CN101782603B - Flat-plate VFTO measuring sensor - Google Patents
Flat-plate VFTO measuring sensor Download PDFInfo
- Publication number
- CN101782603B CN101782603B CN 201010119127 CN201010119127A CN101782603B CN 101782603 B CN101782603 B CN 101782603B CN 201010119127 CN201010119127 CN 201010119127 CN 201010119127 A CN201010119127 A CN 201010119127A CN 101782603 B CN101782603 B CN 101782603B
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- hand hole
- cover plate
- plate
- hole cover
- metal shielding
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- 239000002184 metal Substances 0.000 claims abstract description 52
- 229910052751 metal Inorganic materials 0.000 claims abstract description 52
- 238000009413 insulation Methods 0.000 claims abstract description 28
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 238000012856 packing Methods 0.000 claims description 12
- 239000003822 epoxy resin Substances 0.000 claims description 10
- 229920000647 polyepoxide Polymers 0.000 claims description 10
- 238000009795 derivation Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 abstract description 6
- 230000007774 longterm Effects 0.000 abstract description 5
- 239000011888 foil Substances 0.000 abstract 3
- 239000003990 capacitor Substances 0.000 description 13
- 238000009434 installation Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910018503 SF6 Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 2
- 229960000909 sulfur hexafluoride Drugs 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Images
Classifications
-
- 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
- H02B13/0356—Mounting of monitoring devices, e.g. current transformers
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a flat-plate VFTO measuring sensor, which comprises a GIS shell hand hole, a hand hole cover plate, a sealing medium plate, two sealing washers, a metal shielding plate, a metal foil, an insulation film, a lead-out wire and a matching resistor. The middle of the hand hole cover plate is provided with a hole, the hand hole cover plate covers the GIS shell handle hole and is fixed, and a first sealing washer is arranged between the hand hole cover plate and the GIS shell hand hole; the sealing medium plate covers an inner side hole of the hand hole cover plate and is fixed, and a second sealing washer is arranged between the sealing medium plate and the hand hole cover plate; the metal shielding plate is arranged inside the hole on the hand hole cover plate, the insulation film is attached on the surface of the metal shielding plate, which is opposite to the sealing medium plate, and the metal foil is attached onto the insulation film; and the matching resistor is connected with the metal foil through the lead-out wire. By disassembling the metal shielding plate, the sensor is convenient to be replaced or examined, the replacement and the examination of the sensor can be operated on the spot without shutting down the electric grid, and the long-term on-line detection running can be realized.
Description
Technical field
The present invention relates to electric equipment insulation detection range, more particularly, relate to a kind of flat-plate VFTO measuring sensor.
Background technology
GIS (Gas Insulated Switchgear; Gas insulated transformer substation) when carrying out routine operation, can produce VFTO (Very Fast Transient Voltage, fast transient overvoltage), its voltage magnitude is higher; Rising edge is steeper, and the safe operation of electric system is had bigger harm.It is more to be used for VFTO measured sensor type at present, and flat-plate VFTO measuring sensor is other survey sensor relatively, and himself stray inductance is little, and it is high to measure bandwidth, more and more receives domestic and international experts and scholars' attention.
Need be filled with sulfur hexafluoride (SF6) gas of certain pressure in the pipeline during GIS operation, and need to guarantee the impermeability of GIS pipeline.Present existing flat-plate VFTO measuring sensor; In actual use, can not guarantee the impermeability of GIS when dismounting or sensor installation, when therefore in changing or overhauling, needing the installation or removal sensor; Electrical network needs to have a power failure, and can't realize the online detection operation that electrical network is long-term.
Summary of the invention
For solving the problems of the technologies described above, the present invention provides a kind of flat-plate VFTO measuring sensor, and the scene of can realizing does not easily need grid power blackout to sensor dismounting or installation, has realized the online detection operation that electrical network is long-term.
The embodiment of the invention is achieved in that
A kind of flat-plate VFTO measuring sensor comprises: gas insulated transformer substation GIS housing hand hole, hand hole cover plate, sealing medium plate, first packing washer, second O-ring seal, metal shielding board, metal forming, insulation film, extension line and build-out resistor,
Wherein said hand hole cover plate has middle perforate, covers on the said GIS housing hand hole, fixes with said GIS housing hand hole, is provided with first packing washer between the two;
Said sealing medium plate covers on the inboard aperture of said hand hole cover plate, and fixes with said hand hole cover plate, is provided with second packing washer between the two;
Said metal shielding board is arranged in the middle perforate of said hand hole cover plate, fixes with said hand hole cover plate;
Said metal forming is attached on the said insulation film, and said insulation film is attached on said metal shielding board and the said sealing medium plate opposed inside face;
Said build-out resistor one end is connected on the said metal forming through deriving line, and the other end is as deriving end.
