CN219800652U - Sleeve type current transformer for steam turbine generator unit - Google Patents
Sleeve type current transformer for steam turbine generator unit Download PDFInfo
- Publication number
- CN219800652U CN219800652U CN202320988289.7U CN202320988289U CN219800652U CN 219800652 U CN219800652 U CN 219800652U CN 202320988289 U CN202320988289 U CN 202320988289U CN 219800652 U CN219800652 U CN 219800652U
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- current transformer
- winding
- type current
- sleeve type
- generator set
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- 238000004804 winding Methods 0.000 claims abstract description 72
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000009413 insulation Methods 0.000 claims abstract description 13
- 239000003973 paint Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 8
- 230000017525 heat dissipation Effects 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000007935 neutral effect Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development 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
- 239000000428 dust Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The utility model relates to a current transformer, in particular to a sleeve type current transformer for a steam turbine generator unit. The secondary coil comprises an iron core, a secondary winding and an insulating layer, wherein the iron core is of a circular ring structure, the secondary winding is wound on the iron core, and the insulating layer is wrapped on the outer side of the secondary winding; the secondary winding includes a primary winding and a shield winding. The secondary junction box is fixed on the mounting plate and is positioned at the outer side of the secondary coil, a secondary outlet plate is arranged in the secondary junction box, a secondary wiring stud is arranged on the secondary outlet plate, and the secondary coil is connected with the secondary wiring stud through a secondary winding lead. The utility model has the advantages of small volume, light weight, good heat dissipation condition, flexible installation, high insulation heat-resistant grade and strong adjacent magnetic field interference resistance, and ensures that the transformer can safely operate for a long time under the conditions of small space, high environmental temperature.
Description
Technical Field
The utility model relates to a current transformer, in particular to a sleeve type current transformer for a steam turbine generator unit.
Background
The sleeve type current transformer for the generator outlet steam turbine generator unit is arranged at the positions of the outlet end and the neutral point end of the thermal generator unit and is used for measuring current, electric energy or relay protection, the installation mode is mostly in a sleeved mode, and 4-5 sets of current transformers are assembled and installed. At present, the transformer has the advantages of small installation space, strong adjacent magnetic field interference, high environmental temperature, poor heat dissipation condition, high insulation heat-resistant grade, large product volume, heavy mass and difficult disassembly and assembly, and the problems are always the problems which trouble transformer designers and on-site power system maintenance staff and are urgent to solve in the development of the transformer special for the generator outlet.
Disclosure of Invention
The utility model aims to solve the problems that a large-current transformer special for an outlet of an existing generator is large in size, heavy in weight, difficult to assemble and disassemble, difficult to dissipate heat of the transformer, low in insulation heat-resistant level, easy to saturate in local parts of adjacent magnetic field interference strong iron cores and the like.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the utility model provides a sleeve type current transformer for a steam turbine generator unit, which comprises a secondary coil, a secondary junction box and a mounting plate, wherein the mounting plate is of a circular structure, the secondary coil is fixed on the mounting plate and concentric with the mounting plate, the secondary junction box is fixed on the mounting plate and is positioned at the outer side of the secondary coil, a secondary wire outlet plate is arranged in the secondary junction box, a secondary wire connection stud is arranged on the secondary wire outlet plate, and the secondary coil is connected with the secondary wire connection stud through a secondary winding lead.
The secondary junction box comprises a box body, a rear cover and a front cover, wherein the box body is of a rectangular frame structure with two open ends, the box body is fixedly connected with the mounting plate, and the rear cover and the front cover are respectively and hermetically connected at the two open ends of the box body; the left side wall and the right side wall of the box body are provided with threading holes, rubber plugs are arranged in the threading holes, and the rubber plugs are of hollow structures so that cables can pass through; the rear cover is provided with a wire inlet used for the secondary winding lead wire to pass through; the secondary outlet plate is arranged in parallel with the rear cover and the front cover.
The secondary wiring stud is made of copper; the secondary wire outlet plate is made of epoxy resin, and the secondary wiring stud and the secondary wire outlet plate are cast into a whole.
The secondary junction box is made of cast aluminum materials, and warning identification plates and grounding bolts are respectively arranged on the top and the side walls of the secondary junction box.
