JPS5821407B2 - Large capacity three phase transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a large-capacity three-phase transformer, and more particularly to a large-capacity three-phase transformer in which a plurality of unit transformers are installed separately and connected in three phases.

In view of the recent electricity situation, the power generation capacity of power plants has been increasing.

Due to this increase in generation capacity, multiple generators may be installed, but since the single unit capacity of the transformer connected to these generators will also increase, it is usually divided into each phase. A three-phase transformer configuration is used.

However, in recent years, transportation conditions have become increasingly severe due to the poor location conditions of power plants and substations, and even if the three-phase transformer mentioned above is used, single-phase transformers themselves are becoming larger due to the increase in power generation capacity, making it difficult to transport them. The reality is that the above problem is occurring.

For this reason, four so-called split-type transformers, in which a single-phase transformer is divided into multiple parts, have been adopted to solve the transportation problem.

Incidentally, recently, there has been a tendency to install transformers underground in pumped storage power plants in mountainous areas and substations in urban areas due to the surrounding conditions for installing transformers.

However, as a result, there is a demand for reducing the installation space of the transformer as much as possible due to problems such as civil engineering costs.

Especially when it comes to split-type large-capacity three-phase transformers, it is economically advantageous to consider the installation space.
Due to the fact that multiple transformers are arranged side by side, in the event of an accident, it may be necessary to take out the transformer, so the installation space must take this into consideration.

FIG. 1 shows an example of the wiring of a general θ large-capacity three-phase transformer in which a plurality of transformers are arranged separately.

The figure is an example of interconnecting two low-voltage circuits and one high-voltage circuit.Single-phase transformers 1, 2.3 are arranged in one row to form a transformer group 50.
Single-phase transformers 4, 5, and 6 are arranged in a row 17c to form a transformer group 5.
1, and the single-phase transformers 1, 2, 3 and 4, 5゜56 have their low voltage sides connected in a three-phase triangular connection (u, v2w phase delta connection) in the low voltage ducts 1 and 8, and the low voltage bushing 9,10,
11 and 12, 13, 1. The first (not shown)
, and a second low voltage circuit.

In addition, the high pressure side of each phase is connected to high pressure ducts t) 15 and 16, respectively.
．． Cable head 1 on the high voltage side is connected in parallel within 17.
It is connected to a high voltage cable (not shown) via terminals 8, 19, and 20.

Note that 21° and 22 are neutral point bushings.

The arrangement of the large-capacity three-phase transformer connected in this way; the outline of the configuration is shown in FIGS. 2 and 3.

Unit transformers 1, 2, and 3 are arranged in one row to form one transformer group 50, and other unit transformers 4, 5, and 6 similarly form one transformer group 51. .

Then, the transformer groups 50 and 51 are arranged in parallel to create a transformer pan.
Configure Rina.

Further, each unit transformer 1, 2 . and 3 are connected to each unit transformer 4 of the transformer group 51 via the low voltage duct 7,
5. and 6 are electrically connected to each other via the low voltage duct 8, and the adjacent in-phase unit transformers 1 and 4, 2 and 5, and 3 and 6 are connected to the high voltage duct 1 between the transformer groups 50 and 51.
5.16. and 17, and the cable head 20 (only one phase is shown in FIG. 3, but each phase is the same).

) connected to the power grid.

In addition, from each low voltage duct 7.8, each transformer group 50, 51
Phase separation busbars 21 and 22 are drawn out as shown in the bottom of FIG.

However, although the above-mentioned phase separation buses 21 and 22 are drawn out in the direction in which the unit transformers of the transformer group are arranged, that is, in the lower part of the drawing, there is usually a three-phase load special voltage regulator for adjusting the voltage. (Hereinafter referred to as LVR.

), it required some effort to draw out the phase separation bus bar, which had the disadvantage that drawing out the bus bar was complicated.

The present invention has been made in view of the above points, and its object is to provide a large-capacity three-phase transformer that allows easy extraction of a phase-separated bus bar.

Furthermore, another object of the present invention is not only to make it easy to draw out the phase separation bus, but also to easily transform the unit transformer without increasing the installation space even if it becomes necessary to replace the unit transformer due to an accident or the like. The point is that it is possible to carry out the containers.

