CN204359923U - A kind of novel high voltage direct current generator calibration equipment - Google Patents
A kind of novel high voltage direct current generator calibration equipment Download PDFInfo
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- CN204359923U CN204359923U CN201520053732.7U CN201520053732U CN204359923U CN 204359923 U CN204359923 U CN 204359923U CN 201520053732 U CN201520053732 U CN 201520053732U CN 204359923 U CN204359923 U CN 204359923U
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Abstract
The utility model discloses a kind of novel high voltage direct current generator calibration equipment, comprise ripple and measure sampling unit, pull-up resistor unit and voltage standard sampling unit, described ripple is measured sampling unit and is comprised the high-voltage filtering capacitor and resitstance voltage divider group that are in series, pull-up resistor unit comprises the pull-up resistor and sample resistance that are in series, voltage standard sampling unit comprises standard voltage divider, described ripple measures sampling unit, pull-up resistor unit and voltage standard sampling unit are all connected with computing machine by digital voltmeter, the high pressure that high voltage direct current generator sends, sampling unit is measured by ripple, the voltage divider of pull-up resistor unit and voltage standard sampling unit, convert the low pressure that range measured by applicable digital voltmeter to, computing machine is sent to for the corresponding signal of digital voltmeter collection.Calibration equipment automaticity is high, and easy to operate, clear, the checkout procedure of short form test personnel, alleviates labour intensity greatly, improves work efficiency.
Description
Technical field
The utility model relates to a kind of novel high voltage direct current generator calibration equipment.
Background technology
High voltage direct current generator, the Motivation of enterprises departments such as power department, industrial and mineral, metallurgy, iron and steel that are widely used in carry out DC voltage withstand test and direct current leakage current testing to Zinc-Oxide Arrester, power cable, transformer, generator, high-voltage switch equal-height pressure electrical equipment.Electric system, in order to safe operation, is all wanted every year periodically to test power equipment, is confirmed whether it can safe operation.And carry out testing wherein a kind of high-tension testing apparatus, just there is high voltage direct current generator.According to the requirement of the corresponding specification of electric system, high voltage direct current generator (also comprising other associated high voltage testing equipments) all will be delivered to every year to be had qualification and detects department and carry out cycle verification.
Wherein, surely belong to Zinc-Oxide Arrester to the function of high voltage direct current generator and performance requirement high.That is the size of voltage indicating value when working to high voltage direct current generator and the accuracy of electric current indicating value, AC ripple and capacity has corresponding requirement.
Zinc-Oxide Arrester is mounted in transformer station's high-tension line end of incoming cables, and its effect is struck by lightning when working line, or when working line produces internal overvoltage for a certain reason, protection power equipment is without prejudice.
Zinc-Oxide Arrester inside is made up of zinc oxide valve plate; it has good nonlinear characteristic, and the Zinc-Oxide Arrester residual voltage manufactured with it is low, discharge capacity is large, the response time is fast, without power frequency continued flow, without series gap, the dielectric level that can reduce protected equipment.So applied widely in electric system, the security greatly increasing electric system creates huge economic benefit.But find through on-the-spot operation, bear the effect of the factors such as power-frequency voltage, surge voltage and internal wetted due to Zinc-Oxide Arrester for a long time and be tending towards aging, its insulation characterisitic is destroyed.Show as leakage current increase and cause thermal runaway, Zinc-Oxide Arrester time serious, will be caused to be damaged or to explode, and then cause large-area power-cuts.Therefore, cycle detection must be carried out to the leakage current of Zinc-Oxide Arrester, ensure its safe operation.
Lightning arrester dispatches from the factory, install at the end of, or run after a period of time, according to the regulation of " Erection works of electrical installations Standard for handover test of electric equipment " and " power equipment preventive trial code ", reply lightning arrester carries out critical operation voltage U during direct current 1mA
1mAand 0.75U
1mAleakage Current test under DC voltage.
Carry out test objective:
1, critical operation voltage U during direct current 1mA is measured
1mAobject checks whether its inside makes moist;
2,0.75U is measured
1mAleakage Current object under DC voltage is whether it allows working current to conform with the regulations for a long time.The equipment carrying out above-mentioned test is high voltage direct current generator.
