CN111141943A - A broadband voltage transformer suitable for power electronic equipment - Google Patents
A broadband voltage transformer suitable for power electronic equipment Download PDFInfo
- Publication number
- CN111141943A CN111141943A CN202010024322.5A CN202010024322A CN111141943A CN 111141943 A CN111141943 A CN 111141943A CN 202010024322 A CN202010024322 A CN 202010024322A CN 111141943 A CN111141943 A CN 111141943A
- Authority
- CN
- China
- Prior art keywords
- electrode
- shielding
- power electronic
- electronic equipment
- measuring
- 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
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
本发明提供一种宽频电压互感器，固定于电力电子设备的屏蔽罩(5)上，其包括贴片底板、测量电极(1)和屏蔽电极(2)；屏蔽电极(2)为环形结构，所述测量电极(1)位于屏蔽电极(2)内部，所述测量电极(1)和屏蔽电极(2)均固定于贴片底板上，且所述测量电极(1)与屏蔽电极(2)之间不接触，环境适应性强，且能够实现宽频电压的测量；本发明提供的宽频电压互感器能够对电力电子设备的电位分布和暂态电压进行直接测量，且不会改变电力电子设备的电位分布，为非侵入式，不包含发热元件，对环境温度不敏感，环境适应性强；本发明提供的宽频电压互感器结构简单，纵向尺寸、体积和重量显著降低，安装方便，能够适用于电力电子设备。
The invention provides a broadband voltage transformer, which is fixed on a shielding cover (5) of a power electronic device, and comprises a patch base plate, a measuring electrode (1) and a shielding electrode (2); the shielding electrode (2) is a ring-shaped structure, The measuring electrode (1) is located inside the shielding electrode (2), the measuring electrode (1) and the shielding electrode (2) are both fixed on the patch base plate, and the measuring electrode (1) and the shielding electrode (2) There is no contact between them, the environmental adaptability is strong, and the broadband voltage measurement can be realized; the broadband voltage transformer provided by the present invention can directly measure the potential distribution and transient voltage of the power electronic equipment, and will not change the power electronic equipment. Potential distribution is non-intrusive, does not contain heating elements, is insensitive to ambient temperature, and has strong environmental adaptability; the broadband voltage transformer provided by the present invention has a simple structure, the longitudinal size, volume and weight are significantly reduced, easy to install, and can be applied to Power electronic equipment.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a broadband voltage transformer suitable for power electronic equipment.
Background
Power electronic equipment such as a converter valve, a direct-current high-voltage circuit breaker and the like is composed of components such as a power electronic device, a voltage-sharing capacitor, a lightning arrester and the like, in the design process, accurate calculation needs to be carried out on overvoltage and insulation matching, and the more uniform the voltage drop of each component is, the higher the reliability of the power electronic equipment is. In the operation process, the potential distribution of the power electronic equipment is changed due to the difference of the electrical elements or damage of the electrical elements in the operation process, the reliability of the power electronic equipment is affected, and the transient voltage of the power electronic equipment needs to be monitored.
The existing voltage transformer generally adopts a resistance voltage divider, a resistance-capacitance voltage divider or a capacitance voltage divider; 1) for the resistance voltage divider and the resistance-capacitance voltage divider, because the resistance of the resistance voltage divider is larger, the capacitance of the resistance-capacitance voltage divider is larger, the potential distribution of the power electronic equipment can be changed after the resistance-capacitance voltage divider and the resistance-capacitance voltage divider are connected into the power electronic equipment, and the resistance voltage divider/the resistance-capacitance voltage divider formed by the entity resistance/capacitance has larger longitudinal size and volume, is easy to heat and has poor environmental adaptability; 2) capacitive voltage divider comprises the high-voltage arm electric capacity and the low-voltage arm electric capacity of establishing ties, because high-voltage arm electric capacity appearance value is great, generally at several hundred to several thousand pF, inserts capacitive voltage divider and can change the potential distribution of power electronic equipment body, and simultaneously, capacitive voltage divider transient state performance is alternately, is difficult to realize the measurement of wide band voltage.