In the present invention, the high-voltage ducts located at both ends of each transformer group are raised from the corresponding ends of the unit transformers, and the high-voltage ducts located at the center are raised from the center of the unit transformer. The first purpose is to draw out a phase separation bus bar from between adjacent high voltage ducts.In addition to the above points, at least one unit transformer The second objective is achieved by providing a space corresponding to each part.

The present invention will be described in detail below based on embodiments of the drawings.

FIG. 4, FIG. 5, and FIG. 6 are detailed diagrams of a large-capacity three-phase transformer according to an embodiment of the present invention.

Between the cores, transformer group 501 is unit transformer 101.1
02. and 103 are arranged in one row, and the other transformer group 502 is formed in the same way with each unit transformer 104105 and 106.

The transformer groups 501 and 502 are arranged in parallel to form a transformer bank, but in the present invention, the transformer groups 501 and 502 are arranged in parallel.
2 in parallel, each unit transformer 101 and 104, 102 and 105 of the same phase of the transformer groups 501 and 502, and 1
A space A corresponding to at least one unit transformer is provided between 03 and 106.

That is, as shown in Fig. 4, the width 12 of space A is 11 for the unit transformer width 11 between the unit transformers between different transformer groups.
They are arranged so that ≦12.

Further, low voltage ducts 109, 11Q and 111 electrically connect the low voltage sides of each unit transformer 101 and 104, 102 and 105, and 103 and 106, and high voltage ducts N12 and 113 electrically connect the high voltage sides of each unit transformer 101 and 104, 102 and 105, and 103 and 106. and 114 are extended above each unit transformer and are installed so as to straddle the space A.

In addition, LVRs 107 and 108 for voltage adjustment are connected to each transformer group 501 and 502, and a space A' corresponding to one unit transformer is also provided between these LVRs 107 and 108.
In other words, the distance 12 between the two is the unit transformer width (two LVR width)
They are installed with an interval of 41≦12 from the right side.

The LVRs 107 and 108 are also connected by a low voltage duct 115 that electrically connects the low voltage sides of the unit transformers arranged across the space A'.

Each unit transformer 101 and 104, 102 and 105, and 1
Each low pressure duct 109,1 arranged between 03 and 106
10 and 111 are connected to a common low voltage duct 116 arranged above the space, and the common low voltage duct 116 connects each unit transformer 101 to 10 of the transformer group; 501 and 502.
The low pressure side of 6 is connected to each of the three phases at once.

The tip of this common low pressure duct 116 is connected to the LVR 107 and 1
The low voltage side of each transformer group 501 and 502 is electrically connected to the LvRs 107 and 108 via the extended portion and the low voltage duct 115.

In this embodiment, the high voltage ducts 112 and 114 located at both ends of each transformer group 501 and 502 are raised from the corresponding ends and portions of the unit transformers 101, 104 and 103, 105 at both ends, High pressure duct 11 located in the center
3 stands up the central part of the unit transformers 102, 105, and places them above each unit transformer 101 to 106, and furthermore, connects each transformer group 501, 502 to a phase separation bus ( ul s Vl ylwl Aisima 125 p
u2 p V2 s 'W2 phase 126) is connected to the high pressure ducts 112, 113, 114 and drawn out to the left side as shown in FIG.

However, in this embodiment, the common low voltage duct 116 is connected to the opposing unit transformers 101 to 1 of each transformer group 501 and 502.
It is reinforced with an integrated gate-shaped stay that has one end of the 06IC fixed.

Of course, the same thing may be done between the LVRs 107 and 108 facing each other.

FIG. 5 shows this example, in which an integral portal stay 124 whose one end is fixed to the LVR 107 and 108 is connected to the LVR l
By doing this, the common low pressure duct 116 extended into the space A' between 07 and 108 is reinforced.
The common low pressure duct 116 will be firmly supported,
Along with this, each low pressure duct 109.110. and 111 are also firmly supported, resulting in an overall durable structure.

Incidentally, the stay does not have to be an integral piece, and even if it is independent for each unit transformer, if one end is fixed to it, the other end can support and reinforce the common low voltage duct.

