CN100565223C - Flat-plate type broad frequency sensor for power transmission engineering - Google Patents
Flat-plate type broad frequency sensor for power transmission engineering Download PDFInfo
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- CN100565223C CN100565223C CNB2008100469926A CN200810046992A CN100565223C CN 100565223 C CN100565223 C CN 100565223C CN B2008100469926 A CNB2008100469926 A CN B2008100469926A CN 200810046992 A CN200810046992 A CN 200810046992A CN 100565223 C CN100565223 C CN 100565223C
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Abstract
A kind of flat-plate type broad frequency sensor for power transmission engineering, 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; 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, be equipped with one between web member 5 and the plug 11 and be fixed on the pallet 15 that cavity shields 24 inner chambers, 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.The present invention is the quick steep wave sensor of a kind of practicability, the plug connector connection that it measures cable with capacitive transducer, measuring system build-out resistor, signal shielding safeguard function and connection combines together, and the build-out resistor of a plurality of parallel connections is evenly distributed on sensor internal, the stray inductance of measuring system is little, waveform distortion is little, the measurement frequency domain is wide, and the VFTO that promptly can be used among GIS or the H-GIS measures.
Description
Technical field
The invention belongs to the quick steep wave sensor of power transmission engineering, 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
Isolator operation very easily produces voltage magnitude height, steep quick steep wave superpotential (VFTO) of rise time in gas insulated transformer substation (GIS), half gas insulated transformer substation (H-GIS).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 objective of the invention is 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 flat-plate type broad frequency sensor for power transmission engineering of practicability, for the extra-high voltage engineering lays the foundation with the VFTO on-line measurement among GIS, the H-GIS; The present invention also can use 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.
Technical scheme of the present invention is: a kind of flat-plate type broad frequency sensor for power transmission engineering 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 and insulation sleeve 16,17;
Aforesaid flat-plate type broad frequency sensor for power transmission engineering is characterized in that: be uniformly distributed with 4～8 build-out resistors 14 on the pallet 15 along the circumference.
Aforesaid flat-plate type broad frequency sensor for power transmission engineering 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.
Beneficial effect of the present invention:
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 invention 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, embodiment of the invention structural drawing;
Fig. 2 is an A-A place cut-open view among Fig. 1;
Fig. 3 is a B-B place cut-open view among Fig. 1.
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing.
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 embodiment of the invention.Characteristics of the present invention 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 the 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.
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.
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 flat-plate type broad frequency sensor for power transmission engineering 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) and insulation sleeve (16,17);
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), be uniformly distributed with the build-out resistor (14) of a plurality of parallel connections on the pallet (15) along the circumference, in battery lead plate (3), there is insulation sleeve (16 between connector (5) and the cavity shielding (24), 17).
2, flat-plate type broad frequency sensor for power transmission engineering 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 flat-plate type broad frequency sensor for power transmission engineering, 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 |
|---|---|---|---|
| CNB2008100469926A CN100565223C (en) | 2008-03-05 | 2008-03-05 | Flat-plate type broad frequency sensor for power transmission engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100469926A CN100565223C (en) | 2008-03-05 | 2008-03-05 | Flat-plate type broad frequency sensor for power transmission engineering |
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| Publication Number | Publication Date |
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| CN101236217A CN101236217A (en) | 2008-08-06 |
| CN100565223C true CN100565223C (en) | 2009-12-02 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782603B (en) * | 2010-03-08 | 2012-06-13 | 华北电力大学 | Flat-plate VFTO measuring sensor |
| CN101788603B (en) * | 2010-03-08 | 2013-04-17 | 华北电力大学 | VFTO measuring system |
| CN102590718B (en) * | 2012-02-22 | 2014-05-14 | 华北电力大学 | System for GIS (Global Information System) partial discharge measurement and VFTO (Very Fast Transient Overvoltage) measurement |
| CN102662097B (en) * | 2012-06-01 | 2014-03-19 | 中国电力科学研究院 | Broadband online measurement sensor for DC extra-high voltage corona current |
| CN103529278B (en) * | 2013-10-24 | 2016-07-20 | 河南平芝高压开关有限公司 | A kind of charged display safety embedded type sensor of GIS |
| 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 |
| 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 |
| CN109946573B (en) * | 2019-03-08 | 2021-10-22 | 国网山东省电力公司日照供电公司 | Local discharge direction finding method and system based on clustering and wireless sensor array |
| CN111049085B (en) * | 2019-12-20 | 2021-05-25 | 平高集团有限公司 | Integrated VFTO measuring bus and bus barrel thereof |
| CN111830315A (en) * | 2020-07-22 | 2020-10-27 | 云南电网有限责任公司电力科学研究院 | Non-contact transient overvoltage sensor with compact voltage division structure |
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