Disclosure of Invention
In order to overcome the defects of poor environmental adaptability and difficulty in realizing measurement of broadband voltage in the prior art, the invention provides a broadband voltage transformer applicable to power electronic equipment, which is fixed on a shielding case (5) of the power electronic equipment and comprises a patch bottom plate, a measuring electrode (1) and a shielding electrode (2); shielding electrode (2) are the loop configuration, and measuring electrode (1) is located inside shielding electrode (2), measuring electrode (1) and shielding electrode (2) all are fixed in on the paster bottom plate, just contactless between measuring electrode (1) and shielding electrode (2), and the mutual-inductor is used for realizing the measurement of power electronic equipment wide band voltage based on measuring electrode (1) and shielding electrode (2) respective stray capacitance to ground, and environmental suitability is strong, and can realize the measurement of wide band voltage.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the invention provides a broadband voltage transformer applicable to power electronic equipment, which is fixed on a shielding case (5) of the power electronic equipment and comprises a patch bottom plate, a measuring electrode (1) and a shielding electrode (2);
the shielding electrode (2) is of an annular structure, the measuring electrode (1) is positioned inside the shielding electrode (2), the measuring electrode (1) and the shielding electrode (2) are both fixed on the patch bottom plate, and the measuring electrode (1) is not in contact with the shielding electrode (2);
the mutual inductor is used for measuring the broadband voltage of the power electronic equipment based on the stray capacitance to the ground of the measuring electrode (1) and the shielding electrode (2).
The patch bottom plate comprises an insulating bottom plate (3) and a metal bottom plate (4);
the upper part of the metal bottom plate (4) is fixed with the insulating bottom plate (3), and the lower part of the metal bottom plate is fixed with a shielding case (5) of the power electronic equipment.
The thickness of the shielding electrode (2) is larger than that of the measuring electrode (1);
the measuring electrode (1) and the shielding electrode (2) are identical in shape and are circular, oval or square with chamfers.
The total thickness of the insulating bottom plate (3) and the metal bottom plate (4) is not more than 2 cm;
the insulating bottom plate (3) and the metal bottom plate (4) are the same in shape and are circular, oval or square with chamfers.
The device also comprises a measuring capacitor C, a resonance elimination resistor R, a first shielding lead (7) and a second shielding lead (8);
one end of the resonance elimination resistor R is connected with the measuring electrode (1) through a first shielding lead (7), the other end of the resonance elimination resistor R is connected with the positive electrode of the measuring capacitor C, and the negative electrode of the measuring capacitor C is connected with the shielding electrode (2) through a second shielding lead (8).
The device also comprises a signal output board (6);
and the measuring capacitor C and the resonance elimination resistor R are both fixed on the signal output board (6).
The measuring electrode (1) and the shielding electrode (2) are made of metal.
The insulating bottom plate (3) is made of epoxy resin;
the metal bottom plate (4) is made of copper or aluminum.
The measuring electrode (1) and the insulating bottom plate (3), the shielding electrode (2) and the insulating bottom plate (3) and the metal bottom plate (4) are fixed through adhesives or fixing pieces;
the metal bottom plate (4) and the shielding cover (5) are fixed through permanent magnet adsorption or fasteners.
The capacitance values of the stray capacitance to ground of the shielding electrode (2) and the stray capacitance to ground of the measuring electrode (1) meet the following condition:
Ca/Cb＝Cm/Cs
wherein, CaFor the capacitance value, C, of a matching capacitor provided in the shield branchbIs the capacitance value of the stray capacitance to ground, C, of the shielding electrode (2)mFor measuring the capacitance of a measuring capacitor in a branch, CsThe capacitance value of the stray capacitance to the ground of the electrode (1) is measured.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
the invention provides a broadband voltage transformer, which comprises a patch bottom plate, a measuring electrode (1) and a shielding electrode (2); the shielding electrode (2) is of an annular structure, the measuring electrode (1) is located inside the shielding electrode (2), the measuring electrode (1) and the shielding electrode (2) are fixed on the patch bottom plate, the measuring electrode (1) is not in contact with the shielding electrode (2), the mutual inductor is used for measuring the broadband voltage of the power electronic equipment based on the respective stray capacitance to the ground of the measuring electrode (1) and the shielding electrode (2), the environmental adaptability is high, and the measurement of the broadband voltage can be realized;
the broadband voltage transformer provided by the invention can directly measure the potential distribution and the transient voltage of the power electronic equipment, does not change the potential distribution of the power electronic equipment, is non-invasive, does not contain a heating element, is not sensitive to the ambient temperature and has strong environmental adaptability;
the broadband voltage transformer provided by the invention has the advantages of simple structure, obviously reduced longitudinal size, volume and weight, convenience in installation and suitability for power electronic equipment.
