CN114203425A

CN114203425A - Low-voltage DC-resistant current transformer

Info

Publication number: CN114203425A
Application number: CN202010976918.5A
Authority: CN
Inventors: 高金川
Original assignee: Renqiu Great Wall Transformer Co ltd
Current assignee: Renqiu Great Wall Transformer Co ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2022-03-18

Abstract

The invention discloses a low-voltage DC-resistant current transformer, which comprises a current transformer body and a sliding shell movably connected to the bottom of the current transformer body; the shell bottom is connected a slip shell, follows current transformer body direction cross in the slip shell have one supply the fixed part of slip shell horizontal slip, fixed part include lower rack, support bar and at least one with the gear that lower rack meshing is connected. According to the invention, the fixing part is directly installed in the electric box, so that the current transformer body is fixed in the electric box, the sliding shell slides left and right at the moment, so that the gear is driven to slide left and right relative to the fixing part, and the position of the current transformer body is further adjusted, so that people can adapt to electric boxes with different circuit layouts.

Description

Low-voltage DC-resistant current transformer

Technical Field

The invention relates to the technical field of electric power metering, in particular to a low-voltage direct-current-resistant 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. When the current transformer is installed, the current transformer often appears to be more cumbersome, is inconvenient to install and disassemble, is not convenient enough to operate, greatly reduces the working efficiency, and in addition, the wire is easy to move in the current transformer, is inconvenient to fix and influences the working quality of the current transformer.

Disclosure of Invention

The present invention is directed to a low-voltage dc-tolerant current transformer, so as to solve the problems mentioned in the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

a low-voltage DC-resistant current transformer comprises a current transformer body and a sliding shell movably connected to the bottom of the current transformer body; comprises that

The current transformer body comprises a shell, a composite iron core arranged in the shell and a secondary winding wound on the composite iron core; the secondary winding lead is connected to a binding post of the shell;

the shell bottom is connected a slip shell, follows current transformer body direction cross in the slip shell have a confession the fixed part of slip shell horizontal slip, fixed part include lower rack, support bar and at least one install in on the shell and with the gear that lower rack toothing is connected.

Preferably, the composite iron core is formed by combining a first iron core and a second iron core, a primary winding is wound on the first iron core and the second iron core, the first iron core and the second iron core are overlapped and combined from top to bottom, the head and the tail of the primary winding wound on the first iron core and the tail of the primary winding wound on the second iron core are combined respectively, and the first iron core and the second iron core are wound with the remaining secondary winding according to the current ratio by adopting a double-winding combination method.

Further preferably, the primary winding has 3 to 5 turns.

Further preferably, the first iron core and the second iron core are both silicon steel annular iron cores, an air gap is formed in each silicon steel annular iron core, and the air gap is smaller than 0.2 mm.

Further preferably, a central axis of the first core and a central axis of the second core coincide; the outer diameter and the inner diameter of the first iron core are respectively the same as those of the second iron core; the thickness of the first iron core is the same as that of the second iron core.

Preferably, a groove is formed in the top of the sliding shell, the bottom of the shell is arranged in the groove, and two ends of the groove are fixedly connected with the shell through bolts.

Preferably, a spline shaft penetrates through the center of the gear, one end of the spline shaft is welded on the inner wall of the rear side of the sliding shell, and the other end of the spline shaft penetrates through a center hole in the inner wall of the front side of the sliding shell and is connected with the inner wall of the front side of the sliding shell in a welding mode.

Further preferably, the lower rack is located at the bottom in the sliding shell, the supporting bar is located at the top in the sliding shell, and the gear is located between the supporting bar and the lower rack.

Further preferably, both ends of the supporting bar are connected with both ends of the lower rack.

Further preferably, both ends of the bottom of the front side wall of the sliding shell are provided with at least one through hole, and a bolt penetrates through the through hole and abuts against the side wall of the lower rack.

