CN206057548U - Annular capacitor potentiometer is used in a kind of impulse voltage divider linearity calibration - Google Patents
Annular capacitor potentiometer is used in a kind of impulse voltage divider linearity calibration Download PDFInfo
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- CN206057548U CN206057548U CN201620653974.4U CN201620653974U CN206057548U CN 206057548 U CN206057548 U CN 206057548U CN 201620653974 U CN201620653974 U CN 201620653974U CN 206057548 U CN206057548 U CN 206057548U
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- voltage divider
- linearity calibration
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- 239000003990 capacitor Substances 0.000 title claims abstract description 29
- 239000002184 metal Substances 0.000 claims abstract description 37
- 229910052751 metal Inorganic materials 0.000 claims abstract description 37
- 238000005259 measurement Methods 0.000 claims abstract description 29
- 238000013016 damping Methods 0.000 claims abstract description 14
- 238000009413 insulation Methods 0.000 claims abstract description 9
- 239000013307 optical fiber Substances 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 9
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- 230000005684 electric field Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
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- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
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Abstract
Annular capacitor potentiometer is used in a kind of impulse voltage divider linearity calibration, including high pressure guide rod, damping resistance, metal flange, low-voltage arm, measurement cable, attenuator, data acquisition unit and converting unit, optical fiber interface, it is characterized in that, it is anterior that damping resistance is placed in potentiometer metal shell, it is connected with metal flange with the threaded rod side side that is connected with high pressure guide rod, metal shell is insulated with metal flange by insulation support plate.
Description
Technical field
This utility model is related to a kind of power measurement field, more specifically carries out school to impacting voltage measuring apparatus
Accurate, detection field, more particularly to a kind of capacitive divider dedicated for measuring the impulse voltage divider linearity.
Background technology
Critical technical parameter of the linearity as gauge resistor potentiometer, passes in the research of surge voltage magnitude tracing and value
Pass middle as a uncertainty composition component that can not be ignored, be characterized as the change of applied voltage, the change of voltage divider ratio
Change.Either surge voltage magnitude tracing research, or the type approval test of potentiometer, delivery test, routine test and cycle
In calibration, linearity measure is all necessary measure the item.
As the rated voltage of measuring resistance potentiometer is generally less than 1000kV, therefore the calibration point of surge voltage measurement apparatus
The voltage of pressure ratio (measurement error) in 1000kV, and potentiometer higher than 1000kV part, it is necessary to by additive method survey
The amount linearity, and the partial uncertainty that its measurement result is introduced into is blended in final uncertainty of measurement, this clause exists
Clearly proposed in the IEC60060-2 of new edition in 2010.For impulse voltage divider linearity measure, general provision, for accreditation
Potentiometer, its linearity need to be within 1%, and IEC standard only gives the suggestion of directiveness, such as adopts ball gap, electric field measurement
Instrument is measured, and is measured using impulse voltage generator and is analyzed which for the capacitive divider comprising more piece high-voltage arm carries out merogenesis
Performance.
Measured using ball gap.Tabled look-up by standard and understood as a diameter of 2m of ball, distance is 1m, its 50% discharge voltage
For 1930kV, certainty of measurement is 3%, theoretically feasible.But voltage is higher, the manufacture difficulty increase of ball gap, it is not easy to real
It is existing；And the linearity is measured by ball gap, the impact of ambient temperature and humidity is very big.
Electric-field sensor is measured.During generation corona, the concordance of electric field waveform and voltage waveform is good, once but there is electricity
Dizzy, electric field distortion is serious, and measured value has very big deviation with value of calculation.The linear of potentiometer is measured in 1000kV-3000kV
When spending, corona will be inevitably produced, therefore the method can only carry out auxiliary checking.
