CN204177837U - A kind of novel fully-sealed electromagnetic screen impedance box - Google Patents
A kind of novel fully-sealed electromagnetic screen impedance box Download PDFInfo
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- CN204177837U CN204177837U CN201420654716.9U CN201420654716U CN204177837U CN 204177837 U CN204177837 U CN 204177837U CN 201420654716 U CN201420654716 U CN 201420654716U CN 204177837 U CN204177837 U CN 204177837U
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- 230000005684 electric field Effects 0.000 claims abstract description 43
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 229910001220 stainless steel Inorganic materials 0.000 claims description 15
- 239000010935 stainless steel Substances 0.000 claims description 15
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 10
- 239000003822 epoxy resin Substances 0.000 claims description 8
- 229920000647 polyepoxide Polymers 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 7
- 239000007769 metal material Substances 0.000 claims description 4
- 239000000428 dust Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 13
- 230000007246 mechanism Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000036039 immunity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- -1 siliconized plate Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Abstract
A kind of novel fully-sealed electromagnetic screen impedance box, comprise box body and base, the outside of base is along the circumferential direction respectively equipped with earth terminal, chassis outer side measuring junction coax jack and chassis outer side signal end coax jack, box body comprises the sheathed electric field shielding cover in interval and magnetic field shielding case, electric field shielding cover is positioned at outside magnetic field shielding case, the top of magnetic field shielding case and be provided with interval between periphery and electric field shielding cover, the bottom of electric field shielding cover and magnetic field shielding case is equipped with opening, the utility model is more applicable for the ac high voltage signal measurement of complicated site test environment, not by extraneous factor (electromagnetic environment when can accomplish to measure for a long time, sleet dust storm, field wiring, placement location etc.) impact.
Description
Technical field
The utility model relates to the test unit field measured ac high voltage signal, relates in particular to a kind of test unit measured transformer substation system debugging ac high voltage signal.
Background technology
At present, high voltage signal measures the general complete resistance divider, condenser divider or the resistance-capacitance type voltage divider arrangement that adopt producer to manufacture.Practical experience shows: resistance divider, quality requirements for resistive element is very high, even if there is place surface-discharge in the resistive film of element all will cause the overall misalignment of resitstance voltage divider or inefficacy, long-time stability are poor, manufacturing cost is high, and poorer with electric pressure its response characteristic higher, seldom use now; For capacitive divider, substantially do not consume the interchange active power of measuring object, namely can not consider operational heat, and owing to dividing a pressure arm to be electric capacity, therefore can not affect transient response time yet.Usually be only concerned about the no-load voltage ratio coefficient of voltage divider, this no-load voltage ratio coefficient is not substantially by frequency influence; For RC divider, because the stray inductance of resistance affects, the no-load voltage ratio coefficient of voltage divider is with frequency significant change, and therefore condenser divider is better than RC divider frequency characteristic.The intrinsic standoff ratio of condenser divider, by the impact comparatively large (external electric field or insulating surface are revealed) of capacity cell distributed capacitance over the ground, should consider to reduce the capacitive coupling with nearby device.
In addition, according to the needs of in-site measurement reality, sometimes need to get voltage signal from multiple stage Transformer Bushing Tap, capacitance type potential transformer end, many circuits or multiple stage dry type parallel reactor head end, complete voltage divider measurement mechanism cannot be adopted in a lot of situation to measure, therefore, a lot of scientific and technological test mechanism adopts designed, designed suitable impedance box customized mostly, form measuring circuit with test product, carried out the measurement of high voltage signal by condenser divider or resistance-capacitance type voltage divider measuring principle.The general impedance box customized generally adopts single layer designs, sealing is also poor, by peripheral electromagnetic field environmental factor and inside even from weather larger, not too be applicable to long-time signals collecting, bad placement is affected by wiring, geographical environment during measurement, reliability is poor, is unfavorable for promoting the use of in electric system.
Utility model content
The purpose of this utility model is to provide a kind of novel fully-sealed electromagnetic screen impedance box, be more applicable for the ac high voltage signal measurement apparatus of the on-the-spot complex environment of electrical test, not by extraneous factor (electromagnetic environment, sleet dust storm, field wiring, placement location etc.) impact when can accomplish to measure for a long time.
