CN101074972B - Capacitance mask resistance sensor - Google Patents
Capacitance mask resistance sensor Download PDFInfo
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- CN101074972B CN101074972B CN200610080722A CN200610080722A CN101074972B CN 101074972 B CN101074972 B CN 101074972B CN 200610080722 A CN200610080722 A CN 200610080722A CN 200610080722 A CN200610080722 A CN 200610080722A CN 101074972 B CN101074972 B CN 101074972B
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Abstract
A resistance transducer of capacity-shielding type is prepared as parallel-connecting and jacketing capacity-shielding layer at external of high voltage resistance column on resistance transducer, forming said capacity-shielding layer by fixing a numbers of cylindrical media-along being superposed to each other and being isolated to each other in insulation media along axial direction from top to bottom for shielding off interference current caused by stray capacitance between high voltage conductor and high voltage resistance column so as to raise accuracy of voltage measurement.
Description
Technical field
Belong to the High-Voltage Electrical Appliances field,, gather high voltage signal and be converted to low-voltage signal, be used for the relay protection of high-tension measurement and electric system as the voltage sensor of photoelectric voltage mutual inductor.
Background technology
The voltage transformer (VT) of prior art has following several: the electromagnetic transformer of (1) paper oil insulation; (2) fill the electromagnetic potential transformer of SF6 gas; (3) casting insulated electromagnetic potential transformer; (4) capacitance type potential transformer of paper oil insulation; (5) electronic type voltage transformer.
(1) and (4) kind belongs to electromagnetic potential transformer and the capacitance type potential transformer that utilizes oilpaper to make main insulating material, (2) kind is to utilize SF6 to make the electromagnetic potential transformer of main insulating material, they all exist seepage, contaminated environment to some extent, maintenance workload is big, accident rate is higher, and problems such as volume is big, Heavy Weight.
(3) plants the electromagnetic potential transformer of poured with epoxy resin insulation, owing to many reasons such as material, structure and technologies, except electric pressure is low, also exists problems such as partial discharge quantity and dielectric loss factor are bigger.
(1), (2) and (3) kind belongs to electromagnetic potential transformer, all there is following problem in all electromagnetic potential transformers: 1. every mutual inductor all needs to dispose according to customer requirements the Secondary Winding of a plurality of difference in functionalitys, in order to prevent that core sataration from causing distorted signals, capacity unshakable in one's determination need be done greatlyyer, therefore, volume is big, Heavy Weight; 2. the magnetizing inductance of electromagnetic potential transformer and line capacitance parameter matching are improper is easy to cause ferroresonance, thus the harm security of system.
Recently, external 500kV photo-electric mutual inductor has entered China, and has dropped into operation of power networks.Domestic some company has also developed electronic type voltage transformer and has dropped into trial run.Because the photo-electric electric mutual inductor converts the electrical signal to light signal and utilizes Optical Fiber Transmission to instrument or protective relaying device; have light, rapid reaction signal, anti-tampering, many advantages such as cost is low; be the developing direction of high voltage potential transformer, have extraordinary prospect.
The voltage sensor of electronic type voltage transformer generally has two kinds of resistance-type or capacitance-voltage-distributing types, the high-voltage capacitance of capacitive divided voltage sensor need can bear high-tension, a plurality of capacity cell connection in series-parallel with certain electric capacity are formed its insulation system and technology more complicated.The resistance sensor of measuring voltage generally has two kinds of schemes, a kind of scheme is that the high-tension resistive with high value is connected with the low resistance with low resistance, between low resistance and ground, extract voltage signal, with the ratio sign high voltage numerical value of voltage signal times with high-tension resistive and low resistance.Another kind of scheme is to indicate high-tension numerical value with the resistance that the current value that high-tension resistive is flow through in measurement multiply by high-tension resistive.In order to solve the heating problem of resistance, no matter which kind of scheme all can be selected bigger resistance value usually, and the electric current that flows through high-tension resistive is controlled between 0.5～1mA.Under this parameter, high-pressure conductor, nearby device and grounding apparatus and the earth cause interference current can influence the uncertainty of resistance sensor to the stray capacitance of high-tension resistive, thereby make the accuracy of voltage measurement be difficult to reach requirement.
