CN108957380A - The development of capacitance type potential transformer no-load voltage ratio, polarity test instrument - Google Patents
The development of capacitance type potential transformer no-load voltage ratio, polarity test instrument Download PDFInfo
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- CN108957380A CN108957380A CN201810830300.0A CN201810830300A CN108957380A CN 108957380 A CN108957380 A CN 108957380A CN 201810830300 A CN201810830300 A CN 201810830300A CN 108957380 A CN108957380 A CN 108957380A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
Abstract
The present invention provides a kind of efficient and safe instruments for being exclusively used in capacitance type potential transformer no-load voltage ratio, polarity test.The instrument includes high voltage output module, voltage signal acquisition and computing module；The high voltage output module includes primary side step-up transformer and High voltage output divider resistance unit, and the two is connected in parallel；The High voltage output divider resistance unit includes a high-power high voltage resistance and three high-precision wire-wound resistors；Wherein capacitance type potential transformer is accessed in one end of high-power high voltage resistance, and the other end and high-precision wire are connected in series around resistance；Using being connected in parallel, one end ground connection, the other end and high-power high voltage resistance are connected in series and draw high pressure partial pressure output end three high-precision wire-wound resistors.The development of the instrument, has filled up testing capacitor formula voltage transformer no-load voltage ratio, polarity test does not have the blank of special instrument, has many advantages, such as that easy work, safe and practical, efficient work, anti-noise are strong, at low cost.
Description
Technical field:
The present invention relates to a kind of power test fields, and in particular to a kind of capacitance type potential transformer no-load voltage ratio, polarity test
Instrument.
Background technique:
In recent years, as China's power industry and electric power network technique keep reforming development, in order to ensure the justice of electrical energy measurement
Just, exact specification, China's measurement Law regulation, it is necessary to field-checking periodically be carried out to mutual inductor, so that capacitor voltage
Effect of the mutual inductor in energy metering is increasing.Currently, the integrated level of capacitance type potential transformer scene calibration equipment
It is not high, formula field-checking mode of removing stage makeup and costume is mostly used greatly, not only both testing equipment is be easy to cause to damage, while being wasted huge
Manpower and material resources, and when carrying out on-site assembly every time, since the relative position between each complete set of equipments is all not quite similar, increase point
The uncertainty of cloth parameter, is not fixed very much so as to cause the additive error introduced by measuring system, seriously affects measurement sometimes
As a result the judgement to test product performance is even influenced.
When wherein carrying out no-load voltage ratio, polarity test to capacitance type potential transformer at the construction field (site), the examination is directed to due to lacking
The special test equipment of project is tested, carries out no-load voltage ratio, polarity test usually using following method: first using dielectric loss instrument high as exchange
Excitation power supply is pressed, output high-voltage signal, digital multimeter are measured in voltage transformer secondary, carry out the test of no-load voltage ratio；Electricity consumption again
Pond group and pointer multimeter carry out polar test.There are test result error is very big when carrying out the test in aforementioned manners, examination
Test the problems such as process hazard is high, and the test procedure is cumbersome, and test efficiency is low.Although domestic certain dielectric loss instrument have condenser type
Voltage transformer no-load voltage ratio test function, but the dielectric loss instrument boosts every time can only carry out the no-load voltage ratio test an of secondary coil.Examination
It is more to test process time-consuming, inefficiency is not able to satisfy site safety and efficiently tests demand.Furthermore the instrument is carrying out no-load voltage ratio examination
When testing, Check up polarity not can be carried out.Utility model CN203287467U discloses a kind of voltage transformer no-load voltage ratio polarity test dress
It sets, which includes air switch, and one end is connected between firewire and zero curve, another termination pressure regulator；The one of the pressure regulator
Terminated line A630, another terminated line N630；First voltage table is connected between the line A630 and the line N630；Online L630
Second voltage table is connected between the line N630.The voltage value shown by observation first voltage table and second voltage table, i.e.,
It can detect that whether voltage transformer no-load voltage ratio incorrect polarity problem occurs, but the utility model needs further artificial calculating,
No-load voltage ratio result can just be obtained.
