CN220456233U - Bus type current transformer matched with power plant - Google Patents
Bus type current transformer matched with power plant Download PDFInfo
- Publication number
- CN220456233U CN220456233U CN202321957855.4U CN202321957855U CN220456233U CN 220456233 U CN220456233 U CN 220456233U CN 202321957855 U CN202321957855 U CN 202321957855U CN 220456233 U CN220456233 U CN 220456233U
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- insulator
- current transformer
- power plant
- secondary winding
- type current
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- 238000004804 winding Methods 0.000 claims abstract description 52
- 239000012212 insulator Substances 0.000 claims abstract description 39
- 239000003566 sealing material Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 210000000078 claw Anatomy 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 238000009413 insulation Methods 0.000 abstract description 11
- 230000001052 transient effect Effects 0.000 abstract description 10
- 238000009434 installation Methods 0.000 abstract description 8
- 230000005684 electric field Effects 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000010125 resin casting Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Transformers For Measuring Instruments (AREA)
Abstract
The utility model relates to a current metering and line overcurrent protection using device in a generator power system, in particular to a bus type current transformer matched with a power plant. The secondary winding support and the plurality of groups of secondary windings distributed on two sides of the secondary winding support are sealed in the side wall of the insulator, the flange is arranged outside the insulator, a secondary wiring table is arranged on the flange, and secondary wiring terminals of the plurality of groups of secondary windings are led out from the outer surface of the insulator to the secondary wiring table. The utility model has the advantages of compact structure, convenient installation, large creepage distance, high insulation heat-resistant level, uniform electric field, good transient characteristic and high metering precision, and various technical performances of the utility model completely meet the engineering use requirements of large and medium power plants.
Description
Technical Field
The utility model relates to a current metering and line overcurrent protection using device in a generator power system, in particular to a bus type current transformer matched with a power plant.
Background
The bus-type current transformer of the current transmission equipment at the output bus of the generator is used as a large power supply lead, and the bus-type current transformer matched with the bus-type current transformer is mainly used for current measurement, differential motion and transient protection, and the structural design form of the bus-type current transformer generally comprises a phase separation closed bus, a common box closed bus, a phase separation closed bus and an open bus according to the design of a power plant and the power difference of a generator set. However, the working condition of the open bus structure is severe, and the problems of easy moisture absorption, small creepage distance, easy pollution flashover, ground fault and the like exist. The matched high-voltage equipment must have the functions of moisture and dust in the application environment and good shielding measures of the product, so that pollution discharge and grounding faults are reduced, personal electric shock risks and the like are avoided, the application safety of the equipment is improved, and the application requirements of various large and medium-sized power plants are met, so that a bus type current transformer meeting the requirements is urgently needed.
Disclosure of Invention
The utility model aims to solve the problems that the existing open bus type current transformer for a power plant is easy to absorb moisture, has small creepage distance, is easy to generate pollution flashover, ground faults and the like.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the utility model provides a bus-type current transformer matched with a power plant, which comprises an insulator, a secondary winding bracket, a flange plate and a plurality of groups of secondary windings, wherein the insulator is of a cylindrical structure with a bus hole in the center, the secondary winding bracket and the plurality of groups of secondary windings distributed on two sides of the secondary winding bracket are sealed in the side wall of the insulator, the flange plate is arranged outside the insulator, a secondary wiring platform is arranged on the flange plate, and secondary wiring terminals of the plurality of groups of secondary windings are led out from the outer surface of the insulator to the secondary wiring platform.
The insulator, the flange plate and the secondary wiring board are of an integrated structure formed by casting epoxy resin, and the flange plate corresponds to the secondary winding bracket.
And a plurality of umbrella skirts which are sequentially arranged along the axial direction are arranged on the outer circumferences of the two ends of the insulator.
The inner wall of the bus hole of the insulator is provided with a primary voltage-equalizing net and a primary equipotential line connected with the primary voltage-equalizing net.
The secondary winding support is of a circular ring structure, four claws extending into the flange plate are arranged on two sides of the circular ring structure, inserts are arranged on the claws, and two ends of each insert are exposed out of two side faces of the flange plate respectively.
And the insert is provided with a mounting hole.
The secondary winding comprises an insulating shielding material, a secondary wire, a circular iron core and a buffer sealing material, wherein the buffer sealing material is wrapped on the outer side of the circular iron core, the secondary wire is wound on the outer side of the buffer sealing material, and the insulating shielding material is wrapped on the outer side of the secondary wire.
And the flange plate is provided with a grounding bolt.
The outside cover of secondary wiring platform is equipped with the secondary wiring cover.