Summary of the invention
Purpose of the present invention is intended to overcome the deficiency of prior art, a kind of capacitance mask resistance sensor is provided, be at high-tension resistive post loong shunt suit one electric capacity screen layer with general resistance sensor difference, can mask because the interference current that the stray capacitance between high pressure or ground and the resistance post causes, guarantee the uncertainty of electric resistance sensor, thereby guaranteed the accuracy of voltage measurement.
Capacitance mask resistance sensor of the present invention, comprise the high-tension resistive post 1 of contacting and forming by web member 6 by several resistive elements 3 in the middle of placing, low resistance 2, grading shield 7, base frame 8, silicon rubber full skirt 11, measuring lead wire 10, measurement terminal 12, by several mutually nestable that isolate mutually again and high-tension resistive post 1 concentrically ringed tubular metal screen or semiconduction screen 4, be fixed on successively from top to bottom vertically and form cylindric electric capacity screen layer 5 in the insulating medium, be sleeved on the outside of high-tension resistive post 1, grading shield 7 is fixed on the top of electric capacity screen layer 5 and is electrically connected with uppermost tubular metal screen or semiconduction screen 4, base frame 8 is fixed on the bottom of electric capacity screen layer 5 and is electrically connected with nethermost tubular metal screen or semiconduction screen 4, the other end of the high-tension resistive post 1 that is electrically connected with grading shield 7 links to each other with the upper end of low resistance 2, and interface passes through measuring lead wire 10 thus, be electrically connected with the measurement terminal 12 on base frame 8 panels, the lower end of low resistance 2 is electrically connected with base frame 8, and be electrically connected with ground terminal 14 on base frame 8 panels, silicon rubber full skirt 11 closely is fixed on the outside surface of electric capacity screen layer 5, filling insulating medium 9 between high-tension resistive post 1 and the electric capacity screen layer 5.
Described a kind of capacitance mask resistance sensor by several and high-tension resistive post 1 concentrically ringed tubular metal screen or semiconduction screen 4, twines with the fibre compact of resin pickup vertically successively, constitutes rigid cylinder shape electric capacity screen layer 5.
Described a kind of capacitance mask resistance sensor, its filling insulating medium 9 between high-tension resistive post 1 and electric capacity screen layer 5 is insulating mediums of gas, liquid or solid.
Another kind of capacitance mask resistance sensor of the present invention, comprise the high-tension resistive post 1 of contacting and forming by web member 6 by several resistive elements 3 in the middle of placing, insulated leg 13, grading shield 7, base frame 8, silicon rubber full skirt 11, measuring lead wire 10, measurement terminal 12, by several mutually nestable that isolate mutually again and high-tension resistive post 1 concentrically ringed tubular metal screen or semiconduction screen 4, be fixed on successively from top to bottom vertically and form cylindric electric capacity screen layer 5 in the insulating medium, be sleeved on the outside of high-tension resistive post 1, grading shield 7 is fixed on the top of electric capacity screen layer 5 and is electrically connected with uppermost tubular metal screen or semiconduction screen 4, base frame 8 is fixed on the bottom of electric capacity screen layer 5 and is electrically connected with nethermost tubular metal screen or semiconduction screen 4, the lower end of the high-tension resistive post 1 that is electrically connected with grading shield 7 is insulated bearing 13 and is mechanically anchored on the base frame 4, and be electrically connected with measurement terminal 12 on base frame 8 panels by measuring lead wire 10, ground terminal 14 on base frame 8 panels firmly is connected on the base frame 8, silicon rubber full skirt 11 closely is fixed on the outside surface of electric capacity screen layer 5, filling insulating medium 9 between high-tension resistive post 1 and the electric capacity screen layer 5.
