CN112180162A - Harmonic detection system based on capacitive voltage transformer - Google Patents
Harmonic detection system based on capacitive voltage transformer Download PDFInfo
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- CN112180162A CN112180162A CN202011030183.3A CN202011030183A CN112180162A CN 112180162 A CN112180162 A CN 112180162A CN 202011030183 A CN202011030183 A CN 202011030183A CN 112180162 A CN112180162 A CN 112180162A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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Abstract
The invention relates to a harmonic detection system based on a capacitor voltage transformer.A capacitive voltage divider of the capacitor voltage transformer is provided with an outer porcelain sleeve, a high-voltage capacitor and a medium-voltage capacitor are arranged in the outer porcelain sleeve, and the high-voltage capacitor is connected with a low-voltage capacitor in series; the method is characterized in that: the harmonic detection capacitor is included; a harmonic detection capacitor is connected in series between a low-voltage end and a grounding end of a capacitive voltage divider of a conventional capacitive voltage transformer, the harmonic detection capacitor is connected in series with a high-voltage capacitor and a medium-voltage capacitor in a high-strength porcelain bushing to form a voltage dividing circuit, a power grid harmonic measurement signal is obtained by utilizing a capacitive voltage dividing principle, and the harmonic signal measurement function is achieved on the basis of meeting the power frequency signal measurement accuracy.
Description
Technical Field
The invention relates to the technical field of harmonic detection of a capacitor voltage transformer, in particular to a harmonic detection system based on the capacitor voltage transformer.
Background
Fig. 1 is a circuit connection diagram of a conventional capacitor voltage transformer for detecting harmonic waves; if a conventional CVT is required for harmonic measurement, the electromagnetic unit needs to be disconnected, so that the capacitor voltage transformer becomes a pure capacitive divider, which can result in the capacitor voltage transformer being unable to be used in a conventional manner. The capacitive voltage divider of the conventional capacitive voltage transformer can resonate in the capacitive voltage transformer under the condition of harmonic waves, so that the transmission of the harmonic waves by the capacitive voltage transformer is distorted, and the error can reach 80-1200%; conventional capacitive voltage transformers cannot be used for harmonic measurement.
Disclosure of Invention
The invention aims to provide a harmonic detection system based on a capacitor voltage transformer, which can solve the problem of harmonic detection of the conventional capacitor voltage transformer.
In order to solve the technical problems, the technical scheme of the invention is as follows: a harmonic detection system based on a capacitor voltage transformer is characterized in that a capacitive voltage divider of the capacitor voltage transformer is provided with an outer porcelain sleeve, a high-voltage capacitor and a medium-voltage capacitor are arranged in the outer porcelain sleeve, and the high-voltage capacitor is connected with the medium-voltage capacitor in series; the innovation points are as follows:
the harmonic detection capacitor is connected in series with the medium-voltage capacitor and is positioned inside a porcelain sleeve outside a capacitive voltage divider of the capacitive voltage transformer; the output end of the harmonic detection capacitor is the low-voltage end of a capacitive voltage divider of the capacitive voltage transformer; an electromagnetic unit circuit is connected in parallel with a connecting line between the harmonic detection capacitor and the medium-voltage capacitor, and the input end of the electromagnetic unit circuit is the low-voltage end of the electromagnetic unit circuit; a harmonic detector is connected between the low-voltage end of the capacitor voltage transformer and the low-voltage end of the electromagnetic unit circuit to realize the harmonic detection of the capacitor voltage transformer;
a film paper composite medium is adopted between the polar plates of the harmonic detection capacitor;
the electromagnetic unit circuit comprises a compensation reactor and an intermediate transformer; the compensation reactor is connected in series with the low-voltage end of the electromagnetic unit circuit, and a primary winding and a plurality of secondary winding terminals are respectively arranged on two sides of the intermediate transformer; the input end of the primary winding is connected to a line between the high-voltage capacitor and the medium-voltage capacitor in series through a lead; and the output end of the primary winding is connected with the input end of the compensation reactor.
Furthermore, the high-voltage capacitor and the medium-voltage capacitor are formed by connecting a plurality of elements in series, and the harmonic detection capacitor is formed by connecting a plurality of elements in parallel; and the harmonic detection capacitor is fastened by adopting an insulating plate in a mechanical fixing mode.
Furthermore, a damper is connected in parallel to one of the secondary winding terminals on one side of the intermediate transformer.
Furthermore, a first protection gap wiring end is arranged on the compensation reactor, a second protection gap wiring end is connected to the compensation reactor through a wire, a protection resistor is arranged on the wire, and a protection gap is arranged between the first protection gap wiring end and the second protection gap wiring end.
