JP2557185Y2 - Three-phase 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 three-phase transformer which performs a series / parallel switching.

[0002]

2. Description of the Related Art Such a slide type non-voltage tap switch for series-parallel switching of a three-phase transformer has a structure in which fifteen fixed contacts 1a to 1p have a tap interval 15 and a tap interval as shown in FIG. They are arranged in a row with an interphase spacing 16 greater than 15. FIG. 5 shows upper windings 3, 5, 7 and lower windings 4,
6 and 8 show a state where they are connected in parallel. FIG. 4 shows a state in which the movable contacts 2a to 2f in FIG. 5 move to the right and the upper windings 3, 5, 7 and the lower windings 4, 6, 8 are connected in series.

[0003]

However, this conventional slide-type non-voltage tap changer for serial-parallel switching has the movable contacts 2a, 2 connected in series as shown in FIG.
c, 2e to hold three fixed contacts 1a, 1o,
Since 1p is required in addition to the twelve fixed contacts 1b to 1n connected to the windings 3, 4, 5, 6, 7, and 8, the longitudinal dimension of the slide-type non-voltage tap changer for series-parallel switching is set. However, there is a disadvantage that the size becomes large. In view of the above, the present invention allows a sliding non-voltage tap changer for series-parallel switching to be composed of 13 fixed contacts, thereby reducing the longitudinal dimension of the slide-type non-voltage tap changer for series-parallel switching. .

[0004]

In this invention, the first to thirteenth fixed contacts are arranged in a line at equal intervals.

[0005]

In the slide type non-voltage tap changer for serial / parallel switching of the present invention, the first and second fixed contacts are short-circuited by the first movable contact and the second movable contact is shorted by the second movable contact. A third movable contact is short-circuited, a third movable contact is short-circuited with the fifth and sixth fixed contacts, a fourth movable contact is short-circuited with the seventh and eighth fixed contacts, and a fifth movable contact is formed. To short-circuit the ninth and tenth fixed contacts and to short-circuit the eleventh and twelfth fixed contacts with the sixth movable contact, so that the first and second windings and the third and fourth windings and the 5 and the sixth winding can be connected in series,
From this state, the first to sixth movable contacts are integrally slid, the first and second movable contacts are short-circuited by the first movable contact, and the fourth and fifth fixed contacts are moved by the second movable contact. Short-circuit, short-circuit the sixth and seventh fixed contacts with the third movable contact, short-circuit the eighth and ninth fixed contacts with the fourth movable contact, and connect tenth and eleventh fixed contacts with the fifth movable contact To short-circuit the twelfth and thirteenth fixed contacts with the sixth movable contact so that the first and second windings, the third and fourth windings, and the fifth and sixth windings are paralleled. , And the slide type non-voltage tap switch for series-parallel switching can be constituted by 13 fixed contacts, and the longitudinal dimension of the slide-type non-voltage tap switch for series-parallel switching can be reduced.

[0006]

