JPS5815928B2 - 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 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 heavy equipment capacity of the transformers connected to these generators also increases, it is usually divided into three generators for each phase. What constitutes a phase transformer is adopted.

However, transportation conditions have become increasingly severe in recent years as the location conditions for power plants and substations have deteriorated, and even if the three-phase transformer mentioned above is used, the single-phase transformer itself has become larger due to the increase in power generation capacity, making transportation difficult. The reality is that a problem has arisen.

For this reason, a so-called split-type transformer, in which a single-phase transformer is divided into multiple parts, is used to solve transportation problems.

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

However, as a result, due to issues such as civil engineering costs, there is a demand to minimize the installation space of the transformer.Especially when it comes to split-type large-capacity three-phase transformers, the installation space must be considered. Although it is economically advantageous to do so, since multiple transformers are arranged side by side, in the event of an accident, it may be necessary to remove the transformer. Installation space must be provided.

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, and 3 are arranged in one row to form a transformer group 50, and single-phase transformers 4, 5, and 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 bushings 9, 10, 11
It is also connected to first and second low voltage circuits (not shown) via 12, 13, and 14.

In addition, the high pressure side of each phase is connected to high pressure ducts N5, 16, and 1, respectively.
7, and the high voltage side cable head 18,1
It is connected to a high voltage cable (not shown) via terminals 9 and 20.

Reference numerals 21 and 22 are neutral point bushings.

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

The degree transformers 1, 2.3 are arranged in one row to form one transformer group 50, and the other degree 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 degree transformer 1, 2, and 3 of the transformer group 50 is connected to each degree transformer 4, 5 of the transformer group 51 via a low voltage duct 7.
．． and 6 are electrically connected to each other via a low-voltage duct 8, and the adjacent in-phase unit transformers 1 and 4, 2 and 5, and 3 and 6 are connected to each other through a high-voltage duct 15° between the transformer groups 50 and 51. 16 and 17, respectively, and a cable head 20 (only one phase is shown in FIG. 3, but each phase is identical).

connected to the power grid via.

By the way, when installing a transformer bank configured in this way, especially in a basement where space is limited, as mentioned above, the installation must be such that the transformer can be easily replaced in case of an accident. In addition, in the case of a basement or the like, there are various restrictions such as the fact that the loading/unloading exit is generally used in one place.

In other words, in the conventional layout example described above, for example, if the loading and unloading exits are on the side of transformers 3 and 6, in the unlikely event that a transformer accident occurs, the unit transformer 1, which is the farthest unit when viewed from the loading and unloading exits, will be damaged. or 4
If this occurs and these need to be replaced,
Provide enough space around the transformer, for example L 2,
Provide a space for removal on both the left side of 3 and the right side of 4, 5, and 6 transformers so that only 1° or 4 transformer in which an accident occurred can be removed, or remove the 1° or 4 transformer in front. A system must be adopted in which transformers 3, 2 or 6, 5 are removed one after another, and unit transformers 1 and 4 in case of an accident are removed.

In any case, if you consider replacing the transformer in the event of an accident, the installation space will increase, and even if the installation space does not increase, it will take a lot of time to replace the transformer. This resulted in the drawback of being too lenient and making it difficult to take countermeasures.

The present invention has been made in view of the above points, and its purpose is to easily transport the transformer without increasing the installation space even if it becomes necessary to replace the transformer due to an accident or the like. The object of the present invention is to provide a large-capacity three-phase transformer in which high and low voltage ducts for each transformer group can be easily manufactured.

In the present invention, a plurality of transformer groups each consisting of a plurality of unit transformers arranged in one row are arranged in parallel, and a space corresponding to at least one unit transformer is provided between the unit transformers between the transformer groups. and high and low voltage ducts electrically connecting between the transformers of the transformer group are arranged above the transformers so as to straddle the space, and furthermore, the spaces connecting the low voltage ducts are arranged above the transformers. A common low voltage duct located above connects the low voltage sides of each transformer of the transformer group in 7 three-phase blocks, and the high and low voltage ducts are provided at symmetrical positions with respect to the common low voltage duct. This was done to achieve the initial purpose.

Hereinafter, the present invention will be described in detail based on embodiments of the drawings.

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

In the figure, transformer group 501 is transformer 101.1.
02 and 103 are arranged in one row, and the other transformer group 502 is formed in the same manner with the transformers 104, 105, 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, the transformers 101 and 104, 102 and 105, and 1 of the same phase of the transformer groups 501 and 502,
．． A space A corresponding to at least one transformer is provided between 03 and 106.

That is, as shown in FIG. 4, the transformers between different transformer groups are arranged so that the width 12 of the space A is 11 times 12 with respect to the width 11 of the unit transformer.

