JPS62229910A - Method of assembling split type transformer - Google Patents

Abstract

PURPOSE:To reduce time for assembly work and reduce time of exposure of contents of transformers by a method wherein screw holes are provided in flange upper surfaces of bottom tanks which are divided for the respective phases and the bottom tanks are connected and fixed by tightening and welding with specific connecting members at the time of factory assembly and assembly at site respectively. CONSTITUTION:Screw holes 11 are provided in flange upper surfaces 14, which face divided tanks, of bottom tanks 5a which are divided for the respective phases. At the time of factory assembly, the botfom tanks 5a are connected by tightening and fixing connecting members 10 in which holes are provided to the upper flange surfaces 14 with bolts 12 gearing fhe screw holes 11 through gaskets 13. At the time of assembly at site, the bottom tanks 5a are installed in the state of being covered with temporary covers 8 and connecting members 9 are placed between the flange upper surfaces 14 and the bottom tanks 5a are connected by welding the flange surfaces and connecting members together.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) Invention 11 relates to an improvement in a method for assembling a nine-part transformer by dividing a friend tank to reduce the weight and dimensions during turret transport. It is.

As power transmission voltages have become higher, the capacity of transformers used for transmission and transformation has also increased. Furthermore, power transmission distances are becoming longer, and transformers are often installed in mountainous areas where transport conditions are even more difficult, so there is a desire to significantly reduce the weight and size of transformers during transport.

Therefore, conventionally a structure has been adopted in which the contents and tank of a three-phase transformer are divided for each phase, and these unit transformers are connected and assembled into three phases at once to form a three-phase transformer on site. There is. However, in this case, the transport weight of the unit transformer is 1
The limit for 1 is about 50), and in the case of more severe transportation conditions, the following structure is adopted.

As shown in FIG. 1, the contents 1 of a three-phase transformer, which consists of an iron core 2 and a winding 3, is composed of JA, JB, and IC for each phase. A tank 5 storing contents 1 together with insulating oil is divided into three or more parts 5a, 5b, 5c in the height direction. However, the central tank 5b facing the winding portion is not divided into individual phases but has an integral structure. The contents of the lower tank 5a are JA, 2 for each phase.
Divide into each phase to support B and JC. The lowermost tank 5a, which is divided into each phase, connects adjacent flanges facing each other by a connecting member 9. As shown in FIG. 5, the structure of the connecting portion is such that the connecting members 9 are placed one on top of the other on the seven run surfaces 14 of the lower tank 5, and are firmly connected to each other by welding. Factory tests are conducted in this state, and after the factory tests are completed, each phase is divided again and assembled for transportation. The procedure is to cover the upper cover 5c.
, remove the central tank 5b, remove the core upper yoke 2b1, remove the winding 3, remove the core legs 2a, and lower tank 5a, as shown in Figure 2, with the temporary cover 8f installed and the connecting members 9 and 7. The welded part with the runno surface 14 is cut with a gas torch and disassembled. Iron core upper yoke 2b.

The winding 3 is placed in a transport tank and shipped separately. At the site, each phase transportation unit is lined up at the regular installation position as shown in FIG. 2, and the connecting members 9 are all placed between the seven runs of the lower tank 5a and are firmly connected by welding. Then, the temporary cover 8 is removed, each phase winding 1M3 is inserted into the core leg 2a, the three-phase integrated central tank 5b is assembled, and the upper yoke 2b is inserted into the core leg 2a to remove the upper tank 5c. Thereafter, the lead 16 and the bushing 17 are connected, the insulating oil 6 is sealed inside the tank, and the tank is reassembled into the state shown in FIG.

(Problem to be Solved by the Invention) However, as explained above, if the connecting part is a welded structure, it will take a lot of time to remove the connecting member 9 when assembling it for transportation after the factory test. Furthermore, since the iron core and insulators are exposed to the air during that time, there is a risk of moisture absorption, and since a gas cutter is used to disassemble the welded parts, there is a risk of foreign matter being generated and getting mixed into the contents. Nine.

The present invention has been made in view of the above points, and aims to shorten the working time when re-disassembling each phase unit after the factory test and assembling it for transportation, and shorten the exposure time of the contents of the transformer. Another object of the present invention is to obtain a method for assembling a split type transformer without contaminating the contents of the transformer with foreign matter and without worrying about oil leakage during on-site assembly.

