CN109557494A - A kind of harmonic measuring device and system based on capacitance type potential transformer - Google Patents
A kind of harmonic measuring device and system based on capacitance type potential transformer Download PDFInfo
- Publication number
- CN109557494A CN109557494A CN201811509169.4A CN201811509169A CN109557494A CN 109557494 A CN109557494 A CN 109557494A CN 201811509169 A CN201811509169 A CN 201811509169A CN 109557494 A CN109557494 A CN 109557494A
- Authority
- CN
- China
- Prior art keywords
- harmonic
- electric current
- current
- capacitance
- voltage
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a kind of harmonic measuring device and system based on capacitance type potential transformer, the harmonic measuring device include the first current transformer, the second current transformer, measurement module；The measurement module is used for: being detected first current transformer and is obtained the first electric current, detects second current transformer and obtain the second electric current；The sum for calculating first electric current and the second electric current obtains flowing through the third electric current of the high-voltage capacitance；Fourier decomposition is carried out to first electric current, obtains each harmonic current components of first electric current, Fourier decomposition is carried out to the third electric current, obtains each harmonic current components of the third electric current；Calculate the harmonic voltage of on high-tension side corresponding number.The present invention crosses the electric current of low-voltage capacitance and CVT transformer side by detection stream, obtains harmonic current by Fourier transformation, and then on high-tension side harmonic voltage is calculated, calculated result is accurate.
Description
Technical field
The present invention relates to technical field of electric power more particularly to a kind of harmonic measuring devices based on capacitance type potential transformer
And system.
Background technique
Recently as the high speed development of large-capacity power electronic equipment, the continuous raising of substation's grid-connected voltage grade,
Due to wherein containing a large amount of inversion rectifier equipments, harmonic wave inevitably is introduced in grid entry point high-pressure side.And it is domestic at present
In external 110kV and the above electric system as secondary side sampling, measurement and protection equipment mutual inductor mainly based on CVT.
The equipment mainly by derided capacitors unit and be similar to electromagnetic potential transformer unit (Potential Transformer,
PT it) forms, package unit is small in size compared with traditional PT, good insulation preformance, price are relatively cheap, it is contemplated that the width of CVT
Frequency transmission characteristic its in harmonic measure precision aspect be far inferior to traditional PT measurement.Specifically, harmonic voltage is transferred to by CVT
It will appear distortion, therefore the harmonic voltage meeting inaccuracy detected in the secondary side of CVT after secondary side.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of harmonic measures based on capacitance type potential transformer
Device and system are crossed the electric current of low-voltage capacitance and CVT transformer side by detection stream, are obtained by Fourier transformation
To harmonic current, and then on high-tension side harmonic voltage is calculated, calculated result is accurate.
A kind of harmonic measuring device based on capacitance type potential transformer, the capacitance type potential transformer include high-voltage electricity
Hold, low-voltage capacitance and intermediate transformer, the both ends of the high-voltage capacitance by conducting wire respectively with high-pressure side and low-voltage capacitance the
One end connection, by wired earth, the both ends of the primary coil of the intermediate transformer pass through the second end of the low-voltage capacitance
Conducting wire respectively with the first end of the low-voltage capacitance and connect, the harmonic measuring device includes the first current transformer, the
Two current transformers, measurement module；First current transformer is used for the conducting wire being set between the low-voltage capacitance and ground
On, second current transformer is used for the conducting wire being set between the primary coil and ground；The measurement module is used for:
It detects first current transformer and obtains the first electric current, detect second current transformer and obtain the second electric current；Meter
The sum for calculating first electric current and the second electric current obtains flowing through the third electric current of the high-voltage capacitance；First electric current is carried out
Fourier decomposition obtains each harmonic current components of first electric current, carries out Fourier decomposition to the third electric current, obtains
To each harmonic current components of the third electric current；According to a certain times harmonic current component of first electric current, third
Electric current corresponds to times harmonic current component, high-voltage electricity capacitance, low tension capacitance, ac frequency, calculates on high-tension side correspondence time
Several harmonic voltages.
In one embodiment, the harmonic voltage U (h) of the h number in the high-pressure side is calculated by following formula:
Wherein, ω1=2 π f1；
Wherein, I1(h) the first electric current h times harmonic electric current, f are indicated1Indicate that ac frequency, j indicate imaginary number list
Position, C1 indicate low tension capacitance, and C2 indicates high-voltage electricity capacitance, and I2 indicates the third electric current h times harmonic electric current.
