JPH0922823A - Stationary induction electrical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stationary induction electrical equipment with a lead wire insulation supporting structure with an improved voltage resistance against a lead wire where an extremely high voltage is applied in a narrow space part in a lead duct. SOLUTION: A stationary induction electrical equipment has a lead connecting device where an insulation lead wire in that the outer periphery of a conductor is covered with an insulation paper via a lead supporting plate in a lead duct. The equipment is constituted of an insulation barrier 5 which is wound by providing an oil read outside the insulation lead wire, a supporting plate 6 which is divided into at least two portions by pinching the insulation barrier, a lead supporting post 9 being fixed to the lead duct, and insulation studs 7 and 8 for fixing the supporting plate to the lead supporting post, thus weakening the creepage electrical field strength at the lead wire side of the supporting plate for pinching the lead wire and reducing the voltage which the supporting plate takes care of and hence relaxing the electrical field strength applied to the supporting plate for supporting the lead wire and reducing creepage- responsible voltage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static induction machine such as a transformer or a reactor, and more particularly to a static induction machine having a lead wire insulation support structure in a lead duct section.

[0002]

2. Description of the Related Art Usually, a transformer lead wire is led out from a winding end of a transformer to a lower terminal of a bushing. On the way, a tank container body for accommodating the contents of a transformer holds the bushing through a lead duct. It may be configured to connect to the bushing pocket. In this case, in order to give the lead wire a certain withstand voltage to the lead duct, the insulated lead wires with insulation coating should be held at multiple points inside the lead duct by the lead support plates to ensure a certain insulation distance. ing.

When the voltage applied to the lead wire is high,
As a means for increasing the creeping length of the support plate from the lead wire to the lead duct in order to improve the withstand voltage, the lead support plate is not fixed directly from the lead duct but the lead support column 9 is temporarily fixed as shown in FIG. After being fixed to the lead duct 1, the lead supporting plate 6 supporting the lead wires 3 is connected and fixed to the lead supporting column 9 (Japanese Patent Laid-Open No. Sho 5).
7-194511).

Regarding the lead support structure inside the transformer contents storage tank container, not inside the lead duct,
Some proposals have been made to prevent impurity particles from precipitating on the upper surface of the lead support plate. For example, FIG. 9 of a plan view of a lead wire support device inside a conventional transformer tank.
As shown in FIG. 10 which is a vertical cross-sectional view of a main portion thereof, in the vertical rising portion of the lead wire 3, the vertical rising portion of the lead wire 3 having a lead conductor therein and the supporting plate 6 supporting the lead wire 3 are formed. A plurality of spacers 4 and insulating barriers 5 each having an inclined surface that tapers from the upper surface of the support plate 6 toward the rising direction of the lead wires 3 are radially arranged, and leads are provided via the spacers 4 and the insulating barriers 5. The wire 3 is supported and fixed to the support plate 6. In addition, 7 is an insulating stud, 15 is a winding wire, 16 is an iron core clamp, and 17 is an iron core (see Japanese Patent Laid-Open No. 54-65328).

The above-mentioned conventional technique is useful for reducing the shared voltage applied to the surface of the insulator or preventing the precipitation of impurity particles when the voltage applied to the lead wire is not so high or in the case of the lead support structure in the tank container. it is conceivable that.

[0006]

However, the voltage applied to the lead wire is 500KV class transformer or 1000V.
When the voltage is extremely high like a KV class transformer, or when the lead duct is inside or the lead duct is horizontally arranged, the withstand voltage performance may not be sufficient or the withstand voltage performance may decrease.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a lead wire to which a very high voltage is applied, regardless of the arrangement of the lead duct in a narrow space within the lead duct. Another object of the present invention is to provide a static induction electric device having a lead wire insulating and supporting structure which is excellent in withstand voltage.

[0008]

In order to achieve the above-mentioned object, the first aspect of the present invention is to provide an insulating lead wire in which the outer circumference of a conductor is covered with an insulating paper in a lead duct through a lead supporting plate. In a static induction machine having a lead connecting device to be installed, an insulating barrier which is provided with an oil passage on the outside of the insulating lead wire and is wound, and at least two supporting plates which sandwich and support the insulating barrier. And a lead support pillar fixed to the lead duct, and an insulating stud fixing the support plate to the lead support pillar.

According to a second aspect of the present invention, in the static induction electric device according to the first aspect, the lead supporting plate has a shape in which a corner portion on the lead duct side is cut off. According to a third aspect of the present invention, in the static induction electric device according to the first aspect, a plurality of insulating barrier layers are arranged outside the insulating lead wire,
Further, it is characterized in that a spacer shorter than the length of the insulating barrier in the lead axis direction is arranged in the oil gap between the insulating barriers.

According to a fourth aspect of the present invention, in the static induction electric device according to the first aspect, the cross-sectional shape of the lead duct is a cylinder, and a press board is arranged at least below the inner peripheral surface of the lead duct. It is characterized by having done.

According to a fifth aspect of the present invention, in the static induction electric device according to the first aspect, among the insulating barriers arranged outside the insulating lead wire, only the outermost insulating barrier which is in direct contact with the lead support plate is the lead. The feature is that the axial length is reduced.

[0012]

According to the static induction device of the present invention, by disposing a plurality of insulating barriers having oil passages on the outer side of the insulating lead wire, the creeping electric field strength of the support plate holding the lead wire on the lead wire side can be improved. Since the supporting plate is weakened and the voltage shared by the supporting plate is fixed by fixing the supporting plate to the lead duct via the lead supporting column, the relaxation of the electric field strength applied to the supporting plate supporting the lead wire and the creepage sharing voltage It is possible to reduce the amount, and it is possible to bring about high insulation performance.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a first embodiment of the present invention (corresponding to claim 1).
2 is a cross-sectional view of the lead wire supporting device in the lead duct in the radial direction of the lead duct, and FIG. 2 is a longitudinal cross-sectional view of a main part of the lead supporting device of FIG.

As shown in the figure, in the insulated lead wire 3 insulatively covering the lead conductor 2, the insulating barrier 5 is arranged only in the multi-layered lead wire supporting portion via the oil gap holding spacer 4. The insulating bar rear 5 is held by being sandwiched from the outside of the insulating bar rear 5 by the lead supporting plate 6 which is divided into two, and the lead supporting plate 6 is fixed to the lead supporting column 9 by the insulating stud 7. Further, the support seat 11 and the lead support column 9 which are welded and fixed to the cylindrical lead duct 1 are tightened and fixed by the insulating stud 8 via the el-angle 10 which is an L-shaped insulating member.

Since the lead supporting portion in the lead duct 1 is constructed as described above, the creeping electric field strength of the lead supporting plate 6 on the insulating barrier 5 side is almost inversely proportional to the distance from the center of the lead conductor 2. Get smaller. By interposing the lead support column 9 between the lead support plate 6 and the lead duct 1 to increase the total creepage distance of the support plate 6 and the support column 9, or to shorten the creepage distance of the support plate 6. By doing so, the voltage shared by the support plate 6 (shared voltage) is reduced.

Also on the side of the lead duct 1 which is at the ground potential, the supporting seat 11 for fixing the supporting column 9 has a flat shape having a curvature on the side of the lead wire, so that the electric field strength thereof is relaxed and the support of the lead is also supported. L between the pillar 9 and the support seat 11
Since the el-angle 10 which is a character-shaped insulating member is arranged, the discharge from the ground electrode side is unlikely to occur and progress.

As described above, according to this embodiment, relaxation of the local electric field strength applied to the creeping surface of the lead support plate 6 on the high voltage side,
The creeping voltage sharing can be reduced, and the insulation strength against creeping discharge can be increased. Also, discharge is generated from the support seat 11 welded and fixed to the lead duct 1 at the ground potential.
Since the lead wire supporting apparatus according to the present embodiment is less likely to progress, it has a well-balanced insulation performance in a lead duct and an excellent insulation performance against a high voltage.

FIG. 3 is a sectional view in the radial direction of the lead duct of the lead wire support device according to the second embodiment (corresponding to claim 2) of the present invention. The same parts as those of the above-described first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The present embodiment differs from the lead wire support device of the first embodiment in that the lead wire support plate 6 has a shape in which a corner facing the lead duct 1 is cut out. Support plate 6
With such a shape, the creepage distance from the insulating barrier 5 to the lead duct 1 becomes shorter. Therefore, the voltage shared by the supporting plate 6 on the creeping surface is reduced, and the insulation performance is improved as compared with the first embodiment in the same lead duct diameter dimension and the same insulation barrier structure.

FIG. 4 is a vertical sectional view of a lead wire supporting device according to a third embodiment (corresponding to claim 3) of the present invention. In addition,
The same parts as those of the above-described first embodiment are designated by the same reference numerals, the description thereof will be omitted, and only different parts will be described.

In the present embodiment, the length of the spacer 4 between the insulating lead 3 and the insulating barrier 5 arranged outside the insulating lead 3 and the length of the spacer 4 between the insulating barriers 5 is determined by the axis of the insulating lead of the insulating barrier. The length is shorter than the length in the direction, and the spacer 4 is arranged inside the opening end of the insulating barrier 5.

With such an insulating barrier structure, the insulating barrier 5 and the spacer 4 are provided from the insulating surface of the insulating lead wire 3 to the outermost position of the insulating barrier 5.
This prevents the end faces of the from lining up on one plane.

When the insulating barrier 5 and the end face of the spacer 4 are aligned on one plane, the thickness of the insulating paper of the insulating lead wire 3 is not sufficient, and when the radius of the spacer 4 is large and the number of insulating barrier layers increases. The creeping voltage on the plane becomes large, and the creeping discharge easily occurs. Therefore, by making the length of the spacer 4 shorter than the length of the insulating barrier 5 so that the end faces of the insulating barrier 5 and the spacer 4 are not aligned, the creeping length through the end face of the spacer 4 can be greatly increased. The insulation performance can be further improved as compared with the second embodiment.

FIG. 5 is a sectional view in the radial direction of the lead duct of the lead wire support device according to the fourth embodiment (corresponding to claim 4) of the present invention. The same parts as those in the above-described first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the grounding barrier 12 made of a press board or the like is arranged as close as possible to only the lower part of the inner peripheral surface of the horizontally arranged lead duct 1. Small foreign matter is likely to collect in the lower inside of the lead duct 1, and in the case of a bare electrode, dielectric breakdown may occur at a low voltage with a low probability. However, by insulatingly protecting the bare electrode portion, it is possible to prevent dielectric breakdown at a low voltage. Therefore, by disposing the ground barrier 12 on the lower surface of the inner circumference of the lead duct 1 as in this embodiment, a lead wire support structure having high insulation reliability can be obtained.

In addition, the range of attachment of the ground barrier 12 to the lower surface of the inner circumference of the lead duct 1 is preferably 60 ° or more from the vertical line with respect to the circumferential direction over the entire length in the length direction of the lead duct in order to prevent foreign matter accumulation. When the voltage becomes higher and the reliability is required to be higher, it is desirable to dispose the ground barrier 12 over the entire inner surface of the lead duct 1 as shown in FIG.

In the case of this embodiment, the arrangement of the ground barrier 12 is limited to the horizontally arranged lead duct, but as a modification of this embodiment, it is not limited by the arrangement of the lead duct. . Further, the case where the horizontal inclination of the lead duct is within 45 ° from the horizontal position is also included in this embodiment.

FIG. 7 is a vertical sectional view of a lead wire supporting device according to a fifth embodiment (corresponding to claim 5) of the present invention. In addition,
The same parts as those in the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted.

The lead wire supporting device of this embodiment differs from the above-mentioned embodiments in that an insulating barrier 14 is provided also in the general part of the insulating lead wire 3 and the lead wire supporting portion has a short insulating barrier. 13 is additionally provided. Such a structure is effective when the thickness of the insulating paper layer of the lead wire 3 is relatively small, and the action and effect of the lead wire supporting device are the same as those in the above-mentioned embodiments.

In each of the above embodiments, the lead wire support plate 6, the support pillars 9 and the L-shaped insulator 10 are preferably made of a press board material made of kraft pulp and having a high withstand voltage. Among the insulating studs, the insulating stud 7 for fastening and fixing the support plate 6 and the supporting column 9 is exposed to a high electric field when the lead wire voltage is high, and therefore it is desirable to use the voidless FRP.

[0031]

As described above, according to the present invention, a plurality of insulating barriers having oil passages are provided outside the lead wire, and the outermost insulating barrier is divided into at least two outer peripheries. The support plate is clamped and fixed to the lead support column fixed to the lead duct by the insulating studs, so the electric field strength applied to the creeping surface of the lead support plate is mitigated and the creepage is shared. Since the voltage also decreases at the same time, it is possible to provide a static induction electric device having a lead wire support structure having excellent insulation performance against high voltage of the lead wire.

[Brief description of drawings]

FIG. 1 is a sectional view in the radial direction of a lead duct according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a sectional view of a second embodiment of the present invention in the radial direction of the lead duct.

FIG. 4 is a vertical sectional view of a third embodiment of the present invention.

FIG. 5 is a sectional view of a fourth embodiment of the present invention in the radial direction of the lead duct.

6 is a sectional view of a modification of the fourth embodiment of FIG.

FIG. 7 is a vertical sectional view of a fifth embodiment of the present invention.

FIG. 8 is a radial cross-sectional view of a lead wire supporting device in a conventional lead duct.

FIG. 9 is a plan view of a conventional lead wire support device inside a transformer tank.

FIG. 10 is a longitudinal sectional view of FIG. 9;

[Explanation of symbols]

1 ... Lead duct, 2 ... Lead conductor, 3 ... Insulation lead wire, 4 ... Spacer, 5 ... Insulation barrier, 6 ... Support plate, 7
… Insulation studs, 8… Insulation studs, 9… Support pillars, 10
… El angle, 11… Support seat, 12… Ground barrier,
13, 14 ... Insulation barrier, 15 ... Winding, 16 ... Iron core clamp, 17 ... Iron core.

Claims (5)

[Claims] 1. A static induction machine equipped with a lead connecting device in which an insulating lead wire coated with insulating paper is arranged on the outer circumference of a conductor in a lead duct via a lead support plate, wherein oil is provided outside the insulating lead wire. An insulating barrier which is provided with a path and is wound, and at least two which sandwich and support the insulating barrier.
A static induction machine comprising: a support plate divided into two parts; a lead support post fixed to the lead duct; and an insulating stud fixing the support plate to the lead support post. 2. The static induction electric device according to claim 1,
A static induction machine characterized in that the lead support plate has a shape in which a corner portion on the lead duct side is cut off. 3. The static induction electric device according to claim 1, wherein
A static induction machine characterized in that a plurality of insulating barriers are arranged outside the insulating lead wire, and a spacer shorter than the length of the insulating barrier in the lead axis direction is arranged in an oil gap between the insulating barriers. 4. The static induction electric device according to claim 1, wherein:
A static induction machine characterized in that the cross section of the lead duct is cylindrical, and a press board is arranged at least below the inner peripheral surface of the lead duct. 5. The static induction electric device according to claim 1, wherein
Among the insulating barriers arranged on the outside of the insulating lead wire, only the outermost insulating barrier which is in direct contact with the lead supporting plate has a reduced length in the axial direction of the lead.