CN214624645U - Current transformer with low-voltage shielding - Google Patents
Current transformer with low-voltage shielding Download PDFInfo
- Publication number
- CN214624645U CN214624645U CN202120496837.5U CN202120496837U CN214624645U CN 214624645 U CN214624645 U CN 214624645U CN 202120496837 U CN202120496837 U CN 202120496837U CN 214624645 U CN214624645 U CN 214624645U
- Authority
- CN
- China
- Prior art keywords
- insulator
- primary
- current transformer
- shielding
- terminal
- 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.)
- Active
Links
Images
Abstract
The utility model discloses a current transformer with low voltage shielding, relating to the technical field of high voltage measurement and protection of electric power systems; the coil body is arranged in the insulator in a sealing mode, one end of the insulator is provided with a primary wiring terminal P1 and a primary wiring terminal P2, the other end of the insulator is provided with a secondary wiring terminal, the insulator is of an integrated structure formed by pouring epoxy resin, and an aluminum powder shielding layer is sprayed on the outer surface of the insulator. The novel electric power system switch cabinet is formed by vacuum casting of epoxy resin, has the advantages of small volume, large creepage distance, high dynamic and thermal stability current, high metering precision, moisture resistance, condensation resistance and electricity larceny prevention, and can be widely applied to the transformation of a power system switch cabinet and a newly designed switch cabinet.
Description
Technical Field
The utility model relates to an electric power system high pressure is measured and is protected technical field, concretely relates to take low pressure shielding current transformer.
Background
A current transformer for a 35kV solid insulation cabinet is equipment for measuring current, electric energy or relay protection in a solid switch cabinet of a power system, the current transformer for the solid insulation cabinet used in the power system at present is a totally-enclosed outer-sleeved aluminum shell structure (namely a structure that a primary winding, a secondary winding, an iron core and other components are cast into an integral insulator and an aluminum shell is sleeved outside the integral insulator), but has the defects of small volume, low winding precision, low load, complex processing technique of the aluminum shell, easy discharge of a gap between the aluminum shell and a casting body after the aluminum shell is sleeved, short service life, low partial discharge qualification rate and the like, and the product performance is prolonged along with the service time, the precision and the insulation are reduced to different degrees, which becomes the hidden trouble of the safe operation of the equipment in the power system, the problems always puzzle the design and maintenance personnel of the electric power system and become the problem which is urgently solved in the upgrading, transformation and development of the current transformer for the 35kV solid cabinet of the electric power system.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a take low pressure shielding current transformer to solve current 35kV current transformer for solid insulated cabinets precision low, the load is low, the partial discharge qualification rate is low, life weak point scheduling problem.
In order to achieve the purpose, the technical scheme of the application is as follows: the utility model provides a take low pressure shielding current transformer, includes the insulator and seals and arrange in coil ware body in the insulator, insulator one end is equipped with once binding post P1 and once binding post P2, and the insulator other end is equipped with secondary binding post, the insulator adopts epoxy to pour into a mould formula structure as an organic whole into, and the surface spraying has the aluminium powder shielding layer.
Further, the peripheries of the primary wiring terminal P1 and the primary wiring terminal P2 are both connected with a low-voltage primary shielding ring.
Further, the aluminum powder shielding layer is in contact with the embedded nut on the low-voltage primary shielding ring.
Further, the primary connection terminals at one end of the insulator are a contact type primary connection terminal P1 and a contact type primary connection terminal P2.
Further, the primary connection terminal P1 and the primary connection terminal P2 are vertically arranged.
Furthermore, the inner side of the secondary wiring terminal is connected with a ground screen voltage-sharing net.
Furthermore, a secondary wiring cover is arranged on the outer side of the secondary wiring terminal, and a semicircular wire outlet hole is formed in the side face of the secondary wiring cover.
Furthermore, the secondary wiring cover is made of transparent materials.
As a further example, the coil body includes an iron core, a primary winding and a secondary winding, wherein the secondary winding is wound around the iron core, the primary winding is connected to the secondary winding in a sleeving manner, and two ends of the primary winding are respectively connected to the primary connection terminal P1 and the primary connection terminal P2.
As a further step, the insulator has a square configuration.
The utility model discloses owing to adopt above technical scheme, can gain following technological effect:
1. small, the installation is nimble: this application forms and spouts the integrative structure of aluminite powder for the surface through epoxy vacuum casting, and inside the insulator was arranged in to the iron core seal, optimization structural design, product small, light in weight, partial discharge are effectual, long service life, can install in a flexible way in 35kV solid cabinet, use as electric current, electric energy measurement and relay protection.
2. The dynamic and thermal stability current is high, and the metering accuracy is high: the application has high primary dynamic thermal stability current, and can effectively avoid overhigh temperature rise and insulation damage of the mutual inductor caused by system short circuit and overcurrent.
3. Full-sealing, dampproof, prevent condensation: this application wholly adopts the epoxy vacuum to water and forms, and inside all parts all sealed the insulator of arranging in, guarantee that the product has dampproofing, prevent the condensation function, the product can not appear the performance degradation phenomenon because of operational environment's humidity, condensation.
