High-precision current transformer probe and wire-removal-free installation method thereof

Abstract

The invention relates to the technical field of current transformers, in particular to a high-precision current transformer probe and a disassembly-free installation method thereof, and the current transformer probe comprises a magnetic core clamping seat, a magnetic core, a coil clamping seat, an excitation coil, and a magnetic core winding and locking mechanism; the magnetic core clamping seats are of arc-shaped structures, and a plurality of magnetic core clamping seats are buckled and connected to form a circular ring structure through which a tested cable can pass; the magnetic core seamlessly surrounds the outer part of the circular ring structure; the coil clamping seat is of an annular structure; the exciting coil is wound outside the coil clamping seat; the circular ring structure is buckled and connected with the coil clamping seat; the magnetic core winding and locking mechanism is used for driving the magnetic core to surround the outer portion of the circular ring structure. According to the invention, flexible adaptation and power-off-free installation of cables with different diameters are realized, an air gap problem is avoided by the seamless surrounding magnetic core, high magnetic conductivity and measurement precision are ensured, and accurate and effective data are provided for online current monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformers, in particular to a high-precision current transformer probe and a wire-free installation method thereof. Background Art

[0002] In key areas such as power system protection, metering, and monitoring, online current monitoring technology plays a vital role, laying a solid technical foundation for the safe and stable operation of the power grid. Within this technology ecosystem, closed-circuit current transformers, as the most commonly used current measurement device, have gained widespread application due to their advantages, such as low magnetic field attenuation and high measurement stability, resulting from their closed-loop magnetic core design. However, the deployment of closed-circuit current transformers faces a significant challenge: during installation, one end of the cable to be tested must be removed from the terminal block and then inserted into the transformer. This means that the installation of such transformers can generally only be performed during a power outage. For substation cables that require long-term energized operation, this limitation significantly reduces the application scope of the transformer and also introduces significant inconvenience to maintenance and modification work.

[0003] To address this challenge, researchers began exploring open-type current transformers with retractable cores. While this type of transformer addresses the power outage restrictions during installation, its core is not enclosed, and an air gap inevitably exists between the cores when closed. The magnetic permeability of air is much lower than that of ferromagnetic materials, only about one ten-thousandth of that of ferromagnetic materials. This air gap directly reduces the transformer's accuracy and stability.

[0004] In order to alleviate this problem, researchers have proposed a variety of improvement schemes. CN201710634016.1 discloses a reclosable current transformer using a toothed open core, which reduces the air gap between interfaces by interference fit and meshing between the cores; CN202111215216.6 discloses a high-permeability open transformer core and its processing technology and open transformer, which further reduces the air gap by cutting the core interface into a plane and reducing the roughness of the cut surface. However, although these schemes have reduced the scope of the air gap to a certain extent, they are still unable to completely eliminate the air gap in essence, and therefore cannot make the open current transformer achieve the same accuracy and stability as the closed current transformer. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-precision current transformer probe and a wire-free installation method thereof in order to solve at least one of the above-mentioned technical problems. The installation of the transformer is completed without affecting the normal operation of the cable, and the online collection of the cable current is realized. At the same time, it is ensured that the transformer probe has an accuracy and stability comparable to that of a closed-type current transformer.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A high-precision current transformer probe, comprising: a magnetic core holder, a magnetic core, a coil holder, an excitation coil, a magnetic core winding and locking mechanism;

[0008] The magnetic core holder is an arc-shaped structure, and a plurality of the magnetic core holders are buckled and connected to form a circular ring structure through which the tested cable can pass; the magnetic core is seamlessly wrapped around the outside of the circular ring structure;

[0009] The coil holder is an annular structure; the excitation coil is wound around the outside of the coil holder;

[0010] The annular structure is interlocked with the coil holder;

[0011] The magnetic core winding and locking mechanism is used to drive the magnetic core to wrap around the outside of the ring structure.

[0012] Furthermore, the magnetic core is a long strip of Permalloy, and the excitation coil is a closed loop structure wound with copper wire.

