JP7660337B2 - Transformers - Google Patents

Description

This technology relates to transformers.

A connecting member has been proposed in the past in which a protrusion is formed on one side of a plate-shaped crimping part, the crimping part is curved, the one side covers an aluminum electric wire, and the crimping part is crimped to the electric wire, electrically connecting the electric wire to another component. The electric wire is covered with an enamel layer, but by pressing the protrusion against it, the enamel layer is cut, enabling an electrical connection.

Patent No. 6440277

However, when an electric wire is covered with a resin coating that is thicker than the enamel layer, it is necessary to use a chemical to remove the coating beforehand in order to connect the electric wire. Only a limited number of workers are capable of handling the chemicals, and the chemicals are toxic. In addition, the coating must be immersed in the chemicals for a long time to remove them.

This disclosure has been made in light of these circumstances, and aims to provide a transformer that can safely and quickly cut off a thick coating that covers the conductor wire, thereby achieving electrical connection.

The transformer according to the present disclosure comprises an iron core, a coil wound around the iron core, a conductor connected to the coil and covered with a resin coating, and a connector for connecting the conductor, the connector having a protrusion for pressing the coating.

In this disclosure, the protrusion presses and cuts the resin coating, electrically connecting the conductor inside the coating to other components.

In the transformer disclosed herein, the connector connects the conductor to a power line that supplies electric power.

In this disclosure, a connector with protrusions is used to connect the conductor and power line, enabling quick connection work.

The transformer according to the present disclosure includes a tap changer, and the connector connects the conductor to the tap changer or a connection line from the tap changer.

In this disclosure, a connector with a protrusion is used to connect a conductor to a tap changer or a connection line from the tap changer, allowing for quick connection work.

In the transformer disclosed herein, the protrusions push and cut the resin coating, electrically connecting the conductors inside the coating to other components. This allows the connection work to be performed without using chemicals, and can be done safely and in a short time.

FIG. 2 is a simplified front view of the transformer according to the first embodiment. FIG. 4 is a schematic cross-sectional view of a power line and a coupling line, and a first connecting line and a second connecting line, which are crimped to a connecting tool. FIG. FIG. 11 is a simplified perspective view of a connector according to a second embodiment. FIG. 4 is a schematic plan view of a tap changer and a second connection line connected via a connector. 4 is a schematic cross-sectional view of a plurality of second connection lines crimped to a connection tool. FIG.

(Embodiment 1)
The present invention will be described below with reference to the drawings showing a transformer according to embodiment 1. Fig. 1 is a simplified front view of the transformer. The transformer 1 includes a rectangular ring-shaped iron core 2 and a coil 3 wound around a long side of the iron core 2. The iron core 2 protrudes from both ends of the coil 3.

A support base 4 is provided at one end of the coil 3 so as to cover the iron core 2. The support base 4 supports the tap changer 6 via a connector 5. The tap changer 6 is provided with a plurality of tap terminals 6a that pass through the tap changer 6 from top to bottom. One end of the plurality of first connection lines 11 is connected to the lower side of the tap terminals 6a. One end of the second connection line 12 is connected to the coil 3. The other ends of the first connection line 11 and the second connection line 12 are connected via a connector 9.

The coil 3 is supplied with power from an external power supply unit (not shown). The power supply unit and the coil 3 are connected via a power line 7 and a connecting line 8. One end of the power line 7 is connected to the power supply unit via a bushing 51 of the case cover 50. One end of the connecting line 8 is connected to the coil 3. The other ends of the power line 7 and the connecting line 8 are connected via a connector 9.

Figure 2 is a schematic perspective view of the connector 9. The connector 9 has a cylindrical crimping portion 9a, and multiple recesses 9b are formed on the outer circumferential surface of the crimping portion 9a. The recesses 9b are formed by a punch, and multiple protrusions 9c are formed on the opposite side of the recesses 9b, i.e., on the inner circumferential surface of the crimping portion 9a.

Figure 3 is a schematic cross-sectional view of the power line 7 and connecting line 8, as well as the first connecting line 11 and the second connecting line 12, crimped to the connector 9. The power line 7 has a conductor 7a, for example, made of copper wire, and a coating 7b that coats the conductor 7a. The connecting line 8 has a conductor 8a, for example, made of aluminum wire, and a resin coating 8b that coats the conductor 8a. The thickness of the coating 8b is, for example, about 0.3 mm to 0.8 mm. In general, the thickness of the enamel layer is 0.003 mm to 0.035 mm, and the thickness of the coating is sufficiently greater than the thickness of the enamel layer.

When the power line 7 is inserted into one end of the connector 9, the connecting wire 8 is inserted into the other end of the connector 9, and the connector 9 is crimped to the power line 7 and the connecting wire 8 using a tool, the protrusions 9c press against the periphery of the power line 7 and the connecting wire 8, and the conductors 7a, 8a break through the coatings 7b, 8b between the multiple protrusions 9c and emerge to the outside. The conductors 7a, 8a are connected to the connector 9.

The first connection wire 11 comprises a metal conductor 11a and a resin coating 11b that covers the conductor 11a. The second connection wire 12 comprises a metal conductor 12a and a resin coating 12b that covers the conductor 12a.

