CN105629142A - Built-in ultrahigh frequency sensor assembling structure used for GIS partial discharge on-line monitoring - Google Patents
Built-in ultrahigh frequency sensor assembling structure used for GIS partial discharge on-line monitoring Download PDFInfo
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- CN105629142A CN105629142A CN201610007907.XA CN201610007907A CN105629142A CN 105629142 A CN105629142 A CN 105629142A CN 201610007907 A CN201610007907 A CN 201610007907A CN 105629142 A CN105629142 A CN 105629142A
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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 invention discloses a built-in ultrahigh frequency sensor assembling structure used for GIS partial discharge on-line monitoring, belonging to the GIS internal partial discharge on-line monitoring field. The built-in ultrahigh frequency sensor assembling structure comprises a metal cover plate buckled on the GIS equipment cavity, an antenna main body which is fixed on the inner side of the metal cover plate through a metal bolt with an adjustable height and an impedance transformer which is fixedly attached on the lower surface of the antenna main body; a feeder line connection portion in the front of the antenna main body is provided with a conduction through hole; one end of the impedance transformer is provided with a projection; the size of the projection is matched with the conduction through hole and is exposed in the front of the antenna main body through the conduction through hole; the other end of the impedance transformer is connected to a BNC connector with the air tight seal technology through an SMA connector and a double-layer shielding coaxial line; the metal cover plate is provided with a signal exporting hole matched with the shape of the BNS connector. The invention has advantages of small size, simple and easy installation, firm and reliable fixation, good airtightness, high accuracy impedance matching accuracy, and can realize the position adjustment of the sensor.
Description
Technical field
The present invention relates to the internal partial discharge monitoring field of GIS, be specifically related to a kind of built-in uhf sensor for GIS partial discharge on-line monitoring and assemble structure.
Background technology
GIS is few with maintenance workload, compact conformation, the plurality of advantages such as easy for installation, and at the main flow equipment progressively become in recent years during super extra-high voltage electric power system item is built, its reliability of operation increasingly receives the concern of people. Because of various factors such as manufacture, transport, assembled in situ, operation and Maintenance and Repair, inevitably there are some insulation defects producing to threaten to insulating properties in GIS, these defects often produce partial discharge phenomenon in early days. If the electrical insulation properties that shelf depreciation long-term existence can make GIS reduces, ultimately result in insulation fault. And adopting suitable method monitoring shelf depreciation GIS within is a kind of effective means judging GIS insulation long-term reliability, can find that potential danger is thus trouble-saving generation in early days in time. Therefore, it is achieved the on-line monitoring of the internal shelf depreciation of GIS, to preventing accident, improve utilization rate of equipment and installations, realize traditional " periodic inspection ", to the transformation of " repair based on condition of component ", there is important practical significance.
When GIS, in only small media range, of short duration partial breakdown occurs, the pulse current of a nanosecond can be produced. This pulse can motivate has hyperfrequency (UHF) with scope (300MHz-3GHz) the even electromagnetic wave of higher frequency composition, and spreads gradually from discharge source. And the cavity body structure of GIS can regard low-loss coaxial waveguide as, electromagnetic wave signal can be propagated therein effectively. UHF ratio juris is exactly utilize a ultrahigh frequency antenna sensor to receive this ultra-high frequency signal being excited by shelf depreciation steep-sided pulse and being propagated thus obtaining shelf depreciation for information about.
Office puts uhf sensor and is divided into built-in and external two kinds. Wherein external sensor have easy for installation, the feature such as be easy to carry about with one, but is subject to the impact of the interference such as outside corona, and it is more weak to receive signal. It addition, current GIS manufacturer commonly uses the insulator of metal flange parcel, this makes outer sensor cannot receive the electromagnetic wave from insulator leakage. When applying built-in uhf sensor, in pipeline, to reserve installation site in the GIS manufacture initial stage, and reception signal is guided to the external composition monitoring system of GIS, therefore have highly sensitive, be susceptible to the advantage such as external disturbance and running environment influence of noise.