Compared with the prior art, the device has the advantages that the fixing part is directly installed in the electric box, so that the current transformer body is fixed in the electric box, the sliding shell slides leftwards and rightwards at the moment, the gear is driven to slide leftwards and rightwards relative to the fixing part, and the position of the current transformer body is adjusted, so that people can adapt to electric boxes with different circuit layouts.

Drawings

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

fig. 2 is a schematic diagram of a composite iron core structure of the current transformer of the present invention.

Fig. 3 is a structural diagram of the first iron core or the second iron core and the first winding in the invention.

Wherein, the current transformer body; 10-a housing; 11-a composite core; 12-a first core; 13-a second core; 141. 142 primary winding; 15-secondary winding; 16-a terminal post; 17-an air gap; 20-a sliding shell; 201-grooves; 202-bolt; 21-a through hole; 30-lower rack; 31-a support strip; 40-gear; 41-spline shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, a low-voltage dc-tolerant current transformer includes a current transformer body, a sliding shell 20 movably connected to the bottom of the current transformer body; the current transformer body comprises a shell 10, a composite iron core 11 arranged in the shell 10 and a secondary winding 15 wound on the composite iron core 11; the secondary winding 15 is connected to a terminal 16 of the shell 10 in a lead-in mode; the bottom of the outer shell 10 is connected with a sliding shell 20, a fixing part for the sliding shell 20 to slide left and right is transversely penetrated in the sliding shell 20 along the direction of the current transformer body 10, and the fixing part comprises a lower rack 30, a support bar 31 and at least one gear 40 which is arranged on the outer shell 10 and is meshed with the lower rack 30.

This embodiment is when installing, passes through mounting flange direct mount with fixed part in the electronic box, and then makes the current transformer body fix in the electronic box, and the slip shell that slides from side to side this moment, and then drives the gear and carry out the horizontal slip relatively down the rack, and then the position of adjustment current transformer body to in people adapt to different circuit layout's electronic box, the position of current transformer body can be adjusted according to the overall arrangement of electrical equipment in the electronic box to this device, and the people of being convenient for use.

The fixing part in the embodiment can adjust the positions of different current transformer bodies by connecting a plurality of current transformer bodies as required and connecting the sliding shells of the current transformer bodies in a left-right sliding manner.

Preferably, the top of the sliding shell 20 is provided with a groove 201, the bottom of the outer shell 10 is placed in the groove 201, and two ends of the groove 201 are fixedly connected with the outer shell 10 through bolts 202.

In this embodiment, there are two gears 40, wherein a spline shaft 41 penetrates through the center of the gear 40, one end of the spline shaft 41 is welded to the inner wall of the rear side of the sliding shell 20, and the other end of the spline shaft 41 penetrates through the center hole in the inner wall of the front side of the sliding shell 20 and is welded to the inner wall of the front side of the sliding shell 20.

Further preferably, the lower rack 20 is located at the bottom inside the sliding housing 20, the supporting bar 30 is located at the top inside the sliding housing 20, and the gear 40 is located between the supporting bar 33 and the lower rack 30.

Further preferably, two ends of the supporting bar 31 are connected to two ends of the lower rack 30, and two ends of the lower rack 30 are respectively provided with a fixing bolt for being mounted on an electric box or other physical positions.

Further preferably, at least one through hole 21 is further disposed at each of two ends of the bottom of the front side wall of the sliding shell 20, and a bolt penetrates through the through hole 21 and abuts against the side wall of the lower rack 30 to prevent the sliding shell 20 from moving back and forth relative to the fixed component.

As shown in fig. 2 and 3, the composite iron core 11 is formed by combining a first iron core 12 and a second iron core 13, primary windings (141, 142) are wound on the first iron core 12 and the second iron core 13, the first iron core 12 and the second iron core 13 are stacked and combined up and down, the heads and the tails of the primary windings (141, 142) wound on the first iron core 12 and the second iron core 13 are combined respectively, and the first iron core 12 and the second iron core 13 are wound with the remaining secondary winding 15 according to the current ratio by using a dual-winding combining method.

