JPH0546964B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transformer with an on-load voltage regulator, and particularly to a transformer with an on-load voltage regulator that has an on-load voltage regulator suitable for switching large currents. .

[Conventional technology]

The conventional device is as shown in FIG.
Since the leakage impedance cannot be made sufficiently large by winding each half in the opposite direction, the secondary windings 4a and 4b are further moved to the load voltage regulator side to form current dividing windings 6a' and 6b'. Accordingly, the ratio of the regulator side secondary winding to the total windings was increased, and the number of turns was increased to increase the impedance. Additionally, since the iron core of the regulator is generally smaller than that of the main transformer, the number of turns is greater than that transferred to the regulator from the main transformer.

[Problem to be solved by the invention]

Since the conventional transformer with on-load voltage regulator is configured as described above, it is effective in terms of leakage impedance, but winding resistance increases. For example, when switching taps, the mechanical time lag between two switching switches used in parallel, such as a one-stage shift between the left and right taps, causes a circulating current flowing to the secondary winding side and the above-mentioned winding resistance. This has the disadvantage that resistance loss occurs and the switching contacts of the switching switch may be damaged by melting. And then there was this drawback.
This drawback has not been considered at all in the conventional configuration.

The present invention aims to eliminate this drawback, and its object is to provide a transformer with an on-load voltage regulator that suppresses the above-mentioned circulating current flowing to the secondary winding side.

[Means to solve the problem]

To achieve the above object, the present invention provides an excitation winding connected in parallel to the primary winding of the main transformer, and a first regulation winding connected in series to the two secondary windings of said main transformer, respectively. In the transformer with an on-load voltage regulator that has an inner iron type on-load voltage regulator that is provided with a secondary winding on the regulator side and a secondary winding on the second regulator side, the secondary winding on the first regulator side The winding is arranged offset to one end of the excitation winding in the axial direction, and the second
The regulator-side secondary winding is arranged offset to the other axial end of the excitation winding.

[Effect]

Since the transformer with on-load voltage regulator according to the present invention is configured as described above, the distance between the first regulator-side secondary winding and the second regulator-side secondary winding can be increased. , the leakage impedance, which is mostly mutual inductance, can be increased. In general, the leakage impedance IX between two windings arranged in a concentric cylindrical shape in a core type transformer is expressed as follows: where k is the constant, N is the number of turns, and δ is the distance between the two windings. As expressed by the formula ² ·δ, it increases in proportion to the distance between the two windings, but the phenomenon of the present invention described above can be equated with this example.

〔Example〕

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

FIG. 1 shows the configuration of a large-capacity transformer with an on-load voltage regulator. The main transformer TR is composed of a primary winding 3 disposed outside the iron core 1, and secondary windings 4a and 4b consisting of two parallel circuits. regulator lvr
The excitation winding 5 is connected in parallel to the primary winding 3 and placed outside the iron core 2, and the adjustment winding 5 is connected in series to the secondary windings 4a and 4b, each of which is offset to the upper and lower ends. It is composed of side secondary windings 6a, 6b and a tap winding 7 disposed outside of the secondary windings 6a, 6b.

The winding method of the regulator side secondary windings 6a and 6b is as shown in FIG.
The structure is such that winding is performed in the same direction from 1 turn t01 to 16 turns t16.

With the above structure, the regulator side secondary windings 6a, 6
Since the distance between the two parallel circuits of b can be increased, the leakage impedance is also increased, and as shown in Figure 2, which electrically illustrates the secondary winding side, two parallel circuits can be used. switch switch
Circulating current due to mechanical time lag in TAP can be suppressed.

Moreover, when this structure is compared with the conventional structure shown in FIG. 7, it is possible to reduce the proportion of the regulator side secondary windings 6a and 6b in the entire secondary winding. in general,
In the main transformer TR and the regulator LVR, iron core 1 of the main transformer TR is large, so in order to ensure the same voltage, the winding resistance will be smaller if the winding on the main transformer side has a larger proportion. It is possible to reduce the winding resistance of the next winding, thereby reducing resistance loss.

By making the regulator side secondary winding 6a have a folded structure as shown in FIG. conductor A1 to conductor A8, conductor B1 to conductor B8, the end of the winding to conductor A2 to conductor A9, conductor
By connecting the same symbols at the beginning and end of winding for conductors B2 to B9, the wiring diagram of the entire secondary winding shown in FIG. 2 can be formed. With this structure, the tap winding 7, which conventionally consisted of two pieces, can be reduced to one piece, and the circuits of independent individual switching switches TAP for the A series and B series can be configured, which is economical. Tap windings can be provided.

If each conductor S constituting the regulator side secondary windings 6a and 6b is configured with the short side facing the height direction of the winding as shown in FIG. 5, the height of the winding can be The directional dimension can be reduced and therefore each of the secondary windings can be placed closer to the ends, increasing the impedance.

In addition, as shown in FIG. 6, the regulator side secondary winding 6
If the windings a and 6b are divided into four and connected in series, the height dimension of each of the secondary windings 6a and 6b can be further shortened, resulting in an increase in impedance. Note that there are several methods of tap winding other than the above-mentioned example, and the same effects can be expected with any of the methods. Further, in this embodiment, an example of a single-phase two-winding transformer is shown, but the present invention can also be applied to a three-phase three-winding transformer or a three-phase single winding transformer.

〔Effect of the invention〕

As described above, the present invention provides a first regulator-side secondary winding that is disposed off-centered to one end of the excitation winding in the axial direction, and a second regulator-side secondary winding that Since the excitation winding is arranged offset to the other end in the axial direction, the interval between the first regulator-side secondary winding and the second regulator-side secondary winding can be increased. As a result, it is possible to increase the leakage impedance and suppress the circulating current flowing to the secondary winding side, preventing melting of the switching contacts of the tap changer, and further reducing the winding resistance. Therefore, resistance loss can be minimized, and an economical transformer with a load voltage regulator that reduces safety problems can be provided.

[Brief explanation of the drawing]

Figure 1 is a structural diagram of a transformer with on-load voltage regulator according to an embodiment of the present invention, Figure 2 is a wiring diagram of the entire secondary winding according to an embodiment of the present invention, and Figure 3 is the regulator side. 4 is a configuration diagram of the tap winding, FIG. 5 is a sectional view of the conductor, and FIG. 6 is a configuration diagram showing another embodiment of the regulator side secondary winding. FIG. 7 is a structural diagram of a conventional transformer with an on-load voltage regulator. 3...Primary winding, 4a, 4b...Secondary winding, 5
...Excitation winding, 6a, 6b...Secondary winding on the regulator side, TR...Main transformer, LVR...Inner iron type load voltage regulator.

Claims (1)

[Claims] 1. An excitation winding connected in parallel to the primary winding of the main transformer, and a first regulator-side secondary winding connected in series to the two secondary windings of the main transformer. In the transformer with an on-load voltage regulator having an inner iron type on-load voltage regulator comprising a wire and a second regulator-side secondary winding, the first regulator-side secondary winding is excited. A load characterized in that the winding is arranged offset to one end in the axial direction, and the second regulator-side secondary winding is arranged offset to the other end in the axial direction of the excitation winding. Transformer with voltage regulator. 2. In claim 1, the first regulator-side secondary winding and the second regulator-side secondary winding are arranged such that the conductors constituting them are arranged so that the short side of the cross-sectional dimension is the height of the winding. A transformer with an on-load voltage regulator, characterized in that the transformer is configured by winding the windings in the same direction. 3. In claim 1, the first regulator-side secondary winding and the second regulator-side secondary winding are divided and juxtaposed in the direction of juxtaposition with the excitation winding. A transformer with an on-load voltage regulator.