When the first connection line 11 is inserted into one end of the connection tool 9, the second connection line 12 is inserted into the other end of the connection tool 9, and the connection tool 9 is crimped to the first connection line 11 and the second connection line 12 using a jig, as described above, the conductor 11a of the first connection line 11 breaks through the coating 11b and connects to the connection tool 9, and the conductor 12a of the second connection line 12 breaks through the coating 12b and connects to the connection tool 9.

In the transformer according to the first embodiment, the protrusion 9c presses and cuts the resin coatings 7b, 8b, 11b, and 12b, electrically connecting the conductors 7a, 8a, 11a, and 12a in the coatings 7b, 8b, 11b, and 12b to other components. The connection work of removing the coatings 7b, 8b, 11b, and 12b can be performed without using chemicals, and the connection work can be performed safely and in a short time.

A connector 9 with a protrusion 9c is used to connect the conductor 8a and the power line 7, allowing for quick connection work. A connector 9 with a protrusion 9c is used to connect the second connection line 12 from the coil 3 and the first connection line 11 from the tap changer 6, allowing for quick connection work.

Similarly, a quick connection operation can be achieved by inserting a first connection line 11 into one end of the connection tool 9, inserting a second connection line 12 into the other end of the connection tool 9, and crimping the connection tool 9 to the first connection line 11 and the second connection line 12.

(Embodiment 2)
Hereinafter, the present invention will be described with reference to the drawings showing a transformer according to embodiment 2. Among the configurations of embodiment 2, the same configurations as those of embodiment 1 are given the same reference numerals, and detailed description thereof will be omitted. In embodiment 1, the first connection line 11 and the second connection line 12 are connected, but in embodiment 2, the first connection line 11 is not used, and the second connection line 12 is connected to the tap changer 6 via a connector 10.

Figure 4 is a schematic perspective view of the connector 10. The connector 10 is made of a soft metal material, such as a copper material or a copper alloy material. The connector 10 has a gutter-shaped crimping portion 10a and a tongue portion 10c protruding from one end of the crimping portion 10a. A plurality of protrusions 10b are formed on the inner surface of the crimping portion 10a. A through hole is formed in the tongue portion 10c.

Figure 5 is a schematic plan view of the tap changer 6 and second connection wire 12 connected via the connector 10, and Figure 6 is a schematic cross-sectional view of multiple second connection wires 12 crimped to the connector 10. A case where two second connection wires 12 are connected to a tap terminal 6a will be described. The ends of the two second connection wires 12 are placed inside the crimping portion 10a, and the two second connection wires 12 are wrapped by the crimping portion 10a using a jig, and the crimping portion 10a is crimped. The protrusions 10b press against the periphery of the second connection wire 12, and the conductor 12a breaks through the covering portion 8b between the multiple protrusions 10b and comes out to the outside. The conductor 12a is connected to the crimping portion 10a.

Then, the tongue portion 10c is connected to the underside of the tap terminal 6a. For example, a female thread (not shown) is formed at the lower end of the tap terminal 6a. The tongue portion 10c is placed under the tap terminal 6a so that the through hole 10d is arranged coaxially with the female thread, and a bolt (not shown) is inserted into the through hole 10d and connected to the bolt. The tongue portion 10c is sandwiched between the head of the bolt and the tap terminal 6a, and the tongue portion 10c is connected to the tap terminal 6a.

The tongue portion 10c and the tap terminal 6a may be connected by forming a male screw at the lower end of the tap terminal 6a, inserting the male screw into the through hole 10d, and connecting a nut to the male screw. Three or more second connection wires 12 or a single second connection wire 12 may be connected to the tap terminal 6a via the connector 10.

In the second embodiment, the tongue portion 10c of the connector 10 is directly connected to the tap terminal 6a, eliminating the need for the first connection wire 11 and enabling quick connection work.

The embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The technical features described in each embodiment can be combined with each other, and the scope of the present invention is intended to include all modifications within the scope of the claims and equivalents to the scope of the claims.

REFERENCE SIGNS LIST 1 Transformer 2 Core 3 Coil 6 Tap changer 7 Power line 8 Connecting wire 8a Conductor 8b Covering portion 9, 10 Connector 9a, 10a Crimping portion 9c, 10b Protrusion 11 First connecting wire (connecting wire) 12 Second connecting wire

Claims (3)

Iron core and
A coil wound around the iron core;
A conducting wire connected to the coil and covered with a resin coating having a thickness of 0.3 mm to 0.8 mm ;
a connector for connecting the conductor wire and having one surface ;
The connector has a plurality of protrusions on the one surface, the protrusions pressing against the covering portion and protruding in a direction intersecting the one surface , and no recesses or holes are formed on the one surface or the protrusions,
the connector is crimped to the conductor, and the conductor breaks through the coating between the protrusions and is connected to the connector. The transformer according to claim 1 , wherein the connector connects the conductor to a power line that supplies electric power. Equipped with a tap changer,
The transformer according to claim 1 , wherein the connector connects the conductor to the tap changer or a connection line from the tap changer.

Images