121122 and 123 are high voltage cable heads for each phase.

With this configuration, the high pressure ducts are formed at equal intervals, so the phase separation bus can be drawn out using the space between the high pressure ducts, and when drawing out the phase separation bus, the conventional LVR There's nothing like that,
There is no need to make any special arrangements for drawing out the phase separation bus bar, and the phase separation bus bar can be easily drawn out in one direction.

In particular, since a common low-voltage duct is used, the tasks that were conventionally drawn out from the low-voltage ducts for each transformer group can now be carried out using a single low-voltage duct, which not only simplifies the overall configuration of the transformer, but also improves work efficiency. It also has the effect of improving sexual performance.

Furthermore, in the event that an accident occurs and a unit transformer needs to be replaced, it is assumed that the loading and unloading exits are on the unit transformer 103 and 106 sides. The farthest unit transformer 101 or 1 when viewed from the exit
04, as long as there is space A, by pulling out the unit transformer 101 or 104 where the accident occurred from space A, it becomes possible to carry it out regardless of other unit transformers.
its replacement.

It can be easily done without spending a lot of time, and
Unit transformers 101, 102. Compared to a system that provides space for carrying out transformers on both the left side of unit transformers 104, 105, and 106, and the right side of unit transformers 104, 105, and 106, the space for carrying out the transformers is only half that, and the overall installation space is increased. It has the effect of leaving you with nothing to do.

In the above-mentioned embodiment, a space is provided between the unit transformers in each transformer group, and the high-wire ducts located at both ends of each transformer group are connected to the phase correspondence of the unit transformers at both ends. The high voltage duct located at the center stands up from the end of the unit transformer, and the phase separation bus bar is drawn out from between adjacent high voltage ducts almost parallel to the high voltage duct. However, in order to achieve the effect of easily drawing out the phase separation generatrix, a particular space is not required, and the above-mentioned configuration can achieve the purpose regardless of the space.

Furthermore, in the above-mentioned embodiment, two transformer groups each having three unit transformers in a row are arranged in parallel, and there are six unit transformers in total. However, the present invention is not limited to this. There is no limit to the number of vehicles.

Furthermore, the above-mentioned one installs two transformer groups at the same time,
The high voltage side is connected in parallel, but if another transformer group is added to the existing transformer group, the high voltage side may be connected in series.

Further, although this embodiment has been described with reference to an IC buried in a basement or the like, it goes without saying that the same applies even if the IC is buried above ground.

According to the large-capacity three-phase transformer of the present invention as described above, the high-voltage ducts located at both ends of each transformer or group are connected to the corresponding ends of the unit transformer, and the high-voltage duct located at the center is connected to the unit transformer. The unit transformer is placed above the unit transformer with the riser rising from the center of the transformer, and the phase separation bus bar is drawn out from between adjacent high voltage ducts, so the high voltage ducts are spaced evenly apart. The phase-separated bus bar can be drawn out using the space between the high-pressure ducts, there is no obstacle to drawing out the bus bar, and the bus bar can be easily drawn out without any devising.

Furthermore, in addition to the above-mentioned points, a plurality of transformer groups consisting of a plurality of unit transformers arranged in one row are arranged with a plurality of transformers, and at least one unit transformer is arranged between the unit transformers between these transformer groups. Since a space is provided for each unit transformer, even if an accident occurs and a unit transformer needs to be replaced, this space can be used to replace a group of transformers arranged in parallel. Both unit transformers can be easily carried out and replaced, and no special large installation space is required, so this is very effective when used in this type of transformer.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a typical wiring example of a large-capacity three-phase transformer.
Fig. 2 is a plan view showing the arrangement of a conventional large-capacity three-phase transformer, Fig. 3 is a front view thereof, and Fig. 4 is a plan view of a large-capacity three-phase transformer showing an embodiment of the present invention. , FIG. 5) is a front view of the main body, and FIG. 6) is a side view from the outside. 1.2,3,4,5,6,101,102゜103.1
04,105,106...Unit transformer, 7.8,10
9,110,111,115...low pressure duct, 15.
16, 17, 112, 113° 114... High pressure duct, 50, 51, 501° 502... Transformer group, 107
, 108...Three-phase load voltage regulator, 116...Common low pressure duct, 117a. 111b...neutral point, 124...stay, 21,2
2゜125.126...Phase separation bus, A, A'...
·space.

