JPS60198712A - On-three phase load tap-changing transformer - Google Patents

Abstract

PURPOSE:To limit spaces among windings and a tank at a minimum, and to miniaturize the titled transformer by constituting a tap winding by two layers and each leading out tap leads in several phase only from upper and lower one sides of the tap windings. CONSTITUTION:A transformer proper in which windings 2 in each phase are wound on several leg in a three-phase three-leg core 1 and an on-load tap changer 3 are housed in the same tank 4. The windings in each phase consist of high-tension windings, low-tension windings and tap windings, and tap leads 6 are lead out of the tap windings. The tap leads are wired up to the on-load tap changer 3 from the tap windings through a space between a clamp 5 and the tank 4 formed on the side of the clamp 5. The tap leads 6a, 6b in two phases are lead out from upper sections and the tap lead 6c in one phase from a lower section at that time. Accordingly, wiring spaces can be reduced, and the tank can be miniaturized.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a three-phase on-load tap changer transformer, and in particular improves the tap lead wiring from the tap winding to the on-load tap changer. This relates to a three-phase on-load tap changer transformer.

[Technical Background of the Invention] The contents of a transformer, in which a high-voltage winding, a low-voltage winding, and a tap winding are wound around each of the iron core main legs consisting of three legs, and an on-load tap changer are housed in the same tank. 1 = In a completely portable three-phase on-load tap-changer transformer, the tap leads pulled out from the tap windings of each phase are wired as they are in the tank and connected to the on-load tap-changer in the same tank. Connected.

Figure 1 shows an example of such a three-phase on-load tap-changing transformer, in which a three-phase winding 2 is connected to each main leg 1 of a three-phase tripod core.
A to 2c (written as a to C in order of proximity to the on-load tap changer) are wound inside the transformer and the on-load tap changer 3 are stored side by side in the longitudinal direction in the tank 4. It is something that Further, the upper and lower portions of the iron core 1 are supported by clamps 5. The tap leads 6a to 6C of each phase are pulled out from the top and bottom of the windings 2a to 2C of each phase, and after the top and bottom are connected outside the windings 2a to 2C of each phase, they are fixed to the outer periphery of the windings. It is wired. These phase tap leads 6a to 6C are a to
The tap leads 6a of the C phase are arranged in the upper, middle and lower dynasties in the order of the C phase, and the tap leads 6b of each phase are connected to the winding 12 of the C phase.
Tap leads 6C for a and c phases are C phase, winding 2a for each phase,
2b, and are connected to the on-load tap changer 3, respectively.

Figure 2 shows another example of a three-phase on-load tap-changing transformer, in which the tap windings of each phase are composed of two layers, and the tap leads 6a to 6C of each phase are drawn out from the top. It is something that will be done. In this example, the C phase tap lead 6
A is directly wired, and tap leads 6b and 6c of each phase C are wired through the space between the upper clamp 5 and the tank 4, respectively, and connected to the switch 3.

[Problems in the Background Art] However, according to the three-phase on-load tap-changing transformer shown in FIG.
~Winding 2a passes outside of 2C, so to ensure insulation distance
The dimension between ~2C and the tank 4 must be increased, and as a result, the tank becomes larger.

According to the Sanwa on-load tap switching transformer shown in Fig. 1, tap leads for at least two phases (one phase can be connected directly) are installed in the limited space between the clamp 5 and the tank 4. Because the tap lead has to be passed through, it is difficult to ensure sufficient insulation distance when the tap lead has a relatively high voltage.

[Object of the Invention] The present invention was proposed in order to solve the problems of the prior art as described above, and its purpose is to improve the wiring of the tap lead from the tap winding to the on-load tap changer. However, the Sanwa on-load tap-changing transformer according to the present invention has tap windings composed of two layers, and each By drawing out the phase tap lead from only the top and bottom of the tap winding, there is no need to pass the tap lead outside the winding, and the space between the winding and the tank is kept to a minimum. In addition, by reversing the top and bottom of the pull-out direction of the tap leads of each phase from the other two phases, the tap lead of one phase of the two phases with the same pull-out direction can be directly connected to the on-load tap changer. and the remaining 1
By passing the tap leads for one phase and the other phase between the upper and lower clamps of the tap winding and the tank, the space between the clamp and the tank is only for one phase, and the same space can be saved. This makes it possible to reduce the size.

