Open type current transformer for power distribution switch cabinet

Abstract

The application discloses an open type current transformer for power distribution switch cabinet, and relates to the technical field of power transformers. In view of the problem that the existing open type current transformer is prone to reduced induction accuracy after installation, the following scheme is provided, which comprises an installation plate, a first shell and a second shell are hingedly connected on the installation plate, and the first shell and the second shell are fixedly connected on the opposite side. Two cores are mutually symmetrical. The open type current transformer for power distribution switch cabinet disclosed by the application can be quickly installed outside the bus bar in an opening and closing mode without the need of breaking power supply and removing the bus bar, thereby affecting the power supply continuity of the power distribution switch cabinet. Meanwhile, the position of the core is adjusted, so that the geometric center of the transformer coincides with the bus bar, the uneven distribution of the magnetic circuit after the two cores are closed due to eccentricity is avoided, the magnetic flux density at the core joint surface is deviated, and the induction accuracy of the open type current transformer is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of power transformer technology, and more particularly to an open-type current transformer for power distribution switchgear. Background Technology

[0002] In the manufacturing industries of intelligent large-scale DC converter transformers, intelligent reactors, and other transformers, rectifiers, and inductors, as well as the smart grid industry, current sensors are detection elements that convert the current in a conductor into a measurable voltage or digital signal, and are the core of circuit monitoring. Their working principle is mainly based on three types of physical effects: shunts utilize Ohm's law to measure current through the voltage drop across resistance; the Hall effect senses a magnetic field; and electromagnetic induction is only applicable to AC measurements.

[0003] The width specifications of busbars in switchgear vary, while the inner diameter of existing open-type current transformers is usually designed with a fixed size. Due to the installation position of the cable or busbar and the natural sag of the transformer under gravity, an uneven gap will form between the inner wall of the inner hole and the surface of the cable or busbar. This causes the geometric center of the transformer to not coincide with the geometric center of the cable or busbar cross-section, i.e., an eccentric state. This eccentricity directly leads to uneven magnetic circuit distribution after the two semi-annular iron cores are closed, and the magnetic flux density at the iron core joint surface will deviate, which in turn causes a serious decrease in the induction accuracy of the current transformer. Summary of the Invention

[0004] This invention discloses an open-type current transformer for power distribution switchgear, aiming to solve the technical problem that existing open-type current transformers are prone to a decrease in sensing accuracy after installation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An open-type current transformer for a power distribution switchgear includes:

[0007] Mounting plate, on which a first housing and a second housing are hinged, and the opposite sides of the first housing and the second housing are fixedly connected;

[0008] Two iron cores, symmetrical to each other, both iron cores are located between the first shell and the second shell, and the outside of each iron core is provided with windings and flame-retardant epoxy resin encapsulation layer.

[0009] Two fixing frames are respectively set on the outside of the two flame-retardant epoxy resin encapsulation layers;

[0010] A floating centering module is located outside two fixed frames. The floating centering module includes multiple arc-shaped frames and arc plates, and multiple springs are arranged between the arc-shaped frames and the arc plates.

[0011] The self-compensating locking module is located outside the two fixed frames. The self-compensating locking module includes a fixed boss and a movable boss, and the fixed boss and the movable boss are provided with the same hollow rod.

[0012] In a preferred embodiment, it also includes:

[0013] A heat insulation plate is disposed on the upper side of the mounting plate and is located between the first housing and the second housing;

[0014] Two support bases, each of which is movably connected to two rotating frames. Each rotating frame has a circular opening. Each of the two support bases has two positioning pins inserted into it. The outer side of each positioning pin is inserted into the inner wall of the circular opening on the same side.

[0015] Two mating plates are respectively set on two fixed frames, and the opposite sides of the two mating plates are attached together.

[0016] The floating alignment module also includes:

[0017] Multiple concave arc-shaped components are respectively set on the outside of multiple arc-shaped frames, and the outside of multiple rotating frames is fixedly connected to the outside of multiple arc plates. The outside of the arc-shaped frames is fixedly connected to the outside of the fixed frame on the same side.

[0018] Two carbon fiber lines are respectively set on the outside of two concave arc-shaped parts on the same side;

[0019] Multiple curved slide rails are respectively set on the outside of multiple arc plates, and the same movable platform is slidably connected to two curved slide rails on the same side.

[0020] Multiple curved surface components are respectively set on the outside of multiple arc plates, and multiple socket holes are opened on each curved surface component.