One side of the mounting plate is radially provided with a boss, and the secondary junction box is fixed on the boss.
The mounting plate is provided with a label frame and a label arranged on the label frame.
The secondary coil is fixed on the mounting plate through a binding belt.
The secondary coil comprises an iron core, a secondary winding and an insulating layer, wherein the iron core is of a ring-shaped structure, the secondary winding is wound on the iron core, and the insulating layer is wrapped on the outer side of the secondary winding.
The secondary winding comprises a main winding and a plurality of layers of shielding windings positioned at the inner side of the main winding, each layer of shielding winding is of a symmetrical structure formed by reversely winding two wires, and the two wires are connected in parallel; the two adjacent shielding windings are connected in series, and the symmetry axes are mutually perpendicular.
The insulating layer comprises insulating paint and an insulating film which are arranged from inside to outside.
The utility model has the following advantages and beneficial effects:
1. small volume, light weight, good heat dissipation condition and flexible installation: the utility model optimizes the structural design, has more compact structure, and can effectively save the height space when a plurality of combinations are installed when a user installs the device.
2. The utility model has high insulation heat-resistant grade, and ensures that the transformer can safely run for a long time under the conditions of small space shan and high environmental temperature.
3. The secondary windings of the utility model are internally provided with shielding windings with multilayer symmetrical structures, and the influence of the magnetic field of adjacent phase current on the shielding windings is shielded, so that the local saturation of the transformer core is prevented, and the performance of the transformer is deteriorated.
4. Insulation is stable, and operation is safe: the secondary wire outlet plate is made of epoxy resin, the secondary wire connection stud and the secondary wire outlet plate are integrally cast, and the secondary wire connection stud and the secondary wire connection box are well insulated when in use by a user, so that the operation is safer.
Drawings
FIG. 1 is a schematic diagram of a sleeve type current transformer for a turbo generator set according to the present utility model;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a schematic view of a junction box according to the present utility model;
FIG. 4 is a schematic view of the installation of the junction box of the present utility model;
fig. 5 is a rear view of fig. 4.
In the figure: 1-an iron core; 2-secondary winding; 3-secondary junction box; 4-a rear cover; 5-a front cover; 6-secondary wiring studs; 7-a secondary outlet plate; 8-signage; 9-binding bands; 10-mounting plates; 11-insulating paint; 12-an insulating film; 13-countersink; 14-a rubber plug; 15-secondary winding leads; 16-capping screws; 17-a wire inlet; 18-a grounding bolt; 19-a ground identification; 20-warning sign; 21-primary identification.
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.
Referring to fig. 1-2, the utility model provides a sleeve type current transformer for a steam turbine generator unit, which comprises a secondary coil, a secondary junction box 3 and a mounting plate 10, wherein the mounting plate 10 is of a circular ring structure, the secondary coil is fixed on the mounting plate 10 and is concentric with the mounting plate 10, the secondary junction box 3 is fixed on the mounting plate 10 and is positioned at the outer side of the secondary coil, a secondary outlet plate 7 is arranged in the secondary junction box 3, a secondary wiring stud 6 is arranged on the secondary outlet plate 7, and the secondary coil is connected with the secondary wiring stud 6 through a secondary winding lead 15. The utility model optimizes the structural design, has more compact structure, and can effectively save the height space when a plurality of combinations are installed when a user installs the device.
Referring to fig. 3-5, in the embodiment of the utility model, the secondary junction box 3 comprises a box body, a rear cover 4 and a front cover 5, wherein the box body is a rectangular frame structure with two open ends, the box body is fixedly connected with a mounting plate 10, and the rear cover 4 and the front cover 5 are respectively and hermetically connected at the two open ends of the box body; the left and right side walls of the box body are provided with threading holes, rubber plugs 14 are arranged in the threading holes, and the rubber plugs 14 are of hollow structures so that cables can pass through; the rear cover 4 is provided with a wire inlet 17 for the secondary winding lead 15 to pass through, and the secondary winding lead 15 is welded with 6mm 2 The high-temperature wires are led into the secondary junction box 3 through a wire inlet 17 on the rear cover 4, the secondary winding leads 15 are connected with the secondary wiring studs 6, and the secondary wire outlet plate 7 is arranged in parallel with the rear cover 4 and the front cover 5.