FIG. 2 shows an example of a slide-type voltageless tap changer for series-parallel switching of the present invention, which has two fixed contacts 1 in comparison with the conventional slide-type voltageless tap changer for series-parallel change shown in FIG. A small number of the thirteen fixed contacts 1a to 1n are all arranged in a line at the same minimum spacing required to insulate the taps. FIG. 1 is a diagram showing the connection of a series-parallel switching slide-type non-voltage tap changer of the present invention and a transformer winding.
b is connected to the upper end of the U-phase upper winding and the lower end of the W-phase lower winding, the fixed contact 1c is connected to the upper end of the U-phase lower winding, and the fixed contact 1d is connected to the lower end of the U-phase upper winding. 1e to U
The fixed contact 1f is connected to the lower end of the phase lower winding and the upper end of the V phase upper winding, and the fixed contact 1f is connected to the upper end of the V phase upper winding and the lower end of the U phase lower winding, and the fixed contact 1g is the upper end of the V phase lower winding. The fixed contact 1h is connected to the lower end of the V-phase upper winding, the fixed contact 1i is connected to the lower end of the V-phase lower winding and the upper end of the W-phase upper winding, and the fixed contact 1j is connected to the W-phase upper winding. The fixed contact 1k is connected to the upper end and the lower end of the V-phase lower winding, the fixed contact 1k is connected to the upper end of the W-phase lower winding, the fixed contact 1m is connected to the lower end of the W-phase upper winding, and the fixed contact 1n is connected to the W-phase lower winding. The fixed contact 1c and the fixed contact 1d are short-circuited by the movable contact 2b, the fixed contact 1g and the fixed contact 1h are short-circuited by the movable contact 2d, and the fixed contact 1k and the movable contact 2f are connected by the movable contact 2d. The fixed contact 1m is short-circuited and the U-phase upper winding 3 and U
The state where the lower phase winding 4 and the upper V phase winding 5 and the lower V phase winding 6 and the upper W phase winding 7 and the lower W phase winding 8 are connected in series is shown. In this case, the fixed contact 1e and the fixed contact 1i
Has a movable contact 2c and a movable contact 2e in place of the fixed contact 1e and the fixed contact 1p of the conventional slide-type non-voltage tap changer for series switching shown in FIG. At this time, the lead wire 9 and the lead wire 10 which were not connected by the conventional slide-type non-voltage tap changer for serial / parallel switching shown in FIG.
The lead wire 11 and the lead wire 12 are connected by the movable contact 2c and the movable contact 2e, but the lead wire 9 and the lead wire 10 and the lead wire 11 and the lead wire 12 are already connected by the transfer lead wire 13 and the transfer lead wire 14. There is no problem because they are at the same potential.

[0007]

According to the present invention, as described above, it is possible to obtain a slide type non-voltage tap changer for series-parallel switching which is inexpensive and has a small size in the longitudinal direction because two fixed contacts are reduced. In addition, since the space for mounting to the three-phase transformer main body is small, the entire three-phase transformer can be reduced in size.

[Brief description of the drawings]

FIG. 1 is a diagram showing a connection between a series-parallel switching slide-type non-voltage tap changer of the present invention and a transformer winding.

FIG. 2 is a diagram showing an example of a slide-type non-voltage tap changer for series-parallel switching of the present invention.

FIG. 3 is a diagram showing an example of a conventional slide-type non-voltage tap switch for series-parallel switching.

FIG. 4 is a diagram showing connection between a conventional series-parallel switching slide-type non-voltage tap changer and a transformer winding.

FIG. 5 is a diagram showing a connection between a conventional series-parallel switching slide-type no-voltage tap changer and a transformer winding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed contact 2 Movable contact 3 U-phase upper winding 4 U-phase lower winding 5 V-phase upper winding 6 V-phase lower winding 7 W-phase upper contact 8 W-phase lower winding 9 Tap lead 10 Tap lead 11 Tap lead 12 Tap lead 13 Transition lead 14 Transition lead

Claims (1)

(57) [Scope of request for utility model registration] The first to thirteenth fixed contacts are arranged at the same interval,
The second fixed contact is connected to the upper end of the U-phase upper winding and the lower end of the W-phase lower winding, and the third fixed contact is
The fourth fixed contact is connected to the lower end of the U-phase upper winding, and the fifth fixed contact is connected to the lower end of the U-phase lower winding and the upper end of the V-phase upper winding. Connecting the sixth fixed contact to the upper end of the V-phase upper winding and the lower end of the U-phase lower winding, connecting the seventh fixed contact to the upper end of the V-phase lower winding,
The eighth fixed contact is connected to the lower end of the V-phase upper winding, the ninth fixed contact is connected to the lower end of the V-phase lower winding and the upper end of the W-phase upper winding, and the tenth fixed contact is connected to the W-phase. The eleventh fixed contact is connected to the upper end of the W-phase lower winding, and the twelfth fixed contact is connected to the lower end of the W-phase upper winding. A three-phase transformer, wherein the thirteenth fixed contact is connected to the lower end of the W-phase lower winding and the upper end of the U-phase upper winding.