For these reasons, on the basis of fully understanding capacitance type potential transformer working principle, in conjunction with for many years
Work on the spot experience, easy, safe and practical, efficient work that the present invention provides a kind of work, anti-noise be strong, it is at low cost, specially into
The instrument of row capacitance type potential transformer no-load voltage ratio, polarity test.Testing capacitor formula voltage transformer has been filled up in the development of the instrument
No-load voltage ratio, polarity test do not have the blank of special instrument.Research achievement belong to it is domestically leading, once succeed in developing, application prospect
It is wide.
Summary of the invention:
Capacitance type potential transformer no-load voltage ratio, polarity test process hazard are high, process is tedious in the prior art to solve and
The problems such as inefficiency, efficient and safe is exclusively used in capacitance type potential transformer no-load voltage ratio, polarity examination the present invention provides a kind of
The instrument tested.Specific technical solution is as follows:
A kind of capacitance type potential transformer no-load voltage ratio, polarity test instrument, the instrument include high voltage output module and voltage letter
Number acquisition and computing module；Described two block coupled in series connect；The high voltage output module includes primary side step-up transformer
With High voltage output divider resistance unit, the two is connected in parallel.
The test apparatus primary voltage output area is 1000-10000V, and double measurement voltage is 0-100V, design essence
Degree is 0.2 grade.
The High voltage output divider resistance unit includes a high-power high voltage resistance and three high-precision wire-wound resistors；
Wherein testing capacitance formula voltage transformer is accessed in one end of high-power high voltage resistance, and the other end and high-precision wire are connected phase around resistance
It connects and draws high pressure partial pressure output end；High pressure divides output end access voltage signal acquisition and computing module；High-precision wire is around electricity
The other end of resistance is grounded, and three high-precision wire-wound resistors, which use, to be connected in parallel.
Preferably, the high-power high voltage resistance is 100M Ω/25W, and high-precision wire-wound resistor is 200K Ω/2W.
The voltage signal acquisition and computing module uses high-precision adc chip LTC1856, ADIN_ in the chip
CH0 acquires the high-pressure side voltage division signal of high pressure partial pressure output end output；ADIN_CH1, ADIN_CH2, ADIN_CH3, ADIN_CH4
Acquire the low-side signal of testing capacitance formula voltage transformer output.
The high-precision adc chip LTC1856 is 16, has positive and negative 10V input, and theoretical resolution reaches 302Uv,
8 channel ADC signals are supported to sample, sampling rate 100kbps samples 50Hz AC signal, can reach at real-time acquisition
Reason, and input terminal can withstand up to the high input voltage protection of 30V.
The signal sampled is carried out division arithmetic, operation by microprocessor by the high-precision adc chip LTC1856
As a result positive and negative is collected signal polarity, and the size of operation result is no-load voltage ratio.
The course of work of the instrument are as follows: connect point source, microprocessor can detect single-chip processor i/o mouth state first, work as limit
When bit switch is not pressed, I/O can export a high level, and microprocessor detects the high level at this time, show transformation of boosting
Device exports high pressure not in zero-bit, and driving circuit understands driving transformer at this time, so that after limit switch is pressed, instrument High voltage output
Reach zero-bit；Four low survey pressure output ends that high pressure divides output end and capacitance type potential transformer are accessed into instrument at this time；It is micro-
The signal sampled is carried out division arithmetic by processor, operation result is shown on the display screen of instrument, wherein operation result
Positive and negative is collected signal polarity, and the size of operation result is no-load voltage ratio；Finally operation result is recorded and saves printing.
The invention has the following advantages:
One, the automation equipment degree is high, and software design hommization, man-machine interface is friendly, easy to operate.It is automatic when test
Boosting, output voltage precision is controllable, only needs primary connection, can be automatically performed 500kV and following all kinds of capacitor voltage mutual inductances
All secondary coil no-load voltage ratios of device, polar test.
Two, the Hi-pot test line of existing dielectric loss instrument is made full use of, reasonable arrangement the test procedure, after testing no-load voltage ratio polarity,
Second of wiring is not needed, so that it may carry out subsequent dielectric loss test, greatly shorten the testing time, improve testing efficiency, really do
To the effect got twice the result with half the effort.
Three, the setting of High voltage output divider resistance unit improves partial pressure precision and temperature stability, due to dividing precision
Reliably, Rational Parameters ensure that subsequent ADC acquisition precision.Current non-dedicated instrument can only measure capacitance type potential transformer
No-load voltage ratio value, measurement accuracy can only achieve ± 5% or so, and no-load voltage ratio measurement accuracy not only can be increased to 0.2% by the instrument.