Specifically, the secondary outlet plate 7 is made of epoxy resin, and the secondary wiring stud 6 is made of copper; the secondary wiring stud 6 and the secondary outlet plate 7 are cast into a whole, so that the secondary wiring stud 6 and the secondary wiring box 3 are well insulated when a user uses the secondary wiring stud, and the operation is safer. The secondary junction box 3 is made of cast aluminum materials, mechanical strength is guaranteed, and a warning sign board 20 and a grounding bolt 18 are respectively arranged on the top and the side wall of the secondary junction box 3. Specifically, the grounding bolt 18 is positioned on the left side of the secondary junction box 3, the grounding bolt 18 is grounded with the identification 19, and the warning identification board 20 is stuck above the secondary junction box 3 by anaerobic adhesive.
Specifically, the rear cover 4 is fixed to the rear end of the secondary terminal box 3 with a set of cover screws 16 with lead-sealed holes, ensuring that the secondary winding leads 15 are introduced from the inlet 17 of the rear cover 4. The front cover 5 is fixed to the front end of the secondary terminal box 3 with another set of cover screws 16 with lead-sealed holes.
Further, referring to fig. 1-2, one side of the mounting plate 10 is provided with a square boss in the radial direction, the boss is provided with a countersunk hole 13, and the secondary junction box 3 is fixed on the countersunk hole 13 on the boss through an inner hexagon head bolt. The mounting plate 10 is provided with a label frame and a label 8 arranged on the label frame through bolts, and the primary label 21 is sprayed on the mounting plate 10.
Referring to fig. 1-2, in an embodiment of the utility model, the secondary coil is secured to a mounting plate 10 by a binding 9. In this embodiment, the secondary coil includes an iron core 1 and an insulating layer of a secondary winding 2, wherein the iron core 1 has a ring structure, the secondary winding 2 is wound on the iron core 1, and the insulating layer is wrapped on the outer side of the secondary winding 2.
In the embodiment of the utility model, the secondary winding 2 comprises a main winding and a plurality of layers of shielding windings positioned at the inner side of the main winding, each layer of shielding winding is of a symmetrical structure formed by reversely winding two wires, and the two wires are connected in parallel; the two adjacent shielding windings are connected in series, and the symmetry axes are mutually perpendicular.
Specifically, the shield winding is wound from the inner layer, the shield winding is formed by symmetrically winding two wires from the starting point along the left and right directions of the iron core 1, the winding directions are opposite, the winding direction is wound from half a circle to the opposite side of the starting point, and the winding is wound back to the starting point, so that a group of shield windings is formed. And (3) pulling the two tail wires to the position of 90 degrees of the starting point, winding again according to the method, welding the tail wires together, and leading out the single wire to continue forward winding to obtain the main winding. The shielding windings are generally two groups or three groups, each group of shielding windings is 2 layers, the total number of layers is four layers or six layers, and the shielding windings are used for shielding the influence of the magnetic field of adjacent current on the shielding windings so as to prevent the local saturation of the transformer core and the performance deterioration of the transformer.
In the embodiment of the present utility model, the insulating layer includes the insulating varnish 11 and the insulating film 12 provided from inside to outside. Specifically, the secondary winding 2 is coated with insulating paint 11 with insulating and heat-resisting grades of H, and is coated with a polyester film Bao Lingge after being dried. The heat dissipation condition is good, the insulation heat-resistant grade of the transformer is improved, the wires and the insulation materials used by the transformer are above the F level, and part of the insulation heat-resistant grade of the materials reaches the H level, so that the transformer can safely operate for a long time under the conditions of small space, high environmental temperature. The secondary coil is bound on the mounting plate 10 by the binding belt 9, and the mounting plate 10 has the advantages of high mechanical strength, F-level insulating layer, high temperature resistance and the like. When the user installs, convenient and fast, and with the mutual-inductor small, light in weight of epoxy pouring in cast aluminum shell or copper shell than traditional, the heat dissipation condition is also improved a lot.
