JPH0471211A - Penetrating type current transformer - Google Patents

Abstract

PURPOSE:To obtain a small-sized penetrating type current transformer of simple structure excellent in heat dissipation effect, by covering facing end-portions divided into two part with a T-branched type cover, and connecting the residual one side of the T-branched type cover with a blower and the like. CONSTITUTION:Insulator 2 and a low voltage winding 3 are divided into two portions in the peripheral direction of an iron core, and wound around an iron core 2 formed in a ring type, so as to be mutually overlapped. A gap segment 6 is inserted into the insulators 2 between the low voltage windings, thereby forming a cooling path 7. The facing end-portions of the low voltage winding 2 divided into two parts are covered with a T-branched cover 8, and the residual one side is connected with a blower and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a through-type current transformer in which a cooling passage is formed within a winding or between a winding and an iron core.

(Prior Art) A conventional through-type current transformer with a cooling passage formed therein is constructed as shown in FIGS. 3 and 4. A cooling duct 4 is disposed in a coiled manner within the immediate action 2, and a blower or the like is connected to one end of the duct 4 to cool the low voltage winding 3.

(Problem B to be solved by the invention) However, in the through-type current transformer having the above structure, the piping 5 must be connected to each cooling duct 4,
The structure is complicated and assembly work is troublesome. Furthermore, when the number of cooling ducts 4 increases, the space required for pipe connection increases, the winding space for the low voltage winding 3 decreases, and the entire through-type current transformer becomes larger. Furthermore, in this case, there is a drawback that the leakage flux of the iron core 1 increases and the characteristics of the feedthrough current transformer deteriorate.

The object of the present invention is to eliminate the above-mentioned drawbacks, and to obtain a small, high-performance through-hole current transformer that has a simple structure, is easy to assemble, and has an excellent heat dissipation effect.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention covers the opposing ends of a low voltage winding divided into two parts with a T-branch type cover, and covers the remaining one of the T-branch covers. It is designed to be connected to a blower.

(Function) As a result, the means for blowing air to the cooling passage formed in the winding is simplified, and a small through-type current transformer with excellent heat dissipation effect can be obtained.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2. In the drawings, parts that are the same as the conventional ones in FIGS. 3 and 4 are designated by the same reference numerals.

The through-type current transformer of the present invention has an iron core 1 formed in a ring shape.
An insulator 2 and a low-voltage winding 3 are divided into two parts in the circumferential direction of the core, and are wound in an alternately overlapping manner. Further, a spacer piece 6 is inserted into the insulator 2 between the low voltage windings, and a cooling passage 7 having a square or triangular air gap cross section is formed between the spacer pieces 6. Low voltage winding 2 further divided into two parts
The opposite ends of the cover 8 are covered with a T-branched cover 8, and the remaining end is connected to a blower or the like.

In the through-type current transformer configured in this way, there is no need to connect piping etc. to each cooling passage 7 individually, and even if the number of cooling passages 7 increases, no space is required for sending cooling gas. It becomes low and overwhelming &! 30 winding space is increased, not only making the entire feed-through current transformer smaller, but also making it possible to effectively wind the low-voltage winding 3 in the magnetic path of the iron core 1, which reduces leakage flux and improves characteristics. do.

In addition, compared to conventional cooling ducts, wasted space such as gaps created due to the thickness of the duct constituent members and the insertion of the cooling duct can be effectively used as the cooling passage 7, and furthermore, the temperature increases due to the thermal resistance of the duct constituent members. Since there is no rise in temperature, cooling performance can be significantly improved.

Incidentally, even if the cooling passage is constituted by a cooling duct as in the conventional case, there is an effect that no piping connection and space for it are required, or the gap created by inserting the cooling duct can be used as the cooling passage.

〔Effect of the invention〕

As described above, according to the present invention, a cooling passage is provided between an iron core, a low voltage winding and an insulator wound along the magnetic path of the iron core, and between the low voltage windings or between the low voltage winding and the iron core. In a through-type current transformer consisting of spacer pieces for forming two
Cover the divided opposing ends with a T-branched cover,
Since I connected the remaining side of the T-branch type cover to a blower, etc.
It is possible to obtain a through-type current transformer with a simple structure, easy assembly work, excellent heat dissipation effect, small size, and good performance.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3. 1... Iron core, 2... Insulator, 3... Low voltage winding, 4
...Cooling duct, 5...Piping, 6...Spacer piece, 7
...Cooling passage, 8...T-branch type cover Applicant's representative Patent attorney Takehiko Suzue Figure Figure Figure Figure

Claims (1)

[Claims] It consists of an iron core, low voltage windings and insulators wound along the magnetic path of this iron core, and spacer pieces for forming cooling passages between the low voltage windings or between the low voltage windings and the iron core. The through-type current transformer is characterized in that the low-voltage winding is divided into two parts, opposing ends are covered with a T-branch type cover, and the remaining T-branch type cover is connected to a blower or the like. Current transformer.