Impulse voltage generator is measured.Various countries obtain the linearity of potentiometer substantially using the method during building mark.Profit
Tested potentiometer system linearity degree is checked with the charging voltage of impulse voltage generator.The charging bar of surge generator during test
Part should keep stable, under 5 amplitudes of the impact test voltage of regulation, the output voltage of calculating partial pressure device system with accordingly fill
The ratio of piezoelectric voltage.Japanese expert Harada carries out the experimental study of the linearity, using known when measuring resistance potentiometer is developed
The 700kV potentiometer of the linearity and impulse voltage generator obtain the linearity [3-4] of 500kV standard voltage dividers, here basis
On, linearity highest measurement to 1200kV.Verification experimental verification, method one are carried out then using theory hypothesis in experiment：Will test
The generator for obtaining is assumed to be the linearity of potentiometer with the common linearity of potentiometer, and it is non-that the method is only adapted to measurement result
In the case of often good；Method two：Generator and the common linearity of potentiometer are obtained using test method, then using PTB schools
The accurate potentiometer linearity obtains the linearity of generator, and now both subtract each other the linearity that can obtain measuring potentiometer.But this
When there is also problem, using identical series, charging voltage increase, it is necessary to assume the electric capacity charging voltage linearity；Per grade of electricity that charges
Pressure is consistent, and series increases, it is necessary to assume that different series charging voltages do not have inhomogeneities, and both hypothesis all do not have reliable
Theoretical foundation.
Merogenesis is measured.When potentiometer is made up of more piece same unit, can merogenesis measure its performance, measure from low to high
The capacitance of high-voltage arm under different voltages, then calculates its intrinsic standoff ratio, but the check of the potentiometer to assembling should not receive corona
And other impacts under the upper voltage limit for demarcating measurement range.But in actual experiment, the generation of corona be it is unavoidable, and
And the influence amount of the influence factor such as stray parameter will change after assembling.
It can be seen that, all there is certain limitation in the voltage for several megavolts, aforementioned several method.
It is therefore desirable to propose be suitable for the extreme high voltage impulse voltage divider linearity calibration system composition, critical material and
Calibration steps.
Utility model content
Based on the problem that prior art is present, the utility model proposes a kind of capacitive divider of new structure, which is just
In installation, small volume, the linearity for more than 1000kV impulse voltage dividers is calibrated, i.e., a kind of impulse voltage divider linearity calibration
Use annular capacitor potentiometer.
More specifically, the utility model proposes a kind of impulse voltage divider linearity calibration use annular capacitor potentiometer, bag
Include high pressure guide rod, damping resistance, metal flange, low-voltage arm, measurement cable, attenuator, data acquisition unit and converting unit, light
Fine interface, it is characterised in that it is anterior that damping resistance is placed in potentiometer metal shell, is connected one with threaded rod side with high pressure guide rod
Side is connected with metal flange, and metal shell is insulated with metal flange by insulation support plate.
The potentiometer includes high pressure guide rod, damping resistance, metal flange, low-voltage arm, measurement cable, attenuator, data
Collecting unit and converting unit, optical fiber interface.Further, also including insulation support plate, metal shell, optical fiber.
Preferably, to be placed in potentiometer metal shell anterior for damping resistance, is connected with high pressure guide rod side with threaded rod side
It is connected with metal flange.
Preferably, metal shell is insulated with metal flange by insulation support plate.
Preferably, low-voltage arm includes connecting screw rod, insulating lid, top panel, build-out resistor, annular capacitance body in parallel, below
Plate, low-voltage arm metal shell, cable connector.
Preferably, annular capacitance body in parallel is formed in parallel by multiple lumped capacitances, and a terminated high voltage guide rod, one end connection are low
Pressure arm metal shell.
Preferably, build-out resistor and measurement cable series connection.
Preferably, attenuator is placed between sampling capacitor and data acquisition and converting unit, to the voltage on sampling capacitor
Signal carries out second divided voltage.
Preferably, the parallel connection annular capacitance body of potentiometer is sampling capacitor, and shell is low tension to the stray capacitance of the earth
Hold, data acquisition unit is placed in bucket, the voltage signal on direct measurement sampling capacitor.
Preferably, sampling capacitor and collecting unit is closer to the distance, but remains a need for being matched, and build-out resistor is used to match
The natural impedance of measurement cable.
