CN101738591B - On-site CVT integrated verification system - Google Patents

On-site CVT integrated verification system Download PDF

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Publication number
CN101738591B
CN101738591B CN200810197635XA CN200810197635A CN101738591B CN 101738591 B CN101738591 B CN 101738591B CN 200810197635X A CN200810197635X A CN 200810197635XA CN 200810197635 A CN200810197635 A CN 200810197635A CN 101738591 B CN101738591 B CN 101738591B
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China
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standard
cvt
capacitor
transformer
potential transformer
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CN200810197635XA
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Chinese (zh)
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CN101738591A (en
Inventor
章述汉
周峰
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国网电力科学研究院
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Publication of CN101738591A publication Critical patent/CN101738591A/en
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Abstract

The invention provides an on-site CVT integrated verification system, which comprises a test power supply, a standard appliance, a measuring apparatus and a vehicle-mounted test platform. The test power supply consists of a series reactor, an exciting transformer and a voltage regulator; the standard appliance comprises a high-tension bushing, a standard voltage transformer and a standard capacitor, wherein the high-tension bushing, the standard voltage transformer, the standard capacitor and the series reactor are designed into an integrated sulfur hexafluoride SF6 closed combined electrical apparatus (GIS); and the standard voltage transformer is designed into an SF6 gas insulated reclining posture type structure. The system of the invention can conveniently, accurately and reliably verify the ratio error of on-site 220Kv to 500 Kv CVT (capacitor voltage transformer), the capacitance of a capacitive divider, the medium loss, and the like without unloading from a vehicle. The additional error guided by the measuring system is relatively fixed and is easy to measure, wherein the variation thereof is less than or equal to 0.02 percent.