When testing staff verifies high voltage direct current generator, the policy paper of foundation is DL-T848.1-2004 " high-pressure test device general technical specifications Part I high voltage direct current generator ".Standard regulation is for by school high voltage direct current generator fundamental test, must by the ripple be defined under different voltage, electric current, different voltage, and rated voltage, electric current capacity verify, that is testing crew needs repeatable operation high voltage direct current generator increasing apparatus, provide multiple test point and measure for calibration equipment.Testing crew is in checking procedure simultaneously, and the checkpoint requirement that must specify by standard is measured one by one, records measurement data simultaneously, and form raw readings, the error of calculation, provides calibration certificate.Whole verification process is loaded down with trivial details, inefficiency, is not suitable with the development of electric system.
In existing calibration equipment, another problem is that the voltage that testing equipment exports will raise, and the high-voltage bleeder rated voltage of corresponding sampling also will reach requirement along with voltage class of electric power system improves.Consider from technical standpoint, high-voltage bleeder withstand voltage improves, and during manufacture, the voltage coefficient of its intrinsic standoff ratio is difficult to the requirement meeting verification.If met the requirements, will take many hardware compensating measures, the volume of voltage divider, weight certainly will be made like this to increase, and the corresponding raising of cost is many, and cost performance reduces.(note: intrinsic standoff ratio refers to the ratio of high voltage and low-voltage; Voltage coefficient refers under different voltage, the degree that intrinsic standoff ratio is consistent).
Along with the development of society, society is increasing to electrical demand, and electric system is corresponding will build more multi-Substation, increases a large amount of power equipments.The increase of power equipment, also impels the owning amount of high voltage direct current generator to increase.The annual week inspection of a large amount of high voltage direct current generators all will deliver to detection department, testing staff's workload is increased, can't bear to bear a heavy burden.Therefore testing staff is in the urgent need to quick, accurate, to improve detection efficiency intelligentized verifying attachment.
Utility model content
For solving the deficiency that prior art exists, the utility model discloses a kind of novel high voltage direct current generator calibration equipment, this calibration equipment have employed microcomputer and controls, with Interface of Virtual Instruments, measured setting parameter, verification are carried out in man-machine conversation, both ensure that verification long time stability, there is again the Novel calibration device of intelligent feature.
For achieving the above object, concrete scheme of the present utility model is as follows:
A kind of novel high voltage direct current generator calibration equipment, comprise ripple and measure sampling unit, pull-up resistor unit and voltage standard sampling unit, described ripple is measured sampling unit and is comprised the high-voltage filtering capacitor and resitstance voltage divider that are in series, pull-up resistor unit comprises the pull-up resistor and sample resistance that are in series, voltage standard sampling unit comprises standard voltage divider, described ripple measures sampling unit, pull-up resistor unit and voltage standard sampling unit are all connected with computing machine by digital voltmeter, the high pressure that high voltage direct current generator sends measures sampling unit by ripple, the voltage divider of pull-up resistor unit and voltage standard sampling unit converts the low pressure that range measured by applicable digital voltmeter to, computing machine is sent to for the corresponding signal of digital voltmeter collection.
Described ripple is measured sampling unit, pull-up resistor unit and voltage standard sampling unit and is powered by high-voltage power supply.
Described computing machine is connected with digital voltmeter by USB line.
Principle of work: during verification high voltage direct current generator, according to relevant regulatory requirements by 0 ~ U
n(rated voltage), or 0 ~ I
nrated current divides equally several measurement points, such as ten measurement points.During inspection by manual operation high voltage direct current generator progressively levitation voltage (for DC voltage) to ratings, then artificial on form printed in advance pointwise record measurement data, the error of calculation, write examining report.
When the application verifies high voltage direct current generator, the precondition without the need to repeatable operation is that high voltage direct current generator self has automatic boosting function, and will have peripheral control interface, and open communications protocol.Putting before this, the computing machine in calibration equipment just can control high voltage direct current generator automatic boosting under setting program, also just boosts without the need to artificial repeatable operation.
Certainly, there is no the high voltage direct current generator of automatic boosting function, manually can only boost, more automatically record measurement data, the error of calculation, write examining report.Above-mentioned two series products have manufacturer production at present.