Compared with the prior art, the present invention has the following advantages:
1, have or not oil, no porcelain, no gas, fire prevention, explosion-proof, anti-pollution flashover, maintenance workload is little, the safe reliability advantages of higher;
2, with capacitive divider realize electronic type voltage transformer relatively as voltage sensor, the capacitance mask resistance sensor component size is little, in light weight, cost is low.
3, compare with general resistance sensor; capacitance mask resistance sensor can mask spuious capacitance current; limited the interference of high-voltage electric field to resitstance voltage divider; improve the accuracy of electric resistance sensor greatly, thereby guaranteed the reliability of the accuracy and the protective relaying device action of voltage measurement.
4, capacitance mask resistance sensor is to be in series by resistance; can as electromagnetic transformer, not cause measuring error because of core sataration; therefore; no matter be that big electric current or little electric current can both reflect like clockwork; no matter be to drive instrument or drive protective relaying device only to use a string resistance to get final product, needn't as electromagnetic transformer, use a plurality of Secondary Winding.
5, use the capacitance mask resistance sensor measuring voltage can overcome the shortcoming that electromagnetic potential transformer causes the electric system ferro-resonance over-voltage, also can overcome the ferroresonance of capacitance type potential transformer low tension loop;
Description of drawings
Fig. 1 is the capacitance mask resistance sensor synoptic diagram, is to utilize high-tension resistive and low resistance polyphone dividing potential drop, gathers low resistance voltage signal over the ground;
Fig. 2 is the synoptic diagram of another kind of capacitance mask resistance sensor, is the current signal that acquisition stream is crossed high-tension resistive.
Embodiment
Referring to Fig. 1, first kind of embodiment of capacitance mask resistance sensor of the present invention shown in it, (for example, 110kV capacitance mask resistance sensor).Comprise in the middle of placing by several resistive elements 3 (for example, 20 metalfilmresistors) (for example by web member 6, being fixed on the helicitic texture spare on the resistive element) the high-tension resistive post 1 formed of polyphone is (for example, total resistance value is 200M Ω), low resistance 2 (for example, 20k Ω tinsel resistance), grading shield 7 (for example, aluminum semisphere grading shield), base frame 8 (for example, the stainless steel base frame), silicon rubber full skirt 11, measuring lead wire 10, measurement terminal 12, by several mutually nestable that isolate mutually again and high-tension resistive post 1 concentrically ringed tubular metal screens or semiconduction screen 4 (for example, 20 aluminum foil screens), be fixed on successively from top to bottom vertically in the insulating medium and (for example form cylindric electric capacity screen layer 5, glass fiber with epoxy resin dipping twines aluminium foil successively, be cylindric, behind the dry solidification) be sleeved on the outside of high-tension resistive post 1, grading shield 7 fixedly is assemblied in the top of electric capacity screen layer 5 and (for example shields 4 with uppermost tubular metal screen or semiconduction, from first aluminum foil screen of top number) be electrically connected, base frame 8 fixedly is assemblied in the bottom of electric capacity screen layer 5 and (for example shields 4 with nethermost tubular metal screen or semiconduction, from last several the 20th aluminum foil screens) be electrically connected, the lower end of the high-tension resistive post 1 that is electrically connected with grading shield 7 links to each other with the upper end of low resistance 2, and interface passes through measuring lead wire 10 thus, be electrically connected with the measurement terminal 12 on base frame 8 panels, the lower end of low resistance 2 is electrically connected with base frame 8, and be electrically connected with ground terminal 14 on base frame 8 panels, silicon rubber full skirt 11 is closely fixing (for example, integral molded plastic) at the outside surface of electric capacity screen layer 5, filling insulating medium 9 between high-tension resistive post 1 and the electric capacity screen layer 5 (for example, insulating oil or SF6 gas).
