JPH0718427U - Mold current transformer - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to facilitate the attachment of the iron core to the mold body and to simplify the configuration for fixing the electric potential of the iron core. [Structure] The tips of a plurality of screws screwed into a mounting member are pressed against the legs of each of the split cores that are abutted in the grooves of the mold body so that the legs are pressed against the bottom surface of the groove and fixed. When the tip of the screw is pressed against the leg, the tip is electrically connected to the iron core. As a result, the iron core is connected to the fitting and the electric potential is fixed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mold current transformer, particularly to a mold current transformer having an iron core attached to the outside.

[0002]

[Prior art]

 The molded current transformer is molded with the primary conductor and the secondary winding, and the molded current transformer is already fitted with the split cores from both sides of the through window formed to penetrate the primary conductor and the secondary winding. well known. 4 and 5 show a conventional example, in which 1 is a molded body made of epoxy or the like, in which a primary conductor and a secondary winding are integrally molded (see FIG. 1). Reference numeral 2 denotes an end portion of the primary conductor which is led out of the mold body 1.

A through window 3 is formed in the molded body 1 so as to penetrate through the primary conductor and the secondary winding, and U-shaped split iron cores 4 and 5 are inserted from each side surface of the through window 2. The end of one leg of each of the split cores 4 and 5 is abutted inside the through hole 3 to form a closed magnetic circuit core 6. The other leg of each of the split cores 4 and 5 is abutted in the groove 7 formed in the lower surface of the mold body 1. Reference numeral 8 is a tightening band for integrally tightening the two split iron cores 4 and 5 thus abutted, and 9 is a fitting for the molded body 1, which is attached by a bolt 10.

In such a configuration, since it is necessary to fix the closed magnetic circuit iron core 6 to the mold body 1, conventionally, the iron core guide 11 is provided on one side surface of the groove 7, and the other side surface and the side surface of the iron core are provided. The press board 12 was press-fitted into the gap and fixed with an adhesive.

Further, it is necessary to fix the electric potential of the iron core to, for example, the earth electric potential. For that purpose, the paint on a part of the surface of the iron core is peeled off, the tip of the copper plate 13 is applied there, and the tightening band 8 is used. The copper plate 13 was fixed in close contact with it, and the other end of the copper plate 13 was inserted between the mold body 1 and the mounting bracket 9 and fastened together by bolts 10.

However, with such a configuration, the press-fitting work of the press board 12 is troublesome, and it takes about one day to dry the adhesive for bonding the press board 12. Further, in order to fix the electric potential, it is necessary to remove the paint of the iron core and attach the copper plate 13.

[0007]

[Problems to be solved by the device]

 An object of the present invention is to facilitate the attachment of the iron core to the mold body and to simplify the structure for fixing the electric potential of the iron core.

[0008]

[Means for Solving the Problems]

 According to the present invention, the inner surface of the leg is pressed against the bottom surface of the groove by pressing the tips of the screws screwed into the mounting bracket against the leg of each split iron core that abuts in the groove of the mold body. It is characterized by being fixed in.

[0009]

[Action]

 The legs of the split core are pressed against the bottom of the groove of the mold by screws, and the core is fixed to the mold. In addition, at the time of this pressing, the tip of the screw is electrically connected to the iron core by breaking through the paint of the iron core, and the screw is screwed into the mounting bracket, so the iron core and the mounting bracket are electrically connected via the screw. , The electric potential of the iron core will be fixed.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. Note that the portions denoted by the same reference numerals as in FIGS. 4 and 5 indicate the same or corresponding portions. In FIG. 1, reference numeral 15 is a primary conductor, and 16 is a secondary winding, which are molded in a state of being arranged so as to surround the through window 3. Each leg of the split iron cores 4 and 5 is inserted into the through window 3 and the groove 7 from both sides of the molded body 1, and the tips thereof are abutted and are integrally tightened by the tightening band 8. These configurations are not particularly different from the conventional example.

According to the present invention, a plurality (at least two) of screws 17, 18 are screwed in from the bottom surface side of the mounting member 9 to be fixed. By this screwing, the tips of the screws 17, 18 are pressed against the side surfaces of the legs 19, 20 in the groove 7 of the split iron cores 4, 5, and the legs 19, 20 are pressed against the bottom surface 21 of the groove 7. By this pressing, the legs 19, 20 and therefore the respective split iron cores 4, 5 are fixed to the molded body 1.

By pressing the screws 17 and 18 against the legs 19 and 20, the insulating paint of the magnetic steel plate forming the legs is pierced. Due to this piercing, the screws 17 and 18 are electrically connected to each iron core. On the other hand, since the screws 17 and 18 are fixed by being screwed into the mounting bracket 9, therefore, the mounting bracket 9 and each iron core are connected via the screws 17 and 18, and the electric potential of the iron core is fixed. .

If one of the screws 17 and 18 is in contact with the tightening band 8 and the other is in contact with the iron core, the electric potentials of both the tightening band 8 and the iron core can be fixed. Become. Further, by using a plurality of screws 17 and 18, the iron core can be securely fixed to the mold body. .

[0014]

[Effect of device]

 As described above, according to the present invention, it becomes easy to fix the iron core to the mold body and the electric potential of the iron core in the mold current transformer, and both of them can be simultaneously achieved by the screw, and therefore the This has the effect of simplifying the configuration.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a bottom view of FIG.

FIG. 4 is a front view of a conventional example.

FIG. 5 is a bottom view of FIG.

[Explanation of symbols]

 1 Molded Body 3 Through Window 4 Split Iron Core 5 Split Iron Core 6 Closed Magnetic Circuit Iron Core 7 Groove 8 Tightening Band 9 Mounting Bracket 15 Primary Conductor 16 Secondary Winding 17 Screw 18 Screw

Claims (1)

[Scope of utility model registration request] 1. A primary conductor and a secondary winding are molded,
Insert one leg of the iron core into a through window formed to penetrate the primary winding and the secondary winding in the molded body,
In the mold current transformer which inserts the other leg of the iron core into a groove formed in the mold body and fixes the mold body to a fitting, a plurality of screws are screwed into the fitting and the mold Mold current transformation in which the leg of the iron core located in the groove of the body is pressed and fixed to the bottom of the groove by pressing the tip of the screw to the extent that the insulating paint of the leg is pierced. vessel.