Annular current transformer fixing device

Abstract

The utility model belongs to the field of electric power, aims to solve the technical problem that in the prior art, a cable needs to be disconnected for fixed installation, and provides an annular current transformer fixing device which comprises an annular current transformer, a CT ring fixing block, a CT ring fixing plate and screws. The whole CT ring fixing block is trapezoidal, the middle position of the front surface of the CT ring fixing block is provided with a via hole for an annular current transformer to pass through, and two sides of the top of the CT ring fixing block are provided with screw holes for screws to pass through; the CT ring fixing plate is an arc-shaped plate and is attached to the outer surface of a cable, the middle of the CT ring fixing plate is provided with a cable tie via hole allowing a cable tie to penetrate through, the two sides of the cable tie via hole are each provided with a limiting groove, and the outer sides of the limiting grooves are each provided with a reinforcing rib in the up-down and left-right direction. The annular current transformer comprises two semi-ring current transformers, and the two semi-ring current transformers are rotationally connected through a rotating shaft.

Description

Technical Field

[0001] The utility model belongs to the field of electric power, and in particular relates to a fixing device for a ring-shaped current transformer. Background Art

[0002] The statements in this section merely provide background art related to the present disclosure and do not necessarily constitute prior art.

[0003] In the power system, the current transformer (CT) is an important instrument in the power system.

[0004] The main function of a current transformer is to measure current. It can convert the current in a high current circuit into a low current signal for easy measurement and processing. Through the output signal of the current transformer, we can understand the current size, direction, waveform and other information in the circuit, thereby ensuring the normal operation of the power system.

[0005] High-current lines in power systems usually have very high voltages and electrical energy. If they are touched without protection, electric shock accidents will occur. By measuring with a current transformer, the current size can be obtained without touching the high-current line, maintaining the safety of construction personnel and equipment. Therefore, it is necessary to install and fix the current transformer on the cable for measurement. For example, the Chinese utility model patent with application number CN219874990U discloses a CT fixing device for a closed busbar, and specifically discloses that the current transformer is installed inside the closed housing and is coaxial with the closed housing when working.

[0006] The inventors found that since the current transformer is arranged inside the closed shell of the fixing device, when installing and fixing the current transformer, it is necessary to disconnect the cable for installation and fixing. The installation and fixing process is not only cumbersome, but also causes long power outages, resulting in high economic costs. Utility Model Content

[0007] In order to solve the above problems, the utility model proposes a ring-shaped current transformer fixing device. The utility model solves the technical problem that the prior art needs to disconnect the cable for fixed installation.

[0008] According to some embodiments, the utility model adopts the following technical solutions:

[0009] A ring current transformer fixing device comprises: a ring current transformer, a CT ring fixing block, a CT ring fixing plate and screws; the CT ring fixing block is trapezoidal as a whole, a through hole for the ring current transformer to pass through is provided in the middle position of the front of the CT ring fixing block, and screw holes for the screws to pass through are provided on both sides of the top of the CT ring fixing block; the CT ring fixing plate is an arc-shaped plate, which fits the outer surface of the cable, and a cable tie through hole is provided in the middle position for the cable tie to pass through, and limiting grooves are respectively provided on both sides of the cable tie through hole, and a reinforcing rib is respectively provided on the outer side of the limiting groove in the up, down, left and right directions; the ring current transformer comprises two half-ring current transformers, and the two half-ring current transformers are rotatably connected through a rotating shaft.

[0010] Furthermore, the screw passes through the CT ring fixing block through the screw hole, the middle through hole of the CT ring fixing block passes through the ring current transformer, the screw is pressed on the limit groove of the CT ring fixing plate, and the CT ring fixing plate is fitted with the cable.

[0011] Furthermore, the CT fixing plate is in a mountain shape.

[0012] Furthermore, the limiting groove corresponds to the screw hole.

[0013] Furthermore, the limiting groove is an annular circular groove, which is used to limit the screw.

[0014] Furthermore, the cable tie via is a tunnel-type via.

[0015] Furthermore, the through hole of the CT ring fixing block and the cable tie through hole is an arc-shaped channel.

[0016] Furthermore, the toroidal current transformer is concentrically mounted on the cable.

[0017] Furthermore, the CT fixing plate and the CT ring fixing block are both integrally formed.