Four, the high-precision adc chip LTC1856 sampling rate used adopts 50Hz AC signal up to 100kbps
Sample can reach timely collection, further ensure that authenticity, the reliability of field measurement data.
Five, it is detected using limit switch, use process safety coefficient is high, and defencive function is perfect, to ensure that tester
The personal safety of member.
Detailed description of the invention:
Fig. 1 is instrument working principle diagram
Fig. 2 is high voltage output module schematic diagram
Fig. 3 is ADC acquisition module
Specific embodiment:
A kind of capacitance type potential transformer no-load voltage ratio, polarity test instrument, which includes high voltage output module, voltage signal
Acquisition and computing module.The high voltage output module includes primary side step-up transformer and High voltage output divider resistance unit,
The two is connected in parallel.
The High voltage output divider resistance unit includes a high-power high voltage resistance R1 (100M Ω/25W) and three
High-precision wire-wound resistor R2-R4 (200K Ω/2W)；Wherein R1 one end access testing capacitance formula voltage transformer, the other end with
R2-R4 is connected in series and draws high pressure partial pressure output end；High pressure divides output end access voltage signal acquisition and computing module；
The other end of R2-R4 is grounded, and R2, R3 and R4 are used and be connected in parallel.The voltage signal acquisition is with computing module using high-precision
ADC chip LTC1856 is spent, the high-pressure side voltage division signal of ADIN_CH0 acquisition high pressure partial pressure output end output in the chip；
ADIN_CH1, ADIN_CH2, ADIN_CH3, ADIN_CH4 acquire the low pressure of testing capacitance formula voltage transformer output
Side signal.
The high-precision adc chip LTC1856 is 16, has positive and negative 10V input, and theoretical resolution reaches 302Uv,
8 channel ADC signals are supported to sample, sampling rate 100kbps samples 50Hz AC signal, can reach at real-time acquisition
Reason, and input terminal can withstand up to the high input voltage protection of 30V.
The signal sampled is carried out division arithmetic, operation by microprocessor by the high-precision adc chip LTC1856
As a result positive and negative is collected signal polarity, and the size of operation result is no-load voltage ratio.
The course of work of the instrument are as follows: connect point source, microprocessor can detect single-chip processor i/o mouth state first, work as limit
When bit switch is not pressed, I/O can export a high level, and microprocessor detects the high level at this time, show transformation of boosting
Device exports high pressure not in zero-bit, and driving circuit understands driving transformer at this time, so that after limit switch is pressed, instrument High voltage output
Reach zero-bit；Four low survey pressure output ends that high pressure divides output end and capacitance type potential transformer are accessed into instrument at this time；It is micro-
The signal sampled is carried out division arithmetic by processor, operation result is shown on the display screen of instrument, wherein operation result
Positive and negative is collected signal polarity, and the size of operation result is no-load voltage ratio；Finally operation result is recorded and saves printing.
Claims (10)
1. a kind of capacitance type potential transformer no-load voltage ratio, polarity test instrument, which is characterized in that the test apparatus includes that high pressure is defeated
Module and voltage signal acquisition and computing module out；It is connected in series between two modules；The high voltage output module includes one
Secondary side boosting transformer and High voltage output divider resistance unit, the two are connected in parallel.
2. test apparatus according to claim 1, which is characterized in that the test apparatus primary voltage output area is
1000-10000V, double measurement voltage are 0-100V, and design accuracy is 0.2 grade.
3. test apparatus according to claim 1, which is characterized in that the High voltage output divider resistance unit includes one
A high-power high voltage resistance and three high-precision wire-wound resistors；Wherein one end access testing capacitance formula electricity of high-power high voltage resistance
Mutual inductor is pressed, the other end and high-precision wire are connected in series around resistance and draw high pressure partial pressure output end；High pressure partial pressure output termination
Enter voltage signal acquisition and computing module；The other end of high-precision wire-wound resistor is grounded, and three high-precision wire-wound resistors are using simultaneously
Connection connects.
4. test apparatus according to claim 3, which is characterized in that the high-power high voltage resistance is 100M Ω/25W.
5. test apparatus according to claim 3, which is characterized in that the high-precision wire-wound resistor is 200K Ω/2W.
