CN201226010Y - Flat-plate type rapid steep-wave VFTO sensor - Google Patents
Flat-plate type rapid steep-wave VFTO sensor Download PDFInfo
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- CN201226010Y CN201226010Y CNU2008200658088U CN200820065808U CN201226010Y CN 201226010 Y CN201226010 Y CN 201226010Y CN U2008200658088 U CNU2008200658088 U CN U2008200658088U CN 200820065808 U CN200820065808 U CN 200820065808U CN 201226010 Y CN201226010 Y CN 201226010Y
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Abstract
The utility model discloses a flat type fast steep wave VFTO sensor which includes a GIS shell 1, a cavity shield 24, an electrode plate 3, an insolating film 2, a connectior 5, a plug 11, a salver 15 and a plurality of matching resistances 14; the cavity shield 24 is arranged on the opening location of the GIS shell 1; the electrode plate 3 is spaced by the isolating film 2 and is closed on the cavity shield 24; the electrode plate 3 is electrically connected with the shield type plug 11 by the insolated connector 5; the plug 11 is fixed on the cavity shield 24; the slaver 15 fixed on the inner cavity of the cavity shield 24 is arranged between the connection 5 and the plug 11; the shaft center of the plug 11 is arranged in the circular center of the slaver 15; a plurality of matching resistances 14 connected in parallel are uniformly arranged along the circumference of the salver 15. The flat type fast steep wave VFTO sensor is a practical fast steep wave sensor, which connects and integrates a capacity transducer, the matching resistances of a measuring system and a signal shield protection function and the connector for connecting a measuring cable into a whole body; moreover, a plurality of matching resistances connected in parallel are uniformly arranged inside the sensor; the measuring system has the advantages of small spurious inductance, small waveform distortion factor and broad measuring frequency domain; the flat type fast steep wave VFTO sensor can be used for the VFTO measuring in GIS or H-GIS.
Description
Technical field
The utility model belongs to the quick steep wave sensor of power transmission engineering, and the online quick steep wave (VFTO) that is specially adapted to VFTO among extra-high voltage engineering equipment GIS, the H-GIS is measured, and also can be used for measurement of partial discharge and duplex frequency voltage measuring.
Background technology
(H-GIS) middle isolator operation very easily produces voltage magnitude height, steep quick steep wave superpotential (VFTO) of rise time for gas insulated transformer substation (GIS), half gas insulated transformer substation.Electric pressure is high more, and VFTO is big more to the harm of GIS, H-GIS, particularly the extra-high voltage engineering.
When electric pressure is low (as 220kV, 500kV), all adopt the spherical capacitance probe that is encapsulated in the insulator as sensor in the actual engineering, supporting low-voltage arm capacitor is external, external low-voltage arm capacitor and attached lead-in wire cause the measuring system stray inductance bigger, the measuring-signal distortion that obtains is serious, and sensitivity is low.Cause another key factor of measuring-signal distortion to be, also exist a bit of drawing to connect lead (wave impedance reaches 200 Ω) between sensor and the measurement cable, this section is drawn and is connected lead and measure that impedance does not match between the cable (wave impedance is generally 50 Ω and 75 Ω), capable turning back of ripple can be taken place penetrate.The frequency domain scope of VFTO can reach 2MHz～40MHz, local catadioptric must take place in the capable ripple of this frequency domain under the unmatched situation of impedance, the waveform of measuring and the transient state different wave shape of Computer Simulation are very big, and many physical phenomenons can't obtain proper explanations.
The follow-up scholar of VFTO Research on measuring technique has proposed plate electrode structure sensor, distributed capacitance between plate electrode and the pipeline bus forms the high-voltage arm electric capacity of capacitive divider, the dull and stereotyped low-voltage arm capacity plate antenna that forms of plate electrode and earthing pole, and the method that is connected with the measurement cable with taper signal extension line of the signal that proposes to respond on the pole plate.The low-voltage arm plate electrode electric capacity stray inductance of this structure sensor is little, and the measuring system good frequency response is highly sensitive.But, plate electrode structure sensor is among the laboratory model research always, do not consider that the built-in installation of sealing, matched impedance, signal in the practical application transmit a series of concrete job applications problems such as shielding protection, more do not consider the calibration of measuring system.
