CN112927889A - Integrated injection silicone rubber composite insulation outdoor current transformer - Google Patents
Integrated injection silicone rubber composite insulation outdoor current transformer Download PDFInfo
- Publication number
- CN112927889A CN112927889A CN201911237468.1A CN201911237468A CN112927889A CN 112927889 A CN112927889 A CN 112927889A CN 201911237468 A CN201911237468 A CN 201911237468A CN 112927889 A CN112927889 A CN 112927889A
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- insulator
- silicone rubber
- current transformer
- integrated injection
- rubber composite
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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
- H01F27/022—Encapsulation
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/327—Encapsulating or impregnating
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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
- H01F38/28—Current transformers
- H01F38/30—Constructions
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention belongs to the technical field of current transformer manufacturing, and particularly relates to an integrated injection silicone rubber composite insulation outdoor current transformer. The transformer comprises an insulator, an iron core sealed in the insulator, and a primary winding and a secondary winding wound on the iron core, wherein the top of the insulator is provided with two primary wiring terminals connected with the primary winding, and each primary wiring terminal is of a plate-shaped structure with a mounting hole; a secondary wiring terminal is arranged on the side surface of the lower part of the insulator; the insulator comprises an epoxy resin insulator and a silicone rubber layer arranged outside the epoxy resin insulator. The invention adopts the integrated injection silicone rubber for curing and molding, has shorter curing time than the traditional adhesive silicone rubber sleeve, shortens the period, has high production efficiency, saves adhesive materials, has low production cost and can be suitable for mass flow line production.
Description
Technical Field
The invention belongs to the technical field of current transformer manufacturing, and particularly relates to an integrated injection silicone rubber composite insulation outdoor current transformer.
Background
An outdoor current transformer is a device for measuring current, electric energy or relay protection in a power system. At present, outdoor current transformers used in power systems: one current transformer is insulated by oil paper and a magnetic bottle, has the defects of large volume, oil leakage, easy pollution flashover, low dynamic-thermal stable current and the like, further needs to be specially maintained and overhauled regularly, and has short service life; the other is a current transformer insulated by adopting common epoxy resin, which solves the problems of large volume, no oiling and low dynamic-thermal stable current, but does not solve the problems of ultraviolet resistance, wind erosion resistance and maintenance free; the problems are always the difficult problems which disturb the maintainers of the electric power system, and are also the problems which are urgently solved in the transformation and development of the outdoor current transformer of the electric power system. Therefore, at present, there is an urgent need to develop an integrated injection silicone rubber composite insulation outdoor current transformer which has the advantages of small volume, compact structure, stable insulation, small partial discharge, rain and pollution flashover resistance and convenient assembly and disassembly.
Disclosure of Invention
The invention provides an integrated injection silicone rubber composite insulation outdoor dry-type current transformer, aiming at solving the defects of large volume, oil leakage, pollution flashover easiness, low dynamic-thermal stable current, ultraviolet wind erosion resistance, complex maintenance and overhaul, short service life and the like of the existing outdoor current transformer of an electric power system.
In order to achieve the purpose, the invention adopts the technical scheme that:
an integrated injection silicone rubber composite insulation outdoor current transformer comprises an insulator, an iron core sealed in the insulator, and a primary winding and a secondary winding wound on the iron core, wherein the top of the insulator is provided with two primary connecting terminals connected with the primary winding, and the primary connecting terminals are of a plate-shaped structure with mounting holes; a secondary wiring terminal is arranged on the side face of the lower part of the insulator; the insulator comprises an epoxy resin insulator and a silicone rubber layer arranged on the outer side of the epoxy resin insulator.
The two primary wiring terminals are vertically arranged and are parallel to each other.
And the root of the primary wiring terminal is provided with an insulating boss along the circumferential direction.
The part of the insulator for encapsulating the primary winding is a high-voltage insulator, and main umbrella skirts which are uniformly distributed are arranged on the outer surface of a silicon rubber layer of the high-voltage insulator.
The top of the high-voltage insulator is provided with an insulation boss for encapsulating the primary lead, and the outer surface of the silicon rubber layer of the insulation boss is provided with secondary sheds which are uniformly distributed.