Calibration equipment measuring principle is under high voltage direct current generator rises high-pressure situations, based on voltage, electric current, pulsating volage (ripple) analog quantity that ripple voltage divider, pull-up resistor sampling end and standard voltage divider provide, under the operation of Interface of Computer controls, 3 digital voltmeter input ends will be delivered to respectively, the analog quantity that digital voltmeter will be adopted, converts digital quantity to by the A/D in table.Digital quantity, with stream socket, is exported by the serial ports of digital voltmeter, uploads in PC.PC is by digital quantity by corresponding interface control, and data processing software, error calculation software, report forms software, completes measurements, the raw readings detected, certificate or reporting obligations process, preservation, output printing.
The beneficial effects of the utility model:
High voltage direct current generator is a kind of important tests equipment that can examination power equipment normally run, the whether accurate safe operation directly affecting power equipment of its value.Can high voltage direct current generator calibration equipment, be used to examination high voltage direct current generator voltage, magnitude of current limit shelves error, meet its accuracy requirement, and the measurement instrument that can ripple, amount of capacity require.This calibration equipment have employed microcomputer and controls, and with Interface of Virtual Instruments, measured setting parameter, verification are carried out in man-machine conversation, both ensure that verification long time stability, have again the Novel calibration device of intelligent feature.
Its advantage is summed up as:
1) microcomputer controls, and with Interface of Virtual Instruments, the setting about checking parameter is carried out in man-machine conversation, and automatically measures.
2) this calibration equipment realizes seamless link by Labview platform to 3 multimeters, can upload to upper computer software system at any time to its data collected.
3) extremely convenient voltage coefficient and the error revising high-voltage bleeder sampling unit of calibration equipment.Reduce the technical difficulty of manufacture, decrease volume and weight, improve cost performance.
4) calibration equipment automaticity is high, and easy to operate, clear, the checkout procedure of short form test personnel, alleviates labour intensity greatly, improves work efficiency.
Accompanying drawing explanation
Fig. 1 circuit diagram of the present utility model.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is described in detail:
As shown in Figure 1, in figure, the left side the 1st row are tested high voltage direct current generators, and voltage is raised to different checkpoints according to code requirement by it, measures for checkout equipment.
1) ripple is measured
In figure, left side secondary series is that ripple measures sampling unit, and it is made up of high-voltage filtering capacitor and resitstance voltage divider.Leached by flutter component in high direct voltage by filter capacitor during work, deliver to resitstance voltage divider end, resitstance voltage divider is by pulsating volage U
1drop to U
2reach in the range ability of digital voltmeter.Its calculating formula is:
Ripple component=U
1/ U × 100%
Wherein: U
1=U
2× k
1, k
1intrinsic standoff ratio U-high direct voltage the value of-resitstance voltage divider
2) capacity
In figure, the left side the 3rd row are pull-up resistor unit, by pull-up resistor to load on high voltage direct current generator band, and by pull-up resistor R
1the current value I obtained, by measuring resistance R
1convert the voltage proportional with current value to, obtain U by second piece of digital voltmeter
3with the reference voltage U that the 3rd piece of digital voltmeter obtains
refbe multiplied, calculated capacity
Its calculating formula is: P=U
3× U
ref=I × R
1× U
ref
Wherein: P-high voltage direct current generator capacity R
1-have fixing value than row coefficient
3) electric current indicating value
Electric current indicating value refers to that high voltage direct current generator is when levitation voltage, and needing provides electric current to load, thus the current instruction value that reometer produces on high voltage direct current generator.
Electric current indicating value measurement data acquisition: when high voltage direct current generator is raised to a magnitude of voltage, corresponding high voltage direct current generator reometer has current instruction value, simultaneously in the drawings the left side the 3rd row pull-up resistor also flows through identical electric current.This electric current is by measuring resistance R
1convert the voltage proportional with current value to, obtained by second piece of digital voltmeter.
In figure, left side secondary series ripple is measured sampling unit high-end is filter capacitor, does not have direct current channel.In figure, the left side the 4th row are standard voltage dividers, and the electric current that it is eaten has been revised in Error processing software.
