JPH0612733B2 - Gas insulated switchgear direct connection transformer transportation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to an improvement in transportation and assembling means of a gas-insulated switchgear (hereinafter referred to as GIS) direct connection type transformer.

(Prior Art) In the case of a GIS direct coupling transformer, as shown in FIG.
As means for connecting S, a bushing pocket 2 is projectingly provided on the transformer tank 1 by bolting or welding structure, and a bushing receiving seat 3 is attached to the tip of the bushing pocket 3 by bolting or welding structure, and the gas-oil bushing attached here. 4 is linked to GIS. That is, the oil side of the gas-oil bushing 4 is inserted into the insulating oil in the bushing pocket on the transformer side, and the gas side is inserted into the insulating gas of the GIS connection box 5 to keep the seal by bolting.

The gas-side insulation of the gas-oil bushing 4 of the GIS direct coupling transformer constructed as described above is ensured that proper insulation gas and its proper pressure are provided in the GIS connection box 5 and the insulation between the ground and the gas-oil bushing phase is not achieved. The strength will be maintained.
Therefore, the GIS connection box 5 is not attached, and the gas-oil bushing 4 alone cannot withstand the test voltage. Therefore, as shown in FIG. 4, it is general practice to attach a test pocket 6 to the tip of the bushing pocket 2 and attach a temporary test air bushing 7 thereto.

(Problems to be solved by the invention) With a gas-oil bushing, the test voltage cannot be withstood if the gas side is exposed to the atmosphere, so instead of this, a temporary air bushing 7 was attached and a factory test was conducted. in case of,
This means that the insulation strength and sealing characteristics of each part in the final assembled state have not been confirmed. That is, the combination of the bushing pocket 2 and the gas-oil bushing 4 on the transformer side and the GI.
The combined portion of the S connection box 5 and the GIS side of the gas-oil bushing 4 is not confirmed.

Further, in order to attach the provisional test bushing 7, it is necessary to manufacture the test bushing 7 and prepare the test bushing 7 itself, which is economically disadvantageous. In order to solve these problems, the transformer and the GIS equipment directly connected to the transformer are manufactured before the transformer, and after the factory test is completed for the GIS equipment as a single unit, some of these GIS equipment are combined with the transformer. It is conceivable that a test of the transformer alone will be carried out depending on the situation. This will be explained with reference to FIG. 5. A gas-oil bushing 4 is attached to the bushing receiving seat 3, and a G-oil bushing 4 is attached to the tip of the gas-oil bushing 4.
The air bushing 9 used at the receiving / transmitting end of the GIS equipment is attached via the IS junction box 5 and the gas insulating busbar 10 for attaching the air bushing.

When configured in this way, extra G is needed for transformer testing.
It is economical because it is only necessary to adjust the production time of the originally required items without producing IS equipment. Further transformer and GI
The quality of the S connection part can be confirmed at the factory, and there is an advantage that highly reliable electric equipment can be obtained.

The present invention reduces the decomposition range as much as possible when shipping the product whose quality has been confirmed by the test in the factory in this way,
The objective is to obtain a method of transporting GIS direct-coupled transformers that improves transport efficiency, shortens assembly time at the installation site, and ensures quality.

[Structure of Invention]

(Means and Actions for Solving Problems) The present invention is a transformer as a decomposition point when shipped from a factory.
Between the bushing pocket, GIS junction box and the gas insulated busbar, a blind lid is attached to each disassembly point, and the transformer tank is a single unit. The bushing pocket, gas-oil bushing and G
The IS junction box is transported as an integrated unit, and on the other hand, on-site assembly is only reassembled at the disassembly point.

(Embodiment) FIG. 1 shows an embodiment of the present invention. This FIG. 1 shows the configuration of the bushing pocket 2, bushing receiving seat 3, gas-oil bushing 4 and GIS junction box 5 during transportation after the combined test of the GIS and transformer of FIG. That is, as the disassembly point after the test is completed, cut off between the transformer tank 1 and the bushing pocket, and the flange portions of the GIS connection box 5 and the gas-insulated busbar 10 for mounting the air bushing. In this way, the transformer body, transformer-G
Basically, the unit is divided into the IS joint and the gas-insulated bus bar for mounting the air bushing. Of course, the parts that are not used in the combined test with the transformer, such as the gas-insulated busbar 8, the circuit breaker, the disconnector, the gas-insulated switchgear 10 composed of CT, PT, etc., should be of an appropriate size considering the transportation conditions. Disassemble and transport separately.

In this way, the transformer that is basically divided into three parts-GIS
FIG. 1 shows the transportation package of the joint.

A blind lid 13 is attached to the end of the bushing pocket 2 and a blind lid 14 is attached to the end of the GIS connection box 5, and each is sealed and an inert gas or the like is enclosed as necessary. Bushing seat 3
Is provided with a hanging ear 16 that can lift the entire weight slightly closer to the GIS connection box 5 than the center of gravity 15 of the entire body, and an auxiliary hanging ear 22 is provided at the end of the bushing pocket 2.

On the upper surface of the bushing pocket 2, a mounting seat 17 for fixing a conservator 18 for the gas-oil bushing 4 only during transportation.
Is provided with a conservator 18, and the conservator 18 and the gas-oil bushing 4 are attached to a rubber hose.
Connected at 19. Reference numeral 23 is a sleeper that can be put between the floor and the transport carriage.

