CN106291035A - A kind of capacitive divider - Google Patents
A kind of capacitive divider Download PDFInfo
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- CN106291035A CN106291035A CN201510303516.8A CN201510303516A CN106291035A CN 106291035 A CN106291035 A CN 106291035A CN 201510303516 A CN201510303516 A CN 201510303516A CN 106291035 A CN106291035 A CN 106291035A
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Abstract
The present invention provides a kind of capacitive divider, and described capacitive divider includes that hollow cylindrical insulation crust, coaxial-symmetrical are 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, and wherein one end metal flange is provided with concentric grading ring and along the damping resistance being connected to high-voltage connection of its axis direction as high-pressure side；Relative to the other end metal flange of high-pressure side as low-pressure end；Being provided with low-voltage arm, data acquisition unit and wireless data transmitter in the metal electrode of high-pressure side or low-pressure end, described data acquisition unit gathers the voltage at described low-voltage arm two ends, and is sent to external data processor by described wireless data transmitter.The capacitive divider simple in construction that the present invention provides is firm, it is simple to transport, stable performance, can further improve stability and the practicality of capacitive divider scale factor.
Description
Technical field
The present invention relates to a kind of potentiometer, in particular to one be used for measuring surge voltage signal, with to impact
The linearity of voltage measuring apparatus carries out the capacitive divider calibrated and detect.
Background technology
The surge voltage of the power equipment of pressure test is the lightning impulse that simulation power system transmission line suffers
The operating impulse voltage produced when voltage and folding disconnecting link.This process of the test generally requires measurement impact electricity
The amplitude of pressure and time parameter, the impulse voltage divider in measurement system is voltage conversion device, by high-voltage impact
Voltage signal is converted into the low-voltage signal being available for double measurement measurement device.
Impulse voltage divider is broadly divided into resitstance voltage divider, capacitive divider two kinds, and resitstance voltage divider has step wave
Respond excellent, the advantages such as wave distortion is little, scale factor good stability, but owing to resistance wire generates heat,
The electric pressure of resitstance voltage divider is generally below 1000kV, and is only used for measuring lightning impulse voltage.Mesh
The front impulse voltage divider being higher than 1000kV both at home and abroad mostly uses capacitive divider.Capacitive divider dielectric loss
Little, do not generate heat, due to the impact of the stray inductance on loop, cause wave distortion to be vibrated, for damping circuit
Vibration, has developed the potentiometer of capacitance-resistance series connection.
Fig. 1 is the principle schematic of current RC divider high-voltage arm, and high-voltage arm is composed in series by resistance capacitance,
Electric capacity uses the impulse capacitor of paper oil insulation, resistance to be the noninductive resistance of Double-wire parallel wound, due to waveform wavefront rank
Section is capacitive divider, and the wave rear stage is mainly electric resistance partial pressure, therefore the basic phase of pressure design of electric capacity and resistance
With.The capacitance of high-voltage arm is generally 400pF at present, and capacitive divider is easily affected by stray capacitance, additionally
The capacitance stability of the impulse capacitor of paper oil insulation is bad, and dielectric loss is bigger.Low-voltage arm electric capacity generally uses collection
Middle electric capacity (thin-film electro perhaps mica capacitor), cable input carries out Impedance matching design.Due to high-low pressure
The medium of arm is different, and its temperature coefficient and voltage coefficient also differ, and the fluctuation of scale factor is relatively big, general
Can guarantee that the accuracy of 3%, the linearity cannot ensure, it is impossible to for measuring transient signal as standard voltage divider.
In view of above-mentioned background, it is desirable to provide a kind of simple in construction, convenient transportation, stable performance, and can eliminate and divide
Couple the capacitive divider of capacitive effect between depressor with equipment or potentiometer, be used for carrying out 1000kV with upper punch
Hit the linearity calibration of potentiometer.
Summary of the invention
In order to solve the above-mentioned deficiency in the presence of prior art, the present invention provides a kind of simple in construction firm, just
In transport, the capacitive divider of the new structure of stable performance, to improve capacitive divider scale factor further
Stability and practicality.
Present invention provide the technical scheme that a kind of capacitive divider, it thes improvement is that: described electric capacity divides
Depressor includes that hollow cylindrical insulation crust, coaxial-symmetrical are located at the metal flange outside described insulation crust two ends
Metal electrode inside dish and two ends；The metal electrode at two ends is connected with the metal flange at two ends respectively, wherein
One end metal flange is provided with concentric grading ring and the damping being connected to high-voltage connection along its axis direction
Resistance is as high-pressure side；Relative to the other end metal flange of high-pressure side as low-pressure end；High-pressure side or low pressure
In the metal electrode of end, low-voltage arm, data acquisition unit and wireless data transmitter, described data acquisition are installed
Unit gathers the voltage at described low-voltage arm two ends, and is sent at external data by described wireless data transmitter
Reason device.
