KR101680362B1

KR101680362B1 - Shunt reactor

Info

Publication number: KR101680362B1
Application number: KR1020160036084A
Authority: KR
Inventors: 정원창; 천기정
Original assignee: 주식회사 케이피 일렉트릭
Priority date: 2016-03-25
Filing date: 2016-03-25
Publication date: 2016-11-30

Abstract

The present invention relates to a shunt reactor, and is characterized in that, in a shunt reactor constituting a coil wound around an iron core, the coils are wound by being divided into coil groups which are electrically connected but have different current densities.
Accordingly, the molding member can maintain a uniform dielectric strength without eccentric thermal deformation due to the convection phenomenon, thereby significantly increasing the service life of the shunt reactor.

Description

SHUNT REACTOR

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shunt reactor, and more particularly, to a shunting reactor capable of preventing eccentric thermal deformation from occurring due to convection due to a molding member that insulates the coil while enclosing the coil.

Generally, a shunt reactor is a solid insulation type electric apparatus that surrounds a core between a core and a coil so as to suppress a forward current due to charging current between the ground in a long line.

Such shunting reactors are excellent in chemical resistance and water resistance heat resistance since they do not generate gas during curing and are less resistant to mechanical shrinkage due to less reaction shrinkage. Therefore, even when the shunting reactor is left for a long time, damage to the transformer is small and the winding is molded in a high vacuum. And is also resistant to abnormal vibration. Therefore, it is suitable for use in a part where stable voltage supply is required, for example, in a public building, a subway, a hospital, or the like.

Hereinafter, a shunt reactor according to the prior art will be described with reference to FIG.

As shown in the drawing, the shunt reactor according to the related art includes three iron cores 11a, 11b and 11c, an upper frame 12 and a lower frame 13 for supporting the iron cores 11a, 11b and 11c, 11a, 11b, and 11c, and a molding member 30 for molding the iron core and the coil so as to insulate the coil from each other.

For reference, in the case of a coil applied to a transformer, winding is performed in a state of being divided into a low-voltage coil 2a and a high-voltage coil 2b.

The molding member 30 can minimize the risk of occurrence of fire due to its flammability and self-extinguishing properties. It has no gas generation during curing, is less mechanically stable due to less reaction shrinkage, has excellent chemical resistance and water resistance heat resistance, There is also an advantage of less damage.

On the other hand, the coil 20 is the main cause of the temperature rise of the transformer. That is, when the current of the coil is energized, heat is generated by itself and the temperature of the outside is added to increase the temperature. These shunting reactors heat-exchange with the surrounding by natural convection and cool down.

However, as in the prior art, the coil 20 having the same size along the longitudinal direction of the iron cores 11a, 11b, and 11c is wound. As a result, the temperature difference between the upper and lower portions Occurs. That is, since the external cold air flows upward from the lower portion of the molding member 30 and rises to the upper portion, the upper portion of the molding member 30 always maintains a higher temperature than the lower portion thereof. The deterioration of the upper part progresses rapidly, resulting in a decrease in insulation performance and a shortening of the lifetime of the device itself.

Registered Patent Bulletin 10-1115433 (2012.02.06) High-voltage power condenser series dry mold reactor

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional art described above, and it is an object of the present invention to provide a method of manufacturing a molded product which can maintain a uniform dielectric strength without being eccentrically thermally deformed by a convection phenomenon, And to provide a shunt reactor in which the structure of the coil is improved.

In order to achieve the above object, a shunt reactor according to the present invention is a shunt reactor constituting a coil wound around an iron core, characterized in that the coils are wound by being divided into coil groups which are electrically connected but have different current densities .

Wherein the coil is constituted by an upper coil group having the same winding cross-sectional area based on the longitudinal center portion of the iron core and a lower coil group having a winding cross-sectional area narrower than the winding cross-sectional area of the upper coil group.

And the current density of the upper coil group is smaller than the current density of the lower coil group.

And the coil is constituted by an upper coil group, a lower coil group and an intermediate coil group having different sizes of cross-sectional area wound along the longitudinal direction of the iron core.

The current density of the upper coil group is smaller than the current density of the middle coil group and the current density of the middle coil group is smaller than the current density of the lower coil group.

And the coil is made of a conductor having different current densities depending on the winding position.

And the coil has a cross-sectional area gradually increased from the lower portion to the upper portion.

And the cross-sectional shape of the coil is any one of a circular shape, a square shape, and a foil shape.

According to the present invention having the above-described structure, since the winding cross-sectional areas of the coils to be wound of the iron core are different from each other, the molding member can maintain a uniform dielectric strength without eccentric thermal deformation by convection, The life span can be greatly increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a mold-type shunt reactor according to the prior art; FIG.
2 is a front view showing the configuration of a shunt reactor according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view showing the configuration of a coil and a molding member provided in the iron core of Fig. 2;
Fig. 4 is a schematic view showing the coil cross-sectional structure of Fig. 3. Fig.
5 is a schematic view showing a coil cross-sectional structure according to another embodiment of FIG.
FIG. 6 is a schematic view showing a coil cross-sectional structure according to another embodiment of FIG. 3; FIG.
FIG. 7 is a cross-sectional view showing the shape of the coil of FIG. 2. FIG.
Fig. 8 is a partial cross-sectional view and an enlarged view showing the configuration of the molding member of Fig. 2;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying FIGS. 2 to 8. FIG.

The shunt reactor A and the transformer B according to the present invention include an upper frame 110 and a lower frame 120 and an iron core 120 installed between the upper frame 110 and the lower frame 120, A coil 200 wound around the iron core 130 and a molding member 300 installed between the iron core 130 and the coil 200.

