JPS58124216A - Assembling of split type transformer - Google Patents

Abstract

PURPOSE:To improve the assembling workability of a split transformer by assembling leads and insulating barriers, manufacturing a connecting duct structure that insulating spacers are mounted on the holes of both ends, mounting both end holes on a tank of the unit transformer at the time of assembling the transformer, and connecting the leads to coil leads. CONSTITUTION:A conservator 13 is formed at the center of a connecting duct 5, and leads 6 are inserted into the interior to match the shape of the duct 5. Then, insulating barriers 11 of different diameters are inserted into the interior of the duct, are disposed at both the interior and the exterior around the leads 6, and holding members are inserted between the leads 6, barriers 11 and the duct 5, thereby holding the duct 5. Subsequently, the duct 5, the leads 6 and the barriers 11 are integrally dried, both ends are sealed with insulating spacers 14 having lead terminals 15, and a connecting duct structure filled with insulating oil is manufacture. The connecting duct structure is transported to a site together with the unit transformer, and the unit transformers 1A, 1B are connected as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for assembling a split type transformer, which connects split plank unit transformers with a connecting duct having built-in leads.

[Technical background of the invention]

In recent years, transformers have tended to have larger capacities and larger sizes; for example, 50
The transformer used for 0 kV class power transmission has a single 7-metal equivalent of 1. 1500/3MVA ~2000/3MVA
However, due to size constraints for transportation, the single-phase converter is divided into two or three parts. Furthermore, a 1000 kV class power transmission transformer has a structure in which a single-phase transformer is divided into two to four parts.

In order to reduce the amount of work required for on-site assembly of such split type transformers, each unit transformer is transported with its contents assembled, and then transported to the substation where the transformer is installed. The assembly method generally adopted in the field is to connect each unit transformer in parallel via a connecting duct with built-in leads.

FIG. 1 shows a schematic connection state in a split type transformer. In the figure, this is a unit transformer to be connected to IA, IB, and Irl, and the internal core 3 and winding 4 of the tank 2 are built into this along with green oil. In addition, 5 is a connection duct,
6 is a lead provided inside the connection duct 5. When assembling the transformer, connect the connecting duct 5 to each unit transformer I.
A, IB (installed across the Ip tank 20, the lead 6 provided inside this connection duct 5 is connected between the high voltage side terminal of the winding 4 in one unit transformer IA and the winding in the other unit transformer IB. The high voltage side terminal of the winding 4 of the other transformer IB is connected in parallel to the high voltage side terminal of the winding 4 of the other transformer IB. is filled with insulating oil 2 in the same way as tank 2. Note that the intermediate voltage side terminals and low voltage side terminals of each unit transformer JA and IB are similarly connected in parallel via connection ducts (not shown). .

When connecting unit transformers, insulation can be achieved with a 500kV transformer simply by passing an insulated lead through the connection duct, but with a 1000kV class high voltage transformer, connections are required to provide greater insulation strength. A configuration is employed in which multiple insulating barriers surround the leads within the duct.

FIG. 2 shows a connection situation using multiple barrier general girder connection ducts. The metal connection duct 5 has both ends open and both ends bent upward, and this connection duct 5 has both ends opened at the connection port 8 formed in the tank 2 of each unit transformer IA and JB. Attach by bolting the parts.

The lead 6 is coated with an insulating coating 9, and is provided inside the connection duct 5 in a bent state according to its shape.
0 both ends of each unit transformer 7A.

Connect to the winding lead 10.10 provided in the tank 2 of the IB. The insulating noarium 11 has a cylindrical shape formed from a rigid press pod or the like to provide mechanical strength, and is divided into a plurality of straight members 11a and bending members 11b to be bent according to the shape of the connecting duct 5. These ends are overlapped and joined. Insulating barrier 11
Inside the insulating duct 5, a plurality of sets having different diameters are provided in combination inside and outside so as to surround the lead 6. Note that the insulating barrier 11 and the lead 6 are held in the connection duct by a holding member (not shown).

