JPS5814734B2 - 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 power generation capacity, multiple generators may be installed, but since the single unit capacity of the transformer connected to these generators also increases, it is usually divided into three generators for each phase. What constitutes a phase transformer is adopted.

However, in recent years, as the location conditions for power plants and substations have deteriorated, transportation conditions have become increasingly severe, and even with the three-phase transformers mentioned above, the common-phase transformers themselves have become larger due to the increase in power generation capacity, making transportation difficult. The reality is that this problem is occurring.

For this reason, one single-phase transformer is divided into multiple parts.

A so-called split type transformer is used to solve transportation problems.

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.

Particularly in the case of split-type large-capacity three-position transformers, it is economically advantageous to consider the installation space, but due to the convenience of arranging multiple transformers side by side, accidents may occur. If this occurs, the transformer may have to be removed, so the installation space must take this into consideration.

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

This figure is an example in which two low voltage circuits and one high voltage circuit are interconnected.

Single-phase transformers 1, 2.3 are arranged in one row to form a transformer group 50, and single-phase transformers 4, 5.6 are arranged in one row to form a transformer group 51.
The single-phase transformers 1, 2, 3 and 4, 5, 6 connect their low-voltage sides to three-phase triangular connections (U
, v, w phase Δ connection), and low-pressure switching 9, 10, 11
, and 12, 13, and 14 to first and second low voltage circuits (not shown).

Further, the high pressure side of each phase is connected to high pressure ducts 15, 16, .
17 and connected in parallel within the cable head 18 on the high voltage side.
, 19, 20 to a high voltage cable (not shown).

Note that 21 and 22 are neutral points.

The arrangement of the large-capacity three-phase transformer connected in this manner is schematically shown in FIGS. 2 and 3.

Unit transformers 1, 2.3 are arranged in one row to form one transformer group 50, and other unit transformers 4, 5.6 similarly form one transformer group 51. .

The transformer groups 50 and 51 are arranged in parallel to form a transformer bank.

Further, each unit transformer 1, 2, and 3 of the transformer group 50 is connected to each unit transformer 4, 3 of the transformer group 51 via a low voltage duct 7.
5 and 6 are electrically connected to each other via a low voltage duct 8, and adjacent unit transformers 1 and 4, 2 and 5, and 3 and 6 of the same phase between the transformer groups 50 and 51 are high voltage Duct 1
5, 16 and 17, and a cable head 20 (only one phase is shown in FIG. 3, but each phase is the same).

) to the power grid.

Further, from each low voltage duct 7, 8, each transformer group 50, 51
Phase separation bus bars 21 and 22 are drawn out as shown in FIG.

However, although the phase separation buses 21 and 22 mentioned above are drawn out in the direction in which the unit transformers of the transformer group are arranged, that is, in the downward direction in the drawing, these portions are normally provided when three-phase loads are used to adjust the voltage. Voltage regulator (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.

Another object of the present invention is to make it easy to draw out the phase separation busbar, and even if it becomes necessary to replace the unit transformer due to an accident or the like, it is possible to easily replace the transformer without increasing the installation space. The point is that it is possible to carry out the removal of

The high and low voltage ducts of the present invention are arranged above the unit transformer,
The first purpose is achieved by connecting the low pressure ducts to a common low pressure duct, connecting the phase separation bus of each group to the common low pressure duct, and drawing out the phase separation bus of each group almost parallel to the high pressure duct. In addition to the above-mentioned points, the second object is achieved by providing a space between the unit transformers in the transformer group, which is equivalent to at least one unit transformer. be.

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

FIG. 4, FIG. 5, and FIG. 6 show an embodiment of the large-capacity three-phase transformer of the present invention.

In the figure, a transformer group 501 includes unit transformers 101,1
02 and 103 are arranged in one row, and the other transformer group 502 is formed in the same manner with each unit transformer 104, 105, and 106.