Preferably, described metal electrode is cone, and one end that its cross-sectional area is bigger is detachably connected on institute
State on metal flange medial surface.
Further, the metal electrode of high-pressure side or low-pressure end is bulk metal aluminum electrode, relative to bulk metal aluminum
Less one end of cross-sectional area of the metal electrode of the electrode other end is concentricity to be provided with metallic conductor and is positioned at
Insulant 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.
Further, between described insulation crust and described metal electrode, fill between low-voltage arm and described metal electrode
There is the SF6 gas of 3 atmospheric pressure.
Preferably, described low-voltage arm and described data acquisition unit and wireless data transmitter are separately fixed at
It is perpendicular to the both sides of the gripper shoe of described insulation crust axis.
Further, described metal flange is arranged on described insulation crust two ends, described metal by fastening screw
Air seal circle it is also equipped with between ring flange and described insulation crust.
Further, metal flange is fixed with the gas for monitoring the internal SF6 gas atmosphere of described insulation crust
Pressing table and for ventilation or the intake valve of make-up gas, described intake valve is connected with gas cylinder.
Preferably, the metal flange ground connection of described low-pressure end, described high-voltage connection is metal guide rod.
Compared with immediate technical scheme, the present invention has a following marked improvement:
(1) compared to traditional capacitance-resistance capacitive divider, the present invention provide capacitive divider simple in construction,
Stable performance, each component activity connects, and installation and transportation are convenient.
(2) data acquisition unit is built-in, uses wireless signal transmitter to transmit data, without measuring cable, no
Need to carry out impedance matching, eliminate signal refraction and the problem of reflection.
(3) capacitive divider is symmetrical structure, and grading ring may be installed capacitive divider any one end up and down
On metal flange, and the metal flange being mounted with grading ring is connected with high-voltage connection by damping resistance,
Using the high-pressure side as capacitive divider, the other end makes electricity as the low-pressure end of capacitive divider, this structure
The high-pressure side and the low-pressure end that hold potentiometer can arbitrarily exchange, easy to use.
(4) metal electrode is conical design, and one end that its cross-sectional area is bigger is fixed on metal flange
Inner side, can the upper and lower Potential distribution of uniform insulation shell.Need not design the flange of homogeneous potential distribution.
(5) metal electrode is conical design, and the edge of the less one end of its cross-sectional area is in protruding laterally
Annular, can uniform electric field, improve capacitive divider stability.
(6) insulation crust one end that wherein metal electrode cross-sectional area in one end is less is concentricity is provided with metal
Conductor and the insulant ring between metallic conductor and metal electrode so that high voltage arm capacitor is placed in screen
Cover between electric capacity, do not affected by extraneous stray capacitance, improve the stability of capacitive divider.
(7) between insulation crust and metal electrode, 3 atmospheric pressure between low-voltage arm and metal electrode, it are filled with
SF6 gas so that during just pressure arm is placed in identical medium, voltage coefficient is identical with temperature coefficient, scale because of
The change of number is little.
(8) high-voltage connection uses metal guide rod, and stray inductance is low, and damping resistance 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 present invention；
The capacitive divider electronic schematic diagram that Fig. 3 provides for the present invention；
Wherein: 1-grading ring I, 2-ring flange I, 3-insulation crust, 4-metal electrode I, in 5-
Heart conductor, 6-insulant ring, 7 low-voltage arm, 8 metal electrodes II, 9 data acquisition units and wireless
Signal projector, 10-grading ring II, 11-ring flange II, 12-damping resistance, 13 high-voltage connections, 14
Air gauge, 15 intake valves, C0-mask capacitor, C1-high voltage arm capacitor, C2Low-voltage arm electric capacity.
Detailed description of the invention
In order to be more fully understood that the present invention, below in conjunction with Figure of description and example, present disclosure is done into one
The explanation of step:
As in figure 2 it is shown, the generally cylindrical symmetry of capacitive divider that the present invention provides, 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, air gauge and charge valve etc. form.
Wherein insulation crust is the cylinder blanket that epoxy material makes, and its size is according to the rated voltage of potentiometer
Meter.
Metal flange is coaxially mounted to insulation crust two ends, for fixed metal electrode, damping resistance and all presses
Ring.Metal flange is flexibly connected with insulation crust by fastening screw, easy installation and removal, in order to ensure absolutely
The air-tightness of edge shell, is also equipped with air seal circle between metal flange and insulation crust.