Further, low voltage ducts 109, 110 and 111 electrically connect the low voltage sides of each prefectural transformer 101 and 104, 102 and 105, and 103 and 106, and high voltage ducts 112, 113 electrically connect the high voltage sides of each prefecture transformer. and 114 are extended above each degree transformer and are installed so as to straddle the space A.

Further, each transformer group 501° and 502 has a palmistry load dark voltage regulator (hereinafter referred to as LVR) for voltage regulation.

) 107, 108, and these LVRs 107 and 10
8, there is also a space A' corresponding to one unit transformer, that is, the distance 12 between them is the unit transformer width (=LVR width) 11
The device is installed with an interval of 11≦12.

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

Each degree 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 low voltage sides of each of the transformers 101 to 106 of the transformer groups 501 and 502 are connected together in three phases by the common low voltage duct 116. are doing.

The tip of the 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, high pressure ducts 112, 113, 114
And the low pressure ducts 109, 110, 111 are arranged symmetrically with respect to the common low pressure duct 116.

With this configuration of this embodiment, in the event that an accident or the like occurs and it becomes necessary to replace the transverse transformer, for example, if the loading and unloading ports are connected to the transformers 103 and 10.
Even if the transformer accident occurred at the farthest transformer 101 and 104 when viewed from the loading/unloading exit, there is space A, so the transformer 101 where the accident occurred is ,
Or, by pulling out the space A of 104, it becomes possible to carry it out regardless of other degree transformers, and it is easy to replace it without requiring a lot of time. transformer 10
4, 105 and 106, the space for carrying out the transformers is only half required, and the overall installation space does not increase. Duct 112, 113,
114 and each low pressure duct No. 9, 110, and 111 are arranged symmetrically with respect to the common low pressure duct 116, so the high pressure duct and low pressure duct of each phase can be of the same shape, so they can be manufactured in the same way. It has the advantage of being easy to manufacture as it can be done all at once.

In the above-mentioned 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, and the number of unit transformers There are no limitations on this.

Furthermore, in the case of the above-mentioned method, two cryopressurizer groups are installed at the same time. Although the high voltage side is connected in parallel, if another transformer group is added to the existing transformer group, the bulk voltage side may be connected in series.

Further, although this embodiment has been described with reference to an example in which the device is buried underground, it goes without saying that the same applies even if it is installed above ground.

According to the unexploded large-capacity three-phase transformer described above, a plurality of transformer groups each consisting of a plurality of 9-degree transformers arranged in a row are arranged in parallel, and the distance between the degree transformers between these transformer groups is , providing a space corresponding to at least one of the transformers, and electrically connecting the transformers of the transformer group;
A low voltage duct is arranged above the transformer so as to straddle the space, and a common low voltage duct arranged above the space connecting each low voltage duct connects the low voltage side of each transformer of the transformer group. The three phases are connected together, and the high and low voltage ducts are located symmetrically to the common low voltage duct, so even if an accident occurs and the unit transformer needs to be replaced, By using this space, it is possible to easily remove and replace both transformers in a transformer group arranged in parallel, and it goes without saying that a particularly large installation space is required. Since the low-pressure ducts may have the same shape, they can be manufactured all at once, and the ducts can be manufactured easily.

[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. 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, 15.16,1
7,112,113,114...High pressure duct, 50,51
, 501, 502...Transformer group. 107.108...Sanwa load voltage regulator, 116...Common low pressure duct, 117a, 117b...Neutral point, 124...Stay, A, A'...Space.

Claims (1)

[Claims] 1. A plurality of transformer groups each having a plurality of transformers arranged in a row are arranged in parallel, and the transformers of the transformer group are connected in parallel via a low voltage duct. , in which the unit transformers of the same phase of the different transformer groups are electrically connected via high-voltage ducts, there is at least the plasma level between the unit transformers of the transformer groups. A space corresponding to one transformer is provided, and the low voltage ducts are arranged above the transformer so as to straddle the space, and each of the low voltage ducts connects to a common low voltage duct arranged above the space. the common low voltage duct connects the low voltage sides of each transformer of the transformer group at once, and the low voltage duct is located symmetrically with respect to the common low voltage duct. A large-capacity three-phase transformer characterized by the fact that it is installed in 2. 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, Claim 1, wherein each of the three-phase load special voltage regulators is electrically connected to the transformer group via a low-voltage duct arranged across the space. Large capacity three-phase transformer. 3. The common low-voltage duct is extended between the three-phase load special voltage regulators, and the low-voltage side of each serotic transformer of the transformer group is connected to the three phases at once by the common low-voltage duct. A large-capacity three-phase transformer according to claim 2.