14 be take, the scarce side circular through hole of lower concave station,
No more than Ra1.6, the surface roughness on the inside of lower concave station 13-2 is not more than for surface roughness on the inside of upper concave station 13-1
Ra3.2。
Further, the joint sealing washer 22 of the BNC connector 7 with sealing technology, which is mounted in, is located at metal cover board 14
At the upper concave station 13-1 of inside, there is the fastening gasket of the BNC connector 7 of sealing technology and nut to be mounted in and be located at metal cover board
At the lower concave station 13-2 in 14 outsides, after having fastened nut, the fastening pad in 14 outside of joint sealing washer 22 and metal cover board
Fluid sealant is smeared around piece.
Further, installation through-hole 21, the installation through-hole 21 and GIS device cavity are additionally provided on the metal cover board 14
20 are fastened by bolts.
Further, the needs of broad band low frequency lower limit are extended according to built-in uhf sensor, it, will when needing extension
Two strip antenna conductive arms of the antenna body 1 are electrically connected respectively by its immediate metal bolts 6 of conducting wire.
The present embodiment includes antenna body 1 and the assembly welding of impedance transformer 2 and fixation, built-in uhf sensor
Assembling and fixation, BNC connector 7 and the installation of metal cover board 14 and sealing, the company of double layer screen coaxial line 8 with metal cover board 14
Connect sealing between fixed, metal cover board 14 and GIS device cavity 20 and when necessary expanding built-in formula uhf sensor
The structure of bandwidth low-frequency minimum, specifically, above structure includes following content：
(1) built-in uhf sensor includes planar equiangular spiral antenna, impedance transformer 2 and SMA in the present embodiment
Connector 9, frequency bandwidth 700MHz-3GHz；I.e. antenna body 1 employs planar equiangular spiral antenna, whole to use plane
Equiangular spiral structure；The microwave plank that planar equiangular spiral antenna is covered copper by single side is processed into；The plane equiangular spiral day
Line is electrically connected with one end of impedance transformer 2, and the other end and sub-miniature A connector 9 of impedance transformer 2 are electrically connected.
The welding assembly and fixed structure of the planar equiangular spiral antenna and impedance transformer 2 are included in impedance transformation
One length of lateral layout of 2 one end of device is slightly above the rectangular preiection 3 of planar equiangular spiral antenna thickness, and by plane isogonism spiral shell
The feed connection of rotation two arm center of antenna opens up the slightly larger rectangular conductive through-hole 4 in more above-mentioned 3 section of rectangular preiection, while
4 inner wall both sides of conductive through hole are laid with the metal conductor tracks being connected with conductive antenna arm respectively.It will be on impedance transformer 2 during assembling
Protrusion 3 is inserted into from the planar equiangular spiral antenna back side in conductive through hole 4, in the impedance that planar equiangular spiral antenna front is exposed
The two current-carrying part is directly carried out welding connection by 2 both sides of converter with scolding tin, is heated at the planar equiangular spiral antenna back side
Glue is applied to the both sides that 2 main part of impedance transformer connects with planar equiangular spiral antenna, realizes impedance transformer 2 in plane etc.
Welding assembly and fixation on the helical antenna of angle；In other words, after one end of impedance transformer 2 is connect with planar equiangular spiral antenna
It being bent, bending part is substantially parallel with plane where the planar equiangular spiral antenna, and the two of planar equiangular spiral antenna
A conductive antenna arm is electrically connected by the perforation on microwave plank with impedance transformer 2.
(2) the assembling fixed structure of the built-in uhf sensor and metal cover board 14, including：Using metal bolts
6 connect built-in uhf sensor with metal cover board 14 with fixed, and the length of metal bolts 6 is according to plane equiangular spiral day
Fitting depth of the line in GIS device cavity 20 is required and is determined；In position of the planar equiangular spiral antenna front without current-carrying part
It puts, symmetrically designs 4 bolts hole 5, aperture is adapted with above-mentioned 6 diameter of metal bolts；Also same on metal cover board 14
The installation counterbore 12 of 4 same sizes is designed on sample position.Metal bolts 14 are first through planar equiangular spiral antenna during assembling
Bolt hole 5 on, adding plastic spacer 19 close to planar equiangular spiral antenna both sides on each metal bolts 6, then by each metal
It is fixed in the installation counterbore 12 of metal cover board 14 after bolt 6 plus spring shim 17, flat shim 18, realizes plane equiangular spiral day
The assembling and fixation of line and metal cover board 14.
(3) installation and sealing structure of the BNC connector 7 with metal cover board 14 described in, including using with hermetic seal technique
BNC connector 7, be fixed on the signal leadout hole 11 of metal cover board 14.14 center of metal cover board takes concave station for both sides
The scarce side circular through hole of 13-1 and lower concave station 13-2, aperture are adapted with 7 size of BNC connector.Concave station 13- on metal cover board 14
Surface roughness near 1 inside mounting hole is no more than Ra1.6, the table on the outside of 14 times concave station 13-2 of metal cover board near mounting hole
Surface roughness is not more than Ra3.2.By the joint sealing washer 22 of BNC connector 7 loaded on 14 inside of metal cover board during assembling, by BNC
The fastening gasket and nut of connector 7 are loaded on outside, have fastened after nut in 14 outside of joint sealing washer 22 and metal cover board
Fastening gasket around smear fluid sealant.
(4) connection of the double layer screen coaxial line 8 and fixed structure, including being respectively SMA terminals and BNC using both ends
Its both ends is respectively connected on the impedance transformer 2 and metal cover board 14 with sub-miniature A connector 9 by the double layer screen coaxial line 8 of terminal
BNC connector 7, the middle part line card 10 of double layer screen coaxial line 8 is fixed on adjacent metal bolts 6；The bilayer screen
The input impedance for covering coaxial line 8 is 50 Ω, and the input impedance of planar equiangular spiral antenna is become by impedance transformer 2 by 135 Ω
Change to 50 Ω.
(5) sealing structure of the metal cover board 14 opens up annular groove 15 including using on the flange of metal cover board 14,
Flange seal washer 16 is put into annular groove 15, and smears sealing silicone grease.
(6) the built-in uhf sensor expands the structure of bandwidth low-frequency minimum, this structure is alternative construction, not
Necessary structure, including using conducting wire by two conductive antenna arms of planar equiangular spiral antenna respectively with adjacent metal bolts
6 are connected, so as to the electric size of extension antenna conductive arm.During operation, conducting wire one end is welded on to the end of a conductive antenna arm
The tip, the other end is wound on adjacent metal bolts 6 and tightening nut is fixed, two such conductive antenna arm just with metal bolts 6
And GIS device cavity 20 links together, and realizes the expansion of conductive antenna arm and the extension of electric size.
With reference to 1~Fig. 4 of attached drawing, more detailed description is done to patent of the present invention by following rationale.
In order to receive the local discharge signal in SHF band range (300MHz-3GHz), as uhf sensor
Antenna body 1 will must also have ultra-wide band range.And so in broad frequency range, the input impedance of antenna body 1 is simultaneously
Non- is changeless, and is differed farther out with the impedance of common coaxial transmission line, it is therefore desirable to be realized using impedance transformer 2
The matching of antenna body 1 and transmission line avoids generating signal reflex and return loss.Practical GIS field conditions are complicated, in operation
Equipment can be accompanied by certain mechanical oscillation, this requires firm is wanted in the connection of impedance transformer 2 and antenna body 1,
Installation method is easy under the premise of performance is ensured simultaneously, it is reliable to be electrically connected.Antenna body 1 and resistance disclosed in the present invention
The welding assembly of resistance parallel operation 2 is with fixing means as shown in Figure 1, impedance transformer 2 shown in Fig. 2 connect antenna body 1
One installation rectangular preiection 3 of one end design, is designed for insertion into formula assembling by impedance transformer 2 and antenna body 1, makes the two even
It connects more securely；Simultaneously because 4 inside of conductive through hole at 1 center of antenna body is equipped with metal conductor tracks so that both after insertion
Current-carrying part can be in direct contact, then directly be welded the two with spot welding mode, further ensure the reliability of electrical connection.This
Sample has not only cast out conducting wire transition portion, but also welding sequence has been greatly facilitated and simplified, and avoids the shortcomings that conducting wire connects.Separately
Outside, impedance transformer 2 with antenna body 1 is carried out by using hot melt adhesive be bonded, both further improves the stability of connection.
The built-in uhf sensor of conducting wire connection is connected the built-in uhf sensor that blend compounds glue with use through-hole to carry out
The comparison of S11 parameter testings, the results are shown in Figure 4.As can be seen that S11 curves have minor shifts, but full to the left after gluing is fixed
Sufficient S11<The frequency bandwidth variation of -10dB is little.It can be seen that the welding assembly of this antenna body 1 and impedance transformer 2 with
Fixing means can ignore antenna performance influence, be feasible.
The major issue of built-in uhf sensor when mounted is exactly avoided to electric field original in cavity point
Cloth impacts.The assembling fixing means of the built-in uhf sensor that the present invention designs and metal cover board 14, using 4 gold
Belong to connection and fixation that bolt 6 realizes antenna body 1 and metal cover board 14, as shown in Figure 1.It can be by adjusting metal bolts
6 length controls position of the antenna body 1 in GIS cavitys, and antenna body 1 surface is made to be put down substantially with GIS cavity inner surfaces
Row, so as to reduce the influence to original field distribution.4 position of mounting hole on 1 front of antenna body and metal cover board, select day
The positive region without current-carrying part of line ontology 1, can specifically determine according to 1 form of actual antennas ontology.As a result of nut
With the fastening means of plastic spacer 19, spring shim 17 and flat shim 18 cooperation, the stability that antenna body 1 is installed ensure that,
A degree of external mechanical vibrations can be resisted.Antenna both sides are fastened using plastic spacer and metal bolts, can ensure day
Antenna face is protected not to be destroyed in fastening between line current-carrying part and said metal bolt while insulating properties.
1 signal of antenna body is led into GIS containment portions and built-in hyperfrequency under the premise of hermetic seal is ensured
The major issue solved is had in sensor installation.The signal wire that the present invention designs draws the installation of connector and metal cover board 14
With encapsulating method, the extraction of 1 signal of antenna body is realized, and devise to airtight with the BNC connector 7 with hermetic seal technique
The double shield measure of envelope property, as shown in Figure 1.Wherein, with sealing technology BNC connector 7 have to meet, can not or
It lacks.At 14 center of metal cover board according to the length and cross-sectional shape and size of BNC connector 7, on one both sides band of processing is shallow
Concave station 13-1, lower concave station 13-2 scarce side circular through hole as signal leadout hole 11, for fixing BNC connector 7, both sides it is upper
Concave station 13-1, lower concave station 13-2 can play a protective role to the both ends of BNC connector 7 in the handling process.According to signal leadout hole
Inside surface roughness near 11 is processed no more than the requirement of Ra1.6, outer surface roughness no more than Ra3.2, passes through limit
The signal leadout hole processing technology of tabulation surface roughness ensures the leakproofness of 14 surface treatment of metal cover board, this is protected again for first
Barrier.Using 14 inner surface of metal cover board as sealing surface during assembling, the joint sealing washer 22 of BNC connector 7 is placed, outer surface is placed
The fastening gasket and nut of BNC connector 7 are fastened, after fastening outside joint sealing washer 22 and metal cover board 14
Fluid sealant is smeared around the fastening gasket of side, is further ensured that gas tightness, this is ensured again for second.Design has upper and lower concave station
Signal leadout hole, and BNC connector mounting flange and joint sealing circle are placed on the inside of metal cover board, sealing surface are made to sink to obtain
Protection, while generation that BNC connector is prevented surprisingly to be sprayed under internal hyperbar.
The connection for the signal wire that the present invention designs and fixed structure are respectively pair of SMA terminals and BNC terminals using both ends
Layer shielding coaxial line 8, the BNC connector 7 on the impedance transformer 2 and metal cover board 14 of sub-miniature A connector 9 is matched in connection, so as to establish
The extraction channel of 1 signal of antenna body, as shown in Figure 1.In addition, the middle part line card 10 of double layer screen coaxial line 8 is fixed on
On adjacent metal bolts 6, the double layer screen coaxial line 8 caused by external shock or other factors is avoided to shift, shake and
The failures such as sub-miniature A connector 9 and the loosening of BNC connector 7.
The sealing structure of metal cover board 14 that the present invention designs, including opening up annular groove using on 14 flange of metal cover board
15, flange seal washer 16 and the method for smearing sealing silicone grease are put into annular groove 15, to ensure the sealing of metal cover board 14
Property, as shown in Figure 1.
By microwave technology principle it is found that 1 full-size of antenna body is directly related to the range that can receive electromagnetic wavelength,
So as to determine the low-frequency minimum of 1 bandwidth of antenna body.And space limited inside GIS is limited to, 1 general size of antenna body
It can not be excessive.The 1 bandwidth low-frequency minimum expanding method of antenna body that the present invention designs, an antenna arm is welded on by conducting wire one end
Tip, the other end is wound on adjacent metal bolts 6 and tightening nut is fixed.Because of metal bolts 6 and 20 phase of GIS device cavity
Even, it so the two-arm of conductive antenna arm and metal bolts 6 and GIS device cavity 20 is made to link together, extends antenna and leads
The electric size of electric arm.Through actual test, this structure can be decreased obviously the S11 curves near -10dB, so as to effectively drop
The low-frequency minimum of low antenna body 1.
Preferably, in another embodiment, using the uhf sensor using equiangular spiral antenna as antenna body 1
For, the design of 4 position of conductive through hole is carried out, as shown in Figures 2 and 3.Part wherein except 4 region of conductive through hole,
Two-arm for equiangular spiral antenna.Under original state, metal bolts 6 not with two arm contacts；Need progress sensor bandwidth low
When frequency lower limit is expanded, two metal bolts 6 of horizontal position can be distinguished its immediate conductive antenna arm tip and be welded with conducting wire
It connects in succession, you can realize the extension of conductive antenna arm.It preferably, in another embodiment, can be by following recommendation order pair
Built-in uhf sensor is assembled：The assembling of antenna body 1 and impedance transformer 2, antenna body 1 and metal cover board 14
Assembling, the installation of BNC connector 7 and metal cover board 14, the connection and fixation of double layer screen coaxial line 8, metal cover board 14 it is close
Envelope.After installation is complete, decide whether to be grasped using the prolongation structure of 1 bandwidth low-frequency minimum of antenna body again depending on being actually needed
Make.
A kind of assembling structure for monitoring built-in uhf sensor on-line for GIS partial discharge disclosed by the invention,
Suitable for a variety of uhf sensors based on microwave printed board type antenna, antenna body 1 can be used planar equiangular spiral antenna,
The sensor of Archimedes's antenna, log-periodic antenna or Hilbert parting antenna is built-in super including disc electrode type
High frequency sensors etc., while the microwave printed board type impedance transformer 2 of a variety of transition line forms can be used, such as index is asymptotic
Impedance transformer of line, hyperbolic asymptote and Chebyshev's asymptote form etc., therefore with certain versatility.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in previous embodiment or carry out equivalent replacement to which part technical characteristic；And
These modifications are replaced, the spirit and model of technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (10)
1. a kind of built-in uhf sensor assembling structure for GIS partial discharge on-line monitoring, it is characterised in that：It is wrapped
It includes and is fastened on GIS device cavity（20）On metal cover board（14）, pass through adjustable for height metal bolts（6）It is fixed on metal cover
Plate（14）The antenna body of inside（1）Antenna body is fixed on fitting（1）The impedance transformer of lower surface（2）；
The metal bolts（6）One end is fixed on antenna body（1）Non-conducting areas, the other end and the metal cover board
（14）Connection, length can need to choose to control the position of sensor according to installation；
The antenna body（1）On feed connection be equipped with conductive through hole（4）；
The impedance transformer（2）One end is equipped with protrusion（3）, the protrusion（3）Size and conductive through hole（4）Match and wear
Cross conductive through hole（4）Expose the antenna body（1）Front, the protrusion（3）In antenna body（1）It leads the both sides that front is exposed
Electric part and antenna body（1）Positive conductive antenna part is electrically connected；The impedance transformer（2）The other end be equipped with SMA
Connector（9）, the sub-miniature A connector（9）Through double layer screen coaxial line（8）BNC connector of the connection with hermetic seal technique（7）；
The metal cover board（14）It is equipped with and the BNC connector（7）The matched signal leadout hole of shape（11）, the BNC connects
Head（7）Sealing is fixed on the metal cover board（14）Signal leadout hole（11）In.
2. the built-in uhf sensor assembling structure according to claim 1 for GIS partial discharge on-line monitoring,
It is characterized in that：The conductive through hole（4）Be covered with the conductive strips being electrically connected with conductive antenna arm on madial wall, the conductive strips with
It is inserted into the conductive through hole（4）Protrusion（3）On current-carrying part be in close contact.
3. the built-in uhf sensor assembling structure according to claim 1 for GIS partial discharge on-line monitoring,
It is characterized in that：It further includes line card（10）, the double layer screen coaxial line（8）Pass through line card（10）It is fixed on adjacent metal
Bolt（6）On.
4. the built-in uhf sensor assembling structure according to claim 1 for GIS partial discharge on-line monitoring,
It is characterized in that：The impedance transformer（2）With antenna body（1）It is fixed between lower surface by heating glue connection.
5. the built-in uhf sensor assembling structure according to claim 1 for GIS partial discharge on-line monitoring,
It is characterized in that：The antenna body（1）With GIS device cavity（20）Inner surface can be realized and is arranged in parallel.
6. the built-in uhf sensor assembling structure according to claim 1 for GIS partial discharge on-line monitoring,
It is characterized in that：The metal cover board（14）On signal leadout hole（11）To take, the through-hole of lower concave station, concave station thereon（13-
1）The surface roughness of inside is not more than Ra1.6, lower concave station（13-2）The surface roughness of inside is not more than Ra3.2.
7. the built-in uhf sensor assembling structure according to claim 6 for GIS partial discharge on-line monitoring,
It is characterized in that：The metal cover board（14）The upper concave station of inside（13-1）Place is provided with for BNC connector（7）Joint sealing
Washer（22）, the metal cover board（14）The lower concave station in outside（13-2）Place is provided with for BNC connector（7）Fastening gasket and
Nut is fastened after the good nut in joint sealing washer（22）And metal cover board（14）It is smeared around the fastening gasket in outside
Fluid sealant.
8. the built-in uhf sensor assembling structure according to claim 1 for GIS partial discharge on-line monitoring,
It is characterized in that：The metal cover board（14）On be additionally provided with annular groove（15）, the annular groove（15）It is interior to be equipped with flange gasket
Circle（16）, and it is coated with sealing silicone grease.
9. the built-in uhf sensor assembling structure according to claim 1 for GIS partial discharge on-line monitoring,
It is characterized in that：In the antenna body（1）Non-conducting areas on be arranged with bolt hole（5）, the metal bolts（6）It is logical
Cross bolt hole（5）With the antenna body（1）It is fixedly connected.
10. the built-in uhf sensor assembling knot according to claim 9 for GIS partial discharge on-line monitoring
Structure, it is characterised in that：Each metal bolts（6）On close to antenna body（1）Both sides install additional plastic spacer（19）.
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| CN201610007907.XA CN105629142B (en) | 2016-01-05 | 2016-01-05 | For the built-in uhf sensor assembling structure of GIS partial discharge on-line monitoring |
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| CN111273142A (en) * | 2020-03-19 | 2020-06-12 | 上海电力大学 | Transformer partial discharge detection system |
| CN112540277B (en) * | 2020-11-15 | 2023-09-29 | 国网新疆电力有限公司乌鲁木齐供电公司 | GIS ultrahigh frequency partial discharge signal detection device for shielding external interference |
| CN112578244A (en) * | 2020-12-08 | 2021-03-30 | 广西电网有限责任公司电力科学研究院 | Method for evaluating internal defect discharge of GIS (gas insulated switchgear) by utilizing ultraviolet light |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202494693U (en) * | 2012-03-21 | 2012-10-17 | 黄峥 | Mounting device of GIS built-in ultra high frequency sensor |
| CN103176112A (en) * | 2013-03-28 | 2013-06-26 | 重庆大学 | Built-in ultrahigh frequency sensor for online detection of partial discharge of gas insulated switchgear |
| CN203164364U (en) * | 2013-04-23 | 2013-08-28 | 四川菲博斯科技有限责任公司 | GIS partial discharge monitoring device with built-in ultrahigh frequency sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0469577A (en) * | 1990-07-10 | 1992-03-04 | Meidensha Corp | Detector for local discharge in insulation gas |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202494693U (en) * | 2012-03-21 | 2012-10-17 | 黄峥 | Mounting device of GIS built-in ultra high frequency sensor |
| CN103176112A (en) * | 2013-03-28 | 2013-06-26 | 重庆大学 | Built-in ultrahigh frequency sensor for online detection of partial discharge of gas insulated switchgear |
| CN203164364U (en) * | 2013-04-23 | 2013-08-28 | 四川菲博斯科技有限责任公司 | GIS partial discharge monitoring device with built-in ultrahigh frequency sensor |
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