CN213750057U - Current transformer and electric energy meter applying same - Google Patents

Abstract

The utility model discloses a current transformer, including main part, the elementary lead wire and the sampling line that are provided with secondary coil, elementary lead wire passes in the main part, secondary coil cover is established outside the part that elementary lead wire is located the main part, its characterized in that: the current transformer further comprises a plug connector component, the plug connector component comprises a first plug connector, one end of the sampling line is fixed to the first plug connector, the other end of the sampling line is fixed to the main body, and the fixed end of the sampling line and the fixed end of the main body extend into the main body and can be connected with the secondary coil. The utility model also discloses an electric energy meter who uses above-mentioned current transformer. Compared with the prior art, the utility model has the advantages of: by fixing the end part of the sampling line, automatic welding can be realized, the producibility is higher, and the automatic welding device can be used for automatic production.

Description

Current transformer and electric energy meter applying same

Technical Field

The utility model belongs to the technical field of the power terminal technique and specifically relates to a current transformer to and use the electric energy meter that has this current transformer.

Background

With the rapid development of economy, the automation and intelligence of production and life are more and more depended on by people, and the demand for electric power cannot be kept away. The scale of the power terminal is also continuously expanding as a ring of the grid terminal.

An electric power terminal product, such as an electric energy meter, is a metering tool for metering electric energy, and a terminal box is an important component of the electric energy meter. In the power industry, southern power grids require the function of electricity larceny prevention for terminal products, and most of the electricity larceny prevention structures used at present are electricity larceny prevention CTs (current transformers). The primary side of the anti-electricity-theft CT used by the southern power grid terminal is welded on a current terminal of a terminal box, namely the terminal box and the anti-electricity-theft CT are integrated, and a current terminal and an anti-electricity-theft terminal are led out from the secondary side of each phase of CT.

The current transformer for the intelligent electric energy meter, disclosed in the chinese patent with the application number of 201821889734.X of the present applicant, comprises a current transformer body and two sampling lines wound together and arranged on the current transformer body, wherein a protective sleeve is further sleeved outside the two sampling lines. Also, as disclosed in chinese patent application No. 201721071197.3, the current transformer includes a primary lead and a secondary coil sleeved on the primary lead, the secondary coil includes an annular core and an enameled wire wound on the annular core, and two ends of the enameled wire are connected to input ends of outgoing wires.

The sampling line of the current transformer in the prior art adopts a flexible wire welding mode, and needs manual positioning and welding, thereby causing low production efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the first technical problem that will solve is not enough to above-mentioned prior art exists, provides a current transformer, can be convenient for automated production, improves production efficiency.

The utility model aims to solve the second technical problem that an electric energy meter that uses has above-mentioned current transformer is provided.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: the utility model provides a current transformer, is including the main part, the primary lead wire and the sampling line that are provided with secondary coil, the primary lead wire passes from the main part, secondary coil cover is established outside the part that the primary lead wire is located the main part, its characterized in that: the current transformer further comprises a plug connector component, the plug connector component comprises a first plug connector, one end of the sampling line is fixed to the first plug connector, the other end of the sampling line is fixed to the main body, and the fixed end of the sampling line and the fixed end of the main body extend into the main body and can be connected with the secondary coil.

Preferably, in order to facilitate the relative fixation of the sampling line and the main body, a limiting hole for limiting the sampling line is formed in the main body.

Further, in order to detect the error of the current transformer, the current transformer further comprises a self-checking wire for detecting the error of the current transformer, the self-checking wire penetrates through the main body, two ends of the self-checking wire respectively penetrate out of two opposite ends of the main body to be connected with an alternating current power supply, and the secondary coil is sleeved outside a part, located in the main body, of the self-checking wire.

Further, for the convenience of self-checking line and external connection, the plug connector component further comprises a second plug connector, and the two ends of the self-checking line are fixed on the second plug connector.

Furthermore, for avoiding the reverse insertion of the plug connector assembly, the positive poles of the first plug connector and the second plug connector are provided with stop bars.

In order to avoid disordered wiring, two ends of the main body, through which the self-checking line penetrates out, are respectively provided with a positioning mechanism for positioning the self-checking line, and the positioning mechanism is in the form of a wire groove.

Preferably, the device further comprises a binding post, and two ends of the primary lead are respectively welded with the corresponding binding posts.

Further, in order to protect the primary lead, a heat shrink tube is sleeved on the periphery of the primary lead.

Further, in order to improve the magnetic field resistance, an iron shell is arranged in the main body.

The utility model provides a technical scheme that above-mentioned second technical problem adopted does: an electric energy meter, characterized by: a current transformer as described above is applied.

Compared with the prior art, the utility model has the advantages of: the end part of the sampling line is fixed, so that automatic welding can be realized, the producibility is higher, and the method can be used for automatic production; by arranging the self-checking line, the error can be conveniently self-checked, and the precision is improved; the positive pole of the plug connector is provided with the stop strip, so that the reverse insertion of the plug connector can be avoided; the heat shrinkable tube is arranged outside the primary lead, so that the primary lead can be well protected; the iron shell is arranged in the main body, so that the magnetic field resistance of the current transformer can be improved; finally, the current transformer with improved performances in all aspects is obtained.

Drawings

Fig. 1 is a schematic diagram of a current transformer according to an embodiment of the present invention;

fig. 2 is a sectional view of a current transformer according to an embodiment of the present invention;

fig. 3 is an exploded schematic view of the current transformer according to the embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present invention, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the disclosed embodiments of the invention may be oriented in different directions and the directional terms are intended to be illustrative and should not be construed as limiting, such as "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 3, a current transformer includes a main body 1, a primary lead 2, a binding post 3, a sampling line 4, a self-checking line 5, and a plug assembly 6.

