JPS6041211A - Transformer - Google Patents

Abstract

PURPOSE:To easily change over a single phase transformer to a spare transformer if trouble occurs in such single phase transformer by providing a signle phase transformer as a spare adjacently to a three-phase thransformer consisting of three units of single phase transformer. CONSTITUTION:Three units of single phase tranformers A, B, C forming a split type 3-phase transformer are composed of the 500kV system and ultra-high voltage transmission system through an interface. Moreover, a unit of spare single phase transformer 13 having the equivalent capability as that of these transformers is also provided in parallel. The transformer 13 is connected by the conduit buses 12, 9 both in the primary and secondary sides and can be connected to any phase of the conduit buses 4, 2 connected to the primary and secondary terminals of other three units of transformers. In the areas where the conduit buses 12, 9 sent from the transformer 13 and the conduit buses 4, 2 sent from the 3-phase transformer are located closely, the respective conduit buses 8, 7 have the structure wherein the external tank and internal conductor can be removed easily at the adequate range.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention particularly relates to an arrangement method and system for arranging a spare single-phase transformer in a split-type three-phase transformer connected to an ultra-super high voltage power transmission system. Regarding the connection method.

[Technical background of the invention and its problems] With the increase in electricity demand in recent years, 500KV power transmission has been realized, and even 100OKV class ultra-super high voltage power transmission (hereinafter referred to as U
(referred to as HV power transmission) research is also progressing. The transformers installed in these 500 KV or UHV power transmission substations have a three-phase transformer configuration in which a plurality of unit transformers are arranged in parallel.

The divided transformer, which divides a three-phase transformer into individual phases, is an excellent method for increasing the capacity of a transformer by dealing with dimensional restrictions when transporting the transformer. Figure 1 shows three single-phase transformers A, B, and C arranged in parallel to generate a voltage of 50°KV at UH.
This shows the configuration of a three-phase transformer that boosts the voltage of the V system. One single-phase transformer 1 is on the left primary side (500KV side)
, the right secondary side (Ul-1V side) are connected through a gas-oil bushing 6.3, gas insulated pipe busbars 4, 2, and a switch 6. Such UHV-class transformers will have a capacity two to three times larger (2000 to 3000 MVA) than the current largest transformers in Japan, and will be the keystone of future power transmission systems. Therefore, the constructing transformer is
Sufficient reliability will be required. However, in the unlikely event that
If a problem were to occur with one of these transformers, the impact on the system would be large because of the large capacity of the transformer, and there is a possibility that it would cause serious damage.

Therefore, it goes without saying that these transformers must be supplied with highly reliable equipment that will not cause accidents, but even if an accident occurs in the transformer, it is important to ensure that recovery after the accident is quick. Consideration must be given to measures that can be taken to

[Purpose of the invention]

The present invention has been made in view of the above points, and when an accident occurs in one single-phase transformer in a split-type three-phase transformer, this transformer is removed from the system and placed adjacent to it. The object of the present invention is to provide a transformer that can be easily switched and connected to a spare transformer.

[Summary of the invention]

In order to achieve the above object, the present invention further arranges one spare single-phase transformer adjacent to a three-phase transformer consisting of three single-phase transformers, and one of the spare single-phase transformers. Next, the conduit busbar is connected to the secondary side terminal in advance, and the configuration is such that it can be easily switched and connected to the conduit busbars connected to the primary and secondary sides of the other three single-phase transformers, respectively. In the event that an accident occurs within one single-phase transformer, disconnect the single-phase transformer and
If an accident occurs in a spare single-phase transformer, the single-phase transformer can be replaced by disconnecting the single-phase transformer and simply changing the connection between the spare single-phase transformer and the conduit busbar. be.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram of a split three-phase transformer according to the present invention, in which one spare single-phase transformer 13 is arranged adjacently. In Figure 2, three single-phase transformers A, B, and C that make up a split three-phase transformer have a voltage of 500 KV.
In order to interconnect the grid and the UHV grid, one standby single-phase transformer 13 is arranged in the same manner as shown in Fig. 1 and has the same capacity as each of the three single-phase transformers A, B, and C. are descended and juxtaposed. Here, the primary side and secondary side terminals of this spare single-phase transformer are connected by conduit buses 12 and 9, and the other three
It is configured so that it can be connected to any phase of the conduit busbar 4.2 connected to the primary and secondary terminals of the single-phase transformer. At locations where the conduit busbars 12, 9 from the standby single-phase transformer and the conduit busbars 4.2 from the three-phase transformer are close to each other, each conduit busbar is located within an appropriate range, Both the outer tank and the inner conductor are conduit busbars 8, 7 having a structure that can be easily removed. Normally, these two pipe busbars are not connected to each other, but are separated from each other by their vertical positional relationship (difference in height at which they intersect).

Figure 3 is a sectional view of A''-'''A'' in Figure 2, showing the usual positions of the pipeline busbars 4 and 2 on the three-phase transformer side and the pipeline busbars 11 and 8 on the standby single-phase transformer side. This shows the relationship.Each pipe bus line is separated by a certain distance and intersects at an angle of approximately 90 degrees in a vertical positional relationship.

