CN201698884U - Shielded isolation voltage mutual inductor - Google Patents
Shielded isolation voltage mutual inductor Download PDFInfo
- Publication number
- CN201698884U CN201698884U CN2010202310298U CN201020231029U CN201698884U CN 201698884 U CN201698884 U CN 201698884U CN 2010202310298 U CN2010202310298 U CN 2010202310298U CN 201020231029 U CN201020231029 U CN 201020231029U CN 201698884 U CN201698884 U CN 201698884U
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- winding
- secondary winding
- mutual inductor
- voltage
- shielding
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Abstract
The utility model provides a shielded isolation voltage mutual inductor, which comprises an iron core, a primary winding, a shielding layer, an isolation layer and a secondary winding. An R-type silicon steel sheet iron core, SF6 gas or oil-type insulation structure is adopted. The iron core and a shell body are located at U/2 electric potential. The secondary winding is wrapped with a copper foil layer inside and outside, which serves as an electrostatic shielding. The secondary winding, the copper foil layer and the primary winding are insulated through a polyester film and the insulation level thereof depends on the insulation level of the primary winding of another voltage mutual inductor which is connected with the voltage mutual inductor in series. The secondary winding and the shielding are led out of the shell body through a bushing. The shielded isolation voltage mutual inductor can realize the respective series summation with the voltage of the primary and the secondary windings of another common semi-insulating voltage mutual inductor and ensure the error characteristic thereof is unchanged before and after the serial connection and has the advantages of compact structure, perfect function and high accuracy.
Description
Technical field
The utility model relates to the isolated form voltage transformer, especially is applicable to the higher isolated form voltage transformer of insulating requirements between accuracy and first and second winding, belongs to the instrument voltage transformer technical field.
Background technology
In China's power-frequency voltage ratio value system, need to adopt the identical voltage mutual inductor serial of no-load voltage ratio to realize first and second voltage addition, to finish low-voltage grade value to voltage levels transmission of quantity value process.These two voltage transformers that just require to connect both can have been realized the voltage addition of first and second winding, guaranteed that again both remain unchanged at separately error characteristics before and after cascade process.In order to realize this purpose, wherein an instrument transformer must satisfy under the prerequisite of error requirements, has higher insulation level between first and second winding and between winding and iron core and shell, and winding will have perfect electrostatic screen, avoid before and after series connection, stray parameter changes to the influence that error performance produces.Still there be not at present matured product and the design that meets the demands.
Therefore, be necessary to design a kind of shielding isolated form voltage transformer that can overcome above-mentioned shortcoming, to satisfy the commercial Application needs.
Summary of the invention
Technical problem to be solved in the utility model is: according to the requirement of voltage mutual inductor serial addition circuit, a kind of shielding isolated form voltage transformer is provided, two voltage transformers of series connection both can have been realized the voltage addition of first and second winding, guaranteed that again both remain unchanged in cascade process front and back error characteristics separately.
The technical scheme that the utility model adopted is: a kind of shielding isolated form voltage transformer, it is characterized in that, it comprises iron core, a winding, screen, separator and secondary winding, adopt R type silicon sheet core, SF6 gas or oily formula insulation system, iron core and housing are in the U/2 current potential, outsourcing circle copper foil layer is made electrostatic screen in the secondary winding, insulate with polyester film between secondary winding and copper foil layer and a winding, its insulation level depends on a winding insulation level of an other voltage transformer of the addition of connecting with it, and secondary winding and shielding are drawn housing by sleeve pipe.The technique effect that brings thus is at least: this shielding isolated form voltage transformer, both can realize and the addition of connecting respectively of logical semi-insulated voltage transformer first and second winding voltage of another Daepori, the error characteristics that can guarantee self again remain unchanged before and after the series connection addition, has compact conformation, perfect in shape and function, the advantage that accuracy is high.
Aforesaid shielding isolated form voltage transformer is characterized in that, described shielding isolated form voltage transformer is applicable to that mainly 10kV is above to the following electric pressure of 220kV.
The beneficial effects of the utility model are: one, and insulation system is reasonable, can not directly realize the difficulty of voltage addition when having solved two voltage mutual inductor serials because the secondary winding current potential is different; Its two, guaranteed that by perfect shielding measure two voltage transformers keep original error performance constant in the serial addition circuit measuring process.
Description of drawings
Fig. 1 is the serial addition circuit figure of shielding isolated form voltage transformer of the present utility model.
Fig. 2 is the structural principle schematic diagram of shielding isolated form voltage transformer of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.
The explanation of mark: Tm-band centre cap stepup transformer among Fig. 1; The T1-rated voltage is the common voltage instrument transformer of U; The T2-rated voltage is the voltage transformer of U/2; The T3-rated voltage is the common voltage instrument transformer of U/2; The HE-mutual-inductor tester.
Winding low-pressure end of the explanation of mark: 1-among Fig. 2; Winding high-pressure side of 2-; 3-secondary winding binding post; The 4-shield terminal; The 5-shielded type cable; 6-polyester film insulating barrier; 7-electrostatic screen layer; The 8-secondary winding; The 9-silicon sheet core; Winding of 10-; The 11-shell; The 12-feet that insulate; 13-line bag radome; 14-inflates (oil) valve.