Referring to Fig. 1, described capacitance mask resistance sensor, its several (for example, 20 cermet resistances) with high-tension resistive post 1 concentrically ringed tubular metal screen or semiconduction screen 4, use the fibre compact of resin pickup to twine vertically successively, constitute rigid cylinder shape electric capacity screen layer 5 (for example, hold the curing of aluminium foil and drying successively respectively then be rigid cylinder shape electric capacity screen layer) with the glass fibre of epoxy resin dipping.
Referring to Fig. 1, described a kind of capacitance mask resistance sensor, the insulating medium 9 of its filling between high-tension resistive post 1 and electric capacity screen layer 5 are insulating mediums (for example, insulating oil or SF6 gas) of gas, liquid or solid.
Referring to Fig. 2, the another kind of embodiment of capacitance mask resistance sensor of the present invention shown in it, (for example, the 110kV capacitance mask resistance sensor). comprise the high-tension resistive post 1 (for example total resistance value is 110M Ω) of contacting and forming by web member 6 (for example being fixed on the helicitic texture spare on the resistive element) by several resistive elements 3 (for example 20 cermet resistances) in the middle of placing, insulated leg 13 (for example support member made from epoxy resin or nylon), grading shield 7 (for example aluminum semisphere grading shield), base frame 8 (for example stainless steel base frame), silicon rubber full skirt 11, measuring lead wire 10, measurement terminal 12, by several mutually nestable that isolate mutually again and high-tension resistive post 1 concentrically ringed tubular metal screens or semiconduction screen 4 (for example, 20 aluminum foil screens), be fixed on successively from top to bottom vertically in the insulating medium and (for example form cylindric electric capacity screen layer 5, glass fiber with epoxy resin dipping twines aluminium foil successively, be cylindric, behind the dry solidification), be sleeved on the outside of high-tension resistive post 1, grading shield 7 is fixed on the top of electric capacity screen layer 5 and (for example shields 4 with uppermost tubular metal screen or semiconduction, from first aluminum foil screen of top number) be electrically connected, base frame 8 is fixed on the bottom of electric capacity screen layer 5 and (for example shields 4 with nethermost tubular metal screen or semiconduction, from top several the 20th aluminum foil screens) be electrically connected, the other end of the high-tension resistive post 1 that is electrically connected with grading shield 7 is insulated bearing 13 and is mechanically anchored on the base frame 8, and be electrically connected with measurement terminal 12 on base frame 8 panels by measuring lead wire 10, ground terminal 14 on base frame 8 panels firmly is connected on the base frame 8, the outside surface that silicon rubber full skirt 11 closely is fixed on electric capacity screen layer 5 (for example, integral molded plastic), filling insulating medium 9 between high-tension resistive post 1 and the electric capacity screen layer 5 (for example, insulating oil or SF6 gas).
It is pointed out that the foregoing description only is explanation and understands the present invention, and be not to be limitation of the invention that protection scope of the present invention should be determined by the technical scheme of each claim.
Claims (4)
1. capacitance mask resistance sensor, comprise the high-tension resistive post (1) of contacting and forming by web member (6) by several resistive elements (3) in the middle of placing, low resistance (2), grading shield (7), base frame (8), silicon rubber full skirt (11), measuring lead wire (10), measurement terminal (12), it is characterized in that: form cylindric electric capacity screen layer (5) in the insulating medium by several nestable mutually isolate mutually again being fixed on successively from top to bottom vertically with concentrically ringed tubular metal screen of high-tension resistive post (1) or semiconduction screen (4), be sleeved on the outside of high-tension resistive post (1), grading shield (7) is fixed on the top of electric capacity screen layer (5) and is connected with uppermost tubular metal screen or semiconduction screen electricity (4), base frame (8) is fixed on the bottom of electric capacity screen layer (5) and is electrically connected with nethermost tubular metal screen or semiconduction screen (4), the lower end of the high-tension resistive post (1) that is electrically connected with grading shield (7) links to each other with the upper end of low resistance (2), and interface passes through measuring lead wire (10) thus, be electrically connected with the measurement terminal (12) on base frame (8) panel, the lower end of low resistance (2) is electrically connected with base frame (8), and be electrically connected with ground terminal (14) on base frame (8) panel, silicon rubber full skirt (11) closely is fixed on the outside surface of electric capacity screen layer (5), filling insulating medium (9) between high-tension resistive post (1) and the electric capacity screen layer (5).
