CN116469661A - Outdoor closed zero sequence current transformer - Google Patents
Outdoor closed zero sequence current transformer Download PDFInfo
- Publication number
- CN116469661A CN116469661A CN202210030659.6A CN202210030659A CN116469661A CN 116469661 A CN116469661 A CN 116469661A CN 202210030659 A CN202210030659 A CN 202210030659A CN 116469661 A CN116469661 A CN 116469661A
- Authority
- CN
- China
- Prior art keywords
- insulator
- junction box
- bottom plate
- current transformer
- sequence current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000012212 insulator Substances 0.000 claims abstract description 35
- 238000004804 winding Methods 0.000 claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003822 epoxy resin Substances 0.000 claims abstract description 8
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 abstract description 7
- 238000009434 installation Methods 0.000 description 7
- 238000005266 casting Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
-
- 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
-
- 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
- H01F2038/305—Constructions with toroidal magnetic core
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention relates to a high-voltage protection device of a power system, in particular to an outdoor closed zero-sequence current transformer. The device comprises a bottom plate and a secondary insulator arranged on the bottom plate, wherein the secondary insulator is of an annular structure with a primary bus port in the center, a secondary junction box is arranged at the bottom of the front end of the secondary insulator, and the secondary junction box and the secondary insulator are integrally cast by epoxy resin; an annular iron core and a secondary winding wound on the annular iron core are sealed in the secondary insulator; the secondary junction box is internally provided with a secondary junction terminal. The invention adopts a closed structure, is firm and reliable and has stable performance; the secondary junction box and the secondary insulator are cast together, so that the secondary junction box has enough sealing performance, and is dustproof, anti-electricity-theft and waterproof.
Description
Technical Field
The invention relates to a high-voltage protection device of a power system, in particular to an outdoor closed zero-sequence current transformer.
Background
With the high-speed increase of the power consumption of China, the capacity-increasing transformation and new construction of substations of 10kV and below, the current transformers matched with the power consumption are also used in a large scale, and especially the demands on outdoor zero-sequence current transformers are increasing. However, most zero sequence current transformers in the current market have the problems of poor sealing performance, easy water seepage, easy electricity stealing, electric leakage, poor safety and the like.
Disclosure of Invention
Aiming at the problems, the invention aims to provide an outdoor closed zero sequence current transformer so as to solve the complex problems of easiness in water seepage, easiness in electricity stealing, easiness in electricity leakage and the like of the secondary end of an outdoor bus type current transformer of the existing power system.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an outdoor closed zero sequence current transformer comprises a bottom plate and a secondary insulator arranged on the bottom plate, wherein the secondary insulator is of an annular structure with a primary bus opening in the center, a secondary junction box is arranged at the bottom of the front end of the secondary insulator, and the secondary junction box and the secondary insulator are integrally cast by epoxy resin;
an annular iron core and a secondary winding wound on the annular iron core are sealed in the secondary insulator; the secondary junction box is internally provided with a secondary junction terminal.
And the lower end of the side part of the secondary insulator is provided with a grounding bolt.
And a secondary winding bracket which is positioned below the secondary winding and used for supporting the secondary winding is arranged in the secondary insulator in a sealing way, and the secondary winding bracket is connected with the bottom plate.
The front end of the secondary junction box is provided with a secondary white steel label, and the side wall of the secondary junction box is provided with a waterproof joint.
The bottom plate is of a rectangular structure, a protrusion is arranged at the center of the bottom plate upwards, and the secondary insulator is arranged on the protrusion; and mounting holes are formed in two sides of the bottom plate.
The invention has the following advantages and beneficial effects:
1. the invention has the advantages of small volume, light weight, simple installation and disassembly and convenient maintenance;
2. the insulating material adopts a high-temperature resistant, ageing resistant and dustproof epoxy resin full casting mode, and has the characteristic of long service life;
3. the closed structure of the invention is firm, reliable and stable in performance;
4. the invention has the sealing structure measures: the secondary junction box and the secondary insulator are cast together, so that the secondary junction box has enough sealing performance, and is dustproof, anti-electricity-theft and waterproof.
Drawings
Fig. 1 is a front view of an outdoor closed zero sequence current transformer of the present invention;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
in the figure: 1 is an annular iron core; 2 is a secondary winding; 3 is a secondary junction box; 4 is a bottom plate; 5 is a secondary insulator; 6 is a secondary winding bracket; 7 is a primary bus port; 8 is a mounting hole; 9 is a grounding bolt; 10 is a waterproof joint; 11 is a secondary white steel label; and 12 is a secondary wiring terminal.
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 outdoor closed zero-sequence current transformer provided by the invention comprises a bottom plate 4 and a secondary insulator 5 arranged on the bottom plate 4, wherein the secondary insulator 5 is of an annular structure with a primary bus port 7 in the center, a secondary junction box 3 is arranged at the bottom of the front end of the secondary insulator 5, and the secondary junction box 3 and the secondary insulator 5 are cast into an integrated structure by adopting epoxy resin; the secondary insulator 5 is internally provided with an annular iron core 1 and a secondary winding 2 wound on the annular iron core 1 in a sealing way; the secondary terminal block 3 is provided with a secondary terminal 12.
Further, the side lower end of the secondary insulator 5 is provided with a ground bolt 9.
