Electricity-taking CT

Abstract

The utility model provides a power-taking CT, which comprises a shell and an annular iron core. The shell is provided with an annular containing cavity. And two wiring terminals are arranged on the shell. The multiple annular iron cores are arranged in the containing cavity at intervals in the axis direction of the annular containing cavity. And a winding is wound on each annular iron core. One end of each winding is connected with one terminal, and the other end of each winding is connected with the other terminal. The power-taking CT provided by the utility model can ensure that the number of turns of the winding is increased, and meanwhile, the output current on the wiring end is maintained under the condition that the turn ratio is improved, so that the energy conversion efficiency is further ensured, the heating of the annular iron core can be effectively reduced, the service life is further prolonged, and the practicability is strong.

Description

Technical Field

[0001] This utility model belongs to the field of current transformer technology, specifically relating to a current transformer CT. Background Technology

[0002] A current transformer (CT), also known as a power-taking current transformer, is a special type of current transformer whose main function is to convert a certain amount of electrical energy in a high-voltage system into usable low-voltage electrical energy for use by electronic equipment for measurement, control, or protection. These transformers are commonly used in high-voltage power grids, especially when other power supply methods are lacking, to provide power to electronic equipment. The working principle of a power-taking CT is based on electromagnetic induction. Its primary side (high-voltage side) is typically connected to the high-voltage line of the power system, while its secondary side (low-voltage side) is connected to the equipment requiring power. When the current on the primary side changes, a corresponding current is generated on the secondary side due to electromagnetic induction, thereby providing electrical energy to the load on the secondary side.

[0003] In existing technologies, the current generated by the current transformer (CT) needs to be supplied to the electronic equipment, resulting in a relatively large current in its secondary coil to ensure stable operation. This limits the number of turns in the secondary coil, leading to a relatively small turns ratio between the primary and secondary sides of the current transformer. This reduces energy conversion efficiency and, to some extent, further promotes core heating. Over time, this heating accelerates aging, resulting in noise, a shorter lifespan, and poor practicality. Utility Model Content

[0004] This utility model provides an electro-optical CT scanner, which aims to solve the problem of poor practicality of existing electro-optical CT scanners.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide an electro-optic CT scanner, comprising:

[0006] The outer casing has an annular receiving cavity; the outer casing is provided with two terminals;

[0007] Multiple annular iron cores are provided, and each annular iron core is arranged at intervals in the receiving cavity along the axial direction of the annular receiving cavity; each annular iron core is wound with a winding; one end of each winding is connected to one of the terminals, and the other end is connected to the other terminal.

[0008] In one possible implementation, the housing is provided with a through-hole for a high-voltage line to pass through, the through-hole being coaxially arranged with the annular receiving cavity.

[0009] In a possible implementation, the power taking CT further comprises a filling resin, which is used for casting in the annular accommodating cavity to fix each annular core and each winding.

[0010] In a possible implementation, the shell comprises:

[0011] a first shell having a first semi-annular cavity;

[0012] a second shell having a second semi-annular cavity, the first semi-annular cavity and the second semi-annular cavity being combined to form the annular accommodating cavity after the two ends of the second shell are butted with the two ends of the first shell;

[0013] a locking structure for locking the butted first shell and second shell.

[0014] In a possible implementation, each annular core comprises:

[0015] a first core arranged in the first semi-annular cavity;

[0016] a second core arranged in the second semi-annular cavity, the second core being used for being butted with the first core at two ends to form a closed loop structure after the second shell is butted with the first shell;

[0017] wherein the corresponding windings are respectively wound on the outer circumferential surfaces of the first core and the second core.

[0018] In a possible implementation, the first core and the second core are of the same structure; the first core and the second core are both of semi-annular outer shape structure and rectangular cross section.

[0019] In a possible implementation, a sealing ring is arranged at each butted end of the first shell and the second shell.

[0020] In a possible implementation, the wiring end is a terminal post.

[0021] In the implementation, a plurality of annular cores are arranged in the annular accommodating cavity in the shell, each annular core and the corresponding winding can work independently, and each winding is connected in parallel on the two wiring ends of the shell. The structure can ensure that the number of turns of the winding is increased, the output current on the wiring end is maintained in the case of increasing the turn ratio, the energy conversion efficiency is ensured, the heating of the annular core is effectively reduced, and the service life is prolonged, and the practicability is high. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Structure of the power taking CT provided in the embodiments of the utility modelFigure 1 ;

[0023] Figure 2 The utility model provides a structure diagram of each annular core of the electricity taking CT provided by the utility model embodiment;

[0024] Figure 3 The utility model provides another structure diagram of the shell of the electricity taking CT provided by the utility model embodiment;

[0025] Mark explanation:

[0026] 10, shell, 11, first shell, 12, second shell, 13, sealing ring, 14, locking structure, 15, via hole, 16, terminal post, 20, annular core, 21, first core, 22, second core, 30, winding. Specific embodiment

[0027] In order to make the technical problem, technical scheme and beneficial effect that the utility model wants to solve more clear and clear, the following is combined with the drawing and embodiment, and the utility model is further detailed.The specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0028] Please see Figure 1 And Figure 2 Now the electricity taking CT provided by the utility model is described.