The sleeve type current transformer for the steam turbine generator unit has the advantages of small volume, light weight, easiness in heat dissipation, high insulation heat-resistant grade and strong adjacent magnetic field interference resistance. The whole transformer is dry, does not have an external cast aluminum shell or copper shell and is not cast by epoxy resin. The primary conductor at the outlet end or the neutral point end of the generator passes through the inner cavity of the transformer, and the secondary lead of the secondary winding 2 is led out from the secondary junction box 3, so that the whole structure is compact. When a user is connected, the front cover 5 is detached, the secondary outgoing line of the user is connected to the secondary connection stud 6, the secondary outgoing line of the user is led out from the rubber plug 14, and then the front cover 5 is fixed on the secondary connection box 3.
The utility model provides a sleeve type current transformer for a steam turbine generator unit, which comprises the following preparation processes:
the secondary winding 2 of the product is uniformly wound on the annular iron core 1, the shielding winding and the secondary winding 2 are wound by a special winding machine, insulating materials are bound in an auxiliary mode, H-level insulating paint 11 is soaked, the coil is dried, an outer Bao Lingge rubberized polyester film is coated after drying, binding belts 9 are used for binding and fixing on a mounting plate 10, and the whole is dried again. The binding belt 9 has good softness and viscosity, is in a net structure after being pulled open, is easy to unreel, does not scatter wires and has no overlapping mark. The binding belt 9 has excellent performances of high strength, impact resistance, high modulus, low extension, no hysteresis loss, no eddy current loss and the like when used in the product. The secondary junction box 3 is fixed on the countersunk hole 13 of the mounting plate 10 by using an inner hexagon head bolt, the secondary outlet plate 7 is fixed on the inner cavity of the secondary junction box 3 by using an inner hexagon head bolt, rubber plugs 14 are mounted on two ends of the secondary junction box 3, secondary winding leads 15 are led in from the rear end of the secondary junction box 3 and welded on the secondary junction studs 6, the rear cover 4 is fixed on the rear end face of the secondary junction box 3 by using a cover screw 16 with lead sealing, the front cover 5 is fixed on the front end face of the secondary junction box 3 by using a cover screw 16 with lead sealing, and the secondary junction studs 6 at the front end of the secondary junction box 3 are protected from being touched and play a role of dust prevention. The left end of the secondary junction box 3 is fitted with a grounding bolt 18 and a grounding mark 19. The warning sign 20 is attached directly above the secondary junction box 3. The label 8 is riveted on the label frame, the label frame is fixed on the mounting plate 10 by using hexagon socket head cap bolts and nuts and is positioned at the left side of the secondary junction box 3, the front side of the label 8 faces to the outer side, and the primary mark 21 is sprayed on the right side of the mounting plate 10.
The sleeve type current transformer for the turbo generator set is mainly arranged at the outlet end and the neutral point end of a generator in a sleeved mode, a plurality of transformers combined in various stages are fixed into a whole through special mounting holes on a mounting plate by using limit screws, branch pipes and matched fasteners (all made of non-magnetic materials), and each transformer is enabled to dissipate heat in a certain gap and then is integrally sleeved on primary conductors at the outlet end and the neutral point end. When a user is connected, the front cover 5 of the secondary junction box 3 is detached, the secondary outgoing line of the user is connected to the secondary junction stud 6, the secondary outgoing line of the user is led out from the rubber plug 14, the front cover 5 is fixed on the secondary junction box 3, and the grounding bolt 18 on the secondary junction box 3 is reliably grounded, so that the installation is completed.
The sleeve type current transformer for the steam turbine generator unit is a new product designed completely according to the national standard, adopts a rolled iron core, and utilizes the electromagnetic conversion principle to enable the secondary current to accurately reflect the change condition of the primary current to be measured and transmit the change condition to a secondary metering and controlling device; the product is directly arranged at the outlet end and the neutral point end of the generator and is used for measuring current and electric energy and relaying protection.
The product of the utility model adopts dry coil vacuum paint dipping, is bound on a mounting plate, has small volume, light weight, easy heat dissipation, high insulation and heat resistance level, strong adjacent magnetic field interference resistance, complete functions, large capacity, convenient installation, easy maintenance, stable insulation and safe operation, and can be widely used for installation and use of the outlet end and the neutral point end of a thermal generator.