The utility model has the following advantages and beneficial effects:
1. the utility model has compact structure and convenient installation: adopt epoxy to pour into a mould and form ring insulator structure, the structure is compacter, simple to operate, and the inside and outside insulation of epoxy guarantees can not appear insulating degradation in moisture, condensation environment, and the product directly utilizes the ring flange to install, and the bus hole of once female row from the mutual-inductor passes, reduces the lap joint point of once circuit, avoids connecting the firm increase circuit resistance of fastening, and the radiating effect is good moreover.
2. The utility model has large creepage distance and high insulation heat-resistant grade: the two side end surfaces of the cylindrical insulator are uniformly provided with a plurality of concentric umbrella skirts from the center to the outside, so that the insulation distance between the high-voltage busbar conductors and the ground is effectively increased; and the inner coil material is all made of F-grade insulating material, so that the insulating heat-resistant grade of the product is higher.
3. The utility model has the advantages of uniform electric field, good transient characteristic and high metering precision: the voltage equalizing net on the inner wall of the circular bus hole is provided with a primary equipotential line, and the primary equipotential line is connected with a bus bar penetrating through the transformer, so that the electric field in the inner cavity of the whole transformer is uniform. The secondary protection winding adopts transient protection measures of an air gap and shielding winding measures, and under the application condition, the product has good transient characteristics and accurate measurement; the secondary metering winding adopts an inlet iron core with high initial magnetic permeability and low saturation, so that the metering precision reaches the related precision requirement of 0.2S level, and the safe and reliable operation of power plant equipment is integrally ensured.
Drawings
FIG. 1 is a front view of a bus-type current transformer for a power plant of the present utility model;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a schematic diagram of a secondary winding structure according to the present utility model;
FIG. 4 is a view showing the arrangement of secondary windings in the present utility model;
fig. 5 is a side view of fig. 4.
In the figure: the novel high-voltage transformer is characterized in that the novel high-voltage transformer is composed of an insulator 1, a wrapping insulating shielding material 2, a secondary wire 3, a buffer sealing material 4, a circular ring-shaped iron core 5, a mounting hole 6, an insert 7, a secondary winding bracket 8, a primary voltage equalizing net 9, a bus hole 10, a secondary wiring cover 11, a nameplate 12, a flange plate 13, a secondary grounding bolt 14, a secondary wiring terminal 15, a wiring cover fixing hole 16, a secondary wiring platform 17, a primary equipotential line 18, an umbrella skirt 19 and a secondary winding 20.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 5, the bus-bar type current transformer matched with a power plant provided by the utility model comprises an insulator 1, a secondary winding bracket 8, a flange 13 and a plurality of groups of secondary windings 20, wherein the insulator 1 is of a cylindrical structure with a bus hole 10 in the center, the secondary winding bracket 8 and the plurality of groups of secondary windings 20 distributed on two sides of the secondary winding bracket 8 are sealed in the side wall of the insulator 1, the flange 13 is arranged outside the insulator 1, a secondary wiring table 17 is arranged on the flange 13, and secondary wiring terminals 15 of the plurality of groups of secondary windings 20 are led out to the secondary wiring table 17 from the outer surface of the insulator 1. The utility model provides a bus-type current transformer matched with a power plant, which solves the problems that the existing open bus-type current transformer for the power plant is easy to absorb moisture, has small creepage distance, is easy to generate pollution flashover, has grounding fault and the like.
In the embodiment of the utility model, the insulator 1, the flange 13 and the secondary wiring board 17 are of an integral structure cast by epoxy resin, and the flange 13 corresponds to the secondary winding bracket 8. The embodiment adopts the insulator structure of cylinder that epoxy resin casting formed, and the structure is compacter, simple to operate, and the inside and outside insulation of epoxy resin guarantees can not appear insulating degradation in moisture, condensation environment, and the product directly utilizes ring flange 13 to install, and the bus bar passes from the busbar hole 10 of mutual-inductor once, reduces the lap joint point of primary circuit, avoids connecting fastening insecure, increases the circuit resistance, and the radiating effect is good moreover.
As shown in fig. 1, in the embodiment of the utility model, a plurality of concentric circular umbrella skirts 19 are arranged on the outer circumferences of two ends of the insulator 1 in sequence along the axial direction, so that the insulation distance between the high-voltage busbar fluid and the ground of the product is effectively increased, and the inner coil material is all made of F-level insulation materials, so that the insulation heat-resistant grade of the product is higher.
Further, the inner wall of the bus hole 10 of the insulator 1 is provided with a primary equalizing net 9 and a primary equipotential line 18 connected with the primary equalizing net 9, and the primary equipotential line 18 is connected with a bus bar penetrating through the transformer, so that the electric field of the inner cavity of the whole transformer is uniform.