[Embodiment of the Invention] An embodiment of the three-phase on-load tap-changing transformer according to the present invention as described above will be described with reference to the drawings.

In Fig. 3, each phase winding 2 is attached to each leg of a three-phase tripod core 1.
The main body of the transformer, in which the main body of the transformer is wound, and the on-load tap changer 3 are housed in the same tank 4. The windings of each phase are each composed of a high voltage winding, a low voltage winding, and a tap winding, and a tap lead 6 is drawn out from the tap winding. Note that in this diagram, leads from high and low voltage windings and bushings to which they are connected, which are not directly related to the present technology, are omitted.

The tap lead is wired from the tap winding to the on-load tap changer 3 through a space between the clamp 5 and the tank 4 formed next to the clamp 5. In addition, the tap winding is composed of two layers, with tap leads 68 to 6C for each phase.
The two-phase tap leads 6a and 6b are pulled out from the top, and the other one-phase tap lead 6G is pulled out from the bottom. The C-phase tap lead 6a closest to the on-load tap changer 3 is directly connected to the on-load tap changer 3, and the central 1) phase tap lead 6b is connected between the upper clamp 5 and the tank 4. The C-phase tap lead 6G that is farthest from the changeover is passed between the lower clamp 5 and the tank 4, and is connected to the load tap changer 3.
connected to.

The operation of the three-phase, nine-way time tap-change transformer of the present invention having the above-mentioned configuration is as follows.

That is, first, the tap windings 28 to 2C are composed of two layers,
By pulling out the tap leads 6a-6c of each phase only from the top and bottom of the tap winding, there is no need to connect the tap leads of each phase outside the winding and pass them between the winding and the tank. Therefore, the space between the winding and the tank can be kept to a minimum, and the tank can be made smaller.

Moreover, the tap ret drawers for each phase are C phase.

For phase B, start from the top, and for phase C, start from the bottom.
The phase tap lead 6a is directly connected, and the b-phase and C-phase tap leads 6b and 6c are connected to the on-load tap changer 3 through the connection between the upper and lower clamps 5 and the tank 4, respectively. 5) The space between the tank 4 and the tank 4 is reduced, making the tank smaller. 1. Therefore, even if the tap lead has a relatively high voltage, it is easy to create an insulation distance between the tap lead and the clamp or tank. can be secured,
Insulation reliability can be improved.

In this embodiment, the tap leads for the a and b phases are drawn out from the ``:'' part, and the tap leads for the C phase are drawn out from the bottom gap, but the present invention is not limited to this. It goes without saying that the other two phases may be drawn out from the bottom and the same effect can be obtained in that case.

[Effects of the Invention] As explained above, according to the present invention, the tap leads of each phase are drawn out from only one of the upper and lower sides of the tap winding, and the tap leads of each phase are drawn out only from one phase above and below in the direction of the pull-out knob. Due to the arrangement configuration in which the other two phases are reversed, the space between the winding and the tank can be kept to a minimum, and the tap lead can be connected between the clamp and the tank by one knot per phase. The three-phase load II allows for a smaller tank and improves insulation reliability because it takes up more wiring space!
A 1-tap switching transformer can be provided.

[Brief explanation of the drawing]

1 and 2 show a side view of a conventional 34 (1f load tap-changing transformer), and FIG. 3 iJ shows an embodiment of a three-phase load tap-changing transformer according to the present invention. It is a side view. 1... Iron core, 20~2G... Winding wire, 3... Load ■
, Shitatsubu switch, 4...Tank, 5...Clamp, 6a-6C...Tap lead. Figure 1 Figure 2 to ta

Claims (1)

[Scope of Claims] (1) The contents of a transformer in which a high voltage winding, a low voltage winding, and a tap winding are wound around each of the three core main legs, and an on-load tap changer are housed in the same tank. In a three-phase on-load tap changer, in which tap leads are drawn out from the tap windings of each phase and connected to the above-mentioned on-load tap changer by wiring them inside the tank, the tap windings The feature is that the tap lead of each phase is drawn out from only one side of the top and bottom of the tap winding, and the top and bottom of the drawing direction of the tap lead of each phase are reversed from 1 phase or 2 phase. A three-phase on-load tap-changing transformer.