JPS6148764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulation structure for an end of a high-voltage winding of an electric appliance such as a transformer and a lead-out portion of the high-voltage winding from the end.

Generally, in this type of electrical appliance winding, a plurality of insulating cylinders are arranged in the main gap between the concentrically arranged windings to divide the oil passage and prevent dielectric breakdown due to bridging of impurities in the oil. Since the dielectric strength of oil tends to increase as the width of the oil conduit becomes narrower, subdividing the oil conduit using insulating bulkheads is highly effective in improving dielectric strength. A sufficiently rounded electrostatic ring is placed at the end of the winding to alleviate the electric field concentration on the conductor at the end of the winding, and at the same time serves to improve the potential distribution within the winding. At the end of the insulating cylinder, an L-shaped ring with an L-shaped cross section is placed to cover the winding end side and end face in order to prevent creepage breakdown along the surface of the insulating cylinder, and the solid insulator is arranged in a direction perpendicular to the electric field. do.

Figures 1 and 2 show an example of a conventional insulation structure at the end of a winding of this kind.A low voltage winding 2 wound around a core leg 1 is connected to a high voltage winding 3 and its terminals on the outside. Tap windings 4, which are connected and grounded, are arranged concentrically. At the end of the high-voltage winding 3, an oil pipe 5 is provided in the center, and an electrostatic ring 6 with a sufficiently rounded shape is arranged at the inner and outer diameter ends, and is arranged between the low-voltage winding 2 and the high-voltage winding 3. A plurality of insulating cylinders 7 are arranged between the high voltage winding 3 and the tap winding 4. An insulating ring 8 having an L-shaped cross section is provided at the end of the insulating cylinder 7 to cover the side and end faces of the winding 3 from the inside and outside, and an oil pipe 9 is bored at a position corresponding to the oil pipe 5. . Further, a collar 10 is provided between the insulating rings 8 to cover the oil pipe 9 and increase the creepage insulation distance. The arrows indicate the flow of oil at the three ends of the high voltage winding.

Figure 3 shows the lead wire 3 of the high voltage winding 3 shown in Figure 2.
1, the same reference numerals indicate the same parts as in the previous example. The lead wire 31 is connected to the end of the winding 3 and insulated by an insulator 32, and can be led out from the end surface of the winding 3 in the axial direction. An insulating cylinder 33 is provided surrounding the lead wire 31 and being integral with each insulating ring 8 and arranged concentrically.

FIGS. 4 and 5 show an insulating ring 8 provided with an insulating tube 33. FIG. The same reference numerals indicate the same items as above.

As is clear from the above explanation, the conventional lead-out wire lead-out section includes two insulating rings having an L-shaped cross section facing each other via the oil pipe 9 in the center, and the rings and the insulating tube 33 at the base of the insulating tube. Since the insulating cylinder 33 and the L-shaped ring 8 are integrally arranged and concentrically arranged at two locations, precision in the mounting position of the insulating cylinder 33 is required, and a large number of man-hours are required for manufacturing. Furthermore, since the two insulating rings are integrated at only one place, they tend to dangle and are difficult to handle, and adjustments during assembly are time consuming and expensive.

The present invention has been made in view of these points, and it is an object of the present invention to provide an insulating structure for an end portion of an electrical appliance winding and a lead-out wire lead-out portion, which is easy to assemble and can be manufactured at low cost. This object has been achieved according to the invention by configuring an insulating ring that covers and insulates the side surfaces and above the end faces of the winding ends as follows.

In other words, the inner and outer diameter ends of the electric appliance winding ends and a part of the upper part of the winding end surfaces are arranged in the center with L-shaped cross-sectional inner and outer rings that face each other with an interval that serves as an oil passage, and a lead wire. A plurality of rings with insulating cylinders each consisting of a surrounding insulating cylinder and a collar integrally formed with the insulating cylinder and covering an upper side of the end surface of the winding are arranged at intervals at an overlapped end of the winding.

