CN110412393A - Line build-out method for ac voltage withstanding test - Google Patents
Line build-out method for ac voltage withstanding test Download PDFInfo
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- CN110412393A CN110412393A CN201810396711.3A CN201810396711A CN110412393A CN 110412393 A CN110412393 A CN 110412393A CN 201810396711 A CN201810396711 A CN 201810396711A CN 110412393 A CN110412393 A CN 110412393A
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- electric current
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Abstract
The invention proposes a kind of line build-out methods for ac voltage withstanding test, the following steps are included: (1) is not in the case where connecing measured object, carry out self-checking, start the interference electric current detection operation of instrument, export certain voltage, voltage effective value U, current effective value I0 and active-power P 0 at this time is measured, the phase angle φ 0 of voltage and electric current is calculated, and saves I0 and φ 0；(2) in the case where connecing measured object test, proper testing is carried out, starts the proper testing movement of instrument, that is, exports same voltage, voltage effective value U, current effective value I1 and active-power P 1 at this time is measured, the phase angle φ 1 of voltage and electric current is calculated；(3) vector operation is carried out, the absolute value of the difference δ φ of the current phase angle of proper testing and self-checking is obtained, trigonometric function relationship is then utilized, obtains target current I.The present invention provides a kind of line build-out method for being effectively used for ac voltage withstanding test, to adapt to the line conditions of various complexity.
Description
Technical field
The present invention relates to a kind of line build-out methods for ac voltage withstanding test.
Background technique
Ac voltage withstanding test is an important test item of safety test, and means are by measured object (such as household electrical appliances)
Power supply line and ground wire (or shell) between apply certain alternating voltage (such as 5000V), then measure the leakage current of formation.
The size of leakage current by as producer judge measured object whether He Ge important evidence, so can measure accurate very crucial.
But have a problem that among these, there is also certain leakage currents after application of a voltage for test equipment itself route itself, more
The serious is curstomer's site would generally secondary wiring, so measurement circuit can be longer, leakage current can be bigger.This requires pressure resistances
Test equipment can adapt to these situations, that is, can cut these influence factors, we are commonly referred to as route at industry
Compensation.
Previous method usually directly carries out the arithmetic subtraction operation of current effective value, but less effective, often subtracts
Complete obtained effective current value is more much smaller than the actual leakage current values of measured object, and therefore, it is necessary to invent a kind of effective compensation
Mode, to adapt to the line conditions of various complexity.
Summary of the invention
Based on the above issues, present invention aims above situation is directed to, one kind is provided and is effectively used for ac voltage withstanding survey
The line build-out method of examination, to adapt to the line conditions of various complexity.
In view of the above problems, providing following technical solution: for the line build-out method of ac voltage withstanding test, feature
It is: the following steps are included:
(1) it in the case where not connecing measured object, carries out self-checking, starts the interference electric current detection operation of instrument, i.e., it is defeated
Certain voltage out measures voltage effective value U, current effective value I0 and active-power P 0 at this time, using following formula:
Cos (φ 0)=P0/ (U*I0)
The phase angle φ 0 of voltage and electric current is calculated, and saves I0 and φ 0, referred to as self-test value；
(2) in the case where connecing measured object test, proper testing is carried out, starts the proper testing movement of instrument, that is, exports
Same voltage measures voltage effective value U, current effective value I1 and active-power P 1 at this time, using following formula:
Cos (φ 1)=P1/ (U*I1)
The phase angle φ 1 of voltage and electric current is calculated；
(3) vector operation is carried out, the absolute value of the difference δ φ of the current phase angle of proper testing and self-checking is obtained:
δ φ=| φ 1- φ 0 |
Using trigonometric function relationship, target current I is obtained:
I=sqrt ((I1*cos (δ φ)-I0)2+(I1*sin(δφ))2)
Sqrt is extraction of square root operation in formula.
Beneficial effects of the present invention: by analysis it is found that either instrument itself route, secondary wiring extension route also
It is that may finally be equivalent to the combination of ideal inductance, ideal resistance and ideal capacitance, we term it equivalent inside measured object
Impedance.After certain voltage is applied to equivalent impedance, a virtual value and phase electric current associated with impedance will be formed, into
When row line compensates, it is necessary to which virtual value and phase, which are involved in operation, correctly to be cut the interference electric current of route, also
It is vector operation to be carried out, rather than the arithmetic of simple virtual value subtracts each other.It is mended using the above-mentioned route for ac voltage withstanding test
After compensation method, by self-checking and proper testing, the interference electric current of route can be cut and obtained target current, implementation process
It is simple and effective accurate.
Detailed description of the invention
The schematic diagram calculation that Fig. 1 is phase angle φ 1 in step (2) in the embodiment of the present invention；
Specific embodiment
Specific embodiments of the present invention will be described in further detail below.The following examples are intended to illustrate the invention,
But it is not intended to limit the scope of the invention.
