JPS636133B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of assembling a stationary induction appliance in which a winding is housed within an insulating structural member.

BACKGROUND OF THE INVENTION With the increase in power demand in recent years, power transmission voltage has been increased and power transmission and substation equipment has increased in capacity. Due to the rise in power transmission voltage, the insulation distance inside and outside of power transmission and substation equipment is inevitably larger than before, and even with recent improvements in insulation technology, it is currently impossible to suppress the increase in insulation distance. It is. In addition, as power transmission voltage increases, the capacity of power transmission and substation equipment is increasing, and equipment is becoming larger than ever. However, it has traditionally been necessary to rely on rail transport to install equipment, particularly at substations, among power plants and substations where power transmission and substation equipment is installed, but the limits of rail transport have changed. It hasn't, and it won't change in the future. Therefore, in order to transport power transmission and transformation equipment, such as transformers, which will continue to rise in power transmission voltage and increase in capacity, it has become necessary to transport transformers in parts. There are various ways to transport the parts separately, but if you assemble them on-site, the conditions for the equipment will be worse than if you assemble them in a factory, and there is a risk that they will be affected by dust, contamination, moisture absorption, etc.

The present invention has been made in consideration of the above points, and
The objective is to develop a method for assembling stationary induction electric appliances that can reduce on-site reassembly work by transporting stationary induction electric appliances while keeping the insulation condition of the windings in good condition when they are transported separately. Our goal is to provide the following.

Hereinafter, the present invention will be explained with reference to an embodiment shown in FIGS. 1 to 10, taking a static induction electric device such as a transformer as an example. As shown in FIG. 1, the transformer 10 has the contents of the transformer stored in a tank 11 together with an insulating cooling medium such as an insulating oil 12. The contents of this transformer are assembled by surrounding and insulating the entire winding 13 consisting of low-voltage and high-voltage windings with an insulating structural member 14, and incorporating an iron core 15. A radiator 17 provided outside the tank 11
The lower part is connected to the insulating structural member 14 by a pipe 1a, and the upper part is connected to the inside of the tank 11 by a pipe 17b. A lead wire (not shown) drawn out from the winding 13 is connected to a bushing 18 provided on the upper surface of the tank 11.

The winding 13 is connected to the low voltage winding 21 as shown in FIG.
Shield rings 21a, 21a and 22a, 22a are provided at both ends of the high voltage winding 22, and are surrounded by an insulating member 23 such as a breath board. Furthermore, insulating member 2
An insulating structure member 24 is provided around 3, and this insulating structure member 24 includes a cylindrical central insulating cylinder 25a,
25b and an insulating cap 26 covering both ends thereof.
a and 26b, each of which is hermetically joined at a joining seal portion 28 so as to be airtight and oiltight. These central insulating cylinders 25a, 25b and insulating caps 26a, 26b are made of an insulating material having high mechanical strength and excellent dielectric strength, for example, a reinforcing fibrous material such as glass fiber or polyethylene terephthalate fiber. It is made of an insulating member formed by impregnating and curing a synthetic resin such as epoxy resin or polyester resin. The upper insulating cap 26a is formed with a plurality of insulating oil inlets 27, and the lower insulating cap 26b is similarly formed with an inlet, although not shown.

Central insulation members 25a, 25b and insulation cap 2
As shown in FIG. 3, each of the joint seal parts 28 of 6a and 26b has a seal member 28a, such as oil-resistant packing, sandwiched between the respective overlapping parts, and the joint seal part 28 on the right side of the figure, that is, the outside, has a seal member 28a, for example, oil-resistant packing. It is tightened along the outer circumference by a tightening insulating band 28b. Note that the insulation caps 26a and 2
In consideration of the sealing effect of the joining seal portion 28, if the insulating caps 26a and 26b are formed into a U-shaped ring shape in cross section so that they become slightly narrower toward the central insulating cylinders 25a and 25b, Although a sufficient sealing effect can be obtained in the inner joint seal portion 28 without any particular tightening, a pressing member may be further provided along the inner circumference of the inner joint seal portion 28, although not shown in the drawings. .

Each insulating cap 26a, 26b has an internal insulating cooling medium such as insulating oil 12 as shown in FIG.
An outflow inlet 27 is opened to allow the inflow and outflow of the insulating pipe 34 to be connected in an oil-tight manner. The insulation tube 34 is the fifth
As shown in the figure, collect a plurality of pieces in a common insulation tube 36,
It can be connected to an insulating pipe 38 outside the tank 11 via a connecting pipe 37 that penetrates the wall of the tank 11 in an oil-tight manner, and can be connected to a radiator (not shown).

