CN102623161B - Bus type current transformer - Google Patents
Bus type current transformer Download PDFInfo
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- CN102623161B CN102623161B CN201210088385.2A CN201210088385A CN102623161B CN 102623161 B CN102623161 B CN 102623161B CN 201210088385 A CN201210088385 A CN 201210088385A CN 102623161 B CN102623161 B CN 102623161B
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- current transformer
- metal shell
- bus
- type current
- transformer according
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 43
- 239000002184 metal Substances 0.000 claims abstract description 43
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 239000010949 copper Substances 0.000 claims abstract description 10
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims description 17
- 238000005266 casting Methods 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 7
- 229920002379 silicone rubber Polymers 0.000 claims description 7
- 239000010410 layer Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000012792 core layer Substances 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 3
- 238000010068 moulding (rubber) Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 238000009413 insulation Methods 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000000465 moulding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Abstract
The invention provides a bus type current transformer, which belongs to the technical field of high voltage and insulation and comprises a body. The body comprises a copper varnished wire, an insulating tape and an annular iron core. The metal casing is cast by aluminum alloy and is coaxial with an insulating sheath, and the insulating sheath is positioned between the metal casing and a bus and tightly attached to the metal casing. The bus type current transformer is scientific and reasonable in design, rich in creation, stable in performance, reliable in running, strong in practicability and advancement, convenient to install, simple in operation and low in running cost. Umbrella skirt structures lengthen creep distance, thereby improving electrical safety coefficient. The insulating sheath and the body can be separated, thereby facilitating installation and using processes of the current transformer. The bus type current transformer is not only suitable for series compensation device, but also suitable for application occasions of low voltage grades of power system portions.
Description
Technical field
The invention belongs to high voltage and insulation technology field, be specifically related to a kind of bus-type current transformer.
Background technology
Bus-type current transformer is generally used for measures electrical system bus electric current, and bus passes from the center of current transformer.General material such as employing epoxy resin or silicon rubber etc. in structure, the insulating material such as epoxy resin are closely attached on current transformer body by cast or alternate manner, the external insulation of current transformer and body are an entirety, when occurring in production process that product insulate underproof situation, deal with pretty troublesome, may need to destroy whole current transformer.
In string benefit engineering, bus-type current transformer measures the electric current of many places bus or line bank on series compensation platform for going here and there the Control protection mended, and require that the small area analysis of normal operation and fault current all will be measured accurately, its operating mode and common instrument transformer have bigger difference.The electromagnetic environment that instrument transformer runs is very complicated, and long-time running voltage is very low, and requires that its lightning impulse withstand level is very high.If adopt existing bus-type current transformer, be difficult to meet performance requirement, when ensureing enough capability of electromagnetic shielding and insulation property, there is the problem that product size is larger, make troubles to the structural design of platform and layout, instrument transformer processing technology is complicated simultaneously, and rate of finished products is low.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of bus-type current transformer, metal shell adopts aluminium alloy casting, it is coaxial with insulating sleeve, insulating sleeve is between metal shell and bus, and fit tightly with metal shell, the umbrella skirt construction of insulating sleeve increases creepage distance, improves Electrical Safety coefficient; Insulating sleeve is separated with body, is convenient to, in the installation and use procedure of current transformer, carry out installing and changing; Design science of the present invention is reasonable, original, stable performance, and reliable, operation cost is low, has stronger practicality and advance; Be not only applicable to series compensation device, be also applicable to the application scenario of electric power system part low-voltage-grade.
To achieve these goals, the present invention takes following technical scheme:
A kind of bus-type current transformer, described current transformer comprises body, described body comprises metal shell and is fixed on the secondary winding of described metal shell inside, described secondary winding comprises copper enamelled wire, insulating tape and annular core, described metal shell adopts aluminium alloy casting, it is coaxial with insulating sleeve, and described insulating sleeve between described metal shell and bus, and fits tightly with described metal shell.
Described insulating sleeve adopts silicon rubber moulding by casting, and its both sides are respectively equipped with 1 ~ 6 layer of umbrella skirt construction.
Described metal shell both sides end face is respectively equipped with dismountable annular end cap, and described annular end cap and metal shell are sealed by sealing ring, the toroidal cavity that inner formation two is symmetrical.
Described sealing ring forms 1mm ~ 5mm Insulating gap in toroidal cavity inner ring side, and at described toroidal cavity remainder, described annular end cap and described metal shell fit tightly.The thickness of described metal shell is 5 ~ 40mm, is excellent with 5 ~ 20mm.