In one embodiment, the measurement module includes data acquisition unit, and the data acquisition unit is for acquiring
First electric current and the second electric current.
In one embodiment, the measurement module further includes AD conversion unit, and the AD conversion unit is used for will
The first electric current and the second electric current of collected analog signal form are converted to digital signal.
In one embodiment, the measurement module further includes memory, and the memory is for storing the high-pressure side
Correspondence number harmonic voltage
In one embodiment, the memory is SD card, and the measuring unit further includes for being inserted into the SD card
Card slot.
In one embodiment, first current transformer and the second current transformer are forcipated mutual-inductor.
In one embodiment, the measuring unit has communication module, and the communication module is used for the high-pressure side
The harmonic voltage of correspondence number be transmitted to host computer.
In one embodiment, the communication module position usb communication module.
The harmonic measure system based on capacitance type potential transformer that the present invention also provides a kind of is surveyed including the harmonic wave
Device is measured, further includes host computer；The measuring unit has communication module, and the communication module is used for will be described on high-tension side right
The harmonic voltage of number is answered to be transmitted to host computer.
In one embodiment, the harmonic voltage U (h) of the h number in the high-pressure side is calculated by following formula:
Wherein, ω1=2 π f1；
Wherein, I1(h) the first electric current h times harmonic electric current, f are indicated1Indicate that ac frequency, j indicate imaginary number list
Position, C1 indicate low tension capacitance, and C2 indicates high-voltage electricity capacitance, I2(h) the third electric current h times harmonic electric current is indicated.
In one embodiment, the measurement module further includes data acquisition unit, and the data acquisition unit is for adopting
Collect first electric current and the second electric current.
In one embodiment, the measurement module further includes AD conversion unit, and the AD conversion unit is used for will
The first electric current and the second electric current of collected analog signal form are converted to digital signal.
In one embodiment, the measurement module further includes memory, and the memory is for storing the high-pressure side
Correspondence number harmonic voltage.
In one embodiment, the memory is SD card, and the measuring unit further includes for being inserted into the SD card
Card slot.
The utility model has the advantages that
The electric current that low-voltage capacitance and CVT transformer side are crossed by detection stream, is obtained by Fourier transformation
Harmonic current, and then on high-tension side harmonic voltage is calculated, calculated result is accurate.In some embodiments, it may be implemented pair
The accurate detection of 110kV and above transforming plant primary side harmonic voltage size and phase.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
The schematic diagram of the system of Fig. 1 capacitance type potential transformer of the present invention, harmonic measuring device and host computer composition；
Fig. 2 is a kind of planar structure signal of more specifically harmonic measuring device based on capacitance type potential transformer
Figure.
Specific embodiment
Now in conjunction with attached drawing, elaborate to presently preferred embodiments of the present invention.
Fig. 1 is the schematic diagram of the system of capacitance type potential transformer, harmonic measuring device and host computer composition.
The capacitance type potential transformer includes high-voltage capacitance C1, low-voltage capacitance C2, electromagnetic unit L, intermediate transformer T,
The both ends of the high-voltage capacitance C1 are connect with the first end of high-pressure side and low-voltage capacitance C2 respectively by conducting wire, the low-voltage capacitance
The second end of C2 is by wired earth, and one end of the primary coil of the intermediate transformer T is via conducting wire and electromagnetic unit L and institute
State first end connection, the other end connection ground of low-voltage capacitance C2.
The harmonic measuring device 1 includes the first split core type current transformer CT1, the second split core type current transformer CT2, measurement
Module；Conducting wire of the first split core type current transformer CT1 for being set between the low-voltage capacitance and ground, described second
Split core type current transformer CT2 is used for the conducting wire being set between the primary coil and ground.
The measurement module includes: data acquisition unit, AD conversion unit, CPU, memory, communication module.
The data acquisition unit is used to detect the electric current for acquiring that mutual inductance generates on first split core type current transformer, inspection
Survey the electric current for acquiring that mutual inductance generates on second split core type current transformer.
AD conversion unit is used to the electric current that data acquisition unit collects above-mentioned two analog form being converted to correspondence
Digital signal and be transferred to CPU.
CPU calculates separately to obtain the first electric current for flowing through low-voltage capacitance according to the electric current of two digital signal forms, and
Flow through the second electric current of primary coil.