The constitution of the upper frame 110, the lower frame 120, the iron core 130, the coil 200 and the molding member 300 is an essential component of the shunt reactor A and the transformer B, And therefore its specific configuration and operation are omitted.

The coil 200 to be applied to the shunt reactor A is made of one single structure and the coil 200 applied to the transformer B is installed by dividing into a primary coil and a secondary coil .

Hereinafter, the structure of the coil 200, which is a characteristic component of the present invention, will be described in detail.

The coil 200 according to the present invention has a winding cross sectional area h1 that is wound near the upper frame 110 such that the current density is different according to the winding position of the iron core 130, Sectional area (h2) of the winding wire wound on a side close to the winding surface (h2).

That is, the coil 200 is divided into at least two coil groups having different current densities at the time of energization which is electrically connected, and is wound.

This is because the current density of the upper and lower portions of the coil 200 wound around the iron core 130 in the longitudinal direction is different from the current density of the upper and lower portions of the coil 200, And the like.

That is, since the external cold air flows upward from the lower portion of the molding member 300 and then rises to the upper portion, the upper portion of the molding member 300 always maintains a higher temperature than the lower portion thereof, The current density of the upper part can be lowered and the amount of heat generated can be minimized.

Therefore, by allowing intensive cooling action to be performed on the lower side where cool air initially enters, the temperature deviation of the upper and lower portions of the molding member 300 can be reduced.

In other words, if the winding cross-sectional area of the coil 200 is narrow, current density increases and the amount of heat generated is high, the hot air can be easily canceled by the cold air initially collected, The current density can be lowered and the amount of heat generated can be reduced. As a result, it is possible to prevent the heat from concentrating on the upper portion of the molding member 300 in advance.

4, the coil 200 has a winding cross-sectional area h1 of the upper coil group 200a and a winding cross-sectional area of the upper coil group 200a, which have the same winding cross- h2 and a lower coil group 200b having the same winding cross-sectional area h2.

That is, the winding cross-sectional area h1 of the upper coil group 200a is larger than the winding cross-sectional area h2 of the lower coil group 200b, and the current density of the upper coil group 200a is larger than that of the lower coil group 200b.

5, the coil 200 includes an upper coil group 200a, a lower coil group 200b, and an intermediate coil group 200c having different cross-sectional areas wound along the longitudinal direction of the iron core 130 ).

Similarly, the winding cross-sectional area h3 of the intermediate coil group 200c is wider than the winding cross-sectional area h2 of the lower coil group 200b, and the winding cross-section area h3 of the upper coil group 200a is larger than the middle coil group 200c, The current density of the upper coil group 200a is smaller than the current density of the intermediate coil group 200c and the current density of the lower coil group 200b ) Is relatively small.

The coil 200 may be formed of a conductor having a different current density depending on the winding position.

That is, the upper coil group 200a, the lower coil group 200b, and the middle coil group 200c are selectively made of copper, aluminum, silver, or zinc.

6, the coil 200 may have a structure in which the cross-sectional area h4 of the winding gradually increases from the lower part to the upper part with respect to the longitudinal direction of the iron core 130. [

The cross-sectional shape of the coil 200 according to the present invention may be circular, square, or foil (see FIG. 7).

8, the molding member 300 is insulated with a structure of covering the coil 200 in a state of being embedded therein. The glass 200 is wound around a glass net 200 surrounding the inner and outer circumferential surfaces of the coil 200, And an epoxy molding unit 320 formed by impregnating the coil 200 and the glass net 310 in an epoxy resin bath.

The glass net 310 reinforces crack resistance and short-circuit mechanical force of the coil 200.

The glass net 310 is an article produced by Korea Fiber Co., and the cross-sectional thickness of the article is preferably limited to 1.2 mm to 1.7 mm.

If the cross-sectional thickness of the glass net 310 is less than 1.2 mm, it is difficult to secure crack resistance and short-circuit mechanical strength. If the cross-sectional thickness exceeds 1.7 mm, the glass net 310 has a high strength and naturally warps in the circumferential direction surrounding the coil 200 The problem is that the polygon structure is not bent.

Further, quartz powder for enhancing fire-extinguishing property and flame retardancy is added to the epoxy molding part 320 and mixed with an epoxy resin.

The quartz powder has an effect of effectively improving fire safety by minimizing the thermal mechanical force and ensuring self-extinguishing property and flame retardancy by making the coefficient of linear expansion of the epoxy resin similar to that of the aluminum conductor.

According to the present invention configured as described above, since the winding cross-sectional areas of the coils to be wound in the iron core are different from each other, the molding member can maintain a uniform dielectric strength without eccentric thermal deformation due to the convection phenomenon, There is an effect that can be increased.

110: upper frame 120: lower frame
130: iron core 200: coil
200a: upper coil group 200b: lower coil group
200c: intermediate coil group 300: molding member
A: Shunt reactor B: Transformer

Claims

A shunt reactor comprising a coil wound around an iron core,
The coil is divided into a coil group which is electrically connected and has different current densities and is wound,
Wherein the coil includes an upper coil group, a lower coil group, and an intermediate coil group having different sizes of cross-sectional areas wound along the longitudinal direction of the iron core,
Wherein the current density of the upper coil group is smaller than the current density of the middle coil group and the current density of the middle coil group is smaller than the current density of the lower coil group.

delete

The method according to claim 1,
Wherein the coils are made of conductors having different current densities depending on positions where the coils are wound.

The method according to claim 1,
Wherein a cross-sectional area of the coil gradually increases from the lower portion to the upper portion of the coil.

The method according to claim 6,
Wherein the cross-sectional shape of the coil is one of a circular shape, a square shape, and a foil shape.