In reality verification, computer virtual interface is composed of a form, following example:
| Indicating value (mA) | Standard value (measured value) mA | Error (%) |
| 1 | 1.0045 | -0.45 |
| 2 | 2.0078 | -0.39 |
| 3 | 3.0095 | -0.32 |
| 4 | 4.0123 | -0.31 |
| 5 | 5.0152 | -0.30 |
Set up the voltage of high voltage direct current generator, make reometer be designated as 1mA, click interface OK button, measured value enters the first row automatically, secondary series, as 1.0045mA.2 ~ 5mA by that analogy.
Certain high voltage direct current generator reometer indicated value and measured value (value that second piece of digital voltmeter obtains) have error, and this is the work will done in follow-up Error processing software.
High voltage direct current generator electric current indicating value I
xerror is calculated by following formula:
The electric current error of indication=(I
x– I)/I × 100%
I
x: high voltage direct current generator reometer indicated value
I: high voltage direct current generator current measurement value, that is the value that second piece of digital voltmeter obtains
4) voltage indicating value
Voltage indicating value refers to that high voltage direct current generator is when levitation voltage, the indicated value of voltage table on it.
Voltage indicating value measurement data acquisition: when high voltage direct current generator is raised to a magnitude of voltage, simultaneously in the drawings the left side the 4th row standard voltage divider is also added with voltage.This voltage, by standard voltage divider dividing potential drop, converts the voltage of applicable voltage table range ability to, is obtained by the 3rd piece of digital voltmeter.The voltage value U that it obtains
refthe value error of calculating voltage, electric current, and ripple, capacity the size criteria factor.
In reality verification, computer virtual interface is composed of a form, following example:
| Indicating value (kV) | Standard value (measured value) kV | Error (%) |
| 50 | 50.23 | -0.46 |
| 100 | 100.41 | -0.41 |
| 150 | 150.62 | -0.41 |
| 200 | 200.85 | -0.42 |
| 250 | 250.91 | -0.36 |
Set up the voltage of high voltage direct current generator, make voltage table be designated as 50kV, click interface OK button, measured value enters the first row automatically, secondary series, as 50.23kV.100 ~ 250kV by that analogy.
Certain high voltage direct current generator voltage table indicated value and measured value (the 3rd piece of value that digital voltmeter obtains) have error, and this is the work will done in follow-up Error processing software.
It calculates high voltage direct current generator voltage indicating value U
xerror is by following formula
The voltage error of indication=(U
x– U
ref)/U
ref× 100%
U
x: high voltage direct current generator reometer indicated value
U
ref: high voltage direct current generator voltage measuring value, that is the 3rd piece of value that digital voltmeter obtains.
Calibration equipment adopts Microcomputer Management, and system is based on windows xp operating system, and software adopts virtual instrument labview8.5 version.Labview (Laboratory Virtual instrument Engineering) is a kind of patterned programming language, the data acquisition of standard and instrument control software, can set up the virtual instrument of oneself easily, its patterned interface makes programming and use procedure all vivid and interestings.Calibration equipment is controlled by the operation of Interface of Computer, achieve measurement data acquisition, transmission, storage, process and automatically to measuring, calibration, calibrating, the record detected, certificate or reporting obligations process, preservation, output, improve work efficiency.
Extremely convenient voltage coefficient and the error revising high-voltage bleeder sampling unit of calibration equipment: intrinsic standoff ratio refers to the ratio of high voltage and low-voltage, and it is a constant, i.e. k=U1/U2 (k is intrinsic standoff ratio)
Voltage coefficient refers under different voltage, the degree that intrinsic standoff ratio is consistent, and its dimensionless, weighs by error.
Resitstance voltage divider is made up of resistor, and the voltage coefficient of resistor is caused by manufacturing process, and when applying different operating voltage, its resistance value can change.The change of resistance value also just affects the voltage coefficient of resitstance voltage divider.Therefore, after resitstance voltage divider manufactures, its voltage coefficient just determines, and cannot change from hardware point of view.
In practical operation, before verification high voltage direct current generator, resitstance voltage divider intrinsic standoff ratio error is first demarcated from low to high, according to the relation determination modified value of the error of each voltage calibration point intrinsic standoff ratio and the standard scores pressure ratio (routine k=1000) of setting under different voltage.Then according to modified value software mode correction, the correction of voltage coefficient is reached.