The primary lead 2 is made of red copper and is U-shaped, the primary lead penetrates through the main body 1, and the two ends of the primary lead 2 are respectively welded and fixed with a binding post 3 so as to be connected with a metering part of an electric energy meter. The main body 1 is hollow and has a secondary coil (not shown) disposed therein, the secondary coil being fitted around the portion of the primary lead 2 located inside the main body 1. In this embodiment, the main body 1 is cylindrical and may be formed by two half- shells 13 and 14 that are semi-cylindrical and are fastened together, and both ends of the primary lead 2 respectively protrude from both axial ends of the main body 1. The above structure is the same as the prior art, and is not described herein.

The plug-in unit 6 is disposed outside the peripheral wall of the main body 1 on the side away from the terminal 3. The plug connector assembly 6 comprises a first plug connector 61 and a second plug connector 62, and the two plug connectors are SCN plug connectors. One ends of the two sampling lines 4 are fixed in the first plug-in connectors 61 respectively, and the other ends are fixed with the main body 1. The peripheral wall of the main body 1 is provided with a limiting hole 11, and the limiting hole 11 penetrates through the wall thickness of the main body 1, so that the inside of the main body 1 is communicated with the outside of the main body 1. The end part of the sampling line 4 extends into the main body 1 from the limit hole 11 and can be connected with the secondary coil, and is clamped with the limit hole 11 and limited by the limit hole 11, so that the sampling line 4 is prevented from moving, the position of the sampling line 4 can be fixed, and the sampling line can be conveniently welded with the secondary coil in the main body 1. Meanwhile, the sampling line 4 is fixed, so that automatic welding can be realized, and the production efficiency is improved.

The self-checking line 5 is an error self-checking line, which passes through the main body 1, two ends of the error self-checking line respectively pass through two axial ends of the main body 1, and the secondary coil is sleeved outside the part of the self-checking line 5 in the main body 1. The two ends of the self-checking wire 5 are fixed on the second plug-in connector 62, the two ends of the self-checking wire 5 can be connected to an alternating current power supply, a set current value can be introduced, and if the signal value of the secondary coil exceeds an allowable range, the accuracy error of the current transformer can be judged to be overlarge.

The axial two ends of the main body 1 are respectively provided with a positioning mechanism 7 so as to position the part of the self-checking wire 5 which penetrates out of the two ends of the main body 1, and the self-checking wire is connected to the second plug connector 62 according to a set direction. Each positioning mechanism 7 comprises a first wire groove 71 and a second wire groove 72, the opening directions of the first wire groove 71 and the second wire groove 72 are opposite, as shown in fig. 2, the opening of the first wire groove 71 faces upwards, and the opening of the second wire groove 72 faces downwards, so that the upper and lower positions of the self-check wire 5 are both defined.

The working temperature of the sampling line 4 and the self-checking line 5 is required to be-40-150 ℃, so that the heat resistance is improved.

The positive poles of the first connector 61 and the second connector 62 are provided with a stop bar 63, so that the reverse insertion of the connector assembly 6 with the outside can be avoided.

The primary lead 2 is provided at its outer circumference with a white heat shrinkable tube 21 so as to protect the primary lead 2. The width of the primary lead 2 is wider than that of the prior art, so that the heat dissipation area can be increased.

An iron case 12 is provided in the main body 1, whereby the current transformer can be made resistant to a magnetic field of 300 mT.

Claims (10)

1. A current transformer comprising a main body (1) provided with a secondary coil, a primary lead (2) and a sampling line (4), the primary lead (2) passing through the main body (1), the secondary coil being sheathed outside the portion of the primary lead (2) located inside the main body (1), characterized in that: the current transformer still includes plug connector subassembly (6), plug connector subassembly (6) include first plug connector (61), the one end of sampling line (4) is fixed with first plug connector (61), the other end then is fixed with main part (1), and sampling line (4) and the fixed one end of main part (1) extend into in main part (1) and can be connected with secondary coil.

2. The current transformer of claim 1, wherein: the main body (1) is provided with a limiting hole (11) for limiting the sampling line (4).

3. The current transformer of claim 1, wherein: the current transformer fault detection circuit is characterized by further comprising a self-detection line (5) used for detecting errors of the current transformer, wherein the self-detection line (5) penetrates through the main body (1), two ends of the self-detection line (5) penetrate out of two opposite ends of the main body (1) respectively to be connected with an alternating current power supply, and the secondary coil is sleeved outside a part, located in the main body (1), of the self-detection line (5).

4. The current transformer of claim 3, wherein: the plug connector assembly (6) further comprises a second plug connector (62), and two ends of the self-checking line (5) are fixed on the second plug connector (62).

5. The current transformer of claim 4, wherein: and the positive poles of the first plug connector (61) and the second plug connector (62) are respectively provided with a stop strip (63).

6. The current transformer of claim 3, wherein: the two ends of the main body (1) for the self-checking line (5) to penetrate out are respectively provided with a positioning mechanism (7) for positioning the self-checking line (5), and the positioning mechanisms (7) are in the form of wire grooves.

7. The current transformer according to any one of claims 1 to 6, wherein: the secondary lead wire is characterized by further comprising binding posts (3), and two ends of the primary lead wire (2) are respectively welded with the corresponding binding posts (3).

8. The current transformer according to any one of claims 1 to 6, wherein: the periphery of the primary lead (2) is sleeved with a heat shrink tube (21).

9. The current transformer according to any one of claims 1 to 6, wherein: an iron shell (12) is arranged in the main body (1).

10. An electric energy meter, characterized by: a current transformer according to any one of claims 1 to 9 is used.

Images