But size sensor is caused a definite limitation by the internal limited space of GIS, and want strict guarantee gas tightness, this just requires to must take into sensor installation, signal lead-out wire hermetic seal and the sensor impact on the original Electric Field Distribution of cavity at the beginning of GIS designs, and adopts suitable sensor assembly method to obtain better application. Meanwhile, currently the resistance matching problem of sensor with transmission line is considered deficiency, cause that sensor output signal can not reflect discharge characteristic completely, really. Adopt impedance transformer to can solve the problem that the resistance matching problem in superwide range, but in the confined space, how to complete the installation of impedance transformer and fix and meet Practical Project requirement, be also one of problem demanding prompt solution. In previous methods, antenna body and impedance transformer what be connected by is prick hole on antenna body to wear the mode that copper conductor is welded to connect, though this method have passed through experiment and performance test, but connect firm not, do not meet the requirement of practical application, and manual welding spot size not easily controls, impedance matching influential effect is bigger. It addition, the ultrabroad band characteristic of sensor is premise and the necessary guarantee of Partial Discharge Detection diagnosis, and size sensor and bandwidth have direct relation. Being limited by GIS cavity space, existing built-in sensors (such as the most frequently used at present dish-type antenna) bandwidth is extremely limited, and the ultrabroad band how really realizing built-in sensors need to solve.
Based on above analysis, currently there is obvious deficiency in the installation of the built-in uhf sensor of partial discharge monitoring and application aspect, it is necessary to more reasonable, science and easily assembly method solve the problem in practical application.
Summary of the invention
The technical problem to be solved is to provide that a kind of size is little, it is simple to operation to install, fixation is reliable, air-tightness good, impedance matching precision is high, can realize sensing station regulates and has the built-in uhf sensor assembling structure for GIS partial discharge on-line monitoring of certain versatility and the suitability.
For solving the problems referred to above, the technical solution used in the present invention is:
Built-in uhf sensor for GIS partial discharge on-line monitoring assembles structure, its key technology be in that to include be fastened on GIS device cavity metal cover board, be fixed on the antenna body inside metal cover board by metal bolts and laminating is fixed on the impedance transformer of described antenna body lower surface; The side being provided with antenna body and impedance transformer on described metal cover board is installed in GIS device cavity; Described impedance transformer is between antenna body and metal cover board; 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 its other end is connected with described metal cover board;
Feed connection on described antenna body front is provided with conductive through hole, described conductive through hole medial wall is covered with and the conductive strips of described conductive antenna arm electric connection;
Described impedance transformer one end is provided with the length projection slightly above antenna body thickness, the size of described projection and conductive through hole match and are arranged in conductive through hole, insert from the back side of antenna body during assembling, the both sides current-carrying part that described projection is exposed in antenna body front directly welds connection with the conductive antenna arm of antenna body front feed connection respectively by scolding tin, it is to ensure that the basis of electrical connection, and the conductive strips in conductive through hole and the metal conduction portions close contact in described projection are for electrical connectivity and the further guarantee installing steadiness after inserting, described impedance transformer, by carrying out bonding with PUR with the back side of antenna body, further increases the steadiness that both connect, the other end of described impedance transformer is provided with sub-miniature A connector, and described sub-miniature A connector connects the BNC connector with hermetic seal technique through double layer screen coaxial line,
Described metal cover board is provided with the signal leadout hole with BNC connector form fit, and described BNC connector seals in the signal leadout hole being fixed on described metal cover board.
Further, the present invention its also include line card, described double layer screen coaxial line is fixed on adjacent metal bolts by line card.
Further, be connected by PUR between described impedance transformer with antenna body lower surface fixing.
Further, described antenna body is connected fixing with metal cover board through metal bolts, described metal bolts length can according to built-in uhf sensor in GIS device cavity fitting depth require and determine, it is possible to meet antenna body parallel with GIS device cavity inner surface relation is set.
Further, described metal cover board is additionally provided with cannelure, is provided with flange seal packing ring in described cannelure, and is coated with sealing silicone grease, it is achieved the sealing of metal cover board and GIS device cavity.
Further, being arranged with bolt hole on the non-conducting areas of described antenna body, one end of described metal bolts is connected by bolt hole and described antenna body are fixing, and each metal bolts adds plastic spacer in next-door neighbour antenna both sides.
Described metal cover board is provided with the installation counterbore corresponding with bolt hole position, the other end of described metal bolts is fixed on after adding spring shim, flat shim in the installation counterbore of metal cover board, it is achieved built-in uhf sensor and the assembling of metal cover board are with fixing.
Further, the signal leadout hole on described metal cover board is the scarce limit manhole with upper and lower concave station, and the surface roughness inside upper recess thereof platform is not more than Ra1.6, and the surface roughness inside its lower concave station is not more than Ra3.2.
Further, the joint sealing packing ring with the described BNC connector of sealing technology is contained in the upper concave station place being positioned at inside metal cover board, fastening gasket and the nut with the described BNC connector of sealing technology are contained in the lower concave station place being positioned at outside metal cover board, after the good described nut of fastening, around the fastening gasket outside joint sealing packing ring and metal cover board, smear fluid sealant.