[0029] The electricity taking CT includes the shell 10 and the annular core 20.The shell 10 has annular accommodating cavity.Two terminal posts are arranged on the shell 10.The annular core 20 is arranged in the accommodating cavity in the axial direction of the annular accommodating cavity.The winding 30 is arranged on each annular core 20.The one end of each winding 30 is connected with one terminal post, and the other end is connected with another terminal post.

[0030] The electricity taking CT provided by the embodiment is compared with prior art, and the multiple annular cores 20 are arranged in the annular accommodating cavity in the shell 10, and each annular core 20 and corresponding winding 30 can work independently, and each winding 30 is connected in parallel on the two terminal posts on the shell 10, which can guarantee the number of turns of the winding 30 to increase, maintain the output current on the terminal post under the condition of improving the number of turns, and guarantee the energy conversion efficiency, which can effectively reduce the heating of the annular core 20, thereby prolonging the service life, and the practicability is strong.

[0031] Specifically, the power taking principle of the power taking CT is related to the ratio of the current of the primary side to the current of the secondary side, which is inversely proportional to the number of turns of the primary side winding 30 and the secondary side winding 30. That is, N1 / N2 = I2 / I1. Therefore, the power taking CT provided in the embodiment can ensure that the thickness of the original ring-shaped iron core 20 is reduced without changing the shell 10. Assuming that the number of ring-shaped iron cores 20 is m, the thickness of each ring-shaped iron core 20 can be reduced to 1 / m of the original core thickness.

[0032] In some embodiments, the shell 10 described above can adopt the structure as shown in Figure 1 and Figure 3 . Referring to Figure 1 and Figure 3 , the shell 10 is provided with a via hole 15 capable of passing through a high-voltage line, and the via hole 15 is coaxially arranged with the ring-shaped accommodating cavity. The via hole 15 arranged on the shell 10 can be sleeved on the high-voltage line, thereby ensuring that a certain amount of energy on the high-voltage line is collected and transmitted to the electronic device.

[0033] The shell 10 can be a circular ring-shaped structure, and the ring-shaped accommodating cavity is located inside the shell 10, and the inner hole of the shell 10 is the via hole 15.

[0034] In some embodiments, referring to Figure 2 , the power taking CT further comprises a filling resin capable of being cast in the ring-shaped accommodating cavity to fix the ring-shaped iron cores 20 and the windings 30.

[0035] The filling resin can mainly ensure that the ring-shaped iron cores 20 and the corresponding windings 30 are sealed and separated.

[0036] In the embodiment, a ring-shaped partition plate can be arranged between any two adjacent ring-shaped iron cores 20.

[0037] In order to facilitate the casting of the filling resin, the shell 10 can be provided with an opening communicating with the ring-shaped accommodating cavity, and a cover plate capable of sealing the opening, and the cover plate can be detachably connected with the shell 10. This structure can also ensure that the ring-shaped iron cores 20 are placed before the filling resin is cast.

[0038] In some embodiments, the shell 10 described above can adopt the structure as shown in Figure 1 and Figure 3 . Referring to Figure 1 and Figure 3The shell 10 comprises a first shell 11, a second shell 12 and a locking structure 14. The first shell 11 has a first semi-annular cavity. The second shell 12 has a second semi-annular cavity. When the two ends of the second shell 12 are matched with the two ends of the first shell 11, the first semi-annular cavity and the second semi-annular cavity combine to form an annular accommodating cavity. The locking structure 14 can lock the matched first shell 11 and second shell 12.

[0039] The shell 10 is provided in a split type, which can facilitate the shell to be sleeved on the high-voltage line.

[0040] Regarding a preferred embodiment of the locking structure 14, the locking structure 14 can be a throat clamp. When the locking structure 14 is the throat clamp, annular grooves are arranged on the outer circumferential surfaces of the first shell 11 and the second shell 12 to ensure the limiting of the throat clamp.