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 (10)
1. The utility model provides a bushing type current transformer for turbo generator set, a serial communication port, including secondary coil, secondary terminal box (3) and mounting panel (10), wherein mounting panel (10) are ring shape structure, secondary coil fixes on mounting panel (10) and concentric with mounting panel (10), secondary terminal box (3) are fixed on mounting panel (10) and are located the outside of secondary coil, are equipped with secondary wire board (7) in secondary terminal box (3), are equipped with secondary wiring double-screw bolt (6) on secondary wire board (7), secondary coil passes through secondary winding lead wire (15) and is connected with secondary wiring double-screw bolt (6).
2. The sleeve type current transformer for the turbo generator set according to claim 1, wherein the secondary junction box (3) comprises a box body, a rear cover (4) and a front cover (5), wherein the box body is of a rectangular frame structure with two open ends, the box body is fixedly connected with the mounting plate (10), and the rear cover (4) and the front cover (5) are respectively and hermetically connected at the two open ends of the box body; the left side wall and the right side wall of the box body are provided with threading holes, rubber plugs (14) are arranged in the threading holes, and the rubber plugs (14) are of hollow structures so that cables can pass through; a wire inlet (17) used for the secondary winding lead wire (15) to pass through is arranged on the rear cover (4); the secondary outlet plate (7) is arranged in parallel with the rear cover (4) and the front cover (5).
3. Sleeve type current transformer for turbo generator set according to claim 2, characterized in that the secondary wiring stud (6) is copper; the secondary wire outlet plate (7) is made of epoxy resin, and the secondary wiring stud (6) and the secondary wire outlet plate (7) are cast into a whole.
4. Sleeve type current transformer for turbo generator set according to claim 2, characterized in that the secondary junction box (3) is made of cast aluminium material, and the top and side wall of the secondary junction box (3) are respectively provided with warning sign board (20) and grounding bolt (18).
5. Sleeve type current transformer for turbo generator set according to claim 1 or 2, characterized in that one side of the mounting plate (10) is radially provided with a boss, on which the secondary junction box (3) is fixed.
6. Sleeve type current transformer for turbo generator set according to claim 5, characterized in that the mounting plate (10) is provided with a sign frame and a sign (8) mounted on the sign frame.
7. Sleeve type current transformer for turbo generator set according to claim 1, characterized in that the secondary coil is fixed on the mounting plate (10) by means of binding bands (9).
8. The sleeve type current transformer for the turbo generator set according to claim 1, wherein the secondary coil comprises an iron core (1), a secondary winding (2) and an insulating layer, wherein the iron core (1) is of a circular ring structure, the secondary winding (2) is wound on the iron core (1), and the insulating layer is wrapped on the outer side of the secondary winding (2).
9. The sleeve type current transformer for the turbo generator set according to claim 8, wherein the secondary winding (2) comprises a main winding and a plurality of layers of shielding windings positioned on the inner side of the main winding, each layer of shielding windings is of a symmetrical structure formed by reversely winding two wires, and the two wires are connected in parallel; the two adjacent shielding windings are connected in series, and the symmetry axes are mutually perpendicular.
10. Sleeve type current transformer for turbo generator set according to claim 8, characterized in that the insulation layer comprises an insulation paint (11) and an insulation film (12) arranged from inside to outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320988289.7U CN219800652U (en) | 2023-04-27 | 2023-04-27 | Sleeve type current transformer for steam turbine generator unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320988289.7U CN219800652U (en) | 2023-04-27 | 2023-04-27 | Sleeve type current transformer for steam turbine generator unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219800652U true CN219800652U (en) | 2023-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320988289.7U Active CN219800652U (en) | 2023-04-27 | 2023-04-27 | Sleeve type current transformer for steam turbine generator unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219800652U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117524511A (en) * | 2024-01-04 | 2024-02-06 | 陕西星环聚能科技有限公司 | Reflux coil assembly and toroidal field coil structure |
-
2023
- 2023-04-27 CN CN202320988289.7U patent/CN219800652U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117524511A (en) * | 2024-01-04 | 2024-02-06 | 陕西星环聚能科技有限公司 | Reflux coil assembly and toroidal field coil structure |
| CN117524511B (en) * | 2024-01-04 | 2024-04-05 | 陕西星环聚能科技有限公司 | Reflux coil assembly and toroidal field coil structure |
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