When assembling a conventional transformer, the connecting duct 5 is attached to the tank λ of the unit transformers JA, IB, and the high voltage side lead 10 of the winding is passed through the lead 6 inside the connecting duct 5.
and then each member 11 a of the insulating barrier 11
The assembly work was carried out by sequentially attaching and assembling the p 1 l b inside the connecting duct 5 through a working opening 12 such as a manhole formed in the connecting duct 5. Note that an operator enters inside the tank 2 to connect the lead 6. That is, the lead 6 itself has flexibility and can be bent to fit the sb connection duct 5, but the barrier 11 has no flexibility as a whole, so it is divided into parts 5- to fit the connection duct 5. Therefore, conventionally, the insulation barrier 11 is assembled at the time of assembling the transformer.

[Problems with background technology]

However, in such a method of assembling a transformer, the member 11 constituting the insulation barrier 11 provided in the connection duct 5
Due to the large number of a e 1 l b, insulation paryat 1
It takes time to assemble the transformer, and it takes time to assemble the transformer. The presspod used for the insulating barrier 11 is pre-dryed, but even after drying, if the assembly process takes a long time, the insulating barrier 11 will be in contact with air for a long time. The disadvantage is that it absorbs moisture, impairing the reliability of its insulation.

In addition, since performance tests are performed on split-type transformers while assembled at the factory, and then disassembled, transported, and reassembled on site, there are many disassembly and assembly operations, and the insulation barrier 11 is assembled each time. Barrier 11
Since it is exposed to air, there is a risk that the insulation performance of the connection duct 5, that is, the insulation barrier 11, which was confirmed in the factory test, will deteriorate during on-site assembly.

[Purpose of the invention]

The present invention is an assembly method for connecting a p-unit transformer with a connection duct containing an IJp surrounded by an insulating barrier, which improves the workability of the assembly work, reduces the number of times of assembling the insulating barrier, and reduces the number of times the insulating barrier is assembled. The present invention provides a method for assembling a split type transformer that can maintain insulation performance.

[Summary of the invention]

The method for assembling a split type transformer of the present invention is to assemble and provide a lead and an insulating barrier inside a connecting duct in advance, and attach insulating spacers with lead terminals to openings at both ends of the connecting duct to form an integral connecting duct. Fabricate the structure,
When assembling the transformer, the openings at both ends of the connecting duct are attached to the tank of the unit transformer via insulating spacers, and the leads are connected to the winding leads.

[Embodiments of the invention]

The assembly method of the present invention will be described with reference to an embodiment shown in FIGS. 3 and 4. This embodiment is applied to the case where unit transformers are connected in the connection state shown in FIG.

First, a connecting duct structure shown in FIG. 3 is manufactured. That is, the connection duct 5 having the above-described configuration is prepared. A conservator 13 having a valve 13h is provided in the center of the connecting duct 5. The insulated edge 9 is applied, and the cable 6 is bent to match the shape of the connection duct 5 and inserted into the connection duct 5. Next, for example, two sets of insulating barriers 11 having different diameters are placed inside the connection duct 5, and are arranged to surround the lead 6 and separate the inside and outside, and attach a holding member (not shown) such as a spacer to the lead. 6. Insert between the insulating barrier 1 and the connecting duct 5 and hold it in the connecting duct 5.

In this case, the insulating barrier 11 is first
After inserting the bending member 11b, the circumferentially divided bending members 11b are joined and assembled, and the outer layers are subsequently assembled in the same manner.

Next, the connecting duct 5, the lead 6 built into the connecting duct 5, and the insulating barrier 1 are dried by a method such as storing them together in a drying oven.
1 is dried.