The technical solution of the utility model is:
A kind of novel fully-sealed electromagnetic screen impedance box, comprise box body and base, the outside of base is along the circumferential direction respectively equipped with earth terminal, chassis outer side measuring junction coax jack and chassis outer side signal end coax jack, box body comprises the sheathed electric field shielding cover in interval and magnetic field shielding case, electric field shielding cover is positioned at outside magnetic field shielding case, the top of magnetic field shielding case and be provided with interval between periphery and electric field shielding cover, the bottom of electric field shielding cover and magnetic field shielding case is equipped with opening, electric field shielding cover is metal material, the base of electric field shielding cover is connected on the outermost edge of base, the outermost edge of base adopts metal material, earth terminal, the screen layer of chassis outer side measuring junction coax jack and the screen layer of chassis outer side signal end coax jack on the outermost edge of base and base are all electrically connected commonly, magnetic field shielding case bottom side edge is along being connected with bottom shrouding, and the upper surface of bottom shrouding is vertically connected with the silicon steel wall of annular, the bottom of magnetic field shielding case medial surface and the lateral surface of silicon steel wall fit tightly, the upside of bottom shrouding is connected with epoxy resin substrate, and epoxy resin substrate is provided with measures electronic component and circuit, forms confined space between magnetic field shielding case and bottom shrouding, bottom shrouding is provided with three fairleads, measurement electronic component and circuit are connected with wire, and wire is each passed through three fairleads and is then connected with the earth terminal on base, chassis outer side measuring junction coax jack and chassis outer side signal end coax jack respectively, electronic component and circuit comprise capacity cell mounting groove, release energy resistance, over-pressure safety device and matched impedance, capacity cell mounting groove is multiple-grooved parallel-connection structure, in capacity cell mounting groove, capacity cell is installed, after some capacity cell parallel connections again with release and resistance, overvoltage protection can compose in parallel and in parallelly measure branch road, the two ends measuring branch road in parallel are connected with signal end coax jack and earth terminal respectively, and branch road of measuring in parallel is connected with matched impedance and is connected with measuring junction coax jack.
The vertical cross-section shape of electric field shielding cover and magnetic field shielding case is all in " U " shape.
Electric field shielding cover adopts stainless steel material.
The material of base outermost side is stainless steel material.
Be provided with the first snak link between the base of electric field shielding cover and the outermost edge of base, the base of electric field shielding cover is connected with the outermost edge of base by the first snak link.
The second snak link for fixed magnetic field radome is provided with between the edge, upper strata of base and magnetic field shielding case.
Silicon steel wall is annular.
The orlop of base is fixedly connected with magnet.
The aperture of three fairleads is suitable with the wire diameter of the wire passed.
By adopting the material such as stainless steel, siliconized plate, epoxy resin and magnetic material, using modular design, double-layer seal arrangement, farthest eliminating electromagnetic environment to the impact of measuring ac high voltage signal, strong interference immunity, accuracy are high; Dust-proof damp proof, do not affect by weather condition, not easily get rusty; Modular design, is easy to assembling, is easy to free allocating and measuring electric capacity, is easy to wiring; Base is configured with magnetic material, and can conveniently be fixed on any metal flat, practical is extremely strong.
The utility model is more applicable for the ac high voltage signal measurement of complicated site test environment, by extraneous factor (electromagnetic environment, sleet dust storm, field wiring, placement location etc.) impact when can accomplish to measure for a long time, strong interference immunity, accuracy be high, dust-proof damp proof, not easily get rusty, be easy to assembling, be easy to wiring, convenient fixing.
The beneficial effects of the utility model are:
(1) this device is by outer electric field shielding cover and the double-deck hermetically sealed layout (comprise electronic component bottom and also adopt magnetic field shielding layer and electric field shielding layer rebuilding) of internal layer magnetic field shielding case, farthest eliminate electromagnetic environment to the impact of measuring ac high voltage signal, anti-electromagnetic interference capability is strong, accuracy of measurement is high.
(2) the outer electric field shielding cover of this device and base outer surface use stainless steel material compacting to form, and sealing is strong, dust-proof damp proof, can not affect, not easily get rusty in long-time measuring process by inclement weather conditions such as sleet dusts storm.
