JPS5814735B2 - 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 are connected in a three-phase manner.

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 with the Sanwa transformer mentioned above, the unit transformer itself has become larger due to the increase in power generation capacity, causing transportation problems. The reality is that this is occurring.

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.

Particularly for split-type large-capacity three-phase transformers, it is economically advantageous to consider the installation space, but because multiple transformers are arranged side by side, an accident may occur. If this occurs, the device may need to be removed, so the installation space must take this into account.

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.

Unit transformers 1, 2, and 3 are arranged in one example to form a transformer group 50, and unit transformers 4, 5, and 6 are arranged in one example to form a transformer group 51.
The unit 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 pushers 9, 10, 11
, and 12, 13, and 14 to first and second low voltage circuits (not shown).

In addition, the high pressure side of each phase is connected to high pressure ducts N5 and 16.1, respectively.
7, the cable head 18 on the high voltage side,
19. It is connected to a high voltage cable (not shown) via 20.

Note that 21 and 22 are neutral point pushing.

The arrangement of the large-capacity Sanwa transformer connected in this manner is schematically 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. .

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

Still, each unit transformer 1, 2, and 3 of the transformer group 50 is connected to each unit transformer 4, 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 between the transformer groups 50 and 51, the adjacent in-phase unit transformers 1 and 4, 2 and 5, and 3 and 6 are High pressure duct 1
5, 16, and 17, and the 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, etc., there are various restrictions, such as generally having to use a single port for loading and unloading.

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,
The surrounding space is divided into 1,000 parts, for example, unit transformers 1, 2 .
Provide a space for removal on both the left side of unit transformer 3 and the right side of unit transformer 4, 5.6, and make it possible to remove only unit transformer 1 or 4 where an accident occurred, or remove the unit transformer in front. 3, 2, and 6 and 5 must be removed one after another, and in case of an accident, unit transformer 1 or 4 must be 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 developed in view of the above-mentioned points, and its purpose is to enable easy removal of the transformer without increasing the installation space even if the unit transformer needs to be replaced due to an accident or the like. The object of the present invention is to provide a large-capacity three-phase transformer that not only facilitates the installation and support of conservators, but also facilitates inspection and repair of each transformer group.

The present invention achieves the initial objective by providing a space equivalent to at least one unit transformer between unit transformers in a transformer group, and by arranging a plurality of conservators in a staggered manner on a high-voltage duct. It was created to do so.

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

4, 5, and 6 show an embodiment of the present invention.
It is a detailed diagram of a large-capacity Sanwa 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 manner 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 are arranged in parallel, a space A corresponding to at least one unit transformer is provided between each of the in-phase unit transformers 101 and 104, 102 and 105, and 103 and 106 of the transformer groups 5011 and 502. It is arranged as follows.

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.

Further, each transformer group 501 and 502 includes a three-phase load voltage regulator (hereinafter referred to as LVR) for voltage regulation.

) 107,108 in succession, these LVR 1 0 7
A space A' corresponding to one unit transformer is also provided between and 108, that is, with a distance l2 between the two such that the width of the unit transformer (=LVR width) 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.

In addition, normally, in such a transformer structure, the high and low voltage ducts that electrically connect each transformer body and the LVR connect the insulating oil circulating inside to the atmosphere via multiple conservators. In this embodiment, the plurality of conservators are arranged in a staggered manner across the high-pressure ducts to prevent the oil from absorbing moisture and to absorb the expansion and contraction of the oil due to temperature changes.

That is, each unit transformer 101 to 106 and high voltage duct 112
~Conservators 131, 132 for 114 and LVR1
07, 108 and the conservator 133 for the common low pressure duct 116 are arranged in a zigzag pattern.

The conservators 131 and 132 are the high pressure tact units 112 and 11.
In addition, the conservator 133 is arranged astride between the high pressure ducts 113 and 114, and each conservator 1
31, 132, and 133 are mounts 140 on the high pressure ducts.
, 141.

Unit transformers 101, 102, 103 of transformer group 501 are connected to conservator 131 via piping 150, and transformer group 5
02 unit transformers 104, 105, 106 are connected to piping 151
are respectively communicated with the conservator 132 via.

