CN216250270U - Three-phase four-wire combined transformer for outdoor 10kV line metering - Google Patents
Three-phase four-wire combined transformer for outdoor 10kV line metering Download PDFInfo
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- CN216250270U CN216250270U CN202122497191.5U CN202122497191U CN216250270U CN 216250270 U CN216250270 U CN 216250270U CN 202122497191 U CN202122497191 U CN 202122497191U CN 216250270 U CN216250270 U CN 216250270U
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Abstract
The utility model discloses a three-phase four-wire combined transformer for outdoor 10kV line metering, which comprises an installation base, a current transformer and a voltage transformer, wherein a neutral point terminal is arranged on the upper surface outside the installation base; the current transformer comprises a current primary coil, a current secondary coil and a current iron core, and the current primary wiring board and the current secondary wiring board are respectively connected with the current primary coil; the voltage transformer comprises a primary voltage high-voltage coil, a secondary voltage low-voltage coil and a C-shaped voltage iron core, wherein the primary voltage high-voltage coil penetrates through and is wound and fixed on the secondary voltage low-voltage coil, the voltage iron core comprises an inner framework and an outer framework, the secondary voltage low-voltage coil is wound and fixed on the inner framework, and the primary voltage high-voltage coil is wound and fixed on the outer framework.
Description
Technical Field
The utility model belongs to the technical field of instrument transformers, and particularly relates to a three-phase four-wire combined transformer for outdoor 10kV line metering.
Background
The mutual inductor is also called instrument transformer, and is a general name of current mutual inductor and voltage mutual inductor. The high voltage can be changed into low voltage, and the large current can be changed into small current for measuring or protecting the system. Its function is mainly to convert high voltage or large current into standard low voltage (rated value 100V) or standard small current (rated value 5A or 1A) in proportion so as to implement standardization and miniaturization of measuring instrument, protective equipment and automatic control equipment. Meanwhile, the mutual inductor can be used for isolating a high-voltage system so as to ensure the safety of people and equipment.
The existing combined transformer has a simple structure: firstly, a voltage transformer and a current transformer are mostly arranged in a single structure, and large power load change and high self no-load loss of a transformer power system are not considered, so that inaccuracy of data metering is easily caused; secondly, no insulating layer is sprayed on the surfaces of the voltage transformer and the current transformer, so that the insulating property of the transformer is poor, and meanwhile, the ageing resistance and the corrosion resistance of the transformer are poor, so that the use protection requirements cannot be met; thirdly, the general split type installation of traditional voltage transformer and current transformer is fixed on the base, although firm in connection, inconvenient assembly and disassembly, and the unable independent change of mutual-inductor is maintained simultaneously, and the inefficiency of construction or maintenance can not satisfy the integral erection requirement.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a three-phase four-wire combined transformer for outdoor 10kV line metering.
The technical scheme provided by the utility model is as follows:
a three-phase four-wire combined transformer for outdoor 10kV line metering comprises a mounting base, a current transformer and a voltage transformer, wherein the voltage transformer is fixedly arranged on the lower surface inside the mounting base, the current transformer is fixedly arranged on the upper surface outside the mounting base, and a neutral point terminal is arranged on the upper surface outside the mounting base; an epoxy resin shell is respectively molded outside the current transformer and the voltage transformer in a casting mode, and a silicon rubber composite insulating layer is coated outside the epoxy resin shell; the upper end of the epoxy resin shell is fixedly connected with a wiring board, and the wiring board comprises a current primary wiring board and a current secondary wiring board;
the current transformer comprises a current primary coil, a current secondary coil and a current iron core, and the current primary wiring board and the current secondary wiring board are respectively connected with the current primary coil; the current primary coil is wound and fixed on the current secondary coil, the current secondary coil is wound and fixed on the current iron core, and the current secondary coil is connected with a current secondary terminal through a lead;
the voltage transformer comprises a primary voltage high-voltage coil, a secondary voltage low-voltage coil and a C-shaped voltage iron core, wherein the primary voltage high-voltage coil penetrates through, is wound and fixed on the secondary voltage low-voltage coil, the voltage iron core comprises an inner framework and an outer framework, the secondary voltage low-voltage coil is wound and fixed on the inner framework, and the primary voltage high-voltage coil is wound and fixed on the outer framework; the voltage primary high-voltage coil is connected with the current primary coil and the neutral point terminal through leads respectively, and the voltage secondary low-voltage coil is connected with a voltage secondary terminal through a lead;
the current secondary terminal and the voltage secondary terminal are both arranged inside the installation base.