[0018] Furthermore, the screw is used to adjust tightness.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1) The toroidal current transformer is put on the cable without disconnecting the cable. At the same time, the installation of the CT ring fixing block and the CT fixing plate is simple and easy to operate, and the cable does not need to be disconnected for installation and fixing.

[0021] 2) Ensure that the axis of the cable roughly coincides with the axis of the toroidal current transformer to achieve the best measurement effect.

[0022] 3) The CT ring fixing block is an integrally processed part, which can ensure its strength.

[0023] 4) The CT ring fixing plate has a tunnel-type through-hole, through which three CT ring fixing plates can be threaded together with a cable tie, making the fixation more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0025] Figure 1 It is a stereogram of an application embodiment of the utility model;

[0026] Figure 2 It is a top view of an application embodiment of the utility model;

[0027] Figure 3 yes Figure 1 A cross-sectional view of an application embodiment;

[0028] Figure 4 This is the front view of the CT ring fixing block;

[0029] Figure 5 This is the side view of the CT ring fixing block;

[0030] Figure 6 yes Figure 5 BB cross-sectional view;

[0031] Figure 7 yes Figure 4 AA section view;

[0032] Figure 8 It is the front view of the CT ring fixing plate;

[0033] Fig. 9 It is a side view of the CT ring fixing plate;

[0034] Fig.10 yes Figure 8 AA section view;

[0035] Fig.11 yes Figure 8 BB cross-sectional view;

[0036] Fig.12 is a schematic diagram of the open state of the toroidal current transformer.

[0037] Description of reference numerals:

[0038] Figure 1-Figure 12 The corresponding relationship between the component names and the reference numerals is as follows:

[0039] 1. Cable, 2. Ring current transformer, 3. CT ring fixing block, 4. CT ring fixing plate, 5. Screws, 6. Screw holes, 7. CT ring fixing block through holes, 8. Limiting grooves, 9. Reinforcing ribs, 10. Cable tie through holes, 11. Rotating shaft. DETAILED DESCRIPTION

[0040] like Figure 1 As shown, a ring current transformer fixing device comprises: a ring current transformer 2, a CT ring fixing block 3, a CT ring fixing plate 4 and screws 5; the CT ring fixing block 4 is trapezoidal as a whole, and a through hole for the ring current transformer 2 to pass through is provided in the middle position of the front of the CT ring fixing block 3, and screw holes 6 for the screws 5 to pass through are provided on both sides of the top of the CT ring fixing block 4; the CT ring fixing plate 4 is an arc-shaped plate, which fits the outer surface of the cable 1, and has a cable tie through hole 10 for the cable tie to pass through in the middle position, and limiting grooves 8 are respectively provided on both sides of the cable tie through hole 10, and a reinforcing rib 9 is respectively provided on the outer side of the limiting groove 8 in the up, down, left and right directions; the ring current transformer 2 can only work normally if it is concentrically installed on the high-voltage cable 1.

[0041] like Fig.12 As shown, the ring current transformer 2 includes two half-ring current transformers, which are rotatably connected via a rotating shaft 11 and can be combined into a complete ring current transformer 2. Therefore, the ring current transformer 2 can be sleeved on the cable 1 without disconnecting the cable 1.

[0042] Fixing a toroidal current transformer 2 requires 3 or 4 sets of fixing parts, which are evenly distributed around the circumference. The tightness of each set of fixing parts can be adjusted individually by screws 5, and it can also ensure that the axis of the cable 1 roughly coincides with the axis of the toroidal current transformer 2, so that the measurement effect is optimal. The application embodiment of the utility model adopts 3 sets of fixing parts.

[0043] like Figure 2 As shown, when the screw 5 is tightened, each CT ring fixing plate 4 applies a squeezing force to the cable 1, and at the same time each corresponding CT ring fixing block 3 applies a reverse squeezing force to the ring current transformer 2, so that the ring current transformer 2 can be supported on the cable 1.

[0044] like Figure 3 As shown, the assembly relationship of each part is that two screws 5 pass through the CT ring fixing block 3 from top to bottom, and the middle of the CT ring fixing block 3 passes through the ring current transformer 2. The two screws 5 are pressed on the CT ring fixing plate 4, and the CT ring fixing plate 4 is fitted with the cable 1.

