JPS62216308A - On-load tap changing transformer - Google Patents

Abstract

PURPOSE:To eliminate the hanging removing space of the changeover switch breaker of an on-load tap changer by containing the breaker of the tap changer in a low gas pressure changeover switch chamber separated and sealed from a transformer body itself including a tap selector. CONSTITUTION:The changeover switch breaker 7 of an on-load tap changer of a transformer 50 in which insulating gas 51 is sealed under higher predetermined pressure than the atmospheric pressure is contained in a changeover switch chamber 53 having lower gas pressure than a tank 3 separated from and sealed by a barrier 52 from a transformer body 56 (including a core 4a and a coil 4b, etc.). An opened sidewall 54 is formed in the chamber 53. The tap selector 8 of the tap changer is contained in the same tank 3 as the body 56, and electrically connected through the barrier 52 with the breaker 7. Accordingly, when inspecting the breaker 7, the breaker 7 can be immediately inspected by removing only the gas 51 of the chamber 52 and removing the sidewall 54.

Description

[Detailed Description of the Invention] [Configuration of the Invention] (Industrial Application Field) The present invention relates to an on-load tap-changing gas insulated transformer equipped with an improved on-load tap changer installed particularly in an underground substation, etc. Regarding.

(Prior Art) In recent years, with the urbanization of cities, the density of population has been increasing year by year. The buildings being constructed in this metropolis are becoming larger as the number of people they house increases, and the amount of electricity they use is also increasing, so the capacity of the power equipment is also increasing. .

On the other hand, it is undesirable for power equipment installed in densely populated areas to have a fire hazard, and on-load tap changer transformers installed in underground substations use nonflammable gas instead of conventional oil-filled ones. It is a gas insulated transformer that uses the insulation medium. However, underground substations in densely populated areas usually have little space to install power equipment, and despite the demand for higher capacity, gas-insulated transformers require smaller installation space. . The biggest challenge in reducing the height of the on-load tap changer itself is to reduce the size of the on-load tap changer. Conventional on-load tap changers have a total length of about 4m when the changeover switch and tap selector are combined, and some large-capacity units can reach approximately 4m, and when combined with a transformer, they must be moved upwards for maintenance and inspection. I had the necessary lifting allowance to lift it. As a result, the height of the building is 10
Some items required m.

The details of such a conventional on-load tap switching transformer will be explained with reference to FIGS. 2 to 4.

In FIG. 2, reference numeral 1 denotes a concrete wall of a building, in which an on-load tap change transformer 50 is housed. 2,
Reference numeral 3 denotes a cover and a tank that constitute the outer circumference of the transformer 50, in which the iron core 4a is placed together with an insulating gas that is an insulating medium.
and a coil 4b are provided.

5 is a bushing that penetrates the side wall of the tank, and coil 4b
is connected to. Reference numeral 6 denotes a switching switch for a tap changer at the time of load, in which a load current interrupting section 7 is housed.

8 is a tap selector electrically connected to the switching switch;
It is electrically connected to the coil 4b.

Reference numeral 9 denotes an electric operating mechanism that drives the on-load tap changer in response to a signal from the control panel. 10 is a transmission device that connects the electric operating mechanism and the on-load tap changer. Reference numeral 11 is a chain block pulled by a hook 12 installed on the ceiling of the concrete wall of building 1. After suspending the switching switch breaker 7 upwards as shown in the diagram for inspection, etc., it is suspended above the floor for inspection work. is possible.

FIG. 3 shows an embodiment in which the on-load tap changer is arranged in an inverted configuration in contrast to the embodiment shown in FIG. 2, and is an embodiment used in a relatively large capacity transformer. In this embodiment, the breaker 7
This structure effectively utilizes the structurally dead space of the transformer by pulling it out downward. Further, FIG. 4 shows an embodiment in which the on-load tap changer is placed horizontally to reduce the space in the height direction.

(Problems to be Solved by the Invention) The conventional apparatus described above has the following problems. First, in the embodiment shown in Fig. 2, the on-load tap changer and breaker are lifted upwards, so there is a dead space that is not always used, and the height of the building needs to be higher than that. It was unreasonable. Third
In the example shown in the figure, a large-capacity container makes the most effective use of dead space and has a rational structure, but a medium- and small-capacity container does not have such a dead space and the same structure is not possible. It was possible. Furthermore, in the embodiment shown in FIG. 4, the height direction is limited by placing it horizontally.
In addition to requiring more lateral dead space than necessary for drawing out horizontally, the internal configuration of the transformer is very unreasonable as shown in Figure 4, and there are many parts inside the transformer. This is not a desirable configuration as it creates dead space.

