CN210925735U

CN210925735U - Low-voltage bus type open-close current transformer

Info

Publication number: CN210925735U
Application number: CN201922194698.6U
Authority: CN
Inventors: 赵光景
Original assignee: Nanchang Shunjing Technology Co ltd
Current assignee: Nanchang Shunjing Technology Co ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-07-03
Anticipated expiration: 2029-12-10

Abstract

The utility model discloses a low-voltage bus type open-close type current transformer in the technical field of electrical equipment, which comprises a box body, a base and an mutual inductance device, wherein the top of the box body is provided with a connecting seat through a bolt, the bottom of the connecting seat is provided with two connecting blocks, the two connecting blocks are symmetrically distributed along the central axis of the box body, the box body comprises a lower shell and an upper shell, the lower shell is connected with the upper shell through a bolt, the bottom of the lower shell is provided with a plurality of first through holes, and the top of the upper shell is provided with a plurality of second through holes corresponding to the positions of the first through holes; this low voltage bus type open-close type current transformer's setting, structural design is reasonable, installs iron core and coil in the inside of box, and the coil uses the enameled wire, and both use mutually in coordination can effectual improvement circuit the magnetic permeability with avoid taking place the emergence of electric leakage accident to improvement current transformer's availability factor by a wide margin.

Description

Low-voltage bus type open-close current transformer

Technical Field

The utility model relates to the technical field of electrical equipment, specifically be a low voltage bus type open-close type current transformer.

Background

The current transformer is an instrument for measuring by converting a large primary side current into a small secondary side current according to the electromagnetic induction principle. The current transformer is composed of a closed iron core and a winding. The primary side winding of the transformer has few turns and is connected in a circuit of the current to be measured. Therefore, all current of a line always flows through the current transformer, the number of turns of the secondary side winding is large, the secondary side winding is connected in series in the measuring instrument and the protection loop, and the secondary side loop of the current transformer is always closed when the current transformer works, so that the impedance of the series coil of the measuring instrument and the protection loop is small, and the working state of the current transformer is close to a short circuit. The current transformer converts a large current on the primary side into a small current on the secondary side for measurement, and the secondary side can not be opened. The existing current sensor has a serious problem that the magnetic permeability and the insulativity are low when the current sensor is used, so that the use efficiency of the current sensor is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a low pressure generating line type open-close type current transformer to magnetic permeability and insulating nature are lower when solving the current sensor that proposes in the above-mentioned background art and using, thereby can influence current sensor's availability factor's problem.

In order to achieve the above object, the utility model provides a following technical scheme: a low-voltage bus type open-close current transformer comprises a box body, a base and a mutual inductance device, wherein a connecting seat is installed at the top of the box body through bolts, two connecting blocks are installed at the bottom of the connecting seat and symmetrically distributed along the central axis of the box body, the box body comprises a lower shell and an upper shell, the lower shell is connected with the upper shell through bolts, a plurality of first through holes are formed in the bottom of the lower shell, a plurality of second through holes corresponding to the first through holes are formed in the top of the upper shell, a plurality of rubber blocks are inserted in the top of the upper shell, the base is connected with the box body through the connecting blocks, the mutual inductance device is installed at the bottom of an inner cavity of the lower shell and comprises two coils and an iron core, the iron core is of an annular structure, and the two coils are wound on the outer wall of the iron core, and the coils are symmetrically arranged on the iron core and are electrically connected with the connecting seat.

Preferably, the hinge is passed through at the top of connecting seat and is installed the flip board, binding post is installed through the bolt in the bottom of connecting seat inner chamber, there are three joints at binding post's top.

Preferably, two installation seats are installed at the bottom of the lower shell, the two installation seats correspond to the two coil positions, and the coil is installed in the installation seats.

Preferably, two springs are respectively installed at the top and the bottom of the inner cavity of the lower shell through bolts, and the other ends of the springs are in contact with the iron core.

Preferably, the top of the base is provided with a clamping groove, and the base is inserted into the connecting block through the clamping groove.

Preferably, the bottom of the rubber block is in contact with the top of the coil.