As shown in fig. 2, in the embodiment of the present utility model, the secondary winding support 8 has a ring structure, four claws extending into the flange 13 are disposed on two sides of the ring structure, each claw is provided with an insert 7, the insert 7 is sealed in the flange 13, and the height of the insert 7 is consistent with the thickness of the flange 13, so that two ends of the insert 7 are exposed to two sides of the flange 13. Further, the insert 7 is provided with a mounting hole 6.
As shown in fig. 3, in the embodiment of the present utility model, the secondary winding 20 includes an insulating shielding material 2, a secondary wire 3, a toroidal core 5 and a buffer sealing material 4, wherein the buffer sealing material 4 is wrapped on the outer side of the toroidal core 5, the secondary wire 3 is wound on the outer side of the buffer sealing material 4, and the insulating shielding material 2 is wrapped on the outer side of the secondary wire 3. The secondary winding 20 adopts transient protection measures with air gaps and shielding winding measures, and under the application condition, the product has good transient characteristics and accurate measurement; the secondary metering winding adopts an inlet iron core with high initial magnetic permeability and low saturation, so that the metering precision reaches the related precision requirement of 0.2S level, and the safe and reliable operation of power plant equipment is integrally ensured.
Further, the flange 13 is provided with a secondary grounding bolt 14, and the outer side of the secondary wiring table 17 is covered with a secondary wiring cover 11, so that electricity theft is prevented, and dust is prevented from falling into the secondary terminal. The secondary wiring cover 11 is fixed at the secondary wiring cover fixing hole 16 to seal the secondary wiring terminal 15. Specifically, the secondary wiring board 17 has a rectangular parallelepiped structure and is integrally formed with the insulator 1, and the secondary wiring board 17 facilitates connection and extraction of a secondary cable when installed.
In this novel embodiment, insulator 1 is for adopting epoxy and once voltage-sharing net 9 and mutual-inductor body to pour into one-piece structure into one-piece, has moisture proof, anti-condensation performance. In this embodiment, the flange 13 of the insulator 1 is provided with four inserts 7, and the inserts 7 and the secondary winding support 8 are integrally formed after casting. I.e. the insulator 1 is directly mounted in place in the power plant by means of four inserts 7, i.e. it is used as a busbar current transformer. The circular busbar hole 10 in the inner cavity of the insulator 1 is used for passing through a high-voltage busbar conductor, the periphery of the busbar hole 10 is provided with a primary voltage-equalizing net 9, and a primary equipotential line 18 is welded on the primary voltage-equalizing net 9 and used as the high-voltage equipotential line. When in use, the primary equipotential lines 18 are connected to the primary busbar, namely serve as connection points with the high-voltage busbar current conductors, so that reliable contact and uniform electric field are ensured.
The utility model provides a bus-type current transformer matched with a power plant, which comprises the following manufacturing process:
after the heat treatment of special equipment, the ring-shaped iron core 5 subjected to paint dipping treatment is wrapped with the buffer sealing material 4, the secondary wire 3 is uniformly wound on the ring-shaped iron core 5 wrapped with the buffer sealing material 4 by using a special winding machine, and the insulating material, the sealing buffer and the semiconductive shielding wrapping material are assisted to be wrapped, so that a secondary winding 20 with a secondary wiring terminal 15 is formed. The same secondary winding 20 can be made into a plurality of secondary winding brackets 8 which are respectively bound on the secondary winding brackets 8 after buffer binding by polyester weft-free adhesive tapes according to the requirement; four inserts 7 are arranged on the outer circumference of the annular secondary winding bracket 8; the secondary winding 20 thus produced is bundled with the secondary winding support 8 into a so-called current transformer body, as shown in fig. 5. And after the current transformer body is subjected to relevant drying treatment, transferring the current transformer body into a pouring workshop for die filling. Firstly, the current transformer body is installed in the middle of a mould, the technological distance of the current transformer body in the mould is adjusted, the four inserts 7 of the secondary winding bracket 8 are utilized to be positioned and fixed with the mould, the secondary wiring terminals 15 are respectively led to the secondary wiring table 17 according to respective identifications, the proper position of the primary voltage equalizing net 9 is adjusted, the grounding wire on the secondary winding bracket 8 is led to the position of the secondary grounding bolt 14 on the flange 13, then whether the connection of all the components is perfect or not is checked, whether the distance is safe or not, residues in the mould cavity are removed, and the like. And after the materials are qualified, die assembly is carried out; the product is flange-type mounting, and the product is directly mounted on a mounting plate by using four inserts 7, namely, the product is used as a bus-type transformer; a plurality of coaxial circular umbrella skirts 19 are arranged from the outer sides Zhou Youyuan of the two ends of the insulator 1 to the near side, so that the insulation distance between the high-voltage busbar conductors of the product and the ground is effectively increased, and the insulation problems such as pollution flashover and the like caused by dust and moisture can be avoided; the inner cavity of the cylindrical insulator 1 is provided with a circular busbar hole 10 through which a high-voltage busbar fluid passes, a primary voltage-equalizing net 9 is arranged at the periphery of the busbar hole 10, a primary equipotential line 18 is connected to the primary voltage-equalizing net 9, and the primary equipotential line 18 is used as a high-voltage equipotential layer to be connected to the primary busbar, so that reliable contact and uniform electric field are ensured; the secondary wiring platform 17 is in a cuboid form and is positioned at the center of the flange of the insulator 1, so that connection and extraction of a secondary cable during installation are facilitated.