[0013] Furthermore, the magnetic core holder is a clamp-type structure, a plurality of the magnetic core holders are connected end to end to form the ring structure, and the starting end of the magnetic core is clamped at the connection between two adjacent magnetic core holders.

[0014] Furthermore, the current transformer probe further comprises: a shell, which is used to fix the internal components of the current transformer probe and seal the entire current transformer probe.

[0015] Furthermore, the magnetic core winding and locking mechanism comprises: a driving rod, a torsion spring and a pawl;

[0016] The driving rod is parallel to the axis of the ring structure; one end of the driving rod is provided with a gear I, and the other end is sleeved with the torsion spring and the pawl; one end of the torsion spring is connected to the pawl, and the other end is connected to the housing;

[0017] The magnetic core holder is provided with a gear II at one end along the axis and a ratchet at the other end, and a magnetic core guide groove for winding the magnetic core is provided between the gear II and the ratchet;

[0018] The gear I is engaged with the gear II, and the pawl is matched and connected with the ratchet.

[0019] Furthermore, the housing comprises: an upper housing and a lower housing that can be snap-connected;

[0020] The driving rod, the torsion spring and the pawl are arranged inside the upper shell; the coil holder and the excitation coil are arranged inside the lower shell.

[0021] Furthermore, a fixed support is provided at the bottom of the lower shell.

[0022] Furthermore, the shell has an electromagnetic shielding layer.

[0023] Furthermore, one end of the driving rod close to the gear 1 extends to the outside of the shell.

[0024] A method for installing a high-precision current transformer probe without removing wires is applied to any of the above-mentioned high-precision current transformer probes, and the method comprises the following steps:

[0025] Separating at least two connected magnetic core holders, and fixing the starting end of the magnetic core to the connection between the two separated magnetic core holders;

[0026] Close all the magnetic core holders so that they are connected end to end to form a ring structure surrounding the cable under test;

[0027] The magnetic core holder is driven to rotate along its axis by the magnetic core winding and locking mechanism until the magnetic core is completely wound in the magnetic core guide groove on the outer periphery of the magnetic core holder;

[0028] The current transformer probe is moved along the measured cable to a suitable position and is fixed.

[0029] The beneficial effects of the present invention are:

[0030] The present invention does not require interruption of the power supply to the cable during installation, thereby ensuring the continuous operation of the cable. This greatly improves the flexibility and convenience of installation, making the current transformer probe an ideal choice for current monitoring of operating lines and renovation projects of old transformers.

[0031] The present invention adopts continuous long strips of Permalloy as the magnetic core material and uses a precise magnetic core winding and locking mechanism to fundamentally eliminate the air gap problem in the magnetic core and ensure that the magnetic core has excellent magnetic permeability performance.

[0032] The present invention not only significantly improves the measurement accuracy and stability of the mutual inductor, but also provides more accurate and reliable data support for online monitoring of cable current, demonstrating strong practical application value and broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is an overall structural diagram of a high-precision current transformer probe according to an embodiment of the present invention;

[0034] Figure 2 This is a diagram showing the internal structure of a high-precision current transformer probe according to an embodiment of the present invention;

[0035] Figure 3 A longitudinal cross-sectional view of a high-precision current transformer probe according to an embodiment of the present invention;

[0036] Figure 4 A method and process for installing a high-precision current transformer probe without removing the wires according to an embodiment of the present invention Figure 1 ;

[0037] Figure 5 A method and process for installing a high-precision current transformer probe without removing the wires according to an embodiment of the present invention Figure 2 ;

[0038] Figure 6 Schematic diagram of the installation of a high-precision current transformer probe according to an embodiment of the present invention Figure 1 ;

[0039] Figure 7 Schematic diagram of the installation of a high-precision current transformer probe according to an embodiment of the present invention Figure 2 .

[0040] Among them, 1. Shell, 11. Upper shell, 12. Lower shell, 121. Fixed support, 13. Electromagnetic shielding layer, 2. Driving rod, 21. Gear I, 3. Torsion spring, 4. Ratchet, 5. Magnetic core holder, 51. Gear II, 52. Ratchet, 6. Magnetic core, 7. Coil holder, 8. Excitation coil, 9. Cable under test. DETAILED DESCRIPTION

[0041] The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are only intended to enable those skilled in the art to better understand and implement the present invention, rather than to imply any limitation on the scope of the present invention.

