CN111276315B - Current-voltage transformer - Google Patents
Current-voltage transformer Download PDFInfo
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- CN111276315B CN111276315B CN202010084987.5A CN202010084987A CN111276315B CN 111276315 B CN111276315 B CN 111276315B CN 202010084987 A CN202010084987 A CN 202010084987A CN 111276315 B CN111276315 B CN 111276315B
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- voltage
- current
- shielding cylinder
- lead
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/34—Combined voltage and current transformers
- H01F38/36—Constructions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/406—Temperature sensor or protection
Abstract
The invention relates to a current-voltage transformer, comprising: a primary conductive rod for supplying a primary current and a primary voltage; the current measuring body is arranged corresponding to the primary conducting rod and used for measuring the secondary current of the primary conducting rod; the voltage measuring module is arranged corresponding to the primary conducting rod and used for measuring the voltage of the primary conducting rod; and the display module is connected with the current measuring body and the voltage measuring module and used for converting the voltage of the primary conducting rod to obtain a secondary voltage and displaying the secondary current and the secondary voltage. The invention realizes the simultaneous measurement of current and voltage through the current-voltage transformer.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a current-voltage transformer.
Background
The current transformer measures current in the power system and provides a current signal for the protection device, and the voltage transformer measures voltage in the power system and provides a voltage signal for the protection device. Both current transformers and voltage transformers play an important role in electrical power systems. However, current and voltage integrated measurement cannot be realized in the current measuring device.
Disclosure of Invention
The invention aims to provide a current-voltage transformer to realize simultaneous measurement of voltage and current.
In order to achieve the above object, the present invention provides a current-voltage transformer, comprising:
a primary conductive rod for supplying a primary current and a primary voltage;
the current measuring body is arranged corresponding to the primary conducting rod and used for measuring the secondary current of the primary conducting rod;
the voltage measuring module is arranged corresponding to the primary conducting rod and used for measuring the voltage of the primary conducting rod;
and the display module is connected with the current measuring body and the voltage measuring module and used for converting the voltage of the primary conducting rod to obtain a secondary voltage and displaying the secondary current and the secondary voltage.
Optionally, the current measuring body includes: the secondary coil, the secondary coil shielding cylinder and the current secondary lead wire;
the primary conductive rod penetrates through the secondary coil, and the secondary coil is used for converting primary current of the primary guide rod into secondary current;
the secondary coil shielding cylinder is used for shielding the secondary coil to prevent electromagnetic interference;
one end of the current secondary lead is connected with the secondary coil, and the other end of the current secondary lead is connected with the display module and used for displaying the secondary current.
Optionally, the voltage measuring module includes: the device comprises an inner shielding cylinder, a voltage secondary lead, a resistor, a metal sensing piece, a secondary shielding cylinder and an insulating connector;
the inner shielding cylinder is positioned between the secondary coil and the secondary coil shielding cylinder, a certain area on the inner shielding cylinder is used as a measuring area, and the metal sensing piece is fixed in the measuring area through the insulating connecting body;
one end of the resistor is connected with the metal sensing sheet, and the other end of the resistor is connected with the inner shielding cylinder; one end of the voltage secondary lead is connected with the resistor, and the other end of the voltage secondary lead is connected with the display module;
the secondary shielding cylinder is arranged in a measuring area of the inner shielding cylinder; the secondary shielding cylinder is internally provided with the resistor, the metal sensing sheet and the insulating connecting body and is used for preventing electromagnetic field interference.
Optionally, the current-voltage transformer further includes: the device comprises a body shell, a shielding cover, a supporting insulator, a base and a sleeve;
the shell is arranged outside the secondary coil shielding cylinder and the supporting insulator; the secondary coil shielding cylinder and the supporting insulator are protected;
the sleeve wraps the secondary voltage lead and the secondary current lead, the sleeve extends to the outer side of the secondary shielding cylinder, one end of the sleeve is connected with the shell, the other end of the sleeve is connected with the base, and the sleeve is used for protecting the voltage of the primary conducting rod transmitted in the secondary voltage lead and the second current in the secondary current lead from being interfered by the outside; the base is used for fixing the sleeve;
the shielding cover is positioned below the body shell and symmetrically distributed compared with the sleeve for shielding electromagnetic radiation;
one end of the supporting insulator is connected with the secondary shielding cylinder, the other end of the supporting insulator is connected with the shell, and the supporting insulator is used for supporting the secondary shielding cylinder and the shell.
Optionally, the voltage secondary lead and the resistor are connected in parallel.
Optionally, the insulating connector is a polyimide film.
Optionally, the metal sensing piece is a metal piece cut from the inner shielding cylinder.