Further, described metal cover board being additionally provided with installation through hole, described installation through hole is fastened by bolts with the flange on GIS device cavity.
Further, extend the needs of broad band low frequency lower limit according to built-in uhf sensor, when needs extend, the conductive antenna arm of described antenna body is electrically connected respectively through the described metal bolts that wire is its immediate. The conductive antenna arm of antenna body is electrically connected by present invention design respectively through the described metal bolts that wire is its immediate, extend the electric size of conductive antenna arm, under the premise not strengthening antenna body and impedance transformer size in limited GIS inner space, effectively reduce the low-frequency minimum of built-in uhf sensor.
Adopt and have the beneficial effects that produced by technique scheme:
(1) present invention efficiently solves under GIS field condition complex situations, the problem that antenna body is stably installed, and can pass through to regulate the size of the height adaptation site space of metal bolts; By arranging protruding and antenna body plug-in type assembling on impedance transformer, make both connections more firm, assemble easier; Owing to having conductive strips in the conductive through hole in antenna body, the current-carrying part making projection directly can contact with two strip antenna conductive arms of antenna body, by spot welding mode, both are directly welded again, further ensure the reliability of its electrical connection, so not only cast out wire transition portion, avoid when wire connects the shortcoming that junction point is insecure, welding spot size is not easily grasped, eliminate the adverse effect to impedance matching, and welding sequence has been greatly facilitated and simplified while improving assembling fastness, reduce the impact of welding difficulty and manual welding.
(2) present invention controls antenna body position in GIS device cavity by adjusting the length of metal bolts, and the surface making antenna body is substantially parallel with GIS device cavity inner surface, thus reducing the impact on original field distribution; Employing metal bolts is fixed, it is ensured that the stability that antenna body is installed, it is possible to resist a degree of external mechanical vibrations; Antenna both sides adopt plastic spacer and metal bolts fastening, it is ensured that protect antenna face not to be destroyed when fastening between conductive antenna part and said metal bolt while insulating properties.
(3) present invention adopts and has the BNC connector of hermetic seal technique and achieve and drawn by the signal of impedance transformer, and devise the double shield measure to gas tightness, namely the signal leadout hole of metal cover board surface treatment considered critical is designed and is adopted the sealing structure that sealing ring, fastening gasket combine with fluid sealant; Design has the signal leadout hole of upper and lower concave station, and is placed in inside metal cover board by BNC connector mounting flange and joint sealing circle, makes sealing surface sink to obtaining protection, prevents BNC connector generation of unexpected ejection under internal hyperbar simultaneously.
(4) present invention is provided with line card, is fixed on adjacent metal bolts by the middle part line card of double layer screen coaxial line, can be prevented effectively from cause because of external shock or other factors coaxial line displacement, rock and the fault such as joint looseness.
Accompanying drawing explanation
In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, the accompanying drawing used required in detailed description of the invention or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of side of the present invention broken section.
Fig. 2 is middle impedance changer of the present invention is side view during index asymptote.
Fig. 3 is that in the present invention, antenna body is front plan view during planar equiangular spiral antenna.
Fig. 4 is the S11 measured curve under wire connection also adhesion without adhesiver and through hole connection gluing two kinds of situations of the built-in uhf sensor for GIS partial discharge on-line monitoring.
Wherein, the grid shadow in Fig. 1 ~ Fig. 3 represents that current-carrying part, diagonal line hatches represent the section in sectional view.
Wherein, 1 antenna body, 2 impedance transformers, 3 projections, 4 conductive through holes, 5 bolts hole, 6 metal bolts, 7BNC joint, 8 double layer screen coaxial lines, 9SMA joint, 10 line cards, 11 signal leadout holes, 12 concave station under counterbore, the upper concave station of 13-1,13-2,14 metal cover boards, 15 cannelures, 16 flange seal packing rings, 17 spring shims, 18 flat shims, 19 plastic spacers, 20GIS equipment cavity, 21 installation through hole, 22 joint sealing packing rings are installed.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing 1-4 and specific embodiment, invention is carried out clear, complete description.
