JPS5814736B2 - Large capacity three phase transformer - Google Patents

Description

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

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 Japanese 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 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.

In particular, split-type large-capacity Sanwa transformers are economically advantageous by considering their installation space, but because multiple transformers are arranged side by side, an accident may occur. In this case, the transformer may have to be removed, so the installation space must take this into account.

Figure 1 shows an example of the wiring of a general large-capacity Sanwa 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.

Unit transformer 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, and single-phase transformers 1, 2,
The low pressure sides of paths 3, 4, 5, and 6 are connected in a ball phase triangular connection (13, V, W phase Δ connection) in low pressure ducts 7 and 8, and low pressure pushing 9, 10, 11, and 12, 13, It is connected to first and second low voltage circuits (not shown) via 14.

In addition, the high pressure side of each phase is connected to a high pressure duct 15, is,
17, the high voltage side cable head 8,
It is connected to a high voltage cable (not shown) via terminals 19 and 20.

Note that points 21 and 22 are neutral point bushings.

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

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

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 and unloading exits are generally used in one place.

In other words, in the conventional arrangement example described above, for example, if the loading and unloading exits are on the unit transformer 3 and 6 sides, in the unlikely event that a transformer accident occurs, the unit transformer 1, which is the farthest from the loading and unloading exits, or 4
If this occurs and these need to be replaced,
Make enough space around unit transformers 1, 2,
Provide a space for carrying out both the left side of unit transformer 3 and the right side of unit transformers 4 and 5.6, and make it possible to carry out only the unit transformer 1 and 4 where the accident occurred, or remove the unit in front A method must be adopted in which transformers 3 and 2 or 6 and 5 are removed one after another, and unit transformers 1 and 4 due to an accident are removed.

In any case, when considering 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. There was a drawback that it became difficult to take countermeasures.

The present invention has been made in view of the above-mentioned points, and its purpose is to easily transport the transformer without increasing the installation space even if it becomes necessary to replace the unit transformer due to an accident or the like. The object of the present invention is to provide a large-capacity Sanwa transformer in which the configuration of the Sanwa on-load voltage regulator connected to each transformer group is simplified.

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 a three-phase on-load voltage regulator is connected to each transformer group with a similar space, and high and low voltage ducts are arranged above the unit transformer so as to straddle the space, and Each three-phase on-load voltage regulator is electrically connected to the transformer group via a low voltage duct placed across the space, and each of the low voltage ducts is connected to a common low voltage duct placed above the space. At the same time, the common low voltage duct connects the low voltage sides of each unit transformer of the transformer group at once in three phases, and the common low voltage duct is extended between the Sanwa load voltage regulators, and the common low voltage The initial objective is achieved by providing neutral point terminals for each of the transformer groups in the extended portion of the duct.

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

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

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 way with each unit transformer 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, each unit transformer 101 and 104, 102 and 105, 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, between the unit transformers between different transformer groups, the width l2 of the space A is set to l1 with respect to the unit transformer width l1.
They are arranged so that ≦l2.

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 a high voltage duct 112, which electrically connects each high voltage side. 113 and 114 are extended above each unit transformer and are installed so as to straddle the space A.

Furthermore, each of the transformer groups 501 and 502 includes a Sanwa load voltage regulator (hereinafter referred to as LVR) for voltage regulation.

) 107,108 and these LVR 1 0 7
and 108 also have a space X equivalent to one unit transformer,
In other words, the distance l2 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 A' between them.

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 disposed 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.

In this embodiment, the neutral point terminal 1 of the transformer groups 501 and 502 is provided at the tip of the extended portion of the common low voltage duct 116.
17a and 117b are provided.

Furthermore, in this embodiment, the common low voltage duct 116 is connected to the opposing unit transformers 101 to 10 of each transformer group 501 and 502.
It is reinforced with an integrated gate-shaped stay that has one end fixed to 6.

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

Figure 5 shows this example, where LVR 1 0 7 and 1
An integral portal stay 124 whose one end is fixed to L
A common low pressure duct 116 extending into the space N between VR 107 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.