The transformer groups 501 and 502 are arranged in parallel to form a transformer bank. When the transformer groups 501 and 502 are arranged in parallel, each unit transformer 101, 104, 102 of the transformer groups 501 and 502 has the same phase. and 105, and 103 and 106
A space A corresponding to at least one unit transformer is provided between
It is located with a

That is, as shown in Fig. 4, between the unit transformers between different transformer groups, the width of the space A is defined as l1≦with respect to the unit transformer width t1.
12.

Further, low voltage ducts 109, 110, 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 112, 113 electrically connect each high voltage side. , and 114 extend 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 t2 between the two is the unit transformer width (=LVR width)
They are installed with an interval of l1 and l1≦l2.

The LVRs 107 and 108 are also connected by a low voltage duct 115 that electrically connects the low voltage side of each unit transformer placed 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 each unit transformer 101 to 106 of the transformer groups 501 and 502 is connected to the common low voltage duct 116.
The low pressure side of each of the three phases is connected together.

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.

Furthermore, in this embodiment, the common low voltage duct 116 has phase separation busbars (u1, v1, w1) for each phase of each transformer group 501, 502.
Connect phase 125, u2, v2, w3 phase 126),
It is drawn out to the left side as shown in FIG. 4, almost parallel to the high pressure ducts 112, 113, and 114.

In addition, in this embodiment, the common low voltage duct 116 is connected to the unit transformers 101 to 1 of the transformer groups 501 and 502 facing each other.
It is reinforced with an integrated gate-shaped stay with one end fixed to 06.

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

Figure 5 shows this example, LVR1 07 and 108
The integral portal stay 124 with one end fixed to the LVR
A common low pressure duct 116 extending into the space A' between I 0 7 and 108 is reinforced.

By doing this, the common low pressure duct 116 is firmly supported, and each low pressure duct 1
09, 110, and 111 are also firmly supported, resulting in an overall sturdy 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.

121, 122, and 123 are high voltage cable heads for each phase.

With this configuration, there is no obstacle to drawing out the phase separation bus bar unlike in the case of LVR, and there is no need to make any ingenuity in drawing out the phase separation bus bar, and the phase separation bus bar can be easily drawn out in one direction. You can make withdrawals.

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 unlikely event that an accident occurs and a unit transformer needs to be replaced, assuming that the loading and unloading exits are on the unit transformer 103 and 106 sides, the
The unit transformer 101 or 10 located at the farthest end when viewed from the exit
Even if an accident occurs in 4, there is space A, so by pulling out the space A of unit transformer 101 or 104 where the accident occurred, it becomes possible to remove it regardless of other unit transformers, and it is possible to replace it. This can be done easily without requiring a lot of time, and compared to a method that provides space for carrying out the transformers on both the left side of the unit transformers 101, 102, and 103 and the right side of the unit transformers 104, 105, and 106. ,
The space for carrying it out can be halved, which has the effect that the overall installation space does not increase.

In addition, in the above-mentioned embodiment, a space is provided between the unit transformers in each transformer group, a phase separation bus is connected to the common low voltage duct, and the phase separation bus is drawn out almost parallel to the high voltage duct. As mentioned above, no particular space is required to achieve the effect of easily drawing out the phase separation generatrix, and the purpose can be achieved by drawing out the generatrix as described above regardless of the space. be.

Further, in the above embodiment, two transformer groups in which three unit transformers are arranged in one row are connected in parallel, and there are six unit transformers in total. However, the present invention is not limited to this. The number of units is not limited.

In addition, the two Monoke transformer groups mentioned above are installed 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.

Although this embodiment has been described with reference to an example in which the device is buried in a basement or the like, it goes without saying that the same applies even if it is placed above ground.

The large-capacity three-phase transformer of the present invention described above has
The low voltage duct is placed above the unit transformer, each low voltage duct is connected to a common low voltage duct, each phase separation bus is connected to the common low voltage duct, and these are drawn out almost parallel to the high voltage duct. Because of this, there is no obstacle to pulling out the bus bar, and the drawer can be easily pulled out without any ingenuity.