The extra-high voltage engineering is about to enter the Large scale construction stage, the online detection of VFTO among GIS, the H-GIS is not only very necessary but also very urgent, need at first solve the practicability problem of plate electrode structure sensor, for the development of the collimation technique of VFTO measuring system lays the foundation.
Summary of the invention
The purpose of this utility model be for solve existing VFTO measure the stray inductance that exists with plate sensor big, exist the transition lead-in wire to cause the row setback to be returned to penetrate and waveform distortion takes place, do not consider sealing reliability that engineering inserts sensor and long-time stability, sensor installation, matched impedance are built-in, coaxial signal transmits the integrated engineering problem such as be connected of shielding line, provide a kind of plate quick steep wave VFTO sensor of practicability, for the extra-high voltage engineering lays the foundation with the VFTO on-line measurement among GIS, the H-GIS; The utility model also can be used UHV (ultra-high voltage) engineering VFTO and measure and use sensor, can be applicable among GIS and the H-GIS measurement of partial discharge and uses sensor with the location, also can be applicable to steady state voltage among GIS and the H-GIS (power-frequency voltage) measurement sensor.
The technical solution of the utility model is: a kind of plate quick steep wave VFTO sensor is characterized in that: it comprises GIS housing 1, cavity shielding 24, battery lead plate 3, dielectric film 2, connector 5, plug 11, pallet 15, build-out resistor 14;
Aforesaid plate quick steep wave VFTO sensor is characterized in that: be uniformly distributed with 4～8 build-out resistors 14 on the pallet 15 along the circumference.
Aforesaid plate quick steep wave VFTO sensor is characterized in that: cavity shielding 24 has one group to be used to observe being connected and the viewport of operation of connector 5 and plug 11, and viewport hides with shading ring 9 and screw 10.
The beneficial effects of the utility model:
1, combines together being used for capacitive transducer, measuring system build-out resistor, the signal shielding safeguard function of GIS or H-GIS VFTO measurement in the prior art and connecting the plug connector connection of measuring cable, cancelled the lead-in wire connection between sensor and the measurement cable.
2, build-out resistor 14 is installed in cavity and shields 24 inboards, not disturbed by the external electromagnetic signal, and build-out resistor is that a plurality of resistance annular evenly distributes, and has reduced build-out resistor and has inserted the stray inductance of introducing, and has improved the sensor Hz-KHz.
3, the insulation thickness between battery lead plate size, battery lead plate and cavity shielding can be adjusted easily, to change the intrinsic standoff ratio of measuring system.
4, cavity shielding 24 has viewport, is used to observe the attended operation between connector 5 and the plug 11, covers viewport with shading ring 10 then, plays the shielding protection effect, makes measuring-signal not invaded and harassed by the external electromagnetic ripple.
5, sensor of the present utility model promptly can be used for the VFTO measurement among GIS, the H-GIS, also can be used for the measurement of partial discharge among GIS, the H-GIS, also can be used for the duplex frequency voltage measuring among GIS, the H-GIS.
Description of drawings
Fig. 1, the utility model example structure figure;
Fig. 2 is A among Fig. 1-A place cut-open view;
Fig. 3 is B among Fig. 1-B place cut-open view.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
The explanation of mark among Fig. 1-3: 1-GIS housing, 2-dielectric film, 3-battery lead plate, 4-dormant bolt, 5-connector, 6-O-ring seal, 7-nut, 8-packing ring, 9-shading ring, 10-screw, 11-plug, 12-capping, 13-snap head bolt, 14-build-out resistor, 15-pallet, 16-insulation sleeve, 17-insulation sleeve, 18-O-ring seal, 19-bolt, 20-nut, 21-plain washer, 22-spring washer, 23-snap head bolt, the shielding of 24-cavity, 25-connecting line.
