CN204649819U - A kind of capacitive divider - Google Patents
A kind of capacitive divider Download PDFInfo
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- CN204649819U CN204649819U CN201520382423.4U CN201520382423U CN204649819U CN 204649819 U CN204649819 U CN 204649819U CN 201520382423 U CN201520382423 U CN 201520382423U CN 204649819 U CN204649819 U CN 204649819U
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- capacitive divider
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- metal electrode
- insulation crust
- metal flange
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 95
- 239000002184 metal Substances 0.000 claims abstract description 95
- 238000009413 insulation Methods 0.000 claims abstract description 32
- 238000013016 damping Methods 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 13
- 239000004020 conductor Substances 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 6
- 239000004411 aluminium Substances 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 description 12
- 230000005684 electric field Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model provides a kind of capacitive divider, and described capacitive divider comprises hollow insulation crust, coaxial-symmetrical is located at the metal flange outside described insulation crust two ends and the metal electrode inside two ends; The metal electrode at two ends is connected with the metal flange at two ends respectively, wherein one end metal flange is fixed with concentric grading ring as high-pressure side, relative to the other end metal flange of high-pressure side as low pressure end, low-voltage arm, data acquisition unit and wireless data transmitter are installed in the metal electrode of high-pressure side or low pressure end.The capacitive divider structure simple rigid that the utility model provides, be convenient to transport, stable performance, can further improve stability and the practicality of capacitive divider scale factor.
Description
Technical field
The utility model relates to a kind of voltage divider, specifically relates to a kind of for measuring surge voltage signal, with the capacitive divider calibrated the linearity of impacting voltage measuring apparatus and detect.
Background technology
The surge voltage of the power equipment of withstand voltage test be the lightning impulse voltage that suffers of simulation power system transmission line and folding disconnecting link time the operating impulse voltage that produces.Often need amplitude and the time parameter of measuring surge voltage in this process of the test, the impulse voltage divider in measuring system is voltage conversion device, and being converted to by high-voltage impact voltage signal can for the low-voltage signal of double measurement measurement device.
Impulse voltage divider is mainly divided into resitstance voltage divider, capacitive divider two kinds, it is excellent that resitstance voltage divider has step response, wave form distortion is little, the advantages such as scale factor good stability, but due to the reason of resistance wire heating, the electric pressure of resitstance voltage divider is generally below 1000kV, and can only be used for measuring lightning impulse voltage.The domestic and international impulse voltage divider higher than 1000kV mostly adopts capacitive divider at present.Capacitive divider dielectric loss is little, does not generate heat, and due to the impact of the stray inductance on loop, causes wave form distortion to be vibrated, and in order to damping circuit vibration, has developed the voltage divider of capacitance-resistance series connection.
Fig. 1 is the principle schematic of current RC divider high-voltage arm, high-voltage arm is composed in series by resistance capacitance, the noninductive resistance that the impulse capacitor of electric capacity use paper oil insulation, resistance are Double-wire parallel wound, because the waveform wavefront stage is capacitive divider, the wave rear stage is mainly electric resistance partial pressure, and therefore electric capacity is substantially identical with the withstand voltage design of resistance.The electric capacity of current high-voltage arm is generally 400pF, and capacitive divider is subject to the impact of stray capacitance, and the electric capacity stability of the impulse capacitor of paper oil insulation is bad in addition, and dielectric loss is larger.Low-voltage arm electric capacity generally uses lumped capacitance (thin-film electro is mica capacitor perhaps), and cable input end carries out Impedance matching design.Because the medium of height pressure arm is different, its temperature coefficient and voltage coefficient are not identical yet, and the fluctuation of scale factor is comparatively large, and generally can only ensure the accuracy of 3%, the linearity cannot ensure, can not be used for measuring transient signal as standard voltage divider.
In view of above-mentioned background, need to provide a kind of structure simple, convenient transportation, stable performance, and the capacitive divider that between voltage divider and equipment or voltage divider, coupling capacitance affect can be eliminated, calibrate for the linearity of carrying out more than 1000kV impulse voltage divider.
Utility model content
In order to solve above-mentioned deficiency existing in prior art, the utility model provides a kind of structure simple rigid, and be convenient to transport, the capacitive divider of the new structure of stable performance, to improve stability and the practicality of capacitive divider scale factor further.