The part of the insulator for wrapping the secondary winding is a low-voltage insulator, a secondary wiring box is arranged on the side face of the lower part of the low-voltage insulator, and the secondary wiring terminal is accommodated in the secondary wiring box.
And an electronic marking and detecting clamping groove is arranged on the outer side of the low-voltage insulator and is positioned between the secondary junction box and the main umbrella skirt.
The secondary junction box and the epoxy resin insulator on the inner side of the insulator are cast into an integral structure.
The bottom of insulator is equipped with the base, be equipped with rings on the base.
The silicone rubber layer is formed by injecting silicone rubber into a mold and curing.
The invention has the following advantages and beneficial effects:
1. high efficiency, low cost: the invention adopts the integrated injection silicone rubber for curing and molding, has shorter curing time than the traditional adhesive silicone rubber sleeve, shortens the period, has high production efficiency, saves adhesive materials, has low production cost and can be suitable for mass flow line production.
2. Insulation stability, resistant pollution flashover: the invention adopts reasonable structure design, ensures that the product has large surface insulation, and in addition, silicon
3. The invention adopts the rubber insulating material, has good tracking resistance and electric erosion resistance, greatly improves the pollution flashover voltage and can effectively prevent the pollution flashover fault.
3. The maintenance period is long: the silicon rubber material adopted by the invention has good hydrophobicity and hydrophobic migration life, has excellent ultraviolet resistance, and determines that the product does not fade and deteriorate, so the product does not need to be maintained regularly.
4. High dynamic thermal stability current, high metering accuracy: the product of the invention has high primary dynamic and thermal stability current, and can effectively avoid the over-high temperature rise and insulation damage of the mutual inductor caused by system short circuit and over-current; the metering precision can reach 0.2S level, and the metering accuracy of the product under the condition of wide load is effectively ensured.
5. Good sealing performance and electricity larceny prevention: the secondary wiring box is positioned in the integral fully-sealed secondary wiring box, so that a product is prevented from being short-circuited and rusted due to wetting by rainwater; in addition, the secondary cover plate has a lead sealing function, so that the phenomenon of electricity stealing caused by switching the secondary wires is avoided.
Drawings
FIG. 1 is a schematic diagram of the internal structure of the integrated injection silicone rubber composite insulation outdoor current transformer;
FIG. 2 is a front view of the integrated injection silicone rubber composite insulation outdoor current transformer of the present invention;
fig. 3 is a left side view of fig. 2.
In the figure: 1 is an iron core; 2 is a primary winding; 3 is a secondary winding; 4 is a primary wiring terminal; 5 is a secondary junction box; 6 is a base; 7 is an insulating boss; 8 is an epoxy resin insulator; 9 is a main umbrella skirt; 10 is a low-voltage insulator; 11 is an electronic marking card slot: 12 is a silicon rubber layer; 13 is a high-voltage insulator, and 14 is a secondary shed.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-3, the integrated injection silicone rubber composite insulation outdoor current transformer provided by the invention comprises an insulator, an iron core 1 sealed in the insulator, and a primary winding 2 and a secondary winding 3 wound on the iron core 1, wherein two primary connection terminals 4 connected with the primary winding 2 are arranged at the top of the insulator, and the primary connection terminals 4 are of a plate-shaped structure with mounting holes; a secondary wiring terminal is arranged on the side surface of the lower part of the insulator; the insulator comprises an epoxy resin insulator 8 and a silicone rubber layer 12 arranged outside the epoxy resin insulator 8. The epoxy resin insulator 8 is an integral structure formed by vacuum casting of epoxy resin, and the silicone rubber layer 12 is formed by curing injection silicone rubber in a mold. The bottom of insulator is equipped with base 6, is equipped with rings on base 6.
Further, two primary connecting terminal 4 are vertical and parallel to each other, and the root of primary connecting terminal 4 is equipped with insulating boss 7 along circumference.
The part of the primary winding 2 which is enveloped by the insulator is a high-voltage insulator 13, and the outer surface of the silicon rubber layer 12 of the high-voltage insulator 13 is provided with the main umbrella skirt 9 which is uniformly distributed, so that the creepage distance on the surface of the mutual inductor can be effectively increased, the insulation level is increased, and the pollution flashover voltage can not appear. The top of the high-voltage insulator 13 is provided with an insulation boss for encapsulating the primary conductor, and the outer surface of the silicon rubber layer 12 of the insulation boss is provided with secondary sheds 14 which are uniformly distributed.