The sum that CPU calculates first electric current and the second electric current obtains flowing through the third electric current of the high-voltage capacitance.
CPU carries out Fourier decomposition to first electric current, obtains each harmonic current components I of first electric current1
(h), usual overtone order from 2 to 50, wherein I1(h) the first electric current h times harmonic electric current is indicated.Specific method can be with
With reference to the calculation method of CN103364604A.
Equally, CPU carries out Fourier decomposition to the third electric current, obtains each harmonic current point of the third electric current
Measure I2(h), wherein I2(h) the third electric current h times harmonic electric current is indicated.
According to a certain times harmonic current component, the third electric current of first electric current correspond to times harmonic current component,
High-voltage electricity capacitance, low tension capacitance, ac frequency calculate the harmonic voltage of on high-tension side corresponding number, especially by as follows
Formula calculates:
Wherein, ω1=2 π f1；
Wherein, f1Indicate that ac frequency, j indicate imaginary unit, C1 indicates low tension capacitance, and C2 indicates high-voltage capacitance
Value.
The memory is used to store the harmonic voltage of the on high-tension side corresponding number, in one embodiment, described
Memory is SD card, and the measuring unit further includes the card slot for being inserted into the SD card, can be extracted SD card when needing, then
Read the harmonic voltage stored in SD card.
The communication module is used to the harmonic voltage of the on high-tension side corresponding number being transmitted to host computer 10.At one
In embodiment, the communication module position usb communication module.In this way, harmonic voltage can be transferred in host computer in real time, thus
The harmonic voltage for monitoring and showing each number in high-pressure side in real time can be realized in host computer 10.
Fig. 2 is a kind of planar structure signal of more specifically harmonic measuring device based on capacitance type potential transformer
Figure, which includes: the direct insertion current channel interface 2 of two-way, power interface 3, SD card slot 4 and USB3.0 interface
5；Wherein, direct insertion current channel interface 2 is used to connect the pincerlike electric current of the first split core type current transformer CT1 and second by conducting wire
Mutual inductor CT2.
It should be understood that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations, to ability
It for field technique personnel, can modify to technical solution illustrated in the above embodiments, or special to part of technology
Sign is equivalently replaced；And all such modifications and replacement, it should all belong to the protection domain of appended claims of the present invention.
Claims (15)
1. a kind of harmonic measuring device based on capacitance type potential transformer, the capacitance type potential transformer include high-voltage electricity
Hold, low-voltage capacitance and intermediate transformer, the both ends of the high-voltage capacitance by conducting wire respectively with high-pressure side and low-voltage capacitance the
One end connection, by wired earth, the both ends of the primary coil of the intermediate transformer pass through the second end of the low-voltage capacitance
Conducting wire respectively with the first end of the low-voltage capacitance and connect, characterized in that
The harmonic measuring device includes the first current transformer, the second current transformer, measurement module；
First current transformer is used for the conducting wire being set between the low-voltage capacitance and ground, second Current Mutual Inductance
Device is used for the conducting wire being set between the primary coil and ground；
The measurement module is used for:
It detects first current transformer and obtains the first electric current, detect second current transformer and obtain the second electricity
Stream；
The sum for calculating first electric current and the second electric current obtains flowing through the third electric current of the high-voltage capacitance；
Fourier decomposition is carried out to first electric current, obtains each harmonic current components of first electric current, to described the
Three electric currents carry out Fourier decomposition, obtain each harmonic current components of the third electric current；
Times harmonic current component, high pressure are corresponded to according to a certain times harmonic current component, the third electric current of first electric current
Capacitance, low tension capacitance, ac frequency calculate the harmonic voltage of on high-tension side corresponding number.
2. harmonic measuring device as described in claim 1, characterized in that
The harmonic voltage U (h) of the h number in the high-pressure side is calculated by following formula:
Wherein, ω1=2 π f1；
Wherein, I1(h) the first electric current h times harmonic electric current, f are indicated1Indicate that ac frequency, j indicate imaginary unit, C1
Indicate low tension capacitance, C2 indicates high-voltage electricity capacitance, and I2 indicates the third electric current h times harmonic electric current.
3. harmonic measuring device as described in claim 1, characterized in that
The measurement module includes data acquisition unit, and the data acquisition unit is for acquiring first electric current and the second electricity
Stream.