4. Transparentization for electricity larceny prevention: the secondary wiring terminal is located the secondary wiring cover that transparent material made, can make things convenient for the actual conditions of direct observation secondary wiring, and the secondary wiring cover has the lead sealing function, avoids switching the secondary line and causes the electricity stealing phenomenon.
Drawings
FIG. 1 is a three-dimensional view of a current transformer with low voltage shielding;
fig. 2 is an internal structure diagram of a current transformer with low-voltage shielding.
The sequence numbers in the figures illustrate: 1 is a primary connecting terminal P1; 2 is a primary connecting terminal P2; 3 is a secondary wiring terminal; 4 is an insulator; 5 is a low-voltage primary shielding ring; 6 is a ground screen voltage-sharing net; 7 is a secondary wiring cover; 8 is a semicircular wire outlet hole; 9 is a cover screw; 10 is an aluminum powder shielding layer; 11 is an iron core; 12 is a primary winding; 13 is a secondary winding; and 14, a nut insert.
Detailed Description
The embodiment of the present invention is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are provided, but the present invention is not limited to the following embodiments.
Example 1
As shown in fig. 1-2, the present embodiment provides a current transformer with low voltage shielding, which includes an insulator 4 and a coil body sealed in the insulator 4, wherein one end of the insulator 4 is provided with a primary connection terminal P1 and a primary connection terminal P2, the other end of the insulator 4 is provided with a secondary connection terminal 3, the insulator 4 is cast into an integral structure by epoxy resin, and an aluminum powder shielding layer 10 is sprayed on the outer surface of the insulator 4.
The coil body comprises an iron core 11, a primary winding 12 and a secondary winding 13, wherein the secondary winding 13 is wound on the iron core 11, the primary winding is connected with the secondary winding in a sleeved mode, and two ends of the primary winding are connected with a primary wiring terminal respectively.
The insulator 4 is a square structure, so that the product structure is more reasonable and the size is compact on the basis of ensuring the insulation of the internal coil and the uniform distance of an electric field. The primary connecting terminal at one end of the insulator 4 is a contact type primary connecting terminal.
Further, the contact type primary connection terminal P1 and the contact type primary connection terminal P2 are respectively provided in the vertical direction to facilitate mounting of the interfacing. The primary connection terminal P1 and the primary connection terminal P2 are provided at their outer peripheries with low-voltage primary shield rings 5, respectively. The inner side of the secondary wiring terminal is connected with a ground screen voltage-sharing net.
The insulator 4 is internally provided with a low-voltage primary shielding ring 5, and the outer surface of the insulator 4 is sprayed with aluminum powder after sand blasting to form an integral low potential, so that the close connection between a casting body and the aluminum powder is ensured, the partial discharge effect is optimal, and the service life of the product is long.
The outer side of the secondary wiring terminal 2 is provided with a secondary wiring cover 7, and the side surface of the secondary wiring cover 7 is provided with a semicircular wire outlet hole 8, so that the secondary lead can be led out conveniently and the electricity stealing prevention function can be realized. The secondary wiring cover 7 is made of transparent materials, can conveniently and directly observe the actual situation of secondary wiring and has the function of electricity larceny prevention.
The current transformer manufacturing process comprises the following steps:
the secondary winding 13 is uniformly wound on the circular iron core 11, the primary winding 12 is wound by using a special tool and is assisted in binding insulating materials, and after the secondary winding 13 is buffered and bound, a coil body with a primary wiring terminal P1, a primary wiring terminal P2, the primary winding 12, the secondary winding 13 and a secondary wiring terminal 3 is formed; the secondary winding 13 is fixed on the mould, the primary winding 12 is fixed on the mould through a primary wiring terminal P1 and a primary wiring terminal P2, after the distance is adjusted, the secondary winding is formed by epoxy resin vacuum pouring and curing, an integrated structure is formed therewith, finally, the secondary wiring cover 7 adopts the cover screw 9 to seal the secondary wiring terminal 3, when a user uses the secondary wiring cover, the actual situation of secondary wiring can be conveniently and directly observed, the cover screw 9 and the secondary wiring cover 7 are provided with a lead sealing hole, and a semicircular wire outlet hole 8 is formed in the side face of the secondary wiring cover, so that the secondary lead can be conveniently led out, and the secondary wiring cover has an electricity stealing prevention function.
The casting body for encapsulating the primary winding 12 and the secondary winding 13 is a cuboid, and one end of the casting body is in a contact form, so that the use requirement of a solid cabinet is effectively met; on the basis of ensuring the insulation of the internal coil and the uniform distance of an electric field, the product has more reasonable structure and compact size; the aluminum powder shielding layer 10 sprayed on the surface of the casting body is connected with the low-voltage primary shielding ring 5 to effectively shield high voltage, so that the surface of the casting body is low voltage.
When the intelligent cabinet is used, the mutual inductor installation insert is fixed with the installation hole of the cabinet body through the connecting piece, and then the primary bus and the secondary cable are electrically and mechanically connected. And finally, installing the secondary wiring cover, namely completing the installation.
