JPS5979513A - Transformer with tap-winding - Google Patents

Abstract

PURPOSE:To obtain a highly reliable transformer by a method wherein when a transformer with a tap-winding is manufactured by winding a low voltage winding, a high voltage winding and a tap-winding successively around a main leg of a transformer core, an insulation cylinder which is to be a winding core of the tap winding is provided between the high voltage winding and the tap-winding and an insulated conductor is wound on the cylinder and one end of the insulated conductor is grounded and another end is opened. CONSTITUTION:A transformer with a tap-winding is manufactured by winding a low voltage winding, a high voltage winding and a tap-winding 9 successively around a main leg of a transformer core. In this composition, an insulation cylinder 10, which is to be a winding core of the tap-winding 9, is provided between the high voltage winding and the tap-winding 9 and on the outside of the cylinder 10 a conductor 12 covered by an insulation 11 is wound. After that one end of the conductor 12 is grounded directly or through an end static shield 13 provided above the tap-winding 9 and another end of the conductor 12 is insulated and fixed to the insulation cylinder 10 or drawn out of the winding. With this constitution, the insulation characteristics of the transformer are stabilized.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to transformers, particularly transformers with tap windings.

[Technical background of the invention and its problems]

In order to provide the transformer with a d-voltage adjustment function, as shown in Figure 1, a low voltage winding 2 and a high voltage winding 3 are arranged concentrically on the main leg 1 of the core, and a plurality of fixed taps are installed around the outer circumference of the winding 2 and the high voltage winding 3. There is a tap winding 1 inch transformation 1 steep winding arrangement in which a tap winding 4 having a welder 7 is wound. Note that 6 is a changeover switch, and 8 is a movable contact.

In a transformer with a tap winding as described above, when the tap of the tap winding 4 is changed, the static voltage formed by the high voltage winding 3 and the tap winding 4 increases to a voltage equivalent to one tap of the tap winding 4. Due to the static transfer voltage formed between the d meter, the tap winding 4, and the transformer tank body or core side leg, the static transfer pressure from the high voltage winding 3 is increased by the static voltage between each winding. Since the partial pressure is superimposed on the tap deflection pressure of the tap winding 4, a d pressure greater than the resistance of the Tarapuri exchanger is added. Therefore, in P'lh for such a transformer with tap winding,
A shield 5 is arranged between the high voltage winding 3 and the tap winding 40 as shown in FIG.
The total superposition of the static transition d pressure is reduced. The shield 5C is made of metal or other four-direction member that does not constitute a one-turn circulation circuit. However, since the shield does not constitute a circulation circuit of 5 shields and 1 turn, and must be arranged concentrically, 4t and q are required, so there was the following entry point.

(11. Eddy current loss will occur if it is wound with a single round metal plate, so after winding it with a narrow tape-shaped metal plate, it is cut in the axial direction so as not to form one turn. Workability is difficult, such as arranging another metal plate in the axial direction and fixing the potential of the entire shield 5.

(2) Since the tape-shaped metal faces the high-voltage winding, there are insulation problems such as partial abandonment or destruction when increasing the voltage and making the tape more compact.

(3) Due to the drying process of the transformer windings, shrinkage of the one-color edge material may create an oil gap between the shield and the insulator, and shrinkage of the insulator may cause deformation and strain in the shield. There is.

(4) - It is difficult to insulate the axial end.

Therefore, in order to cover the various points mentioned above, we have increased the number of manufacturing steps.

Design KJ? However, due to the instability of the insulation, we were forced to design an excessively high level of insulation.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to provide a one-bay shield that is easy to manufacture and has a stable 1.8-degree angle. The object of the present invention is to provide a highly reliable tap winding transformer.

[Summary of the invention]

In order to achieve all of the above objects, the present invention provides a one-size tap winding in which a transformer main body, in which a low-voltage winding, a high-voltage winding, and a tap winding are sequentially wound around the main leg of a transformer core, is housed in a tank. In transformers 1. An insulating cylinder serving as the winding core of the tap winding is provided between the Soukkisho winding and the tap winding, and one end of the conductor is wound on the barrel cylinder, and one end of the conductor is grounded. However, the other end is left open. In a tap winding with a static shield, one end of the conductor is connected to this static shield and grounded, and in a tap winding without a static shield, it is drawn directly outside the winding and grounded. be.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is an enlarged top view of the tap winding and shield portion according to the present invention. In the figure, a low-voltage winding and a high-voltage winding are all wound concentrically around the main leg of an iron core (not shown), and a conductor coated with an insulator 11 is placed on an insulating cylinder 10 that serves as the winding core of a tap winding 9 on the outside. 12 is spirally wound at regular intervals, and one end of this conductor 12 is connected to the static d shield 13 at the end of the tap winding 9, so that both buttons are grounded. On the other hand, the other end of the conductor 12 is either insulated and fixed to the insulating tube 10, or drawn out from the winding.

In the above embodiment, the case where an electrostatic shield is provided on the tap winding has been explained, but in the case of a tap winding without a static shield, it is possible to pull it out directly to the outside of the winding and ground it. It is sufficient to do so at either the upper or lower end. In addition, as for conductors, such as rectangular copper wires or transposed cables, if the insulation coating is completely removed on the surface, the conductor is used for the first time.

〔Effect of the invention〕

Since the tap winding transformer of the present invention has the winding configuration as described above, the tap winding is subjected to static 1 transition from the high voltage winding due to the grounded conductor. . Therefore, excessive pressure is not applied to the tap changer, and the conductor can be wound at regular intervals on the rim tube.
Since it only requires 11 nights, it can be made easily. On the other hand, at one end of the open conductor, 4 voltages corresponding to the number of turns are generated, but if the number of turns is about 10 turns, the voltage is at most several KV, and the insulation treatment is 4 It's easy. Furthermore, if the interval between each winding is about j or less than the distance from the first and upper windings, there will be a sufficient shielding effect.
Moreover, the number of turns does not increase. In addition, since the conductor has a good insulation coverage, even if it is subjected to drying treatment or mechanical force such as 1"η1 law, there will be no oil gap in the conductor. It is also possible to completely reduce the edge strength and provide a stable insulation groove.

[Brief explanation of the drawing]

FIG. 1 is a winding layout diagram of a conventional tap switching device under load, and FIG. 2 is an enlarged sectional view of a tap nursing and shielding portion according to an embodiment of the present invention. 1 Iron core main leg 2 -Low voltage winding 3I wound king winding 4,9 Tap winding 5.13
Shield 6 Changeover switch 7 Tap contact f-8 movable single contact 10, i8 edge cylinder 11 Insulator 124 bodies

Claims (2)

[Claims] (1) In a transformer with tap winding, in which a transformer main body in which a low voltage winding, a high voltage winding, and a tap winding are sequentially wound around a main leg of a transformer core is housed in a tank, the high voltage winding and the An insulating cylinder serving as a winding core of the tap winding is provided between the tap windings,
A transformer with tap winding characterized in that an insulated conductor is wound around the insulating cylinder, one end of the conductor is grounded, and the other end is left open. (2) The transformer with a tap winding according to claim 1, wherein one end of the conductor is connected to an end electrostatic shield of the tap winding and grounded.