[0041] Of course, one end of the first shell 11 and the second shell 12 can be hinged, and the other end can be clamped by a buckle. At this time, the hinged part of the first shell 11 and the second shell 12 and the buckle can also serve as the locking structure 14.

[0042] In some embodiments, the above-mentioned annular core 20 can adopt a structure as shown in Figure 2 Referring to Figure 2 Each annular core 20 comprises a first core 21 and a second core 22. The first core 21 is arranged in the first semi-annular cavity. The second core 22 is arranged in the second semi-annular cavity. After the second shell 12 is matched with the first shell 11, the two ends of the second core 22 are matched with the two ends of the first core 21 to form a closed loop structure.

[0043] Specifically, the corresponding windings 30 are wound on the outer circumferential surfaces of the first core 21 and the second core 22.

[0044] The annular core 20 comprises the first core 21 and the second core 22, which can be matched with the first shell 11 and the second shell 12. After the high-voltage line is installed, the via hole 15 can be opened to facilitate the shell to be sleeved on the high-voltage line, and the shell can be conveniently disassembled from the high-voltage line.

[0045] The coils wound on the corresponding first core 21 and second core 22 are in series to form the winding 30. For example, the number of turns of the coil on the first core 21 is 1000, and the number of turns of the coil on the second core 22 is 1000. The two coils are in series, and one end of the winding 30 is electrically connected to one of the two connection terminals, and the other end is electrically connected to the other connection terminal.

[0046] In some embodiments, the above-mentioned first core 21 and second core 22 can adopt a structure as shown in Figure 2 Referring to Figure 2The first iron core 21 and the second iron core 22 are of the same structure. The first iron core 21 and the second iron core 22 are of a semi-annular outer shape structure and a rectangular cross section, which is convenient for manufacturing and assembling.

[0047] In some embodiments, the first shell 11 and the second shell 12 can adopt the structure as shown in Figure 1 and Figure 3 . Referring to Figure 1 and Figure 3 , the first shell 11 and the second shell 12 are both provided with a sealing ring 13 at two opposite ends, which can seal the annular accommodating cavity and has the effect of preventing water and moisture, and the sealing ring 13 is elastic, which can adapt to thermal expansion and contraction.

[0048] It should be noted that the sealing ring 13 can be an annular sealing ring 13, which needs to have an opening for the first iron core 21 or the second iron core 22 to pass through, and the two ends of the first iron core 21 need to protrude from the two ends of the first shell 11, and the two ends of the second iron core 22 need to protrude from the two ends of the second shell 12.

[0049] In some embodiments, the above-mentioned wiring end can adopt the structure as shown in Figure 1 and Figure 3 . Referring to Figure 1 and Figure 3 , the wiring end is a wiring column 16, which can ensure electrical connection with each winding 30, and also can ensure electrical connection with an external electronic device.

[0050] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A powered CT, characterized in that, The utility model relates to a high-voltage transformer, comprising: a housing having an annular accommodating cavity; the housing is provided with two wiring terminals; a plurality of annular cores are arranged in the accommodating cavity along the axial direction of the annular accommodating cavity; each annular core is provided with a winding; one end of each winding is connected to one of the wiring terminals, and the other end is connected to the other wiring terminal.

2. The powered CT of claim 1, wherein, The housing is provided with a through hole for a high-voltage line to pass through, and the through hole is coaxially arranged with the annular accommodating cavity.

3. The powered CT of claim 1, wherein, The power taking CT further comprises a filling resin for pouring in the annular accommodating cavity to fix the annular cores and the windings.

4. The powered CT of any one of claims 1-3, wherein, The housing comprises: a first shell having a first semi-annular cavity; a second shell having a second semi-annular cavity, and when the two ends of the second shell are engaged with the two ends of the first shell, the first semi-annular cavity and the second semi-annular cavity combine to form the annular accommodating cavity; a locking structure for locking the engaged first shell and second shell.

5. The powered CT of claim 4, wherein, Each annular core comprises: a first core arranged in the first semi-annular cavity; a second core arranged in the second semi-annular cavity, and when the second shell is engaged with the first shell, the two ends of the second core are engaged with the two ends of the first core to form a closed loop structure; wherein the corresponding windings are wound around the outer circumferential surfaces of the first core and the second core.

6. The powered CT of claim 5, wherein, The first core and the second core have the same structure; both the first core and the second core have a semi-annular shape and a rectangular cross-section.

7. The powered CT of claim 4, wherein, Sealing rings are arranged at the two engaged ends of the first shell and the second shell.

8. The powered CT of claim 1, wherein, The wiring terminal is a terminal post.

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