(3) this device adopts modular design, is made up of 3 unit (electric field shielding cover, magnetic field shielding case, base) and annex (capacity cell), is easy to assemble, can free allocating and measuring electric capacity, easy-to-connect are reliable according to actual needs.
(4) this device pedestal is configured with magnetic material, and can conveniently be fixed on any metal flat, practical is extremely strong.
Accompanying drawing explanation
Fig. 1 is front view of the present utility model;
Fig. 2 is electric field shielding cover structure figure of the present utility model;
Fig. 3 is magnetic field shielding case structural drawing of the present utility model;
Fig. 4 is base schematic diagram of the present utility model;
Fig. 5 is base vertical view of the present utility model;
In figure: 1, fully-sealed electric magnetic shielding impedance box, 2, electric field shielding cover, 3, magnetic field shielding case, 4, base, 5, epoxy resin substrate, 6, electronic component and circuit, 7, for the snak link of fixed magnetic field radome, 8, silicon steel wall, 9, for the snak link of stationary electric field radome, 10, magnetic field shielding case bottom shrouding (making three fairleads), 11, measuring junction coax jack, 12, signal end coax jack, 13, earth terminal, 14, stainless steel wall, 15, magnet, 16, wire, 17, capacity cell mounting groove, 18, release energy resistance, 19, over-pressure safety device, 20, matched impedance, 21, fairlead, 22, capacity cell.
Embodiment
As shown in Figure 1, the utility model comprises box body 1 and base 4, adopts modular design, double-layer seal arrangement.The outside of base 4 is along the circumferential direction respectively equipped with earth terminal 13, chassis outer side measuring junction coax jack 11 and chassis outer side signal end coax jack 12.
As shown in Figure 2,3, 4, box body 1 comprises the electric field shielding cover 2 and magnetic field shielding case 3 that interval is set-located, and electric field shielding cover 2 is positioned at outside magnetic field shielding case 3, the surrounding of electric field shielding cover 2 and all have certain spacing between top and magnetic field shielding case 3.Shape and " clock " shape approximation of electric field shielding cover 2 and magnetic field shielding case 3.
It is U-shaped that electric field shielding cover 2 uses stainless steel material to be pressed into, fixed by 3 first snak links 9 of outermost layer edge on base 4 for stationary electric field radome 2 in use, directly can cover the whole measurement electronic component and circuit 6 that are wrapped up by magnetic field shielding case 3, stainless steel wall 14 radius along radius ratio base 4 under it is bigger, the earth terminal 13 on the contact stainless steel wall 14 of base 4 and base can be fitted tightly, measuring junction coax jack 11 and signal end coax jack 12, realize the electrical connection with the stainless steel wall 14 of base 4, and stainless steel wall 14 and the earth terminal 13 on base 4, the screen layer of chassis outer side measuring junction coax jack 11 screen layer and chassis outer side signal end coax jack 12 has electrical connection altogether, farthest eliminate external electrical field environment and weather (sleet dust storm) impact on measurement mechanism.
Magnetic field shielding case 3 bottom side edge is called for short bottom shrouding along being connected with magnetic field shielding case bottom shrouding 10().Bottom shrouding 10 can be fixedly connected on base 4.
Bottom shrouding 10 is vertically provided with the silicon steel wall 8 of annular.Base 4 is cylindrical.
It is U-shaped that magnetic field shielding case 3 uses silicon steel material to be pressed into, fixed by 3 second snak links 7 of edge, base 4 upper strata for fixed magnetic field radome in use, the radius of magnetic field shielding case 3 radius ratio silicon steel wall 8 is bigger, contact silicon steel wall 8 can be fitted tightly, three fairleads 21 are made with magnetic field shielding case bottom shrouding 10() form confined space, directly can cover whole measurement electronic component and circuit 6.
As shown in Figure 4, base 4 is double-decker.Bottom shrouding 10 is connected on the upside of base 4.The upper side of bottom shrouding 10 is glued with epoxy resin substrate 5, whole measurement electronic component and circuit 6 are placed on epoxy resin substrate 5, bottom shrouding 10 and magnetic field shielding case 3 form confined space, completely whole measurement electronic component and circuit 6 are wrapped up wherein, and do not have any electrical contact with electric field shielding cover 2 and stainless steel wall 14, farthest eliminate the impact of external magnetic field environment on measurement mechanism.Three fairleads 21 that the wire 16 of electronic component and circuit 6 makes on magnetic field shielding case bottom shrouding 10 enter in the lower layer space of base 4, go to the earth terminal 13 on base, chassis outer side measuring junction coax jack 11 and chassis outer side signal end coax jack 12 respectively, base 4 orlop fixes one block of magnet 15, plays firm effect of adsorbing metal surface near test product arbitrarily.
