JPH10161548A - Method for mounting name plate of through type current transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recognize the characters of a name plate through the insulation layer in a surface after thermal curing and to prevent the drop-out of the name plate itself or the erasure of the characters. SOLUTION: This through type current transformer is constituted by winding electric wires 3 via the insulation layer 2 on an annular iron core 1 and winding tapes 4 impregnated with a thermosetting resin thereon while half overlapping these tapes to cover the entire surface, then curing the tapes 4 by heating, thereby forming the insulation layer on the surface. A resin material which turns transparent or translucent after curing is used for the thermosetting resin for impregnation in the tapes 4 to be wound on the electric wires 3. The name plate 5 is wound together with the tapes on the inner side of the tapes 4 at the time of winding the tapes 4 on the electric wires 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a bushing C for a gas insulated switchgear (GIS) or a gas insulated circuit breaker (GCB).
The present invention relates to a method of attaching a nameplate to a dry type current transformer installed in a T storage unit or the like.

[0002]

A conventional dry penetration type current transformer is provided with insulation on a surface of an annular core, winding an electric wire around the surface of the core, and further impregnating the surface with a thermosetting resin. After winding the tape while half-stacking it, it is heated and cured to form an insulating shielding layer on the surface. Furthermore, a nameplate describing the specifications of the current transformer, such as the current transformer ratio, load (load), serial number, and terminal symbol, is attached to the side surface of the current transformer. When the nameplate is installed in an environment where the nameplate is easily peeled, the specifications are printed on the main body using a rubber stamp and replaced with the nameplate. However, in these operations, since the resin has been cured, the surface of the current transformer has become smooth, and it has not been easy to attach a nameplate and perform printing using a rubber stamp. In particular, since the side surface of the current transformer is a curved surface, it is difficult to attach the nameplate and it is easy to peel off. Furthermore, if the completed current transformer rubs on the exterior surface during testing or transportation, the attached nameplate may peel off or the printing may disappear.

As is well known, strict dust control and moisture control are required inside the GIS in order to avoid a chemical reaction between the sealed gas and impurities and a decrease in dielectric strength due to moisture. In addition, the materials used in the GIS have many restrictions, such as the inability to use a material that generates a decomposed gas by reacting with the sealing gas, in addition to being hygroscopic. Therefore, the current transformer built into the GIS cannot be attached with an attached nameplate that may be peeled off from its outer surface. Use is limited to what is done. Further, the ink for printing the specifications of the current transformer is also limited to a specific ink that does not match the carbon component.

Further, the GIS includes current transformers of various specifications for relays such as current measurement, bus protection, transformer protection, etc.
Since several units are arranged in three phases per phase, the current transformers cannot be arranged in the GIS in the order in which the current transformers are arranged unless the printing is erased or the ink for the printing is not sufficiently dried. If the installation is performed with insufficient drying, the amount of water in the gas will increase after installation on the GIS. And it causes a lot of trouble. in this way,
The handling of the current transformer alone was extremely troublesome.
Therefore, there has been a demand for the development of a dry-type penetrating current transformer that can be easily installed on a GIS or the like without losing the description on the nameplate.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to wind an electric wire around an annular core through an insulating layer, and to half-stack a tape impregnated with a thermosetting resin. After covering the entire surface while winding, in a penetration type current transformer that forms an insulating layer on the surface by heating and curing the tape, as a thermosetting resin to impregnate the tape wound on the electric wire, after curing By using a transparent or translucent resin material and wrapping the nameplate inside the tape when wrapping the tape on the electric wire, the characters on the nameplate can be recognized through the insulating layer on the surface after heat curing.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of a current transformer assembled according to the present invention, and FIG. 2 is an enlarged sectional view of a main part of FIG. In the current transformer according to the present invention, first, the insulating layer 2 is formed on the outer periphery of the ring-shaped iron core 1 as in the related art, and then the electric wire 3 is wound. Next, the insulating tape 4 is wound around the outside of the electric wire 3 while being half-stacked. Here, the nameplate 5 is prepared by printing specifications such as current conversion ratio, load (load), serial number and terminal symbol on a heat-resistant film or the like in advance, and the insulating tape 4 is wound. At this time, the insulating tape 4 is partially formed into a double configuration, and the exterior is formed while the nameplate 5 is sandwiched between the portions.