4. harmonic measuring device as claimed in claim 3, characterized in that
The measurement module further includes AD conversion unit, and the AD conversion unit is used for collected analog signal form
The first electric current and the second electric current be converted to digital signal.
5. harmonic measuring device as described in claim 1, characterized in that
The measurement module further includes memory, and the memory is used to store the harmonic wave electricity of the on high-tension side corresponding number
Pressure.
6. harmonic measuring device as described in claim 1, characterized in that
The memory is SD card, and the measuring unit further includes the card slot for being inserted into the SD card.
7. harmonic measuring device as described in claim 1, characterized in that
First current transformer and the second current transformer are forcipated mutual-inductor.
8. harmonic measuring device as described in claim 1, characterized in that
The measuring unit has communication module, and the communication module is used for the harmonic voltage of the on high-tension side corresponding number
It is transmitted to host computer.
9. harmonic measuring device as described in claim 1, characterized in that
The communication module position usb communication module.
10. a kind of harmonic measure system based on capacitance type potential transformer, characterized in that including as described in claim 1
Harmonic measuring device further includes host computer；
The measuring unit has communication module, and the communication module is used for the harmonic voltage of the on high-tension side corresponding number
It is transmitted to host computer.
11. harmonic measure system as claimed in claim 10, characterized in that
The harmonic voltage U (h) of the h number in the high-pressure side is calculated by following formula:
Wherein, ω1=2 π f1；
Wherein, I1(h) the first electric current h times harmonic electric current, f are indicated1Indicate that ac frequency, j indicate imaginary unit, C1
Indicate low tension capacitance, C2 indicates high-voltage electricity capacitance, I2(h) the third electric current h times harmonic electric current is indicated.
12. harmonic measure system as described in claim 1, characterized in that
The measurement module further includes data acquisition unit, and the data acquisition unit is for acquiring first electric current and second
Electric current.
13. harmonic measure system as claimed in claim 3, characterized in that
The measurement module further includes AD conversion unit, and the AD conversion unit is used for collected analog signal form
The first electric current and the second electric current be converted to digital signal.
14. harmonic measure system as described in claim 1, characterized in that
The measurement module further includes memory, and the memory is used to store the harmonic wave electricity of the on high-tension side corresponding number
Pressure.
15. harmonic measure system as described in claim 1, characterized in that
The memory is SD card, and the measuring unit further includes the card slot for being inserted into the SD card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811509169.4A CN109557494A (en) | 2018-12-11 | 2018-12-11 | A kind of harmonic measuring device and system based on capacitance type potential transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811509169.4A CN109557494A (en) | 2018-12-11 | 2018-12-11 | A kind of harmonic measuring device and system based on capacitance type potential transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109557494A true CN109557494A (en) | 2019-04-02 |
Family
ID=65869695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811509169.4A Pending CN109557494A (en) | 2018-12-11 | 2018-12-11 | A kind of harmonic measuring device and system based on capacitance type potential transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109557494A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111551886A (en) * | 2020-04-16 | 2020-08-18 | 国网河南省电力公司电力科学研究院 | Harmonic voltage measurement error calculation method and device based on CVT capacitance current |
| CN112130020A (en) * | 2020-09-24 | 2020-12-25 | 中车大同电力机车有限公司 | High-voltage electrical warning method, device, medium and electronic equipment for rolling stock |
| CN115219975A (en) * | 2022-07-07 | 2022-10-21 | 中广核新能源安徽有限公司 | Device and method for measuring and correcting harmonic error of capacitor voltage transformer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201464556U (en) * | 2009-08-31 | 2010-05-12 | 保定天威集团有限公司 | multi-vector harmonic analyzer |
| CN103048637A (en) * | 2012-12-19 | 2013-04-17 | 华北电力大学 | High voltage harmonic test method for CVT broadband characteristics |