Description

On-site CVT integrated verification system
Technical field
The present invention relates to a kind of on-site CVT integrated verification system, belong to calibration, calibrating and detection field to power equipment.
Background technology
CVT (capacitance type potential transformer) is the important electrical in electrical network, mainly by capacitive divider and in pressure transformer form, capacitive divider is comprised of insulator and the some series capacitors that are mounted in it, middle pressure transformer is by the transformer be contained in leakproof fuel cell, compensation reactor and damping unit form, suppress resonance with damping unit, damping unit is comprised of resistance and reactor.In generating plant and transformer station, the CVT put into operation is carried out to reliability and safety testing is very necessary with minimizing accident occurrence probability.In recent years, along with power industry keeps reforming, generating separates operation with power transmission and distribution enterprise, and the effect of CVT in the metering of critical point highlights, its accuracy directly affects the trade settlement of electric energy, thus CVT especially critical point metering with the accuracy test of CVT, more and more come into one's own.In " GB1207-1997 voltage transformer (VT) " and " GB/T4703-2001 capacitance type potential transformer ", requirement is carried out verification to the proportional error of electric capacity, dielectric loss and the CVT of capacitive divider.At present, for the 220kV installed or put into operation~500kV CVT, be all the mode that adopts the formula field-checking of removing stage makeup and costume basically, pass through experiment power supply, standard instruments and surveying instrument are transported to scene, after then again unloading, assembling, carry out verification.But this mode is owing to will through unloading,---assembling a succession of loaded down with trivial details link of---verification---entrucking, both easily caused testing equipment to damage, huge manpower and materials have also been wasted simultaneously, and while carrying out Assembling at every turn, due to experiment power supply, relative position between standard instruments and surveying instrument all is not quite similar, increased the uncertainty of distribution parameter, thereby cause the additive error of being introduced by measuring system very to be fixed, sometimes badly influence measurement result and even have influence on the judgement to the test product performance.And, along with the CVT electric pressure is higher, the bodily form of testing equipment is larger, it is also increasing that this mode is split the restriction that represents a verifying work.
Summary of the invention
The objective of the invention is: the deficiency for the existing existence in transportation, measurements for the verification mode of on-site CVT being carried out to verification and check system is improved, a kind of on-site CVT integrated verification system is provided, can be in the situation that without unloading, on-the-spot 220kV~proportional error of 500kV CVT, the electric capacity of capacitive divider and dielectric loss etc. be carried out to convenience, accurate and reliable verification, the additive error of being introduced by measuring system is relatively fixing and be easy to measure its variable quantity≤0.02%.
Technical scheme of the present invention is: on-site CVT integrated verification system, it is characterized in that: comprise experiment power supply, standard instruments, surveying instrument and vehicular test platform, experiment power supply is by current-limiting reactor, exciting transformer and pressure regulator form, standard instruments comprises bushing, standard potential transformer and standard capacitor, surveying instrument comprises the high-voltage capacitance electric bridge, mutual-inductor tester and two Burden box, all devices except surveying instrument all is fixedly mounted on the vehicular test platform, and bushing, standard potential transformer, standard capacitor, current-limiting reactor, exciting transformer and pressure regulator are linked in sequence, it is measurement zone thereafter, surveying instrument is placed in measurement zone,
Bushing, standard potential transformer, standard capacitor and current-limiting reactor are designed to integrated sulfur hexafluoride SF 6Gas insulated metal enclosed swit chgear GIS, wherein standard potential transformer is designed to SF 6Gas-insulated reclining posture structure, current-limiting reactor is designed to SF 6Gas-insulated, inversion type cascaded structure, band is adjusted the sense tap, adopts switching over.
On-site CVT integrated verification system as above, it is characterized in that: high-pressure conductor is successively by the centre of bushing, standard potential transformer and standard capacitor, the upper and lower both sides of standard capacitor comprise the standard capacitance low-field electrode, the high-pressure conductor of standard potential transformer and current-limiting reactor connectivity part and standard capacitance low-field electrode form electric capacity, as standard capacitor.
On-site CVT integrated verification system as above is characterized in that: all specified transformation ratio that standard potential transformer comprises 220kV~500kV CVT.
On-site CVT integrated verification system as above is characterized in that: the vehicular test platform is the railway carriage casing.