As shown in Fig. 1 ~ Fig. 3, the present embodiment include be fastened on GIS device cavity 20 metal cover board 14, be fixed on the antenna body 1 inside metal cover board 14 by metal bolts 6 and laminating is fixed on the impedance transformer 2 of described antenna body 1 lower surface; Described built-in uhf sensor includes antenna body 1, impedance transformer 2 and sub-miniature A connector 9; The side being provided with antenna body 1 and impedance transformer 2 on described metal cover board 14 is installed in GIS device cavity 20; Described impedance transformer 2 is between antenna body 1 and metal cover board 14;
Described metal bolts 6 one end is fixed on the non-conducting areas of antenna body 1, and its other end is connected with described metal cover board 14;
Feed connection on described antenna body 1 front is provided with conductive through hole 4, described conductive through hole 4 medial wall is covered with and the conductive strips of described conductive antenna arm electric connection;
Described impedance transformer 2 one end is provided with the length projection 3 slightly above antenna body 1 thickness, the described size of protruding 3 and conductive through hole 4 match and are arranged in conductive through hole 4, insert from the back side of antenna body 1 during assembling, metal conduction portions on conductive strips and described protruding 3 close contact after insertion, the described protruding 3 both sides current-carrying parts exposed in antenna body 1 front directly weld connection with the two strip antenna conductive arms in antenna body 1 front respectively by scolding tin, it is to ensure that the key of electrical connection, and the conductive strips in conductive through hole 4 and described protruding 3 electrical contacts are the many one layer of guarantees for electric connection, described impedance transformer 2, by carrying out bonding with PUR with the back side of antenna body 1, further increases the steadiness that both connect, the other end of described impedance transformer 2 is provided with sub-miniature A connector 9, and described sub-miniature A connector 9 connects the BNC connector 7 with hermetic seal technique through double layer screen coaxial line 8,
Described metal cover board 14 is provided with and the signal leadout hole 11 of BNC connector 7 form fit, and described BNC connector 7 seals in the signal leadout hole 11 being fixed on described metal cover board 14.
Further, the present invention its also include line card 10, described double layer screen coaxial line 8 is fixed on adjacent metal bolts 6 by line card 10.
Further, be connected by PUR between described impedance transformer 2 with antenna body 1 lower surface fixing.
Further, described antenna body 1 is connected fixing with metal cover board 14 through metal bolts 6, described metal bolts 6 length can according to built-in uhf sensor in GIS device cavity 20 fitting depth require and determine, it is possible to meet antenna body 1 parallel with GIS device cavity 20 inner surface relation is set.
Further, described metal cover board 14 is additionally provided with cannelure 15, is provided with flange seal packing ring 16 in described cannelure, and is coated with sealing silicone grease, it is achieved the sealing of metal cover board 14 and GIS device cavity 20.
Further, being arranged with bolt hole 5 on the non-conducting areas of described antenna body 1, one end of described metal bolts 6 is connected by bolt hole 5 is fixing with described antenna body 1, and each metal bolts 6 adds plastic spacer 19 in next-door neighbour antenna both sides.
Described metal cover board 14 is provided with the installation counterbore 12 corresponding with bolt hole 5 position, the other end of described metal bolts 6 is fixed in the installation counterbore 12 of metal cover board 14 after adding spring shim 17, flat shim 18, it is achieved built-in uhf sensor and the assembling of metal cover board 14 are with fixing.
Further, the signal leadout hole 11 on described metal cover board 14 is the scarce limit manhole with upper and lower concave station, and the surface roughness inside upper recess thereof platform 13-1 is not more than Ra1.6, and the surface roughness inside its lower concave station 13-2 is not more than Ra3.2.
Further, the joint sealing packing ring 22 with the described BNC connector 7 of sealing technology is contained in the upper concave station 13-1 place being positioned at inside metal cover board 14, fastening gasket and the nut with the described BNC connector 7 of sealing technology are contained in the lower concave station 13-2 place being positioned at outside metal cover board 14, after having fastened nut, around the fastening gasket outside joint sealing packing ring 22 and metal cover board 14, smear fluid sealant.
Further, described metal cover board 14 being additionally provided with installation through hole 21, described installation through hole 21 is fastened by bolts with GIS device cavity 20.
Further, extend the needs of broad band low frequency lower limit according to built-in uhf sensor, when needs extend, two strip antenna conductive arms of described antenna body 1 are electrically connected respectively through the described metal bolts 6 that wire is its immediate.
The present embodiment includes assembling and the installation of fixing, BNC connector 7 and metal cover board 14 and sealing, the connecting and sealing fixing, between metal cover board 14 and GIS device cavity 20 of double layer screen coaxial line 8 of the assembly welding of antenna body 1 and impedance transformer 2 and fixing, built-in uhf sensor and metal cover board 14, and the structure of expanding built-in formula uhf sensor bandwidth low-frequency minimum if desired, specifically, said structure includes following content:
(1) in the present embodiment, built-in uhf sensor includes planar equiangular spiral antenna, impedance transformer 2 and sub-miniature A connector 9, and its bandwidth is 700MHz-3GHz; Namely antenna body 1 have employed planar equiangular spiral antenna, overall employing plane equiangular spiral structure; The microwave sheet material that planar equiangular spiral antenna is covered copper by one side is processed into; Described planar equiangular spiral antenna electrically connects with one end of impedance transformer 2, and the other end and the sub-miniature A connector 9 of impedance transformer 2 electrically connect.