Furthermore, a plurality of voltage transformers and current transformers are correspondingly arranged, the current transformers are connected in series through conducting wires, and the voltage transformers are independently arranged.
Further, the inside bottom mounting of installation base is provided with seal structure, current secondary terminal and voltage secondary terminal all fixed set up in inside the seal structure.
Furthermore, handles are symmetrically and fixedly connected to two ends of the outer side of the mounting base.
Furthermore, a plurality of hanging rings are fixedly arranged on the outer side edge of the mounting base.
Furthermore, the current iron core is made of an iron-based microcrystalline alloy material.
The utility model has the beneficial effects that:
(1) the voltage transformer is provided with a plurality of current transformers and corresponding voltage transformers, and voltage iron cores of the voltage transformers are arranged in a C shape, so that a primary voltage coil and a secondary voltage coil are respectively and simultaneously wound on an outer framework and an inner framework of the voltage iron cores, flexible installation is facilitated for constructors, no-load loss of the voltage transformers is reduced, and accuracy of metering is guaranteed;
(2) the neutral point terminal N is arranged on the upper surface of the outer part of the mounting base, so that the wiring can be carried out during testing, and the detection is convenient; in addition, the voltage primary high-voltage coil of each phase voltage transformer is respectively led to the neutral point terminal N, so that the capacity and the precision of each phase voltage transformer can be detected, and the single-phase test requirements of instruments of a calibration department are met;
(3) the transformer has the advantages of high strength, corrosion resistance, aging resistance, environmental protection and the like;
(4) the utility model operates in a 10kV voltage system, and the arranged combined mutual inductors are distributed inside and outside the mounting base to form an integrated structure, thereby ensuring the integral stability and being convenient to assemble and disassemble, and improving the construction and maintenance efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a three-phase four-wire combined transformer for outdoor 10kV line metering according to the utility model;
FIG. 2 is a wiring diagram of a current transformer of the three-phase four-wire combined transformer for outdoor 10kV line metering according to the utility model;
FIG. 3 is a wiring diagram of a voltage transformer of the three-phase four-wire combined transformer for outdoor 10kV line metering according to the utility model;
fig. 4 is a top view of fig. 1.
In the figure: 1. a wiring board; 101. a current primary wiring board; 102. a current secondary wiring board; 2. an epoxy resin housing; 3. a silicone rubber composite insulating layer; 4. a current primary coil; 5. a current secondary coil; 6. a current core; 7. a voltage primary high voltage coil; 8. a voltage core; 9. a voltage secondary low voltage coil; 10. a neutral point terminal; 11. a current secondary terminal; 12. a voltage secondary terminal; 13. a sealing structure; 14. installing a base; 15. a handle; 16. a lifting ring.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
It should be noted that in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.
Example 1
As shown in fig. 1 to 4, the three-phase four-wire combined transformer for outdoor 10kV line metering comprises a mounting base 14, a current transformer and a voltage transformer, wherein the voltage transformer is fixedly arranged on the lower surface inside the mounting base 14, the current transformer is fixedly arranged on the upper surface outside the mounting base 14, and a neutral point terminal 10 is arranged on the upper surface outside the mounting base 14. An epoxy resin shell 2 is respectively molded outside the current transformer and the voltage transformer in a casting mode, and a silicon rubber composite insulating layer 3 is coated outside the epoxy resin shell 2; a wiring board 1 is fixedly connected to the upper end of the epoxy resin casing 2, and the wiring board 1 comprises a current primary wiring board 101 and a current secondary wiring board 102.