Fig. 1 is the structural drawing of the utility model embodiment.Characteristics of the present utility model are to utilize the capacitive divider that is made of capacitance type sensor to make build-out resistor, the signal shielding safeguard function of traditional sensor, measuring system and is connected the plug connector connection of measuring cable to combine together.
Stray capacitance between battery lead plate 3 and GIS or H-GIS median generatrix constitutes the high-voltage arm capacitor C of capacitive divider
1, form the low-voltage arm capacitor C between battery lead plate 3 and the cavity shielding 24
2, cavity shielding 24 is connected with earth potential with GIS or H-GIS housing 1.The low-voltage arm capacitor C
2Major insulation be dielectric film 2; The thickness of polyester insulated film 2 can be 0.05mm～0.06mm, according to the requirement of measuring system intrinsic standoff ratio, adjusts the low-voltage arm capacitor C by changing polyester insulated film 2 thickness that use
2Electric capacity, simultaneously the thickness of mylar material will have enough dielectric strengths, the low-voltage arm capacitor C
2Voltage breakdown must not be lower than the twice of induced voltage on the battery lead plate 3.
Battery lead plate 3 is connected with connector 5 usefulness dormant bolts 4, and the measuring-signal of induction is drawn through connector 5 on the battery lead plate 3, is connected with shielded plug 11 with connecting line 25, and shielded plug 11 inserts the transient state record with external plug connector and cable again.
The effect of earthing pole and signal wire shielding is being born in cavity shielding 24 simultaneously; O-ring seal 6, packing ring 18 play sealing function; Insulation sleeve 16,17 is used for the insulation between battery lead plate 3, connector 5 and the cavity shielding 24; Be welded with one group of (6) build-out resistor 14 between copper metal tray 15 and the connector 5,6 build-out resistors 14 are electrically connected with cavity shielding 24 and connector 5, with snap head bolt 23 copper metal tray 15 is fixed on cavity and shields 24 inboards, as the support of build-out resistor 14 be electrically connected, snap head bolt 23 is used for fixing the position of pallet 15 with pallet 15.
Nut 7 and packing ring 8 are used for being connected of connector 5 and cavity shielding 24, and screw thread on the connector 5 and nut 7 are complementary, be used to be fastenedly connected 5 and cavity shielding 24 between sealing load;
Securing member (bolt 19, nut 20, plain washer 21 and spring washer 22) is used for the cavity shielding 24 of sensor body and fixedlying connected of GIS housing 1; Capping 12 is used to install and fix the plug 11 of stube cable, and snap head bolt 13 is used for being connected and fixed between capping 12 and the cavity shielding 24.
Near the stray electrical capacity between sensor electrical pole plate 3 and the GIS housing 1 and the diameter of GIS housing 1, bus diameter and the battery lead plate 3 GIS housing 1 structure (whether bus length has the turning) is relevant, and electric capacity is in the pF level; According to measurand (measuring VFTO, shelf depreciation or power-frequency voltage) difference, the diameter of sensor electrical pole plate 3 is at 50～120mm.Battery lead plate diameter selectable range was generally 80～120mm when VFTO measured, and battery lead plate diameter selectable range is generally 50～100mm during measurement of partial discharge, and battery lead plate diameter selectable range even can be greater than 120mm greater than 100mm during duplex frequency voltage measuring; Change the diameter of battery lead plate 3 and the thickness of dielectric film 2, can change the capacitance partial pressure ratio.
The quantity of build-out resistor 14 can be 4～8, evenly distributes to reduce stray inductance, and the multiparasitization inductance is more little more for quantity; Cavity shielding 24 is in identical current potential with GIS housing 1, and reserving certain coaxial distance between the two is the installation of cavity shielding for convenience 24, and the insulating space between battery lead plate 3 edges and the GIS housing 1; Cavity shielding 24 can be adopted alloy aluminum (as the anti-aluminium of embroidering) material, the corrosion that prevents to get rusty and cause; Battery lead plate 3, connector 5 and dormant bolt 4, pallet 15 adopt copper material, and zinc-plated processing, make signal transduction pathway have good conduction; Plug 11 is the protected type plug connector, is supporting plug connector with being used to measure the plug that cable is connected; Insulation sleeve 16 and 17 adopts polytetrafluoroethylmaterial material, has the good insulation performance characteristic; The seal groove size of O-ring seal 6 and 18 correspondences and technological requirement require design according to GIS air insulating device Seal Design and select.