Optionally, the resistance range of the resistor is 0.1M Ω to 200M Ω.
Optionally, the display module includes: a pressure gauge and a display;
one end of the voltage measuring device is respectively connected with the secondary voltage lead and the secondary current lead, and the other end of the voltage measuring device is connected with the display and used for processing the voltage of the primary conducting rod in the secondary voltage lead to obtain a secondary voltage;
the display is used for displaying the values of the secondary voltage and the secondary current of the primary guide rod.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention relates to a current-voltage transformer, comprising: a primary conductive rod for supplying a primary current and a primary voltage; the current measuring body is arranged corresponding to the primary conducting rod and used for measuring the secondary current of the primary conducting rod; the voltage measuring module is arranged corresponding to the primary conducting rod and used for measuring the voltage of the primary conducting rod; and the display module is connected with the current measuring body and the voltage measuring module and used for converting the voltage of the primary conducting rod to obtain a secondary voltage and displaying the secondary current and the secondary voltage. The invention designs a current-voltage transformer which realizes the simultaneous measurement of current and voltage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of the overall structure of a voltage potential transformer of the present invention;
FIG. 2 is a block diagram of a voltage measurement module according to the present invention;
description of the symbols: 1. the device comprises a shell, 2, a secondary coil shielding cylinder, 3, an inner shielding cylinder, 4, a primary guide rod, 5, a supporting insulator, 6, a current secondary lead, 7, a voltage secondary lead, 8, a shielding cover, 9, a sleeve, 10, a base, 11, a voltage detector, 12, a display, 13, an insulating connector, 14, a resistor, 15, a secondary shielding cylinder, 16, a metal sensing piece, 17 and a secondary coil.
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 only a part of the embodiments of the present invention, and not all of the embodiments.
Detailed Description
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.
The invention aims to provide a current-voltage transformer to realize simultaneous measurement of current and voltage.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic diagram of the overall structure of a voltage-voltage transformer of the present invention, and fig. 2 is a structure of a voltage measuring module of the present invention, the current-voltage transformer including: the device comprises a primary conducting rod 4, a current measuring body, a voltage measuring module and a display module; the primary conducting rod 4 is used for providing primary current and primary voltage; the current measuring body is arranged corresponding to the primary conducting rod 4 and is used for measuring the secondary current of the primary conducting rod 4; the voltage measuring module is arranged corresponding to the primary conducting rod 4 and is used for measuring the voltage of the primary conducting rod 4; the display module is connected with the current measuring body and the voltage measuring module, and is used for converting the voltage of the primary conducting rod 4 to obtain a secondary voltage and displaying the secondary current and the secondary voltage.
As an embodiment of the present invention, the display module includes: a voltage detector 11 and a display 12; one end of the voltage detector 11 is connected to the secondary voltage lead 7 and the secondary current lead 6, respectively, and the other end of the voltage detector 11 is connected to the display 12, and is configured to process the voltage of the primary conducting rod 4 in the secondary voltage lead 7 to obtain a secondary voltage; the display 12 is used for displaying the values of the secondary voltage and the secondary current of the primary guide rod 4.
As an embodiment of the present invention, the current measuring body of the present invention includes: a secondary coil 17, a secondary coil shielding cylinder 2 and a current secondary lead 6; the primary conducting rod 4 penetrates through the secondary coil 17, and the secondary coil 17 is used for converting the primary current of the primary conducting rod 4 into a secondary current; the secondary coil shielding cylinder 2 wraps the secondary coil 17, and the secondary coil shielding cylinder 2 is used for shielding the secondary coil 17 to prevent electromagnetic interference; one end of the current secondary lead 6 is connected with the secondary coil 17, and the other end of the current secondary lead 6 is connected with the display module and used for displaying the secondary current.
As an embodiment of the present invention, the voltage measurement module includes: the device comprises an inner shielding cylinder 3, a voltage secondary lead 7, a resistor 14, a metal sensing sheet 16, a secondary shielding cylinder 15 and an insulating connecting body 13; the inner shielding cylinder 3 is positioned between the secondary coil 17 and the secondary coil shielding cylinder 2, a certain area on the inner shielding cylinder 3 is used as a measuring area, and the metal sensing piece 16 is fixed in the measuring area through the insulating connecting body 13; one end of the resistor 14 is connected with the metal sensing sheet 16, and the other end of the resistor 14 is connected with the inner shielding cylinder 3; the metal sensing piece 16 senses a primary voltage in the primary guide rod 4, and forms a loop with the resistor 14 to convert the primary voltage of the primary guide rod 4 into a voltage across the resistor 14 (i.e., a voltage of the primary conductive rod 4).