Drawings
FIG. 1 is a diagram of a broadband voltage transformer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a broadband voltage transformer installation according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a broadband voltage transformer in an embodiment of the invention;
in the figure, 1-the measuring electrode, 2-the shielding electrode, 3-the insulating substrate, 4-the metal substrate, 5-the shielding can, 6-the signal output board, 7-the first shielding lead, 8-the second shielding lead.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the invention provides a broadband voltage transformer applicable to power electronic equipment, which is fixed on a shielding case 5 of the power electronic equipment as shown in fig. 1, and comprises a patch bottom plate, a measuring electrode 1 and a shielding electrode 2;
the shielding electrode 2 is of an annular structure, the measuring electrode 1 is positioned inside the shielding electrode 2, the measuring electrode 1 and the shielding electrode 2 are both fixed on the patch bottom plate, and the measuring electrode 2 is not in contact with the shielding electrode 2;
the mutual inductor is used for measuring the broadband voltage of the power electronic equipment based on the stray capacitance to the ground of each of the measuring electrode 1 and the shielding electrode 2.
The shielding electrode 2 is used for protecting the measuring electrode 1, and the influence of the conducting bodies around the power electronic equipment on the measuring precision of the mutual inductor is avoided.
As shown in fig. 2, the patch panel includes an insulating panel 3 and a metal panel 4;
the metal base plate 4 is fixed to the insulating base plate 3 at its upper portion and to the shield case 5 of the power electronic device at its lower portion.
The thickness of the shielding electrode 2 is larger than that of the measuring electrode 1;
the measuring electrode 1 and the shielding electrode 2 are the same in shape and are all round, oval or square with chamfers.
The total thickness of the insulating base plate 3 and the metal base plate 4 is not more than 2cm, and the influence on the distribution of an external electric field of the power electronic equipment assembly is avoided.
The insulating bottom plate 3 and the metal bottom plate 4 are the same in shape, both are circular, oval or square with chamfers, and the area of the insulating bottom plate 3 is larger than that of the shielding electrode 2.
The broadband voltage transformer provided by the embodiment of the invention further comprises a measuring capacitor C, a resonance elimination resistor R, a first shielding lead 7 and a second shielding lead 8;
one end of the resonance elimination resistor R is connected with the measuring electrode 1 through a first shielding lead 7, the other end of the resonance elimination resistor R is connected with the anode of the measuring capacitor C, and the cathode of the measuring capacitor C is connected with the shielding electrode 2 through a second shielding lead 8.
The broadband voltage transformer provided by the embodiment of the invention also comprises a signal output plate 6; the measuring capacitor C and the resonance elimination resistor R are both fixed on the signal output plate 6.
The measuring electrode 1 and the shielding electrode 2 are made of metal. The insulating bottom plate 3 is made of epoxy resin; the metal base plate 4 is made of copper or aluminum.
The measuring electrode 1 and the insulating bottom plate 3, the shielding electrode 2 and the insulating bottom plate 3, and the insulating bottom plate 3 and the metal bottom plate 4 are fixed through adhesives or fixing pieces;
the metal bottom plate 4 and the shielding case 5 are fixed by permanent magnet adsorption or fasteners.
