CN1132859A - Dielectric loss measuring method and equipment for high-voltage electrical equipment - Google Patents
Dielectric loss measuring method and equipment for high-voltage electrical equipment Download PDFInfo
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- CN1132859A CN1132859A CN 95103913 CN95103913A CN1132859A CN 1132859 A CN1132859 A CN 1132859A CN 95103913 CN95103913 CN 95103913 CN 95103913 A CN95103913 A CN 95103913A CN 1132859 A CN1132859 A CN 1132859A
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Abstract
A method and its apparatus for measuring the dielectric loss angle of high-voltage electric appliances features that a capacitor leakage current easy to measure is additionally used as value to be measured and added with the leakage current of electric appliance to be measured, and their sum is used to indirectly measure the dielectric loss angle of said electric appliance without directly measuring the difference between leakage current of the electric appliance and test voltage. Its advantages are high precision, resolution and stability.
Description
The present invention relates to electromagnetic measurement field, say to relate to a kind of High-Voltage Electrical Appliances dielectric loss measurement method and device with possessing.
Known High-Voltage Electrical Appliances dielectric loss measurement method is to use the high-tension bridge principle, utilize adjustable resistor and adjustable condenser that the leakage current of equipment under test is carried out balance, reading of data, the shortcoming of this method are the accuracy requirement height to components and parts, it is very complicated to operate, and test period is long.
In recent years, domestic and international many people have attempted utilizing one chip microcomputer to develop intelligent dielectric loss measurement instrument.For example " Guangxi power technology " fourth phase in 1992 goes up in " can eliminate the power high voltage equipment dielectric loss measuring method of disturbing effect " literary composition of publication, a kind of dielectric loss measurement method and device have been introduced, it is basic identical that method that its uses and principle and high-tension bridge are directly measured the method for equipment under test leakage current, the advantage of its measurement mechanism is to have adopted the single-chip microcomputer actual measurement system, can carry out data processing automatically, but this method is directly to measure differing of equipment under test and reference voltage, this angle is very near 90 degree, because dielectric loss angle is very little, the phase angle difference of sensor self has met or exceeded the dielectric loss angle, therefore, when utilizing said method to measure, resolving power is poor, and stability is bad, measuring accuracy is low, is difficult to be applied to site test.
The purpose of this invention is to overcome the deficiencies in the prior art, it is poor to solve measurement resolution, precision is low, requires high and problem such as stability is bad to components and parts, proposes the intelligent measurement mechanism that a kind of simple and easy to do not needing directly surveyed the method for equipment under test leakage current and realized this method.
The objective of the invention is by the following method to realize with device.
It comprises a kind of High-Voltage Electrical Appliances dielectric loss measurement method: 1. the people for generate one new measured, promptly increase by one road capacitance leakage electric current specially
, its amplitude and high pressure equipment under test leakage current
Amplitude be same grade; 2. with the capacitive character leakage current
With the equipment under test leakage current
It is measured promptly to synthesize another
3. utilize two weak current sensors 5 and 6 with above-mentioned two measured
With
Deliver to single-chip microcomputer actual measurement parts 7 and carry out data processing: it is two measured to utilize Fourier transformation algorithm to calculate
With
Amplitude and differ ψ, then with measuring amount
Be decomposed into the capacitance leakage electric current
In-phase component
Promptly
And quadrature component
Promptly
, quadrature component wherein
It promptly is the equipment under test leakage current
Resistive current component, the capacitance leakage electric current
Deduct in-phase component
It is exactly the equipment under test leakage current
Capacitive component, the merchant of above-mentioned resistive component and capacitive component is exactly the tangent value of the equipment under test dielectric loss angle δ that requires of the present invention, can obtain dielectric loss angle δ by arctangent computation again.
The measurement mechanism 8 of realizing said method is by power supply 1, transformer 2, be the special electric capacity 3 that uses of this method, two weak current sensors 5 and 6 and single-chip microcomputer actual measurement parts 7 form, the former edge joint 220V power supply 1 of transformer 2, one utmost point of sampling capacitance 3 directly connects with the Fu Bianyi of transformer 2 end, another utmost point of sampling capacitance 3 links to each other with the earth terminal on 2 pairs of limits of transformer behind weak current sensor 6 and weak current sensor 5 again, two sensors 5 and 6 is with measured two input end IN1 and the IN2 that deliver to single-chip microcomputer actual measurement parts 7, the input end IN3 who has a tap and single-chip microcomputer to survey parts 7 in the middle of the limit that pays of transformer 2 links to each other in addition, provide reference voltage signal to single-chip microcomputer actual measurement parts 7, pair limit and sampling capacitance 3 direct coupled terminals of transformer 2 are drawn outside the measurement mechanism, the earth terminal on 2 pairs of limits of transformer is drawn behind sensor 5 outside the measurement mechanism again, and this two end line is as connecting equipment under test 4.
