CN201402285Y - Double-layered bell jar type voltage current sensor - Google Patents
Double-layered bell jar type voltage current sensor Download PDFInfo
- Publication number
- CN201402285Y CN201402285Y CN2009200856469U CN200920085646U CN201402285Y CN 201402285 Y CN201402285 Y CN 201402285Y CN 2009200856469 U CN2009200856469 U CN 2009200856469U CN 200920085646 U CN200920085646 U CN 200920085646U CN 201402285 Y CN201402285 Y CN 201402285Y
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- metal cap
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- metal cover
- bell jar
- type voltage
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Abstract
The utility model discloses a double-layered bell jar type voltage current sensor, which comprises an insulating support, an inner metal cover, an outer metal cover, a primary current-carrying conducting wire, and a secondaryt current coil. The two metal covers with the same axial direction are mounted on the insulating support, the outer metal cover is sleeved outside the inner metal cover, the primary current-carrying conducting wire is fixed around the external surface of the outer metal cover, the inner metal cover is connected with the ground, the secondary current coil is arranged in theposition of the inner part of the inner metal cover which is in equal altitude with the primary current-carrying conducting wire, the secondary current coil is connected with one eduction electric cable of the inner metal cover, and the inner metal cover is connected with one conducting wire of a measurement output voltage. The special construction of the double-layered metal cover shielding leads a low-voltage measurement circuit arranged at the inner part of the inner metal cover to be less influenced by the outside, the measurement circuit can reliably steadily work, and the changing of the partial pressure ratio and the current ratio is convenient, thereby suiting the larger range current and voltage rank.
Description
Technical field
The utility model relates to the high-voltage large current measurement and uses sensor, relates in particular to a kind of double layered bell jar type voltage and current sensor, is used for the measurement of high voltage and current, measures, protects, monitors and use for 10kV and above electric system.
Background technology
Along with the high speed development of domestic electric system, represent the digital transformer substation of automation of transformation substations technology highest level to begin to enter in a large number the engineering application.An essential condition that realizes digital transformer substation is exactly: the primary equipment intellectuality is wherein a key component and be used for the mutual inductor of measuring voltage electric current.Main both at home and abroad at present electronic mutual inductor or the optical fiber mutual inductor of adopting, existing electronic mutual inductor great majority all adopt multistage capacitances in series dividing potential drop measuring voltage, adopt the Rogowski coil to measure electric current.The electric capacity that the electronic type voltage transformer of multistage capacitances in series uses is little, just is subjected to the interference of extraneous distributed capacitance easily, is subjected to external factors such as temperature, humidity, electromagnetic field, filth to influence greatly the phenomenon that exists intrinsic standoff ratio to drift about easily; The electric capacity of using is big, and response speed does not just increase, and the charge storage problem has a strong impact on reclosing simultaneously.Current transformer causes the insulation processing difficulty big because the Rogowski coil is enclosed within on the high voltage bus, and the low pressure measurement circuit is subjected to affected by high easily.
Present domestic part mutual inductor all adopts capacitance partial pressure principle measuring voltage, some is realized in the outside, conducting wire with improved column electric capacity ring set, the Rogowski coil is measured electric current, still there is following problem in the combined electronic voltage current transformer of this class formation: the high pressure current passes one-piece construction, badly influence low-voltage circuit, the unitized construction complexity, the High-Voltage Insulation intractability is big, measurement stability is relatively poor, manufacturing cost is also higher, is unfavorable for the commercial Application of electronic voltage current transformer.
Summary of the invention
The purpose of this utility model provides a kind of double layered bell jar type voltage and current sensor, it is simple in structure, easy to manufacture, and the special construction of double-level-metal cover shielding, make and place the low pressure measurement circuit of interior metal cap inside to be subjected to ectocine little, metering circuit can be worked reliable and stablely, the change of intrinsic standoff ratio, current ratio is convenient, can adapt in a big way electric current and electric pressure.
The technical solution of the utility model is: a kind of double layered bell jar type voltage and current sensor, comprise insulated leg, interior metal cap, outer metal cap, current carrying conductor and secondary current coil, described two metal caps are identical being installed on the insulated leg axially, and outer metal cap is sheathed on outside the interior metal cap, the outside surface of described outer metal cap is around being fixed with current carrying conductor one time, metal cap ground connection in described, the contour position of its inner and current carrying conductor is provided with the secondary current coil, and this secondary current coil is connected with an outgoing cable that is positioned at metal cap, and described interior metal cap also is connected to the lead of a measurement output voltage.