Compared with the prior art, the beneficial effects of the utility model are that: this low voltage bus type open-close type current transformer's setting, structural design is reasonable, installs iron core and coil in the inside of box, and the coil uses the enameled wire, and both use mutually in coordination can effectual improvement circuit the magnetic permeability with avoid taking place the emergence of electric leakage accident to improvement current transformer's availability factor by a wide margin.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the internal structure of the lower casing of the present invention;

fig. 3 is a schematic view of the upper housing structure of the present invention.

In the figure: the magnetic switch comprises a box body 100, a connecting seat 110, a flip plate 111, a connecting terminal 112, a connecting block 120, a lower shell 130, a spring 131, a mounting seat 132, a first through hole 133, an upper shell 140, a rubber block 141, a second through hole 142, a base 200, a mutual inductance device 300, a coil 310 and an iron core 320.

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.

The utility model provides a low voltage bus type open-close type current transformer for the magnetic permeability of improvement circuit with avoid taking place the emergence of electric leakage accident, thereby improvement current transformer's availability factor by a wide margin please refer to and see figure 1-3, including box 100, base 200 and mutual induction device 300.

Referring to fig. 1-3, the top of the box 100 is installed with a connecting seat 110 by bolts, the top of the lower housing 130 is opened with four first screw grooves, the bottom of the lower housing 110 is opened with four second screw grooves corresponding to the first screw grooves, the lower housing 110 is connected with the lower housing 130 by the first screw grooves, the second screw grooves and screws, the bottom of the connecting seat is installed with two connecting blocks 120, the two connecting blocks 120 are symmetrically distributed along the central axis of the box 100, the box 100 comprises a lower housing 130 and an upper housing 140, the lower housing 130 is connected with the upper housing 140 by bolts, the bottom of the lower housing 130 is opened with a plurality of first through holes 133, the top of the upper housing 140 is opened with a plurality of second through holes 142 corresponding to the first through holes 133, the top of the upper housing 140 is inserted with a plurality of rubber blocks 141, the box 100 is used for installing a transformer 300, the lower housing 110 is used for communicating the transformer 300 with an external power supply, the connection block 120 is used to connect the base 200 with the case 100.

Referring to fig. 1, the base 200 is connected to the box 100 through the connecting block 120, and the base 200 is used to fix the position of the box 100.

Referring to fig. 2 again, the mutual inductance device 300 is installed at the bottom of the inner cavity of the lower housing 130, the mutual inductance device 300 includes two coils 310 and an iron core 320, the iron core 320 is a ring structure, the two coils 310 are wound around the outer wall of the iron core 320, the coils 310 are symmetrically installed on the iron core 320, the coils 310 are electrically connected with the connecting base 110, and the coils 310 and the iron core 320 in the mutual inductance device 300 are used for generating electromagnetic mutual inductance.

Referring to fig. 1-2 again, in order to facilitate connection with an external power source, the top of the connecting base 110 is provided with a flip plate 111 through a hinge, the bottom of the inner cavity of the connecting base 110 is provided with a connecting terminal 112 through a bolt, the bottom of the inner cavity of the connecting base 110 is provided with four third threaded grooves, the bottom of the connecting terminal 112 is provided with four fourth threaded grooves corresponding to the third threaded grooves, the connecting terminal 112 is connected with the connecting base 100 through the third threaded grooves, the fourth threaded grooves and a screw, the top of the connecting terminal 112 is provided with three connectors, and the connecting terminal 112 is used for connection with the external power source.

Referring to fig. 1 again, in order to improve the stability of the connection, two mounting seats 132 are installed at the bottom of the lower housing 130, the two mounting seats 132 correspond to the two coils 310, and the coils 310 are installed in the mounting seats 132, and the mounting seats 132 are used for clamping and fastening the coils 310.

Referring to fig. 2 again, in order to prevent the iron core 320 from colliding with the inner sidewall of the lower housing 130, two springs 131 are respectively installed at the top and bottom of the inner cavity of the lower housing 130 through bolts, and the other ends of the springs 131 contact with the iron core 320.

Referring to fig. 1 again, in order to improve the stability of the installation of the base 200, a slot is formed at the top of the base 200, the base 200 is inserted into the connecting block 120 through the slot, and the connecting block 120 is used to firmly install the base 200 at the bottom of the box 100.