In the field installation of the utility model, the installation plate and the installation holes 6 of the four embedded inserts 7 embedded in the flange 13 are directly fixed by bolts, then the high-voltage busbar fluid passes through the busbar holes 10, the high-voltage busbar fluid is reliably connected with the primary equipotential lines 18 after the position is adjusted properly, and finally the electric connection of the secondary wiring terminals 15 is carried out, thus the installation is completed.
The utility model provides a bus-type current transformer matched with a power plant, which is a new product designed completely according to national standards, adopts a rolled iron core, and utilizes the electromagnetic conversion and transient characteristic principles to enable secondary current to accurately reflect the conditions of primary current measurement, high-voltage bus insulation and the like, and transmits the secondary current to a secondary metering and control device to be used as current measurement, relay protection and transient protection.
In conclusion, the utility model is formed by vacuum casting of epoxy resin, and has the advantages of compact structure, convenient installation, large creepage distance, high insulation and heat resistance level, uniform electric field, good transient characteristic and high metering precision, and various technical performances of the utility model completely meet the engineering use requirements of large and medium power plants.
The foregoing is merely an embodiment of the present utility model and is not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.
Claims (9)
1. The utility model provides a generating line formula current transformer is used in power plant cooperation, a serial communication port, including insulator (1), secondary winding support (8), ring flange (13) and multiunit secondary winding (20), wherein insulator (1) is the cylinder structure that the center has busbar hole (10), secondary winding support (8) and multiunit secondary winding (20) of distributing in secondary winding support (8) both sides have been put to the lateral wall of insulator (1), the outside of insulator (1) is equipped with ring flange (13), be equipped with secondary wiring platform (17) on ring flange (13), secondary binding post (15) of multiunit secondary winding (20) are drawn forth to secondary wiring platform (17) by the surface of insulator (1).
2. The bus-bar type current transformer for power plant cooperation according to claim 1, wherein the insulator (1), the flange plate (13) and the secondary wiring board (17) are of an integrated structure cast by epoxy resin, and the flange plate (13) corresponds to the secondary winding bracket (8).
3. The bus-type current transformer for power plant cooperation according to claim 2, wherein a plurality of umbrella skirts (19) are arranged on the outer circumference of the two ends of the insulator (1) in sequence along the axial direction.
4. The bus-type current transformer for the power plant according to claim 1, wherein a primary voltage-equalizing net (9) and a primary equipotential line (18) connected with the primary voltage-equalizing net (9) are arranged on the inner wall of a bus hole (10) of the insulator (1).
5. The bus-type current transformer for power plant cooperation according to claim 1, wherein the secondary winding bracket (8) is of a circular ring structure, four claws extending into the flange plate (13) are arranged on two sides of the circular ring structure, each claw is provided with an insert (7), and two ends of the insert (7) are respectively exposed on two side surfaces of the flange plate (13).
6. The busbar-type current transformer for power plant cooperation according to claim 5, wherein the insert (7) is provided with a mounting hole (6).
7. The bus-bar type current transformer for power plant cooperation according to claim 1, wherein the secondary winding (20) comprises an insulating shielding material (2), a secondary wire (3), a circular iron core (5) and a buffer sealing material (4), wherein the buffer sealing material (4) is wrapped on the outer side of the circular iron core (5), the secondary wire (3) is wound on the outer side of the buffer sealing material (4), and the insulating shielding material (2) is wrapped on the outer side of the secondary wire (3).
8. The busbar-type current transformer for power plant cooperation according to claim 1, wherein the flange (13) is provided with a grounding bolt (14).
9. The busbar-type current transformer for power plant cooperation according to claim 1, wherein the outer side of the secondary wiring block (17) is covered with a secondary wiring cover (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321957855.4U CN220456233U (en) | 2023-07-25 | 2023-07-25 | Bus type current transformer matched with power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321957855.4U CN220456233U (en) | 2023-07-25 | 2023-07-25 | Bus type current transformer matched with power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220456233U true CN220456233U (en) | 2024-02-06 |
Family
ID=89738305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321957855.4U Active CN220456233U (en) | 2023-07-25 | 2023-07-25 | Bus type current transformer matched with power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220456233U (en) |
-
2023
- 2023-07-25 CN CN202321957855.4U patent/CN220456233U/en active Active
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