Concrete grammar: click the optimum configurations hurdle in inspection software, DC voltage, DC current and alternating voltage (ripple) three coefficient modifying tables will be shown.And corresponding three 6 1/2 digital multimeter of these three coefficient modifying tables, what measure respectively is DC voltage, DC current (current/voltage conversion) and alternating voltage (ripple).Then according to surveyed intrinsic standoff ratio error, easily revise.At this moment by coefficient correction, compensating error, makes measured value more accurate.
Calibration equipment measuring principle is the voltage, electric current, pulsating volage (ripple) analog quantity that provide based on ripple voltage divider, pull-up resistor and standard voltage divider, under the operation of Interface of Computer controls, 3 digital voltmeter input ends will be delivered to respectively, the analog quantity that digital voltmeter will be adopted, converts digital quantity to by the A/D in table.Digital quantity, with stream socket, is exported by the serial ports of digital voltmeter, uploads in PC.PC is by digital quantity by corresponding interface control data processing software, error calculation software, and report forms software, completes measurements, the raw readings detected, certificate or reporting obligations process, preservation, output printing.
1) main interface is for inputting following information
A) relevant information of test specimen, as consigner (censorship unit), consigner address, test specimen title, model specification, numbering, manufacturer etc.;
B) test specimen is received and sent messages, as being subject to sample date, transmitting-receiving serial number, vesting instrument numbering etc.;
C) relevant information during calibration, as report number, calibration/testDate, calibration/test environment conditions, calibration/test man, verifier etc.;
D) explanation of test specimen calibration/test result.
Concrete operations: press " interpolation " button, after above information of being totally lost, pressing " preservation " button can deposit data in database.If input wrong, the button such as " amendment " or " deletion " can be pressed and modify and deletion action.
2) input of standards and metrology instrument information
The technological document (standard) used when a) calibrating/test;
The measurement instrument used when b) calibrating/test and service condition record thereof.
When the measurement instrument used when certain is calibrated/tests had in the last week valid period, automatically show redness in the color of " validity period of certificate limit " hurdle date corresponding section, show non-serviceable warning in " use/no " simultaneously.
Concrete operations: press after " utensil interpolation " button inputs complete information, press " preservation " button and data are saved in database, if input wrong, the record that will revise please be choose to click amendment and deletion that " amendment " or " deletion " button realizes data.
3) input of calibrating device setting and calibration/test event information
A) multimeter that DC voltage, DC current, alternating voltage (ripple voltage) use is selected.
B) resitstance voltage divider intrinsic standoff ratio in direct current standard voltage divider intrinsic standoff ratio, DC Standard Resistor resistance, ripple voltage measurement mechanism, default value is respectively 10000,1000,1000, and pressing drop-down key can change.
C) the visual examination result of test specimen and insulation measurement result.
This window is used for detecting or calibrating following parameter:
D) test specimen ripple factor;
E) the actual measurement capacity of test specimen;
4) high-pressure sampling unit
This some work is controlled by PC, and it is started working after 3 interface information inputs before completing;
5) high pressure conversion portion
This partial action is the high pressure sent by high voltage direct current generator, by three unit voltage dividers, converts the low pressure that range measured by applicable digital voltmeter to, for the corresponding signal of digital voltmeter collection.
6) digital voltmeter
This part adopts the digital multimeter of U.S. Agilent 34401A to carry out signals collecting.
Carry out signal sampling by the A/D in table during work, and the analog quantity collected is converted to digital quantity corresponding with it, be uploaded to PC by serial ports.
7) data processing of PC
The data stream software that PC will be uploaded, measures according to each respective interface control overflow, calculates, and form software completion report/record preview, storage, printing by report
The application's voltage indicating value, electric current indicating value, AC ripple and capacity four parameters disposable completes measurement data acquisition, transmission, storage, process, automatically Generates Certificate, and Auto-Memory preserves historical record; By voltage coefficient and the error of software mode correction high-voltage bleeder sampling unit; Remote controlled, data are sent to backstage.