Referring to fig. 2-3 again, in order to fix the coil 310, the bottom of the rubber block 141 contacts the top of the coil 310, and the rubber block 141 is used to compress the coil 310.

The first thread groove, the second thread groove, the third thread groove, the fourth thread groove, the connection block 120, the spring 131, and the rubber block 141 are not limited to the specific number described in this embodiment, and those skilled in the art may increase or decrease the number of the first thread groove, the second thread groove, the third thread groove, the fourth thread groove, the connection block 120, the spring 131, and the rubber block 141 as needed on the premise that the device can improve the use efficiency of the current transformer.

The working principle is that a primary winding of an open current transformer is connected in series in a measured line, a power supply is connected with a connecting terminal 112 in a connecting seat 110, so that current passes through two coils 310, both coils 310 generate electromagnetism, I1 is line current, namely primary current of the current transformer, N1 is primary turn number of the current transformer, I2 is secondary current of the current transformer, N2 is secondary turn number of the current transformer, Z2e is secondary loop equipment and connecting wire impedance, when the primary current flows in from a P1 end of the current transformer and flows out from a P2 end, under the condition that a secondary Z2e is connected, the current I2 flows through S1 through the secondary winding of the current transformer by the electromagnetic induction principle, a closed loop is formed through Z2e to S2, therefore, the I1 × N1N 2 × N2 can be obtained under an ideal condition, I1/I2N 1/N2 is obtained, the turn number of the current transformer is larger than the turn number of the open current, the performance of the iron core of the current transformer is further reduced, and the sectional area of the iron core of the current transformer is further increased.

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the various features of the disclosed embodiments of the present invention can be used in any combination with each other, and the description of such combinations is not exhaustive in the present specification only for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The utility model provides a low pressure generating line type open-close type current transformer which characterized in that: the transformer comprises a box body (100), a base (200) and a mutual inductance device (300), wherein a connecting seat (110) is installed at the top of the box body (100) through bolts, two connecting blocks (120) are installed at the bottom of the connecting seat, the two connecting blocks (120) are symmetrically distributed along the central axis of the box body (100), the box body (100) comprises a lower shell (130) and an upper shell (140), the lower shell (130) is connected with the upper shell (140) through bolts, a plurality of first through holes (133) are formed in the bottom of the lower shell (130), a plurality of second through holes (142) corresponding to the first through holes (133) are formed in the top of the upper shell (140), a plurality of rubber blocks (141) are inserted into the top of the upper shell (140), the base (200) is connected with the box body (100) through the connecting blocks (120), and the mutual inductance device (300) is installed at the bottom of an inner cavity of the lower shell (130), the mutual inductance device (300) comprises two coils (310) and an iron core (320), wherein the iron core (320) is of an annular structure, the two coils (310) are wound on the outer wall of the iron core (320), the coils (310) are symmetrically arranged on the iron core (320), and the coils (310) are electrically connected with the connecting seat (110).

2. The low-voltage bus type open-close type current transformer according to claim 1, characterized in that: the hinge-mounted type connecting device is characterized in that a turnover plate (111) is mounted at the top of the connecting base (110) through a hinge, a wiring terminal (112) is mounted at the bottom of an inner cavity of the connecting base (110) through a bolt, and three joints are arranged at the top of the wiring terminal (112).

3. The low-voltage bus type open-close type current transformer according to claim 1, characterized in that: two installation seats (132) are installed at the bottom of the lower shell (130), the two installation seats (132) correspond to the two coils (310) in position, and the coils (310) are installed in the installation seats (132).

4. The low-voltage bus type open-close type current transformer according to claim 1, characterized in that: two springs (131) are respectively installed at the top and the bottom of the inner cavity of the lower shell (130) through bolts, and the other ends of the springs (131) are in contact with the iron core (320).

5. The low-voltage bus type open-close type current transformer according to claim 1, characterized in that: the top of the base (200) is provided with a clamping groove, and the base (200) is inserted into the connecting block (120) through the clamping groove.

6. The low-voltage bus type open-close type current transformer according to claim 1, characterized in that: the bottom of the rubber block (141) is in contact with the top of the coil (310).