CN202057707U - High impedance frequency conversion voltage divider - Google Patents
High impedance frequency conversion voltage divider Download PDFInfo
- Publication number
- CN202057707U CN202057707U CN2010206852322U CN201020685232U CN202057707U CN 202057707 U CN202057707 U CN 202057707U CN 2010206852322 U CN2010206852322 U CN 2010206852322U CN 201020685232 U CN201020685232 U CN 201020685232U CN 202057707 U CN202057707 U CN 202057707U
- Authority
- CN
- China
- Prior art keywords
- voltage
- voltage divider
- frequency conversion
- high resistance
- active high
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model relates to a high impedance frequency conversion voltage divider, comprising electromagnetic voltage transformers and an active high resistance isolator, wherein the voltage Ui output by a frequency conversion source passes through the electromagnetic voltage transformers, the high voltage output by the secondary side of the electromagnetic voltage transformers is divided by high voltage resistors, the resulted voltage passes through the active high resistance isolator and a lead wire capacitor and is output by the voltage divider gauge outfit, the input end of the active high resistance isolator is connected between high and low arms, and the output end of the active high resistance isolator is connected with the lead wire capacitor. By adding an active high resistance isolator between the high resistance voltage dividing end and the lead wire capacitor, the high impedance frequency conversion voltage divider ensures the voltage Uab on the R2 not to be influenced by frequency change when the voltage Uab passing through the high resistance isolator to the voltage divider gauge outfit via the lead wire capacitor, thereby greatly increasing the accuracy of measurement.
Description
Technical field
The utility model relates to a kind of voltage divider, and the high impedance frequency conversion voltage divider that particularly a kind of output is not influenced by frequency change belongs to the electrical Instrument technology field.
Background technology
General voltage divider has the AC power frequency voltage divider, the AC frequency conversion capacitive divider, divider, alternating current-direct current voltage divider etc., and along with the continuous development of China's power industry, the high-voltage applications field of voltage divider is also very wide, and is being used for the withstand voltage high-tension measurement of electromagnetic potential transformer induction, we carry out high-tension measurement at the method for its no-load voltage ratio estimation of general using, and obviously the error of its measurement is very big; And the utilization of above-mentioned various voltage dividers can't guarantee that also the accuracy of its measurement maybe can't be applied to this type of measurement, the existing principle of work that briefly introduces them respectively in conjunction with its accompanying drawing:
When doing the withstand voltage high-tension measurement of electromagnetic potential transformer 1A induction, because electromagnetic potential transformer inside is made up of coil and iron core, when testing under power frequency, magnetic saturation appears in voltage transformer (VT) easily, so need carry out high-tension measurement by the change frequency.In the above-mentioned method of utilizing its no-load voltage ratio estimation, as Fig. 1,
The voltage of output: Uo=Ui * (N2/N1)/K (K rises coefficient for holding), N2/N1 wherein, the value of K is a probable value, so the voltage U o error of exporting is very big;
Fig. 2 is capacitive AC voltage divider 1B, but when frequency increases, according to I=2 π fCU, C1, C2, C0, last electric current also will increase, and promptly the electric current of voltage transformer secondary side is very big, and the power of general electromagnetic potential transformer is very little, the electromagnetic potential transformer induction is withstand voltage to need three times to do experiment more than the power frequency again, the required reactive current of frequency this moment is quite big, as reducing electric current to reduce electric capacity, when electric capacity is reduced to certain value, lead capacitance is quite big to the influence of measuring voltage, can't use.
Fig. 3 is the conventional, electric-resistance voltage divider:
II＝I2+Ic
＝Uo/R2+Uo/Xc，(Xc＝1/2πfc)
＝Uo×(1/R2+2πfc)
Because R1＞＞R2, I1=Ui/ (R1+R2) can not influence I1 so R2 goes up small variation, therefore I1 can be considered as constant, that is: I1=Uo * (1/R2+2 π fc), when f changed, Uo is change thereupon also.So also there is very big error in the measurement of general resitstance voltage divider.
The utility model content
The utility model purpose is to have proposed the high impedance frequency conversion voltage divider that a kind of output is not influenced by frequency change in order to overcome the deficiencies in the prior art.
For achieving the above object, the technical solution adopted in the utility model is: a kind of high impedance frequency conversion voltage divider, comprise electromagnetic potential transformer, active high-barrier from; Frequency conversion source output voltage U i is through electromagnetic potential transformer, by the high pressure of its secondary side output by after the high-tension resistive dividing potential drop, through active high-barrier from, export through lead capacitance to voltage divider gauge outfit again, described active high-barrier from input end be connected the height pressure arm between, active high-barrier from output terminal be connected with lead capacitance.
Because the utilization of technique scheme, the utility model compared with prior art has following advantage:
High impedance frequency conversion voltage divider of the present utility model, owing between high-tension resistive branch pressure side and lead capacitance, added the active isolation of high resistant, guaranteed R2 go up voltage Uab by high-barrier from during to the voltage divider gauge outfit, not being subjected to the influence of frequency change through lead capacitance, improved the accuracy of measuring greatly.
Description of drawings
Below in conjunction with accompanying drawing technical solutions of the utility model are described further:
The circuit diagram of accompanying drawing 1 for utilizing voltage transformer (VT) no-load voltage ratio estimation algorithm to measure;
The circuit diagram that accompanying drawing 2 is measured for the electric capacity AC potentiometer;
Accompanying drawing 3 is the circuit diagram of conventional, electric-resistance voltage divider;
Accompanying drawing 4 is the circuit diagram of high impedance frequency conversion voltage divider;
Wherein: 1A, electromagnetic potential transformer; 1B, electromagnetic potential transformer; 1C, electromagnetic potential transformer; 1D, electromagnetic potential transformer.