By adopting the configuration of this embodiment as described above, if an accident or the like occurs and it becomes necessary to replace the unit transformer, for example, if the loading/unloading exit is connected to the unit transformer 103, 10.
Even if a transformer accident occurs at the unit transformer 101 or 104 located at the farthest end when viewed from the loading/unloading exit, there is space A, so the unit transformer 101 or 104 where the accident occurred is
Alternatively, by pulling out the unit transformer 104 from the space A, it becomes possible to carry it out regardless of other unit transformers, and it is easy to replace it without requiring a lot of time. unit transformer 1
Compared to the case where space for carrying out the transformer is provided on both the right sides of 04, 105, and 106, the space for carrying out the transformer is only half, and the overall installation space does not increase. Each transformer group 501
, 502 were provided on the LVRs 107, 108, but in the present invention, the extended portion of the common low voltage duct 116 can be used and the neutral point terminals 117a, 117b can be provided in that portion. The structure of the LVR 107, 108 is simplified, and there is an effect that the complexity of removing the neutral point terminal (butting) from the LVR 107, 108 especially during installation and assembly or maintenance/inspection is eliminated.

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, and the number of unit transformers There are no limitations on this.

Furthermore, in the above system, two transformer groups are installed at the same time, and the high voltage sides are connected in parallel, but when adding another transformer group to the existing transformer group, the high voltage sides are connected in series. But that's fine.

Further, 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 the device is buried above ground.

According to the large-capacity three-phase transformer of the present invention described above, a plurality of transformer groups each consisting of a plurality of unit transformers arranged in a row are arranged in parallel, and between the unit transformers between these transformer groups, A space equivalent to at least one unit transformer is provided, and each transformer group is connected to a Sanwa load voltage regulator with the same space, and the high and low voltage ducts are installed in a space above the unit transformer. and each of the three-phase on-load voltage regulators is electrically connected to the transformer group via a low-voltage duct arranged so as to straddle the space, and each of the low-voltage ducts is arranged above the space. A common low voltage duct is connected to a common low voltage duct, and the low voltage side of each unit transformer of the transformer group is connected together in three phases by the common low voltage duct, and a common low voltage duct is connected between the three phase on-load voltage regulators. is extended, and the neutral point terminal of each transformer group is provided in the extended part.
Even if a unit transformer needs to be replaced due to an accident, by using this space, both unit transformers in a group of transformers arranged in parallel can be easily removed and replaced. Therefore, not only does it not require a particularly large installation space, but it also eliminates the need to provide a neutral point terminal for each transformer group in the three-phase load voltage regulator, and the configuration of the Sanwa load voltage regulator is improved. It has the effect of simplifying.

[Brief explanation of the drawings] Figure 1 is a diagram showing a general wiring example of a large-capacity Sanwa transformer.
FIG. 2 is a plan view showing the arrangement of a conventional large-capacity Sanwa transformer, FIG. 3 is a front view thereof, and FIG. 4 is a plan view of a large-capacity Sanwa 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, 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, 1 1 6...
・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 unit transformers arranged in a row are installed 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, at least A space corresponding to one unit transformer is provided, and a three-phase load voltage regulator is connected to each transformer group with the same space, and the high and low voltage ducts are connected above the unit transformer. The three-phase on-load voltage regulators are arranged so as to straddle the space, and each of the three-phase on-load voltage regulators is electrically connected to the transformer group via a low-voltage duct that is arranged so as to straddle the space, and each of the low-voltage ducts is arranged so as to straddle the space. It is connected to a common low voltage duct located above, and the low voltage side of each unit transformer of the transformer group is collectively connected to the Sanwa by the common low voltage duct, and between the Sanwa load voltage regulators. A large-capacity three-phase transformer, characterized in that the common low-voltage duct is extended, and neutral point terminals for each of the transformer groups are provided in the extended portion of the common low-voltage duct. 2. Claim 1, characterized in that the common low voltage duct is reinforced with stays that are fixed to the opposing unit transformers of each transformer group and the opposing Sanwa on-load voltage regulators. Large capacity Sanwa transformer listed.