[Structure of the Invention] (Companion means for solving the problem and its operation) The method for assembling a split type transformer according to the present invention is such that the split transformer is divided into units of each phase, and A large hole is provided in the part where the divided tanks face each other, and a hole is made in the part that corresponds to the screw hole during factory assembly.Then, the slow-setting material is bolted into the screw hole through the gasket and identified and assembled. In addition, during on-site assembly, after installing the lower tank of each phase unit in the official installation position with a temporary cover attached, a connecting material is placed between the 7 runs of the lowest tank, and the connection is fixed by welding. be.

(8j! Example) A method of assembling a split type transformer according to the present invention will be described below with reference to FIGS. 1 to 4. The same parts as in the prior art are given the same reference numerals. As shown in Figures 1 and 2, each phase unit JA
The structure of the transformer contents 1 consisting of , JB, and JC and the tank 5 that houses them are the same as in the conventional case, and the transportation method is also the same.

A screw hole 11 is provided in the upper part of the flange 14 of the lowermost tank 5a divided into each phase unit, and in the part where the divided tanks face each other.
will be established. When assembled at the factory, screw hole 11 is inserted as shown in Figure 3.
A connecting member 10 having a hole in a corresponding part is tightened and connected to the run surface 14 of the upper part 7 via a gasket 13 by means of a bolt 12 which is screwed into a screw hole 11. Here, the reason why the transformer is tightened through a gasket is to shorten the working time and to reduce the exposure time of the transformer contents 1 when each phase is disassembled again after the factory test and reassembled for transportation. During on-site assembly, the lower tank 5a for each phase is installed at the regular installation position. At this time, the lower tank 5a is installed with the temporary cover 8 removed. Then, as shown in FIG. 4, a connecting member 9 is placed between the upper seven run surfaces 14 of the lower tank 5a, and the seven run surfaces and the connecting member are fixed and connected by welding.

The reason why the temporary cover 8 is attached to the lower tank 5a in the following state is to prevent foreign matter from entering the inside of the tank during welding. The reason for using welded construction for on-site assembly is that with a gasket-based tightening structure, there is a risk of oil leakage due to deterioration of the gasket, and the need to replace the gasket from time to time.

[Effects of the Invention] As explained above, according to the present invention, screw holes are provided on the upper surface of the bottom tank divided into each phase unit and in the portion where the divided tanks face each other, and factory assembly is possible. At the time of installation, a hole is made in the part facing the screw hole, and then a slow-setting material is tightened and fixed through a gasket. Also, during on-site assembly, a connecting material without bolt holes is placed between the flanges of the lower tank, and a temporary cover is placed. a
By adopting a structure in which the transformer is fixedly connected with m-contact in the secondary state, it reduces the work time when re-disassembling each phase unit after the factory test and assembling it for transportation, shortens the exposure time of the contents of the transformer, and reduces the time required for factory and It is possible to obtain a method for assembling a split type transformer that prevents foreign matter from entering the contents during on-site assembly and eliminates concerns about oil leakage.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a split type transformer according to the present invention, Fig. 2 is a front view showing a method of assembling the transformer on site, and Fig. 3
The figure is a sectional view showing the connection B structure during factory assembly, FIG. 4 is a sectional view showing the connection structure during on-site assembly, and FIG. 5 is a sectional view showing the conventional connection structure. 1, IB, IC... contents of each phase unit, 2... iron core,
3...Winding, 4m, 4b...Upper and lower clamps, 5a
. 5b, 5a...Divided tank, 6...Insulating oil, 8...
・Temporary cover, 9, , JO...Connecting material, 11...
・Screw measure, 12...Bolt, 13...Gasket,
14... Franz side. Applicant's agent Patent attorney Takeshi Suzue 2 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] The contents of the transformer, which consists of the iron core, windings, etc., are divided into two or more parts, and the tank that stores the transformer contents is divided into three or more parts in the height direction, and the top and bottom tanks are divided into two or more parts. In the method for assembling a split type transformer, the central tank facing the windings is sized to accommodate all the contents at once, and the flanges of the bottom tank are connected by a connecting material. A screw hole is provided on the upper surface of the adjacent flanges that face each other, and on the upper surface of the part where the divided tanks face each other. During factory assembly, the connecting material is bolted to the screw hole via a gasket, and during on-site assembly. This is a method of assembling a split type transformer in which the flanges of each bottom tank are directly welded and fixed using a connecting material.