As shown in Figure 5, electronic component and circuit 6 comprise capacity cell mounting groove 17, release energy resistance 18, over-pressure safety device 19, matched impedance 20, capacity cell mounting groove 17 is multiple-grooved parallel-connection structure, multiple small capacitances element 22 parallel combination can be freely inserted according to measurement actual needs, also can realize freely removing replacement when certain 1 small capacitances component wear, realize the flexible of measuring circuit; Release the quick release that energy resistance 18 realizes the energy be stored in electric capacity, thus the measurement of quick response tracking is realized to change in voltage; Over-pressure safety device 19 can farthest protect whole measuring circuit when measuring and meeting with abnormal; Matched impedance 20 matches with the resistance value of concentric cable, avoids the catadioptric of measuring process medium wave as far as possible, causes the decay of signal.
After the parallel connection of multiple capacity cell 22 again with release and resistance 18, overvoltage protection 19 can compose in parallel and in parallelly measure branch road; this parallel connection is measured branch road one end and is introduced signal by signal end coax jack 12; the other end draws ground connection by earth terminal jack 13, and this parallel connection is simultaneously measured after branch road is connected with matched impedance 20 and drawn measuring-signal by measuring junction concentric cable 11.
Electric field shielding cover 2 has electrical connection altogether with the screen layer of earth terminal 13, chassis outer side measuring junction coax jack 11 screen layer and chassis outer side signal end coax jack 12 on stainless steel wall 14, base, farthest eliminates the impact of external electrical field environment on measurement mechanism.
The radius of magnetic field shielding case 3 radius ratio silicon steel wall 8 is bigger, the silicon steel wall 8 of contact base 4 can be fitted tightly, confined space is formed with magnetic field shielding case bottom shrouding 10, directly can cover whole measurement electronic component and circuit, and electric field shielding cover 2 and stainless steel wall 14 can not have any electrical contact, and farthest eliminate the impact of external magnetic field environment on measurement mechanism.
The pore size of three fairleads 21 that magnetic field shielding case bottom shrouding 10 makes just should reach the wire 16 by electronic component and circuit 6.
Above-mentioned embodiment is only used for the utility model is described, instead of limits the utility model, and any approximate change of making the utility model and amendment, all will fall in protection domain of the present utility model.
Claims (9)
1. a novel fully-sealed electromagnetic screen impedance box, it is characterized in that: comprise box body and base, the outside of base is along the circumferential direction respectively equipped with earth terminal, chassis outer side measuring junction coax jack and chassis outer side signal end coax jack, box body comprises the sheathed electric field shielding cover in interval and magnetic field shielding case, electric field shielding cover is positioned at outside magnetic field shielding case, the top of magnetic field shielding case and be provided with interval between periphery and electric field shielding cover, the bottom of electric field shielding cover and magnetic field shielding case is equipped with opening, electric field shielding cover is metal material, the base of electric field shielding cover is connected on the outermost edge of base, the outermost edge of base adopts metal material, earth terminal, the screen layer of chassis outer side measuring junction coax jack and the screen layer of chassis outer side signal end coax jack on the outermost edge of base and base are all electrically connected commonly, magnetic field shielding case bottom side edge is along being connected with bottom shrouding, and the upper surface of bottom shrouding is vertically connected with the silicon steel wall of annular, the bottom of magnetic field shielding case medial surface and the lateral surface of silicon steel wall fit tightly, the upside of bottom shrouding is connected with epoxy resin substrate, and epoxy resin substrate is provided with measures electronic component and circuit, forms confined space between magnetic field shielding case and bottom shrouding, bottom shrouding is provided with three fairleads, measurement electronic component and circuit are connected with wire, and wire is each passed through three fairleads and is then connected with the earth terminal on base, chassis outer side measuring junction coax jack and chassis outer side signal end coax jack respectively, electronic component and circuit comprise capacity cell mounting groove, release energy resistance, over-pressure safety device and matched impedance, capacity cell mounting groove is multiple-grooved parallel-connection structure, in capacity cell mounting groove, capacity cell is installed, after some capacity cell parallel connections again with release and resistance, overvoltage protection can compose in parallel and in parallelly measure branch road, the two ends measuring branch road in parallel are connected with signal end coax jack and earth terminal respectively, and branch road of measuring in parallel is connected with matched impedance and is connected with measuring junction coax jack.