Preferably, sampling voltage is reduced by the attenuator of good transient response.
Annular capacitor potentiometer is used based on the calibration of the extra-high voltage impulse voltage divider linearity as above, it is characterised in that body
Product is little, easy for installation, is readily transported, the advantages of strong antijamming capability.
Description of the drawings
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or accompanying drawing to be used is briefly described needed for description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, in the premise for not paying creative work
Under, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is according to a kind of capacitive divider wiring diagram of the present utility model；
Fig. 2 is according to a kind of capacitive divider internal structure schematic diagram of the present utility model；
Fig. 3 is according to a kind of capacitive divider principle schematic of the present utility model.
Wherein, in the accompanying drawings：1-high pressure guide rod, 2-damping resistance, 3-metal shell, 4-metal flange, 5- insulation
Gripper shoe, 6- stray capacitances, 7- voltage dividers, 8-connecting screw rod, 9-insulating lid, 10-annular capacitance body in parallel,
11-low-voltage arm, 12,13-connecting screw rod, 14-top panel, 15,16-electric capacity, 17-build-out resistor, 18-version below, 19,
23-cable interface, 20-dead ring, 21-measurement cable, 22-attenuator shell, 24-attenuator high-tension resistive, 25-decline
Subtract device low resistance, 26-Data collecting conversion unit, 27-optical fiber interface, 28-optical fiber, 29-high pressure guide rod, 30-damping
Resistance, 31-metal flange, 32-insulation support plate, 33-metal shell.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only this utility model a part of embodiment, rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of this utility model protection.
Many details are elaborated in the following description in order to fully understand this utility model, but this practicality is new
Type can also be different from alternate manner described here to implement using other, and those skilled in the art can be without prejudice to this reality
With doing similar popularization in the case of new intension, therefore this utility model is not limited by following public specific embodiment.
Secondly, this utility model is described in detail with reference to schematic diagram, when this utility model embodiment is described in detail, for ease of
Illustrate, represent that the profile of apparatus structure can be disobeyed general ratio and be made partial enlargement, and the schematic diagram is example, its
This should not limit the scope of this utility model protection.Additionally, the three-dimensional space of length, width and height should be included in actual fabrication
Between size.
Below in conjunction with the accompanying drawings specific embodiment of the present utility model is described in further detail.
Impulse voltage divider linearity calibration annular capacitor potentiometer critical piece include high pressure guide rod 1, damping resistance 2,
Metal flange 4, insulation support plate 5, metal shell 33, low-voltage arm 11, measurement cable 21, attenuator 22-25, data acquisition unit
Converting unit 26, optical fiber interface 27, optical fiber 28.
It is anterior that damping resistance is placed in potentiometer metal shell, is connected with high pressure guide rod side and metal method with threaded rod side
It is blue to be connected；Metal shell is insulated with metal flange by insulation support plate；Low-voltage arm 11 includes connecting screw rod 12-13, insulating lid
9th, top panel 14, build-out resistor 17, annular capacitance body 10 in parallel, lower panel 18, low-voltage arm metal shell, cable connector.
Annular capacitance body in parallel is formed in parallel by multiple lumped capacitances, a terminated high voltage guide rod, one end connection low-voltage arm gold
Category shell.Build-out resistor is used to match measurement cable, with measurement cable series connection.Shunt capacitance body be sampling capacitor, attenuator
It is placed between sampling capacitor and data acquisition and converting unit, second divided voltage is carried out to the voltage signal on sampling capacitor.Also
It is to say, the parallel connection annular capacitance body of potentiometer is sampling capacitor, shell is low-voltage capacitance to the stray capacitance of the earth, data are adopted
Collection unit is placed in bucket, the voltage signal on direct measurement sampling capacitor.
In this embodiment, although sampling capacitor and collecting unit it is closer to the distance, but in order to reach more preferable effect,
Preferably remain a need for being matched, specifically, build-out resistor is used for the natural impedance for matching measurement cable.
In this embodiment, attenuator is needed with good transient response.This is because：Due to data acquisition unit
Measurement voltage is not higher than 10V, and the capacity of lumped capacitance can not be too big, needs the attenuator of good transient response by sampling voltage
Reduce.
