CN219267456U

CN219267456U - Residual current transformer

Info

Publication number: CN219267456U
Application number: CN202320731136.4U
Authority: CN
Inventors: 沈云杰; 冯长泳; 顾仲炜
Original assignee: Zhejiang Enhong Electronics Co ltd
Current assignee: Zhejiang Enhong Electronics Co ltd
Priority date: 2023-04-04
Filing date: 2023-04-04
Publication date: 2023-06-27
Anticipated expiration: 2033-04-04

Abstract

The utility model relates to the technical field of transformers, in particular to a residual current transformer, which comprises a plastic shell, a plastic cover, a magnetic core, a coil and a primary copper piece, wherein the coil is wound on the magnetic core, the coil is arranged in the plastic shell, the primary copper piece passes through the center of the coil, two ends of the primary copper piece extend to the outside of the plastic shell, a phosphor copper needle is connected to the primary copper piece in the plastic shell, the phosphor copper needle extends to the outside of the plastic shell, two secondary guide needles are connected to the coil, the secondary guide needles extend to the outside of the plastic shell, and the plastic cover is arranged on the plastic shell. According to the residual current transformer, the phosphorus copper needle is connected to the primary copper piece, so that the residual current transformer can be used for collecting voltage signals, is suitable for an Internet of things meter, is connected with the secondary guide needle, and is positioned through the first fixed block, so that the hard connection of the transformer is realized, the installation convenience of the transformer can be improved, and meanwhile, the internal structure of the Internet of things meter is more compact.

Description

Residual current transformer

Technical Field

The utility model relates to the technical field of transformers, in particular to a residual current transformer.

Background

The current transformer is a key component in the ammeter and is mainly used for measuring the actual current flowing through the ammeter and completing the collection and calculation of electric energy together with a voltage collection device in the ammeter.

At present, most of input and output ends of the current transformer are in soft wire form, so that threading connection is facilitated. But in the actual use, adopt the patchcord as input/output, its installation in the ammeter is comparatively troublesome, generally need connect through modes such as welding, and the connection fastness is poor, influences the ammeter normal use. In addition, the use of wire assembly results in a large space required for assembly, making the meter less compact.

Meanwhile, the existing current transformer cannot sample voltage signals.

Disclosure of Invention

The utility model provides a residual current transformer for solving the technical defects, which is suitable for sampling residual current of an Internet of things meter so as to identify the residual current of a live wire and a zero wire and sample voltage signals.

The utility model discloses a residual current transformer which comprises a plastic shell, a plastic cover, a magnetic core, a coil and a primary copper piece, wherein the coil is wound on the magnetic core, the coil is arranged in the plastic shell, the primary copper piece passes through the center of the coil, two ends of the primary copper piece extend to the outside of the plastic shell, a phosphor copper needle is connected to the primary copper piece in the plastic shell, the phosphor copper needle extends to the outside of the plastic shell, two secondary guide needles are connected to the coil, the secondary guide needles extend to the outside of the plastic shell, the inside of the plastic shell is encapsulated by epoxy resin, and the plastic cover is arranged on the plastic shell.

The plastic shell at the corresponding position of the secondary guide pin is provided with a first slot, the secondary guide pin is provided with a first fixing block, the first fixing block is inserted into the first slot, and the first fixing block is used for positioning the secondary guide pin.

The plastic shell at the corresponding position of the phosphorus copper needle is provided with a second slot, the phosphorus copper needle is provided with a second fixing block, the second fixing block is inserted into the second slot, and the second fixing block is used for positioning the phosphorus copper needle.

A shielding sheet is arranged between the coil and the plastic shell.

The coil is sleeved on the hollow cylinder, and the primary copper piece passes through the coil from the side edge of the hollow cylinder.

The support comprises an annular bottom plate and an arc-shaped partition plate arranged at the center of the bottom plate, after the support is sleeved on the hollow cylinder, a channel is formed between the arc-shaped partition plate and the side wall of the hollow cylinder, the coil is adjusted on the hollow cylinder and the arc-shaped partition plate, and a primary copper piece penetrates through the channel between the arc-shaped partition plate and the side wall of the hollow cylinder.