Next, insulating spacers 14 having lead terminals 15 are attached to the openings at both ends of the connection duct 5 by bolting, and the openings at both ends of the connection duct 50 are sealed. The insulating spacer 14 is made of an insulating material such as synthetic resin and has a disk shape, and has a central portion 14a that protrudes. A lead terminal 15 is inserted into this central portion 14a, one end of the lead terminal 15 is connected to each end of a lead 6 provided inside the connecting duct 5, and the other end is connected to the connecting duct 5 from the central portion 14a.
protrudes outward.

Further, the valve 13h is opened and insulating oil is injected into the multi-connection duct 5 from the controller jA13, and the entire inside of the connection duct 5 closed by the insulating spacer 14 is filled with insulating oil.

In this way, the lead 6 and the insulating barrier 11 are integrated inside the connecting duct 5, and both ends of the connecting duct 50 are sealed with the insulating spacer 14 provided with the lead terminal Q-15. Fabricate a connecting duct structure filled with insulating oil.

The connecting duct structure is then stored as is and transported to the site where the transformer will be installed.

Furthermore, when assembling a transformer for performance testing at a factory or when assembling a transformer on-site, a connecting duct structure is prepared and each unit transformer 7A to be connected to each other is
, IB are connected by a connecting duct structure. That is, as shown in FIG. 4, the connecting duct 5 is arranged between the tanks 2 of the unit transformers IA and IB, and both ends of the connecting duct 5 are connected to the connecting ports 8 of the tanks 2 via intermittent spacers 14, respectively. Attach e by tightening the bolts. The connecting duct 5 connects to the unit transformer JA via an insulating spacer 14.

It is attached separately to the tank 2 in the IB, and the connection port 8 of the tank 2 is sealed with an insulating spacer 14. Next, the lead terminals 15 provided on the respective insulating spacers 14 attached to the openings at both ends of the connection duct 5 are connected to the high-voltage side of the winding provided inside the tank 2 of each unit transformer JA, IB10-. Connecting. A worker enters the tank 2 to carry out this connection work. Finally, each unit transformer JA.

Fill tank 2 of IB with insulating oil.

Therefore, in the assembly method of the present invention, the above-mentioned connection duct structure is manufactured in advance, and the connection duct structure is used in the configuration from 1 to 1, which is manufactured without disassembling and assembling the connection duct structure at the time of assembling the transformer at the factory. Next, the connecting duct structure and the unit transformer are transported to the site, where the unit transformer 7A is used as it is without assembling the connecting duct structure.
.

Connect IB. Since the connecting duct structure is made by assembling the lead 5 and the insulation barrier 11 inside the connecting duct 5 and integrating these, the connecting duct 5 is connected to the tank 2 of the unit transformers IA and IB when assembling the transformer. There is no need to assemble the leads 5 and the insulation barrier 11 in just a few steps, and there is almost no need to assemble the unit transformers IA and IB, so the transformer assembly work becomes easier. In particular, since there is no need to assemble the insulation barrier 11, the assembly time is greatly shortened and the insulation barrier 11 does not come into contact with outside air during the assembly of the transformer. Also,
By sealing the connecting duct 5 with an insulating spacer 14, the insulating barrier 11 provided inside the connecting duct 5 is isolated from the outside air, and by filling insulating oil inside the connecting duct 5, the entire connecting duct is insulated. The insulation performance of the insulation barrier 11 can be maintained by preventing the insulation performance from deteriorating due to moisture absorption when the barrier 1 comes into contact with external air. Therefore, by assembling and enclosing the insulating barrier 11 inside the connecting duct 5, the insulating barrier 11 does not come into contact with external air not only during storage and transportation of the connecting duct structure but also when assembling the transformer. The original insulation performance of the barrier 11 can be consistently maintained.

Furthermore, by sealing the connecting duct 5 with the insulating sweep 14 having the lead terminal 15, the connecting duct 5 can be lubricated and transported separately, and only the tank 2 needs to be lubricated at the site, making the lubricating work easier. .

