JPS6242511Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to lead wires for stationary inductors such as transformers and reactors, and its purpose is to shorten work time by providing lead wires with improved insulation methods. and to improve dielectric strength.

After installation of the equipment, the leads must be insulated at the lead connections and at the lead bends. A conventional insulation method in this case is shown in FIG. In the figure, the lead wire 1 is provided with lead insulation 2, but the lead connection portion or the lead bent portion 3 will be provided with insulating taping 4 after the equipment is installed. However, the insulation at the connecting portion or the bent portion 3 has a disadvantage in that it is susceptible to creep breakdown from the contact point 5 between the lead insulation 2 and the taping 4. Therefore, the taping 4 is the overlapping part 6.
As shown in the figure above, it was applied repeatedly, but it was not perfect.

This idea was made in consideration of the above points,
To provide a lead wire for a stationary inductor in which insulating tubes are inserted in advance into the lead insulation and the insulating tubes are pulled out when taping is performed to eliminate the taping joint.

FIG. 2 shows a lead wire according to this invention, in which two insulating tubes 7a and 8a and 7b and 8b are shown inserted into the lead insulation 2 on both sides of the connecting or bent portion 3, respectively. However, the other configurations are the same as in FIG.

After installing the equipment, first, insulating tape 4 is applied to the inner insulating tubes 7a and 7b, and then the insulating tubes 7a and 7b are pulled out as shown by the arrows in FIG. 2a, and their tips are overlapped. Further, insulating taping 4 is applied thereto up to the positions of the outer insulating tubes 8a and 8b, and then the insulating tubes 8a and 8b are pulled out, and their tips are overlapped. Insulating taping 4 is further applied thereon to form an overlapping portion 6 to complete the insulation of portion 3. As shown in FIG. 3, the overlapping portion 6 may not be provided.

As described above, according to this invention, the insulating cylinders inserted in advance on both sides of the connecting part or the bent part of the lead wire are pulled out and their tips are overlapped when insulating, thereby eliminating the taping joint and performing continuous taping. This has the effect of making creep breakdown less likely to occur and improving dielectric strength. Furthermore, since there is no need to provide overlapping parts, there is also the advantage that the working time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a lead wire of a conventional static inductor, and FIGS. 2, 2a, and 3 are sectional views showing lead wires of a static inductor according to this invention. In the figure, 1 is the lead wire, 2 is the lead insulation,
Reference numeral 3 indicates a connecting portion or a bent portion of a lead wire, 4 an insulating taping, 6 an overlapping portion, and 7a, 7b, 8a and 8b an insulating tube.

Claims (1)

[Scope of utility model claims] In a static inductor lead wire that has a connection part or a bent part without insulation, and the remaining part is insulated, it is pulled out from the lead insulation when insulating the connection part or the bent part, and the remaining part is insulated. A lead wire for a stationary inductor, characterized in that an insulating tube forming an insulating wall is housed within the lead insulation.