In the embodiment of the invention, the capacitance value of the measuring electrode 1 to the ground stray capacitance is not too large and is not more than 1PF, for example, a circular measuring electrode with the diameter of 300mm is taken as an example, after the height of the measuring electrode from the ground is more than 5 meters, the ground stray capacitance is basically stabilized at about 0.4PF, if the installation height is 1m away from the calculation distance, the caused transformation ratio error is about 0.4%, and meanwhile, the smaller capacitance basically does not influence the original potential distribution of the power electronic equipment.
The working principle of the broadband voltage transformer provided by the embodiment of the invention is shown in fig. 3, wherein the interelectrode capacitance between the measuring electrode 1 and the shielding electrode 2 is Cr(ii) a The capacitance value of the stray capacitance to ground of the measuring electrode 1 is CsThe capacitance value of the stray capacitance to ground of the shield electrode 2 is CbThe capacitance value of the matching capacitor arranged in the shielding branch is CaAssuming that the capacitance value of the measuring capacitor in the measuring branch is CmThe stray capacitance to ground of the measuring electrode 1 is connected in series with the measuring capacitance in the measuring branch circuit to form a measuring branch circuit, the stray capacitance to ground of the shielding electrode 2 is connected in series with the matching capacitance to form a shielding branch circuit, and C is satisfied between the stray capacitance to ground of the shielding electrode 2 and the respective capacitance values of the stray capacitance to ground of the measuring electrode 1a/Cb＝Cm/Cs. Due to the protection of the shielding branch, the stray capacitance to the ground of the measuring electrode 1 is under the protection of equipotential shielding, and the stray capacitance between the surrounding charged body and the capacitance voltage divider only affects the value of the matching capacitance (since the capacitance between the adjacent conductor and the shielding case is generally PF level, and the matching capacitance is generally nF level, the conversion of the matching capacitance is also extremely small), and the stray capacitance to the ground of the measuring electrode 1 is not affected, thereby ensuring the stability of the stray capacitance to the ground of the measuring electrode 1.
By measuring the capacitance C of the capacitormThe high-voltage side voltage of the broadband voltage transformer can be obtained, and the voltage division ratio is as follows:
U1for measuring the voltage of the capacitor, U0The high-voltage side voltage of the broadband voltage transformer is obtained. In order to avoid the stray capacitance to the ground of the measuring electrode 1, the measuring capacitor and the high-voltage lead wire from being connected in series, the measuring branch is added with a harmonic elimination resistor, and in order to keep the transformation ratio inconvenient, the harmonic elimination resistor is divided into R1 and R2, R2/R1 is Cm/Cs。
According to the embodiment of the invention, the stray capacitance of the measuring electrode 1 to the ground is utilized to form the high-voltage arm of the broadband voltage transformer, the stray capacitance to the ground and the entity capacitor are connected in series, the potential distribution of the power electronic equipment can be accurately and directly measured, the potential distribution condition of the power electronic equipment is not changed due to the extremely small stray capacitance of the measuring electrode 1 to the ground, and the broadband voltage transformer has the characteristics of stable voltage division ratio, good transient response and the like.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware when implementing the present application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalent substitutions to the specific embodiments of the present invention with reference to the above embodiments, and any modifications or equivalent substitutions which do not depart from the spirit and scope of the present invention are within the protection scope of the present invention as claimed in the appended claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010024322.5A CN111141943A (en) | 2020-01-10 | 2020-01-10 | A broadband voltage transformer suitable for power electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010024322.5A CN111141943A (en) | 2020-01-10 | 2020-01-10 | A broadband voltage transformer suitable for power electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111141943A true CN111141943A (en) | 2020-05-12 |