| CN103063916A (en) * | 2012-12-19 | 2013-04-24 | 华北电力大学 | CVT Harmonic Test Method Based on Capacitive Current |
| CN103364604A (en) * | 2013-07-30 | 2013-10-23 | 武汉大学 | Capacitor voltage transformer suitable for high-voltage harmonic measurement and measurement method |
| CN203299270U (en) * | 2013-03-07 | 2013-11-20 | 云南电力试验研究院（集团）有限公司电力研究院 | A device for accurately measuring CVT grid side voltage harmonics |
| CN103713183A (en) * | 2012-10-08 | 2014-04-09 | 四川金信石信息技术有限公司 | CVT embedded power-grid voltage harmonic-wave monitoring system |
-
2018
- 2018-12-11 CN CN201811509169.4A patent/CN109557494A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201464556U (en) * | 2009-08-31 | 2010-05-12 | 保定天威集团有限公司 | multi-vector harmonic analyzer |
| CN103713183A (en) * | 2012-10-08 | 2014-04-09 | 四川金信石信息技术有限公司 | CVT embedded power-grid voltage harmonic-wave monitoring system |
| CN103048637A (en) * | 2012-12-19 | 2013-04-17 | 华北电力大学 | High voltage harmonic test method for CVT broadband characteristics |
| CN103063916A (en) * | 2012-12-19 | 2013-04-24 | 华北电力大学 | CVT Harmonic Test Method Based on Capacitive Current |
| CN203299270U (en) * | 2013-03-07 | 2013-11-20 | 云南电力试验研究院（集团）有限公司电力研究院 | A device for accurately measuring CVT grid side voltage harmonics |
| CN103364604A (en) * | 2013-07-30 | 2013-10-23 | 武汉大学 | Capacitor voltage transformer suitable for high-voltage harmonic measurement and measurement method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111551886A (en) * | 2020-04-16 | 2020-08-18 | 国网河南省电力公司电力科学研究院 | Harmonic voltage measurement error calculation method and device based on CVT capacitance current |
| CN111551886B (en) * | 2020-04-16 | 2022-04-22 | 国网河南省电力公司电力科学研究院 | A method and device for calculating harmonic voltage measurement error based on CVT capacitor current |
| CN112130020A (en) * | 2020-09-24 | 2020-12-25 | 中车大同电力机车有限公司 | High-voltage electrical warning method, device, medium and electronic equipment for rolling stock |
| CN115219975A (en) * | 2022-07-07 | 2022-10-21 | 中广核新能源安徽有限公司 | Device and method for measuring and correcting harmonic error of capacitor voltage transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101860080B (en) | Distribution network metering and protection integral device suspended at high-voltage side | |
| CN100592441C (en) | Electronic current transformer for UHV transmission line and its corona loss measuring device | |
| CN103558440B (en) | A kind of intelligent electronic type voltage transformer | |
| CN101271129B (en) | Sensor type high tension electricity energy gauging method | |
| CN101581752B (en) | Power transmission line parameter online measurement method based on fault wave recording | |
| WO2018006876A1 (en) | Capacitive voltage mutual inductor for transient over-voltage monitoring system | |
| CN102737828B (en) | With the capacitance type potential transformer of transient over-voltage monitoring unit | |
| Jensen | Harmonic background amplification in long asymmetrical high voltage cable systems | |
| Huang et al. | Innovative testing and measurement solutions for smart grid | |
| CN102175923A (en) | Transmission line dynamic loss measurement system and method | |
| CN109557494A (en) | A kind of harmonic measuring device and system based on capacitance type potential transformer | |
| CN103323728B (en) | Based on singlephase earth fault and the Xuhanting oral solution recognition methods of whole wave energy Ratios | |
| CN103424627A (en) | Method for measuring zero-sequence impedance of parallel distribution network circuit at double ends | |
| CN202330691U (en) | Field calibrating equipment for voltage transformer | |
| CN101650379A (en) | Combined type sensor | |
| CN201226292Y (en) | Electron type current transformer for ultrahigh voltage transmission line and apparatus for measuring corona loss thereof | |
| CN218848255U (en) | Single-phase charging pile phase line detection system | |
| CN102707139A (en) | Method and device for measuring high-voltage three-phase electric power | |
| CN202042351U (en) | Capacitor voltage transformer component system with transient overvoltage monitoring unit | |
| CN109975736A (en) | A kind of transformer error test macro based on frequency conversion Anti-Jamming Technique in GIS | |
| CN201378184Y (en) | Triphase four-wire system high voltage electric energy meter | |
| CN100549699C (en) | Single Phase Power Transformer | |
| CN204719222U (en) | A kind of portable electronic piece formula current transformer calibration device | |
| CN209728059U (en) | A kind of transformer load loss measuring system | |
| CN203825077U (en) | Large-current collection device for valve side of rectifier transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190402 |