The part of the insulator for enclosing the secondary winding 3 is a low-voltage insulator 10, a secondary junction box 5 is arranged on the lower side surface of the low-voltage insulator 10, and the secondary junction box is accommodated in the secondary junction box 5. The secondary junction box 5 and the epoxy resin insulator 8 on the inner side of the insulator are cast into an integral structure, sealing of the secondary wiring terminal can be effectively guaranteed, and short circuit and corrosion caused by wetting of rainwater can be avoided, as shown in fig. 3.
An electronic marking and detecting clamping groove 11 is formed in the outer side of the low-voltage insulator 10, and the electronic marking and detecting clamping groove 11 is located between the secondary junction box 5 and the main umbrella skirt 9 so that electronic marking and detecting can be placed conveniently, and the service life of the product label under severe environment is prolonged, as shown in fig. 2.
The manufacturing process of the invention is as follows:
the secondary winding 3 is uniformly wound on the annular iron core 1, and after auxiliary binding of an insulating material is facilitated, the primary winding 2 is wound by using a special tool and is insulated and buffered to be bound, so that a coil body with a primary wiring terminal 4, the primary winding 2 and the secondary winding 3 is formed; fixing the secondary winding 3 on a mould, fixing the primary winding 2 on the mould by adopting a primary wiring terminal 4, adjusting the distance, then using epoxy resin to carry out vacuum pouring, curing and injecting silicon rubber 12 for composite insulation, then forming an integrated structure consisting of the primary wiring terminal 4, a high-voltage insulator 13, a low-voltage insulator 10 and a secondary wiring box 5, integrally installing the integrated structure on a base 6 with a hanging ring, and finally installing an electronic mark inspection clamping groove 11.
In the embodiment of the invention, the primary wiring terminal 4 is of two vertical plate-shaped structures with mounting holes, is arranged in an outdoor environment and can be conveniently and reliably arranged with a plate-shaped bus terminal row; the insulating boss 7 which is formed in one step is designed around the root of the primary wiring terminal 4, so that the phenomenon that the metering precision is influenced because a short circuit channel of the wiring terminal is formed by rainwater and conductive dirt when the mutual inductor operates normally can be effectively avoided; the uniform main umbrella skirt 9 is distributed on the high-voltage insulator 13 for encapsulating the primary winding 2, so that the creepage distance on the surface of the mutual inductor can be effectively increased, the insulation level is increased, and the pollution flashover voltage is prevented. The secondary junction box 5 is integrally cast with the low-voltage insulator 10 for encapsulating the secondary winding and is positioned at the lower part or the right lower part of the side of the low-voltage insulator 10 for encapsulating the secondary winding 3, so that the sealing of the secondary wiring terminal can be effectively ensured, and short circuit and corrosion caused by wetting by rain can be avoided. An electronic mark clamping groove 11 is arranged on the outer side of a low-voltage insulator 10 for encapsulating the secondary winding and is positioned between the secondary junction box 5 and the main umbrella skirt 9 so as to place an electronic mark inspection and prolong the service life of the product label under severe environment.
The integrated injection silicon rubber composite insulation outdoor current transformer is a new product designed completely according to national standards, adopts a rolled iron new product, utilizes an electromagnetic conversion principle, enables a secondary current to accurately reflect the change condition of a measured primary current and transmits the change condition to a secondary metering and controlling device; the product is directly installed in a power line and used for current and electric energy measurement and relay protection.
The invention is formed by compounding and insulating epoxy resin and injected silicon rubber, has small volume, pollution flashover resistance, high dynamic and thermal stability current, ultraviolet wind erosion resistance, long maintenance period and long service life, and can be widely used for newly added circuits or modified circuits in the outdoor of a power system.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, extension, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (10)
1. The integrated injection silicone rubber composite insulation outdoor current transformer is characterized by comprising an insulator, an iron core (1) sealed in the insulator, and a primary winding (2) and a secondary winding (3) wound on the iron core (1), wherein two primary wiring terminals (4) connected with the primary winding (2) are arranged at the top of the insulator, and the primary wiring terminals (4) are of a plate-shaped structure with mounting holes; a secondary wiring terminal is arranged on the side face of the lower part of the insulator; the insulator comprises an epoxy resin insulator (8) and a silicon rubber layer (12) arranged on the outer side of the epoxy resin insulator (8).
