CN87100002A - The acquisition methods of non-contact voltage phase signal and application thereof - Google Patents
The acquisition methods of non-contact voltage phase signal and application thereof Download PDFInfo
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- CN87100002A CN87100002A CN 87100002 CN87100002A CN87100002A CN 87100002 A CN87100002 A CN 87100002A CN 87100002 CN87100002 CN 87100002 CN 87100002 A CN87100002 A CN 87100002A CN 87100002 A CN87100002 A CN 87100002A
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Abstract
In electric instrument, the obtaining of the phase signal of relevant voltage adopted lead to introduce to surveying work and brought many inconvenience, when utilizing electric field around the tested phase line to obtain the preliminary voltage phase signal of tested phase line, around the voltage signal induction end, add screen layer to reduce to obtain the error of voltage phase signal with inducing method in the face of present situation the present invention.Can be in some measure field by temporary ground wire with further elimination interference reduction error.
Description
The invention relates to the acquisition methods of non-contact voltage phase signal in the electric instrument, is a kind of have certain anti-interference capability and simple again method.
In the field maintemance work for inspection of power transformation, distribution and the workshop of generating, power supply department and each industrial and mining enterprises, usually need to measure the phase relation between some electric parameters.And at present in the world in surveying work obtaining of voltage phase signal all use lead to introduce.Bring many inconvenience to surveying work.The product that 86 years 1 interim " pincers type induction type integrated digital phase voltammetric meter " literary compositions of the pincers type power-factor meter that in April, 1986, the elegant Wen Anuo company of France put on display in second multinational instrument and meter academic conference of Held in Beijing and exhibition and " electrical measurement and instrument " magazine are introduced all exists voltage phase signal to need to introduce with lead the shortcoming of instrument.The disclosed technology of CNGK 85107511 patent documentations has proposed a kind of simple voltage phase measuring means.But, because the voltage phase signal that tends to there is the interference of many stray electric fields thereby make this method obtain in measuring at the scene can produce certain error.
The objective of the invention is at the above-mentioned defective of obtaining the voltage phase signal method utilize screen method and in case of necessity the method for the interim ground wire of the adjunction non-contact type of realizing having certain antijamming capability obtain the purpose of voltage phase signal.
In existing three-phase system electric power system, exist between arbitrary phase line and the ground one with the identical electric field of this phase line change in voltage rule, also exist the electric field relevant and other some stray electric fields simultaneously with other two phase line change in voltage rules.Therefore be in the nonisulated body of the ground connection in this electric field and all can produce a kind of induction current that is subjected to above-mentioned various electric field influence simultaneously.If make this nonisulated object relatively near the wherein phase line in three phase lines, simultaneously, shielding measure in addition suitably, then can make faradic phase place that this nonisulated body produces to the loop on ground only with the voltage-phase of close phase line relevant.The non-contact type that utilizes this principle just can realize having certain antijamming capability obtains the purpose of voltage phase signal.Concrete principle is seen accompanying drawing.(1) is tested phase line among the figure; (2) the voltage phase signal induction end of making for a kind of conductive material, it can be the nonisulated object of arbitrary shape; (3), (4) are respectively the equivalent input resistance and the electric capacity of voltage phase signal treatment circuit (7); Equivalent stake resistance when (5), (6) are to use the measurement mechanism personnel to make surveying work respectively and electric capacity (8) are the screen layer around the voltage phase signal induction end; (9), (10) are two phase lines beyond the tested phase line; (11) be the temporary grounding lead.Screen layer (8) makes voltage phase signal induction end (2) no longer be subjected to the interference of other two phase lines and other stray electric field.Tested phase line (1) forms an electric capacity with voltage phase signal induction end (2), it makes resistance (3), (5) and electric capacity (4), (6) to the loop on ground, produce a faint electric current, suitably select the size and the profile of voltage phase signal induction end (2), and and tested phase line (1) between distance make tested phase line (1) and voltage phase signal induction end (2) form the capacitive reactance of electric capacity much larger than resistance (3), (5) and electric capacity (4), (6) comprehensive impedance value, then the phase place of this weak current can be than the voltage-phase of tested phase line (1) leading approximately 90 °.The phase signal of this weak current is delivered to voltage phase signal treatment circuit (7) as preliminary voltage phase signal, can obtain the relevant voltage phase signal of voltage-phase after handling with tested phase line (1), voltage phase signal induction end (1) and voltage phase signal treatment circuit apart from each other under certain conditions, then the connection lead between them should have jamming-proof screen layer.Some measure field can make that the formed comprehensive impedance value of equivalent resistance (5) equivalent capacity (6) is bigger than normal, it can make the staff itself who is in the stray electric field respond to upward and the irrelevant interference potential of surveying work, and it will produce the phase signal of above-mentioned weak current and disturb.In this case by temporary ground wire (11) equivalent resistance (5) equivalent capacity (6) shorted to earth, just can eliminate this interference.