The method that this invention adopts is to differ and be the indirect measuring media loss angle of the sinusoidal quantity of tens of degree by measuring two, therefore very not high to the accuracy requirement of sensor, even what influence the phase shift of sensor degree of having level can not bring to measurement result yet, generally control differing at half degree between the sensor primary and secondary with interior just passable.Utilize this method that the angle-resolved of tens of degree is easy to accomplish to dividing, so the measurement resolution height, this measurement mechanism resolving power is better than 1 * 10 after measured
-5Be the measurement mechanism of realizing that this method is made, debugging work is easy, and stability is fine, and precision can reach 0.1 grade, is applicable to site test.
The present invention is further detailed explanation below in conjunction with accompanying drawing.
Fig. 1 is measuring principle figure of the present invention;
Fig. 2 is a measurement polar plot of the present invention;
Fig. 3 is the theory diagram of single-chip microcomputer actual measurement parts 7;
Fig. 4 is an instrumentation plan of the present invention.
What this method related to all is relatively simple technology.In Fig. 1, the equipment under test 4 for example equivalent circuit of mutual inductor is a nonideal capacitor, at first choose the sampling capacitance 3 that equates substantially with the equipment under test capacitance according to the equipment under test capacitance, make current amplitude in sampling capacitance 3 and the equipment under test 4 at the same order of magnitude, because these two electric currents
With
Between phase differential very little (being generally classification), so between the electric current in sensor 5 and the sensor 6 promptly
With
Between phase differential be tens degree, carry out Fu Shi by single-chip microcomputer actual measurement parts 7 and calculate and can and differ ψ with the current amplitude in sensor 5 and the sensor 6 and calculate.Then by Single Chip Microcomputer (SCM) program with the electric current in the sensor 5
Be decomposed into electric current in the sensor 6
In-phase component
And quadrature component
, as Fig. 2, quadrature component wherein
It promptly is leakage current
Resistive current component, the electric current in the sensor 6
Deduct the in-phase component in the sensor 5
It is exactly leakage current
Capacitive component, the merchant of above-mentioned resistive component and capacitive component is exactly the tangent value of the dielectric loss angle δ that requires of the present invention, can obtain dielectric loss angle δ by arctangent computation again.Measurement result is shown by single-chip microcomputer actual measurement parts 7 numerals.
In Fig. 3, two input end IN1 of traffic pilot 9 link to each other with sensor 6 with sensor 5 respectively with IN2, and two is measured
With
Delivered to single-chip microcomputer actual measurement parts 7 by these two input ends, the centre tap on 2 pairs of limits of another input end IN3 and transformer of traffic pilot 9 links to each other, to obtain reference voltage signal.3 analog quantity inputs are carried out amplification filtering and A/D conversion again through behind the traffic pilot 9, become digital quantity, then, the digitized measured microprocessor 12 of delivering to carries out data processing, finishes the actual measurement function, is shown by display 13 and printer 15 at last and prints measurement result.
The present invention also can be used for the dielectric loss measurement of other power high voltage equipment such as oil switch, transformer.
Claims (2)
- A High-Voltage Electrical Appliances dielectric loss measurement method it comprise:(1). artificially generate one new measured, promptly increase by one road capacitance leakage electric current specially , its amplitude and high pressure equipment under test leakage current Amplitude be same grade;(2). with the capacitive character leakage current With the equipment under test leakage current It is measured promptly to synthesize another
(3). utilize two weak current sensors (5) and (6) with above-mentioned two measured With Deliver to single-chip microcomputer actual measurement parts (7) and carry out data processing: it is two measured to utilize Fourier transformation algorithm to calculateWith
Amplitude and differ (ψ), then with measuring amount Be decomposed into the capacitance leakage electric current
In-phase component Promptly
And quadrature component Promptly
Quadrature component wherein It promptly is the equipment under test leakage current
Resistive current component, the capacitance leakage electric current Deduct in-phase component
Be exactly the capacitive component of equipment under test leakage current (Ix), the merchant of above-mentioned resistive component and capacitive component is exactly the tangent value of the equipment under test dielectric loss angle (δ) that requires of the present invention, can obtain dielectric loss angle (δ) by arctangent computation again.