[0045] like Figure 4 As shown, the CT ring fixing block 3 has a screw hole 6 at the top and bottom for installing the screw 5. Figure 5In the middle of the CT ring fixing block 3 is a CT ring fixing block through hole 7, which is adapted to the rectangular cross section of the toroidal current transformer 2. Figure 6 yes Figure 5 From the cross-sectional view, it can be seen that the CT ring fixing block through hole 7 is annular, the CT ring fixing block is an integrally processed part, which ensures its own strength, and the CT fixing plate is also integrally formed, and the two are processed by 3D printing processing technology.

[0046] like Figure 7 As shown, it can be seen that the through hole 7 of the CT ring fixing block is arc-shaped when viewed from above, and is adapted to the shape and size of the current transformer 2 when viewed from above.

[0047] Figure 8 4 is a front view of the CT ring fixing plate 4, which is an arc-shaped plate, and its overall shape is a mountain shape, such as Fig.10 As shown in the cross-sectional view, there are two limit grooves 8 on its front side, and the spacing between the limit grooves 8 is the same as the spacing between the two screw holes 6 of the CT ring fixing block 3. Each limit groove 8 is an annular circular groove, which is used to limit the screw 5 and ensure that its position is fixed in the limit groove 8 during installation. The reinforcing rib 9 is used to strengthen the strength of the CT ring fixing plate 4 to prevent its deformation in the xy direction.

[0048] Fig. 9 There is a cable tie through hole 10 in the middle of the middle CT ring fixing plate 4, which is a tunnel-type through hole. Figure 1 In the process, when the three sets of fixing parts are installed and debugged in place, finally a cable tie is passed through the cable tie through hole 10 in the middle of the three ct ring fixing plates 4 to wear the three ct ring fixing plates 4, so that the fixation is more reliable.

[0049] Fig.10 It can be seen that the cable tie hole 10 is arc-shaped, and the cable tie can be used to tighten the three ct ring fixing plates 4 in a ring shape. Fig.11 The cross section of the limiting groove 8 and the cross section of the cable tie through hole 10 can be seen.

Claims

1. A toroidal current transformer fixing device, characterized in that: include: Ring current transformer, CT ring fixing block, CT ring fixing plate and screws; the CT ring fixing block is trapezoidal as a whole, a through hole for the ring current transformer to pass through is provided in the middle position of the front of the CT ring fixing block, and screw holes for the screws to pass through are provided on both sides of the top of the CT ring fixing block; the CT ring fixing plate is an arc-shaped plate, which fits the outer surface of the cable, and has a cable tie through hole in the middle position for the cable tie to pass through, and limiting grooves are respectively provided on both sides of the cable tie through hole, and a reinforcing rib is provided on the outer side of the limiting groove in the up, down, left and right directions; the ring current transformer includes two half-ring current transformers, and the two half-ring current transformers are rotatably connected through a rotating shaft.

2. A ring current transformer fixing device as claimed in claim 1, characterized in that: The screw passes through the CT ring fixing block through the screw hole, the middle through hole of the CT ring fixing block passes through the ring current transformer, the screw is pressed on the limiting groove of the CT ring fixing plate, and the CT ring fixing plate is fitted with the cable.

3. A toroidal current transformer fixing device as claimed in claim 1, characterized in that: The CT fixing plate is in a mountain shape.

4. A toroidal current transformer fixing device as claimed in claim 1, characterized in that: The limiting groove corresponds to the screw hole.

5. A toroidal current transformer fixing device as claimed in claim 1, characterized in that: The limiting groove is an annular circular groove used for limiting the screw.

6. A toroidal current transformer fixing device as claimed in claim 1, characterized in that: The cable tie via is a tunnel-type via.

7. A toroidal current transformer fixing device as claimed in claim 1, characterized in that: The cable tie through hole is an arc-shaped channel.

8. A toroidal current transformer fixing device as claimed in claim 1, characterized in that: The through hole of the CT ring fixing block is an arc-shaped channel.

9. A toroidal current transformer fixing device as claimed in claim 1, characterized in that: The CT fixing plate and the CT ring fixing block are both integrally formed.

10. A toroidal current transformer fixing device as claimed in claim 1, characterized in that: The screw is used to adjust the tightness.

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