Further, each high pressure duct N12, 113, 114 is communicated with the conservator 132 via a common pipe 152.

Further, the I, VR 107, and 108 are connected to the conservator 133 through a pipe 153, and the common low pressure duct 116 is connected to the conservator 133 through a pipe 154, respectively.

Usually, although not shown, a protection relay such as a gas detection relay or an oil flow detection relay is provided in the middle of each pipe as necessary.

In addition, the conservators 131 to 133 are connected to the high pressure duct 112.
.about.114, the strength problem can be solved by reinforcing it with stays 125, as shown in FIG. 5, if necessary.

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 the 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
The common low pressure duct 116 extending into the space A' 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.

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

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, since there is space A, the unit transformer 101 or 104 where the accident occurred will be
By pulling out the 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 taking a lot of time. and unit transformer 1
Compared to the case where the space for carrying out the transformer is provided on both the right side of 04, 105, and 106, the space for carrying out the transformer is only half, and the overall installation space does not increase. When installing and supporting the betas, each conservator is arranged in a staggered manner, which makes it easy to install and support the work.

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, but this is not necessarily the case, and the number of unit transformers may be changed. is not limited.

Furthermore, in the above method, two transformer groups are installed at the same time, and their high voltage sides are connected in parallel, but when adding another transformer group to the existing transformer group, the high voltage side is connected in parallel. It can also be a line.

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.

Each conservator does not need to have a common integral structure, and may be partitioned and divided for each unit transformer.

In this case, each subdivided conservator is connected to a unit transformer.

According to the large-capacity horizontal-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 the unit transformers between the transformer groups are Since a space equivalent to at least one unit transformer is provided and multiple conservators are arranged in a staggered manner on the high-voltage duct, 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 group of transformers arranged in parallel, and it goes without saying that a special large installation space is not required. This has the advantage that there is more space between each conservator, the conservators can be easily installed and supported, and the transformer group can be inspected and repaired easily.

[Brief explanation of the drawing]

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, 1
01, 102, 103, 104, 105, 106・
・Unit transformer, 7, 8, 109, 110, 111, 1
15...Low pressure duct, 15, 16, 17, 112
, 113, 114...high pressure duct, 50, 51, 50
1,502...Transformer group, 107,108...Sanwa load voltage regulator, 116...Common low voltage duct, 11
7a, 117b...neutral point, 124,125...stay, 131,132,133...conservator, 1
50,151,152,153,154...Piping, 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 the unit transformers of the transformer group are connected in parallel via a low voltage tact, The unit transformers of the same phase of the different transformer groups are electrically connected via a high voltage duct, and each unit transformer is provided with a conservator connected to the inside of the high/low voltage duct. In the above, between the unit transformers between the transformer groups,
A large-capacity Sanwa transformer, characterized in that a space corresponding to at least one unit transformer is provided, and the conservators are arranged in a staggered manner on the high-voltage duct. 2. 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 the common low voltage duct. 2. The large-capacity Sanwa transformer according to claim 1, wherein the low voltage side of each unit transformer of said transformer group is connected together with a Sanwa transformer. 3. A three-phase on-load voltage regulator is connected to each of the transformer groups, and a space corresponding to one unit transformer is provided between the phase-adjacent Sanwa on-load voltage regulators, and the above-mentioned Each of the three-phase on-load voltage regulators is electrically connected above the transformer group via a low-voltage duct arranged across the space, and each of the low-voltage ducts is connected to the common transformer group arranged above the space. The large-capacity three-phase transformer according to claim 1, wherein the high-capacity three-phase transformer is connected to a low-voltage duct, and the low-voltage sides of each unit transformer of the transformer group are collectively connected to three phases through the common low-voltage duct. vessel. 4. A patent characterized in that the common low voltage duct is extended between the Sanwa on-load voltage regulators, 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. A large capacity Sanwa transformer according to claim 3. 5. The large-capacity Sanwa transformer according to claim 2 or 3, wherein the common low-voltage duct is reinforced with a stay that is fixed to the unit transformers facing each other in each transformer group. .