It was first disassembled after the GIS-transformer combination test in Fig. 3 was completed.
As shown in the figure, by integrally transporting the transformer-GIS coupling part, the gas-oil bushing 4 and the oil-tight gas-oil bushing 4 between the bushing receiving seat 3 and the gas-oil bushing 4 of the coupling part, which has many quality problems, are transported.
And the assembly of the part related to the gas leakage of the GIS connection box 5 is required only in the factory where the condition is good over all facilities and environment.
It can be shipped after confirming the quality through factory tests.

Since the total weight hanging ear 16 is attached to the GIS connection box slightly from the center of gravity of the whole, the main rope 20 that can be lifted up is hung on this hanging ear 16, and the auxiliary rope 21 is attached to the auxiliary hanging ear 22 to achieve horizontal balance. Keep In this case, the bushing pocket 2 side is slightly lowered so that the gas-oil bushing is not subjected to impact force when landing when the whole is hung.

This hoisting method can be commonly used at the time of assembling / disassembling at the factory and at the time of on-site assembly. That is, at the time of factory assembly, it can be mounted on the transformer as a building block on the floor, so that assembly work at high places can be reduced. Gas-oil bushing 4
Contains bushing oil inside the bushing, and the conservator 18 needs to be filled with insulating oil in order to respond to expansion and contraction of this bushing oil due to temperature changes and the bushing must be filled with gas-oil. Mounting seat 17 provided on the upper surface of the bushing pocket 2 at a position higher than the bushing 4
And is connected to the gas-oil bushing 4 by a rubber hose 19. As a result, since the positional relationship between the gas-oil bushing 4 and the conservator 18 is always constant during transportation as well as during field assembly, reversal of the positional relationship prevents air and gas from entering the bushing. Work becomes easy. After the installation of the transformer-GIS connection part on the transformer body at the site is completed, the valves 24 on the conservator side and gas-oil bushing side are temporarily
The final assembly is completed by tightening and assembling the conservator 18 at the proper mounting position and replacing the rubber hose 19 with the proper pipe.

In the description, the case where the conservator 18 is originally attached at another position is described, but it goes without saying that when the conservator 18 is attached to the bushing pocket 2 even in the final assembly, a regular pipe that replaces the conservator and the rubber hose may be used.

〔The invention's effect〕

According to the present invention, the transformer-GIS coupling is replaced by a transformer-GIS.
By transporting as a unit after the combination test, it is possible to assemble the oil-tight and gas-tight parts, which are important points in terms of quality, under good working conditions in the factory environment. As a result, it is possible to ensure quality while at the same time disassembling in the factory and improving efficiency by reducing the number of transport parts.
Economical GI that can reduce man-hours by shortening local assembly time
An S direct coupling transformer is obtained.

Bushing pocket, gas-oil bushing and GIS
When the connection box is combined and the total weight is lifted, the mounting position of the hanging ear is set slightly closer to the GIS connecting box side than the center of gravity of the whole, and the auxiliary hanging ear is provided on the opposite side of the bushing pocket. It is possible to arbitrarily keep the posture horizontal so that abnormal force is not applied to the gas-oil bushing, which is the weakest point in strength, or to make the GIS junction box side slightly higher and the opposite bushing pocket side lower for safety. Therefore, there is no risk of damage to the gas-oil bushing, and safe work is possible. By temporarily installing the conservator on the upper surface of the bushing pocket and temporarily connecting it with a rubber hose,
Since the conservator is stably positioned above the gas-oil bushing, air and gas are prevented from entering the bushing, which is a key point in ensuring the quality of the gas-oil bushing itself. Becomes

As described above, according to the present invention, the GIS-transformer coupling part confirmed in the factory test can be reproduced as it is by the field assembly, and a safer and more economical GIS-transformer direct coupling transformer transportation method can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a front view showing a combined use state of a transformer and GIS equipment, and FIG. 4 is a GIS direct connection. Fig. 5 shows a front view of a transformer tested independently, and Fig. 5 shows a GIS direct connection transformer and GI.
It is a front view which shows one Example at the time of performing a test using a part of S equipment. 1 ... Transformer tank, 2 ... Bushing pocket 3 ... Bushing receiving seat, 4 ... Gas-oil bushing 5 ... GIS junction box, 6 ... Test pocket 7 ... Test air bushing, 8 ... … Gas insulated busbar 9 …… Air bushing 10 …… Gas insulated busbar for mounting air bushing 11 …… Gas insulated switchgear, 12 …… Temporary stand 13 …… Blind lid, 14 …… Blind lid 15 …… Overall Center of gravity, 16 …… Folding ears 17 …… Mounting seat, 18 …… Conservator 19 …… Rubber hose, 20 …… Main rope 21 …… Auxiliary rope, 22 …… Auxiliary hanging ear 23 …… Sleeves, 24 …… Valve

Claims (1)

[Claims] 1. Disassembling points when shipped from the factory are transformer-bushing pocket, gas-insulated switchgear connection box-gas-insulated busbar, and a blind lid is attached to each disassembly point, and the transformer tank is a single unit. , Bushing pockets, gas-oil bushings, and gas-insulated switchgear connection boxes are transported as an integrated unit, and on-site assembly is performed only by reassembling the disassembly point. Method.