Preferably, the fixed form of said hand hole cover plate and GIS housing hand hole, said hand hole cover plate and sealing medium plate, said hand hole cover plate and metal shielding board adopts bolt.
Preferably, further comprise shield opening, insulation sleeve and joint,
Wherein said shield opening is located at the center of shielded metal plate, and the inwall of said shield opening is provided with said insulation sleeve, and said joint is fixed on said shield opening outer openings place.
Preferably, said build-out resistor is arranged in the insulation sleeve in the said shield opening with the derivation line, and the derivation end of said build-out resistor is connected with said joint.
Preferably, said sealing medium plate is an epoxy resin board.
Preferably, the thickness of said epoxy resin board is not less than 25mm.
Can find out that by above-mentioned technical scheme the sensor of the application embodiment is through the packing washer that is provided with between hand hole cover plate and GIS housing bore, sealing medium plate and the hand hole cover plate; Make metal shielding board to dismantle at any time, and dismantle metal shielding board, can not influence the impermeability of GIS; So when network operation; Just can dismantle or sensor installation behind the dismounting metal shielding board, convenient scene is changed or is overhauled sensor, realizes the long-term online detection operation of electrical network.In addition, build-out resistor is arranged in the middle aperture of metal shielding board with the derivation line, by shielding preferably, has reduced the influence of outside electromagnetic interference.The area size that can also be through regulating metal forming and the thickness of insulation film are regulated the intrinsic standoff ratio of sensor, make Sensor Design more flexible.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is one embodiment of the present of invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the fundamental diagram of flat-plate VFTO measuring sensor;
Fig. 2 is a kind of flat-plate VFTO measuring sensor center cross-sectional figure of the embodiment of the invention;
Fig. 3 is the center cross-sectional figure of shield opening on the embodiment of the invention metal shielding board.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, the present invention is made further detailed description below in conjunction with accompanying drawing.
Consult the fundamental diagram of Fig. 1 flat-plate VFTO measuring sensor, the principle of work of VFTO is the capacitive divider principle, and shown in Fig. 1,110 is the high voltage equipment that will detect, and 120 is the working sensor part, and 130 is checkout equipment.Working sensor part 120 comprises: high-voltage arm capacitor C 1, low-voltage arm capacitor C 2 and build-out resistor R, checkout equipment 130 is used for detecting the voltage of low-voltage arm capacitor C 2.In working sensor part 120; Low-voltage arm capacitor C 2 one end ground connection, the other end is connected with high-voltage arm capacitor C 1, is concatenated on the high voltage equipment 110 after two capacitances in series again; Build-out resistor R one end is drawn from two electric capacity intermediate connection points, and the other end is guided to checkout equipment.Checkout equipment 130 is total to earth potential with low-voltage arm capacitor C 2.
As shown in Figure 1, the high-voltage arm capacitor C 1 and the low-voltage arm capacitor C 2 of working sensor part 120 have constituted capacitive divider, and establishing high voltage equipment voltage is U, and the voltage of low-voltage arm capacitor C 2 is U
C2, the intrinsic standoff ratio of capacitive divider is K.Voltage U=the K*U of high-tension apparatus then
C2In the working sensor process, measure the voltage U of low-voltage arm capacitor C 2 through checkout equipment 130
C2, can calculate the voltage U of high voltage equipment.
Consult the center cross-sectional figure of a kind of flat-plate VFTO measuring sensor of Fig. 2 embodiment of the invention; Dull and stereotyped VFTO survey sensor comprises: GIS housing hand hole 1, hand hole cover plate 2, epoxy resin board 3, extension line 4, the first packing washer 5a, the second packing washer 5b, set bolt 6, metal shielding board 7, shield opening 8, metal forming 9, insulation film 10, build-out resistor 11, insulating sheath 12 and BNC (Bayonet Nut Connector, bayonet nut connector) joint 13.