As shown in fig. 3, in the embodiment of the present invention, a secondary winding bracket 6 is further enclosed in the secondary insulator 5 and located below the secondary winding 2, and is used for supporting the secondary winding 2, and the secondary winding bracket 6 is connected with the bottom plate 4.
Further, a secondary white steel label 11 is arranged at the front end of the secondary junction box 3, and a waterproof joint 10 is arranged on the side wall of the secondary junction box 3.
In the embodiment of the invention, the bottom plate 4 is of a rectangular structure, a bulge is arranged at the central position upwards, and the secondary insulator 5 is arranged on the bulge; the both sides of bottom plate 4 are equipped with mounting hole 8, and the installation of the product of being convenient for is fixed.
The invention provides an outdoor closed zero sequence current transformer, which is prepared by the following steps:
the secondary winding 2 is uniformly wound on the annular iron core 1, and a coil body with a secondary wiring terminal 12 and the secondary winding 2 is formed after binding and buffer binding by using the secondary winding bracket 6; the secondary winding 2 is fixed on a mould by a secondary winding bracket 6, and is vacuum cast and solidified by epoxy resin after the distance is adjusted, so that the secondary winding is provided with a secondary wiring terminal 12 and a secondary wiring box 3, the main body is of an integrated structure in a cylinder shape which is horizontally placed, and a circular through hole in the inner cavity of the cylinder is a primary bus opening 7. The bottom plate 4 is fixed on the bottom surface of the secondary insulator 5 by bolts, and the secondary white steel label 11 is fixed above the secondary junction box after the completion; a waterproof connector 10 is provided on the left side of the secondary terminal box 3. A ground bolt 9 is provided on the left side surface of the secondary insulator 5. The primary bus port 7 is a transition port of a primary high-voltage bus cable, and when in actual installation and use, the primary high-voltage bus cable passes through the primary bus port 7, then the transformer is installed, and the transformer bottom plate 4 is fixed at a required installation position by using bolts and nuts, so that the electrical and mechanical connection of a high-voltage circuit is completed; and then the electric and mechanical connection of the secondary cable is carried out, the secondary cable is connected with a secondary connection terminal 12 through a waterproof connector 10, and finally the secondary white steel label 11 in front of the secondary connection box 3 is installed, so that the installation is finished, and finally, the product is ensured to have a good current protection function.
The outdoor closed zero sequence current transformer provided by the invention is a new product designed completely according to the national standard, adopts a ring-shaped rolled iron core, utilizes the electromagnetic conversion principle to enable secondary current to accurately reflect the change condition of primary current protection, and transmits the secondary current to a secondary control or protection device, so that the product is directly installed in an outdoor power system of 10kV or below for relay protection.
The invention has the advantages of small volume, light weight, simple installation and disassembly and convenient maintenance; the insulating material adopts a high-temperature resistant, ageing resistant and dustproof epoxy resin full casting mode, and has the characteristic of long service life; the closed structure of the transformer is firm and reliable and has stable performance; the invention adopts the epoxy resin vacuum casting technology to cast the secondary junction box and the secondary insulator into an integrated closed structure, ensures that the secondary junction box has enough sealing performance, is dustproof, anti-electricity-theft and waterproof, and has the advantages of safe and reliable formation, stable insulation, impact vibration resistance, long maintenance period, quick installation and convenient disassembly.
The foregoing is merely an embodiment of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (5)
1. The outdoor closed zero sequence current transformer is characterized by comprising a bottom plate (4) and a secondary insulator (5) arranged on the bottom plate (4), wherein the secondary insulator (5) is of an annular structure with a primary bus port (7) in the center, a secondary junction box (3) is arranged at the bottom of the front end of the secondary insulator (5), and the secondary junction box (3) and the secondary insulator (5) are integrally cast by epoxy resin;
an annular iron core (1) and a secondary winding (2) wound on the annular iron core (1) are sealed in the secondary insulator (5); a secondary wiring terminal (12) is arranged in the secondary wiring box (3).
2. Outdoor closed zero sequence current transformer according to claim 1, characterized in that the side lower end of the secondary insulator (5) is provided with a grounding bolt (9).
3. An outdoor closed zero sequence current transformer according to claim 1, characterized in that a secondary winding bracket (6) which is positioned below the secondary winding (2) and is used for supporting the secondary winding (2) is sealed in the secondary insulator (5), and the secondary winding bracket (6) is connected with the bottom plate (4).
4. The outdoor closed zero sequence current transformer according to claim 1, wherein the front end of the secondary junction box (3) is provided with a secondary white steel label (11), and the side wall of the secondary junction box (3) is provided with a waterproof joint (10).
5. The outdoor closed zero sequence current transformer according to claim 1, wherein the bottom plate (4) is of a rectangular structure, a protrusion is arranged upwards in the center position, and the secondary insulator (5) is arranged on the protrusion; mounting holes (8) are formed in two sides of the bottom plate (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210030659.6A CN116469661A (en) | 2022-01-12 | 2022-01-12 | Outdoor closed zero sequence current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210030659.6A CN116469661A (en) | 2022-01-12 | 2022-01-12 | Outdoor closed zero sequence current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116469661A true CN116469661A (en) | 2023-07-21 |
Family
ID=87174010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210030659.6A Pending CN116469661A (en) | 2022-01-12 | 2022-01-12 | Outdoor closed zero sequence current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116469661A (en) |
-
2022
- 2022-01-12 CN CN202210030659.6A patent/CN116469661A/en active Pending
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