2. the described a kind of capacitance mask resistance sensor of claim 1 is characterized in that: several twine with the fibre compact of resin pickup successively vertically with the concentrically ringed tubular metal screen of high-tension resistive post (1) or semiconduction screen (4) and constitute rigid cylinder shape electric capacity screen layer (5).
3. the described a kind of capacitance mask resistance sensor of claim 1, it is characterized in that: filling insulating medium (9) between high-tension resistive post (1) and electric capacity screen layer (5) is the insulating medium of gas, liquid or solid.
4. capacitance mask resistance sensor, comprise the high-tension resistive post (1) of contacting and forming by web member (6) by several resistive elements (3) in the middle of placing, insulated leg (13), grading shield (7), base frame (8), silicon rubber full skirt (11), measuring lead wire (10), measurement terminal (12), it is characterized in that: form cylindric electric capacity screen layer (5) in the insulating medium by several nestable mutually isolate mutually again being fixed on successively from top to bottom vertically with concentrically ringed tubular metal screen of high-tension resistive post (1) or semiconduction screen (4), be sleeved on the outside of high-tension resistive post (1), grading shield (7) is fixed on the top of electric capacity screen layer (5) and is electrically connected with uppermost tubular metal screen or semiconduction screen (4), base frame (8) is fixed on the bottom of electric capacity screen layer (5) and is electrically connected with nethermost tubular metal screen or semiconduction screen (4), the lower end of the high-tension resistive post (1) that is electrically connected with grading shield (7) is insulated bearing (13) and is mechanically anchored on the base frame (4), and be electrically connected with measurement terminal (12) on base frame (8) panel by measuring lead wire (10), ground terminal (14) on base frame (8) panel firmly is connected on the base frame (8), silicon rubber full skirt (11) closely is fixed on the outside surface of electric capacity screen layer (5), filling insulating medium (9) between high-tension resistive post (1) and the electric capacity screen layer (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610080722A CN101074972B (en) | 2006-05-15 | 2006-05-15 | Capacitance mask resistance sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610080722A CN101074972B (en) | 2006-05-15 | 2006-05-15 | Capacitance mask resistance sensor |
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| CN101074972A CN101074972A (en) | 2007-11-21 |
| CN101074972B true CN101074972B (en) | 2010-05-12 |
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| CN200610080722A Expired - Fee Related CN101074972B (en) | 2006-05-15 | 2006-05-15 | Capacitance mask resistance sensor |
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| CN106019199B (en) * | 2016-06-30 | 2019-12-27 | 中国电力科学研究院 | Annular capacitive voltage divider for linearity calibration of impulse voltage divider |
| CN107271740B (en) * | 2017-06-02 | 2020-04-14 | 华立科技股份有限公司 | Manufacturing method of high-voltage sampling device |
| CN107170581A (en) * | 2017-06-14 | 2017-09-15 | 国网湖北省电力公司电力科学研究院 | A kind of pico farad level minitype high voltage is without partial discharge capacitor |
| CN107870260A (en) * | 2017-12-15 | 2018-04-03 | 武汉东硕电气有限公司 | One kind metering takes can integrated high-accuracy voltage sensor |
| CN109991463A (en) * | 2019-04-19 | 2019-07-09 | 河北润志电气设备有限公司 | A kind of AC voltage sensor |
| CN112180137B (en) * | 2020-09-28 | 2022-05-20 | 国网山东省电力公司莱芜供电公司 | High-precision voltage measurement method for capacitive voltage-dividing voltage transformer |
| CN115656606A (en) * | 2022-10-27 | 2023-01-31 | 常州博瑞电力自动化设备有限公司 | Voltage transformer |
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