Next, the effects of the transformer configured as described above will be explained. When disassembling and transporting the transformer shown in FIG.
5. Disassemble into winding 13. As shown in FIG. 2, the winding 13 is an insulating structural member surrounded by central insulating cylinders 25a, 25b and insulating caps 26a, 26b at both ends, and joined by a joining seal 28 in an oil-tight manner. Since the insulating structure member 24 is housed in the insulating structure member 24, dry air or nitrogen gas is sealed inside the insulating structure member 24, and the inlet/outlet port 27 is hermetically sealed. The entire winding 13 housed in the insulating structural member 24 in this manner is transported from the factory to the site. By assembling the transformer by assembling the winding 13 into the core at the site, the winding 13 remains covered with the insulating structural member 24 and remains in a good insulation condition at the factory without being contaminated or absorbing moisture. Can be incorporated. Further, since the winding 13 is surrounded by the insulating structural member 24, the dielectric strength against the ground potential of the iron core 15 and the tank 11 is excellent, and the winding 13 is surrounded by the insulating structural member 24.
3 and the inside of the tank 11 can be reduced. Furthermore, there is an advantage that the cooling effect of cooling the winding 13 by the insulating oil 15 is increased.

Next, other embodiments of the present invention will be described in FIGS. 1 to 5.
The same parts as in the figures are given the same reference numerals as in Figures 6 to 1.
This will be explained with reference to FIG. As shown in FIGS. 6 to 10, the joint seal portion 28 between the central insulating cylinders 25a, 25b and the insulating caps 26a, 26b
is a diagonal joint as shown in Figure 6, a fit joint as shown in Figures 7 and 8, or a fit in a recess formed with a U-shaped cross section as shown in Figures 9 and 10. These can be constructed by inserting rubber packing or a sealing member such as an O-ring into the joint surface and tightening it in the direction along the central axis when forming an insulating structural member.

In addition, as shown in FIG. 11, when the left side of the drawing is the center axis side, the outer periphery of the joint seal portion 28 is tightened with the insulating band 28b as described above, but the inner joint seal portion 28 is tightened with the insulating cap. 26
It may also be tightened from the inside of b using the tightening insulating band 28c.

Note that, as shown in FIG. 12, a gas insulated transformer may be used in which the space inside the tank 11 is filled with an insulating gas 40 such as SF ₆ gas as an insulating cooling body. In addition, a fluorocarbon liquid 41, for example, is placed as an insulating cooling medium inside the insulating structural member 24 housing the winding 13, and connected to a radiator 43 provided outside the tank 11 via an insulating tube 42 for evaporative cooling. It is also possible to configure a transformer using the following method.

Furthermore, as described above, the insulating structure member 24 is divided into three parts, but it can also be divided into two or more than three parts. Furthermore, the winding can be constructed by individually surrounding the high voltage winding and the low voltage winding with insulating structural members.

As explained above, according to the assembly method of the present invention, the winding is surrounded by an insulating component having excellent mechanical strength and dielectric strength, and the winding is insulated from the winding when the transformer is disassembled and transported. By transporting the components as one piece to the site and then assembling the insulating component containing the winding as one piece at the site during reassembly, the insulation treatment condition of the winding can be maintained in good condition without staining or moisture absorption. On-site reassembly work can be easily carried out while maintaining the insulation state, and work time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional front view showing a transformer assembled by the method of the present invention, and FIGS.
The figures each show the main parts of a transformer according to the method of the present invention,
2 is a sectional perspective view, FIGS. 6 and 4 are sectional views, FIG. 5 is a partially sectional plan view, and FIGS. 6 to 12 each show other embodiments of the present invention. Figures 6 to 11 are sectional views showing the main parts, and Figure 12 is a sectional view showing the main parts.
The figure is a partially cutaway front view. 10... Transformer, 11... Tank, 12... Insulating oil, 13... Winding wire, 15... Iron core, 17, 43
... Heat sink, 14, 24 ... Insulating structural member, 25
a, 25b... central insulating cylinder, 26a, 26b...
Insulating cap, 27...Outlet/outlet, 28...Joint seal portion, 28a...Sealing member, 28b...Tightening insulating band, 41...Freon liquid.

Claims (1)

[Claims] 1. In the method of assembling stationary induction appliances in which the core and winding are transported separately and assembled at the installation site, the winding is housed inside an insulating structural member with high mechanical strength and high dielectric strength, and this insulating structural member is It consists of an insulating cylinder and an insulating cap that closes both ends of the central insulating cylinder, each of which has an inlet/outlet portion through which an insulating cooling medium can flow in and out, and the winding is sealed by the insulating structural member during transportation. A method for assembling a stationary induction electric appliance, characterized in that the winding is assembled into an iron core while the winding is maintained in a sealed state by the insulating structural member during assembly.