[0042] As used herein, the term "including" and variations thereof are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment."

[0043] Example 1

[0044] Figure 1 This is an overall structural diagram of a high-precision current transformer probe according to an embodiment of the present invention; Figure 2 This is a diagram showing the internal structure of a high-precision current transformer probe according to an embodiment of the present invention; Figure 3 This is a longitudinal cross-sectional view of a high-precision current transformer probe according to an embodiment of the present invention. Figure 1-3 As shown, according to one embodiment of the present invention, a high-precision current transformer probe includes: a magnetic core holder 5, a magnetic core 6, a coil holder 7, an excitation coil 8, and a magnetic core winding and locking mechanism;

[0045] The magnetic core holder 5 is an arc-shaped structure. A plurality of magnetic core holders 5 are buckled and connected to form a circular ring structure through which the tested cable 9 can pass. The magnetic core 6 is seamlessly wrapped around the outside of the circular ring structure.

[0046] The coil holder 7 is an annular structure; the excitation coil 8 is wound around the outside of the coil holder 7;

[0047] The ring structure is interlocked with the coil holder 7;

[0048] The magnetic core winding and locking mechanism is used to drive the magnetic core 6 to wrap around the outside of the ring structure.

[0049] In this embodiment, the high-precision current transformer probe includes a core holder 5, an annular magnetic core 6, a coil holder 7, an excitation coil 8, and a core winding and locking mechanism. The core holder 5 is an openable annular structure with a cable pass-through area on the inner side. Two or more independently detachable arc-shaped core holders 5 are snapped together to form a circular ring structure through which the measured cable 9 can pass. This circular ring structure is flexible enough to accommodate cables of varying diameters. The magnetic core 6 is seamlessly wrapped around the outside of this circular ring structure, that is, the outside of the circular ring structure is completely surrounded by the core 6, with no gaps around the outer periphery. The coil holder 7 is an annular structure, and the excitation coil 8 is wound around the outside of the coil holder 7. The circular ring structure and the coil holder 7 are interlocked, with the axis of the circular ring structure perpendicular to the axis of the coil holder 7. The area inside the coil holder 7 does not affect the rotation of the core holder 5 about its center, and the core winding and locking mechanism can drive the magnetic core 6 to tightly wrap around the outside of the circular ring structure. The core winding and locking mechanism drives the core holder 5 to rotate around its axis through external tools or internal excitation self-driving (such as rotation through external tools or rotation driven by an internal motor), so as to achieve precise winding and locking of the magnetic core 6 to form a ring that seamlessly surrounds the outside of the circular structure, ensuring that the wound ring core 6 fits tightly, thereby improving the measurement accuracy and stability.

[0050] The present invention achieves flexible adaptation to cables of different diameters and installation without power outage through the design of a detachable arc-shaped magnetic core holder. The seamless surrounding magnetic core avoids the air gap problem, ensures high magnetic permeability and measurement accuracy, and provides accurate and effective data for online current monitoring. It is suitable for monitoring in-service lines and modifying old transformers, and has strong practicality and stability.

[0051] According to one embodiment of the present invention, the magnetic core 6 is a long strip of Permalloy, and the excitation coil 8 is a closed loop structure wound with a copper wire.

[0052] Preferably, the magnetic core holder 5 is a clamp-type structure, and multiple magnetic core holders 5 are connected end to end to form a ring structure, and the starting end of the magnetic core 6 is clamped at the connection between two adjacent magnetic core holders 5.

[0053] In this embodiment, the core holder 5 has a clamp-like structure. Two or more independently removable arc-shaped core holders 5 are connected end-to-end to form a circular ring structure. The magnetic core 6 is a continuous strip of Permalloy, which can be wound around the outer circumference of the ring structure. The excitation coil 8 is a closed loop structure wound with copper wire. It is arranged interlocking with the circular ring structure formed by the core holder 5. The area within the excitation coil 8 does not affect the rotation of the core holder 5 around its center.

[0054] The present invention adopts a clamp-type magnetic core holder and a continuous long strip of Permalloy magnetic core, as well as a closed excitation coil wound with copper wire. It not only enhances the flexibility and adaptability of the current transformer probe, enabling easy installation on cables of different diameters, but also improves the measurement accuracy and stability, providing a more reliable and efficient solution for online current monitoring.

[0055] According to one embodiment of the present invention, the current transformer probe further includes: a housing 1, which is used to fix the internal components of the current transformer probe and seal the entire current transformer probe.

[0056] Preferably, the housing 1 has an electromagnetic shielding layer 13 .

[0057] In this embodiment, the core holder 5, annular core 6, coil holder 7, excitation coil 8, core winding, and locking mechanism are fixed within the housing 1. The housing 1 not only secures the internal components but also effectively prevents external magnetic fields from interfering with the internal working environment of the transformer probe through its electromagnetic shielding layer 13.

[0058] By incorporating an electromagnetic shielding layer into the housing, this invention not only ensures the secure fixation and overall sealing of the current transformer probe's internal components, but also effectively shields interference from external magnetic fields, further improving measurement accuracy and stability. This design enables the current transformer probe to maintain high performance even in complex electromagnetic environments, providing a more reliable and accurate solution for online current monitoring.

[0059] According to one embodiment of the present invention, the magnetic core winding and locking mechanism includes: a driving rod 2, a torsion spring 3 and a pawl 4;

[0060] The drive rod 2 is parallel to the axis of the ring structure; a gear 1 21 is provided at one end of the drive rod 2, and a torsion spring 3 and a pawl 4 are sleeved at the other end; one end of the torsion spring 3 is connected to the pawl 4, and the other end is connected to the housing 1;

[0061] The core holder 5 is provided with a gear II 51 at one end along the axis and a ratchet 52 at the other end. A core guide groove for winding the magnetic core 6 is provided between the gear II 51 and the ratchet 52.

[0062] Gear I 21 meshes with gear II 51 , and pawl 4 matches with ratchet wheel 52 .

[0063] Preferably, the housing 1 comprises: an upper housing 11 and a lower housing 12 that can be snap-connected;

[0064] The driving rod 2 , the torsion spring 3 and the pawl 4 are arranged inside the upper shell 11 ; the coil holder 7 and the excitation coil 8 are arranged inside the lower shell 12 .

[0065] Preferably, a fixing support 121 is provided at the bottom of the lower shell 12 .

[0066] Preferably, one end of the driving rod 2 close to the gear 1 21 extends to the outside of the housing 1.

[0067] In this embodiment, the current transformer probe achieves efficient winding and locking of the magnetic core through a series of precise mechanical structures. The drive rod 2 is arranged parallel to the axis of the ring structure. The gear I 21 at one end of the drive rod 2 engages with the gear II 51 on the core holder 5. By rotating the drive rod 2, the ring structure formed by the core holder 5 can be driven to rotate. The magnetic core 6 is tightly wound around the outer periphery of the ring structure. During the winding process, the magnetic core 6 is always located in the core guide groove between the gear II 51 and the ratchet 52, ensuring that the magnetic core 6 can be seamlessly wound along the predetermined path. The other end of the drive rod 2 is an optical axis. The torsion spring 3 and the pawl 4 are sleeved on the optical axis portion of the drive rod 2. The pawl 4 matches the ratchet 52 on the core holder 5. When the magnetic core is wound in place, the elastic force of the torsion spring 3 locks the ratchet 52 through the pawl 4, thereby firmly maintaining the winding state of the magnetic core 6.

[0068] Housing 1 comprises an upper housing 11 and a lower housing 12 that can be snapped together and separated, facilitating assembly and maintenance of internal components. The drive rod 2, torsion spring 3, and pawl 4 are located within the upper housing, while the coil holder 7 and excitation coil 8 are housed within the lower housing, resulting in a streamlined and compact layout.

[0069] A fixing support 121 is also provided at the bottom of the lower housing 12 to facilitate the stable installation of the entire current transformer probe. The fixing methods of the fixing support 121 include but are not limited to screw fixing, buckle fixing, and binding fixing. The actual setting is set according to the application scenario requirements.

[0070] The end of the drive rod 2 near the gear 1 21 extends to the outside of the housing for easy user operation. The housing's fixing support 121 provides a variety of fixing methods, such as screw fixing, buckle fixing or binding fixing, to adapt to different application scenarios.

[0071] The magnetic core winding and locking mechanism of the present invention realizes efficient winding and firm locking of the magnetic core through precise mechanical structure design, ensuring high precision and stability of the current transformer probe; the shell design with snap-on connection not only facilitates the assembly and maintenance of internal components, but also provides a variety of fixing methods to adapt to the requirements of different application scenarios, greatly improving the accuracy and reliability of current measurement.

[0072] Example 2

[0073] like Figure 1-3 As shown, according to one embodiment of the present invention, a high-precision current transformer probe includes a shell 1, a driving rod 2, a torsion spring 3, a pawl 4, a magnetic core holder 5, a magnetic core 6, a coil holder 7 and an excitation coil 8.

[0074] The housing 1 comprises an upper housing 11 and a lower housing 12, which secure the internal components of the transformer probe and provide a complete seal. The drive rod 2, torsion spring 3, and pawl 4 are located in the upper housing 11, while the coil holder 7 and excitation coil 8 are secured to the lower housing 12. The magnetic core holder 5 can rotate along its axis within the housing 1.

[0075] The drive rod 2 has a gear 1 21 at one end and an optical axis at the other. A torsion spring 3 and a pawl 4 are sleeved onto the optical axis of the drive rod 2 and can rotate along the axis of the drive rod 2. The torsion spring 3 is restrained at one end by the pawl 4 and at the other end by the upper housing 11, providing a clockwise rotational torque to the pawl 4.

[0076] The core holder 5 is a semi-circular structure, with a gear II 51 at one end and a ratchet 52 at the other end. A core guide groove is formed between the gear II 51 and the ratchet 52. The core holder 5 has a snap-fit ​​structure at both ends, and the two core holders 5 form a complete ring with a cable pass-through area inside the ring. The axis of the core holder 5 is located directly below the axis of the drive rod 2. When the drive rod 2 is rotated counterclockwise, the gear I 21 can drive the gear II 51 to rotate. At the same time, the clockwise reversal of the core holder 5 is limited by the cooperation of the pawl 4 and the ratchet 52. The magnetic core 6 is a continuous long strip of permalloy, wound in the core guide groove of the core holder 5.

[0077] The coil holder 7 is a closed loop structure. The excitation coil 8 is a copper wire wound around the coil holder 7. The core holder 5 and the coil holder 7 are interlocked. The inner area of ​​the coil holder 7 provides space for the rotation of the core holder 5.

[0078] The housing 1 is provided with an electromagnetic shielding layer 13 filled with high permeability ferromagnetic material to avoid the influence of external magnetic fields. The lower housing 12 has a fixing support 121 for fixing the entire mutual inductor.

[0079] The high-precision current transformer probe of this invention achieves efficient winding and secure locking of the core through the ingeniously designed drive rod, torsion spring, and pawl, which work together with the core holder. Furthermore, the use of a continuous, long strip of Permalloy core eliminates air gap issues, improving the transformer's accuracy and stability. Furthermore, an internal electromagnetic shielding layer effectively mitigates the effects of external magnetic fields, ensuring measurement accuracy. The overall structure is compact and easy to install and disassemble, making it particularly suitable for current monitoring on in-service lines.

[0080] Example 3

[0081] Figure 4 A method and process for installing a high-precision current transformer probe without removing the wires according to an embodiment of the present invention Figure 1 ; Figure 6 Schematic diagram of the installation of a high-precision current transformer probe according to an embodiment of the present invention Figure 1 ; Figure 7 Schematic diagram of the installation of a high-precision current transformer probe according to an embodiment of the present invention Figure 2 .like Figure 4 、 Figure 6 and Figure 7 As shown, according to one embodiment of the present invention, a method for installing a high-precision current transformer probe without removing the wires is applied to any high-precision current transformer probe of the present invention, and the method includes the following steps:

[0082] Step S102, separating at least two connected magnetic core holders 5, and fixing the starting end of the magnetic core 6 to the connection between the two separated magnetic core holders 5;

[0083] Step S104: closing all the magnetic core holders 5 so that they are connected end to end to form a ring structure surrounding the cable 9 under test;

[0084] Step S106: The core clamp 5 is driven to rotate along its axis by the core winding and locking mechanism until the core 6 is completely wound in the core guide groove on the outer periphery of the core clamp 5;

[0085] Step S108 : moving the current transformer probe along the measured cable 9 to a suitable position and fixing the current transformer probe.

[0086] In this embodiment, the high-precision current transformer probe installation method without wire removal achieves rapid installation without interrupting the operation of the cable under test 9 through an innovative design. First, the core holder 5 is separated to open a gap, and the starting end of the continuous long strip of permalloy core 6 is fixed to the connection between the two separated core holders 5, so that the core 6 is fixed in the core guide groove of the core holder 5. Then, the openings of all the core holders 5 are closed to form a ring structure around the cable under test 9, ensuring that the cable can smoothly pass through the radial gap of the core holder 5, so that the core holder 5 surrounds the cable under test in operation. Next, the core winding and locking mechanism is used to drive the core holder 5 to rotate along its axis, so that the core 6 is tightly and evenly wound in the core guide groove on the outer periphery of the core holder 5, achieving efficient winding and fixation of the core 6. Finally, the entire current transformer probe is moved along the cable under test 9 to the desired measurement position and securely installed using the fixed support 121 on the housing 1.

[0087] The present invention realizes rapid installation and disassembly without affecting cable operation through the ingeniously designed core holder separation and closing, core winding and locking mechanism. The use of continuous Permalloy core winding effectively avoids the air gap problem, improves the accuracy and stability of the transformer, and provides more accurate and effective data for online monitoring of cable current. It is particularly suitable for current monitoring of operating lines and the renovation of old transformers.

[0088] Example 4

[0089] Figure 5 A method and process for installing a high-precision current transformer probe without removing the wires according to an embodiment of the present invention Figure 2 .like Figure 5-7 As shown, according to one embodiment of the present invention, a method for installing a high-precision current transformer probe without removing the wires is applied to any high-precision current transformer probe of the present invention, and the method includes the following steps:

[0090] Step S202: Open the upper housing 11 to separate the two magnetic core holders 5 to form an opening, and fix the magnetic core 6 in the magnetic core guide groove of the magnetic core holder 5;

[0091] Step S204: closing the upper housing 11 so that the two magnetic core holders 5 are engaged and surround the tested cable 9;

[0092] Step S206: rotating the driving rod 2 counterclockwise to drive the magnetic core holder 5 to rotate along its axis until the magnetic core 6 is completely wound in the magnetic core guide groove of the magnetic core holder 5;

[0093] Step S208 : Move the transformer as a whole along the tested cable 9 to a proper position, and fix it using the fixing support 121 .

[0094] In this embodiment, first, by opening the upper shell 11, the two core holders 5 are separated to form an opening, which facilitates the fixing of the starting end of the continuous long strip of magnetic core 6 in the core guide groove of the core holder 5. Subsequently, the upper shell 11 is closed, and the two core holders 5 are buckled to form a complete ring structure, and tightly surround the measured cable 9, ensuring that the cable can smoothly pass through the radial notch of the core holder. Then, the drive rod 2 is rotated counterclockwise, and the gear I 21 at one end of the drive rod 2 is engaged with the gear II 51 at one end of the core holder 5, and the pawl 4 is matched with the ratchet 52, which drives the core holder 5 to rotate along its axis, so that the magnetic core 6 is tightly and evenly wound in the core guide groove of the outer periphery of the core holder 5, realizing efficient winding and fixing of the magnetic core 6. Finally, the entire current transformer probe is moved to the desired measurement position along the measured cable 9 and is firmly installed using the fixed support 121 on the lower shell 12.

[0095] The present invention enables the rapid and accurate installation of a high-precision current transformer probe without interrupting the operation of the cable being tested. The ingenious design of the magnetic core holder and the cooperation of the drive mechanism ensure the tight winding and firm fixation of the magnetic core, thereby improving the measurement accuracy and stability of the transformer. This method is particularly suitable for current monitoring in operating lines, providing a strong guarantee for the safe and stable operation of the power system.

[0096] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

[0097] It should be understood that the size of the serial numbers of each step in the content of the invention and the embodiments of the present invention does not absolutely mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

Claims

1. A high-precision current transformer probe, characterized in that: include: Magnetic core holder (5), magnetic core (6), coil holder (7), excitation coil (8), magnetic core winding and locking mechanism; The magnetic core holder (5) is an arc-shaped structure, and a plurality of the magnetic core holders (5) are buckled and connected to form a circular ring structure through which the tested cable (9) can pass; the magnetic core (6) is seamlessly surrounded by the outside of the circular ring structure; The coil holder (7) is an annular structure; the excitation coil (8) is wound outside the coil holder (7); The annular structure is interlocked and connected with the coil holder (7); The magnetic core winding and locking mechanism is used to drive the magnetic core (6) to wrap around the outside of the circular ring structure.

2. The high-precision current transformer probe according to claim 1, characterized in that: The magnetic core (6) is a long strip of Permalloy, and the excitation coil (8) is a closed loop structure wound with a copper wire.

3. The high-precision current transformer probe according to claim 2, characterized in that: The magnetic core holder (5) is a clamp-type structure, and a plurality of the magnetic core holders (5) are connected end to end to form the circular ring structure, and the starting end of the magnetic core (6) is clamped at the connection between two adjacent magnetic core holders (5).

4. The high-precision current transformer probe according to claim 1, characterized in that: The current transformer probe further comprises: a housing (1) used for fixing the internal components of the current transformer probe and sealing the entire current transformer probe.

5. The high-precision current transformer probe according to claim 4, characterized in that: The magnetic core winding and locking mechanism comprises: a driving rod (2), a torsion spring (3) and a ratchet (4); The driving rod (2) is parallel to the axis of the circular ring structure; one end of the driving rod (2) is provided with a gear 1 (21), and the other end is sleeved with the torsion spring (3) and the pawl (4); one end of the torsion spring (3) is connected to the pawl (4), and the other end is connected to the housing (1); The magnetic core holder (5) is provided with a gear II (51) at one end along the axis and a ratchet (52) at the other end, and a magnetic core guide groove for winding the magnetic core (6) is provided between the gear II (51) and the ratchet (52); The gear I (21) is meshed with the gear II (51), and the pawl (4) is matched and connected with the ratchet wheel (52).

6. The high-precision current transformer probe according to claim 5, characterized in that: The housing (1) comprises: an upper housing (11) and a lower housing (12) that can be snap-connected; The driving rod (2), the torsion spring (3) and the ratchet (4) are arranged inside the upper shell (11); the coil holder (7) and the excitation coil (8) are arranged inside the lower shell (12).

7. The high-precision current transformer probe according to claim 6, characterized in that: A fixing support (121) is provided at the bottom of the lower shell (12).

8. The high-precision current transformer probe according to claim 4, characterized in that: The housing (1) has an electromagnetic shielding layer (13).

9. The high-precision current transformer probe according to claim 5, characterized in that: One end of the driving rod (2) close to the gear I (21) extends to the outside of the housing (1).

10. A method for installing a high-precision current transformer probe without removing wires, applied to the high-precision current transformer probe as claimed in any one of claims 1 to 9, characterized in that: The method comprises the following steps: Separating at least two connected magnetic core holders (5), and fixing the starting end of the magnetic core (6) at the connection between the two separated magnetic core holders (5); Closing all the magnetic core holders (5) so that they are connected end to end to form a circular ring structure surrounding the cable (9) under test; The magnetic core clamp (5) is driven to rotate along its axis by the magnetic core winding and locking mechanism until the magnetic core (6) is completely wound in the magnetic core guide groove on the outer periphery of the magnetic core clamp (5); The current transformer probe is moved along the measured cable (9) to a suitable position and the current transformer probe is fixed.

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