According to the residual current transformer, the phosphorus copper needle is connected to the primary copper piece, so that the residual current transformer can be used for collecting voltage signals, is suitable for an Internet of things meter, is connected with the secondary guide needle, and is positioned through the first fixed block, so that the hard connection of the transformer is realized, the installation convenience of the transformer can be improved, and meanwhile, the internal structure of the Internet of things meter is more compact.

Drawings

FIG. 1 is a schematic view of the structure of the present utility model (plastic cover is not shown);

fig. 2 is an exploded view of the present utility model.

Detailed Description

In order to further describe the technical means and effects adopted by the present utility model for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present utility model with reference to the accompanying drawings and preferred embodiments.

Example 1:

as shown in fig. 1 and 2, the utility model discloses a residual current transformer, which comprises a plastic shell 1, a plastic cover 2, a magnetic core, a coil 3 and a primary copper piece 4, wherein the coil 3 is wound on the magnetic core, the coil 3 is arranged in the plastic shell 1, the primary copper piece 4 passes through the center of the coil 3, two ends of the primary copper piece 4 extend to the outside of the plastic shell 1, a phosphor copper needle 9 is connected to the primary copper piece 4 in the plastic shell 1, the phosphor copper needle 9 extends to the outside of the plastic shell 1, two secondary lead needles 7 are connected to the coil 3, the secondary lead needles 7 extend to the outside of the plastic shell 1, the inside of the plastic shell 1 is encapsulated by epoxy resin, and the plastic cover 2 is arranged on the plastic shell 1.

The primary copper piece 4 extends to the outside of the plastic shell 1, the coil 3 is connected with the secondary guide pin 7, and the secondary guide pin 7 extends to the outside of the plastic shell 1, so that the transformer is hard-connected during use and installation, the primary copper piece 4 and the secondary guide pin 7 are more conveniently connected with the internal structure of the ammeter, and especially the secondary guide pin 7 can be inserted and connected, and the use and installation efficiency is improved.

The plastic shell 1 at the corresponding position of the secondary guide pin 7 is provided with a first slot 11, the secondary guide pin 7 is provided with a first fixed block 8, the first fixed block 8 is inserted into the first slot 11, and the first fixed block 8 is used for positioning the secondary guide pin 7. The adoption of the first fixing block 8 can accurately position the two secondary guide pins 7 on the plastic shell 1, can control the stable interval between the two secondary guide pins 7, can be directly spliced in the use process, and is more accurate in alignment.

The plastic shell 1 at the corresponding position of the phosphorus copper needle 9 is provided with a second slot 12, the phosphorus copper needle 9 is provided with a second fixing block 10, the second fixing block 10 is inserted into the second slot 12, and the second fixing block 10 is used for positioning the phosphorus copper needle 9. The phosphor copper needle 9 is positioned through the second fixing block 10 so as to ensure that the position of the phosphor copper needle 9 on the plastic shell 1 is accurate, and the phosphor copper needle 9 can be directly spliced with other components when the transformer is installed.

The first fixing block 8 and the second fixing block 10 in the scheme can be respectively inserted into the first slot 11 and the second slot 12, the connection is simple, the end parts of the first slot 11 and the second slot 12 can be sealed by the plastic cover 2, the connection of the first fixing block 8 and the second fixing block 10 inside is firm and stable, and the assembly is convenient.

A shielding sheet 5 is provided between the coil 3 and the plastic case 1. The shielding sheet 5 can be arranged between the coil 3 and the plastic shell 1 according to actual requirements, and the shielding sheet 5 is used for preventing the electromagnetic outside the plastic shell 1 from interfering the coil 3, so that the measurement accuracy of the transformer is improved. Wherein the shielding sheet 5 may be arc-shaped, and may be electrical pure iron or silicon steel sheet.