Grading ring is concentricity to be fixed on the metal flange of any one end of insulation crust, is fixed with all in potentiometer
One end of pressure ring is the high-pressure side of potentiometer, and the other end is low-pressure end, and this makes the high-pressure side of potentiometer and low
Pressure side is interchangeable, easy to use；Grading ring is used for uniform potentiometer high-pressure side electric field, weakens corona, grading ring
Diameter determine according to the rated voltage of potentiometer.
Damping resistance is vertically fixed in the middle part of the metal flange of potentiometer high-pressure side, and is connected with high-voltage connection；Resistance
The vibration that buffer resistance causes because of the stray inductance of high-pressure conduit for damping, high-voltage connection uses metal guide rod, miscellaneous
Dissipating inductance low, damping resistance is little.
Air gauge and charge valve are arranged on metal flange.Air gauge is for the gas of the internal SF6 gas of monitoring device
Pressure；Charge valve is connected with gas cylinder, for ventilation or make-up gas.
Metal electrode is conical design, and one end that its cross-sectional area is bigger is detachably connected on metal flange
On medial surface, can uniform insulation shell along the Potential distribution in face, the angle of metal electrode and insulation crust is according to dividing
Depressor rated voltage, the factor such as high voltage arm capacitor amount, Electric Field Distribution is calculated.
Metal electrode I is bulk metal aluminum, the built-in center conductor of top middle portion of metal electrode II, center conductor
And with insulant ring (such as nylon ring) isolation between metal electrode II.For increasing radius of curvature, uniformly electricity
, the edge of the less one end of metal electrode cross-sectional area is processed into circular.Between insulation crust and electrode,
The SF6 gas of 3 atmospheric pressure it is filled with between low-voltage arm and electrode 2.
The inside of metal electrode II is provided with gripper shoe, is used for fixing low-voltage arm, data acquisition unit and wireless signal
Emitter；Low-voltage arm, data acquisition unit and wireless signal transmitter can also be arranged in metal electrode I.
Electronic schematic diagram that in Fig. 1, capacitive divider is formed is as in figure 2 it is shown, metal electrode I and metal
High voltage arm capacitor C will be formed between the center conductor of electrode II1, will between metal electrode I and metal electrode II
Form mask capacitor C0, it is ensured that high voltage arm capacitor C1The stability of capacitance.Metal electrode I and center conductor
Between electric field approaches uniformity electric field.When there are other electrical bodies in the external world, potentiometer and other charged objects
Coupling electric capacity only changes mask capacitor C0Capacitance.
It is internal that data acquisition unit and wireless signal transmitter are placed in metal electrode II, in use, and low-pressure end
Metal electrode ground connection, high-voltage connection connects impulse voltage generator and capacitive divider, data acquisition unit collection
Voltage on low-voltage arm electric capacity C2, and by wireless signal transmitter by voltage signal transmission to PC, by
PC carries out data calculating and analysis, is not required to carry out impedance matching.
Capacitive divider provided by the present invention designs as follows:
S1, according to rated voltage V of potentiometereEdge flashing voltage V with insulation crustsDetermine insulation crust
Height H:H=Ve×V；
S2, determines distance d between two metal electrodes according to the breakdown voltage marginal value of SF6 gas1；SF6
The breakdown voltage of gas determines the distance between two metal electrodes and have to be larger than a certain marginal value, d1Take this to face
Dividing value；
S3, according to distance d between two metal electrodes1, high voltage arm capacitor amount C1, SF6 Gases dielectric constant
εrWith permittivity of vacuum ε0, determine the area S of center conductor:
S4, according to mask capacitor C0Calculate the area S of the less one end of metal electrode I cross section1:
S5, according to high voltage arm capacitor C1Potentiometer low-voltage arm electric capacity C is determined with potentiometer scale factor K2:
C2=C1×K；
S6, according to distance d between height H and two metal electrodes of insulation crust1Determine metal electrode
Highly h:
S7, determines the diameter D of insulation crust according to reserved nargin；
S8, according to insulation crust diameter D, the diameter d of the less one end of metal electrode cross section and metal electrode
Height h determine the angle theta between metal electrode and insulation crust:
These are only embodiments of the invention, be not limited to the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement etc. done, the right of the present invention all awaited the reply in application
Within claimed range.
Claims (9)
1. a capacitive divider, it is characterised in that: described capacitive divider includes outside hollow cylindrical insulation
Shell, coaxial-symmetrical are 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, during wherein one end metal flange is provided with together
The grading ring of the heart and along the damping resistance being connected to high-voltage connection of its axis direction as high-pressure side；Relative to high pressure
The other end metal flange of end is as low-pressure end；In the metal electrode of high-pressure side or low-pressure end, low pressure is installed
Arm, data acquisition unit and wireless data transmitter, described data acquisition unit gathers described low-voltage arm two ends
Voltage, and it is sent to external data processor by described wireless data transmitter.
