JP2567818Y2 - Phase adjustment transformer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase adjusting transformer for adjusting a voltage phase of a single-phase output from a three-phase input.

[0002]

2. Description of the Related Art FIGS. 2 and 3 show a conventional example of a phase adjusting transformer for inputting three phases and adjusting the phase of a single-phase output.
FIG. 2 is a connection diagram and a voltage vector diagram in the case of using the triangular connection. Two-phase secondary phase adjusting windings 4 are connected in series. The voltage vector output to the secondary terminal by this connection becomes like the voltage vector 5 shifted in phase angle θ, and is output from the secondary terminal. FIG. 3 is a connection diagram and a voltage vector diagram in the case of using the star connection, in which the primary windings 1 and 2 are formed in a star connection, and the reference two-phase secondary winding 3 is connected to another one-phase secondary The phase adjustment windings 4 are connected in series. In this case, in order to maintain the balance of the magnetic field, a stable winding 6 in which each phase is triangularly connected is required. With this connection, the reference two-phase line voltage vector 7 becomes like the voltage vector 5 shifted in phase angle θ, and is output from the secondary terminal.

[0003]

The three single-phase transformers are required in either the case where the triangular connection shown in FIG. 2 is used or the case where the star connection shown in FIG. 3 is used. For this reason, the winding capacity becomes large as a phase adjustment transformer,
Since the weight and volume are large, a large installation space is required. In addition, the cost of materials such as electric wires was large and uneconomical. Therefore, in the present invention, the phase adjustment transformer is connected so that the winding capacity is reduced.

[0004]

According to the present invention, two transformers are used, and a three-phase winding of one transformer (hereinafter, referred to as an A transformer) has 100% of the input circuit voltage. Can be applied, and a lead is provided at a position corresponding to 50% of the
The three-phase winding of two transformers (hereinafter referred to as B transformer) can apply で き 3/2 of the input circuit voltage, and the three-phase connection of the two transformers is 50% of the A transformer. And one end of the three-phase winding of the B transformer are connected, and the other end of the B transformer and both ends of the A transformer are connected to a three-phase power supply. In addition, the single-phase side winding is provided with a plurality of leads according to the required phase angle,
On the single-phase side, one end of the A transformer and one lead of the B transformer are connected so that a part or all of the windings of both the A and B transformers are connected in series, and the other end of the B transformer is connected. A single phase on the input side and a phase on the output side are converted by using one of the output or one end and the other end of the A transformer as an output end.

[0005]

The phase adjuster constructed by using the connection according to the present invention has a small winding capacity, so that the weight and volume are reduced, and the installation space can be reduced. In addition, the material cost can be reduced, so that it is economical.

[0006]

1 shows an embodiment of the present invention, and is a connection diagram of two transformers for adjusting the phase of a single-phase output from a three-phase input. On the three-phase input side, the primary winding 1 of the A transformer 9 and the primary winding 2 of the B transformer 10 are connected in the same manner as the conventional Scott connection. That is, 100% of the input circuit voltage can be applied.
A 50% intermediate lead 11 of the primary winding 1 of the A transformer is connected to one end of a primary winding 2 of the B transformer having a winding corresponding to 86.6% of the input circuit voltage. Then, the other end of the primary winding 2 of the B transformer and both ends of the primary winding 1 of the A transformer are connected to the three-phase power supply 8. The single-phase output side is connected in series to the secondary winding 3 of the A transformer as a reference, and part or all of the secondary phase adjusting winding 4 of the B transformer, the voltage vector of which is perpendicular to the secondary winding 3. , The phase can be adjusted. In the connection, a plurality of leads are provided on the secondary phase adjusting winding 4 of the B transformer according to a required phase angle,
One of the leads 12 is connected to one end of the secondary winding 3 of the A transformer. Then, one of the remaining lead 13 or one end of the secondary phase adjusting winding 4 of the B transformer and one end of the secondary winding 3 of the A transformer are set as output terminals.

[0007]

[Effect of the invention] Weight and size as a phase adjustment transformer
Since the material cost depends on the winding capacity, the effect of the present invention is shown by comparing the winding capacity with the conventional product. The voltage of the three-phase input and the single-phase output is V, and the current is I. Also,
The maximum value of the phase adjustment angle is defined as θ, and the comparison between the conventional product and the winding capacity of the present invention is shown below. First, the winding capacity of the present invention is obtained from the sum of the capacities of the respective parts in FIG.
The winding capacity of each part is as follows: Secondary winding 3: VI (1) Secondary winding 4: VItan θ (2) Primary winding 2: VItan θ (3) Primary winding 1: VI√ (1 + tan ² θ / 3) (4), and the total winding capacity from the sum of (1) to (4) is P ₁ = VI (1 + ² tan θ + √ (1 tan ² θ / 3) · (5) Next, among the conventional products, the winding capacitance of the one using the triangular connection is obtained from the sum of the capacitances of the respective parts in FIG. , Secondary winding 3: VI × 2 (6) primary winding 2, secondary winding 4: VItanθ × 4 (7), and the total is obtained from the sum of (6) and (7). the winding capacity, is expressed by _{P 2 = VI (2 + 4tanθ} ) ··· (8). Further, the winding capacity despite using a star connection of the conventional products, put 3 (9) Secondary winding 3: VItan θ (10) Secondary winding 3: VI / √3 × 2 = 2 VI / √3 (9) Secondary winding 4: VItan θ (10) Stable winding 6: VItan θ / 3 × 3 = VItan θ (11) Primary winding 1: 2 VItan θ / 3 (12) Primary winding 2: VI / {3 × √ (1 + tan ² θ / 3) ) × 2 = 2 VI / √3 × √ (1 + tan ² θ / 3) (13), and the total winding capacity is obtained from the sum of (9) to (14) as P ₃ = VI (2 / √3 + 8tan θ / 3 + 2 / √3 × √ (1 + tan ² θ / 3)) (14) Here, as an example, the maximum value θ of the phase adjustment angle
= 30 °, the winding capacity of each type is the winding capacity P _{1 of the present invention} = 3.21 VI, and the winding capacity of triangular connection P ₂ =
(1.34 times the P ₁₎ 4.31VI, which is a star-connected winding capacity P ₃ = 3.75VI (1.17 fold P1). As described above, when the transformer capacities are the same, the winding capacity can be reduced by connecting as in the present invention.
Therefore, the weight, size, and material cost are all smaller than before, so that space can be saved and the cost is reduced.

[Brief description of the drawings]

FIG. 1 is a connection diagram showing an embodiment of the present invention.

FIG. 2 is a connection diagram of a conventional phase adjustment transformer.

FIG. 3 is a connection diagram of a conventional phase adjustment transformer.

[Description of Signs] 1 Primary winding (of reference phase) 2 Primary winding 3 Secondary winding 4 Secondary phase adjustment winding 5 Voltage vector (shifted in phase angle θ) 6 Stable winding 7 Line-to-line Voltage vector 8 Three-phase power supply 9 A transformer 10 B transformer 11 Intermediate tap 12 One of taps 13 Remaining taps

Claims (1)

(57) [Scope of request for utility model registration] In a combination of transformers that input three phases and output a single phase, a three-phase winding of one transformer (hereinafter, referred to as an A transformer) constituted by two transformers is an input. 100% of the circuit voltage can be applied, and a lead is provided at a position corresponding to 50% of the circuit voltage. The three-phase winding of another transformer (hereinafter referred to as a B transformer) is √3 / 2 of the input circuit voltage And the connection on the three-phase side of the two transformers is 50 A of the A transformer.
% And one end of the three-phase winding of the B transformer are connected,
The other end of the B transformer and both ends of the A transformer are connected to a three-phase power source. The single-phase winding is provided with a plurality of leads according to the required phase angle. One end of the A transformer is connected to one end of the B transformer so that a part or all of the windings of the transformer are connected in series, and the other end of the B transformer is connected to either end. A phase adjustment transformer characterized in that a single phase on the input side and a phase on the output side are converted by using one and the other end of the A transformer as output ends.