The number of described secondary winding is 2, is respectively equipped with described secondary winding in described two symmetrical toroidal cavities, and described secondary winding and metal shell solidify out into one by epoxy resin.
Described current transformer also comprises secondary terminal box, and described secondary terminal box is arranged at the side bottom described metal shell, and secondary wiring terminals is arranged in described secondary terminal box.
1 ~ 10 layer, described copper enamelled wire is close around on annular core, and interlayer insulating tape makes copper enamelled wire isolate.
Compared with prior art, beneficial effect of the present invention is:
1. design science is reasonable, original, and stable performance is reliable, has stronger practicality and advance;
2. easy for installation, simple to operate, operation cost is low;
3. umbrella skirt construction increases creepage distance, improves Electrical Safety coefficient;
4. insulating sleeve adopts moulding by casting silicon rubber, is separated, can carries out quality control separately, conforming product rate is improved greatly, and be convenient to, in the installation and use procedure of current transformer, carry out installing and changing with body;
5. be not only applicable to series compensation device, be also applicable to the application scenario of electric power system part low-voltage-grade.
Accompanying drawing explanation
Fig. 1 is the front view of bus-type current transformer;
Fig. 2 is the left view of bus-type current transformer;
Fig. 3 is the cutaway view of bus-type current transformer;
Wherein: 1. insulating sleeve, 2. metal shell, 3. secondary winding, 4. secondary terminal box.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details.
As Fig. 1-Fig. 3, current transformer comprises body, described body comprises metal shell and is fixed on the secondary winding of described metal shell inside, described secondary winding comprises copper enamelled wire, insulating tape and annular core, described metal shell adopts aluminium alloy casting, it is coaxial with insulating sleeve, and described insulating sleeve between described metal shell and bus, and fits tightly with described metal shell.
Described insulating sleeve adopts silicon rubber moulding by casting to have good insulation property, pliability is good, production technology is simple, rate of finished products is high, the both sides of insulating sleeve are respectively equipped with 1 ~ 6 layer of umbrella skirt construction, the arcing distance and the creepage distance that change bus-type current transformer only need to change umbrella skirt construction, and the body of bus-type current transformer does not need to change.
Described metal shell both sides end face is respectively equipped with dismountable annular end cap, and described annular end cap and metal shell are sealed by sealing ring, the toroidal cavity that inner formation two is symmetrical.
Described sealing ring forms 1mm ~ 5mm Insulating gap in toroidal cavity inner ring side, and at described toroidal cavity remainder, described annular end cap and described metal shell fit tightly.The thickness of described metal shell is 5 ~ 40mm, is excellent, both can have ensured that metal shell has enough mechanical strengths, can realize good capability of electromagnetic shielding again with 5 ~ 20mm.
The number of described secondary winding is 2, is respectively equipped with described secondary winding in described two symmetrical toroidal cavities, and described secondary winding and metal shell solidify out into one by epoxy resin.
Described current transformer also comprises secondary terminal box, and described secondary terminal box is arranged at the side bottom described metal shell, and secondary wiring terminals is arranged in described secondary terminal box.
1 ~ 10 layer, described copper enamelled wire is close around on annular core, and interlayer insulating tape makes copper enamelled wire isolate.
Design science of the present invention is reasonable, original, stable performance, and reliable, easy for installation, simple to operate, operation cost is low, has stronger practicality and advance; Insulating sleeve adopts moulding by casting silicon rubber, be separated with body, quality control can be carried out separately, conforming product rate is improved greatly, and be convenient in the installation and use procedure of current transformer, carry out installing and changing, the umbrella skirt construction that insulating sleeve is arranged increases creepage distance, improves Electrical Safety coefficient; The present invention is widely used, and is not only applicable to series compensation device, is also applicable to the application scenario of electric power system part low-voltage-grade.
2004, the bus-type current transformer developed by China Electric Power Research Institute was applied to 220kV series compensation engineering, started hanging net operation.In 2007, this product improved, and the instrument transformer comparatively simplifies processing technology, improve the rate of finished products of product, was widely applied at present.There are two independently secondary winding metal shell inside, and the body of current transformer and insulating sleeve adopt split-type structural, different from traditional bus-type current transformer.The shell of current transformer body adopts cast aluminium, effectively improves the capability of electromagnetic shielding of current transformer; Insulating sleeve adopts moulding by casting silicon rubber, is separated, is convenient to, in the installation and use procedure of current transformer, carry out installing and changing with body.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. a bus-type current transformer, described current transformer comprises body, described body comprises metal shell and is fixed on the secondary winding of described metal shell inside, described secondary winding comprises copper enamelled wire, insulating tape and annular core, it is characterized in that: described metal shell adopts aluminium alloy casting, it is coaxial with insulating sleeve, and described insulating sleeve between described metal shell and bus, and fits tightly with described metal shell;
Described metal shell both sides end face is respectively equipped with dismountable annular end cap, and described annular end cap and metal shell are sealed by sealing ring, the toroidal cavity that inner formation two is symmetrical;
Described sealing ring forms 1mm ~ 5mm Insulating gap in toroidal cavity inner ring side, and at described toroidal cavity remainder, described annular end cap and described metal shell fit tightly.