Embodiment
Below in conjunction with accompanying drawing the utility model is described.
Be a kind of high impedance frequency conversion voltage divider described in the utility model as shown in Figure 4, comprise electromagnetic potential transformer 1D, active high-barrier from; Frequency conversion source output voltage U i is through electromagnetic potential transformer, by the high pressure of its secondary side output by after the high-tension resistive dividing potential drop, through active high-barrier from, export through lead capacitance to voltage divider gauge outfit again, described active high-barrier from input end be connected the height pressure arm between, active high-barrier from output terminal be connected with lead capacitance; Like this by high-tension resistive sampling voltage Uab by active high-barrier from through lead capacitance to the voltage divider gauge outfit, I2=I1=UAB/R2, UAB=Uo, and the active high-barrier of the electric current I c on the Co is from power supply, eliminate under different frequency lead capacitance to the influence of sampling voltage Uo, improved the accuracy of measuring greatly.
Because the utilization of technique scheme, the utility model compared with prior art has following advantage:
High impedance frequency conversion voltage divider of the present utility model, owing between high-tension resistive branch pressure side and lead capacitance, added the active isolation of high resistant, guaranteed R2 go up voltage Uab by high-barrier from during to the voltage divider gauge outfit, not being subjected to the influence of frequency change through lead capacitance, improved the accuracy of measuring greatly.
Below only be concrete exemplary applications of the present utility model, protection domain of the present utility model is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, or any to move mode dull and stereotyped described in the utility model, all drop within the utility model rights protection scope.
Claims (1)
1. high impedance frequency conversion voltage divider, comprise electromagnetic potential transformer, active high-barrier from; Frequency conversion source output voltage U i is through electromagnetic potential transformer, by the high pressure of its secondary side output by after the high-tension resistive dividing potential drop, through active high-barrier from, export through lead capacitance to voltage divider gauge outfit again, it is characterized in that: described active high-barrier from input end be connected the height pressure arm between, active high-barrier from output terminal be connected with lead capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206852322U CN202057707U (en) | 2010-12-28 | 2010-12-28 | High impedance frequency conversion voltage divider |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206852322U CN202057707U (en) | 2010-12-28 | 2010-12-28 | High impedance frequency conversion voltage divider |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202057707U true CN202057707U (en) | 2011-11-30 |
Family
ID=45017677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206852322U Expired - Fee Related CN202057707U (en) | 2010-12-28 | 2010-12-28 | High impedance frequency conversion voltage divider |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202057707U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539868A (en) * | 2010-12-28 | 2012-07-04 | 苏州华电电气股份有限公司 | High-impedance variable-frequency voltage divider |
-
2010
- 2010-12-28 CN CN2010206852322U patent/CN202057707U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539868A (en) * | 2010-12-28 | 2012-07-04 | 苏州华电电气股份有限公司 | High-impedance variable-frequency voltage divider |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204214962U (en) | A kind of charger common-mode noise test circuit and proving installation | |
| CN105182126B (en) | Improved distribution transformer energy efficiency metering detection method | |
| CN205103361U (en) | High voltage electric energy metering device detector of working a telephone switchboard | |
| CN102749526B (en) | A kind of method of testing of saturable reactor for direct-current converter valve dynamic inductance | |
| CN101923130B (en) | Special test method for saturable reactor used for converter valve | |
| CN102739066B (en) | Inductive current-to-voltage converter and method for measuring high frequency current | |
| CN202057707U (en) | High impedance frequency conversion voltage divider | |
| CN204464038U (en) | Based on the type three phase combined mutual-inductor that orthogonal coordinate system conversion exports | |
| CN104483570B (en) | A kind of Distribution Network Harmonics improvement method for loss reduction effect reality testing | |
| CN203981796U (en) | Power transmission line power frequency parameter tester with electronic high-induction voltage interference resistance | |
| CN207366721U (en) | A kind of device of simple detection magnetic flux density of silicon steel sheet | |
| CN203312022U (en) | Low-voltage direct-current-resisting current mutual inductor | |
| CN215896145U (en) | Novel voltage AC/DC Rogowski coil | |
| CN202486226U (en) | Source signal parameter estimation device used for detecting transient characteristics of transformer | |
| CN102565581A (en) | Tracing signal parameter estimation method and device for detecting transient characteristics of mutual inductor | |
| CN109839537B (en) | Method for judging harmonic measurement accuracy of transformer substation CVT | |
| CN203894346U (en) | Cable power frequency parameter testing apparatus | |
| CN102539868A (en) | High-impedance variable-frequency voltage divider | |
| CN203607236U (en) | Ultrathin large current mutual inductor | |
| CN201540338U (en) | AC integrated testing device of zinc oxide arrester | |
| CN203745631U (en) | Verifying system for on-line monitoring device of lightning arrester | |
| CN206259912U (en) | A kind of mutual conductance current power amplifier | |
| CN204228830U (en) | A kind of pick-up unit for power distribution network ground capacity | |
| CN106093642B (en) | Capacitance characteristic measuring circuit and its method under a kind of any AC carrier | |
| CN104678185A (en) | Method for measuring power grid ground capacity by capacitance-adjusting type arc suppression coil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111130 Termination date: 20131228 |