[0021] The floating alignment module also includes:

[0022] Two limiting members are respectively set on two movable platforms. One end of each limiting member is inserted into the inner wall of the socket on the same side, and a spring is provided on the end of each limiting member away from the socket.

[0023] An integrated plate, the bottom of which is fixedly connected to the upper sides of the two movable platforms;

[0024] Multiple extension frames are provided on the upper side of the integrated plate. Each extension frame is equipped with a guide roller, and the outer side of each guide roller is in contact with the outer side of the carbon fiber line on the same side.

[0025] A bidirectional lead screw is provided above the integrated plate. The bidirectional lead screw has two symmetrical protrusions on its outer side, and the bottom of each protrusion is fixedly connected to the upper side of the integrated plate.

[0026] Two movable blocks are located outside the bidirectional lead screw. The two movable blocks are slidably connected to the same slide rail, and the bottom of the slide rail is fixedly connected to the upper side of the integrated plate.

[0027] The floating alignment module also includes:

[0028] Multiple round rods are fixedly connected to the outside of a movable block on the same side, and each round rod has an annular groove.

[0029] Multiple retaining rings are fixedly connected to the two ends of two carbon fiber wires respectively, and the retaining rings are all set on the outside of the annular groove on the same side;

[0030] The knob is located on the outside of the bidirectional lead screw;

[0031] Two limiting plates are respectively set on two moving blocks. A rectangular groove is opened on the upper side of each moving block. A thin rod is set in the rectangular groove. The outside of the thin rod is movably connected to the limiting plate on the same side. An elastic spring is fixedly connected to the inner wall of the rectangular groove. The other end of the elastic spring is fixedly connected to the outside of the limiting plate on the same side.

[0032] Two stops are provided, with the bottom of each stop fixedly connected to the inner wall of the bottom of the rectangular groove, and the outer side of each stop contacting the side of the limiting plate away from the elastic spring.

[0033] The floating alignment module also includes:

[0034] An isolation frame, the bottom of which is fixedly connected to the upper side of the integrated plate;

[0035] Two racks are respectively set on the inner wall of the isolation frame, and the outside of the two limiting plates are engaged with the racks on the same side.

[0036] In a preferred embodiment, the self-compensating locking module further includes:

[0037] A sliding groove is provided on a mating plate on the same side as the movable boss, and the inner wall of the sliding groove is slidably connected to the outer side of the movable boss.

[0038] The airbag is located outside the movable boss. A groove is opened on the docking plate on the same side as the movable boss. The inner wall of the groove fits the outside of the airbag. The bottom of the airbag is in contact with the outside of two flame-retardant epoxy resin encapsulation layers.

[0039] A guide frame is disposed outside the airbag, and the bottom of the guide frame is fixedly connected to the upper side of the docking plate on the same side.

[0040] A limiting ring is provided on the outside of the hollow rod, and the outside of the limiting ring is engaged with the outside of the movable boss.

[0041] The self-compensating locking module also includes:

[0042] A conical rod is inserted into the inner wall of a hollow rod. An annular frame is fixedly connected to the outside of the conical rod. Two L-shaped grooves are opened on the annular frame and are equidistant from each other. A short shaft is snapped into each L-shaped groove. The short shaft is fixedly connected to the opposite side of the outside of the conical rod.

[0043] A short rod is disposed outside the conical rod. A guide frame is slidably connected to the outside of the short rod, and the guide frame is fixedly connected to the opposite side of the outer side of the annular frame.

[0044] The self-compensating locking module also includes:

[0045] Spring three is wrapped around the short rod. One end of spring three is fixedly connected to the outside of the conical rod, and the other end of spring three is fixedly connected to the outside of the guide frame.

[0046] The self-compensating locking module also includes:

[0047] Two pre-reserved slots are provided, both of which are opened on the inner wall of the hollow rod. Locking blocks are slidably connected in each pre-reserved slot, and the outside of the locking blocks is in contact with the outside of the conical rod.

[0048] Two springs are provided inside the hollow rod. One end of each spring is fixedly connected to the outside of the locking block on the same side, and the other end of each spring is fixedly connected to the inner wall of the hollow rod.

[0049] As can be seen from the above, the open-type current transformer for power distribution switchgear provided by the present invention enables the device to be quickly installed outside the busbar without disconnecting the power supply and affecting the continuity of the power supply of the power distribution switchgear. At the same time, by adjusting the position of the iron core, the geometric center of the transformer is made to coincide with the geometric center of the busbar, avoiding the uneven magnetic circuit distribution after the two iron cores are closed due to eccentricity, and the deviation of the magnetic flux density at the iron core joint surface. This significantly improves the induction accuracy of the open-type current transformer. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the overall structure of an open-type current transformer for a power distribution switchgear proposed in this invention.

[0051] Figure 2This is a schematic diagram of the internal structure of an open-type current transformer for a power distribution switchgear proposed in this invention.

[0052] Figure 3 This is a schematic diagram of the fixed frame structure of an open-type current transformer for a power distribution switchgear proposed in this invention.

[0053] Figure 4 This is a schematic diagram of the core structure of an open-type current transformer for a power distribution switchgear proposed in this invention.

[0054] Figure 5 This is a schematic diagram of the arc-shaped frame structure of an open-type current transformer for power distribution switchgear proposed in this invention.

[0055] Figure 6 This is a schematic diagram of the movable platform structure of an open-type current transformer for a power distribution switchgear proposed in this invention.

[0056] Figure 7 This is a schematic diagram of the integrated plate structure of an open-type current transformer for a power distribution switchgear proposed in this invention.

[0057] Figure 8 This is a schematic diagram of the self-compensation locking module structure of an open-type current transformer for power distribution switchgear proposed in this invention.

[0058] Figure 9 This is a schematic diagram of the hollow rod structure of an open-type current transformer for a power distribution switchgear proposed in this invention.

[0059] Figure 10 This is a schematic diagram of the locking block structure of an open-type current transformer for a power distribution switchgear proposed in this invention.

[0060] In the diagram: 1. Mounting plate; 2. First housing; 3. Second housing; 4. Heat insulation plate; 5. Flame-retardant epoxy resin encapsulation layer; 6. Fixing frame; 7. Support base; 8. Floating centering module; 801. Arc frame; 802. Concave arc component; 803. Arc plate; 804. Spring one; 805. Curved slide rail; 806. Movable platform; 807. Curved component; 808. Socket hole; 809. Limiting component; 810. Spring two; 811. Integrated plate; 812. Carbon fiber wire; 813. Fixing ring; 814. Two-way lead screw; 815. Knob; 816. Moving block; 817. Slide rail; 818. Round rod; 819. Extension frame; 820. 821. Guide roller; 822. Limiting plate; 823. Elastic spring; 824. Isolation frame; 825. Rack; 826. Stop block; 9. Self-compensating locking module; 901. Fixed boss; 902. Movable boss; 903. Hollow rod; 904. Slide groove; 905. Guide frame; 906. Airbag; 907. Conical rod; 908. Limiting ring; 909. Annular frame; 910. L-shaped groove; 911. Short shaft; 912. Short rod; 913. Guide frame; 914. Spring three; 915. Locking block; 916. Spring four; 917. Reserved slot; 10. Rotating frame; 11. Positioning pin; 12. Iron core; 13. Winding; 14. Connecting plate. Detailed Implementation

[0061] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0062] The open-type current transformer for power distribution switchgear disclosed in this invention is mainly applied to scenarios where the sensing accuracy of existing open-type current transformers tends to decrease after installation.

[0063] Reference Figures 1-10 An open-type current transformer for power distribution switchgear includes:

[0064] Mounting plate 1, on which a first housing 2 and a second housing 3 are hinged, and the opposite sides of the first housing 2 and the second housing 3 are connected by bolts;

[0065] Two iron cores 12 are symmetrical to each other and are located between the first housing 2 and the second housing 3. The outer side of each iron core 12 is provided with a winding 13 and a flame-retardant epoxy resin encapsulation layer 5.

[0066] Two fixing frames 6 are respectively set on the outside of the two flame-retardant epoxy resin encapsulation layers 5;

[0067] The floating centering module 8 is located outside the two fixed frames 6. The floating centering module 8 includes multiple arc frames 801 and arc plates 803. Multiple springs 804 are provided between the arc frames 801 and the arc plates 803.

[0068] The self-compensating locking module 9 is located outside the two fixed frames 6. The self-compensating locking module 9 includes a fixed boss 901 and a movable boss 902. The fixed boss 901 and the movable boss 902 are provided with the same hollow rod 903.

[0069] Specifically, the device utilizes a self-compensating locking module 9, enabling it to be quickly installed outside the busbar without disconnecting the power supply and affecting the continuity of the power supply to the distribution switchgear. Simultaneously, by adjusting the position of the iron core 12, the geometric center of the current transformer is made to coincide with the geometric center of the busbar, avoiding the uneven magnetic circuit distribution caused by eccentricity after the two iron cores 12 are closed, and the deviation in magnetic flux density at the joint surface of the iron cores 12. This significantly improves the induction accuracy of the open-type current transformer.

[0070] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In a preferred embodiment, it further includes:

[0071] Heat insulation plate 4 is disposed on the upper side of mounting plate 1 and is located between the first housing 2 and the second housing 3;

[0072] Two support bases 7, each of which is rotatably connected to two rotating frames 10 via bearings. Each rotating frame 10 has a round opening. Two positioning pins 11 are inserted into each of the two support bases 7. The outside of each positioning pin 11 is inserted into the inner wall of the round opening on the same side.

[0073] Two mating plates 14 are respectively set on two fixed frames 6, and the opposite sides of the two mating plates 14 are attached together.

[0074] Floating centering module 8 also includes:

[0075] Multiple concave arc-shaped parts 802 are respectively disposed on the outside of multiple arc-shaped frames 801, and the outside of multiple rotating frames 10 is respectively connected to the outside of multiple arc plates 803 by bolts. The outside of the arc-shaped frames 801 is connected to the outside of the fixed frame 6 on the same side by bolts.

[0076] Two carbon fiber lines 812 are respectively disposed on the outside of two concave arc-shaped parts 802 on the same side;

[0077] Multiple curved slide rails 805 are respectively set on the outside of multiple arc plates 803, and the same movable table 806 is slidably connected to two curved slide rails 805 on the same side.

[0078] Multiple curved surface components 807 are respectively disposed on the outside of multiple arc plates 803, and multiple socket holes 808 are provided on each curved surface component 807.

[0079] Floating centering module 8 also includes:

[0080] Two limiting members 809 are respectively set on two movable platforms 806. One end of each limiting member 809 is inserted into the inner wall of the socket 808 on the same side, and a spring 810 is set on the end of each limiting member 809 away from the socket 808.

[0081] The bottom of the integrated plate 811 is connected to the upper side of the two movable platforms 806 by bolts.

[0082] Multiple extension frames 819 are provided on the upper side of the integrated plate 811. Each extension frame 819 is provided with a guide roller 820 on its exterior. The exterior of each guide roller 820 is in contact with the exterior of the carbon fiber line 812 on the same side.

[0083] A two-way lead screw 814 is disposed above the integrated plate 811. Two symmetrical protrusions are provided on the outside of the two-way lead screw 814, and the bottom of the protrusions is connected to the upper side of the integrated plate 811 by bolts.

[0084] Two movable blocks 816 are located outside the bidirectional lead screw 814. The two movable blocks 816 are slidably connected to the same slide rail 817. The bottom of the slide rail 817 is bolted to the upper side of the integrated plate 811.

[0085] Floating centering module 8 also includes:

[0086] Multiple round rods 818 are connected to the outside of the movable block 816 on the same side by bolts. Each round rod 818 has an annular groove.

[0087] Multiple retaining rings 813 are provided, and the outer sides of the multiple retaining rings 813 are respectively connected to the two ends of the two carbon fiber lines 812 by bolts. The retaining rings 813 are all located on the outside of the annular groove on the same side.

[0088] Knob 815, knob 815 is located on the outside of the bidirectional lead screw 814;

[0089] Two limiting plates 821 are respectively set on two moving blocks 816. A rectangular groove is opened on the upper side of each of the two moving blocks 816. A thin rod is set in each rectangular groove. The outside of the thin rod is rotatably connected to the limiting plate 821 on the same side through a bearing. The inner wall of each rectangular groove is connected to an elastic spring 822 by bolts. The other end of the elastic spring 822 is connected to the outside of the limiting plate 821 on the same side by bolts.

[0090] Two stops 825, the bottom of both stops 825 are bolted to the bottom inner wall of the rectangular groove, and the outside of the stops 825 contacts the side of the limiting plate 821 away from the elastic spring 822.

[0091] Floating centering module 8 also includes:

[0092] The bottom of the isolation frame 823 is connected to the upper side of the integrated plate 811 by bolts;

[0093] Two racks 824 are respectively set on the inner wall of the isolation frame 823, and the outer sides of the two limiting plates 821 are engaged with the racks 824 on the same side.

[0094] In specific application scenarios, the floating alignment module 8 is mainly used in the floating alignment stage of the floating alignment process. Specifically, the floating alignment module 8 slides along the curved slide rail 805 via the movable table 806, ensuring that the center point of the arc frame 801 precisely aligns with the center point of the busbar. This, combined with the bidirectional lead screw 814 driving the carbon fiber wire 812 for synchronous adjustment, completely overcomes the eccentric sag caused by the weight of the iron core 12, ensuring magnetic circuit symmetry and eliminating errors in ratio and angle from the source, providing structural assurance for high-precision measurement. After alignment is completed, the limiting plate 821 is engaged with the elastic spring 822. When reset, the unidirectional engagement with the rack 824 prevents the moving block 816 from retracting due to the continuous reaction force on the carbon fiber wire 812, thus forming a mechanical self-lock. At the same time, the self-locking characteristic of the bidirectional lead screw 814 further prevents vibration-induced loosening. This locking mechanism requires no external energy and maintains the alignment state during long-term operation, effectively resisting the interference of busbar short-circuit electrodynamics and thermal expansion and contraction. All adjustment components are integrated inside the fixed frame 6 and support base 7, without increasing the external size of the current transformer. It is compatible with rectangular busbars of various widths in the switch cabinet, significantly improving the product's versatility.

[0095] Reference Figure 8 , Figure 9 and Figure 10 In a preferred embodiment, the self-compensating locking module 9 further includes:

[0096] The slide groove 904 is disposed on the mating plate 14 on the same side as the movable boss 902, and the inner wall of the slide groove 904 is slidably connected to the outer side of the movable boss 902.

[0097] Airbag 906 is located outside the movable boss 902. A groove is provided on the docking plate 14 on the same side as the movable boss 902. The inner wall of the groove fits the outside of the airbag 906. The bottom of the airbag 906 is in contact with the outside of the two flame-retardant epoxy resin encapsulation layers 5.

[0098] Guide frame 905 is set outside airbag 906, and the bottom of guide frame 905 is connected to the upper side of docking plate 14 on the same side by bolts.

[0099] The limiting ring 908 is located outside the hollow rod 903, and the outside of the limiting ring 908 is engaged with the outside of the movable boss 902.

[0100] The self-compensating locking module 9 also includes:

[0101] A conical rod 907 is inserted into the inner wall of a hollow rod 903. An annular frame 909 is bolted to the outside of the conical rod 907. Two L-shaped grooves 910 are circumferentially distributed on the annular frame 909. A short shaft 911 is engaged in each L-shaped groove 910. The short shafts 911 are bolted to the opposite side of the outside of the conical rod 907.

[0102] Short rod 912 is located outside the conical rod 907. A guide frame 913 is slidably connected to the outside of the short rod 912, and the guide frame 913 and the opposite side of the outer side of the annular frame 909 are connected by bolts.

[0103] The self-compensating locking module 9 also includes:

[0104] Spring 3 914 surrounds short rod 912. One end of spring 3 914 is bolted to the outside of cone rod 907, and the other end of spring 3 914 is bolted to the outside of guide frame 913.

[0105] The self-compensating locking module 9 also includes:

[0106] Two reserved slots 917 are opened on the inner wall of the hollow rod 903. Locking blocks 915 are slidably connected in each reserved slot 917. The outside of the locking blocks 915 is in contact with the outside of the cone rod 907.

[0107] Two springs 916 are installed inside the hollow rod 903. One end of each spring 916 is bolted to the outside of the locking block 915 on the same side, and the other end of each spring 916 is bolted to the inner wall of the hollow rod 903.

[0108] In specific application scenarios, the self-compensating locking module 9 is mainly used in the self-compensating locking process. That is, the self-compensating locking module 9 utilizes the insertion and cooperation of the hollow rod 903 and the conical rod 907, and works with the short rod 912 to drive the short shaft 911 to be inserted into the L-shaped groove 910 to achieve quick locking with one insertion and one rotation. The operation is simple. The double limiting structure of the limiting ring 908 and the locking block 915 effectively prevents the lock from loosening due to operating vibration and improves long-term operating stability. During operation, the airbag 906 expands after the heat is transferred from the winding 13 and the busbar, and automatically pushes the movable boss 902 to move slightly along the slide groove 904, providing continuous flexible tightening force for the two fixed frames 6. It compensates for the gap caused by thermal expansion and contraction and mechanical creep in real time, ensuring that the end face of the iron core 12 is always tightly fitted and maintaining the stability of the magnetic circuit. This process is completely passive and self-adaptive, requiring no external intervention, and significantly improves the metering reliability of the current transformer under wide temperature range and large load fluctuation conditions.

