CN212301673U

CN212301673U - Current transformer with testing function

Info

Publication number: CN212301673U
Application number: CN202020912386.4U
Authority: CN
Inventors: 陈晨; 冉乾龙; 董楼
Original assignee: Wuxi Kewei Electric Co Ltd
Current assignee: Jiangsu Exway Electric Co.,Ltd.
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2021-01-05
Anticipated expiration: 2030-05-26

Abstract

The utility model relates to an electrical equipment technical field especially relates to a self has test function's current transformer. The to-be-solved technical problem of the utility model is whether there is the broken string problem in the inconvenient verification sinle silk of current transformer, the inconvenient problem of carrying out the check-up of current transformer. In order to solve the technical problem, the utility model provides a self has test function's current transformer, including the annular cover shell, the bottom fixedly connected with rectangular shell of annular cover shell. The device is through addding the test winding on annular iron core, utilizes the test winding to carry out test operation as primary winding to current transformer, makes things convenient for electrical operating personnel to measure secondary winding and judge whether secondary winding opens circuit, and whether the sinle silk is normal, can convert current transformer's secondary winding's number of turns and various proportion parameters with test winding voltage electric current size, prevents that the data plate from losing the unclear problem of hardware parameter that leads to, has made things convenient for the use of equipment.

Description

Current transformer with testing function

Technical Field

The utility model relates to an electrical equipment technical field specifically is a self has test function's current transformer.

Background

The bus type current transformer is a low-voltage indoor bus type cast insulation and plastic shell insulation current transformer, commonly called a straight-through current transformer. The current transformer is widely applied to measurement, electric energy metering and relay protection circuits of low-voltage systems, because the current-carrying conductor can directly pass through the window hole to serve as a primary winding and the number of winding turns (turns) of the primary winding can be changed according to requirements so as to adapt to circuits with different rated currents, the current transformer is flexible and convenient to use, and because the current transformer is simple in structure, small in size and low in price, the current transformer is widely applied.

The existing feed-through current transformer needs to externally connect a primary winding on the inner side of the current transformer before use to test whether a secondary winding in the current transformer is normal or not, and the problems of short circuit and the like exist.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Not enough to prior art, the utility model provides a self has test function's current transformer has solved the inconvenient sinle silk of verifying of current transformer and has whether has the broken string problem, the inconvenient problem of carrying out the check-up of current transformer.

(II) technical scheme

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a current transformer that self has test function, includes annular cover shell, the bottom fixedly connected with rectangular shell of annular cover shell, the equal fixedly connected with installation iron sheet in the left and right sides of the bottom of rectangular shell.

The inner side of the annular casing is fixedly sleeved with an annular iron core, the surface of the annular iron core is wound with a secondary winding, two ends of the secondary winding downwards penetrate through the annular casing and extend to the inner side of the rectangular shell, the left side and the right side of the rectangular shell are fixedly connected with annular pipes, two ends of the secondary winding are fixedly connected with the two annular pipes respectively, and the inner side of each annular pipe is in threaded connection with a terminal bolt.

The LED lamp tube comprises a rectangular shell, and is characterized in that a containing cavity is formed in the inner side of the rectangular shell and communicated with the inner side of an annular shell, a test winding is movably sleeved in the containing cavity and wound on the surface of an annular iron core, an LED lamp tube is connected in series in the middle of the test winding, and the LED lamp tube is fixedly sleeved on the inner side of the containing cavity.

The testing device comprises a containing cavity, a testing winding and a conductive elastic sheet, wherein a battery case is fixedly connected to the inner side of the containing cavity, the bottom surface of the inner wall of the battery case is fixedly connected with the conductive elastic sheet, one end of the conductive elastic sheet is fixedly connected with a protection resistor, and the end, back to the conductive elastic sheet, of the protection resistor is fixedly connected with one end of the testing winding.

The top of the battery case is fixedly connected with a metal threaded pipe, the side surface of the metal threaded pipe is fixedly connected with the other end of the test winding, the inner side of the metal threaded pipe is in threaded connection with an end cover, the inner side of the end cover is fixedly connected with a conical spring, and one end of the conical spring is matched with the metal threaded pipe.

Further preferably, the number of the installation iron sheets is two, and the two installation iron sheets are respectively and fixedly connected to the left side and the right side of the bottom end of the rectangular shell.

Preferably, the ring pipe is made of a copper-plated conductive material, and threads matched with the terminal bolts are formed on the inner side of the ring pipe.

Preferably, a plastic lamp holder is fixedly connected to the inner side of the accommodating cavity, and the LED lamp tube is fixedly connected to the inner side of the plastic lamp holder.

