JPH0222968Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electromagnetic induction device in which a temperature sensing portion is provided via a fixture on a main body having a winding and an iron core.

[Technical background of the invention and its problems]

This type of electromagnetic induction equipment includes dry type transformers and dry type reactors, which issue an alarm or activate a protection circuit to prevent insulation deterioration and equipment destruction when the windings generate abnormal heat. For this reason, a temperature detection section for detecting the temperature of the winding is provided on the main body including the winding and the iron core via a fixture. The above-mentioned fixture is usually made of a metal plate and is fixed to a clamp of the iron core by welding.

However, with such conventional devices, the above-mentioned fixtures may cause corona generation when the voltage is high, and as a countermeasure to this, the position of the fixtures is moved away from the windings, which increases the temperature detection error. However, if the length of the temperature sensing part was increased to bring the temperature sensing part closer to the winding, the cost would increase. Furthermore, since the fixtures are fixed by welding, there is a problem in that it is troublesome and reduces the ease of assembly.

On the other hand, it has also been proposed to mold the temperature sensing part with an insulating material and interpose it between the high and low voltage windings.
If a dimensional error occurs between the windings due to assembly error of each winding, the dimensions of the temperature sensing part must be adjusted accordingly, and temperature sensing errors are likely to occur because there is insulating material around the temperature sensing part. There are drawbacks.

[Purpose of invention]

The present invention was developed in view of the above circumstances, and its purpose is to prevent the occurrence of corona, eliminate temperature detection errors, contribute to cost reduction, and further improve assembly ease. The purpose of the present invention is to provide an electromagnetic induction device that can be used for various purposes.

[Summary of the idea]

The present invention provides an electromagnetic induction device in which a temperature sensing portion is installed on a main body having a winding and an iron core via a fitting, in which the fitting is connected to a mounting seat portion and an insertion piece portion using an electrically insulating member. and the fitting is fixed to the main body by fitting the insertion piece part between the winding wire and the iron core, and the temperature sensing part is attached to the mounting seat part. The present invention is characterized in that it is possible to electrically insulate the fixture and the winding, and to dispose the temperature sensing portion near the winding, and the fixture can also be easily fixed.

[Example of idea]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a dry type transformer, in which 1 is a main body comprising an iron core 2 and windings 3 and 4, 5 is a tightening band for the iron core 2, and 6 is a yoke insulator. , 3a, 3b are the opening parts of the winding 3, 4
a, 4b are the opening parts of the winding 4, 7 is a spacer, 8
is a spacing piece inserted between the iron core 2 and the windings 3 and 4. Reference numeral 9 denotes a fixture, which is made of an electrically insulating material such as polyester glass mat or epoxy resin, and has a mounting seat 10 and a long insertion piece 11 that is approximately perpendicular to the mounting seat. It consists of A hole 10a for inserting a temperature sensing portion is formed in the mounting seat portion 10. This fixture 9 can be attached to the main body 1 by inserting and fitting the insertion piece 11 between the iron core 2 and the winding 3.
is fixed. In this case, the mounting seat 10 is located near the winding 3. Reference numeral 12 denotes a temperature detection section, which detects when the winding 3 generates abnormal heat and activates an alarm or a protection circuit (not shown). It is fitted and installed. In this case, since the mounting seat part 10 is located near the winding 3, even if the temperature sensing part 12 is short, it is sufficiently close to the winding 3.

According to the above configuration, since the fixture 9 is formed of an electrically insulating material, the mounting seat portion 10 of the fixture 9 is connected to the winding 3.
Since corona will not be generated from this part even if it is brought close to It's short,
Overall, temperature detection errors can be eliminated and costs can be reduced. Furthermore, in order to fix the fixture 9 to the main body 1, it is only necessary to fit the insertion piece 11 between the core 2 and the winding 3 (or 4), which improves the ease of assembly. In this case, since the insertion piece 11 has a wedge function between the iron core 2 and the winding 3 to maintain the distance between them, the number of parts and the number of assembly steps can be reduced accordingly.

Although a dry type transformer is illustrated in the above embodiment, the present invention is not limited thereto, and can also be applied to, for example, a dry type reactor.

[Effect of idea]

As is clear from the above description, the present invention relates to an electromagnetic induction device in which a temperature sensing portion is provided on a main body having a winding and an iron core via a fitting, and the fitting is attached to an electrically insulating member. The fitting is fixed to the main body by fitting the insertion piece between the winding wire and the iron core, and the attachment piece is fixed to the main body by fitting the insertion piece between the winding wire and the iron core. This device is characterized by the fact that it is equipped with a temperature detection section, which prevents the occurrence of corona in the mounting part, eliminates temperature detection errors, and reduces costs. It has various excellent effects such as improvement in the number of parts and reduction in the number of assembly steps.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a plan view and FIG. 2 being a front view. In the figure, 1 is the main body, 2 is the iron core, 3 and 4 are the windings, and 8
9 is a spacing piece, 9 is a fitting, 10 is a mounting seat, 1
1 is an insertion piece, and 12 is a temperature detection section.

Claims (1)

[Scope of utility model registration request] A temperature sensing portion is provided to a main body having a winding and an iron core via a fitting, the fitting being formed of an electrically insulating member to have a mounting seat portion and an insertion piece portion, An electromagnetic induction device, characterized in that the attachment is fixed to the main body by fitting the insertion piece between the winding and the iron core, and the temperature detection section is attached to the attachment seat.