6. test apparatus according to claim 1, which is characterized in that the voltage signal acquisition and computing module uses
High-precision adc chip LTC1856.
7. test apparatus according to claim 6, which is characterized in that ADIN_ in the high-precision adc chip LTC1856
CH0 acquires the high-pressure side voltage division signal of high pressure partial pressure output end output；ADIN_CH1, ADIN_CH2, ADIN_CH3, ADIN_CH4
Acquire the low-side signal of testing capacitance formula voltage transformer output.
8. test apparatus according to claim 6, which is characterized in that the high-precision adc chip LTC1856 is 16
Position has positive and negative 10V input, and theoretical resolution reaches 302Uv, supports the sampling of 8 channel ADC signals, and sampling rate is
100kbps samples 50Hz AC signal, can reach timely collection, and input terminal can withstand up to 30V high pressure it is defeated
Enter protection.
9. test apparatus according to claim 6, which is characterized in that the high-precision
The signal sampled is carried out division arithmetic by microprocessor by ADC chip LTC1856, and the positive and negative of operation result is acquisition
The signal polarity arrived, the size of operation result are no-load voltage ratio.
10. test apparatus according to claim 1, which is characterized in that the course of work of the test apparatus are as follows: connect point
Source, microprocessor can detect single-chip processor i/o mouth state first, and when limit switch is not pressed, I/O can export one high electricity
Flat, microprocessor detects the high level at this time, shows step-up transformer output high pressure not in zero-bit, driving circuit can drive at this time
Dynamic transformer, so that instrument High voltage output reaches zero-bit after limit switch is pressed；High pressure is divided into output end and capacitor at this time
Four of formula voltage transformer are low, and survey pressure output end accesses instrument；The signal sampled is carried out division arithmetic, fortune by microprocessor
Calculate as the result is shown on the display screen of instrument, the positive and negative of wherein operation result is collected signal polarity, operation result it is big
Small is no-load voltage ratio；Finally operation result is recorded and saves printing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810830300.0A CN108957380B (en) | 2018-07-25 | 2018-07-25 | Development of transformation ratio and polarity test instrument of capacitor voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810830300.0A CN108957380B (en) | 2018-07-25 | 2018-07-25 | Development of transformation ratio and polarity test instrument of capacitor voltage transformer |
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| Publication Number | Publication Date |
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| CN108957380A true CN108957380A (en) | 2018-12-07 |
| CN108957380B CN108957380B (en) | 2020-06-09 |
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| CN201810830300.0A Active CN108957380B (en) | 2018-07-25 | 2018-07-25 | Development of transformation ratio and polarity test instrument of capacitor voltage transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244110A (en) * | 2019-07-10 | 2019-09-17 | 无锡应达工业有限公司 | A kind of voltage sensor control module that more ratios are adjusted |
| CN112147549A (en) * | 2020-09-28 | 2020-12-29 | 广东电网有限责任公司肇庆供电局 | Transformer substation current transformer polarity testing device based on single chip microcomputer |
| CN112730970A (en) * | 2020-12-18 | 2021-04-30 | 扬州大学 | Isolated high-precision wide-range voltage measurement system and measurement method |
| CN114252674A (en) * | 2021-12-15 | 2022-03-29 | 中国化学工程第十一建设有限公司 | Secondary wiring detection device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244110A (en) * | 2019-07-10 | 2019-09-17 | 无锡应达工业有限公司 | A kind of voltage sensor control module that more ratios are adjusted |
| CN112147549A (en) * | 2020-09-28 | 2020-12-29 | 广东电网有限责任公司肇庆供电局 | Transformer substation current transformer polarity testing device based on single chip microcomputer |
| CN112730970A (en) * | 2020-12-18 | 2021-04-30 | 扬州大学 | Isolated high-precision wide-range voltage measurement system and measurement method |
| CN112730970B (en) * | 2020-12-18 | 2023-07-18 | 扬州大学 | Isolated high-precision wide-range voltage measurement system and measurement method |
| CN114252674A (en) * | 2021-12-15 | 2022-03-29 | 中国化学工程第十一建设有限公司 | Secondary wiring detection device and method |
| CN114252674B (en) * | 2021-12-15 | 2023-09-22 | 中国化学工程第十一建设有限公司 | Secondary wiring detection device and method |
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| CN108957380B (en) | 2020-06-09 |
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