One end of the voltage secondary lead 7 is connected with the resistor 14, and the other end of the voltage secondary lead 7 is connected with the display module; the voltage across the resistor 14 (i.e., the voltage of the primary conductive rod 4) is sent to the display module through the voltage secondary lead 7, so that the voltage across the resistor 14 (i.e., the voltage of the primary conductive rod 4) is converted to obtain a secondary voltage, and the secondary voltage is displayed.
The secondary shielding cylinder 15 is arranged in the measuring area of the inner shielding cylinder 3; the resistor 14, the metal sensing piece 16 and the insulating connecting body 13 are arranged in the secondary shielding cylinder 15, and are used for preventing electromagnetic field interference.
As an embodiment of the present invention, the current-voltage transformer further includes: the device comprises a body shell 1, a shielding cover 8, a supporting insulator 5, a base 10 and a sleeve 9; the housing 1 is arranged outside the secondary coil shielding cylinder 2 and the supporting insulator 5; for protecting the secondary coil shielding cylinder 2 and the support insulator 5; the sleeve 9 wraps the secondary voltage lead 7 and the secondary current lead 6, the sleeve 9 extends to the outer side of the secondary shielding cylinder 15, one end of the sleeve 9 is connected with the casing 1, the other end of the sleeve 9 is connected with the base 10, and the sleeve is used for protecting the voltage of the primary conducting rod 4 transmitted in the secondary voltage lead 7 and the second current in the secondary current lead 6 from being interfered by the outside; the base 10 is used for fixing the sleeve 9; the shielding cover 8 is positioned below the body shell 1, is symmetrically distributed compared with the sleeve 9, and is used for shielding electromagnetic radiation; one end of the supporting insulator 5 is connected with the secondary coil shielding cylinder 2, the other end of the supporting insulator 5 is connected with the housing 1, and the supporting insulator 5 is used for supporting the secondary coil shielding cylinder 2 and the housing 1 and plays a role in insulation.
In one embodiment of the present invention, the voltage secondary lead 7 and the resistor 14 are connected in parallel.
In one embodiment of the present invention, the insulating connection body 13 is a polyimide film.
In one embodiment of the present invention, the metal sensor sheet 16 is a metal sheet cut from the inner shield cylinder 3.
In one embodiment of the present invention, the resistance of the resistor 14 ranges from 0.1M Ω to 200M Ω.
The sulfur hexafluoride electronic current transformer is filled with sulfur hexafluoride gas, has good insulating property and a coaxial structure, develops voltage measurement on the basis of the sulfur hexafluoride electronic current transformer and forms a combined current and voltage transformer. The voltage of the primary conductor is measured outside the secondary coil framework of the original sulfur hexafluoride current transformer, so that the operating voltage of the primary conductor can be obtained, and then the combination of the current transformer and the voltage transformer is realized, and the combined current and voltage transformer is formed. The combined current-voltage transformer does not need to be separately provided with a current transformer and a voltage transformer, can quickly acquire the voltage condition of a monitoring part only through an added voltage measuring device, and realizes the simultaneous measurement of voltage and current. The problems that a current transformer and a voltage transformer are troublesome to separately install, expensive in price and the like are solved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A current-voltage transformer, characterized in that it comprises:
a primary conductive rod for supplying a primary current and a primary voltage;
the current measuring body is arranged corresponding to the primary conducting rod and used for measuring the secondary current of the primary conducting rod;
the current measurement body includes: the secondary coil, the secondary coil shielding cylinder and the current secondary lead wire;
the primary conducting rod penetrates through the secondary coil, and the secondary coil is used for converting primary current of the primary conducting rod into secondary current;
the secondary coil shielding cylinder is used for shielding the secondary coil to prevent electromagnetic interference;
one end of the current secondary lead is connected with the secondary coil, and the other end of the current secondary lead is connected with a display module and used for displaying the secondary current;
the voltage measuring module is arranged corresponding to the primary conducting rod and used for measuring the voltage of the primary conducting rod;
the voltage measurement module includes: the device comprises an inner shielding cylinder, a voltage secondary lead, a resistor, a metal sensing piece, a secondary shielding cylinder and an insulating connector;
the inner shielding cylinder is positioned between the secondary coil and the secondary coil shielding cylinder, a certain area on the inner shielding cylinder is used as a measuring area, and the metal sensing piece is fixed in the measuring area through the insulating connecting body;
one end of the resistor is connected with the metal sensing sheet, and the other end of the resistor is connected with the inner shielding cylinder; one end of the voltage secondary lead is connected with the resistor, and the other end of the voltage secondary lead is connected with the display module;
the secondary shielding cylinder is arranged in a measuring area of the inner shielding cylinder; the secondary shielding cylinder is internally provided with the resistor, the metal sensing sheet and the insulating connecting body and is used for preventing electromagnetic field interference;
the metal sensing piece is a metal piece cut from the inner shielding cylinder;
and the display module is connected with the current measuring body and the voltage measuring module and used for converting the voltage of the primary conducting rod to obtain a secondary voltage and displaying the secondary current and the secondary voltage.