Further, in the case shown in FIGS. 2 to 4, the switching switch 6 and the tap selector 8 are housed in the same transformer tank 3. The insulating gas in the tank 3 is normally sealed at a predetermined pressure higher than atmospheric pressure to improve insulation performance. Therefore, when pulling out the breaker 7 to the outside of the tank 3, all of the insulating gas in the tank 3 must be removed, which makes procedures such as refilling the gas again cumbersome, and reduces insulation reliability from the perspective of gas pressure management, etc. There are drawbacks to doing so.

The present invention was proposed in order to solve the problems of the prior art as described above, and its purpose is to eliminate the need for a space for lifting and pulling out the switching breaker section of the knob switch when the load is 4-. The object of the present invention is to provide an on-load tap changeover gas insulated transformer that can reduce the installation space, ensure gas pressure management of insulating gas, and has high insulation reliability.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a switching switch breaker of an on-load tap changer,
The transformer was configured such that a low gas pressure switching switch chamber was provided and housed in the chamber, which was isolated from the main body of the transformer including the tap selector, and an opening was provided in the side wall of the switching switch chamber.

(Function) With this configuration, it is not necessary to lift and pull out the switching switch breaker, the installation space for the transformer is reduced, and the breaker can be inspected without removing the insulating gas from the transformer tank. It is possible.

(Example) An example of the present invention will be described below with reference to the drawings. Note that the same parts as those of the conventional on-load tap-changing transformer are designated by the same reference numerals, and a description thereof will be omitted.

In FIG. 1, 50 is a transformer in which insulating gas 51 is sealed at a predetermined pressure higher than atmospheric pressure. The switching switch breaker 7 of the on-load tap changer is connected to the transformer main body 56 (iron core 4a,
(including the coil 4b, etc.) is a switching switch chamber 5 which has a lower gas pressure than the inside of the tank 3, which is separated and closed by a barrier 52.
It is stored in 3. Further, the switching switch chamber 53 is provided with an open side wall 54.

The tap selector 8 of the on-load tap changer is connected to the transformer main body 56
It is housed in the same tank 3 and is electrically connected to the switching switch breaker 7 via a barrier 52. Further, the switching switch breaker 7 and the tap selector 8 are driven in conjunction with each other by a transmission device 55 provided above the switching switch chamber 53 and the transformer tank 3.

According to the above configuration, when inspecting the switching switch breaker 7, the switching switch breaker 7 can be inspected immediately by extracting only the insulating gas 51 from the switching switch chamber 53 and removing the opening side wall 54.

Therefore, it is not necessary to lift and pull out the switching switch breaker 7 provided in the conventional transformer, so no inspection space is required, and the height of the building 1 can be made low and compact.

Furthermore, the lifting chain block 11 shown in the conventional device shown in FIG. A lifting and pulling device such as the hook 12 is not required.

Furthermore, since it is only necessary to extract the insulating gas from the switching switch chamber 53, it is not necessary to extract the insulating gas from the transformer body and the tank 3 on the side of the tap selector 8, thereby significantly improving insulation reliability and reducing the trouble of inspection work. I can do it.

〔Effect of the invention〕

As explained above, according to the present invention, the switching switch breaker of the on-load tap changer is housed in the switching switch room that is isolated and closed from the transformer main body, so that the breaker can be lifted. This eliminates the need for pulling out and reducing the installation space, and ensures gas pressure management of the insulating gas, thereby providing a tap gas insulated transformer with high insulation reliability.

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[Brief explanation of drawings]

FIG. 1 is a sectional view of an on-load tap-changing gas insulated transformer according to the present invention, and FIGS. 2, 3, and 4 are sectional views of different structures of conventional on-load tap-changing transformers, respectively. 1... Building 7... Breaking part of on-load tap changer 8... Tap selector 50 of on-load tap changer... Transformer
51... Insulating gas 52... Barrier 53
...Switching switch chamber 54...Opening side wall 55.
...Transmission device 56...Transformer body agent Patent attorney Norihiro Chika Ken Yudo Hirofumi Mitsumata 1st-d 2nd hearing O

Claims (1)

[Claims] A tank that houses the transformer body and is filled with insulating gas at a predetermined pressure, a switching switch chamber that is separated from the tank and filled with insulating gas at a pressure lower than the gas pressure in the tank, and An on-load tap switching transformer comprising a switching switch housed in a switching switch chamber, and a tap selector housed in the tank together with the transformer body and electrically connected to the switching switch.