A kind of line build-out method for ac voltage withstanding test, comprising the following steps:
(1) it in the case where not connecing measured object, carries out self-checking, starts the interference electric current detection operation of instrument, i.e., it is defeated
Certain voltage out measures voltage effective value U, current effective value I0 and active-power P 0 at this time, using following formula:
Cos (φ 0)=P0/ (U*I0)
The phase angle φ 0 of voltage and electric current is calculated, and saves I0 and φ 0, referred to as self-test value；
(2) in the case where connecing measured object test, proper testing is carried out, starts the proper testing movement of instrument, that is, exports
Same voltage measures voltage effective value U, current effective value I1 and active-power P 1 at this time, using following formula:
Cos (φ 1)=P1/ (U*I1)
The phase angle φ 1 of voltage and electric current is calculated, as shown in Figure 1；
(3) vector operation is carried out, the absolute value of the difference δ φ of the current phase angle of proper testing and self-checking is obtained:
δ φ=| φ 1- φ 0 |
Using trigonometric function relationship, target current I is obtained:
I=sqrt ((I1*cos (δ φ)-I0)2+(I1*sin(δφ))2)
Sqrt is extraction of square root operation in formula.
Realize that corresponding program source code used by above-mentioned function is described as follows:
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, above-mentioned hypothesis these
Improvement and modification also should be regarded as protection scope of the present invention.
Claims (1)
1. the line build-out method for ac voltage withstanding test, it is characterised in that: the following steps are included:
(1) in the case where not connecing measured object, self-checking is carried out, the interference electric current detection operation of instrument is started, that is, export one
Fixed voltage measures voltage effective value U, current effective value I0 and active-power P 0 at this time, using following formula:
Cos (φ 0)=P0/ (U*I0)
The phase angle φ 0 of voltage and electric current is calculated, and saves I0 and φ 0, referred to as self-test value；
(2) in the case where connecing measured object test, proper testing is carried out, starts the proper testing movement of instrument, is i.e. output is same
Voltage, measure voltage effective value U, current effective value I1 and active-power P 1 at this time, using following formula:
Cos (φ 1)=P1/ (U*I1)
The phase angle φ 1 of voltage and electric current is calculated；
(3) vector operation is carried out, the absolute value of the difference δ φ of the current phase angle of proper testing and self-checking is obtained:
δ φ=| φ 1- φ 0 |
Using trigonometric function relationship, target current I is obtained:
I=sqrt ((I1*cos (δ φ)-I0)2+(I1*sin(δφ))2)
Sqrt is extraction of square root operation in formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810396711.3A CN110412393B (en) | 2018-04-28 | 2018-04-28 | Line compensation method for alternating current withstand voltage test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810396711.3A CN110412393B (en) | 2018-04-28 | 2018-04-28 | Line compensation method for alternating current withstand voltage test |
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| CN110412393A true CN110412393A (en) | 2019-11-05 |
| CN110412393B CN110412393B (en) | 2021-08-31 |
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| CN201810396711.3A Active CN110412393B (en) | 2018-04-28 | 2018-04-28 | Line compensation method for alternating current withstand voltage test |
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Citations (7)
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| CN201203938Y (en) * | 2008-01-25 | 2009-03-04 | 陕西永辉测控技术有限公司 | Cable wireless test system |
| CN201449435U (en) * | 2009-04-10 | 2010-05-05 | 株洲中达特科电子科技有限公司 | Interturn pressure test device |
| US20120139554A1 (en) * | 2010-12-06 | 2012-06-07 | Parsons Mark A | Power Conductor Monitoring Device and Method of Calibration |
| CN203310990U (en) * | 2013-06-06 | 2013-11-27 | 陕西省电力公司规划评审中心 | On-site accuracy verification device for 750 kV current transformer |
| CN104535954A (en) * | 2015-01-12 | 2015-04-22 | 长沙天恒测控技术有限公司 | Calibration device of active leakage current tester |
| CN204347229U (en) * | 2015-01-12 | 2015-05-20 | 长沙天恒测控技术有限公司 | The calibrating installation of active leakage current tester |
| US20160054421A1 (en) * | 2014-08-19 | 2016-02-25 | Dipl.-Ing. H. Horstmann Gmbh | Method for calibrating a short circuit indicator with direction detection and short circuit indicator to use such a method |
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2018
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201203938Y (en) * | 2008-01-25 | 2009-03-04 | 陕西永辉测控技术有限公司 | Cable wireless test system |
| CN201449435U (en) * | 2009-04-10 | 2010-05-05 | 株洲中达特科电子科技有限公司 | Interturn pressure test device |
| US20120139554A1 (en) * | 2010-12-06 | 2012-06-07 | Parsons Mark A | Power Conductor Monitoring Device and Method of Calibration |
| CN203310990U (en) * | 2013-06-06 | 2013-11-27 | 陕西省电力公司规划评审中心 | On-site accuracy verification device for 750 kV current transformer |
| US20160054421A1 (en) * | 2014-08-19 | 2016-02-25 | Dipl.-Ing. H. Horstmann Gmbh | Method for calibrating a short circuit indicator with direction detection and short circuit indicator to use such a method |
| CN104535954A (en) * | 2015-01-12 | 2015-04-22 | 长沙天恒测控技术有限公司 | Calibration device of active leakage current tester |
| CN204347229U (en) * | 2015-01-12 | 2015-05-20 | 长沙天恒测控技术有限公司 | The calibrating installation of active leakage current tester |
Non-Patent Citations (3)
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| W.G. DOWNING: "Magnitude and phase vs. frequency distortion compensation for an esophageal balloon pleural pressure measurement system", 《PROCEEDINGS OF WESCON "94》 * |
| 钱立文 等: "交直流薄膜耐压测试仪的研制", 《电子工业专用设备》 * |
| 韦江宇: "浅谈安全性能综合测试仪的校准方法", 《机械工业标准化与质量》 * |
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| CN110412393B (en) | 2021-08-31 |
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