2. A current-voltage transformer according to claim 1, characterized in that it further comprises: the device comprises a body shell, a shielding cover, a supporting insulator, a base and a sleeve;
the shell is arranged outside the secondary coil shielding cylinder and the supporting insulator; the secondary coil shielding cylinder and the supporting insulator are protected;
the sleeve wraps the secondary voltage lead and the secondary current lead, the sleeve extends to the outer side of the secondary shielding cylinder, one end of the sleeve is connected with the shell, the other end of the sleeve is connected with the base, and the sleeve is used for protecting the voltage of the primary conducting rod transmitted in the secondary voltage lead and the second current in the secondary current lead from being interfered by the outside; the base is used for fixing the sleeve;
the shielding cover is positioned below the body shell and symmetrically distributed compared with the sleeve for shielding electromagnetic radiation;
one end of the supporting insulator is connected with the secondary coil shielding cylinder, the other end of the supporting insulator is connected with the shell, and the supporting insulator is used for supporting the secondary coil shielding cylinder and the shell.
3. A current-voltage transformer according to claim 2, characterized in that said voltage secondary lead and said resistor are connected in parallel.
4. The current-voltage transformer of claim 2, wherein said insulating connectors are polyimide films.
5. A current-voltage transformer according to claim 2, characterized in that said resistors have a resistance value in the range of 0.1M Ω -200M Ω.
6. The current-voltage transformer according to claim 1, wherein the display module comprises: a pressure gauge and a display;
one end of the voltage measuring device is respectively connected with the secondary voltage lead and the secondary current lead, and the other end of the voltage measuring device is connected with the display and used for processing the voltage of the primary conducting rod in the secondary voltage lead to obtain a secondary voltage;
the display is used for displaying the values of the secondary voltage and the secondary current of the primary guide rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010084987.5A CN111276315B (en) | 2020-02-10 | 2020-02-10 | Current-voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010084987.5A CN111276315B (en) | 2020-02-10 | 2020-02-10 | Current-voltage transformer |
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| Publication Number | Publication Date |
|---|---|
| CN111276315A CN111276315A (en) | 2020-06-12 |
| CN111276315B true CN111276315B (en) | 2021-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010084987.5A Active CN111276315B (en) | 2020-02-10 | 2020-02-10 | Current-voltage transformer |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201134349Y (en) * | 2007-12-29 | 2008-10-15 | 武汉格蓝若光电互感器有限公司 | Novel high-voltage combined independent electronic current, voltage mutual inductor |
| CN202307503U (en) * | 2011-10-31 | 2012-07-04 | 许继集团有限公司 | Electronic current and voltage combined transformer with high-voltage support pillar type suspension structure |
| EP3239997A1 (en) * | 2016-04-25 | 2017-11-01 | ABB Schweiz AG | A hv apparatus and a method of manufacturing such apparatus |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004170172A (en) * | 2002-11-19 | 2004-06-17 | Hokkei Industries Co Ltd | Electric field and magnetic field sensor |
| CN202307504U (en) * | 2011-10-31 | 2012-07-04 | 许继集团有限公司 | Electronic current and voltage combined transformer with high anti-jamming capability |
| CN202384165U (en) * | 2011-10-31 | 2012-08-15 | 许继集团有限公司 | Pillar electronic type current and voltage combined mutual inductor with vertical type coaxial capacitance structure |
| CN106526275A (en) * | 2015-09-09 | 2017-03-22 | 福州怡辉电力设备有限公司 | Electronic current and voltage combined transformer |
| CN205427013U (en) * | 2015-12-04 | 2016-08-03 | 国家电网公司 | Hierarchical formula voltage transformer |
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2020
- 2020-02-10 CN CN202010084987.5A patent/CN111276315B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201134349Y (en) * | 2007-12-29 | 2008-10-15 | 武汉格蓝若光电互感器有限公司 | Novel high-voltage combined independent electronic current, voltage mutual inductor |
| CN202307503U (en) * | 2011-10-31 | 2012-07-04 | 许继集团有限公司 | Electronic current and voltage combined transformer with high-voltage support pillar type suspension structure |
| EP3239997A1 (en) * | 2016-04-25 | 2017-11-01 | ABB Schweiz AG | A hv apparatus and a method of manufacturing such apparatus |
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| CN111276315A (en) | 2020-06-12 |
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