2. novel fully-sealed electromagnetic screen impedance box according to claim 1, is characterized in that: the vertical cross-section shape of electric field shielding cover and magnetic field shielding case is all in " U " shape.
3. novel fully-sealed electromagnetic screen impedance box according to claim 1 and 2, is characterized in that: electric field shielding cover adopts stainless steel material.
4. novel fully-sealed electromagnetic screen impedance box according to claim 1 and 2, is characterized in that: the material of base outermost side is stainless steel material.
5. novel fully-sealed electromagnetic screen impedance box according to claim 1 and 2, it is characterized in that: be provided with the first snak link between the base of electric field shielding cover and the outermost edge of base, the base of electric field shielding cover is connected with the outermost edge of base by the first snak link.
6. novel fully-sealed electromagnetic screen impedance box according to claim 1 and 2, is characterized in that: be provided with the second snak link for fixed magnetic field radome between the edge, upper strata of base and magnetic field shielding case.
7. novel fully-sealed electromagnetic screen impedance box according to claim 1 and 2, is characterized in that: silicon steel wall is annular.
8. novel fully-sealed electromagnetic screen impedance box according to claim 1 and 2, is characterized in that: the orlop of base is fixedly connected with magnet.
9. novel fully-sealed electromagnetic screen impedance box according to claim 1 and 2, is characterized in that: the aperture of three fairleads is suitable with the wire diameter of the wire passed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420654716.9U CN204177837U (en) | 2014-11-05 | 2014-11-05 | A kind of novel fully-sealed electromagnetic screen impedance box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420654716.9U CN204177837U (en) | 2014-11-05 | 2014-11-05 | A kind of novel fully-sealed electromagnetic screen impedance box |
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| Publication Number | Publication Date |
|---|---|
| CN204177837U true CN204177837U (en) | 2015-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420654716.9U Withdrawn - After Issue CN204177837U (en) | 2014-11-05 | 2014-11-05 | A kind of novel fully-sealed electromagnetic screen impedance box |
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| CN (1) | CN204177837U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502643B (en) * | 2014-11-05 | 2017-05-31 | 国网河南省电力公司电力科学研究院 | A kind of fully-sealed electric magnetic screen impedance box |
| CN108663562A (en) * | 2018-08-07 | 2018-10-16 | 北京中科飞龙传感技术有限责任公司 | A kind of contactless cable voltage measurement sensor |
| CN109581117A (en) * | 2018-12-17 | 2019-04-05 | 国网江西省电力有限公司赣东北供电分公司 | Magnet controlled reactor shielding construction and intelligent failure diagnosis method based on big data |
| CN114325007A (en) * | 2022-01-06 | 2022-04-12 | 北京东方计量测试研究所 | Asymmetric shielding structure of four-end-pair alternating current resistance metering sample |
-
2014
- 2014-11-05 CN CN201420654716.9U patent/CN204177837U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502643B (en) * | 2014-11-05 | 2017-05-31 | 国网河南省电力公司电力科学研究院 | A kind of fully-sealed electric magnetic screen impedance box |
| CN108663562A (en) * | 2018-08-07 | 2018-10-16 | 北京中科飞龙传感技术有限责任公司 | A kind of contactless cable voltage measurement sensor |
| CN109581117A (en) * | 2018-12-17 | 2019-04-05 | 国网江西省电力有限公司赣东北供电分公司 | Magnet controlled reactor shielding construction and intelligent failure diagnosis method based on big data |
| CN114325007A (en) * | 2022-01-06 | 2022-04-12 | 北京东方计量测试研究所 | Asymmetric shielding structure of four-end-pair alternating current resistance metering sample |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150225 Effective date of abandoning: 20170531 |
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| AV01 | Patent right actively abandoned |