Complete this four parametric techniques: first piece of table is by sampling the resitstance voltage divider U2 of ripple voltage divider lower end; Second piece of table, by pull-up resistor lower end sampling standard resistance, reads the voltage U3 with current in proportion; 3rd piece of table, by standard voltage divider sampling, reads la tension de reference Uref est parameter.Then according to the value error of corresponding algorithm determination voltage, electric current, and ripple, capacity size.
So-called disposablely completes measurement, refer to that high voltage direct current generator is from zero to a boost process of rated voltage, completes four parameter measurements.That is, reach voltage indicating value in boosting, just determine voltage measuring value.Reach electric current indicating value and just determine current measurement value.Determine the measured value of ripple and capacity simultaneously.
Claims (3)
1. a novel high voltage direct current generator calibration equipment, it is characterized in that, comprise ripple and measure sampling unit, pull-up resistor unit and voltage standard sampling unit, described ripple is measured sampling unit and is comprised the high-voltage filtering capacitor and resitstance voltage divider that are in series, pull-up resistor unit comprises the pull-up resistor and sample resistance that are in series, voltage standard sampling unit comprises standard voltage divider, described ripple measures sampling unit, pull-up resistor unit and voltage standard sampling unit are all connected with computing machine by digital voltmeter, the high pressure that high voltage direct current generator sends measures sampling unit by ripple, the voltage divider of pull-up resistor unit and voltage standard sampling unit converts the low pressure that range measured by applicable digital voltmeter to, computing machine is sent to for the corresponding signal of digital voltmeter collection.
2. a kind of novel high voltage direct current generator calibration equipment as claimed in claim 1, is characterized in that, described ripple is measured sampling unit, pull-up resistor unit and voltage standard sampling unit and powered by high-voltage power supply.
3. a kind of novel high voltage direct current generator calibration equipment as claimed in claim 1, is characterized in that, computing machine is connected with digital voltmeter by USB line.
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|---|---|---|---|
| CN201520053732.7U CN204359923U (en) | 2015-01-26 | 2015-01-26 | A kind of novel high voltage direct current generator calibration equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520053732.7U CN204359923U (en) | 2015-01-26 | 2015-01-26 | A kind of novel high voltage direct current generator calibration equipment |
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| Publication Number | Publication Date |
|---|---|
| CN204359923U true CN204359923U (en) | 2015-05-27 |
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ID=53261385
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976647A (en) * | 2018-01-24 | 2018-05-01 | 镇江市计量实验工厂 | A kind of high-voltage high resistance calibrating instrument intelligence calibrating installation |
| CN108710095A (en) * | 2018-08-07 | 2018-10-26 | 河南省计量科学研究院 | A kind of impulse voltage generator calibrating installation based on linearity analysis |
| CN108761367A (en) * | 2018-04-20 | 2018-11-06 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | One kind ± 800kV extra-high voltage direct-current divider calibrate analysis method |
| CN116755021A (en) * | 2023-08-21 | 2023-09-15 | 中国计量科学研究院 | Calibrating device and calibrating method for direct-current high-voltage divider |
-
2015
- 2015-01-26 CN CN201520053732.7U patent/CN204359923U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976647A (en) * | 2018-01-24 | 2018-05-01 | 镇江市计量实验工厂 | A kind of high-voltage high resistance calibrating instrument intelligence calibrating installation |
| CN108761367A (en) * | 2018-04-20 | 2018-11-06 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | One kind ± 800kV extra-high voltage direct-current divider calibrate analysis method |
| CN108710095A (en) * | 2018-08-07 | 2018-10-26 | 河南省计量科学研究院 | A kind of impulse voltage generator calibrating installation based on linearity analysis |
| CN108710095B (en) * | 2018-08-07 | 2024-06-04 | 河南省计量测试科学研究院 | Impulse voltage generator calibrating device based on linearity analysis |
| CN116755021A (en) * | 2023-08-21 | 2023-09-15 | 中国计量科学研究院 | Calibrating device and calibrating method for direct-current high-voltage divider |
| CN116755021B (en) * | 2023-08-21 | 2023-11-24 | 中国计量科学研究院 | Calibrating device and calibrating method for direct-current high-voltage divider |
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