[0007] As shown in FIG.
A substantially transparent and slightly creamy thermosetting resin 7 such as an epoxy resin is applied to a base 6 made of white tetron tape.
Even if the resin 7 cures, the semi-transparent state is maintained when the resin 7 is overlapped, so that the nameplate 5
Can be read sufficiently. At this stage, nameplate 5
There is still a gap around the area and it is not completely isolated from the outside. Next, the current transformer is placed in a drying furnace and heated. While the insulation tape 4 has not yet cured at the beginning of heating,
The moisture in the ink written on the nameplate 5 evaporates from the minute gaps in the insulating tape 4 and is dried.

When the temperature rises, the viscosity of the resin 7 in the insulating tape 4 decreases from the semi-cured state to a liquefied state,
After the gap is filled with the substrate 6 as a medium and the entire current transformer exterior is coated, curing is started. When this state is maintained for a certain period of time and the curing of the insulating tape 4 is completed,
Upon cooling, the current transformer is completed. When the curing of the insulating tape 4 is completed, the nameplate 5 is completely shut off from the outside.
In these heating / drying steps, since the liquefaction and curing of the resin 7 are started after the ink described on the nameplate 5 is dried, the written characters and symbols are blurred and become unreadable. Is done. In addition, when the insulating tape 4 is cured, the surface of the nameplate 5 is protected by the base material 6 of the insulating tape 4 and further coated with the resin 7, so that the sealing is performed in a completely dry state. Therefore, restrictions on the material of the nameplate 5 itself and the ink components to be used are reduced.

When the current transformer assembled in this manner is incorporated into, for example, a GIS, each of the current transformers in a single state is connected to a current ratio, a load (load), and a serial number from a nameplate on the side of the current transformer. It can be performed while checking the specifications such as the terminal symbol and the like. From these facts, in the embodiment of the present invention, in the single state of the current transformer, the type stamping on the table is carried out on each nameplate with respect to the specifications such as the current transformation ratio, the load (load), the serial number, and the terminal symbol. It becomes possible. That is, since the nameplate can be created by describing the specifications together with the work of winding the insulating tape in a semi-stacked shape, the operation of creating and attaching the nameplate is simplified, and the management of the nameplate is also facilitated. In addition, since the current transformer exterior is covered with a resin so as not to be indistinguishable due to the diffusion of water in the printing ink or the like, the contents described on the nameplate are securely held in the current transformer main body. As a result, in the case of assembling a large number of current transformers into a GIS or the like, the work efficiency can be improved because the nameplate can be checked accurately and quickly.

[0010]

As described above, according to the first aspect of the present invention, a resin material which becomes transparent or translucent after curing a thermosetting resin impregnated in a tape wound on an electric wire of an annular core is used. When wrapping the tape over the wires, wrap the nameplate inside the tape. This makes it possible to recognize the characters on the nameplate through the insulating layer on the surface after heating and curing, thereby preventing the nameplate itself from being lost and the characters from disappearing.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a current transformer assembled according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a sectional view showing the structure of the insulating tape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron core 2 Insulation layer 3 Electric wire 4 Insulation tape 5 Name plate 6 Base material 7 Resin

Claims (1)

[Claims] 1. An electric wire is wound around an annular core via an insulating layer, and a tape impregnated with a thermosetting resin is wound on the annular core while covering the entire surface, and then the tape is cured by heating. In a through-type current transformer that forms an insulating layer on the surface, a resin material that becomes transparent or translucent after curing is used as the thermosetting resin to be impregnated in the tape wound on the wire, and a tape is placed on the wire. A nameplate mounting method for a penetration type current transformer, characterized in that the nameplate is wound around a tape together with the nameplate so that the characters on the nameplate can be recognized through the insulating layer on the surface after heat curing.