Family
ID=70524247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010024322.5A Pending CN111141943A (en) | 2020-01-10 | 2020-01-10 | A broadband voltage transformer suitable for power electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111141943A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113960355A (en) * | 2021-10-21 | 2022-01-21 | 国网江苏省电力有限公司电力科学研究院 | Broadband voltage monitoring device based on non-contact sensor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2689243Y (en) * | 2004-04-20 | 2005-03-30 | 西安高研电器有限责任公司 | Electronic voltage sensor with double shielding electode |
| CN101201366A (en) * | 2007-11-02 | 2008-06-18 | 桂林电力电容器有限责任公司 | Whole shielding capacitor voltage transformer |
| CN101819868A (en) * | 2010-05-04 | 2010-09-01 | 中国电力科学研究院 | Extra-high-voltage equal potential shielded capacitor voltage transformer |
| CN204044216U (en) * | 2014-09-05 | 2014-12-24 | 镇江市丹高电器有限公司 | Electronic voltage transformer for digitalized power substation |
| CN106872752A (en) * | 2015-12-14 | 2017-06-20 | 全球能源互联网研究院 | A kind of capacitance type potential transformer |
-
2020
- 2020-01-10 CN CN202010024322.5A patent/CN111141943A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2689243Y (en) * | 2004-04-20 | 2005-03-30 | 西安高研电器有限责任公司 | Electronic voltage sensor with double shielding electode |
| CN101201366A (en) * | 2007-11-02 | 2008-06-18 | 桂林电力电容器有限责任公司 | Whole shielding capacitor voltage transformer |
| CN101819868A (en) * | 2010-05-04 | 2010-09-01 | 中国电力科学研究院 | Extra-high-voltage equal potential shielded capacitor voltage transformer |
| CN204044216U (en) * | 2014-09-05 | 2014-12-24 | 镇江市丹高电器有限公司 | Electronic voltage transformer for digitalized power substation |
| CN106872752A (en) * | 2015-12-14 | 2017-06-20 | 全球能源互联网研究院 | A kind of capacitance type potential transformer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113960355A (en) * | 2021-10-21 | 2022-01-21 | 国网江苏省电力有限公司电力科学研究院 | Broadband voltage monitoring device based on non-contact sensor |
| CN113960355B (en) * | 2021-10-21 | 2024-05-17 | 国网江苏省电力有限公司电力科学研究院 | Broadband voltage monitoring device based on non-contact sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103217571B (en) | Differential type D-dot voltage transformer and voltage detecting method thereof | |
| Fu et al. | Current measurement method of multiple chips using rectangular PCB Rogowski coils integrated in press pack IGBT device | |
| CN102944716A (en) | Lightning flow sensor of Rogowski coil based on printed circuit board | |
| CN106771505A (en) | Single-phase overhead transmission line of electricity phase voltage method for self-calibrating based on series capacitance | |
| CN106970268B (en) | Phase voltage self-calibration method of single-phase overhead transmission line based on parallel capacitor | |
| CN103728582A (en) | Capacitive voltage divider and intermediate voltage measurement method applied to electrified calibration | |
| CN103777055B (en) | The outer integrator sensor of multiple Luo-coil parallel connection | |
| CN111141943A (en) | A broadband voltage transformer suitable for power electronic equipment | |
| CN204177837U (en) | A kind of novel fully-sealed electromagnetic screen impedance box | |
| CN203630174U (en) | High precision capacitive voltage divider applied in live-line verification | |
| CN102305883A (en) | High-voltage electric energy metering device | |
| CN114545057A (en) | System and method for expanding Rogowski coil current sensor measurement bandwidth | |
| CN111679117B (en) | A broadband 35kv voltage measuring device and method | |
| CN119861325A (en) | Broadband standard voltage transformer for measuring errors of harmonic transformers | |
| CN104267235B (en) | A kind of annular voltage sensing device | |
| CN206573623U (en) | High-voltage alternating standard voltage divider | |
| CN108183027B (en) | Programmable vitreous silica standard capacitor | |
| CN205484539U (en) | Measuring System of Resistive Current of Metal Oxide Surge Arrester | |
| CN214845416U (en) | Resistance unit structure and voltage divider | |
| CN213875794U (en) | Novel voltage sensor anti-electric field interference | |
| CN203561668U (en) | Coupling capacitance voltage divider with potential gradient shielding | |
| Modarres et al. | Design and implementation of a resistive MV voltage divider | |
| CN112327022A (en) | Novel voltage sensor anti-electric field interference | |
| CN111141942A (en) | Inverted broadband voltage transformer | |
| CN2901529Y (en) | Electronic voltage mutual inductor |
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 |