- One kind use the described method of claim 1 and custom-designed measurement mechanism (8) by power supply (1), transformer (2), sampling capacitance (3), two weak current sensors (5) and (6) and single-chip microcomputer actual measurement parts (7) are formed, wherein, the former edge joint 220V power supply (1) of transformer (2), it is characterized in that, one utmost point of this device sampling capacitance (3) directly connects with the Fu Bianyi of transformer (2) end, another utmost point of sampling capacitance (3) links to each other with the earth terminal that transformer (2) is paid the limit behind weak current sensor (6) and weak current sensor (5) again, two sensors (5) and (6) are with measured two input ends (IN1) of single-chip microcomputer actual measurement parts (7) and (IN2) delivered to, in addition, the limit of paying of transformer (2) has a centre tap to link to each other with an input end (IN3) of single-chip microcomputer actual measurement parts (7), provide reference voltage signal to single-chip microcomputer actual measurement parts (7), transformer (2) is paid the limit and the direct coupled terminal of sampling capacitance (3) is drawn outside the measurement mechanism (8), transformer (2) is paid the earth terminal on limit and is drawn behind sensor (5) outside the measurement mechanism (8) again, and this two end line is as connecting equipment under test (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95103913 CN1055160C (en) | 1995-04-06 | 1995-04-06 | Dielectric loss measuring method and equipment for high-voltage electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95103913 CN1055160C (en) | 1995-04-06 | 1995-04-06 | Dielectric loss measuring method and equipment for high-voltage electrical equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1132859A true CN1132859A (en) | 1996-10-09 |
| CN1055160C CN1055160C (en) | 2000-08-02 |
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ID=5074916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95103913 Expired - Fee Related CN1055160C (en) | 1995-04-06 | 1995-04-06 | Dielectric loss measuring method and equipment for high-voltage electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1055160C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100344979C (en) * | 2004-07-27 | 2007-10-24 | 谢文略 | High-voltage split-phase peak contact electroscopy |
| CN100535681C (en) * | 2006-04-17 | 2009-09-02 | 中国科学院半导体研究所 | On-line calibration and checking method for current inductor transformation ratio and angle difference |
| CN101285860B (en) * | 2008-06-06 | 2010-12-15 | 西安四方机电有限责任公司 | Device for testing high voltage large-capacity electrical apparatus dielectric loss tangent value |
| CN102981062A (en) * | 2012-12-20 | 2013-03-20 | 国网电力科学研究院武汉南瑞有限责任公司 | Insulation detection method for high voltage bushing based on frequency domain dielectric spectroscopy |
| CN105319447A (en) * | 2015-11-06 | 2016-02-10 | 西安科技大学 | Dielectric loss Tan delta test method and tester |
| CN107356816A (en) * | 2017-06-22 | 2017-11-17 | 国家电网公司 | A kind of capacitive equipment dielectric loss on-line checking table |
-
1995
- 1995-04-06 CN CN 95103913 patent/CN1055160C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100344979C (en) * | 2004-07-27 | 2007-10-24 | 谢文略 | High-voltage split-phase peak contact electroscopy |
| CN100535681C (en) * | 2006-04-17 | 2009-09-02 | 中国科学院半导体研究所 | On-line calibration and checking method for current inductor transformation ratio and angle difference |
| CN101285860B (en) * | 2008-06-06 | 2010-12-15 | 西安四方机电有限责任公司 | Device for testing high voltage large-capacity electrical apparatus dielectric loss tangent value |
| CN102981062A (en) * | 2012-12-20 | 2013-03-20 | 国网电力科学研究院武汉南瑞有限责任公司 | Insulation detection method for high voltage bushing based on frequency domain dielectric spectroscopy |
| CN105319447A (en) * | 2015-11-06 | 2016-02-10 | 西安科技大学 | Dielectric loss Tan delta test method and tester |
| CN107356816A (en) * | 2017-06-22 | 2017-11-17 | 国家电网公司 | A kind of capacitive equipment dielectric loss on-line checking table |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1055160C (en) | 2000-08-02 |
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