The welding assembly of described planar equiangular spiral antenna and impedance transformer 2 and fixed structure, including the rectangular preiection 3 slightly above planar equiangular spiral antenna thickness of one length of lateral layout in impedance transformer 2 one end, and the feed connection at planar equiangular spiral antenna two-arm center is offered the rectangular conductive through hole 4 that more above-mentioned rectangular preiection 3 cross section is slightly larger, lay, in conductive through hole 4 inwall both sides, the metal conductor tracks being connected with conductive antenna arm respectively simultaneously. During assembling, the projection 3 on impedance transformer 2 is inserted into conductive through hole 4 from the planar equiangular spiral antenna back side, both current-carrying parts are made directly welding connection by the impedance transformer 2 both sides scolding tin exposed in planar equiangular spiral antenna front, in the both sides that planar equiangular spiral antenna back side hot-melt connects with planar equiangular spiral antenna in impedance transformer 2 main part, it is achieved the impedance transformer 2 welding assembly on planar equiangular spiral antenna is with fixing; In other words, one end of impedance transformer 2 is curved after being connected with planar equiangular spiral antenna, sweep is substantially parallel with described planar equiangular spiral antenna place plane, and two conductive antenna arms of planar equiangular spiral antenna are electrically connected with impedance transformer 2 by the perforation on microwave sheet material.
(2) the assembling fixed structure of described built-in uhf sensor and metal cover board 14, including: adopting metal bolts 6 to be connected with metal cover board 14 by built-in uhf sensor and fixing, the length of metal bolts 6 is determined according to planar equiangular spiral antenna fitting depth requirement in GIS device cavity 20; In planar equiangular spiral antenna front without on the position of current-carrying part, symmetrical 4 bolts hole 5 of design, its aperture and above-mentioned metal bolts 6 diameter adapt; Metal cover board 14 also designs the installation counterbore 12 of 4 same sizes in same location. First metal bolts 14 is through on the bolt hole 5 of planar equiangular spiral antenna during assembling, each metal bolts 6 adds plastic spacer 19 in next-door neighbour planar equiangular spiral antenna both sides, it is fixed in the installation counterbore 12 of metal cover board 14 after more each metal bolts 6 being added spring shim 17, flat shim 18, it is achieved planar equiangular spiral antenna and the assembling of metal cover board 14 are with fixing.
(3) installation of BNC connector described in 7 and metal cover board 14 with seal structure, including adopting the BNC connector 7 with hermetic seal technique, be fixed on the signal leadout hole 11 of metal cover board 14. Described metal cover board 14 center is the scarce limit manhole of concave station 13-1 and lower concave station 13-2 on the band of both sides, and its aperture and BNC connector 7 size adapt. On metal cover board 14, inside concave station 13-1, surface roughness near installing hole is not more than Ra1.6, and outside 14 times concave station 13-2 of metal cover board, the surface roughness near installing hole is not more than Ra3.2. During assembling, the joint sealing packing ring 22 of BNC connector 7 is loaded on inside metal cover board 14, the fastening gasket of BNC connector 7 and nut are loaded on outside, after having fastened nut, around fastening gasket outside joint sealing packing ring 22 and metal cover board 14, smear fluid sealant.
(4) connection of described double layer screen coaxial line 8 and fixed structure, including the double layer screen coaxial line 8 adopting two ends respectively SMA terminal and BNC terminal, it is respectively connecting to its two ends join the BNC connector 7 on the impedance transformer 2 of sub-miniature A connector 9 and metal cover board 14, the middle part line card 10 of double layer screen coaxial line 8 is fixed on adjacent metal bolts 6; The input impedance of described double layer screen coaxial line 8 is 50 ��, and the input impedance of planar equiangular spiral antenna is transformed to 50 �� by impedance transformer 2 by 135 ��.
(5) the sealing structure of described metal cover board 14, offers cannelure 15 on the flange of metal cover board 14 including adopting, puts into flange seal packing ring 16, and smear sealing silicone grease in cannelure 15.