Claims (3)
1, a kind of plate quick steep wave VFTO sensor is characterized in that: it comprises GIS housing (1), cavity shielding (24), battery lead plate (3), dielectric film (2), connector (5), plug (11), pallet (15) and build-out resistor (14);
Cavity shielding (24) is contained in the tapping of GIS housing (1), battery lead plate (3) abuts in the cavity shielding (24) across dielectric film (2), battery lead plate (3) is electrically connected with protected type plug (11) by the web member (5) of insulation, plug (11) is fixed in the cavity shielding (24), a pallet (15) that is fixed on cavity shielding (24) inner chamber is housed between web member (5) and the plug (11), the axle center of plug (11) is positioned at the center of circle of pallet (15), is uniformly distributed with the build-out resistor (14) of a plurality of parallel connections on the pallet (15) along the circumference.
2, plate quick steep wave VFTO sensor as claimed in claim 1 is characterized in that: be uniformly distributed with 4～8 build-out resistors (14) on the pallet (15) along the circumference.
3, as claim 1 or described plate quick steep wave VFTO sensor, it is characterized in that: cavity shielding (24) has one group to be used to observe being connected and the viewport of operation of connector (5) and plug (11), and viewport is with shading ring (9) and screw (10) covering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200658088U CN201226010Y (en) | 2008-03-05 | 2008-03-05 | Flat-plate type rapid steep-wave VFTO sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200658088U CN201226010Y (en) | 2008-03-05 | 2008-03-05 | Flat-plate type rapid steep-wave VFTO sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201226010Y true CN201226010Y (en) | 2009-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200658088U Expired - Lifetime CN201226010Y (en) | 2008-03-05 | 2008-03-05 | Flat-plate type rapid steep-wave VFTO sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865987A (en) * | 2010-06-17 | 2010-10-20 | 西安交通大学 | Capacitance sensor calibration system for measuring very fast transient overvoltage (VFTO) |
| CN109324216A (en) * | 2018-11-13 | 2019-02-12 | 中国电力科学研究院有限公司 | Low-voltage arm and transient voltage measuring device |
| CN111426922A (en) * | 2020-04-29 | 2020-07-17 | 云南电网有限责任公司电力科学研究院 | GI L discharge fault positioning system and method based on steep slope |
-
2008
- 2008-03-05 CN CNU2008200658088U patent/CN201226010Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865987A (en) * | 2010-06-17 | 2010-10-20 | 西安交通大学 | Capacitance sensor calibration system for measuring very fast transient overvoltage (VFTO) |
| CN101865987B (en) * | 2010-06-17 | 2013-01-02 | 西安交通大学 | Capacitance sensor calibration system for measuring very fast transient overvoltage (VFTO) |
| CN109324216A (en) * | 2018-11-13 | 2019-02-12 | 中国电力科学研究院有限公司 | Low-voltage arm and transient voltage measuring device |
| CN111426922A (en) * | 2020-04-29 | 2020-07-17 | 云南电网有限责任公司电力科学研究院 | GI L discharge fault positioning system and method based on steep slope |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE NETWORK ELECTRIC POWER RESEARCH INSTITUTE Free format text: FORMER OWNER: WUHAN HIGH VOLTAGE RESEARCH INSTITUTE OF STATE GRID Effective date: 20090904 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090904 Address after: Nanjing City, Jiangsu Province, Nan Shui Road No. 8, zip code: 210003 Co-patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Patentee after: Power Science Research Institute of national network Address before: Hubei province Wuhan city Hongshan District Luoyu road 143, zip code: 430074 Patentee before: Guowang Wuhan High Voltage Inst |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160629 Address after: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Address before: Nanjing City, Jiangsu Province, 210003 South Shui Road No. 8 Patentee before: State Grid Electric Power Research Insititute Patentee before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090422 |