2. a kind of capacitive divider as claimed in claim 1, it is characterised in that:
Described metal electrode is cone, and one end that its cross-sectional area is bigger is detachably connected on described metal method
On blue dish medial surface.
3. a kind of capacitive divider as claimed in claim 2, it is characterised in that:
The metal electrode of high-pressure side or low-pressure end is bulk metal aluminum electrode, relative to bulk metal aluminum electrode another
Less one end of cross-sectional area of the metal electrode of end is concentricity to be provided with metallic conductor and is positioned at described metal
Insulant ring between conductor and metal electrode.
4. a kind of capacitive divider as claimed in claim 3, it is characterised 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 3, it is characterised in that:
3 it are filled with greatly between described insulation crust and described metal electrode, between low-voltage arm and described metal electrode
The SF6 gas of air pressure.
6. a kind of capacitive divider as claimed in claim 1, it is characterised in that:
Described low-voltage arm and described data acquisition unit and wireless data transmitter are separately fixed at and are perpendicular to institute
State the both sides of the gripper shoe of insulation crust axis.
7. a kind of capacitive divider as claimed in claim 5, it is characterised in that:
Described metal flange is arranged on described insulation crust two ends by fastening screw, described metal flange with
Air seal circle it is also equipped with between described insulation crust.
8. a kind of capacitive divider as claimed in claim 5, it is characterised in that:
Be fixed with on metal flange the air gauge for monitoring the internal SF6 gas atmosphere of described insulation crust and
For ventilation or the intake valve of make-up gas, described intake valve is connected with gas cylinder.
9. a kind of capacitive divider as claimed in claim 1, it is characterised in that:
The metal flange ground connection of described low-pressure end, described high-voltage connection is metal guide rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510303516.8A CN106291035B (en) | 2015-06-04 | 2015-06-04 | Capacitive voltage divider |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510303516.8A CN106291035B (en) | 2015-06-04 | 2015-06-04 | Capacitive voltage divider |
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| Publication Number | Publication Date |
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| CN106291035A true CN106291035A (en) | 2017-01-04 |
| CN106291035B CN106291035B (en) | 2023-09-22 |
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Cited By (3)
| 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 |
| CN107121583A (en) * | 2017-06-30 | 2017-09-01 | 中国西电电气股份有限公司 | A kind of noninductive resistance unit |
| CN109324305A (en) * | 2018-11-19 | 2019-02-12 | 中国电力科学研究院有限公司 | Impulse voltage divider linearity calibration capacitor bleeder mechanism |
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| US3835353A (en) * | 1972-03-29 | 1974-09-10 | Siemens Ag | Capacitive voltage-dividing arrangement for high voltage measuring apparatus |
| CN2574061Y (en) * | 2002-06-30 | 2003-09-17 | 武汉高压研究所 | High voltage capacitance divider |
| CN102128964A (en) * | 2011-01-14 | 2011-07-20 | 西北核技术研究所 | Capacitive voltage divider used for measuring radiation diode parameters and installation method |
| CN202362345U (en) * | 2011-12-07 | 2012-08-01 | 重庆市电力公司电力科学研究院 | Standard capacitance divider and induced voltage measurement device |
| CN204228795U (en) * | 2014-11-20 | 2015-03-25 | 国家电网公司 | A kind of compact broadband capacitive divider measured for square-wave voltage |
-
2015
- 2015-06-04 CN CN201510303516.8A patent/CN106291035B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3835353A (en) * | 1972-03-29 | 1974-09-10 | Siemens Ag | Capacitive voltage-dividing arrangement for high voltage measuring apparatus |
| CN2574061Y (en) * | 2002-06-30 | 2003-09-17 | 武汉高压研究所 | High voltage capacitance divider |
| CN102128964A (en) * | 2011-01-14 | 2011-07-20 | 西北核技术研究所 | Capacitive voltage divider used for measuring radiation diode parameters and installation method |
| CN202362345U (en) * | 2011-12-07 | 2012-08-01 | 重庆市电力公司电力科学研究院 | Standard capacitance divider and induced voltage measurement device |
| CN204228795U (en) * | 2014-11-20 | 2015-03-25 | 国家电网公司 | A kind of compact broadband capacitive divider measured for square-wave voltage |
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 |
| 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 |
| CN107121583A (en) * | 2017-06-30 | 2017-09-01 | 中国西电电气股份有限公司 | A kind of noninductive resistance unit |
| CN109324305A (en) * | 2018-11-19 | 2019-02-12 | 中国电力科学研究院有限公司 | Impulse voltage divider linearity calibration capacitor bleeder mechanism |
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| CN106291035B (en) | 2023-09-22 |
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