Furthermore, in addition to the above-mentioned points, a plurality of transformer groups each consisting of a plurality of unit transformers arranged in a row are arranged in parallel, and the distance between the unit transformers between these transformer groups is at least one unit transformer. Since a corresponding space is provided, even if a unit transformer needs to be replaced due to an accident, this space can be used to replace both unit transformers in a group of transformers arranged in parallel. It is very effective when used in this type of transformer because it can be easily removed and replaced and does not require a special large installation space.

[Brief explanation of the drawing]

Figure 4 is a diagram showing a general 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. Figure 5 is its front view;
FIG. 6 is a side view thereof. 1, 2, 3, 4, 5, 6, 101, 102, 103, 1
04,105,106...Unit transformer, 7,8
, 109, 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 voltage duct,
117a, 117b...neutral point, 124...
...Stay, 21, 22, 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 one row are arranged in parallel, and the unit transformers of the transformer group are connected in parallel via a low voltage duct, and in which the unit transformers of the same phase of the different transformer groups are electrically connected via high voltage ducts, the high and low voltage ducts are arranged above the unit transformers, and each of the low voltage ducts are each connected to a common low voltage duct, and the phase separation bus of each transformer group is connected to the common low voltage duct, and the phase separation bus of each group is drawn out substantially parallel to the high voltage duct. Large capacity three-phase transformer. 2. The large-capacity three-phase transformer according to claim 1, wherein the low-voltage side of each unit transformer of the transformer group is collectively connected to three phases through the common low-voltage duct. 3. A three-phase on-load voltage regulator is connected to each of the transformer groups, and each three-phase on-load voltage regulator is electrically connected to the transformer group via the low-voltage duct. A large-capacity three-phase transformer according to claim 1. 4. A patent characterized in that the common low-voltage duct is extended between the three-phase on-load voltage regulators, and the low-voltage side of each unit transformer of the transformer group is collectively connected to the three phases by the common low-voltage duct. A large capacity three-phase transformer according to claim 3. 5 A plurality of transformer groups each consisting of a plurality of unit transformers arranged in one row are arranged in parallel, and the unit transformers of the transformer group are connected in parallel via a low voltage duct, and different transformers are connected in parallel. The unit transformers of the same phase in the transformer group are electrically connected via high-voltage ducts. A corresponding space is provided, and the high and low voltage ducts are arranged above the unit transformer so as to straddle the space, and each of the low voltage ducts is connected to a common low voltage duct arranged above the space, and the common low voltage duct is connected to a common low voltage duct arranged above the space. A large-capacity Sanwa transformer, characterized in that a phase separation bus of each transformer group is connected to the duct, and the phase separation bus of each group is drawn out substantially parallel to a high voltage duct. 6. The large-capacity three-phase transformer according to claim 5, wherein the low-voltage side of each unit transformer of the transformer group is collectively connected to three phases through the common low-voltage duct. 7. The large-capacity three-phase transformer according to claim 5 or 6, characterized in that the common low voltage duct is reinforced with stays that are fixed to opposing unit transformers of each transformer group. vessel. 8 A three-phase on-load voltage regulator is connected to each of the transformer groups, and a three-phase on-load voltage regulator is connected to the adjacent three-phase on-load voltage regulator,
A space corresponding to one unit transformer is provided, and each of the three-phase on-load voltage regulators is electrically connected to the transformer group above the space through a low-voltage duct arranged so as to straddle the space. and each of the low voltage ducts is connected to a common low voltage duct disposed above the space, and the low voltage side of each unit transformer of the transformer group is connected at once to three phases by the common low voltage duct. A large-capacity three-phase transformer according to claim 5. 9. The common low voltage duct is extended between the three-phase on-load voltage regulators, and the low voltage side of each unit transformer of the transformer group is connected to the three phases at once by the common duct, and the common low voltage duct is connected to the common low voltage duct. 9. The large-capacity three-phase transformer according to claim 8, wherein the large-capacity three-phase transformer is reinforced with a stay fixed to the opposing three-phase load voltage regulator.