The coil 3 is sleeved on the hollow cylinder 13, and the primary copper piece 4 passes through the coil 3 from the side edge of the hollow cylinder 13. The plastic shell 1 at the position corresponding to the coil 3 is provided with the hollow column 13, the hollow column 13 penetrates through the plastic shell 1 and the plastic cover 2, and in the actual use process of the transformer, if the primary copper piece 4 led out from the inside of the plastic shell 1 is positioned at one side of the plastic shell 1, and when a component connected with the primary copper piece 4 is positioned at the other side, the primary copper piece 4 can be connected by adopting the copper piece and then penetrates through the inside of the hollow column 13 to the other side of the plastic shell 1, so that the connection and the installation of the transformer are facilitated.

The support bracket 6 is sleeved on the hollow column 13 inside the plastic shell 1, the support bracket 6 comprises an annular bottom plate 61 and an arc-shaped partition plate 62 arranged at the center of the bottom plate, after the support bracket 6 is sleeved on the hollow column 13, a channel is formed between the arc-shaped partition plate 62 and the side wall of the hollow column 13, the coil 3 is regulated on the hollow column 13 and the arc-shaped partition plate 62, and the primary copper piece 4 passes through the channel between the arc-shaped partition plate 62 and the side wall of the hollow column 13. The coil 3 can be supported and protected through the support bracket 6, and meanwhile, the arc-shaped partition plate 62 can insulate and isolate the primary copper piece 4 from the coil 3, so that the insulation effect is effectively improved.

The inner shell of the transformer obtained by the embodiment is accurately measured in the range of 10 mA-120A, and the current error of secondary output reaches the requirement of 0.1 level.

The performance of the transformer obtained by the embodiment can be achieved:

1. primary and secondary windings: 4.0KV AC, 50Hz frequency, 0.5mA,60s (no breakdown, flashover).

2. The insulation resistance between the primary winding and the secondary winding is more than 1GΩ/500Vdc.

3. The current of the transformer is input into 120A and 10 omega load for 24 hours, and the accuracy of 10 mA-120A is not affected.

5. The inner shell is accurately measured within the range of 10 mA-120A, and the error of the secondary output current is less than or equal to +/-0.1% under the load of 10Ω.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be in interaction relationship with two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The present utility model is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present utility model.

Claims

1. The utility model provides a residual current transformer, includes plastic casing, plastic cover, magnetic core, coil and elementary copper spare, the coil is around establishing on the magnetic core, characterized by: the coil is arranged in the plastic shell, the primary copper piece passes through the center of the coil, the two ends of the primary copper piece extend to the outside of the plastic shell, a phosphor copper needle is connected to the primary copper piece in the plastic shell, the phosphor copper needle extends to the outside of the plastic shell, two secondary guide needles are connected to the coil, the secondary guide needles extend to the outside of the plastic shell, epoxy resin is adopted for encapsulation in the plastic shell, and a plastic cover is arranged on the plastic shell.

2. A residual current transformer according to claim 1, characterized in that: the plastic shell at the corresponding position of the secondary guide pin is provided with a first slot, the secondary guide pin is provided with a first fixing block, the first fixing block is inserted into the first slot, and the first fixing block is used for positioning the secondary guide pin.

3. A residual current transformer according to claim 2, characterized in that: the plastic shell at the corresponding position of the phosphorus copper needle is provided with a second slot, the phosphorus copper needle is provided with a second fixing block, the second fixing block is inserted into the second slot, and the second fixing block is used for positioning the phosphorus copper needle.

4. A residual current transformer according to claim 3, characterized in that: a shielding sheet is arranged between the coil and the plastic shell.

5. The residual current transformer according to claim 4, wherein: the coil is sleeved on the hollow cylinder, and the primary copper piece passes through the coil from the side edge of the hollow cylinder.

6. A residual current transformer according to claim 5, characterized in that: the support comprises an annular bottom plate and an arc-shaped partition plate arranged at the center of the bottom plate, after the support is sleeved on the hollow cylinder, a channel is formed between the arc-shaped partition plate and the side wall of the hollow cylinder, the coil is adjusted on the hollow cylinder and the arc-shaped partition plate, and a primary copper piece penetrates through the channel between the arc-shaped partition plate and the side wall of the hollow cylinder.