Claims (1)

[Scope of Claims] 1 A plurality of transformer groups each having a plurality of unit transformers arranged in a row are arranged in parallel, and a low voltage duct is connected between the unit transformers of the transformer group. The unit transformers of the same phase in parallel and different transformer groups are electrically connected via high voltage ducts, and a phase separation bus bar is connected to the low voltage duct, wherein the high voltage duct includes: The unit transformers located at both ends of each transformer group are raised from the corresponding ends, and the unit transformer located at the center is raised from the center of the unit transformer above the unit transformer. A large-capacity three-phase transformer, characterized in that the phase separation bus bar is drawn out from between the adjacent high-voltage ducts.2 The low-voltage duct is arranged above the unit transformer, and the low-voltage The ducts are collectively connected by a common low-voltage duct arranged between the transformer groups along the arrangement direction of the unit transformers, and the phase separation bus is connected to the common low-voltage duct so as to be substantially connected to the high-voltage duct. A large-capacity three-phase transformer 3 according to claim 1, characterized in that the transformers are drawn out in parallel.A three-phase load special voltage regulator is connected to each of the transformer groups, and each of the three-phase loads is connected to a three-phase load special voltage regulator. 4. The large-capacity three-phase transformer according to claim 2, wherein the voltage regulator is electrically connected to the transformer group via a low-voltage duct. 4. The three-phase load special voltage. extending the common low voltage duct between the regulators, and connecting the low voltage side of each unit transformer of the transformer group;
4. The large-capacity three-phase transformer according to claim 3, wherein the three phases are connected together through the common low-voltage duct. 5 A plurality of transformer groups each consisting of a plurality of unit transformers arranged in a row are arranged in parallel, and the unit transformers of the transformer group are connected in parallel 1C1 and different transformers are connected via a low voltage duct. The unit transformers of the same phase in the group are electrically connected via high voltage ducts, and a phase separation bus is connected to the low voltage duct, and the unit transformers in the transformer group are connected electrically to each other via high voltage ducts. , a space corresponding to at least one unit transformer is provided, and the high voltage duct is located at the center of the unit transformers located at both ends of each transformer group, from the corresponding ends. A large-capacity three-phase unit transformer characterized in that the unit transformer is set up from the center of the unit transformer and placed above the unit transformer, and the phase separation bus bar is drawn out from between the high voltage ducts adjacent to the phases. transformer. 6. When the low voltage ducts are arranged above the unit transformers, the low voltage ducts are connected together by a common low voltage duct arranged between the transformer groups along the arrangement direction of the unit transformers, and , the phase separation busbar and the common low pressure duct)
6. The large-capacity three-phase transformer according to claim 5, wherein the high-capacity three-phase transformer is connected in an L/C connection and drawn out substantially parallel to the high-voltage duct. 1. The large-capacity three-phase transformer according to claim 6, wherein the common low-voltage duct is reinforced with stays that are fixed to opposing unit transformers of each transformer group. 8 A three-phase load special voltage regulator is connected to each of the transformer groups, and a space corresponding to one unit transformer is provided between adjacent three-phase load special voltage regulators, and the Each three-phase load special voltage regulator is electrically connected above the transformer group via a low-voltage duct arranged across the space, and each low-voltage duct is arranged above the space. The large-capacity three-phase system according to claim 6, wherein the high-capacity three-phase system is connected to a common low-voltage duct, and the low-voltage sides of each unit transformer of the transformer group are collectively connected to each of the three phases through the common low-voltage duct. transformer. 9. The common low-voltage duct is extended between the three-phase load special voltage regulators, and the low-voltage side of each unit transformer of the transformer group is connected from three phases to one another by the common duct. 9. The large-capacity three-phase transformer according to claim 8, wherein the common low-voltage duct is reinforced with a stay that is fixed to the opposing three-phase load special voltage regulator.