A kind of shielding isolated form voltage transformer that the utility model embodiment provides, it comprises iron core, winding, screen, separator and a secondary winding, adopt R type silicon sheet core, SF6 gas or oily formula insulation system, iron core and housing are in the U/2 current potential, outsourcing circle copper foil layer is made electrostatic screen in the secondary winding, insulate with polyester film between secondary winding and copper foil layer and a winding, its insulation level depends on a winding insulation level of an other voltage transformer of the addition of connecting with it, and secondary winding and shielding are drawn housing by sleeve pipe.
Shielding isolated form voltage transformer of the present utility model is applicable to that mainly 10kV is above to the following electric pressure of 220kV.
As shown in Figure 2, with
Be example, the coil rack that insulating material is done is installed earlier on the main stem stem of R shape silicon sheet core, come coiling, the 8mm insulation distance is arranged between skeleton and iron core column by mechanical device revolving coil skeleton.21 circles of coiling secondary winding then, and the electrostatic screen layer is wrapped up with Copper Foil in the outside in secondary winding, secondary winding and screen are drawn with shielded type cable cover 40kV insulated tube (in order to the voltage between insulation shielding cable and winding and iron core), and heart yearn connects secondary winding, shielding connection Copper Foil.Use polyester film coiling insulating barrier again, in order to isolate the voltage of a secondary winding and a winding tail end, insulation voltage is 40kV, winding 23100 circles of coiling then, insulate with polyester film between winding layers, the installation radome rises and all presses effect outside winding, and the low-pressure end of a winding is drawn with the 40kV bushing, and one time the winding high-pressure side is drawn with the 80kV bushing.Fill SF6 gas or transformer oil to satisfy the built-in electrical insulation requirement.Dress insulation feet between shell and ground, insulation voltage 40kV.Like this, with this shielding isolated form voltage transformer and another
The common voltage mutual inductor serial just can be realized
Voltage ratio, and can measure another according to addition circuit shown in Figure 1
The voltage coefficient of common voltage instrument transformer.
This shielding isolating voltage mutual inductor that the utility model provides, both can realize and the addition of connecting respectively of logical semi-insulated voltage transformer first and second winding voltage of another Daepori, the error characteristics that can guarantee again self remain unchanged before and after the series connection addition, has compact conformation, perfect in shape and function, the advantage that the degree of accuracy is high.
The beneficial effects of the utility model are: one, and insulation system is reasonable, can not directly realize the difficulty of voltage addition when having solved two voltage mutual inductor serials because the Secondary Winding current potential is different; Its two, guaranteed that by perfect shielding measure two voltage transformers keep original error performance constant in the serial addition circuit measuring process.
Claims (2)
1. one kind shields the isolated form voltage transformer, it is characterized in that, it comprises iron core, winding, screen, separator and a secondary winding, adopt R type silicon sheet core, SF6 gas or oily formula insulation system, iron core and housing are in the U/2 current potential, outsourcing circle copper foil layer is made electrostatic screen in the secondary winding, insulate with polyester film between secondary winding and copper foil layer and a winding, its insulation level depends on a winding insulation level of an other voltage transformer of the addition of connecting with it, and secondary winding and shielding are drawn housing by sleeve pipe.
2. shielding isolated form voltage transformer according to claim 1 is characterized in that, described shielding isolated form voltage transformer is applicable to that mainly 10kV is above to the following electric pressure of 220kV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202310298U CN201698884U (en) | 2010-06-21 | 2010-06-21 | Shielded isolation voltage mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202310298U CN201698884U (en) | 2010-06-21 | 2010-06-21 | Shielded isolation voltage mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201698884U true CN201698884U (en) | 2011-01-05 |
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ID=43400130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202310298U Expired - Lifetime CN201698884U (en) | 2010-06-21 | 2010-06-21 | Shielded isolation voltage mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201698884U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958190A (en) * | 2010-06-21 | 2011-01-26 | 国网电力科学研究院 | Shielding and isolating voltage mutual inductor |
| CN102243295A (en) * | 2011-04-26 | 2011-11-16 | 广东电网公司电力科学研究院 | Power frequency voltage ratio device for power frequency voltage addition |
| CN103325556A (en) * | 2013-06-05 | 2013-09-25 | 国家电网公司 | Novel high voltage standard integrated voltage transformer |
-
2010
- 2010-06-21 CN CN2010202310298U patent/CN201698884U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958190A (en) * | 2010-06-21 | 2011-01-26 | 国网电力科学研究院 | Shielding and isolating voltage mutual inductor |
| CN102243295A (en) * | 2011-04-26 | 2011-11-16 | 广东电网公司电力科学研究院 | Power frequency voltage ratio device for power frequency voltage addition |
| CN102243295B (en) * | 2011-04-26 | 2013-11-20 | 广东电网公司电力科学研究院 | Power frequency voltage ratio device for power frequency voltage addition |
| CN103325556A (en) * | 2013-06-05 | 2013-09-25 | 国家电网公司 | Novel high voltage standard integrated voltage transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110105 Effective date of abandoning: 20120523 |