The invention has the advantages that:
1) according to the invention, a harmonic detection capacitor is connected in series between the low-voltage end and the grounding end of a capacitive voltage divider of a conventional capacitive voltage transformer, the harmonic detection capacitor is connected in series with a high-voltage capacitor and a medium-voltage capacitor in a high-strength porcelain bushing to form a voltage dividing circuit, and a power grid harmonic measurement signal is obtained by using a capacitive voltage dividing principle, so that the harmonic signal measurement function is achieved on the basis of meeting the power frequency signal measurement accuracy.
2) The harmonic detection capacitor adopts the membrane paper composite medium, so that the influence of the ambient temperature on the harmonic measurement voltage is reduced, the harmonic measurement voltage is ensured to be stable, and the harmonic measurement is maintained at higher precision; the capacitor element of the harmonic measurement capacitor is arranged in the porcelain bushing together with the high-voltage capacitor and the medium-voltage capacitor, so that the influence of the environment on the performance and the service life of the harmonic measurement capacitor due to the external arrangement is avoided.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of a capacitor voltage transformer.
Fig. 2 is a structural diagram of a capacitive voltage transformer of a harmonic detection system of the capacitive voltage transformer according to the present invention.
Fig. 3 is an electrical schematic diagram of a harmonic detection system of a capacitive voltage transformer according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 2 to fig. 3, a capacitive voltage transformer based harmonic detection system includes an outer porcelain bushing 1, a high voltage capacitor 2 and a medium voltage capacitor 3 disposed inside the outer porcelain bushing 1, and the high voltage capacitor 2 is connected in series with the medium voltage capacitor 3.
The harmonic detection capacitor 4 is connected in series with the medium-voltage capacitor 3 and is positioned inside the porcelain sleeve 1 outside the capacitive voltage divider of the capacitive voltage transformer; the output end of the harmonic detection capacitor 4 is the low-voltage end of the capacitor voltage transformer; an electromagnetic unit circuit 5 is connected in parallel on a connecting line between the harmonic detection capacitor 4 and the medium-voltage capacitor, and the input end of the electromagnetic unit circuit 5 is the low-voltage end of the electromagnetic unit circuit; and a harmonic detector is connected between the low-voltage end of the capacitor voltage transformer and the low-voltage end of the electromagnetic unit circuit to realize the harmonic detection of the capacitor voltage transformer.
And a film paper composite medium is adopted between the polar plates of the harmonic detection capacitor 4.
The electromagnetic unit circuit 5 includes a compensation reactor 51 and an intermediate transformer 52; the compensation reactor 51 is connected in series with the low-voltage end of the electromagnetic unit circuit 5, and the two sides of the intermediate transformer 52 are respectively a primary winding and a plurality of secondary winding terminals; the input end of the primary winding is connected with a line between the high-voltage capacitor 2 and the medium-voltage capacitor 3 in series through a lead; the output of the primary winding is connected to the input of a compensation reactor 51.
The high-voltage capacitor 2 and the medium-voltage capacitor 3 are formed by connecting a plurality of elements in series, and the harmonic detection capacitor 4 is formed by connecting a plurality of elements in parallel; the harmonic detection capacitor 4 is fastened by adopting an insulating plate in a mechanical fixing mode, so that the capacitance change caused by vibration or the self weight of elements in the transportation process is prevented.
The damper 6 is connected in parallel to one of the secondary winding terminals on one side of the intermediate transformer 52.
A first protection gap terminal is arranged on the compensation reactor 51, a second protection gap terminal is connected to the compensation reactor 51 through a lead, a protection resistor 7 is arranged on the lead, and a protection gap is arranged between the first protection gap terminal and the second protection gap terminal.
