CN213752285U

CN213752285U - Lengthened iron core of current transformer

Info

Publication number: CN213752285U
Application number: CN202023119440.9U
Authority: CN
Inventors: 张树华; 曾超庆; 覃庚明; 陈东生; 林永洪; 谢剑雄; 钟志恒; 曾定; 莫敬辉
Original assignee: GUANGDONG SIHUI INSTRUMENT TRANSFORMER WORKS CO Ltd
Current assignee: GUANGDONG SIHUI INSTRUMENT TRANSFORMER WORKS CO Ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-07-20
Anticipated expiration: 2030-12-21

Abstract

The utility model discloses a current transformer's extension is unshakable in one's determination, including semicircle ring core and cuboid iron core, the semicircle ring is unshakable in one's determination including first semicircle ring core and second semicircle ring core, the cuboid is unshakable in one's determination including first cuboid iron core and second cuboid iron core, first semicircle ring core both ends are connected with first cuboid iron core and second cuboid iron core one end respectively, second semicircle ring iron core both ends are connected with first cuboid iron core and the second cuboid iron core other end respectively, first semicircle ring iron core, second semicircle ring iron core, first cuboid iron core and second cuboid iron core connect and form a closed magnetic circuit. The utility model discloses can reduce current transformer coil quantity, reduce the current transformer production degree of difficulty and reduce manufacturing cost.

Description

Lengthened iron core of current transformer

Technical Field

The utility model relates to a current transformer is unshakable in one's determination, concretely relates to current transformer's extension unshakable in one's determination.

Background

In the current ac heavy current measurement technology, a current transformer for measuring current is generally a feedthrough current transformer, and its iron core is circular, as shown in fig. 3, a conductor passes through a circular iron core rolled from a silicon steel sheet; the current transformer coil is directly and uniformly wound on the circular iron core and is connected with the secondary load of the current coil of the current transformer such as an instrument relay transmitter in series to form a closed loop. For a large conductor, the larger the cross-sectional area of the large conductor is, the larger the diameter of the circular iron core is, and the longer the surrounding length of the current transformer coil wound on the circular iron core is, so that the using amount of the current transformer coil is large, and the production difficulty and the production cost of the current transformer are increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a current transformer's extension is unshakable in one's determination, makes the current transformer coil needn't encircle circular unshakable in one week, reduces the current transformer coil quantity.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a lengthened iron core of a current transformer comprises a semicircular iron core and a cuboid iron core, wherein the semicircular iron core comprises a first semicircular iron core and a second semicircular iron core, the cuboid iron core comprises a first cuboid iron core and a second cuboid iron core, two ends of the first semicircular iron core are respectively connected with one end of the first cuboid iron core and one end of the second cuboid iron core, and two ends of the second semicircular iron core are respectively connected with the other end of the first cuboid iron core and the other end of the second cuboid iron core;

the first semicircular iron core, the second semicircular iron core, the first cuboid iron core and the second cuboid iron core are connected to form a closed magnetic circuit;

and the current transformer coil surrounds the cuboid iron core.

Furthermore, the adhesive at the joint of the semicircular iron core and the rectangular iron core is iron core adhesive.

Further, the current transformer coil is positioned on the cuboid iron core.

Furthermore, a large conductor penetrates through the first semicircular iron core and the second semicircular iron core, and the center line of the large conductor and the center lines of the first cuboid iron core and the second cuboid iron core are on the same horizontal plane.

Further, the semicircular iron core and the rectangular iron core are made of silicon steel sheets.

Furthermore, an ammeter is connected in series with the current transformer coil.

The beneficial effects of the utility model reside in that:

1. two semicircle ring cores and two cuboid iron cores are connected and are formed a closed magnetic circuit, and in closed magnetic circuit, two cuboid iron cores play the transition effect, have changed the magnetic circuit unshakable in one's determination of ring shape, extend the magnetic field magnetic circuit that produces around the large-scale conductor, and the current transformer coil only need twine on single cuboid iron core, need not distribute on circular iron core circumference, and then has reduced the current transformer coil quantity.

2. The utility model provides an effect on current transformer is unanimous with the ring shape iron core that has among the prior art that adds long iron core, and in current transformer production technology process, current transformer coil coiling process is key quality control point, and the required current transformer coil volume of current transformer is less, and is easier the production quality of accuse current transformer, and then reduces the production degree of difficulty, reduction manufacturing cost. Therefore, in practical application and production, contain the utility model provides a current transformer with lengthened iron core is more suitable for being used for measuring the electric current of large-scale conductor.

Drawings

FIG. 1 is a schematic diagram of an elongated iron core structure of a current transformer according to the present invention;

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

fig. 3 is a schematic structural diagram of a straight-through current transformer.

Reference numerals:

1. a first semicircular iron core; 2. a second semicircular iron core; 3. a first rectangular parallelepiped core; 4. a second rectangular parallelepiped core; 5. a current transformer coil; 6. a large conductor.

Detailed Description

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, so to speak, as communicating between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art. The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.