The technical scheme that the utility model provides is: a kind of capacitive divider, and its improvements are: described capacitive divider comprises hollow insulation crust, coaxial-symmetrical is located at the metal flange outside described insulation crust two ends and the metal electrode inside two ends; The metal electrode at two ends is connected with the metal flange at two ends respectively, wherein one end metal flange is fixed with concentric grading ring as high-pressure side, relative to the other end metal flange of high-pressure side as low pressure end, low-voltage arm, data acquisition unit and wireless data transmitter are installed in the metal electrode of high-pressure side or low pressure end.
Preferably, described metal electrode is conical, and one end that its cross-sectional area is larger is detachably connected on described metal flange medial surface.
Further, the metal electrode of high-pressure side or low pressure end is bulk metal aluminium electrode, concentricityly relative to less one end of cross-sectional area of the metal electrode of the bulk metal aluminium electrode other end is provided with metallic conductor and the insulating material ring between described metallic conductor and metal electrode.
Further, the edge of one end that described metal electrode cross-sectional area is less is in curved surface protruding laterally.
Preferably, between described insulation crust and described metal electrode, 3 atmospheric SF6 gases are filled with between described low-voltage arm and described metal electrode.
Preferably, described low-voltage arm and described data acquisition unit and wireless data transmitter are separately fixed at the both sides of the back up pad perpendicular to described insulation crust axis.
Preferably, described insulation crust is right cylinder, and described metal flange is arranged on described insulation crust two ends by holding screw, is also provided with air seal circle between described metal flange and described insulation crust.
Preferably, described metal flange is fixed with rain glass and gas admittance valve.
Preferably, the outer middle side part of the metal flange of high-pressure side is vertically provided with damping resistance, and described damping resistance is connected with high-voltage connection, the metal flange ground connection of low pressure end.
Further, described high-voltage connection is metal guide rod.
Compared with immediate technical scheme, the utility model has following marked improvement:
(1) compared to traditional capacitance-resistance capacitive divider, capacitive divider structure provided by the invention is simple, installation and transportation convenient, stable performance.
(2) data acquisition unit is built-in, adopting wireless signal transmitter to transmit data, without measuring cable, not needing to carry out impedance matching, eliminates the problem of signal refraction and reflection.
(3) capacitive divider is symmetrical structure, grading ring can be arranged on the metal flange of capacitive divider any one end up and down, and the metal flange installing grading ring is connected with high-voltage connection by damping resistance, using the high-pressure side as capacitive divider, the other end is as the low pressure end of capacitive divider, this structure makes the high-pressure side of capacitive divider and low pressure end to exchange arbitrarily, easy to use.
(4) metal electrode is conical design, and one end that its cross-sectional area is larger is fixed on inside metal flange, can the upper and lower Potential distribution of uniform insulation shell.Do not need the flange designing homogeneous potential distribution.
(5) metal electrode is conical design, and the edge of the less one end of its cross-sectional area, can uniform electric field in annular protruding laterally, improves the stability of capacitive divider.
(6) insulation crust one end that wherein metal electrode cross-sectional area in one end is less is concentricity is provided with metallic conductor and the insulating material ring between metallic conductor and metal electrode, high voltage arm capacitor is made to be placed between mask capacitor, not by the impact of extraneous stray capacitance, improve the stability of capacitive divider.
Between insulation crust and metal electrode (7), be filled with 3 atmospheric SF6 gases between low-voltage arm and metal electrode, make height pressure arm be placed in identical medium, voltage coefficient is identical with temperature coefficient, and the change of scale factor is little.
Accompanying drawing explanation
Fig. 1 is existing RC divider high-voltage arm schematic diagram;
The capacitive divider structural representation that Fig. 2 provides for the utility model;
The capacitive divider electronic schematic diagram that Fig. 3 provides for the utility model;
Wherein: 1-grading ring I, 2-metal flange I, 3-insulation crust, 4-metal electrode I, 5-center conductor, 6-insulating material ring, 7-low-voltage arm, 8-metal electrode II, 9-data acquisition unit and wireless signal transmitter, 10-grading ring II, 11-metal flange II, 12-damping resistance, 13-high-voltage connection, 14-rain glass, 15-gas admittance valve, C
0-mask capacitor, C
1-high voltage arm capacitor, C
2-low-voltage arm electric capacity.