(6) described built-in uhf sensor expands the structure of bandwidth low-frequency minimum, this structure is optional structure, not necessarily structure, it includes adopting wire to be connected with the metal bolts 6 of next-door neighbour respectively by the two of planar equiangular spiral antenna conductive antenna arms, thus the electric size of extension antenna conductive arm. During operation, wire one end is welded on the tip of a conductive antenna arm, the other end is wound on the metal bolts 6 of next-door neighbour and tightening nut is fixed, two such conductive antenna arm just links together with metal bolts 6 and GIS device cavity 20, it is achieved that expanding and the prolongation of electricity size of conductive antenna arm.
In conjunction with accompanying drawing 1 ~ Fig. 4, by following rationale, patent of the present invention is done more detailed description.
In order to receive the local discharge signal in SHF band scope (300MHz-3GHz), the antenna body 1 as uhf sensor also must possess ultra-wide band scope. And so in broad frequency range, the input impedance of antenna body 1 is not changeless, and differ farther out with the impedance of conventional coaxial transmission line, it is therefore desirable to adopt impedance transformer 2 to realize mating of antenna body 1 and transmission line, it is to avoid generation signaling reflex and return loss. Actual GIS field condition is complicated, and operating equipment can be attended by certain mechanical vibration, and this just requires that firm is wanted in the connection of impedance transformer 2 and antenna body 1, and under the premise ensureing performance, installation method is wanted easy, electrically connected and want reliable simultaneously. The welding assembly of antenna body disclosed in the present invention 1 and impedance transformer 2 is with fixing means as shown in Figure 1, one installation rectangular preiection 3 of one end design of antenna body 1 is connected at the impedance transformer 2 shown in Fig. 2, impedance transformer 2 and antenna body 1 are designed for insertion into formula assemble, make both connections more firm; Simultaneously because be equipped with metal conductor tracks inside the conductive through hole 4 at antenna body 1 center so that after insertion, both current-carrying parts can directly contact, then by spot welding mode, both are directly welded, further ensure the reliability of electrical connection. So not only cast out wire transition portion, and welding sequence has been greatly facilitated and simplified, it is to avoid the shortcoming that wire connects. It addition, by carrying out bonding by impedance transformer 2 with antenna body 1 with PUR, further increase the steadiness that both connect. The built-in uhf sensor connected by wire and the built-in uhf sensor adopting through hole connection blend compounds viscous carry out the contrast of S11 parameter testing, and result is as shown in Figure 4. It can be seen that gluing fixing rear S11 curve has minor shifts to the left, but the bandwidth change meeting S11 <-10dB is little. As can be seen here, antenna performance impact can be ignored by the welding assembly of this antenna body 1 and impedance transformer 2 with fixing means, is feasible.
A built-in uhf sensor major issue when mounted, it is simply that avoid Electric Field Distribution original in cavity is impacted. The built-in uhf sensor of present invention design and the assembling fixing means of metal cover board 14, adopt 4 metal bolts 6 to achieve antenna body 1 with the connection of metal cover board 14 with fixing, as shown in Figure 1. The antenna body 1 position in GIS cavity can be controlled by the length of adjustment metal bolts 6, make antenna body 1 surface substantially parallel with GIS cavity inner surface, thus reducing the impact on original field distribution. 4 position of mounting hole on antenna body 1 front and metal cover board, select antenna body 1 front without the region of current-carrying part, specifically can determine according to actual antennas body 1 form. Owing to have employed the fastening means that nut coordinates with plastic spacer 19, spring shim 17 and flat shim 18, it is ensured that the stability that antenna body 1 is installed, it is possible to resist a degree of external mechanical vibrations. Antenna both sides adopt plastic spacer and metal bolts fastening, it is possible to ensure that between conductive antenna part and said metal bolt, while insulating properties, protection antenna face is not destroyed when fastening.
Under the premise ensureing hermetic seal, antenna body 1 signal is led to GIS containment portion, be also the major issue that have to solve during built-in uhf sensor is installed. The holding wire of present invention design draws installation and the encapsulating method of joint and metal cover board 14, and the BNC connector 7 to have hermetic seal technique achieves the extraction of antenna body 1 signal, and devises the double shield measure to gas tightness, as shown in Figure 1. Wherein, the BNC connector 7 with sealing technology must meet, indispensable. Length according to BNC connector 7 and shape of cross section and size at metal cover board 14 center; process both sides with shallow upper concave station 13-1, lower concave station 13-2 scarce limit manhole as signal leadout hole 11; for fixing BNC connector 7, the two ends of BNC connector 7 can be played a protective role by the upper concave station 13-1 of its both sides, lower concave station 13-2 in handling process. Be not more than Ra1.6 according to the inside surface roughness near signal leadout hole 11, outer surface roughness is not more than the requirement of Ra3.2 and is processed, ensure the sealing of metal cover board 14 surface treatment by restricting the signal leadout hole processing technique of surface roughness, this is first heavily ensure. Using metal cover board 14 inner surface as sealing surface during assembling, place the joint sealing packing ring 22 of BNC connector 7, fastening gasket and the nut of outer surface placement BNC connector 7 fasten, fluid sealant is smeared around fastening gasket outside joint sealing packing ring 22 and metal cover board 14 after fastening, being further ensured that gas tightness, this is second heavily ensure. Design has the signal leadout hole of upper and lower concave station, and is placed in inside metal cover board by BNC connector mounting flange and joint sealing circle, makes sealing surface sink to obtaining protection, prevents BNC connector generation of unexpected ejection under internal hyperbar simultaneously.