The invention will be further described with reference to the accompanying drawings and specific embodiments:

referring to fig. 3, current transformer among the prior art often adopts circular iron core, and the current transformer coil needs directly evenly to twine on circular iron core, and to large-scale conductor, large-scale conductor cross sectional area is big more, and circular iron core diameter is big more, and the current transformer coil of winding on circular iron core encircles length longer more, leads to the current transformer coil quantity big, increases the current transformer production degree of difficulty and manufacturing cost, and compares with this kind of prior art, the beneficial effects of the utility model are that:

The utility model discloses a current transformer's extension is unshakable in one's determination, as shown in figure 1, unshakable in one's determination and cuboid are unshakable in one's determination including the semicircle ring, the semicircle ring is unshakable in one's determination 1 and second semicircle ring 2 including first semicircle ring iron core, the cuboid is unshakable in one's determination 3 and second cuboid iron core 4 including first cuboid iron core 3, first semicircle ring iron core 1 both ends are connected with first cuboid iron core 3 and second cuboid iron core 4 one end respectively, second semicircle ring iron core 2 both ends are connected with first cuboid iron core 3 and second cuboid iron core 4 other ends respectively, first semicircle ring iron core 1, second semicircle ring iron core 2, first cuboid iron core 3 and second cuboid iron core 4 connect and form a closed magnetic circuit.

As a preferred scheme of the utility model, the adhesive of the junction between the semicircular ring iron core and the cuboid iron core is an iron core adhesive.

As a preferred scheme of the utility model, semicircle ring iron core and cuboid iron core are made by the silicon steel sheet.

Fig. 2 shows a schematic view of a preferred embodiment of the present invention installed in a current transformer.

As shown in fig. 2, the current transformer coil 5 is wound only on the first rectangular iron core 3, and the first semicircular iron core 1, the second semicircular iron core 2, and the second rectangular iron core 4 do not need to be wound with the current transformer coil 5. When the current transformer is used for measuring the current of the large conductor, the electrified large conductor penetrates through the first semicircular iron core 1 and the second semicircular iron core 2, and the central line of the large conductor 6 is on the same horizontal plane with the central lines of the first cuboid iron core 3 and the second cuboid iron core 4.

The working principle of measuring the current of the large conductor by using the current transformer is as follows:

the large conductor 6 penetrates through a lengthened iron core formed by connecting two semicircular annular iron cores and two cuboid iron cores to play a role of primary winding, the current transformer coil is wound on the first cuboid iron core 3 to play a role of secondary winding, and the current transformer coil 5 is connected with the ammeter in series to form a closed loop.

The current transformer is essentially used for realizing isolated current transformation, the transformation ratio of the current of the large conductor 6 to the current output by the current transformer coil 5 is generally controlled to be hundreds to thousands of times, and the current output by the current transformer coil 5 is far smaller than the current of the original large conductor 6, so that the current transformer is convenient to adapt to the working requirement of an electronic circuit.

The turn ratio of the current transformer is set as N, for the convenience of expression, N is defined as the turn ratio of the secondary winding of the current transformer coil 5 to the turn ratio of the primary winding of the large conductor 6 combined with the lengthened iron core, i.e. the reciprocal of the turn ratio in the industry, and the current flowing through the large conductor 6 is set as I₁The current output from the current transformer coil 5 is I₂. There must be the relation:

the current transformer coil 5 is provided with an ammeter which measures the current output from the current transformer coil 5 as I₂Combining the above relational expressionAccording to the formula I shown on an ammeter₂And the coil turns ratio of the known current transformer can be used for obtaining the large conductor current I₁Size.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims

1. The utility model provides a current transformer's extension is unshakable in one's determination, includes that semicircle ring core and cuboid are unshakable in one's determination, its characterized in that: the semicircular iron core comprises a first semicircular iron core (1) and a second semicircular iron core (2), the cuboid iron core comprises a first cuboid iron core (3) and a second cuboid iron core (4), two ends of the first semicircular iron core (1) are respectively connected with one ends of the first cuboid iron core (3) and the second cuboid iron core (4), and two ends of the second semicircular iron core (2) are respectively connected with the other ends of the first cuboid iron core (3) and the second cuboid iron core (4);

the first semicircular iron core (1), the second semicircular iron core (2), the first cuboid iron core (3) and the second cuboid iron core (4) are connected to form a closed magnetic circuit;

and the current transformer coil (5) is surrounded on the single cuboid iron core.

2. The elongated core for a current transformer according to claim 1, wherein: and the adhesive at the joint of the semicircular iron core and the cuboid iron core is an iron core adhesive.

3. The elongated core for a current transformer according to claim 1, wherein: and the current transformer coil (5) is positioned on the first cuboid iron core (3).

4. The elongated core for a current transformer according to claim 1, wherein: the large conductor (6) penetrates through the first semicircular iron core (1) and the second semicircular iron core (2), and the central line of the large conductor (6) and the central lines of the first cuboid iron core (3) and the second cuboid iron core (4) are on the same horizontal plane.

5. The elongated core for a current transformer according to claim 1, wherein: the semicircular iron core and the cuboid iron core are made of silicon steel sheets.

6. The elongated core for a current transformer according to claim 1, wherein: the current transformer coil (5) is connected in series with an ammeter.