Embodiment
In order to understand the utility model better, below in conjunction with Figure of description and example, content of the present utility model is described further:
As shown in Figure 2, the entirety of the capacitive divider that the utility model provides is cylindrical symmetry, by grading ring, insulation crust, metal electrode I, metal electrode II, metal flange I, metal flange II, low-voltage arm, data acquisition unit, wireless signal transmitter, damping resistance, high-voltage connection, rain glass, the compositions such as gas filling valve.
Wherein insulation crust is the cylinder blanket that epoxy material makes, and its size is according to the rated voltage meter of voltage divider.
Metal flange is coaxially arranged on insulation crust two ends, for fixed metal electrode, damping resistance and grading ring.Metal flange is flexibly connected with insulation crust by holding screw, easy installation and removal, in order to ensure the impermeability of insulation crust, between metal flange and insulation crust, is also provided with air seal circle.
Grading ring is concentricity to be fixed on the metal flange of any one end of insulation crust, and the one end being fixed with grading ring in voltage divider is the high-pressure side of voltage divider, and the other end is low pressure end, this make the high-pressure side of voltage divider and low pressure end interchangeable, easy to use; Grading ring is used for even voltage divider high-pressure side electric field, and weaken corona, the diameter of grading ring is determined according to the rated voltage of voltage divider.
Damping resistance is vertically fixed in the middle part of the metal flange of voltage divider high-pressure side, and is connected with high-voltage connection; Damping resistance is used for the vibration that damping causes because of the stray inductance of high-pressure conduit, and high-voltage connection adopts metal guide rod, and stray inductance is low, and damping resistance is little.
Rain glass and gas filling valve are arranged on metal flange.Rain glass is used for the air pressure of the inner SF6 gas of watch-dog; Gas filling valve is connected with gas cylinder, for ventilation or make-up gas.
Metal electrode is conical design, one end that its cross-sectional area is larger is detachably connected on metal flange medial surface, can uniform insulation shell along the Potential distribution in face, the angle of metal electrode and insulation crust is according to voltage divider rated voltage, and the factors such as high voltage arm capacitor amount, Electric Field Distribution calculate.
Metal electrode I is bulk metal aluminium electrode, the built-in center conductor of top middle portion of metal electrode II, with insulating material ring (such as nylon ring) isolation between center conductor and metal electrode II.For increasing radius-of-curvature, uniform electric field, the edge of the less one end of metal electrode cross-sectional area is processed into circular.Fill between insulation crust and electrode, between low-voltage arm and electrode 2 with 3 atmospheric SF6 gases.
The inside of metal electrode II is provided with back up pad, for fixing low-voltage arm, data acquisition unit and wireless signal transmitter; Low-voltage arm, data acquisition unit and wireless signal transmitter also can be arranged in metal electrode I.
The electronic schematic diagram that in Fig. 1, capacitive divider is formed as shown in Figure 2, will form high voltage arm capacitor C between the center conductor of metal electrode I and metal electrode II
1, between metal electrode I and metal electrode II, mask capacitor C will be formed
0, ensure high voltage arm capacitor C
1the stability of capacitance.Electric field approaches uniformity electric field between metal electrode I and center conductor.When the external world exists other electrified bodys, the coupling capacitance of voltage divider and other charged objects only changes mask capacitor C
0electric capacity.
It is inner that data acquisition unit and wireless signal transmitter are placed in metal electrode II, in use, the metal flange ground connection of low pressure end, high-voltage connection connects impulse voltage generator and capacitive divider, voltage on data acquisition unit acquires low-voltage arm electric capacity C2, and by wireless signal transmitter, voltage signal is transferred to PC, carry out data computation and analysis by PC, do not need to carry out impedance matching.
These are only embodiment of the present utility model, be not limited to the utility model, all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all applying within the right of the present utility model awaited the reply.
Claims (10)
1. a capacitive divider, is characterized in that: described capacitive divider comprises hollow insulation crust, coaxial-symmetrical is located at the metal flange outside described insulation crust two ends and the metal electrode inside two ends; The metal electrode at two ends is connected with the metal flange at two ends respectively, wherein one end metal flange is fixed with concentric grading ring as high-pressure side, relative to the other end metal flange of high-pressure side as low pressure end, low-voltage arm, data acquisition unit and wireless data transmitter are installed in the metal electrode of high-pressure side or low pressure end.
2. a kind of capacitive divider as claimed in claim 1, is characterized in that:
Described metal electrode is conical, and one end that its cross-sectional area is larger is detachably connected on described metal flange medial surface.
3. a kind of capacitive divider as claimed in claim 2, is characterized in that:
The metal electrode of high-pressure side or low pressure end is bulk metal aluminium electrode, concentricityly relative to less one end of cross-sectional area of the metal electrode of the bulk metal aluminium electrode other end is provided with metallic conductor and the insulating material ring between described metallic conductor and metal electrode.
4. a kind of capacitive divider as claimed in claim 2, is characterized in that:
The edge of one end that described metal electrode cross-sectional area is less is in curved surface protruding laterally.
5. a kind of capacitive divider as claimed in claim 1, is characterized in that:
3 atmospheric SF6 gases are filled with between described insulation crust and described metal electrode, between described low-voltage arm and described metal electrode.
6. a kind of capacitive divider as claimed in claim 1, is characterized in that:
Described low-voltage arm and described data acquisition unit and wireless data transmitter are separately fixed at the both sides of the back up pad perpendicular to described insulation crust axis.
7. a kind of capacitive divider as claimed in claim 1, is characterized in that:
Described insulation crust is right cylinder, and described metal flange is arranged on described insulation crust two ends by holding screw, is also provided with air seal circle between described metal flange and described insulation crust.
8. a kind of capacitive divider as claimed in claim 1, is characterized in that:
Described metal flange is fixed with rain glass and gas admittance valve.
9. a kind of capacitive divider as claimed in claim 1, is characterized in that:
The outer middle side part of the metal flange of high-pressure side is vertically provided with damping resistance, and described damping resistance is connected with high-voltage connection, the metal flange ground connection of low pressure end.
10. a kind of capacitive divider as claimed in claim 9, is characterized in that:
Described high-voltage connection is metal guide rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520382423.4U CN204649819U (en) | 2015-06-04 | 2015-06-04 | A kind of capacitive divider |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520382423.4U CN204649819U (en) | 2015-06-04 | 2015-06-04 | A kind of capacitive divider |
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| Publication Number | Publication Date |
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| CN204649819U true CN204649819U (en) | 2015-09-16 |
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| CN201520382423.4U Active CN204649819U (en) | 2015-06-04 | 2015-06-04 | A kind of capacitive divider |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019199A (en) * | 2016-06-30 | 2016-10-12 | 中国电力科学研究院 | Annular capacitive voltage divider for linearity calibration of impact voltage divider |
| CN106556726A (en) * | 2015-09-29 | 2017-04-05 | 中国电力科学研究院 | A kind of standard DC voltage divider on the floating ground of low-pressure end |
| WO2017071333A1 (en) * | 2015-10-29 | 2017-05-04 | 中国电力科学研究院 | Capacitive voltage divider |
| CN108627786A (en) * | 2017-03-22 | 2018-10-09 | 中国电力科学研究院 | Different voltages waveform subscript quasi-electric field generating means and electric field measuring apparatus calibrating installation |
-
2015
- 2015-06-04 CN CN201520382423.4U patent/CN204649819U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106556726A (en) * | 2015-09-29 | 2017-04-05 | 中国电力科学研究院 | A kind of standard DC voltage divider on the floating ground of low-pressure end |
| CN106556726B (en) * | 2015-09-29 | 2019-07-23 | 中国电力科学研究院 | A kind of standard DC voltage divider on the floating ground of low-pressure end |
| WO2017071333A1 (en) * | 2015-10-29 | 2017-05-04 | 中国电力科学研究院 | Capacitive voltage divider |
| GB2556853A (en) * | 2015-10-29 | 2018-06-06 | China Electric Power Res Institute Company Limited | Capacitive voltage divider |
| GB2556853B (en) * | 2015-10-29 | 2021-09-22 | China Electric Power Res Institute Company Limited | Capacitive voltage divider |
| DE112016004925B4 (en) | 2015-10-29 | 2022-03-31 | China Electric Power Research Institute Company Limited | Capacitive voltage divider |
| CN106019199A (en) * | 2016-06-30 | 2016-10-12 | 中国电力科学研究院 | Annular capacitive voltage divider for linearity calibration of impact voltage divider |
| 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 |
| CN108627786A (en) * | 2017-03-22 | 2018-10-09 | 中国电力科学研究院 | Different voltages waveform subscript quasi-electric field generating means and electric field measuring apparatus calibrating installation |
| CN108627786B (en) * | 2017-03-22 | 2020-10-09 | 中国电力科学研究院 | Electric field measuring instrument calibrating device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |