CN205229444U - Capacitance type potential transformer harmonic measurement system - Google Patents
Capacitance type potential transformer harmonic measurement system Download PDFInfo
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- CN205229444U CN205229444U CN201521112485.XU CN201521112485U CN205229444U CN 205229444 U CN205229444 U CN 205229444U CN 201521112485 U CN201521112485 U CN 201521112485U CN 205229444 U CN205229444 U CN 205229444U
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Abstract
The utility model provides a capacitance type potential transformer harmonic measurement system, including capacitive voltage divider, electromagnetic unit, load, voltmeter, transformation ratio correcting unit and signal generator for the measurement, capacitive voltage divider includes high -pressure electric capacity and middling pressure electric capacity, electromagnetic unit global compensation reactor, intermediate transformer and attenuator, the load is including measuring winding load and the load of protection winding, balancing reactor one end is connected between high -pressure electric capacity and middling pressure electric capacity, and intermediate transformer's primary winding is connected to the other end, and intermediate transformer's secondary winding is connected respectively in attenuator, measurement winding load and the load of protection winding, measuring to connect with the input of voltmeter and measuring winding load both ends, transformation ratio correcting unit's first input end is connected to the output, and the correction result of transformation ratio correcting unit's second input, the output of transformation ratio correcting unit output capacitance formula voltage transformer is connected to signal generator's output. The utility model provides a system simple structure, easy to carry out.
Description
Technical field
The utility model relates to power system harmonic measurement field, particularly relates to a kind of capacitance type potential transformer harmonic measure system.
Background technology
In electric system except the conventional harmonic such as generator, power electronic equipment source, the access of the nonlinear-loads such as new forms of energy all may produce a large amount of harmonic waves.Because capacitance type potential transformer inside has a large amount of capacitor and inductor element, therefore under specific frequency, will cause capacitance type potential transformer inside that resonance occurs, thus the actual no-load voltage ratio of capacitance type potential transformer is by offrating.Therefore, clear stipulaties " capacitance type potential transformer can not be used for harmonic measure " in standard GB/T/T " quality of power supply utility network harmonic wave ".
Existing harmonic measuring method mainly includes according to principle classification: theoretical based on Fourier transform, based on Instantaneous Power Theory, based on wavelet transformation theory with based on neural network theory.These harmonic measuring methods all need the instantaneous value to measuring to carry out a large amount of mathematical computations, thus obtain the related datas such as harmonic voltage, harmonic current and relative harmonic content.Because it needs to calculate, so measurement result does not have real-time, therefore have influence on applying of capacitance type potential transformer.
Utility model content
The utility model proposes a kind of capacitance type potential transformer harmonic measure system, solve the problem that capacitance type potential transformer can not be applied to harmonic measure, namely a kind of capacitance type potential transformer with harmonic measurement function is provided.
The utility model provides a kind of capacitance type potential transformer harmonic measure system, comprises capacitive divider, electromagnetic unit, load, measurement voltage table, ratio correction of transformation device and signal generator;
Described capacitive divider comprises high-voltage capacitance C
1with middle voltage capacitance C
2, described electromagnetic unit comprises compensation reactor L
c, intermediate transformer T and damper Z
f, described load comprises measures winding load Z
1with protective winding load Z
2; Compensation reactor L
cone end is connected to high-voltage capacitance C
1with middle voltage capacitance C
2between, the other end connects a winding of intermediate transformer T, damper Z
f, measure winding load Z
1with protective winding load Z
2connect the Secondary Winding of intermediate transformer T respectively; The input end of measurement voltage table is connected to measures winding load Z
1two ends, output terminal connects the first input end of ratio correction of transformation device, and measurement voltage table is from measurement winding load Z
1the capacitance type potential transformer Output rusults access ratio correction of transformation device that two ends gather; The output terminal of signal generator connects the second input end of ratio correction of transformation device, and the harmonic frequency to be measured that signal generator exports is linked into ratio correction of transformation device; The output terminal of ratio correction of transformation device exports the result corrected capacitance type potential transformer Output rusults according to harmonic frequency to be measured and no-load voltage ratio matched curve.
And, carrier frequency thread cast-off circle L is set
dwith portable protective gaps G, middle voltage capacitance C
2through the carrier frequency thread cast-off circle L of parallel connection
dwith portable protective gaps G ground connection.
System architecture that the utility model provides is simple, easy to implement, have revolutionary progressive in hinge structure based on the harmonic measuring method computing method of Fourier transform theory, this device can support that the measurement result realizing capacitance type potential transformer in real time corrects simultaneously.The utility model institute is used to provide system can improve the frequency range of capacitance type potential transformer work, simultaneously can also the investment of survey calculation, the engineer applied scope for raising capacitance type potential transformer is significant.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the utility model embodiment;
Matched curve schematic diagram when Fig. 2 is the work of the utility model embodiment;
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail.
Consider that capacitance type potential transformer is widely used in the voltage measurement of neutral-point solid ground high-pressure system, that current voltage levels system harmonics measures topmost secondary singal source, the utility model proposes the improvement to capacitance type potential transformer, support to correct for capacitance type potential transformer measurement result, directly simple, the measured value of capacitance type potential transformer under harmonic frequency can be obtained exactly.
See Fig. 1, the capacitance type potential transformer harmonic measure system that the utility model provides is adopted and is comprised: capacitive divider is (by high-voltage capacitance C
1with middle voltage capacitance C
2form), electromagnetic unit is (by compensation reactor L
c, intermediate transformer T and damper Z
fform), load is (by measurement winding load Z
1with protective winding load Z
2form), ratio correction of transformation device, signal generator.In addition, G is portable protective gaps, L
dfor carrier frequency thread cast-off circle, V is measurement voltage table.Compensation reactor L
cone end is connected to high-voltage capacitance C
1with middle voltage capacitance C
2between, the other end connects a winding of intermediate transformer T, damper Z
f, measure winding load Z
1with protective winding load Z
2connect the Secondary Winding of intermediate transformer T respectively.The input end of measurement voltage table is connected to measures winding load Z
1two ends, output terminal connects the first input end of ratio correction of transformation device, and measurement voltage table is from measurement winding load Z
1the capacitance type potential transformer Output rusults access ratio correction of transformation device that two ends gather, for gathering and the Output rusults of output capacitance formula voltage transformer (VT).Capacitance type potential transformer high-pressure side is labeled as A, and ground is labeled as N, and dividing point is designated as M.The output terminal of signal generator connects the second input end of ratio correction of transformation device, and the harmonic frequency to be measured that signal generator exports is linked into ratio correction of transformation device.Harmonic frequency to be measured is flowed to ratio correction of transformation device by signal generator, when specifically implementing, can generate corresponding harmonic frequency to be measured according to the overtone order signal received.Ratio correction of transformation device receive that signal generator sends after measured frequency, the Output rusults of no-load voltage ratio matched curve to capacitance type potential transformer according to setting up based on capacitance type potential transformer broadband properties corrects, and output calibration result.
During concrete enforcement, those skilled in the art can preset no-load voltage ratio matched curve voluntarily according to capacitance type potential transformer concrete condition, and carrying out correction according to no-load voltage ratio matched curve to the Output rusults of capacitance type potential transformer can adopt prior art.The utility model only proposes the protection to capacitance type potential transformer harmonic measure system architecture, and this system architecture is sold as novel capacitance type potential transformer product, does not relate to the improvement of software aspect.
For the purpose of the capacitance type potential transformer harmonic measure system reference provided for ease of using the utility model, principle of work is provided to be described as follows:
See the matched curve figure of Fig. 2 capacitance type potential transformer, wherein horizontal ordinate is the logarithm value of frequency, and ordinate carries out calibration with 20lgK, and K is capacitance type potential transformer no-load voltage ratio.High-voltage harmonic source is applied, the voltage (Z of each frequency of secondary side obtained by voltage table V measurement in advance between capacitance type potential transformer high-pressure side A and ground N
1the power supply at two ends) and primary side input voltage (A point current potential) obtain the wideband transport property of capacitance type potential transformer, the ratio of secondary side voltage and primary side voltage is the frequency response characteristic of capacitance type potential transformer no-load voltage ratio.Fitting of a polynomial is carried out to this curve, obtains corresponding fitting function as follows:
Therefore, ratio correction of transformation device can adopt dsp chip to realize, store the fitting function obtained in advance, during the capacitance type potential transformer harmonic measure system works that the utility model provides, the to be measured frequency next according to signal generator transmission is brought in fitting function and obtains no-load voltage ratio corresponding to capacitance type potential transformer, corrects capacitance type potential transformer measurement result.
Visible, the utility model proposes a kind of capacitance type potential transformer with harmonic measurement function, capacitance type potential transformer Output rusults is corrected, make capacitance type potential transformer be applied to harmonic measure.Matching is carried out to capacitance type potential transformer broadband properties, obtains capacitance type potential transformer no-load voltage ratio frequency response curve, adopt fitting of a polynomial to obtain matched curve to this curve.The correction of capacitance type potential transformer measurement result under each frequency is realized based on this curve.The utility model the applicable band of the capacitance type potential transformer that provides system and device to increase substantially wide, realize simple, have more prospect and the meaning of Practical.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present utility model or surmount the scope that appended claims defines.
Claims (2)
1. a capacitance type potential transformer harmonic measure system, is characterized in that: comprise capacitive divider, electromagnetic unit, load, measurement voltage table, ratio correction of transformation device and signal generator;
Described capacitive divider comprises high-voltage capacitance C
1with middle voltage capacitance C
2, described electromagnetic unit comprises compensation reactor L
c, intermediate transformer T and damper Z
f, described load comprises measures winding load Z
1with protective winding load Z
2; Compensation reactor L
cone end is connected to high-voltage capacitance C
1with middle voltage capacitance C
2between, the other end connects a winding of intermediate transformer T, damper Z
f, measure winding load Z
1with protective winding load Z
2connect the Secondary Winding of intermediate transformer T respectively; The input end of measurement voltage table is connected to measures winding load Z
1two ends, output terminal connects the first input end of ratio correction of transformation device, and measurement voltage table is from measurement winding load Z
1the capacitance type potential transformer Output rusults access ratio correction of transformation device that two ends gather; The output terminal of signal generator connects the second input end of ratio correction of transformation device, and the harmonic frequency to be measured that signal generator exports is linked into ratio correction of transformation device; The output terminal of ratio correction of transformation device exports the result corrected capacitance type potential transformer Output rusults according to harmonic frequency to be measured and no-load voltage ratio matched curve.
2. capacitance type potential transformer harmonic measure system according to claim 1, is characterized in that: arrange carrier frequency thread cast-off circle L
dwith portable protective gaps G, middle voltage capacitance C
2through the carrier frequency thread cast-off circle L of parallel connection
dwith portable protective gaps G ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521112485.XU CN205229444U (en) | 2015-12-28 | 2015-12-28 | Capacitance type potential transformer harmonic measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521112485.XU CN205229444U (en) | 2015-12-28 | 2015-12-28 | Capacitance type potential transformer harmonic measurement system |
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| Publication Number | Publication Date |
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| CN205229444U true CN205229444U (en) | 2016-05-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383280A (en) * | 2016-09-06 | 2017-02-08 | 国网新疆电力公司电力科学研究院 | Voltage transformer model test method based on two-node overhead line model |
| CN107643502A (en) * | 2017-09-26 | 2018-01-30 | 广西电网有限责任公司电力科学研究院 | A kind of high-voltage electrical apparatus detecting instrument check device |
| CN108535679A (en) * | 2018-03-15 | 2018-09-14 | 广东电网有限责任公司东莞供电局 | Capacitance type potential transformer harmonic voltage based on interpolation method accurately measures method |
| CN110471020A (en) * | 2019-08-26 | 2019-11-19 | 云南电网有限责任公司曲靖供电局 | A kind of capacitance type potential transformer monitoring device with self diagnosis |
| CN112131798A (en) * | 2020-09-29 | 2020-12-25 | 西安热工研究院有限公司 | CVT primary side voltage signal recovery method based on BP neural network |
-
2015
- 2015-12-28 CN CN201521112485.XU patent/CN205229444U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383280A (en) * | 2016-09-06 | 2017-02-08 | 国网新疆电力公司电力科学研究院 | Voltage transformer model test method based on two-node overhead line model |
| CN106383280B (en) * | 2016-09-06 | 2019-02-05 | 国网新疆电力公司电力科学研究院 | The voltage transformer Model test Method of line model is maked somebody a mere figurehead based on two nodes |
| CN107643502A (en) * | 2017-09-26 | 2018-01-30 | 广西电网有限责任公司电力科学研究院 | A kind of high-voltage electrical apparatus detecting instrument check device |
| CN108535679A (en) * | 2018-03-15 | 2018-09-14 | 广东电网有限责任公司东莞供电局 | Capacitance type potential transformer harmonic voltage based on interpolation method accurately measures method |
| CN110471020A (en) * | 2019-08-26 | 2019-11-19 | 云南电网有限责任公司曲靖供电局 | A kind of capacitance type potential transformer monitoring device with self diagnosis |
| CN112131798A (en) * | 2020-09-29 | 2020-12-25 | 西安热工研究院有限公司 | CVT primary side voltage signal recovery method based on BP neural network |
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