The current transformer comprises a current primary coil 4, a current secondary coil 5 and a current iron core 6, and the current primary wiring board 101 and the current secondary wiring board 102 are respectively connected with the current primary coil 4; the current primary coil 4 is wound and fixed on the current secondary coil 5, the current secondary coil 5 is wound and fixed on the current iron core 6, and the current secondary coil 5 is connected with a current secondary terminal 11 through a lead.
The voltage transformer comprises a primary voltage high-voltage coil 7, a secondary voltage low-voltage coil 9 and a C-shaped voltage iron core 8, wherein the primary voltage high-voltage coil 7 penetrates through, is wound and fixed on the secondary voltage low-voltage coil 9, the voltage iron core 8 comprises an inner framework and an outer framework, the secondary voltage low-voltage coil 9 is wound and fixed on the inner framework, and the primary voltage high-voltage coil 7 is wound and fixed on the outer framework; the voltage primary high-voltage coil 7 is respectively connected with the current primary coil 4 and the neutral point terminal 10 through leads, and the voltage secondary low-voltage coil 9 is connected with the voltage secondary terminal 12 through leads.
The current secondary terminal 11 and the voltage secondary terminal 12 are both disposed inside the mounting base 14.
Further, voltage transformer and current transformer correspond and are provided with three, concatenate through the wire between the current transformer, independently set up between the voltage transformer.
Further, in the present embodiment, a sealing structure 13 is fixedly disposed at the bottom end inside the mounting base 14, the current secondary terminal 11 and the voltage secondary terminal 12 are both fixedly disposed inside the sealing structure 13, and the sealing structure 13 is used for preventing water from entering the current secondary terminal 11 and the voltage secondary terminal 12 to cause safety accidents.
Further, the two ends of the outer side of the mounting base 14 are symmetrically and fixedly connected with handles 15, and the handles 15 are convenient for carrying the mounting base 14.
Further, in this embodiment, a plurality of hanging rings 16 are fixedly disposed on the outer side of the mounting base 14, and the hanging rings 16 are convenient for hanging the mounting base 14.
Further, the current iron core 6 is made of iron-based microcrystalline alloy, so that the sensitivity of current testing is improved, and the load current is effectively monitored.
The working principle of the utility model is as follows: 1) the primary current enters the current primary coil 4 through the current primary wiring board 1011 and then exits from the current secondary wiring board 1021; 2) when primary current passes through the current primary coil 4, the current iron core 6 forms an induction magnetic field through the action of electromagnetic induction, so that the current secondary coil 5 induces a standard current signal, and the current signal is introduced into equipment or a device through the current secondary terminal 11 to obtain metering data; 3) the voltage primary coil is connected with the current primary coil 4 to introduce a high-voltage signal, the high voltage forms an alternating magnetic field in the C-shaped voltage iron core 8, so that the voltage secondary coil induces a standard secondary low voltage, and the standard secondary low voltage is introduced into equipment or a device through a voltage secondary terminal 12 to obtain metering data.
The combined transformer in the embodiment adopts a JLSZW-10WY model, and the technical parameters are as follows:
in the embodiment, the LSZW-10WY type combined transformer is suitable for various transformer distribution substations of urban networks, rural networks, outdoor substations and industrial enterprises, and can be used for three-phase lines with the alternating current of 50Hz and the rated voltage of 10kV or below; it can also be used for measuring voltage, current and electric energy and protecting relay.