2. bus-type current transformer according to claim 1, is characterized in that: described insulating sleeve adopts silicon rubber moulding by casting, and its both sides are respectively equipped with 1 ~ 6 layer of umbrella skirt construction.
3. bus-type current transformer according to claim 1, is characterized in that: the thickness of described metal shell is 5 ~ 40mm.
4. bus-type current transformer according to claim 3, is characterized in that: the thickness of described metal shell is 5 ~ 20mm.
5. bus-type current transformer according to claim 1, it is characterized in that: the number of described secondary winding is 2, be respectively equipped with described secondary winding in described two symmetrical toroidal cavities, described secondary winding and metal shell solidify out into one by epoxy resin.
6. bus-type current transformer according to claim 1, is characterized in that: described current transformer also comprises secondary terminal box, and described secondary terminal box is arranged at the side bottom described metal shell.
7. bus-type current transformer according to claim 6, is characterized in that: secondary wiring terminals is arranged in described secondary terminal box.
8. bus-type current transformer according to claim 1, is characterized in that: 1 ~ 10 layer, described copper enamelled wire is close around on annular core, and interlayer insulating tape makes copper enamelled wire isolate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210088385.2A CN102623161B (en) | 2012-03-29 | 2012-03-29 | Bus type current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210088385.2A CN102623161B (en) | 2012-03-29 | 2012-03-29 | Bus type current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102623161A CN102623161A (en) | 2012-08-01 |
| CN102623161B true CN102623161B (en) | 2015-03-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210088385.2A Active CN102623161B (en) | 2012-03-29 | 2012-03-29 | Bus type current transformer |
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| Country | Link |
|---|---|
| CN (1) | CN102623161B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB290651A (en) * | 1927-05-19 | 1929-04-25 | Ass Elect Ind | Improvements in or relating to high voltage insulators |
| US4510477A (en) * | 1983-10-19 | 1985-04-09 | Westinghouse Electric Corp. | Current transformer |
| CN2265582Y (en) * | 1996-04-12 | 1997-10-22 | 苏仲衡 | Outdoor dry current transformer |
| CN1350304A (en) * | 2001-12-08 | 2002-05-22 | 弥璞 | Composite high-voltage casing and its production process |
| CN1808645A (en) * | 2005-01-19 | 2006-07-26 | 江苏思源赫兹互感器有限公司 | Sulfur hexafluoride current transformer |
| CN201478106U (en) * | 2009-09-09 | 2010-05-19 | 大连泰克电气有限公司 | LMZB7-35 bus-type current transformer |
| CN102623153A (en) * | 2012-03-29 | 2012-08-01 | 中国电力科学研究院 | Insulating sheath for current transformer |
-
2012
- 2012-03-29 CN CN201210088385.2A patent/CN102623161B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB290651A (en) * | 1927-05-19 | 1929-04-25 | Ass Elect Ind | Improvements in or relating to high voltage insulators |
| US4510477A (en) * | 1983-10-19 | 1985-04-09 | Westinghouse Electric Corp. | Current transformer |
| CN2265582Y (en) * | 1996-04-12 | 1997-10-22 | 苏仲衡 | Outdoor dry current transformer |
| CN1350304A (en) * | 2001-12-08 | 2002-05-22 | 弥璞 | Composite high-voltage casing and its production process |
| CN1808645A (en) * | 2005-01-19 | 2006-07-26 | 江苏思源赫兹互感器有限公司 | Sulfur hexafluoride current transformer |
| CN201478106U (en) * | 2009-09-09 | 2010-05-19 | 大连泰克电气有限公司 | LMZB7-35 bus-type current transformer |
| CN102623153A (en) * | 2012-03-29 | 2012-08-01 | 中国电力科学研究院 | Insulating sheath for current transformer |
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| Publication number | Publication date |
|---|---|
| CN102623161A (en) | 2012-08-01 |
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| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20130712 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20130712 Address after: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant after: China Electric Power Research Institute Applicant after: State Grid Corporation of China Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant before: China Electric Power Research Institute |
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