Further preferably, the number of turns of the test winding wound on the surface of the annular iron core is five, and the line type and the wire diameter of the test winding are consistent with those of the secondary winding.

Preferably, the length of the conical spring during flattening is greater than that of the metal threaded pipe, one end of the conical spring is fixedly connected with a V-shaped elastic sheet, two ends of the V-shaped elastic sheet are respectively and fixedly connected to the inner side and the outer side of the end cover, and one end of the V-shaped elastic sheet is abutted to the surface of the metal threaded pipe.

(III) advantageous effects

The utility model provides a self has test function's current transformer possesses following beneficial effect:

(1) the device is through addding test winding on annular iron core, utilizes test winding to carry out test operation as primary winding to current transformer to cooperation battery case loads the battery and supplies power to test winding, realizes the supply of the interior magnetic field of annular iron core, makes things convenient for electrical operation personnel to measure secondary winding and connect through the secondary winding end and whether the ampere meter measurement produces the electric current and judges whether secondary winding opens circuit, whether the sinle silk is normal.

(2) The device supplies power through the test winding and supplies the mode in magnetic field, can prevent that the data plate from losing the unclear problem of hardware parameter that leads to with the number of turns and various proportion parameter of test winding voltage electric current size conversion current transformer's secondary winding, and the device is from taking the test winding simultaneously, having saved and having carried out the time of measuring the comparison through the outside access primary winding, has made things convenient for the use of equipment.

Drawings

Fig. 1 is a front view of the structure of the present invention;

FIG. 2 is a front sectional view of the structure of the present invention;

fig. 3 is a side cross-sectional view of the battery case and the secondary winding of the present invention.

In the figure: the LED lamp comprises an annular casing 1, a rectangular casing 2, an installation iron sheet 3, an annular iron core 4, a secondary winding 5, a ring pipe 6, a terminal bolt 7, an accommodating cavity 8, a test winding 9, an LED lamp tube 10, a battery shell 11, a conductive elastic sheet 12, a protective resistor 13, a metal threaded tube 14, an end cover 15 and a conical spring 16.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a self has test function's current transformer, includes annular cover shell 1, annular cover shell 1's bottom fixedly connected with rectangular shell 2, the equal fixedly connected with installation iron sheet 3 in side about rectangular shell 2's bottom, the figure of installation iron sheet 3 is two, two installation iron sheets 3 respectively fixed connection side about rectangular shell 2 bottom.

Annular cover shell 1's inboard is fixed to have cup jointed annular iron core 4, annular iron core 4's surface has been around having connect secondary winding 5, secondary winding 5's both ends are run through annular cover shell 1 downwards and are extended to rectangular shell 2's inboard, the equal fixedly connected with ring canal 6 in left and right sides of rectangular shell 2, ring canal 6 is copper-plated electrically conductive material, ring canal 6 inboard seted up with terminal bolt 7 assorted screw thread, terminal bolt 7 and ring canal 6 mainly used link to each other with the positive negative pole of external ampere meter, judge through the ampere meter after test winding 9 circular telegram whether current transformer secondary winding 5 has the problem of opening circuit, secondary winding 5's both ends respectively with two ring canal 6 fixed connection, the inboard threaded connection of ring canal 6 has terminal bolt 7.

The inboard of rectangular shell 2 has been seted up and has been accomodate chamber 8, it communicates with each other with the inboard of annular cover shell 1 to accomodate chamber 8 internalization, test winding 9 has been cup jointed to accomodate the chamber 8 internalization, test winding 9 wire-wound is on the surface of annular iron core 4, test winding 9 is five circles in the number of turns of annular iron core 4 surface wire-wound, test winding 9's the line type and the line footpath unanimous with secondary winding 5's line type and line footpath, test winding 9's middle part is established ties there is LED fluorescent tube 10, LED fluorescent tube 10 is fixed cup joints the inboard at accomodating chamber 8, accomodate the inboard fixedly connected with plastic lamp stand of chamber 8, LED fluorescent tube 10 fixed connection is in the inboard of plastic lamp stand, LED fluorescent tube 10 mainly used judges whether test winding 9 switches on or not.

The inner side of the accommodating cavity 8 is fixedly connected with a battery shell 11, the bottom surface of the inner wall of the battery shell 11 is fixedly connected with a conductive elastic sheet 12, one end of the conductive elastic sheet 12 is fixedly connected with a protective resistor 13, and the end, back to the conductive elastic sheet 12, of the protective resistor 13 is fixedly connected with one end of the test winding 9.

