A zero-sequence current transformer

Abstract

The present invention discloses a zero-sequence current transformer, including a transformer module which is an open-type zero-sequence current transformer. The transformer module has a front component, a rear component combined with each other, and an angle iron piece for locking the front component and the rear component. Both the front component and the rear component are U-shaped iron cores and are arranged in a mirror image. An activity bar is arranged on the front sides of the front component and the rear component. The angle iron pieces are distributed on the outer sides of the front component and the rear component and are locked by bolts between them. A rectangular iron core channel is formed between the front component and the rear component; an integrated base is used to lock and install the transformer module and provide protection. The integrated base includes a bottom frame seat, a protective outer frame and a locking structure. Installation edges are arranged on both sides of the bottom of the bottom frame seat. An opening is provided on the top surface of the bottom frame seat, and through holes communicating with each other are opened on both sides of the top of the bottom frame seat. Through the rectangular open-type design, the present invention combines an innovative modular structure and an integrated base, and is more suitable for large-section single-core cables and two cables connected in parallel.

Description

Technical Field

[0001] The present invention relates to the field of current transformers in power systems, and specifically to a zero-sequence current transformer. Background Art

[0002] With the continuous development and improvement of modern power systems, higher requirements are put forward for the safety and stability of power equipment. Especially in power protection and monitoring systems, as one of the important devices, the zero-sequence current transformer undertakes the important tasks of monitoring the operation status of the system and preventing electrical accidents. Zero-sequence current transformers are widely used in many fields such as power, railway, petroleum, and chemical industry. Their main function is to detect the zero-sequence components in three-phase currents, especially playing an important role in abnormal situations such as ground faults, leakage, and overload. Therefore, the stability, accuracy, and durability of zero-sequence current transformers are particularly important.

[0003] In the prior art regarding zero-sequence current transformers, the technical solutions are as follows:

[0004] 1) Publication No. CN110459381B discloses an opening and closing type current transformer. In this technical application, it includes a combined front component and a rear component. The front component includes an upper base, an upper top cover, and a U-shaped upper iron core. The upper base and the upper top cover are combined through a snap structure, and the upper iron core is accommodated in the upper iron core channel formed by the combination of the upper base and the upper top cover. The rear component includes a lower base and a first bracket, a second bracket, and a U-shaped lower iron core accommodated in the lower base. The first bracket and the second bracket are combined through a snap structure, and the first bracket, the second bracket, and the lower iron core are combined to form a lower iron core component. A coil is wound on the lower iron core component to form a magnetic core coil component, and the lower base is connected to the magnetic core coil component through a snap structure. For the opening and closing type current transformer of the present invention, the components of the front component and the rear component all adopt a snap structure to achieve quick snap connection, which can be quickly installed without tools, with firm, reliable, and good sealing.

[0005] 2) Publication No. CN208256458U discloses an opening and closing type zero-sequence current transformer. In this technical application, it includes a semi-circular first shell and a second shell, and a semi-circular first iron core and a second iron core. The first iron core and the second iron core are respectively cast in the first shell and the second shell through resin. The two ends of the first shell and the second shell are detachably butted to form an annular shell and fixed by a hose clamp. The two ends of the first iron core and the second iron core are butted to form an annular iron core. A winding coil is wound around the first iron core or the second iron core. A wiring terminal is provided on the annular shell, and the winding coil is connected to the wiring terminal. Four cable clamping members are provided on the inner circumferential surface of the annular shell along the circumferential direction. This utility model has a simple structure, good stability, is easy to manufacture, has fewer manufacturing molds, low cost, is simple to install and maintain, and has a good fixing effect.

[0006] 3) Publication number CN206806160U discloses an opening type zero-sequence current transformer. In this technical application, it includes a first semi-circular insulating housing and a second semi-circular insulating housing. A first semi-circular iron core is provided inside the first semi-circular insulating housing. There is a first coil outside the first semi-circular iron core, and a first outer insulating layer outside the first coil. The structure on one side of the second semi-circular insulating housing is the same. There is a first magnetic conduction layer on the upper end face of the first semi-circular iron core, and a second magnetic conduction layer on the lower end face of the first semi-circular iron core. There is a third magnetic conduction layer on the upper end face of the second semi-circular iron core, and a fourth magnetic conduction layer on the lower end face of the second semi-circular iron core. The first semi-circular insulating housing and the second semi-circular insulating housing are buckled together to form a circular ring, and an angle iron piece is hoop-mounted on the outer surface. The end of the angle iron piece is fixed by bolts and nuts. This utility model adopts a clamp structure, which well meets the convenience of users for loading and unloading.

[0007] 4) Publication number CN107045929A discloses a manufacturing method and casting mold for an opening and closing type zero-sequence current transformer. In this technical application, it includes process steps such as the manufacture of two semi-circular iron cores, winding of coils, molding of the body by mold casting, and assembly of the semi-circular body casting. The mold body is assembled by a semi-circular body, left and right templates arranged on both sides of the semi-circular body, and a cover plate on the upper part. There is a semi-circular cavity inside the mold, and two grooves are provided on the inner surface of the cover plate. Strong magnets for adsorbing the semi-circular coil iron core to be cast are provided in the grooves. Its characteristics are: This manufacturing method shortens the production cycle of the product, improves the qualified rate of the product in the first production run, and reduces the production cost. The mold adopts an assembled structure, with low manufacturing cost, convenient and fast assembly and disassembly, reducing labor intensity and improving labor efficiency. The semi-circular coil iron core is hoisted by the way of strong magnet adsorption, with large adsorption force and accurate positioning. After the semi-circular coil iron core is positioned, it will not change, making the thickness of the insulator of the cast current transformer the same, ensuring the insulation performance of the product and also improving the qualified rate of the product.

[0008] However, there are some technical problems in the above zero-sequence current transformers during actual use.

[0009] 1. For the currently widely used KYN series switchgears, the zero-sequence current transformers installed in the cable compartment are all round-hole (arc-shaped structure) current transformers with different aperture diameters. When using this type of current transformer, the three-phase cables must pass through a cable hole into the cable compartment. This wiring method is only applicable to three-core cables or single-core cables with small cross-sections. With the continuous growth of power loads, these two types of cables have gradually been replaced by large cross-section single-core cables with larger current-carrying capacities. In some cases, even two cables need to be connected in parallel for each phase of the feeder. Due to the torque of the cables themselves, the three-phase cables cannot pass through a single cable hole into the cable compartment and need to pass through three cable holes separately. In this way, the existing zero-sequence cable current transformers cannot be installed in the cable compartment and can only be randomly put on at a three-phase cable gathering point under the cabinet. At the same time, the shielding ground wire of the cable needs to be led out from the cable compartment to pass through the zero-sequence current transformer under the cabinet, and at the same time, good insulation protection of the ground wire should be done to prevent grounding when it has not passed through the current transformer, which may affect the zero-sequence current measurement and cause incorrect operation of the relay protection and small current grounding line selection device. The corresponding secondary cable of the current transformer also needs to be led to the zero-sequence current transformer under the cabinet. The construction is not standardized and is extremely likely to pose potential safety hazards. Moreover, in some cases, the zero-sequence current transformer cannot be installed inside or under the cabinet. In this case, a split-phase current transformer is used to synthesize the zero-sequence current to replace the zero-sequence current transformer. However, due to the differences in the characteristics of the three-phase current transformers themselves, and the small value of the zero-sequence current and the large transformation ratio of the phase current transformer when a single-phase grounding occurs in the line, the unbalanced current of the three-phase current transformers is large, and it cannot correctly reflect the zero-sequence current of the line and cannot realize the function of grounding line selection.

[0010] 2. The existing exposed installation method of the round-hole current transformer lacks sufficient protection measures and is easily affected by external factors such as vibration, dust, and moisture, which may all affect the stability of its long-term operation.

[0011] 3. The installation process of the existing round-hole current transformer is cumbersome. Since different models and sizes of current transformers need to be equipped with different bases, and the installation of the bases often requires precise hole position adjustment and separate processing, the production efficiency is low. During the assembly process, steps such as perforation and fixing brackets are often required, which not only increases the production cost but also prolongs the assembly time. In addition, after the brackets and bases of some current transformers are damaged, there are no suitable replacement parts, which affects the later maintenance and the continued use of the equipment.

[0012] 4. Although the buckle structure in the existing round-hole current transformer is convenient for quick installation, it may become loose or worn during long-term use, affecting the firmness of the connection. Especially in a high-voltage or vibrating environment, it may lead to a decrease in sealing performance and even leakage. Summary of the Invention

[0013] The object of the present invention is to provide a zero-sequence current transformer, which through a rectangular opening and closing design, combines an innovative modular structure and an integrated base, achieving efficient, stable, and reliable zero-sequence current measurement and protection functions.

[0014] To achieve the above object, the present invention provides the following technical solution: A zero-sequence current transformer includes a transformer module and an integrated base, wherein:

[0015] The transformer module is an opening and closing type zero-sequence current transformer. The transformer module has a combined front component, a rear component, and angle iron pieces for locking the front component and the rear component. Among them, both the front component and the rear component are U-shaped iron core structures and are arranged in a mirror image. An activity bar is arranged on the front side of the front component and the rear component. The angle iron pieces are distributed on the outer sides of the front component and the rear component and are locked by bolts between them. A rectangular iron core channel is formed between the front component and the rear component;

[0016] The integrated base is used to lock and install the transformer module and provide protection. The integrated base includes a bottom frame seat, a protective outer frame, and a locking structure. Among them, installation edges are arranged on both sides of the bottom of the bottom frame seat. An opening is provided on the top surface of the bottom frame seat. Through holes that communicate with each other are provided on both sides of the top of the bottom frame seat. Adjustment long holes are provided on the side edges of the front and rear ends of the bottom frame seat.

[0017] Preferably, the transformer module is of an opening and closing design, having a front component and a rear component, which are locked and connected by angle iron pieces. Specifically, both the front component and the rear component are U-shaped iron core structures, arranged in a mirror image, which is convenient for inducting and processing current. Activity bars are arranged on the front sides of the upper and rear components for adjusting the gap during installation to adapt to different types of current test environments; the angle iron pieces surround the outer periphery of the transformer module and are fastened by bolts to ensure the stability and accuracy of the module structure.

[0018] Preferably, the protective outer frame includes an upper frame and a lower frame distributed up and down. Among them, the lower frame is in a shape that matches the inner side of the opening of the bottom frame seat. The bottom of the lower frame extends into the inner side of the bottom frame seat from the opening. Adjusting screws that pass through the adjustment long holes and can be limited and locked are arranged at the front and rear ends of the lower frame.

[0019] Preferably, a vertical groove body and a horizontal groove body are provided on the lower frame. Among them, the inner side of the horizontal groove body is matched with the outer side surfaces of the front component and the rear component.

[0020] Preferably, long sliding holes are provided on both sides of the top of the lower frame. The two ends of the bottom of the upper frame extend into the inner side of the vertical groove body and are limited and locked by bolts.

[0021] Preferably, a groove that matches the top end of the front component is provided on the top of the upper frame. Long sliding holes are provided at both ends of the bottom of the upper frame that extends into the inner side of the long sliding holes. Among them, through holes are provided on the side close to the rear component of the long sliding holes. The connecting ends of the angle iron pieces at both ends of the rear component extend into the through holes. Spring pins for limiting the connecting ends are provided in the through holes.

[0022] Preferably, the locking structure is disposed at the open bottom side of the lower frame. The locking structure includes a mounting plate, a housing, a driving rod, a worm, a worm gear, a screw rod, a guide rod, an adjusting arm and a locking press block. The mounting plate is fixedly installed at the bottom of the housing. A mutually matched worm and worm gear are installed inside the housing. One side of the end of the worm shaft is connected to the driving rod, and a screw rod is connected to the center side of the worm gear.

[0023] Preferably, the guide rod and the screw rod are distributed in parallel up and down. The adjusting arm is sleeved on the guide rod and the screw rod. An arc-shaped locking press block is installed at the upper end of the adjusting arm. The two locking press blocks act with the driving rod and clamp the bottom side of the rear assembly.

[0024] Preferably, the locking structure is located at the open bottom side of the lower frame, which can ensure the fixation and stability of the current transformer module after installation. The design of the worm and worm gear makes the adjustment more precise. The adjusting arm and the locking press block can effectively clamp the bottom side of the rear assembly under the action of the driving rod, preventing the current transformer module from loosening due to external vibration or impact during operation.

[0025] Preferably, the locking structure adopts the design of the worm and worm gear, which makes the adjustment more accurate and can realize the effective clamping of the bottom side of the rear assembly. Through the cooperation of the adjusting arm and the locking press block, the position of the rear assembly can be accurately controlled to ensure the stability and firmness of the current transformer module; in addition, through the action of the driving rod, the locking press block can clamp the rear assembly to ensure the stability of the current transformer module after installation, avoiding loosening due to external vibration or impact during operation, thereby improving the long-term reliability of the equipment; moreover, the locking structure is combined with the protective outer frame to provide comprehensive protection for the current transformer module. The structural design is reasonable and can effectively prevent the current transformer from being impacted or interfered by the outside world during use, ensuring its normal operation.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] The zero-sequence current transformer of the present invention adopts a rectangular opening and closing design, combines an innovative modular structure and an integrated base, and realizes efficient, stable and reliable zero-sequence current measurement and protection functions; in addition, the rectangular opening and closing design is adopted to solve the problem of unbalanced current in the normal operation of the zero-sequence current formed by three-phase CTs, and solve the problem that the original round-hole type zero-sequence current transformer cannot be installed in the case of single-core cables, large-section cables, double cables, etc. At the same time, it ensures that the accuracy and saturation multiple of the zero-sequence current transformer meet the use requirements, and it is more suitable for large-section single-core cables and two cables connected in parallel.

[0028] Quick installation and maintenance: The upper and rear components of the current transformer module are locked by angle iron parts and bolts. The bolt fastening method ensures the stability and accuracy of the structure. This design simplifies the installation process, saves time and cost, and improves the production and maintenance efficiency.

[0029] Enhanced protection and stability: The integrated base, combined with the protective outer frame, provides effective protection measures, avoiding the influence of external factors such as vibration, dust, and moisture. Even in harsh environments, the current transformer can operate stably, ensuring long-term reliability.

[0030] Strong adaptability: The front sides of the upper and rear components are provided with movable bars, which can flexibly adjust the gap according to the installation environment. This design enables the current transformer to be widely applied in various power systems, solving the limitations of traditional current transformers in current detection.

[0031] Efficient locking structure: The locking structure in the integrated base adopts a worm and worm gear design, which can accurately adjust and ensure the firm fixation of the current transformer module, preventing loosening or leakage caused by external vibration or impact. This design improves the safety of equipment use and reduces the possibility of failures.

[0032] Improved convenience in installation and disassembly: The design of the protective outer frame combines structures such as long sliding holes and screws that are easy to install, making the assembly and disassembly process of the current transformer module more convenient, reducing the requirement for precise adjustment of the base during the assembly process, and improving work efficiency. Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 It is a schematic diagram of the structure of the current transformer module in the embodiment of the present invention;

[0035] Figure 3 It is a schematic diagram of the structure of the integrated base in the embodiment of the present invention;

[0036] Figure 4 It is a schematic diagram of the locking structure in the embodiment of the present invention Figure 1 ;

[0037] Figure 5 It is a schematic diagram of the locking structure in the embodiment of the present invention Figure 2 。

[0038] In the figure:

[0039] 1. Current transformer module; 101. Front component; 102. Rear component; 103. Angle iron part; 104. Movable bar;

[0040] 2. Integrated base; 201. Bottom frame seat; 202. Upper frame; 203. Lower frame; 204. Groove; 205. Installation plate; 206. Shell; 207. Driving rod; 208. Screw rod; 209. Worm gear; 210. Guide rod; 211. Adjusting arm; 212. Locking pressure block; 213. Worm. Detailed implementation mode

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0043] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] Please refer to Figure 1 , the present invention provides a technical solution: a zero-sequence current transformer, including a transformer module 1 and an integrated base 2.

[0045] Please refer to Figure 1 - Figure 2 , in this embodiment, the transformer module 1 is an open-type zero-sequence current transformer. The transformer module 1 has a combined front component 101, a rear component 102, and an angle iron piece 103 for locking the front component 101 and the rear component 102. Among them, both the front component 101 and the rear component 102 are U-shaped iron core structures and are arranged in a mirror image. An activity bar 104 is arranged on the front sides of the front component 101 and the rear component 102. The angle iron pieces 103 are distributed outside the front component 101 and the rear component 102 and are locked by bolts between them. A rectangular iron core channel is formed between the front component 101 and the rear component 102.

[0046] In this embodiment, the mutual inductor module 1 is of an open-and-close design and has a front component 101 and a rear component 102, which are locked and connected by an angle iron piece 103. Specifically, both the front component 101 and the rear component 102 are U-shaped iron core structures and are arranged in a mirror image, facilitating the induction and processing of current. An activity bar 104 is provided on the front side of the upper and rear components 102 for adjusting the gap during installation to adapt to different types of current test environments. The angle iron piece 103 surrounds the outer periphery of the mutual inductor module 1 and is fastened by bolts to ensure the stability and accuracy of the module structure.

[0047] Please refer to Figure 1 、 Figure 3 , in this embodiment, the integrated base 2 is used to lock and install the mutual inductor module 1 and provide protection. The integrated base 2 includes a bottom frame base 201, a protective outer frame and a locking structure. Installation edges are provided on both sides of the bottom of the bottom frame base 201. An opening is provided on the top surface of the bottom frame base 201. Through holes communicating with each other are provided on both sides of the top of the bottom frame base 201. Adjustment long holes are provided on the side edges of the front and rear ends of the bottom frame base 201; the protective outer frame includes an upper frame 202 and a lower frame 203 distributed vertically. The lower frame 203 is in a shape that matches the inner side of the opening of the bottom frame base 201. The bottom of the lower frame 203 extends into the inner side of the bottom frame base 201 from the opening. Adjusting screws that pass through the adjustment long holes and can be limited and locked are provided at the front and rear ends of the lower frame 203; vertical groove bodies and horizontal groove bodies are provided on the lower frame 203. The inner side of the horizontal groove body cooperates with the outer side surfaces of the front component 101 and the rear component 102; long sliding holes are provided on both sides of the top of the lower frame 203. The two ends of the bottom of the upper frame 202 extend into the inner side of the vertical groove body and are limited and locked by bolts; a groove 204 that matches the top end of the front component 101 is provided on the top of the upper frame 202. Long sliding holes are provided at both ends of the bottom of the upper frame 202 extending into the inner side of the long sliding holes. A through hole is provided on the side of the long sliding hole close to the rear component 102. The connecting ends of the angle iron pieces 103 at both ends of the rear component 102 extend into the through hole. A spring pin (not shown in the figure) for limiting the connecting end is provided in the through hole.

[0048] In this embodiment, the integrated base 2 is composed of a bottom frame base 201, a protective outer frame and a locking structure, making the installation and protection of the mutual inductor more convenient and safe in design. Installation edges are provided on both sides of the bottom frame base 201, facilitating docking with the installation interface of the device. An opening is provided on the top surface of the bottom frame base 201, facilitating the fitting of the mutual inductor module 1 with the base. The design of the adjustment long holes and through holes provides a flexible installation space, capable of adapting to the installation requirements of mutual inductors of different models and sizes.

[0049] In this embodiment, the protective outer frame of the integrated base 2 is composed of upper and lower parts. The upper frame 202 and the lower frame 203 are locked by chutes and bolts, and can fix the entire transformer module 1. A groove body is provided in the lower frame 203, and a plurality of groove designs match the arc shape of the outer periphery of the rear component 102 to ensure the stable embedding of the transformer module 1.

[0050] Please refer to Figure 3 - Figure 5 , in this embodiment, the locking structure is arranged on the open bottom side of the lower frame 203. The locking structure includes a mounting plate 205, a housing 206, a driving rod 207, a worm 213, a worm gear 209, a screw 208, a guide rod 210, an adjusting arm 211 and a locking block 212. The bottom of the housing 206 is fixedly provided with the mounting plate 205, and a mutually matched worm 213 and worm gear 209 are installed inside the housing 206. One side of the shaft end of the worm 213 is connected to the driving rod 207, and a screw 208 is connected to the center side of the worm gear 209; the guide rod 210 and the screw 208 are distributed in parallel up and down. The adjusting arm 211 is sleeved on the guide rod 210 and the screw 208. An arc-shaped locking block 212 is installed at the upper end of the adjusting arm 211. The two locking blocks 212 act with the driving rod 207 and clamp the bottom side of the rear component 102.

[0051] In this embodiment, the locking structure is located at the open bottom side of the lower frame 203, which can ensure the fixing and stability of the transformer module 1 after installation. The design of the worm gear 209 and the worm 213 enables more precise adjustment. The adjusting arm 211 and the locking block 212 can effectively clamp the bottom side of the rear component 102 under the action of the driving rod 207, preventing the transformer module 1 from loosening due to external vibration or impact during operation.

[0052] In this embodiment, the locking structure adopts the design of the worm gear 209 and the worm 213, which enables more precise adjustment and can effectively clamp the bottom side of the rear component 102. Through the cooperation of the adjusting arm 211 and the locking block 212, the position of the rear component 102 can be precisely controlled to ensure the stability and firmness of the transformer module 1; in addition, through the action of the driving rod 207, the locking block 212 can clamp the rear component 102 to ensure the stability of the transformer module 1 after installation, avoiding loosening caused by external vibration or impact during operation, thereby improving the long-term reliability of the equipment; moreover, the locking structure is combined with the protective outer frame to provide comprehensive protection for the transformer module 1. The structural design is reasonable and can effectively prevent the transformer from being impacted or interfered by the outside world during use, ensuring its normal operation.

[0053] In this embodiment, the design of the locking structure allows for the diversified installation of the transformer module 1 and the integrated base, adapts to transformers of different models and sizes, provides greater installation flexibility, and meets the requirements of different current test environments.

[0054] This embodiment also provides the installation and application steps of the above zero-sequence current transformer:

[0055] Preparation work: Before starting to install the zero-sequence current transformer, first ensure that the power supply of the power equipment has been cut off to ensure the safety of the operator. Check that the model of the transformer used matches the specifications of the power system, and ensure that the operating current range of the zero-sequence current transformer is applicable to the target system;

[0056] Disassemble and prepare the transformer: Connect the upper and rear components 102 of the transformer as needed to ensure that the base is fully docked with the transformer module 1;

[0057] Adjust the movable bar 104: According to the actual size and layout of the cable in the power system, use the adjustment screw to adjust the movable bar 104 on the front side of the transformer to ensure that the transformer module 1 can be successfully installed in the target position and adapt to the test requirements of different cables or currents;

[0058] Fix the transformer: Use bolts to firmly lock the upper and rear components 102 of the transformer. Through the method of bolt fastening, ensure that the transformer is firmly installed and will not loosen due to the movement of the cable or external vibration,

[0059] Adjust the locking structure: Check the locking structure in the integrated base 2 to ensure that the worm gear 209 and worm 213 device have fully locked the transformer module 1, making it stable and able to maintain stability during long-term use;

[0060] Install the transformer: Place the transformer module 1 accurately in the appropriate position of the cable. As needed, you can choose to install the transformer at the cable gathering point or in the cable room. When the cable passes through the aperture of the transformer, ensure that the cable is not twisted or damaged during the passing process;

[0061] Connect to the power system: After completing the installation of the transformer, connect the transformer to the power protection and monitoring system through appropriate cables. Adjust the current signal output interface according to the required monitoring range;

[0062] Start the system and test: Start the power equipment, ensure that the zero-sequence current transformer is working properly, monitor the output of the current signal, and conduct relevant parameter tests to ensure that the equipment is within the normal operating range and can accurately reflect the zero-sequence current status;

[0063] Maintenance and inspection: Regularly check the operation of the zero-sequence current transformer, including checking the integrity of the buckle structure, bolt locking, and protective outer frame. In a harsh environment, regular cleaning and maintenance should be carried out according to the actual situation to ensure stability during long-term use.

[0064] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A zero-sequence current transformer, characterized in that: It comprises a transformer module (1) and an integrated base (2), wherein: The transformer module (1) is a split-type zero-sequence current transformer. The transformer module (1) comprises a front component (101), a rear component (102) and an angle iron piece (103) for locking the front component (101) and the rear component (102), wherein the front component (101) and the rear component (102) are both U-shaped iron core joints and are arranged in a mirror image. A movable bar (104) is arranged on the front side of the front component (101) and the rear component (102). The angle iron piece (103) is distributed on the outside of the front component (101) and the rear component (102) and is locked by bolts. A rectangular iron core channel is formed between the front component (101) and the rear component (102). The integrated base (2) is used to lock and install the transformer module (1) and provide protection. The integrated base (2) comprises a base frame (201), a protective outer frame and a locking structure, wherein installation edges are arranged on both sides of the bottom of the base frame (201), an opening is arranged on the top surface of the base frame (201), through holes are arranged on both sides of the top of the base frame (201), and adjustment long holes are arranged on the sides of the front and rear ends of the base frame (201); the protective outer frame comprises an upper frame (202) and a lower frame (203) which are arranged in an upper and lower manner, wherein the lower frame (203) is in a shape that matches the inner side of the opening of the base frame (201), the bottom of the lower frame (203) extends into the inner side of the base frame (201) through the opening, and the lower frame (203) ) are provided with adjustment screws passing through the adjustment long holes and capable of being limited and locked at the front and rear ends; the locking structure is arranged on the bottom side of the opening of the lower frame (203), and the locking structure comprises a mounting plate (205), a housing (206), a driving rod (207), a worm (213), a worm wheel (209), a screw (208), a guide rod (210), an adjustment arm (211) and a locking pressing block (212), wherein the mounting plate (205) is fixed at the bottom of the housing (206); a worm (213) and a worm wheel (209) which are matched with each other are installed on the inner side of the housing (206), wherein one side of the shaft end of the worm (213) is connected to the driving rod (207), and the shaft center side of the worm wheel (209) is connected to the screw (208).

2. A zero-sequence current transformer according to claim 1, characterized in that: The lower frame (203) is provided with a vertical slot body and a horizontal slot body, wherein the inner side of the horizontal slot body cooperates with the outer side surfaces of the front component (101) and the rear component (102).

3. A zero-sequence current transformer according to claim 1, characterized in that: Long sliding holes are provided on both sides of the top of the lower frame (203), and both ends of the bottom of the upper frame (202) extend into the inner side of the vertical slot body and are locked by bolts.

4. A zero-sequence current transformer according to claim 1, characterized in that: The top of the upper frame (202) is provided with a groove (204) that matches the top of the front component (101).

5. A zero-sequence current transformer according to claim 1, characterized in that: The guide rod (210) and the screw rod (208) are arranged in parallel at the top and bottom. The adjusting arm (211) is sleeved on the guide rod (210) and the screw rod (208). An arc-shaped locking block (212) is installed on the upper end of the adjusting arm (211). The two locking blocks (212) move with the driving rod (207) and clamp the bottom side of the rear assembly (102).

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