JPS6218017A - Transformer with voltage controller - Google Patents

Abstract

PURPOSE:To reduce the generation of core loss in no use of the voltage controller by a method wherein a switch opening when the tap selector comes to the position of the intermediate tap is provided on the connecting wire that connects the low- voltage winding of the transformer main body with the exciting winding of the voltage controller. CONSTITUTION:This single-phase transformer is constituted of a transformer main body 1 and a voltage controller 8 in a way that a low-voltage winding 2 and an exciting winding 9 are connected in parallel to each other with connecting wires 11 and 12 and the neutral point side terminal 7 of a high-voltage winding 3 and the terminal 13 of a tap winding 10 are connected in series to each other with a connecting wire 14. The tap winding 10 of the voltage controller 8 is provided with taps 15 for voltage change-over and is provided with a tap selector 16 which selects and connects the taps 15. Moreover, a switch 19 is provided on the side of at least one of the connecting wires 11 and 12 that connect the low-voltage winding 2 with the exciting winding 9, such as the connecting wire 12. When the tap selector 16 comes to the position of an intermediate tap 17, the switch 19 is opened by an electrical or mechanical means. By this constitution, the core of the low-voltage winding 2 is not excited and a reduction in core loss can be contrived at the position of the intermediate tap 17 of a high use-frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a transformer with a voltage regulator that can reduce no-load loss at an intermediate tap position by 1%.

[Background of the invention]

Large-capacity single-phase transformers installed in power plants and substations include
As disclosed in Japanese Unexamined Patent Publication No. 51-85424, a voltage regulator has been proposed in which the voltage regulator is configured in advance to have a large capacity, and when the capacity is increased, only the transformer itself needs to be added. ing. According to this proposal, the capacity can be increased easily, but since the excitation winding provided in the voltage regulator is always connected in parallel with the low voltage winding of the transformer body, 'l! Even at the intermediate tap position where the pressure regulator is not used, the iron core around which the excitation winding is wound is always excited. Therefore, there was a problem in that iron loss occurred.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a transformer with a voltage regulator that can reduce iron loss when the voltage regulator is not in use. It is on offer.

[Summary of the invention]

The present invention includes a transformer body having an iron core wound with a low voltage winding and a high voltage winding, and an excitation winding connected in parallel to the low voltage winding and connected in series to a neutral point side terminal of the high voltage winding. In a transformer with a voltage regulator, the voltage regulator is configured with a voltage regulator having an iron core wound with tap windings that adjust the voltage by a tap changer, and all of the tap windings provided in the voltage regulator. is not used in tap positions.

By providing a switch that opens the circuit of the excitation winding,
It was designed to achieve the intended purpose.

[Embodiments of the invention]

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the transformer with voltage regulator according to the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The transformer main body 1 includes a low voltage winding 2 and a high voltage winding 3 wound around an iron core (not shown). A low voltage terminal 4.5 is drawn out from the low voltage winding 2, and a line side terminal 6 and a neutral point side terminal 7 are drawn out from the high voltage winding 3. The high voltage regulator 8 is composed of an excitation winding 9 and a tap winding 10 wound around an iron core (not shown).

These transformer main body 1 and voltage regulator 2 are constructed by connecting the low voltage winding 2 and excitation winding 9 in parallel through connection wires 11 and 12, and connecting the neutral point side terminal 7 of the high voltage winding 3 with the Tap roll? 810
A single-phase transformer is constructed by connecting the two terminals 13 in series with the connecting wire 14. These connecting lines 11.1
2 and 14 use, for example, well-known oil ducts to facilitate connection work and insulation. The tap winding 10 of the voltage regulator 2 has a plurality of taps for voltage switching.

17 is an intermediate tap when the tap winding 10 is not in use, and 18 is a polarity switch for switching the polarity of the tap winding 10.

Also, a connecting wire 1 connecting the low voltage winding 2 and the excitation winding 9
1. At least one of 12, for example connection line 1
A switch 19 is provided on the second side, and when the tap selector 16 reaches the position of the intermediate tap 17, the switch 19 is opened by known electrical or mechanical means. It is configured.

The operation of this embodiment configured as described above will be explained below. Tap selector 16 is intermediate tap 17
When the tap winding 10 reaches the position , the switch 19 automatically opens, the connection between the low voltage winding 2 and the excitation winding 9 is cut off, and the low voltage winding The core of line 2 is no longer energized. This makes it possible to reduce core loss at the frequently used intermediate tap 17, resulting in an energy-saving effect.

According to this embodiment, for example, 500KV, 1000KVA
In a transformer, the total iron loss is approximately 15 inches.

In other words, it is approximately 50KW, and exhibits a large energy saving effect.

In the above-mentioned embodiment, the case of a single-phase polarity switching type transformer has been described, but the present invention can also be applied to a three-phase, single-turn type transformer, or any other switching type, and the same effects can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, a low voltage winding provided in a transformer body of a transformer with a voltage regulator.

A voltage regulator is not used because the connection wire that connects the excitation winding installed in the voltage regulator is equipped with a switch that opens when the tap selector reaches the intermediate tap position. It is possible to reduce the occurrence of iron loss when

[Brief explanation of the drawing]

FIG. 1 is a connection configuration diagram showing an embodiment of a transformer with a voltage regulator according to the present invention. DESCRIPTION OF SYMBOLS 1... Transformer body, 2... Low voltage winding, 3... High voltage winding, 7... Neutral side terminal, 8... Voltage regulator, 9...
...Excitation winding. 10...Tap winding, 16...Tap selector, 17
...Intermediate tap, 19...Switch.

Claims (1)

[Claims] 1. A transformer body having an iron core wound with a low-voltage winding and a high-voltage winding, and an excitation winding connected in parallel to the low-voltage winding and a terminal on the neutral point side of the high-voltage winding connected in series. In a transformer with a voltage regulator, the transformer includes a voltage regulator having an iron core wound with a tap winding that adjusts the voltage by a tap selector, and wherein all of the tap windings provided in the voltage regulator are At unused intermediate tap positions,
A transformer with a voltage regulator, characterized in that a switch is provided to open a circuit of the excitation winding.