Described insulated leg therefrom portion is separated into two parts, and described outer metal cap is installed and two-part top, and described interior metal cap is installed on the bottom of insulated leg separating part, and forms a host cavity with separated portions.
Metal cap inside is provided with two insulated rings in described, and described host cavity is divided into three parts.
Metal cap and outer metal cap are that non-ferromagnetic material is made in described.
Be filled with megohmite insulant between metal cap and the outer metal cap in described.
Described insulated leg bottom is provided with a support, support fix one with the axial identical coil rack of interior metal cap, described secondary current coil is on this coil rack.
Described secondary current coil and current carrying conductor are formed the transformer of an electromagnetic induction principle, and it can be unshakable in one's determination or hollow for having.
Description of drawings
Fig. 1 is the structural drawing of the utility model embodiment.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
The description of symbols of Fig. 1: insulated leg 1, interior metal cap 2, outer metal cap 3,4, current carrying conductors 5 of SF6 gas, host cavity 6, insulated ring 7, coil rack 8, secondary current coil 9, support 10, outgoing cable 11, lead 12.
As shown in Figure 1, double layered bell jar type voltage and current sensor of the present utility model is made up of following parts, and its annexation is:
Insulated leg 1 therefrom portion is separated into two parts, and outer metal cap 3 is installed in the top of this insulated leg 1, and interior metal cap 2 is installed on the bottom of insulated leg 1 along the relative side of two parts, and forms a host cavity 6 with separating part.Interior metal cap 2 and described outer metal cap 3 axial identical its inside that are sheathed on, and be higher than outer metal cap 3, be filled with megohmite insulant between two metal caps, can be gas, liquid, solid etc., in the present embodiment, two metal caps are the bell shape setting, are filled with SF6 gas between the two, the metering circuit that makes the high-voltage great-current loop be opposite to interior metal cap 2 influences very little, has guaranteed the steady operation of metering circuit.The outside surface of described outer metal cap 3 is around being fixed with current carrying conductor 5 one time, itself and outer metal cap 3 insulation.In the host cavity 6 of interior metal cap 2, be provided with host cavity 6 tripartite two insulated rings 7, and three partial volumes are more or less the same, be provided with a coil rack 8 at the middle part of described three parts, it is fixed on the bottom center of described insulated leg 1 by a support 10, and axially identical with interior metal cap 2 and outer metal cap 3.Secondary current coil 9 is wound on the coil rack 8, and be connected with the outgoing cable 11 that is positioned at metal cap 2, according to electromagnetic induction principle, secondary current coil 9 output currents will with the sexual intercourse of primary current retention wire, so outgoing cable 12 output current measuring-signals.Interior metal cap 2 ground connection also connect a lead 12 on it, according to the capacitance partial pressure principle via lead 12 output voltage measuring-signals.By electromagnetic induction principle as can be known, secondary current coil 9 must be passed in the magnetic field of primary current, and therefore interior metal cap 2 and outer metal cap 3 must be made (as aluminium alloy) of nonferromagnetic material.
Measuring principle of the present utility model is to adopt basic capacitance partial pressure to come the transformer of measuring voltage, employing electromagnetic induction principle to measure electric current.The inside and outside metal cap of this double layered bell jar type voltage and current sensor is formed column electric capacity ring set, and the equivalent capacity of column electric capacity ring has constituted the fundamental circuit of capacitance partial pressure, and the equivalent capacity computing formula of column electric capacity ring is as follows:
In the formula: L---the electric capacity ring length;
D---the diameter of electric capacity ring;
The diameter of d---conducting rod.
Can carry out primary Calculation earlier by adopting formula, the diameter and the length of metal cap 2 and outer metal cap 3 in adjusting according to different electric pressures are to satisfy the insulating requirements of different intrinsic standoff ratios and different voltage registrations.
In addition, the transformer of secondary low-voltage current coil 9 and current carrying conductor 5 composition electromagnetic induction principles, this transformer can also can unshakable in one's determination (air-core transformer) with iron core, and its coupling coefficient can be adjusted according to the size of primary current, to adapt to the different application condition.
Double layered bell jar type voltage and current sensor of the present utility model, can measure high tension voltage and electric current simultaneously, and high-voltage great-current is metal cap 3 outside, the secondary low-voltage voltage and current measurement is at interior metal cap 2, unique bell shape setting, making between the high-low pressure is uniform electric field, the fine processing of insulating; In addition, the utility model can adapt to various electric pressures and various electrorheological ratio, only need to adjust that distance between the inside and outside metal cap can adapt to different electric pressures, the number of turn (number of turn of adjustable primary current carrying conductor in case of necessity) of adjusting secondary coil can adapt to different electrorheological ratios, and these adjustment are eaily; The utility model is simple in structure, and processing and manufacturing is easy, thus manufacturing cost is lower, overall volume is little, in light weight.
Claims (7)
1, a kind of double layered bell jar type voltage and current sensor, comprise insulated leg, interior metal cap, outer metal cap, current carrying conductor and secondary current coil, it is characterized in that: described two metal caps are identical being installed on the insulated leg axially, and outer metal cap is sheathed on outside the interior metal cap, the outside surface of described outer metal cap is around being fixed with current carrying conductor one time, metal cap ground connection in described, the contour position of its inner and current carrying conductor is provided with the secondary current coil, and this secondary current coil is connected with an outgoing cable that is positioned at metal cap, and described interior metal cap also is connected to the lead of a measurement output voltage.
2, double layered bell jar type voltage and current sensor as claimed in claim 1, it is characterized in that: described insulated leg therefrom portion is separated into two parts, described outer metal cap is installed and two-part top, metal cap is installed on the bottom of insulated leg separating part in described, and forms a host cavity with separated portions.
3, double layered bell jar type voltage and current sensor as claimed in claim 2 is characterized in that: metal cap inside is provided with two insulated rings in described, and described host cavity is divided into three parts.
4, double layered bell jar type voltage and current sensor as claimed in claim 1 is characterized in that: metal cap and outer metal cap are that non-ferromagnetic material is made in described.
5, double layered bell jar type voltage and current sensor as claimed in claim 1 is characterized in that: be filled with megohmite insulant between metal cap and the outer metal cap in described.
6, double layered bell jar type voltage and current sensor as claimed in claim 1 is characterized in that: described insulated leg bottom is provided with a support, support fix one with the axial identical coil rack of interior metal cap, described secondary current coil is on this coil rack.
7, double layered bell jar type voltage and current sensor as claimed in claim 1 is characterized in that: described secondary current coil and current carrying conductor are formed the transformer of an electromagnetic induction principle, and it can be unshakable in one's determination or hollow for having.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200856469U CN201402285Y (en) | 2009-05-07 | 2009-05-07 | Double-layered bell jar type voltage current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200856469U CN201402285Y (en) | 2009-05-07 | 2009-05-07 | Double-layered bell jar type voltage current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201402285Y true CN201402285Y (en) | 2010-02-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200856469U Expired - Fee Related CN201402285Y (en) | 2009-05-07 | 2009-05-07 | Double-layered bell jar type voltage current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201402285Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615502B (en) * | 2009-05-07 | 2011-11-16 | 国网电力科学研究院 | Double layered bell jar type voltage and current sensor |
| CN113419099A (en) * | 2021-06-18 | 2021-09-21 | 清华大学深圳国际研究生院 | Current measuring device |
| CN114628368A (en) * | 2022-03-10 | 2022-06-14 | 深圳市赛元微电子有限公司 | Electromagnetic shielding device of chip circuit module |
-
2009
- 2009-05-07 CN CN2009200856469U patent/CN201402285Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615502B (en) * | 2009-05-07 | 2011-11-16 | 国网电力科学研究院 | Double layered bell jar type voltage and current sensor |
| CN113419099A (en) * | 2021-06-18 | 2021-09-21 | 清华大学深圳国际研究生院 | Current measuring device |
| CN114628368A (en) * | 2022-03-10 | 2022-06-14 | 深圳市赛元微电子有限公司 | Electromagnetic shielding device of chip circuit module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID ELECTRIC POWER RESEARCH INSTITUTE Owner name: WUHAN NARI CO., LTD. OF STATE GRID ELECTRIC POWER Free format text: FORMER OWNER: STATE GRID ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20110602 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 210003 NO. 8, NANRUI ROAD, NANJING CITY, JIANGSU PROVINCE TO: 430074 NO. 143, LUOYU ROAD, HONGSHAN DISTRICT, WUHAN CITY, HUBEI PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20110602 Address after: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Co-patentee after: State Grid Electric Power Research Insititute Patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Address before: Nanjing City, Jiangsu Province, 210003 South Shui Road No. 8 Patentee before: State Grid Electric Power Research Insititute |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100210 Termination date: 20120507 |