JPS604585B2 - split type transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention simplifies the structure of the tank and lead duct in a split type transformer in which the contents of the transformer are stored separately in a plurality of tanks and then assembled and transported, thereby increasing the transport limit. , the manufacturing cost is low.

In general, it is convenient, economical, and reliable to transport transformers in a fully assembled state, and is most desirable. However, if transporting fully assembled is not possible due to size and weight restrictions or other reasons, , the contents assembly transport method is used, in which only the contents of the transformer (core and windings) are completely assembled and transported in a sealed tank.

However, in cases where the transport limit for a single transformer is exceeded, such as a particularly large-capacity transformer, the contents of the transformer are stacked in multiple tanks and divided into the smallest transformer units for transportation, and then transported at the installation site. Each tank is connected by a lead duct, and the line terminals of each transformer winding in the tank are connected to complete the assembly of one transformer as a whole. The conventional configuration of this type of split transformer is explained for the three-phase transformer with taps on load shown in Fig. 1. Reference numeral 1 denotes a transformer tank divided into three parts, and the upper tank la
and a lower tank lb. The lower tank lb accommodates the contents of the transformer (not shown) which are assembled separately for each phase, and is sealed by the upper tank la.

Reference numeral 2 denotes a switch tank, in which a load tap changer 3 is hermetically housed.

These transformer tanks 1 and switch tanks 2 are arranged side by side in a line, a lead tank 4 is arranged above, and each tank is connected via a branch duct 5. It accommodates leads that connect the line terminals of the lines and tap leads 6 that connect the taps of the windings and the tap changer 3. Since this transformer is constructed by transporting each transformer tank and lead duct separately and erecting them at the site as shown in the figure, it is necessary to dry and lubricate the tank at the site. The inside of the lead duct is kept in vacuum for a predetermined period of time. For this reason, the upper tank la
The lead duct 4 is provided with vacuum-resistant reinforcement sections 7 and 8, respectively, to provide a vacuum-resistant structure. However, providing such a reinforcing member 7 in the upper tank la of a split type transformer is difficult because the outer edge of the reinforcing member 7 is close to the transport limit of the transformer, as shown in Fig. 2. If the transport dimensions of the container tank exceed the transport limit, it may interfere with ensuring safety during transport, making transport difficult or even impossible.Furthermore, the transport weight increases due to reinforcing materials, exceeding the transport limit. This was considered a problem that needed to be resolved due to transport limitations.

In addition, since it is necessary to install a reinforcing section for each divided transformer tank, there is a drawback that the installation time and material costs are increased compared to a single transformer, resulting in higher manufacturing costs. Furthermore, when housing winding connection leads and tap leads in a common lead duct that connects each transformer tank of a split type transformer, the required insulation distance must be maintained when wiring, which reduces the number of leads. In the case of high-voltage transformers, the shape and dimensions of the lead duct are inevitably large, and the strength against vacuum must be increased according to the size of the lead duct, so large-scale reinforcement is required. The need for additional members increases the weight of the lead duct, which is a factor that further increases the manufacturing cost of the split type transformer. This invention was made in order to solve the above-mentioned problems, and in terms of vacuum resistance, the lead duct is divided into two pieces having a cross-sectional shape smaller than the maximum, and the lead duct itself is By using reinforcing members for each upper tank of the divided transformer, both the upper tank and the lead duct have a simple structure that does not require two special reinforcing members, allowing sufficient margin for transportation limits. At the same time, the purpose is to significantly reduce the manufacturing cost of split type transformers.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a perspective view showing an embodiment in which the present invention is applied to the on-load tap-off special three-phase transformer shown in FIG. 2.
The basic shapes of the upper tank la and lower tank lb of the transformer tank 1, which is divided into three parts, are formed in the same manner as in the case of FIG.

Each side slope l of the trapezoidal upper tank la
c are arranged one after another in a line at appropriate intervals with the length direction matching the arrangement direction, and the switch tank 2 is arranged at the end. The bottom surfaces of a pair of reed channel ducts 4 are attached in close contact with and parallel to both side slopes lc of each upper tank la and both sides of the upper surface of the switch tank 2. The cross-sectional shape of each lead duct 4 is formed to have the largest possible dimension without exceeding the limit strength against vacuum. It is not necessary.The connection leads between the windings in each transformer tank and the tap leads 6 between the windings and the tap changer 3 are divided into two as appropriate.
The lead ducts 4 are divided into two parts and housed in a pair of lead ducts 4, respectively.
In the split type transformer configured as described above, the lead duct 4 connecting each transformer tank 1 and the switch tank 2 is brought into close contact with the slopes lc on both sides of the upper tank la, and is integrated with each upper tank la. Since the lead ducts 4 are arranged in parallel on both the left and right sides so as to form a structural structure, the lead ducts 4 themselves can be used as reinforcing members for each upper tank la.

In addition, since the lead duct 4 can be divided into two parts with the maximum cross-sectional shape, even when there are a large number of leads and the voltage is high, the wiring can be done with sufficient insulation distance between the leads. be able to.

In this invention, as described above, the lead duct that connects each transformer tank of a split type transformer is composed of two ducts that do not require reinforcement, and this pair of lead ducts serves as a substantial reinforcing member of the upper tank. It is configured to be.

Therefore, according to the present invention, there is no need to specially attach a reinforcing member to make the upper tank vacuum-resistant, and the external dimensions and weight of the transformer tank are reduced and reduced compared to the conventional ones, and the dimensions and Since there is extra weight, even transformers that could not be transported due to transportation limitations can be safely transported.

In addition, according to the present invention, the reinforcement section of the upper tank and the lead duct are both unnecessary, so the structure of the split type transformer is extremely simplified, and the man-hours for installing the reinforcement member are omitted and the material cost is reduced. Manufacturing costs can be significantly reduced. Furthermore, according to the present invention, there is no reinforcing member in the lead duct, and the pushing pockets 8 and 9 can be attached to any position on the lead duct.
It becomes possible to easily pull out the lead wire from the lead duct. The present invention is not limited to the on-load tap switching special three-phase transformer of the embodiment described above, but can be similarly applied to split-type transformers such as non-voltage tap switching transformers or single-phase transformers.

[Brief Description of the Drawings] Fig. 1 is a perspective view of a conventional special three-phase transformer with tap switching under load, Fig. 2 is an explanatory diagram showing the transport limit of the transformer, and Fig. 3 is a perspective view of a special three-phase transformer with tap switching during load of the present invention. FIG. 2 is a perspective view showing an embodiment of a tap-switching special three-phase transformer. 1: Transformer tank, LA: Upper tank, 4: Lead duct. Traditional 1 drawing 2 drawings 3rd drawing

Claims (1)

[Scope of Claims] 1. A split type transformer in which the contents of a transformer divided into a plurality of units are hermetically housed in separate tanks consisting of an upper tank and a lower tank, and the tanks are connected by a lead duct. A split type transformer, characterized in that the lead duct is molded into two parts each having a cross-sectional shape within a range that does not exceed a limit strength against vacuum, and the lead duct is attached as a reinforcing member against the vacuum of the upper tank. 2. A split type transformer according to claim 1, characterized in that the lead duct is provided with a bushing pocket.