The connection of the holding wire of present invention design and fixed structure, adopt the double layer screen coaxial line 8 of two ends respectively SMA terminal and BNC terminal, connect the BNC connector 7 on the impedance transformer 2 and metal cover board 14 of joining sub-miniature A connector 9, thus establishing the extraction channel of antenna body 1 signal, as shown in Figure 1. It addition, be fixed on adjacent metal bolts 6 by the middle part line card 10 of double layer screen coaxial line 8, it is to avoid the double layer screen coaxial line 8 caused because of external shock or other factors shifts, rocks, and sub-miniature A connector 9 and BNC connector 7 such as loosen at the fault.
The sealing structure of the metal cover board 14 of present invention design, offers cannelure 15 including adopting on metal cover board 14 flange, puts into flange seal packing ring 16 and smears the method sealing silicone grease, ensure the sealing of metal cover board 14, as shown in Figure 1 in cannelure 15.
By microwave technology principle it can be seen that antenna body 1 full-size is directly connected to the scope that can receive electromagnetic wavelength, thus determining the low-frequency minimum of antenna body 1 bandwidth. And it being limited to space limited inside GIS, antenna body 1 general size can not be excessive. The antenna body 1 bandwidth low-frequency minimum expanding method of present invention design, is welded on an antenna arm tip by wire one end, and the other end is wound on the metal bolts 6 of next-door neighbour and tightening nut is fixed. Because metal bolts 6 is connected with GIS device cavity 20, so that two-arm and metal bolts 6 and the GIS device cavity 20 of conductive antenna arm link together, extend the electric size of conductive antenna arm. Testing through reality, this structure can make the S11 curve near-10dB occur being decreased obviously, thus effectively reducing the low-frequency minimum of antenna body 1.
Preferably, in another embodiment, to adopt equiangular spiral antenna as the uhf sensor of antenna body 1, the design of conductive through hole 4 position is carried out, as shown in Figures 2 and 3. The wherein part outside conductive through hole 4 region, for the two-arm of equiangular spiral antenna. Under original state, metal bolts 6 not with two arm contact; Need to carry out sensor bandwidth low-frequency minimum when expanding, conductive antenna arm tip wire its immediate respectively for the two of horizontal level metal bolts 6 can be welded to connect, the prolongation of conductive antenna arm can be realized.
Preferably, in another embodiment, by following recommendation order, built-in uhf sensor can be assembled: the assembling of antenna body 1 and impedance transformer 2, the assembling of antenna body 1 and metal cover board 14, the installation of BNC connector 7 and metal cover board 14, the connection of double layer screen coaxial line 8 with fixing, the sealing of metal cover board 14. After installation, it is operated depending on being actually needed the prolongation structure deciding whether to adopt antenna body 1 bandwidth low-frequency minimum again.
A kind of assembling structure for the built-in uhf sensor of GIS partial discharge on-line monitoring disclosed by the invention, suitable in the multiple uhf sensor based on microwave printed board type antenna, antenna body 1 can adopt planar equiangular spiral antenna, Archimedes's antenna, the sensor of log-periodic antenna or Hilbert typing antenna, including built-in uhf sensor of disc electrode type etc., the microwave printed board type impedance transformer 2 of multiple transition line form can be adopted simultaneously, such as index asymptote, impedance transformer of hyperbolic asymptote and Chebyshev's asymptote form etc., therefore there is certain versatility.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit; Although the present invention being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in previous embodiment still can be modified by it, or wherein portion of techniques feature is carried out equivalent replacement; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technical scheme.