Figures 6 to 10 are illustrations of embodiments of the present invention,
Winding 3 with other windings (not shown) arranged on the inner and outer diameter sides
An electrostatic ring 6 having a sufficiently rounded shape is disposed at the end thereof, and an oil passage 5 is provided in the axial direction in the center thereof. A part of the upper end surface of the winding 3 has an L-shaped cross section facing each other with an interval between them, forming an oil passage 9 in the center of the end of the winding 3 through the outer diameter side surface and the electrostatic ring 6. The inner L-shaped ring 61A and the outer L
It is covered by a mold ring 61B. Also winding 3
A lead wire 31 connected to the end of the winding is insulated by an insulator 32 and led out in the axial direction of the winding.
An insulating cylinder 62 is provided surrounding the lead wire 31 to insulate the lead wire 31 from a frame (not shown), etc., and its base is integrally formed with a collar 63 that covers the end face of the winding to form a ring 64 with an insulating cylinder. If the creepage distance of the base is insufficient, the collar 63 of the base is enlarged by providing a collar 63A as shown in FIG. If the outer diameter of the insulating cylinder 62 is larger than the width of the oil passage 9, a portion of the L-shaped rings 61A, 61B may be widened by a notch 91, as shown in FIG.

L-shaped rings 61A, 6 configured as above
1B and the insulating cylindrical ring 64 are stacked at intervals to form a set, and one or more sets are stacked at intervals. When the flange portion 63A with the enlarged collar 63 comes into contact with the adjacent L-shaped ring 61A, the contact portion may be bent as shown in FIG.

By configuring the insulation of the winding ends and the lead wires led out from the ends as described above, the L-shaped rings 61A and 61B can be manufactured separately, which not only makes handling easier but also reduces the cost. In addition, since there is a gap between the collar 63 of the ring 64 with an insulating tube and the two L-shaped rings 61A and 61B, it is easy to align the insulating tube 62 concentrically, and unlike the conventional case, if the insulating tube is positioned incorrectly, the entire insulating ring Since there is no defective product, the yield is high, and the number of assembly steps is significantly reduced.

As is clear from the above explanation, by separating the L-shaped ring that covers the side surface of the winding end and the upper part of the end surface, and the ring with an insulating tube for insulating the lead wire led out in the axial direction from the winding end, It was possible to obtain an insulating structure that is easy to assemble and is inexpensive.

[Brief explanation of the drawing]

Figure 1 is a diagram of the insulation structure of the winding end with other windings on both sides of the high voltage winding, Figure 2 is a detailed view of the high voltage winding end of Figure 1, and Figure 3 is a conventional lead wire section. FIGS. 4 and 5 are a cross-sectional view and a partial plan view of a conventional insulating ring, respectively, and FIGS. 6 to 10 are illustrations of embodiments of the present invention, and FIGS. 8 is a partial perspective view of a ring with an insulating tube, FIG. 9 is a partial perspective view of an L-shaped ring, and FIG.
The figure is an example of the use of a ring with an insulating tube with its collar bent. 31: Lead line, 61A: Inner L-shaped ring, 6
1B: Outer L-shaped ring, 62: Insulating tube, 63: Collar, 64: Ring with insulating tube.

Claims (1)

[Claims] 1 An insulating structure for the end of the winding of an oil-filled electrical appliance and the lead-out wire led out from the end in the axial direction, with a space between the inner and outer diameter sides of the end of the electrical appliance's winding and the central part above the winding end surface. Inner and outer L-shaped rings with an L-shaped cross section are arranged facing each other with a gap between them, an insulating tube surrounding the lead wire, and an end surface of the winding formed integrally with the tube at its base. 1. An insulating structure for an electrical appliance winding end and a lead-out wire lead-out part, characterized in that a plurality of insulating cylinder pairs and rings each consisting of a collar covering the upper part are stacked at intervals.