The invention has the beneficial effects as follows: 1, standard potential transformer is designed to SF 6Gas-insulated reclining posture structure, provide convenience for vehicle-mounted transport when reducing vertical height; 2, bushing, standard potential transformer, standard capacitor and current-limiting reactor are designed to integrated GIS structure, greatly reduce manufacturing cost; 3, after adopting integrated design, without unloading, can carry out verifying work, improve work ratio; While 4, measuring, experiment power supply, standard instruments and the surveying instrument position on test platform is relatively fixing, has reduced the uncertainty of the additive error of being introduced by check system self in measurement.
The accompanying drawing explanation
Fig. 1, the device layout schematic diagram of the on-site CVT integrated verification system of the embodiment of the present invention.
Fig. 2, the measurement zone device layout schematic diagram in Fig. 1.
Fig. 3, the bushing in Fig. 1, standard potential transformer, standard capacitor and current-limiting reactor form integrated GIS inner structure schematic diagram.
Fig. 4 (a), the CVT proportional error measuring circuit figure of the embodiment of the present invention.
Fig. 4 (b), the electric capacity of capacitive divider and dielectric loss measurement wiring diagram in the CVT of the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, on-site CVT integrated verification system of the present invention is described further.
Mark in Fig. 1: 1-bushing, 2-standard potential transformer, 3-standard capacitor, 4-current-limiting reactor, 5-exciting transformer, 6-pressure regulator, 7-vehicular test platform.
Mark in Fig. 3: 8-high-pressure conductor, 9-earth potential guarded electrode, winding of 10-mutual inductor, 11-mutual inductor Secondary Winding, the 12-transformer iron core, 13-standard capacitance low-field electrode, 14-adjusts the sense change-over switch, the 15-core of reactor, 16-reactor inductance coil, 17-casing, the 18-hole that is located by connecting, r1-high-pressure conductor radius, the r2-inside radius.
The dividing potential drop electric capacity of mark in Fig. 4: C1, C2-tested CVT, the compensation reactor in Lk-CVT, Y1, Y2-Burden box, QS-high-voltage capacitance electric bridge, HE-mutual-inductor tester.
The device layout schematic diagram of the on-site CVT integrated verification system of the embodiment of the present invention as shown in Figure 1, on-site CVT integrated verification system, comprise experiment power supply, standard instruments, surveying instrument and vehicular test platform 7, experiment power supply is by current-limiting reactor 4, exciting transformer 5 and pressure regulator 6 form, standard instruments comprises bushing 1, reclining posture polytropic ratio standard potential transformer 2 and high voltage standard capacitor 3, all devices except surveying instrument all is fixedly mounted on vehicular test platform 7, and bushing 1, reclining posture polytropic ratio standard potential transformer 2, high voltage standard capacitor 3, current-limiting reactor 4, exciting transformer 5 and pressure regulator 6 are linked in sequence, it is measurement zone thereafter, surveying instrument is placed in measurement zone, vehicular test platform 7 is the railway carriage casing.
Visible in Fig. 2, the high-voltage capacitance electric bridge in surveying instrument, mutual-inductor tester and two Burden box sequentially are placed in measurement zone.
As shown in Figure 3, there is earth potential guarded electrode 9 bushing 1 inwall both sides, in standard potential transformer 2, outside mutual inductor Secondary Winding 11 and altogether, on transformer iron core 12, their centre positions in standard potential transformer 2, can traverse be reclining posture to winding 10 of mutual inductor; Standard capacitor comprises standard capacitance low-field electrode 13 in both sides Shang Xia 3, in the casing 17 of current-limiting reactor 4, adjust sense change-over switch 14, reactor inductance coil 16, core of reactor 15 and reactor inductance coil 16 orders to arrange, high-pressure conductor 8 is successively by behind the centre of bushing 1, standard potential transformer 2 and standard capacitor 3, with adjusting sense change-over switch 14, be connected, standard potential transformer 2 forms electric capacity with the high-pressure conductor 8 of current-limiting reactor 4 connectivity parts with standard capacitance low-field electrode 13, as standard capacitor 3 for system check.
As shown in Fig. 4 (b) in the electric capacity of capacitive divider and dielectric loss measurement test loop embodiment, the rated voltage of CVT U N = 500 / 3 kV , High pressure ground capacitance and tank capacitance sum are about 5000pF.Pressure regulator 6 is 380V/420V, 30kVA.Exciting transformer 5 capacity are 25kVA, output voltage 0~20kV, output rated current 1.25A.Current-limiting reactor 4 is designed to four series connection, single-unit capacity 100kV/1A, and wherein a joint is with 4 to divide equally tap a, b, c, d, feel change-over switch 14 switchings by tune.During standard capacitor 3 design, the long L of note standard capacitance low-field electrode, inside radius r2, high-pressure conductor radius r 1, get L=0.327m, r1=0.03m, r2=0.09m, Cs = 2 π ϵ 0 L / ln ( r 2 r 1 ) = 20 pF , Wherein, ε 0=8.854 * 10 -12F/m.Regulate pressure regulator 6 voltages, series resonant equipment (adjusting sense change-over switch 14, core of reactor 15, reactor inductance coil 16) output voltage is risen to 0.9~1.1U N, available high-voltage capacitance electric bridge QS measures the electric capacity C1 of capacitive divider in CVT, C2 and dielectric loss tg δ.
As shown in Fig. 4 (a), standard capacitor 3 low pressure end ground connection, " the relative method circuit of Application standard voltage transformer (VT) 2 " in use " electric power mutual-inductor rules " measured the proportional error of CVT by mutual-inductor tester HE.