In the embodiment described above, the conservator 13 is connected to the connecting duct 5.
By providing the connecting duct 5, expansion due to temperature of the insulating oil put into the connecting duct 5 is absorbed. However, the present invention is not limited to this. Alternatively, a bellows 16 may be interposed between each divided portion so that expansion of the insulating oil is absorbed by the expansion of the bellows 16.

The insulating spacer 14 that seals the openings at both ends of the connection duct 5 is not limited to the disk shape of the embodiment described above. For example, FIG. 6 shows a case where an insulating spacer 17 having a hollow cone shape is used. In this case, the insulating spacer 1q is attached so that the protrusion of the hollow cone faces inside the connecting duct 5. For example, the lead terminal 15 can be prevented from protruding outside the insulating spacer 17, and the insulating spacer 1 can be
7, the protective cover can be easily attached, and the insulation performance is also increased.

Further, FIG. 7 shows a case where a pleated insulating spacer 18 is used, and in this case, the insulation properties of the insulating spacer 13-spacer 18 can be improved, and the insulating barrier 11 is supported by the pleated portion of the insulating spacer 18. can. Note that the conservator of the connecting duct 5 is omitted in FIGS. 6 and 7.

Furthermore, the assembly method of the present invention is applicable not only to the case shown in FIG. 1 but also to the case where the lower part of the tank 2 of 1B is connected to each unit transformer 1 with the connection duct 19 as shown in FIG. can.

Note that the insulating barriers 11 may be provided in one set instead of multiple.

〔Effect of the invention〕

As explained above, the method for assembling the split type transformer of the present invention involves assembling and providing the leads and the insulating barrier inside the connecting duct, and integrating them, and openings at both ends of the connecting duct using insulating spacers having lead terminals. A connection duct that is tightly sealed and filled with insulating oil inside the connection duct) Jfl
J is manufactured in advance, this connecting duct gutter body is transported, and each unit transformer is connected to the connecting duct structure on site.
The assembly work when assembling the transformer is easy, and
The insulation barrier only needs to be assembled once, and it is possible to prevent the insulation properties of the insulation barrier from deteriorating due to moisture absorption during work. Further, since the connecting duct structure is closed not only during storage and transportation, but also when assembling the transformer, it is possible to prevent the insulating property from deteriorating due to moisture absorption in the insulating barrier.

Therefore, it is possible to improve the workability of assembling the transformer, and to maintain good insulation by the insulation barrier at the connecting portion of the unit transformer.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of the connection state of unit transformers in a split type transformer, Fig. 2 is a sectional view showing an example of the connection part of a conventional unit transformer, and Figs. 3 and 4 are respectively 3 is a cross-sectional view showing a connecting duct structure, FIG. 4 is a cross-sectional view showing a connecting duct connected to a unit transformer, FIG. 5, FIG. 6, and FIG. FIG. 7 is a sectional view showing another embodiment of the connection duct structure, and FIG.
The figure is an explanatory diagram showing another example of the connection state of the unit transformer. JA, JR...unit transformer, 2...tank, 3...
・Iron core, 4...Winding, 5...Connection duct, 6...
Lead, 10... Winding lead, 1 No... Insulating barrier, 11a... Straight member, 11b... Bent member, 13
...Conservator, 14...Insulating spacer, 15.
...Lead terminal, 17.18...Butt % page, 1
9...Connection C duct.

Claims (1)

[Claims] At least two divided unit transformers are connected by a connecting duct containing built-in leads insulated by an insulating barrier, in which the leads and the insulating barrier are accommodated and arranged inside the connecting duct, and these are integrated into one unit. After recording,
The openings at both ends of the connection duct are sealed with insulating spacers provided with lead terminals to be connected to the leads, and then insulating oil is injected into the inside of the connection duct to fabricate a connection duct structure, and the connection is made when assembling the transformer. Prepare a duct structure, attach both ends of the connection duct to the tank of each unit transformer to be connected via the insulating spacer, and connect the lead terminal of the insulating spacer to the winding lead inside each unit transformer. A method for assembling a split-type transformer, characterized in that it is connected to.