Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-01-23
2003-06-10
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S052000, C310S054000, C310S058000, C310S065000
Reexamination Certificate
active
06577027
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a winding structure of induction electric apparatus such as transformer, reactor or the like. The invention relates, more particularly, to a winding structure of induction electric apparatus in which a large number of disc windings are stacked inside an insulating cylinder, and an insulating and cooling fluid is circulated either in the form of forced circulation or natural convection, thereby providing cooling.
2. Background Art
Prior Art 1
Generally, stationary induction electric apparatus such as transformers and reactors consist of an iron core serving as a passage for magnetic flux, a pair of windings serving as a passage for electrical current that interlinks with magnetic flux, an insulator for insulation between the windings, and a clamping device for maintaining their mutual position and withstanding mechanical force. One of the commonly used winding structures in this type of stationary induction electric apparatus involves the use of disc windings.
FIG. 33
is a plan view showing a part of a conventional winding structure of induction electric apparatus.
FIG. 34
is a sectional view of winding structure of induction electric apparatus shown in
FIG. 33
taken along the line XXXIV—XXXIV. As shown in
FIGS. 33 and 34
, a plurality of unit disc windings
3
of disc shape, comprised of conductors wound around radially between an inner insulating cylinder
1
and an outer insulating cylinder
2
, are stacked in axial direction. The horizontal cooling passages
5
are formed in radial direction of the disc winding
3
through the radial placement of a plurality of horizontal spacers
4
each at a regular interval between one disc winding
3
and another.
An inner vertical cooling passage
8
is formed by providing inner vertical spacers
6
between the inner insulating cylinder
1
and the inner periphery side of the disc winding
3
. An outer vertical cooling passage
9
is formed by providing outer vertical spacers
7
between the outer insulating cylinder
2
and the outer periphery side of the disc winding
3
. As shown in
FIG. 34
, an inner blocking plate
10
and an outer blocking plate
11
are placed on the inner insulating cylinder
1
and the outer insulating cylinder
2
at every plural layers of the disc winding
3
, so as to form one cooling block A for every plural horizontal cooling passages
5
. The inner blocking plate
10
blocks the inner vertical cooling passage
8
, and the outer blocking plate
11
blocks the outer vertical cooling passage
9
. The inner blocking plate
10
and the outer blocking plate
11
are alternately placed in the axial direction of the insulating cylinder along the whole circumference.
The disc windings
3
in winding structure of induction electric apparatus with the mentioned construction are cooled by either forcibly taking in the insulating and cooling fluids from the bottom, or by taking in the insulating and cooling fluids through natural convection. However, since the inlet A
1
and the outlet A
2
for the cooling fluids of each cooling block A are alternately reversed between the inside and outside for each cooling block, the cooling fluid that flows through the horizontal cooling passages
5
of each cooling block rises while alternately changing from one direction to the other at each cooling block to cool the disc windings
3
in each cooling block. Note that the flow of the cooling fluid from the bottom (i.e., flow at the upstream end) is indicated by the arrow A
3
, and the flow towards the top (i.e., flow at the downstream end) indicated by the arrow A
4
.
Prior Art 2
FIG. 35
is a sectional view showing a cooling construction of the winding structure of induction electric apparatus disclosed in the Japanese Patent publication (unexamined) No. Hei. 9-293617, which is a winding structure of induction electric apparatus having the mentioned construction shown in
FIGS. 33 and 34
. As shown in
FIG. 35
, an insulating plate
31
for adjusting inner passage flow (hereinafter referred to as “inner flow passage adjustment insulating plate”) is placed along the whole or part of the circumference of the horizontal cooling passage
5
in each cooling block when the blocking plate downstream the cooling flow in the cooling block is the inner blocking plate
10
. In addition, when the blocking plate downstream the cooling flow in the cooling block is the outer blocking plate
11
, an insulating plate
32
for adjusting the outer flow passage (hereinafter referred to as “outer flow passage adjustment insulating plate”) is placed along the whole or part of the circumference of the horizontal cooling passage
5
in each cooling block.
The inner vertical cooling passage
8
is made narrower in some parts by having the mentioned inner flow passage adjustment insulating plate
31
protrude partially into the inner vertical cooling passage
8
. In addition, the outer vertical cooling passage
9
is also made narrower in some parts by having the mentioned outer flow passage adjustment insulating plate
32
protrude partially into the outer vertical cooling passage
9
. This restricts the flow rate of cooling fluid flowing into the horizontal cooling passages
5
downstream the cooling flow in each cooling block, and increases the quantity of cooling fluid flowing into the horizontal cooling passages
5
upstream the cooling flow in each cooling block.
Prior Art 3
FIG. 36
is a sectional view showing a cooling construction of the winding structure of induction electric apparatus disclosed in the Japanese Patent publication (unexamined) No. Hei. 9-293617. This is a winding structure of induction electric apparatus having the mentioned construction shown in
FIGS. 33 and 34
. As shown in
FIG. 36
, when the inner blocking plate
10
is the blocking plate downstream of the cooling flow in the cooling block, an inner flow passage adjustment insulator
33
is placed in each cooling block on the side face of the disc winding
3
on the inner vertical cooling passage
8
side, for either the whole or part of the circumference. In addition, when the outer blocking plate
11
is the blocking plate downstream of the cooling flow in the cooling block, an outer flow passage adjustment insulator
34
is placed in each cooling block on the side face of the disc winding
3
on the outer vertical cooling passage
9
side, for either the whole or part of the circumference.
The mentioned inner flow passage adjustment insulator
33
makes the inner vertical cooling passage
8
narrower in some parts, and the mentioned outer flow passage adjustment insulator
34
makes the outer vertical cooling passage
9
narrower in some parts. This restricts the quantity of cooling fluid flowing into the horizontal cooling passages
5
downstream of the cooling flow in each cooling block, and increases the quantity of cooling fluid flowing into the horizontal cooling passages
5
upstream of the cooling flow in each cooling block.
Prior Art 4
FIG. 37
is a sectional view showing the cooling construction of the winding structure of induction electric apparatus disclosed in the Japanese Patent publication (unexamined) No. Hei. 9-293617. This is a winding structure of induction electric apparatus having the mentioned construction shown in
FIGS. 33 and 34
. As shown in
FIG. 37
, when the blocking plate downstream of the cooling flow in the cooling block is the inner blocking plate
10
, an inner flow passage adjustment insulator
35
is placed in each cooling block on the surface of the inner insulating cylinder
1
on the inner vertical cooling passage
8
side, for either the whole or part of the circumference. In addition, when the blocking plate downstream of the cooling flow in the cooling block is the outer blocking plate
11
, an outer flow passage adjustment insulator
36
is placed in each cooling block on the surface of the outer insulating cylinder
2
on the outer vertical cooling passage
9
side, for either the whole or part of the circumference.
The mentioned inner flow
Hayase Gaku
Hoshino Takashi
Ichinose Yuta
Kotoh Satoru
Unemi Akihiro
Gonzalez Julio C.
Leydig , Voit & Mayer, Ltd.
Mitsubishi Denki & Kabushiki Kaisha
Ramirez Nestor
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