The combined transformer adopts an integrated structure, and is convenient to assemble and disassemble; the surfaces of the voltage and current transformers are subjected to insulation treatment by adopting silicon rubber, so that the surfaces of the voltage and current transformers are anti-aging and corrosion-resistant; the three-phase voltage coil forms star connection, neutral point terminals of the three-phase voltage coil are respectively led to the surface of the combined transformer, three-phase measurement can be carried out, three single-phase measurement can also be carried out respectively, and the three-phase voltage coil has good application prospect.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention can be made by those skilled in the art without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (6)
1. A three-phase four-wire combined transformer for outdoor 10kV line metering comprises a mounting base (14), a current transformer and a voltage transformer, and is characterized in that the voltage transformer is fixedly arranged on the lower surface inside the mounting base (14), the current transformer is fixedly arranged on the upper surface outside the mounting base (14), and a neutral point terminal (10) is arranged on the upper surface outside the mounting base (14); the current transformer and the voltage transformer are respectively molded with an epoxy resin shell (2) by casting, and a silicon rubber composite insulating layer (3) is coated outside the epoxy resin shell (2); the upper end of the epoxy resin shell (2) is fixedly connected with a wiring board (1), and the wiring board (1) comprises a current primary wiring board (101) and a current secondary wiring board (102);
the current transformer comprises a current primary coil (4), a current secondary coil (5) and a current iron core (6), and the current primary wiring board (101) and the current secondary wiring board (102) are respectively connected with the current primary coil (4); the current primary coil (4) is wound and fixed on the current secondary coil (5), the current secondary coil (5) is wound and fixed on the current iron core (6), and the current secondary coil (5) is connected with a current secondary terminal (11) through a lead;
the voltage transformer comprises a primary voltage high-voltage coil (7), a secondary voltage low-voltage coil (9) and a C-shaped voltage iron core (8), wherein the primary voltage high-voltage coil (7) penetrates through, is wound and fixed on the secondary voltage low-voltage coil (9), the voltage iron core (8) comprises an inner framework and an outer framework, the secondary voltage low-voltage coil (9) is wound and fixed on the inner framework, and the primary voltage high-voltage coil (7) is wound and fixed on the outer framework; the voltage primary high-voltage coil (7) is connected with the current primary coil (4) and the neutral point terminal (10) through leads respectively, and the voltage secondary low-voltage coil (9) is connected with a voltage secondary terminal (12) through a lead;
the current secondary terminal (11) and the voltage secondary terminal (12) are both arranged inside the mounting base (14).
2. The outdoor 10kV line metering three-phase four-wire combined transformer as claimed in claim 1, wherein a plurality of voltage transformers and current transformers are correspondingly arranged, the current transformers are connected in series through conducting wires, and the voltage transformers are independently arranged.
3. An outdoor 10kV line metering three-phase four-wire combined transformer according to claim 1, characterized in that a sealing structure (13) is fixedly arranged at the bottom end inside the mounting base (14), and the current secondary terminal (11) and the voltage secondary terminal (12) are fixedly arranged inside the sealing structure (13).
4. The outdoor 10kV line metering three-phase four-wire combined transformer as claimed in claim 1, wherein handles (15) are symmetrically and fixedly connected to two ends of the outer side of the mounting base (14).
5. The outdoor 10kV line metering three-phase four-wire combined transformer as claimed in claim 1, wherein a plurality of lifting rings (16) are fixedly arranged on the outer side edge of the mounting base (14).
6. The outdoor 10kV line metering three-phase four-wire combined transformer as claimed in claim 1, wherein the current iron core (6) is made of an iron-based microcrystalline alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122497191.5U CN216250270U (en) | 2021-10-18 | 2021-10-18 | Three-phase four-wire combined transformer for outdoor 10kV line metering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122497191.5U CN216250270U (en) | 2021-10-18 | 2021-10-18 | Three-phase four-wire combined transformer for outdoor 10kV line metering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216250270U true CN216250270U (en) | 2022-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122497191.5U Active CN216250270U (en) | 2021-10-18 | 2021-10-18 | Three-phase four-wire combined transformer for outdoor 10kV line metering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216250270U (en) |
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2021
- 2021-10-18 CN CN202122497191.5U patent/CN216250270U/en active Active
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