The working principle of the invention is as follows: a harmonic measurement capacitor for measuring harmonic is arranged between a low-voltage terminal and a grounding terminal of the capacitor voltage transformer, voltage signals are obtained from two ends of the harmonic measurement capacitor, output signals are sent to a grounding module through a shielded cable, and the grounding module simultaneously collects harmonic measurement signals of the three-phase electrodynamic voltage transformer.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A harmonic detection system based on a capacitor voltage transformer is characterized in that a capacitive voltage divider of the capacitor voltage transformer is provided with an outer porcelain sleeve, a high-voltage capacitor and a medium-voltage capacitor are arranged in the outer porcelain sleeve, and the high-voltage capacitor is connected with the medium-voltage capacitor in series; the method is characterized in that:
the harmonic detection capacitor is connected in series with the medium-voltage capacitor and is positioned inside a porcelain sleeve outside a capacitive voltage divider of the capacitive voltage transformer; the output end of the harmonic detection capacitor is the low-voltage end of a capacitive voltage divider of the capacitive voltage transformer; an electromagnetic unit circuit is connected in parallel with a connecting line between the harmonic detection capacitor and the medium-voltage capacitor, and the input end of the electromagnetic unit circuit is the low-voltage end of the electromagnetic unit circuit; a harmonic detector is connected between the low-voltage end of a capacitive voltage divider of the capacitive voltage transformer and the low-voltage end of the electromagnetic unit circuit to realize harmonic detection of the capacitive voltage transformer;
a film paper composite medium is adopted between the polar plates of the harmonic detection capacitor;
the electromagnetic unit circuit comprises a compensation reactor and an intermediate transformer; the compensation reactor is connected in series with the low-voltage end of the electromagnetic unit circuit, and a primary winding and a plurality of secondary winding terminals are respectively arranged on two sides of the intermediate transformer; the input end of the primary winding is connected to a line between the high-voltage capacitor and the medium-voltage capacitor in series through a lead; and the output end of the primary winding is connected with the input end of the compensation reactor.
2. The harmonic detection system based on the capacitor voltage transformer as claimed in claim 1, wherein: the high-voltage capacitor and the medium-voltage capacitor are formed by connecting a plurality of elements in series, and the harmonic detection capacitor is formed by connecting a plurality of elements in parallel; and the harmonic detection capacitor is fastened by adopting an insulating plate in a mechanical fixing mode.
3. The harmonic detection system based on the capacitor voltage transformer as claimed in claim 1, wherein: and a damper is connected in parallel to one of the secondary winding terminals on one side of the intermediate transformer.
4. The harmonic detection system based on the capacitor voltage transformer as claimed in claim 1, wherein: the compensation reactor is provided with a first protection gap wiring end, the compensation reactor is connected with a second protection gap wiring end through a wire, a protection resistor is arranged on the wire, and a protection gap is arranged between the first protection gap wiring end and the second protection gap wiring end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011030183.3A CN112180162A (en) | 2020-09-27 | 2020-09-27 | Harmonic detection system based on capacitive voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011030183.3A CN112180162A (en) | 2020-09-27 | 2020-09-27 | Harmonic detection system based on capacitive voltage transformer |
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| Publication Number | Publication Date |
|---|---|
| CN112180162A true CN112180162A (en) | 2021-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011030183.3A Withdrawn CN112180162A (en) | 2020-09-27 | 2020-09-27 | Harmonic detection system based on capacitive voltage transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113484812A (en) * | 2021-05-26 | 2021-10-08 | 广西电网有限责任公司南宁供电局 | Measuring device and measuring method of capacitive voltage transformer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2328015Y (en) * | 1998-05-08 | 1999-07-07 | 西安电力电容器厂 | Capacitor voltage mutual inductor with harmonic detection function |
| CN201804697U (en) * | 2010-05-20 | 2011-04-20 | 周干国 | Dry-type electromagnetic unit of capacitor voltage transformer |
| CN106199121A (en) * | 2016-07-08 | 2016-12-07 | 国网上海市电力公司 | A kind of capacitance type potential transformer for transient overvoltage monitoring system |
| WO2017101530A1 (en) * | 2015-12-14 | 2017-06-22 | 全球能源互联网研究院 | Capacitive voltage transformer |
| CN110907701A (en) * | 2019-10-25 | 2020-03-24 | 中国电力科学研究院有限公司 | Capacitor voltage transformer with harmonic measurement function |
-
2020
- 2020-09-27 CN CN202011030183.3A patent/CN112180162A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2328015Y (en) * | 1998-05-08 | 1999-07-07 | 西安电力电容器厂 | Capacitor voltage mutual inductor with harmonic detection function |
| CN201804697U (en) * | 2010-05-20 | 2011-04-20 | 周干国 | Dry-type electromagnetic unit of capacitor voltage transformer |
| WO2017101530A1 (en) * | 2015-12-14 | 2017-06-22 | 全球能源互联网研究院 | Capacitive voltage transformer |
| CN106199121A (en) * | 2016-07-08 | 2016-12-07 | 国网上海市电力公司 | A kind of capacitance type potential transformer for transient overvoltage monitoring system |
| CN110907701A (en) * | 2019-10-25 | 2020-03-24 | 中国电力科学研究院有限公司 | Capacitor voltage transformer with harmonic measurement function |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113484812A (en) * | 2021-05-26 | 2021-10-08 | 广西电网有限责任公司南宁供电局 | Measuring device and measuring method of capacitive voltage transformer |
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Application publication date: 20210105 |