Further preferably, the primary winding (141, 142) has 3-5 turns.

Further preferably, the first iron core 12 and the second iron core 13 are all silicon steel annular iron cores, an air gap 17 is formed in each silicon steel annular iron core, and the air gap is smaller than 0.2 mm.

Further preferably, the central axis of the first core 12 and the central axis of the second core 13 coincide; the outer diameter and the inner diameter of the first core 12 are respectively the same as those of the second core 13; the thickness of the first core 12 is the same as that of the second core 13.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A low-voltage DC-resistant current transformer comprises a current transformer body and a sliding shell (20) movably connected to the bottom of the current transformer body; it is characterized in that the preparation method is characterized in that,

the current transformer body comprises a shell (10), a composite iron core (11) arranged in the shell (10), and a secondary winding (15) wound on the composite iron core (11); the secondary winding (15) is connected to a binding post (16) of the shell (10) in a lead-through manner;

the bottom of the shell (10) is connected with a sliding shell (20), a fixing part for the sliding shell (20) to slide left and right transversely is arranged in the sliding shell (20) along the direction of the current transformer body (10), and the fixing part comprises a lower rack (30), a supporting bar (31) and at least one gear (40) which is arranged on the shell (10) and is meshed with the lower rack (30) for connection.

2. The low-voltage direct-current-resistant current transformer according to claim 1, wherein the composite iron core (11) is formed by combining a first iron core (12) and a second iron core (13), primary windings (141, 142) are wound on the first iron core (12) and the second iron core (13) firstly, the first iron core (12) and the second iron core (13) are overlapped and combined up and down, heads and tails of the primary windings (141, 142) wound on the first iron core (12) and the second iron core (13) are combined respectively, and a secondary winding (15) left by the first iron core (12) and the second iron core (13) is wound according to a current ratio by adopting a double-winding combination method.

3. The LDC of claim 2, wherein said primary winding (141, 142) has 3-5 turns.

4. The low-voltage DC-tolerant current transformer according to claim 3, characterized in that the first iron core (12) and the second iron core (13) are silicon steel annular iron cores, and an air gap (17) is arranged on each silicon steel annular iron core and is smaller than 0.2 mm.

5. The LVDC current transformer according to claim 4, characterized in that the central axis of the first core (12) and the central axis of the second core (13) coincide; the outer diameter and the inner diameter of the first iron core (12) are respectively the same as those of the second iron core (13); the thickness of the first iron core (12) is the same as that of the second iron core (13).

6. The low-voltage direct-current resistant current transformer according to claim 1, wherein a groove (201) is formed in the top of the sliding shell (20), the bottom of the outer shell (10) is placed in the groove (201), and two ends of the groove (201) are fixedly connected with the outer shell (10) through bolts (202).

7. The LDC according to claim 1, wherein the gear (40) is centrally inserted through a spline shaft (41), one end of the spline shaft (41) is welded to the rear inner wall of the sliding shell (20), and the other end of the spline shaft (41) is inserted through a central hole in the front inner wall of the sliding shell (20) and is welded to the front inner wall of the sliding shell (20).

8. The LVDC current transformer according to claim 7, wherein the lower rack (20) is located at the bottom inside the sliding housing (20), the support bar (30) is located at the top inside the sliding housing (20), and the gear (40) is located between the support bar (33) and the lower rack (30).

9. The LVDC-tolerant current transformer according to claim 8, characterized in that both ends of the supporting bar (31) are connected with both ends of the lower rack (30).

10. The low-voltage direct-current resistant current transformer according to claim 8, wherein at least one through hole (21) is further formed at each end of the bottom of the front side wall of the sliding shell (20), and a bolt penetrates through the through hole (21) and abuts against the side wall of the lower rack (30).