The top of the battery shell 11 is fixedly connected with a metal threaded pipe 14, the side surface of the metal threaded pipe 14 is fixedly connected with the other end of the test winding 9, the inner side of the metal threaded pipe 14 is in threaded connection with an end cover 15, the inner side of the end cover 15 is fixedly connected with a conical spring 16, one end of the conical spring 16 is matched with the metal threaded pipe 14, the length of the conical spring 16 in the flattening process is larger than that of the metal threaded pipe 14, one end of the conical spring 16 is fixedly connected with a V-shaped elastic sheet, two ends of the V-shaped elastic sheet are fixedly connected to the inner side and the outer side of the end cover 15 respectively, and one end of the V-shaped elastic.

The working principle is as follows: two terminal bolts 7 are respectively connected with two ends of an ammeter, a battery is assembled in a battery shell 11, the positive electrode end of the battery is abutted against and connected with a conductive elastic sheet 12, an end cover 15 and a metal threaded pipe 14 are screwed, the surface of a V-shaped elastic sheet is contacted with the metal threaded pipe 14, a test winding 9 and the battery form a closed loop along with the contact of a conical spring 16 and the negative electrode of the battery, the LED lamp tube 10 is lightened, the test winding 9 generates a magnetic field in an annular iron core 4, the ammeter indicates that a secondary winding 5 of the current transformer is normal if the ammeter deflects at the moment, and the ammeter indicates that the secondary winding 5 of the current transformer is broken and the core breaking phenomenon occurs if the ammeter does not deflect.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention.

Claims

1. The utility model provides a current transformer that self has test function, includes annular cover shell (1), its characterized in that: the bottom end of the annular casing (1) is fixedly connected with a rectangular casing (2), and the left side and the right side of the bottom end of the rectangular casing (2) are fixedly connected with installation iron sheets (3);

an annular iron core (4) is fixedly sleeved on the inner side of the annular casing (1), a secondary winding (5) is wound on the surface of the annular iron core (4), two ends of the secondary winding (5) downwards penetrate through the annular casing (1) and extend to the inner side of the rectangular shell (2), ring pipes (6) are fixedly connected to the left side and the right side of the rectangular shell (2), two ends of the secondary winding (5) are respectively and fixedly connected with the two ring pipes (6), and terminal bolts (7) are connected to the inner side of the ring pipes (6) in a threaded manner;

a containing cavity (8) is formed in the inner side of the rectangular shell (2), the containing cavity (8) is communicated with the inner side of the annular casing (1), a test winding (9) is movably sleeved in the containing cavity (8), the test winding (9) is wound on the surface of the annular iron core (4), an LED lamp tube (10) is connected in series in the middle of the test winding (9), and the LED lamp tube (10) is fixedly sleeved on the inner side of the containing cavity (8);

a battery case (11) is fixedly connected to the inner side of the accommodating cavity (8), a conductive elastic sheet (12) is fixedly connected to the bottom surface of the inner wall of the battery case (11), a protective resistor (13) is fixedly connected to one end of the conductive elastic sheet (12), and one end, opposite to the conductive elastic sheet (12), of the protective resistor (13) is fixedly connected to one end of the test winding (9);

the top of the battery shell (11) is fixedly connected with a metal threaded pipe (14), the side surface of the metal threaded pipe (14) is fixedly connected with the other end of the test winding (9), the inner side of the metal threaded pipe (14) is in threaded connection with an end cover (15), the inner side of the end cover (15) is fixedly connected with a conical spring (16), and one end of the conical spring (16) is matched with the metal threaded pipe (14).

2. The current transformer with the test function as claimed in claim 1, wherein: the number of installation iron sheet (3) is two, two installation iron sheet (3) fixed connection respectively is in the left and right sides of rectangle shell (2) bottom.

3. The current transformer with the test function as claimed in claim 1, wherein: the ring pipe (6) is made of a copper-plated conductive material, and threads matched with the terminal bolts (7) are formed in the inner side of the ring pipe (6).

4. The current transformer with the test function as claimed in claim 1, wherein: the LED lamp tube is characterized in that a plastic lamp holder is fixedly connected to the inner side of the accommodating cavity (8), and the LED lamp tube (10) is fixedly connected to the inner side of the plastic lamp holder.

5. The current transformer with the test function as claimed in claim 1, wherein: the number of turns of the test winding (9) wound on the surface of the annular iron core (4) is five, and the line type and the line diameter of the test winding (9) are consistent with those of the secondary winding (5).

6. The current transformer with the test function as claimed in claim 1, wherein: the length of the conical spring (16) in the flattening process is larger than that of the metal threaded pipe (14), one end of the conical spring (16) is fixedly connected with a V-shaped elastic sheet, two ends of the V-shaped elastic sheet are respectively and fixedly connected to the inner side and the outer side of the end cover (15), and one end of the V-shaped elastic sheet is abutted to the surface of the metal threaded pipe (14).