Low-voltage capacitance is the stray capacitance of shell and ground.The influence factor of low-voltage capacitance is mainly distance to the ground, environment bar
The factor such as part and corona, therefore to ensure measurement level, need in use to enter professional etiquette to distance to the ground scope, ambient temperature and humidity
It is fixed, and in the short period to completing experiment, preferably to improve measurement level.In the design process, to measuring voltage and shell
Size carries out simulation calculation so as to measure under conditions of corona is not produced.
It should be noted that aforementioned requirement in use, the points for attention for actually using, requirement therein be for
The preferred condition that measurement level is more preferably set, if not with these conditions, and the reality of without prejudice to the technical program
It is existing.
All in all, the potentiometer according to present embodiment, small volume is consequently facilitating transport and installation；Additionally, due to partial pressure
Device internal structure is purely capacitive structure, there is no inductance, and the frequency response of potentiometer is good, only needs stray electrical on damping high-voltage lead
The vibration that appearance causes；And high-voltage connection adopts metal guide rod, stray inductance is low, and damping resistance is little.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use that this practicality is new
Type.Various modifications to these embodiments will be apparent for those skilled in the art, determined herein
The General Principle of justice can be realized in the case of without departing from spirit or scope of the present utility model in other embodiments.Cause
This, this utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The most wide scope consistent with features of novelty.
Claims (7)
1. annular capacitor potentiometer, including high pressure guide rod, damping resistance, metal method are used in a kind of impulse voltage divider linearity calibration
Orchid, low-voltage arm, measurement cable, attenuator, data acquisition unit and converting unit, optical fiber interface, it is characterised in that damping resistance
It is placed in potentiometer metal shell anterior, is connected with metal flange with the threaded rod side side that is connected with high pressure guide rod, metal shell
Insulated with metal flange by insulation support plate.
2. annular capacitor potentiometer is used in impulse voltage divider linearity calibration according to claim 1, it is characterised in that low pressure
Arm includes connecting screw rod, insulating lid, top panel, build-out resistor, annular capacitance body in parallel, lower panel, low-voltage arm metal shell, electricity
Cable joint.
3. annular capacitor potentiometer is used in impulse voltage divider linearity calibration according to claim 2, it is characterised in that in parallel
Annular electro volume is formed in parallel by multiple lumped capacitances, a terminated high voltage guide rod, one end connection low-voltage arm metal shell.
4. annular capacitor potentiometer is used in impulse voltage divider linearity calibration according to claim 2, it is characterised in that matching
Resistance and measurement cable series connection.
5. annular capacitor potentiometer is used in impulse voltage divider linearity calibration according to claim 1, it is characterised in that decay
Device is placed between sampling capacitor and data acquisition and converting unit, carries out second divided voltage to the voltage signal on sampling capacitor.
6. annular capacitor potentiometer is used in impulse voltage divider linearity calibration according to claim 1, it is characterised in that partial pressure
The parallel connection annular capacitance body of device is sampling capacitor, and shell is low-voltage capacitance to the stray capacitance of the earth, and data acquisition unit is placed in
In bucket, the voltage signal on direct measurement sampling capacitor.
7. annular capacitor potentiometer is used in impulse voltage divider linearity calibration according to claim 1, it is characterised in that good
Sampling voltage is reduced by the attenuator of transient response.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620653974.4U CN206057548U (en) | 2016-06-27 | 2016-06-27 | Annular capacitor potentiometer is used in a kind of impulse voltage divider linearity calibration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620653974.4U CN206057548U (en) | 2016-06-27 | 2016-06-27 | Annular capacitor potentiometer is used in a kind of impulse voltage divider linearity calibration |
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| Publication Number | Publication Date |
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| CN206057548U true CN206057548U (en) | 2017-03-29 |
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Cited By (1)
| 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 |
-
2016
- 2016-06-27 CN CN201620653974.4U patent/CN206057548U/en active Active
Cited By (2)
| 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 |
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