In the present embodiment, hand hole cover plate 2 is circular, and center drilling covers on the GIS housing hand hole 1, and is fixing tight with GIS housing hand hole 1 with set bolt 6, is added with packing washer 5a between them.Epoxy resin board 3 covers on the inboard aperture of hand hole cover plate 2, and is also fixing tight with bolt 6, is added with packing washer 5b between them.Metal shielding board 7 is a circular slab, is placed on just in hand hole cover plate 2 interstitial holes, and is fixing with hand hole cover plate 2 with bolt 6.Shown in the center cross-sectional figure of shield opening on Fig. 3 embodiment of the invention sheet metal, shielding shield opening 8 is arranged on the center of metal shielding board, and the hole inwall is stained with insulating coating 12, and BNC connector 13 is installed in the shield opening collar extension.Metal forming 9 is attached on the insulation film 10, and insulation film 10 is attached on metal shielding board 7 and the epoxy resin board 3 opposed inside faces.Build-out resistor 11 1 ends are welded on the derivation line 4, and derivation line 4 passes insulation film 10 and is connected on the metal forming 9, and the other end is welded on the BNC connector 13 as deriving end, and build-out resistor 11 is placed in the insulation sleeve 11 in the shield opening with derivation line 4.
Can know that by Fig. 1 flat-plate VFTO measuring sensor is based on the sensor of capacitive divider principle.With respect to working sensor part 120 shown in Figure 1; As shown in Figure 2 in the present embodiment, the stray capacitance between metal forming 9 and the GIS centre pilot (not shown among Fig. 2) can constitute the high-voltage arm capacitor C 1 of capacitive divider, and metal forming 9 can constitute low-voltage arm capacitor C 2 jointly with metal shielding board 7 and insulation film 10; The three just can constitute the working portion of flat panel sensor jointly like this, is equivalent to the working sensor part 120 of Fig. 1.Wherein metal shielding board 7 is fixed on the hand hole cover plate 2 through set bolt 6, links to each other with GIS housing hand hole 1, thereby has realized being connected with earthy, as the ground reference of whole sensor.
Dull and stereotyped VFTO survey sensor in the foregoing description, metal shielding board 7 are arranged in hand hole cover plate 2 interstitial holes, and be fixing with hand hole cover plate 2 with set bolt 6, and working sensor part metals paper tinsel 9 and insulation film 10 are built in the pipeline.This mounting means can be dismantled metal shielding board 7 at any time, and dismounting 7, two packing washer 5a of metal shielding board and 5b still can guarantee the impermeability of GIS.If dismantle or sensor installation, only need dismounting metal shielding board 7, just can realize that the scene of greatly facilitating is changed or overhauled sensor, guaranteed the long-term online detection operation of electrical network.
In the present embodiment derivation line of sensor 4 and build-out resistor 11 are placed in the interstitial hole insulation sleeve 12 of metal shielding board 7 in addition, extraneous like this electromagnetic interference (EMI) can be by shielding preferably, and the electromagnetic interference (EMI) that sensor receives is reduction greatly just.The effect of insulating sheath 12 is to prevent to derive line 4, build-out resistor 11 to contact with metal shielding board 7 and cause short circuit.
The big I of the low-voltage arm capacitor C 2 of this outer sensor is regulated through the area of change metal forming 9 and the thickness of insulation film 10 according to the needs of actual intrinsic standoff ratio, so just makes sensor more flexible in design.Metal forming 9 can the aluminium foil paper; Insulation film 10 can use teflon or polyester film, and the two all has higher dielectric strength, and the thickness of insulation film 10 can freely be selected as required.
Consider general GIS internal gas pressure generally about 0.4Mpa, in order to bear this pressure, the thickness of epoxy resin board 3 generally is not less than 25mm.Consider the requirement of sealing, connection hand blind patch 2 and epoxy resin 3, the set bolt 6 of connection epoxy resin board 3 and metal shielding board 7, its internal thread on hand hole cover plate 2 cannot be attacked hand hole cover plate 2.
It will be understood by those skilled in the art that on metal shielding board shield opening can be set, perhaps shield opening is arranged on other position, and measuring-signal is extracted through alternate manner.The composition of present embodiment has been described according to function in above-mentioned explanation prevailingly; Those skilled in the art can make each specific part of sensor and otherwise realize described function, but this realization should not thought and exceeds scope of the present invention.