Claims (4)

1. on-site CVT integrated verification system, it is characterized in that: comprise experiment power supply, standard instruments, surveying instrument and vehicular test platform, experiment power supply is by current-limiting reactor, exciting transformer and pressure regulator form, standard instruments comprises bushing, standard potential transformer and standard capacitor, surveying instrument comprises the high-voltage capacitance electric bridge, mutual-inductor tester and two Burden box, all devices except surveying instrument all is fixedly mounted on the vehicular test platform, and bushing, standard potential transformer, standard capacitor, current-limiting reactor, exciting transformer and pressure regulator are linked in sequence, it is measurement zone thereafter, surveying instrument is placed in measurement zone,
Bushing, standard potential transformer, standard capacitor and current-limiting reactor are designed to integrated sulfur hexafluoride SF 6Gas insulated metal enclosed swit chgear GIS, wherein standard potential transformer is designed to SF 6Gas-insulated reclining posture structure, current-limiting reactor is designed to SF 6Gas-insulated, inversion type cascaded structure, band is adjusted the sense tap, adopts switching over.
2. on-site CVT integrated verification system according to claim 1, it is characterized in that: high-pressure conductor is successively by the centre of bushing, standard potential transformer and standard capacitor, the upper and lower both sides of standard capacitor comprise the standard capacitance low-field electrode, the high-pressure conductor of standard potential transformer and current-limiting reactor connectivity part and standard capacitance low-field electrode form electric capacity, as standard capacitor.
3. on-site CVT integrated verification system according to claim 1, is characterized in that: all specified transformation ratio that standard potential transformer comprises 220kV~500kV CVT.
4. on-site CVT integrated verification system according to claim 1, it is characterized in that: the vehicular test platform is the railway carriage casing.
CN200810197635XA 2008-11-13 2008-11-13 On-site CVT integrated verification system CN101738591B (en)

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CN101738591B true CN101738591B (en) 2013-12-04

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CN102043099A (en) * 2010-10-28 2011-05-04 河南省电力公司平顶山供电公司 Device for testing dielectric loss at high voltage
CN102901866A (en) * 2011-07-27 2013-01-30 苏州华电电气股份有限公司 Vehicular automatic capacitance and inductance tester
CN102323562A (en) * 2011-08-12 2012-01-18 山东泰开互感器有限公司 Complete set of error checking device for ultrahigh/extra-high voltage capacitor voltage transformer
CN102608432A (en) * 2012-03-16 2012-07-25 辽宁省电力有限公司沈阳供电公司 Field high-voltage dielectric loss measurement device
CN102854486B (en) * 2012-09-26 2014-12-03 湖北省电力公司电力科学研究院 On-site initiative error-verification system for voltage transformer and method thereof
CN103605040A (en) * 2013-11-04 2014-02-26 国家电网公司 GIS-equipment built-in lightning-arrester alternating current leakage current test method
CN103640514A (en) * 2013-11-15 2014-03-19 益和电气集团股份有限公司 GIS equipment transport fixing block
CN103552495B (en) * 2013-11-21 2016-03-16 国家电网公司 Automatic unfolding high-voltage mutual inductor on-site proving car
CN104375112B (en) * 2014-11-07 2017-09-26 三峡大学 One kind is based on SF6The voltage transformer on-line testing system of parallel plate capacitor
CN106157789A (en) * 2015-04-17 2016-11-23 国网技术学院 Relative dielectric loss and capacitance detection tutoring system
CN105372615B (en) * 2015-12-08 2018-04-03 武汉磐电科技股份有限公司 A kind of anti-interference 1000kV extra-high voltage transformers are vehicle-mounted to verify platform and its method of calibration
CN105372617A (en) * 2015-12-11 2016-03-02 国网四川省电力公司电力科学研究院 Three-phase capacitor type voltage transformer error integral verification method
CN105467350B (en) * 2015-12-28 2018-09-07 国网山东省电力公司电力科学研究院 A kind of vehicle-mounted extra-high voltage CVT verifications Z-type lifting gear and method
CN105425189B (en) * 2016-01-15 2018-06-22 武汉磐电科技股份有限公司 Extra-high voltage transformer separate type verifies platform and its installation and checking method
CN105609277B (en) * 2016-02-18 2017-07-18 武汉磐电科技有限公司 1000kV extra-high voltages CVT the verification fixed REgulatable reactor of multi-tap and implementation method
CN107422291A (en) * 2017-09-14 2017-12-01 中国电力科学研究院 A kind of AC extra high voltage voltage transformer error check system and method

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CN201285439Y (en) * 2008-11-13 2009-08-05 国网武汉高压研究院 Integrated verification equipment for field CVT

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