2. The integrated injection silicone rubber composite insulation outdoor current transformer according to claim 1, characterized in that the two primary connection terminals (4) are arranged vertically and parallel to each other.
3. The integrated injection silicone rubber composite insulation outdoor current transformer of claim 2, wherein the root of the primary wiring terminal (4) is provided with an insulation boss (7) along the circumferential direction.
4. The integrated injection silicone rubber composite insulation outdoor current transformer of claim 1, wherein the part of the insulator enveloping the primary winding (2) is a high voltage insulator (13), and the outer surface of the silicone rubber layer (12) of the high voltage insulator (13) is provided with uniformly distributed main sheds (9).
5. The outdoor current transformer with integrated injection silicone rubber composite insulation of claim 4, characterized in that the top of the high voltage insulator (13) is provided with an insulation boss for encapsulating a primary wire, and the outer surface of the silicone rubber layer (12) of the insulation boss is provided with uniformly distributed secondary sheds (14).
6. The integrated injection silicone rubber composite insulation outdoor current transformer according to claim 4, characterized in that the part of the insulator enclosing the secondary winding (3) is a low-voltage insulator (10), the lower side of the low-voltage insulator (10) is provided with a secondary junction box (5), and the secondary junction box is accommodated in the secondary junction box (5).
7. The integrated injection silicone rubber composite insulation outdoor current transformer of claim 6, wherein an electronic mark check clamping groove (11) is formed in the outer side of the low-voltage insulator (10), and the electronic mark check clamping groove (11) is located between the secondary junction box (5) and the main umbrella skirt (9).
8. The integrated injection silicone rubber composite insulation outdoor current transformer according to claim 6, characterized in that the secondary junction box (5) is cast as a one-piece structure with the epoxy resin insulation (8) inside the insulation.
9. The integrated injection silicone rubber composite insulation outdoor current transformer of claim 1, wherein a base (6) is arranged at the bottom of the insulator, and a hanging ring is arranged on the base (6).
10. The integrally injected silicone rubber composite insulated outdoor current transformer according to claim 1, wherein the silicone rubber layer (12) is cured molded by injecting silicone rubber in a mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911237468.1A CN112927889A (en) | 2019-12-06 | 2019-12-06 | Integrated injection silicone rubber composite insulation outdoor current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911237468.1A CN112927889A (en) | 2019-12-06 | 2019-12-06 | Integrated injection silicone rubber composite insulation outdoor current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112927889A true CN112927889A (en) | 2021-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911237468.1A Pending CN112927889A (en) | 2019-12-06 | 2019-12-06 | Integrated injection silicone rubber composite insulation outdoor current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112927889A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114243412A (en) * | 2022-01-18 | 2022-03-25 | 大连北方互感器集团有限公司 | Manufacturing method and application of aviation socket with error-proofing device in voltage transformer |
| CN114724845A (en) * | 2022-04-26 | 2022-07-08 | 悉瑞绿色电气(苏州)有限公司 | Rigid constraint method for flexible insulating material pouring transformer winding tap terminal |
-
2019
- 2019-12-06 CN CN201911237468.1A patent/CN112927889A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114243412A (en) * | 2022-01-18 | 2022-03-25 | 大连北方互感器集团有限公司 | Manufacturing method and application of aviation socket with error-proofing device in voltage transformer |
| CN114724845A (en) * | 2022-04-26 | 2022-07-08 | 悉瑞绿色电气(苏州)有限公司 | Rigid constraint method for flexible insulating material pouring transformer winding tap terminal |
| CN114724845B (en) * | 2022-04-26 | 2023-11-28 | 悉瑞绿色电气(苏州)有限公司 | Rigid constraint method for flexible insulating material casting transformer winding tap terminal |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20210608 |