To the above-mentioned explanation of the disclosed embodiments, make those skilled in the art can realize or use the present invention.Multiple modification to these embodiment will be conspicuous to one skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to embodiment illustrated herein, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (6)
1. flat-plate VFTO measuring sensor; It is characterized in that; Comprise: gas insulated transformer substation GIS housing hand hole, hand hole cover plate, sealing medium plate, first packing washer, second O-ring seal, metal shielding board, metal forming, insulation film, extension line and build-out resistor
Wherein said hand hole cover plate has middle perforate, covers on the said GIS housing hand hole, fixes with said GIS housing hand hole, is provided with first packing washer between the two;
Said sealing medium plate covers on the inboard aperture of said hand hole cover plate, and fixes with said hand hole cover plate, is provided with second packing washer between the two;
Said metal shielding board is arranged in the middle perforate of said hand hole cover plate, fixes with said hand hole cover plate;
Said metal forming is attached on the said insulation film, and said insulation film is attached on said metal shielding board and the said sealing medium plate opposed inside face;
Said build-out resistor one end is connected on the said metal forming through deriving line, and the other end is as deriving end.
2. sensor according to claim 1 is characterized in that, the fixed form of said hand hole cover plate and GIS housing hand hole, said hand hole cover plate and sealing medium plate, said hand hole cover plate and metal shielding board adopts bolt.
3. sensor according to claim 1 is characterized in that, further comprises shield opening, insulation sleeve and joint,
Wherein said shield opening is located at the center of shielded metal plate, and the inwall of said shield opening is provided with said insulation sleeve, and said joint is fixed on said shield opening outer openings place.
4. sensor according to claim 3 is characterized in that, said build-out resistor is arranged in the insulation sleeve in the said shield opening with the derivation line, and the derivation end of said build-out resistor is connected with said joint.
5. according to claim 1 or 3 described sensors, it is characterized in that said sealing medium plate is an epoxy resin board.
6. sensor according to claim 5 is characterized in that the thickness of said epoxy resin board is not less than 25mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010119127 CN101782603B (en) | 2010-03-08 | 2010-03-08 | Flat-plate VFTO measuring sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010119127 CN101782603B (en) | 2010-03-08 | 2010-03-08 | Flat-plate VFTO measuring sensor |
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| Publication Number | Publication Date |
|---|---|
| CN101782603A CN101782603A (en) | 2010-07-21 |
| CN101782603B true CN101782603B (en) | 2012-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010119127 Active CN101782603B (en) | 2010-03-08 | 2010-03-08 | Flat-plate VFTO measuring sensor |
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| CN (1) | CN101782603B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201765253U (en) * | 2010-08-23 | 2011-03-16 | 上海市电力公司超高压输变电公司 | Extra-high voltage cable fault point searching test signal input terminal of general type GIS (geographic information system) equipment |
| CN102323523B (en) * | 2011-06-02 | 2014-01-29 | 平高集团有限公司 | Built-in coupler for measuring local discharge of GIS (Gas Insulated switchgear) |
| CN102707131B (en) * | 2012-05-18 | 2014-07-09 | 华北电力大学 | Very fast transient overvoltage (VFTO) automatic measuring system for high-sensitivity medium window |
| CN103235166B (en) * | 2013-04-17 | 2015-08-05 | 清华大学 | Hand-hole type capacitive voltage divider |
| CN106405186B (en) * | 2015-07-31 | 2020-01-14 | 中国电力科学研究院 | Dual-purpose voltage divider based on standard capacitor |
| CN106443116B (en) * | 2015-08-07 | 2019-04-05 | 中国电力科学研究院 | A kind of low-voltage arm of impacting with high pressure capacitive divider |
| CN106645876A (en) * | 2016-12-29 | 2017-05-10 | 国家电网公司 | Measurement system and measurement method for high-frequency transit voltage in GIS |
| CN109406978B (en) * | 2018-12-21 | 2020-11-24 | 云南电网有限责任公司电力科学研究院 | Terminal matching resistor for GIS |
| CN112034236B (en) * | 2020-09-07 | 2021-08-03 | 华北电力大学 | Online monitoring device and method for transient voltage of cable elbow terminal |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2148390T3 (en) * | 1994-10-07 | 2000-10-16 | Phoenix Contact Gmbh & Co | PROTECTION ELEMENT AGAINST OVERVOLTAGE. |
| CN100565223C (en) * | 2008-03-05 | 2009-12-02 | 国网武汉高压研究院 | Flat-plate type broad frequency sensor for power transmission engineering |
| CN101458273B (en) * | 2008-12-26 | 2011-03-23 | 西北电网有限公司 | Sensor for measuring very fast transient overvoltage in GIS |
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| CN101782603A (en) | 2010-07-21 |
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