The current transformer for the solid cabinet is a new product designed completely according to national standards, adopts a coiled iron core, utilizes an electromagnetic conversion principle, enables secondary current to accurately reflect the change condition of primary current to be measured, and transmits the change condition to a secondary metering and controlling device; the product is directly installed in a 35kV solid cabinet and used for current and electric energy measurement and relay protection.
The invention is formed by vacuum casting of epoxy resin, has small volume, high dynamic and thermal stability current, high metering precision, moisture resistance, condensation resistance and electricity larceny prevention, and can be widely applied to the transformation of a switch cabinet of a power system and a newly designed switch cabinet.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The utility model provides a take low pressure shielding current transformer, its characterized in that includes the insulator and seals and arranges in the body of coil ware in the insulator, insulator one end is equipped with once binding post P1 and once binding post P2, and the insulator other end is equipped with secondary binding post, the insulator adopts epoxy to pour into a mould formula structure as an organic whole and the surface spraying has the aluminium powder shielding layer, the aluminium powder shielding layer contacts with the inlay dress nut on the low pressure shielding ring once.
2. The current transformer with low voltage shielding of claim 1, wherein a low voltage primary shielding ring is connected to the outer peripheries of the primary connection terminal P1 and the primary connection terminal P2.
3. The current transformer with low voltage shielding according to claim 1, wherein the primary terminals at one end of the insulator are a contact type primary terminal P1 and a contact type primary terminal P2.
4. The current transformer with low voltage shielding according to claim 1 or 3, wherein the primary connection terminal P1 and the primary connection terminal P2 are vertically arranged.
5. The current transformer with low voltage shielding according to claim 1, wherein the inner side of the secondary terminal is connected with a ground screen voltage-sharing net.
6. The current transformer with the low-voltage shielding function according to claim 1, wherein a secondary wiring cover is arranged on the outer side of the secondary wiring terminal, and a semicircular wire outlet hole is formed in the side surface of the secondary wiring cover.
7. The current transformer with low voltage shielding of claim 6, wherein the secondary wiring cover is made of transparent material.
8. The current transformer with low voltage shielding according to claim 1, wherein the body of the coil comprises an iron core, a primary winding and a secondary winding, wherein the secondary winding is wound on the iron core, the primary winding is sleeved with the secondary winding, and two ends of the primary winding are respectively connected with the primary connecting terminal P1 and the primary connecting terminal P2.
9. The current transformer with low voltage shielding according to claim 1, wherein the insulator has a square structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120496837.5U CN214624645U (en) | 2021-03-09 | 2021-03-09 | Current transformer with low-voltage shielding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120496837.5U CN214624645U (en) | 2021-03-09 | 2021-03-09 | Current transformer with low-voltage shielding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214624645U true CN214624645U (en) | 2021-11-05 |
Family
ID=78393939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120496837.5U Active CN214624645U (en) | 2021-03-09 | 2021-03-09 | Current transformer with low-voltage shielding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214624645U (en) |
-
2021
- 2021-03-09 CN CN202120496837.5U patent/CN214624645U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202502890U (en) | Indoor cabled voltage transformer for electric locomotive | |
| CN102623153B (en) | A kind of current transformer insulating sleeve | |
| CN209357607U (en) | Wall-penetrating type Full-closed current transformer | |
| CN101308725B (en) | Dry-type voltage inductor for metering cart user | |
| CN201556523U (en) | High voltage dry type current transformer with protecting gap | |
| CN201036153Y (en) | Backbone type bus current mutual inductor | |
| CN214624645U (en) | Current transformer with low-voltage shielding | |
| CN209487300U (en) | The outer open-close type low-voltage current mutual inductor of intelligent distribution transforming user | |
| CN201927472U (en) | Voltage transformer with fuse for gas insulated cabinet | |
| CN209281982U (en) | Indoor three-phase electronic current transformer | |
| CN207068637U (en) | Indoor support type current transformer | |
| CN111863508A (en) | One-time and two-time depth integrated circuit breaker on connection column | |
| CN201036151Y (en) | Backbone type totally-enclosed current mutual inductor | |
| CN207068636U (en) | A kind of indoor support type current transformer | |
| CN205004161U (en) | Take integrated current transformer of contact box modularization | |
| CN209281980U (en) | Solid cabinet Current Transformer | |
| CN209357549U (en) | Outdoor compound insulation current transformer | |
| CN210403493U (en) | Combined voltage transformer with zero sequence voltage output function | |
| CN203552921U (en) | Voltage transformer provided with plum blossom contact device and used for wheelbarrow | |
| CN207800341U (en) | A kind of band busbar wall-penetrating type current transformer | |
| CN201035064Y (en) | Through wall type totally enclosed current mutual inductor | |
| CN111354538A (en) | Current transformer for solid cabinet | |
| CN202816638U (en) | Voltage transformer for negative control terminal power | |
| CN216698013U (en) | Dry electromagnetic current mutual inductor | |
| CN217606679U (en) | Feed-through low partial discharge current transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |