JPH0220815Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a bushing-type current transformer, for example, a bushing-type current transformer used in a high-voltage closed switchboard.

FIG. 1 is a partial side sectional view showing a high voltage closed switchboard using a conventional current transformer. In FIG. 1, a closed switchboard 1 houses three-phase first to third stage drawers and disconnectors 2 to 4. The first to third stage primary side connectors 5 to 7 are provided to the first to third stage drawers and disconnectors 2 to 4, and are provided to the first to third stage drawers and disconnectors 2 to 4. The three phases of the primary internal conductor are arranged and connected in the vertical direction of the paper. 1st
~The third stage secondary side connectors 8 to 9 are provided in the first to third stage drawers and disconnectors 2 to 4, and the first to third stage
The drawer shapes of the stages and the secondary internal conductors of the disconnectors 2 to 4 are arranged and connected for each of the three phases in a direction perpendicular to the plane of the paper. Three-phase main circuit busbars 11a to 11c are housed in the closed switchboard 1 in a direction perpendicular to the plane of the drawing. Power supply conductors 12a to 12c are main circuit busbars 11a to 11
c and each phase of the first to third stage primary side connectors 5 to 7 are connected for each phase. The first to third stage bushings 13 to 15 each have a power supply conductor 12
It has a through hole through which the holes a to 12c are inserted, and the first to
One end is connected to each phase of the third-stage secondary side connectors 8 to 9, and power supply conductors 12a to 12 are connected to each phase.
It is constructed by being formed integrally with the first to third stage primary side conductors 16 to 18 arranged in the direction perpendicular to c and an insulating material, and is installed in the closed switchboard 1. In the current transformers 19 to 21 of the first to third stages, the primary terminals of each phase are connected to the primary conductors 16 to 18 of the first to third stages.
It is connected to the other end of each phase and installed inside the closed switchboard 1. The first to third stage lead-out cables 22 to 24 are connected to the first to third stage current transformers 1 for each phase.
It is connected to the secondary side terminal of each phase 9 to 21, and supplies power to a load (not shown), respectively.

In the closed switchboard 1 using the conventional first to third stage current transformers 19 to 21, the first to third stage current transformers 19
21 and the first to third stage bushings 13 to 15 must be installed separately in the closed switchboard 1, and the closed switchboard 1 becomes large and
-The number of parts required to install the third-stage current transformers 19 to 21 has increased, resulting in a disadvantage that assembly and adjustment takes time.

This invention was made to improve the drawbacks of the conventional ones as described above, and the current transformers 1 of the first to third stages are installed in the bushings 13 to 15 of the first to third stages.
It is an object of the present invention to provide a bushing type current transformer in which the closed switchboard 1 is reduced in size and the time for assembly and adjustment is reduced by incorporating the switches 9 to 21. An embodiment of this invention will be described below with reference to the drawings.

FIG. 2 is a partial side sectional view showing an embodiment of a high-voltage closed switchboard using a bushing-type current transformer according to this invention, and FIG. 3 is an illustration of the bushing-type current transformer according to this invention shown in FIG. FIG. 4 is an enlarged plan view showing the embodiment; FIG. 4 is a front view taken from the bottom of FIG. 3; FIG. 5 is a cross-sectional plan view taken along the line - in FIG. FIG. In each figure, the same parts as in FIG. 1 are designated by the same reference numerals.
In FIGS. 2 to 6, the bushings 13A to 15A of the first to third stages are constructed as shown in FIGS. 3 to 6, respectively, and the power supply conductor 1
2a to 12c, one end 161 is connected to each phase of the secondary side connectors 8 to 9 of the first to third stages, and the lead-out cables 22 of the first to third stages are connected to each other. The other end 162 is connected to each of the 24 phases, and the power supply conductor 12a to 12c is connected to each phase.
The first to third stage primary conductors 16, 16a to 16c, 17, 18 are arranged in a direction perpendicular to ~Third stage current transformer 19A~21
A power supply conductor 12 is installed to surround the iron core and secondary windings 19a to 19c and the through hole 131.
It is constructed by integrally molding a shield material 25, which is, for example, a cylindrical ground metal, for shielding the secondary windings 19a to 19c from magnetic fluxes a to 12c, using an insulating material 132 such as epoxy resin.

This invention is structured as described above, and the first to third
Since the first to third stage current transformers 19A to 21A are built into the bushings 13A to 13C of can be reduced.

In the above embodiment, the closed switchboard 1 includes the first to
Although the case where the third stage of drawers and disconnectors 2 to 4 are installed has been described, it goes without saying that the number of stages may be any number.

As described above, this invention has various effects such as being able to downsize the device and reducing assembly and adjustment time.

[Brief explanation of the drawing]

Fig. 1 is a partial side sectional view showing a high voltage closed switchboard using a conventional current transformer, and Fig. 2 is a partial side sectional view showing an embodiment of a high voltage closed switchboard using a bushing type current transformer according to this invention. 3 is an enlarged plan view showing an embodiment of the bushing type current transformer according to the invention shown in FIG. 2, FIG. 4 is a front view seen from the bottom of FIG. 3, and FIG. FIG. 4 is a plan sectional view taken along line - in FIG. 4, and FIG. 6 is a side sectional view taken along line - in FIG. In the figure, 12a to 12c are power supply conductors, 13
A to 15A are first to third stage bushings, 131
is a through hole, 132 is an insulating material, 16, 16a to 16
17 and 18 are primary conductors, 19A to 21A are first to third stage current transformers, 19a to 19c are iron cores and secondary windings, and 25 is a shielding material. Note that the same parts in each figure are given the same reference numerals.

Claims (1)

[Claims for Utility Model Registration] 1. A primary conductor installed so that both ends are exposed, an iron core and a secondary winding of a current transformer placed around the primary conductor, and the primary conductor. A bushing type variant is formed by integrally molding an insulating material with a shield material that shields the secondary winding from the magnetic flux of a power conductor installed in a direction perpendicular to the power conductor, and forming a through hole through which the power conductor is inserted. Flushware. 2. The bushing type current transformer according to claim 1, wherein the shield material is installed so as to surround the through hole.