FIG. 4 is a diagram showing the connection change between the single-phase transformer that caused the accident and the spare single-phase transformer. For the single-phase transformer that caused the accident, some of the pipe busbars (pipe busbar 10.7 in Figure 3) were removed between the transformer and the switch on both the primary and secondary sides and a spare single-phase transformer was installed. A dedicated conduit busbar 15°14 was installed to connect to the conduit busbar 12.9 on the side of the transformer, and the connection was changed to a spare single-phase transformer.

FIG. 5 shows a view taken along arrow B in FIG. Here, the conductor arranged inside the tank in the dedicated conduit busbar 15.14 for connecting with the standby single-phase transformer shown in FIGS. 4 and 5 has a structure that allows easy sliding. The ends of the conductors shall be structured so that they can be easily connected to other conductors. In other words, the conductor constitutes a slide contact.

FIG. 6 shows another embodiment of the present invention, which is a modification of the configuration shown in FIG. In Figure 6, the spare single-phase transformer is installed in the center of two banks of three-phase transformers, and can be easily connected to any of the other six single-phase transformers. The transformer can also be used as a standby single-phase transformer with two punctures.

Although the primary and secondary sides are pulled out in opposite directions in both FIGS. 2 and 6, it goes without saying that the present invention can be practiced even when both sides are pulled out in the same direction.

〔Effect of the invention〕

In the transformer of the present invention configured in this way, the following various effects can be obtained.

(1) The transformer used in the UHV system has a large capacity, and in the event of an accident, the impact on others would be extremely large. Therefore, as in the present invention, a spare single-phase transformer is placed adjacent to a split three-phase transformer, and each single-phase transformer and the spare single-phase transformer can be easily connected. If the conduit busbar from the standby single-phase transformer is connected in advance and placed so that it intersects with the conduit busbars of any phase of the three-phase transformer, it will be possible to prevent the disconnection of the single-phase transformer and the standby standby line in the event of an accident. It is possible to quickly make a connection with a phase transformer. The fact that this connection change can be carried out quickly means that the accident will not have a long-term impact on the grid.
Grid operation 1 is excellent.

(2) As in the present invention, the conduit busbar from the standby single-phase transformer and the three-phase transformer have a structure in which the conduit busbar can be removed over an appropriate length near where they intersect. This means that when connecting the two, it is possible to easily connect them using a dedicated connection pipe busbar, and the structure is highly reliable in terms of insulation before and after the connection.

(3) In the structure of the present invention, no matter which phase of the single-phase transformer is replaced with a spare single-phase transformer, the dedicated conduit busbar for connection is common and always connected to the primary side.

It is sufficient to provide only one set of dedicated conduit bus bars on the secondary side.

(4) In the structure of the present invention, the conduit busbar of the standby single-phase transformer and the
At the portion where the phase transformer intersects with the pipeline busbar, they are normally constructed independently from each other with an appropriate distance apart. Although it is possible to install a dedicated switchgear mechanism at the intersection of these two pipe busbars, in the case of the present invention, it is cheaper than installing a complicated switchgear mechanism, and it also prevents incorrect opening/closing operations due to operational errors. There is no need to perform this process, and the insulation reliability is excellent at all times.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional three-phase split type transformer, Fig. 2 is a block diagram of a three-phase split type transformer according to the present invention, and Figs. 3, 4, and 5 show one unit. FIG. 6 is a block diagram showing another embodiment of the present invention. 1... Single-phase transformer 2, 4... Three-phase transformer conduit busbar 6... Switchgear 7.8, 10.11... Removable conduit busbar 9.1
2... Pipe busbar 13 of standby single-phase transformer... Standby single-phase transformer (7317) Agent Patent attorney Noriyuki Chika (1 person) π1 Lead 1 (1 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) Three single-phase transformers are combined to form a split three-phase transformer, and a spare single-phase transformer having the same capacity as the single-phase transformer is installed adjacently, and three In a system in which a phase transformer and other substation equipment are connected by an insulated conduit busbar, an insulated conduit busbar is connected to the primary and secondary sides of the spare single-phase transformer, and this insulated conduit busbar is connected to the primary and secondary sides of the spare single-phase transformer. The primary and secondary insulated conduit busbars of each phase of the three-phase transformer are arranged so that they intersect closely vertically in a vertical positional relationship, and the conduit busbars of each phase of the three-phase transformer are arranged so that they closely intersect with each other in a vertical positional relationship. The tank and busbar of the insulated conduit busbar are both removable, and after the insulated conduit busbars are removed from each other, the spare single-phase transformer can be connected to other substation equipment of any phase using the dedicated connection insulated conduit busbar. A transformer that is characterized by the ability to (2. In claim 1, the spare single-phase transformer is arranged approximately in the center of the split three-phase transformer with two punctures, and the insulated conduit busbar connected to the spare single-phase transformer is A transformer characterized by being placed across two banks of three-phase transformers.