The present invention makes people contactlessly realize various measurements relevant with voltage-phase in the electric system with simple method in the environment of certain electric interfering field is arranged.Utilize non-contact voltage phase measuring means of the present invention can make non-contact type power factor (angle) table, non-contact voltage phase meter (or phase-sequence meter) or non-contact type direction of energy flow indicator and other measurement instrument relevant and comprise the multimeter of above-mentioned functions with voltage-phase.
Claims (3)
1, the non-contact voltage phase measuring means that is used for Measurement Phase in the electric instrument.Feature of the present invention is to obtain preliminary voltage phase signal by near the voltage phase signal induction end (2) tested phase line (1), makes voltage phase signal induction end (2) no longer be subjected to the interference of other two phase lines and other stray electric field at voltage phase signal induction end (2) screen layer (8) on every side.Preliminary voltage phase signal is delivered to the relevant voltage phase signal of voltage-phase that obtains after voltage phase signal treatment circuit (7) is handled with tested phase line (1).
2, according to the non-contact voltage phase measuring means of claim 1, it is characterized in that can be by temporary ground wire (1) equivalent resistance (5) equivalent capacity (6) shorted to earth.Disturb with further elimination.
3, use the instrument of non-contact voltage phase measuring means.It is characterized in that: voltage phase signal adopts contactless mode provided by the present invention to obtain.Be applied to power factor (angle) table, voltage-phase table, voltage phase sequence table, direction of energy flow indicator and other measurement instrument relevant with voltage-phase, and comprise the multimeter of above-mentioned functions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87100002 CN87100002A (en) | 1987-01-03 | 1987-01-03 | The acquisition methods of non-contact voltage phase signal and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87100002 CN87100002A (en) | 1987-01-03 | 1987-01-03 | The acquisition methods of non-contact voltage phase signal and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87100002A true CN87100002A (en) | 1988-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87100002 Pending CN87100002A (en) | 1987-01-03 | 1987-01-03 | The acquisition methods of non-contact voltage phase signal and application thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN87100002A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095914A (en) * | 2009-12-11 | 2011-06-15 | 武汉特试特科技有限公司 | Non-contact voltage transducer |
| CN102353840A (en) * | 2011-07-11 | 2012-02-15 | 云南电力试验研究院(集团)有限公司 | Electrostatic induction phase synchronizing method for electric power |
| CN101852823B (en) * | 2010-02-08 | 2012-04-18 | 广东电网公司电力科学研究院 | Non-contact type voltage measuring device and non-contact type voltage measuring method |
-
1987
- 1987-01-03 CN CN 87100002 patent/CN87100002A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095914A (en) * | 2009-12-11 | 2011-06-15 | 武汉特试特科技有限公司 | Non-contact voltage transducer |
| CN101852823B (en) * | 2010-02-08 | 2012-04-18 | 广东电网公司电力科学研究院 | Non-contact type voltage measuring device and non-contact type voltage measuring method |
| CN102353840A (en) * | 2011-07-11 | 2012-02-15 | 云南电力试验研究院(集团)有限公司 | Electrostatic induction phase synchronizing method for electric power |
| CN102353840B (en) * | 2011-07-11 | 2014-09-10 | 云南电力试验研究院(集团)有限公司 | Electrostatic induction phase synchronizing method for electric power |
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