Claims (10)
1. the built-in uhf sensor assembling structure for GIS partial discharge on-line monitoring, it is characterised in that: it is included the metal cover board (14) being fastened on GIS device cavity (20), the antenna body (1) being fixed on metal cover board (14) inner side by adjustable for height metal bolts (6) and laminating and is fixed on the impedance transformer (2) of antenna body (1) lower surface;
Described metal bolts (6) one end is fixed on the non-conducting areas of antenna body (1), and its other end is connected with described metal cover board (14), and length can need to choose thus controlling the position of sensor according to installing;
Feed connection on described antenna body (1) front is provided with conductive through hole (4);
Described impedance transformer (2) one end is provided with projection (3), the size of described projection (3) and conductive through hole (4) match and expose described antenna body (1) front through conductive through hole (4), the conductive antenna part electric connection in the both sides current-carrying part that described projection (3) is exposed in antenna body (1) front and antenna body (1) front; The other end of described impedance transformer (2) is provided with sub-miniature A connector (9), and described sub-miniature A connector (9) connects the BNC connector (7) with hermetic seal technique through double layer screen coaxial line (8);
Described metal cover board (14) is provided with the signal leadout hole (11) with described BNC connector (7) form fit, and described BNC connector (7) seals in the signal leadout hole (11) being fixed on described metal cover board (14).
2. the built-in uhf sensor for GIS partial discharge on-line monitoring according to claim 1 assembles structure, it is characterized in that: be covered with on described conductive through hole (4) medial wall and the conductive strips of described conductive antenna arm electric connection, described conductive strips are in close contact with the current-carrying part in the projection (3) inserting described conductive through hole (4).
3. the built-in uhf sensor for GIS partial discharge on-line monitoring according to claim 1 assembles structure, it is characterized in that: it also includes line card (10), and described double layer screen coaxial line (8) is fixed on adjacent metal bolts (6) by line card (10).
4. the built-in uhf sensor for GIS partial discharge on-line monitoring according to claim 1 assembles structure, it is characterised in that: it is connected fixing between described impedance transformer (2) with antenna body (1) lower surface by PUR.
5. the built-in uhf sensor for GIS partial discharge on-line monitoring according to claim 1 assembles structure, it is characterised in that: described antenna body (1) and GIS device cavity (20) inner surface are capable of be arrangeding in parallel.
6. the built-in uhf sensor for GIS partial discharge on-line monitoring according to claim 1 assembles structure, it is characterized in that: the signal leadout hole (11) on described metal cover board (14) is the through hole with upper and lower concave station, the surface roughness of upper recess thereof platform (13-1) inner side is not more than Ra1.6, and the surface roughness of its lower concave station (13-2) inner side is not more than Ra3.2.
7. the built-in uhf sensor for GIS partial discharge on-line monitoring according to claim 6 assembles structure, it is characterized in that: upper concave station (13-1) place of described metal cover board (14) inner side is provided with the joint sealing packing ring (22) for BNC connector (7), lower concave station (13-2) place in described metal cover board (14) outside is provided with the fastening gasket for BNC connector (7) and nut, smears fluid sealant after the good described nut of fastening around the fastening gasket in joint sealing packing ring (22) and metal cover board (14) outside.
8. the built-in uhf sensor for GIS partial discharge on-line monitoring according to claim 1 assembles structure, it is characterized in that: described metal cover board (14) is additionally provided with cannelure (15), it is provided with flange seal packing ring (16) in described cannelure (15), and is coated with sealing silicone grease.
9. the built-in uhf sensor for GIS partial discharge on-line monitoring according to claim 1 assembles structure, it is characterized in that: be arranged with bolt hole (5) on the non-conducting areas of described antenna body (1), described metal bolts (6) is connected by bolt hole (5) and described antenna body (1) are fixing.
10. the built-in uhf sensor for GIS partial discharge on-line monitoring according to claim 9 assembles structure, it is characterised in that: the both sides being close to antenna body (1) on each described metal bolts (6) install plastic spacer (19) additional.
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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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111273142A (en) * | 2020-03-19 | 2020-06-12 | 上海电力大学 | Transformer partial discharge detection system |
| CN112540277A (en) * | 2020-11-15 | 2021-03-23 | 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 capable of 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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| 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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| JPH0469577A (en) * | 1990-07-10 | 1992-03-04 | Meidensha Corp | Detector for local discharge in insulation gas |
| CN202494693U (en) * | 2012-03-21 | 2012-10-17 | 黄峥 | Mounting device of GIS built-in ultra high frequency sensor |
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Cited By (4)
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| CN111273142A (en) * | 2020-03-19 | 2020-06-12 | 上海电力大学 | Transformer partial discharge detection system |
| CN112540277A (en) * | 2020-11-15 | 2021-03-23 | 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 capable of shielding external interference |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105629142B (en) | 2018-06-29 |
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