[0109] Working principle: When installing the device on the busbar, open the first housing 2 and the second housing 3, rotate the rotating frame 10, causing the rotating frame 10 to drive the flame-retardant epoxy resin encapsulation layer 5 on the fixed frame 6 to wrap the busbar. After the two fixed frames 6 rotate and close, insert the hollow rod 903 into the fixed boss 901 and the movable boss 902, overcoming the elastic force of the spring three 914 to push the short rod 912, so that the conical rod 907 extends into the hollow rod 903. After the conical structure of the conical rod 907 contacts the edge of the locking block 915, the locking block 915 overcomes the elastic force of the spring four 916 and slides outward in the reserved groove 917 of the hollow rod 903, so that the locking block 915, together with the limiting ring 908, locks the fixed boss 901 and the movable boss 902, so that the docking is completed. Plate 14 drives the two fixed frames 6 to remain in a closed state. Rotating the short rod 912 causes the conical rod 907 to drive the short shaft 911 to rotate and enter the L-shaped groove 910. The L-shaped groove 910 locks the short shaft 911, and the conical rod 907 no longer moves. During the operation of the busbar, the iron core 12, which is wound with high magnetic permeability oriented silicon steel strip, and the winding 13 will induce the current in the busbar. When induced, the current generated inside the winding 13 will generate heat. The heat on the busbar and the winding 13 will be transferred to the flame-retardant epoxy resin encapsulation layer 5, so that the airbag 906 in contact with the flame-retardant epoxy resin encapsulation layer 5 will be heated. The air in the airbag 906 will expand due to the heat, so that the airbag 906 will gradually expand, pushing the movable boss 902 to slide slightly in the slide groove 904, thereby providing two The fixed frame 6 provides continuous tightening force, keeping the two iron cores 12 together. The positioning pin 11 is inserted into the circular opening on the rotating frame 10, locking the rotating frame 10 to the support base 7. Two carbon fiber wires 812 are respectively wound around the two concave arc-shaped parts 802 at both ends of the flame-retardant epoxy resin encapsulation layer 5. The fixing rings 813 at both ends of the carbon fiber wires 812 are fitted into the annular grooves on the round rod 818 on the same side. Due to the weight of the iron core 12 and the fixed frame 6, the arc-shaped frame 801 connected to the fixed frame 6 will overcome the elasticity and tension of the spring 804 and move downwards in the arc plate 803 under the influence of weight, thus causing the arc-shaped frame 801 to deviate from the center point of the generatrix. Based on the center point of the arc-shaped frame 801 and the generatrix... The line connecting the center points of the lines overcomes the elastic force of spring 810 to push the limiting member 809, causing the limiting member 809 to release its lock from the socket 808 on the curved surface member 807. This allows the movable table 806 to drive the integrating plate 811 to slide in the curved slide rail 805 with the arc plate 803 as the center. The movable table 806 slides so that the center line of the movable table 806 coincides with the line connecting the center point of the arc frame 801 and the center point of the generatrix. Rotating the knob 815 causes the knob 815 to drive the bidirectional lead screw 814 to rotate, allowing the two moving blocks 816 to move synchronously on the bidirectional lead screw 814. During this process, the limiting plate 821 on the moving block 816 is affected by the movement of the moving block 816, overcomes the elastic force of the elastic spring 822, and deflects after contacting the edge of the rack 824.The movable block 816 can move normally, pulling the carbon fiber line 812, causing the center point of the arc frame 801 to move along the connecting line until it coincides with the center point of the main line. The limiting plate 821 resets under the elastic force of the spring 822. Under the automatic action of the iron core 12, the carbon fiber line 812 experiences a continuous reaction force, causing the arc frame 801 to pull the carbon fiber line 812. Blocked by the stop block 825, the limiting plate 821 cannot deflect in the opposite direction, causing it to engage with the rack 824. The movable block 816 remains in its original position, and the alignment is complete. The first housing 2 and the second housing 3 are then reassembled and secured.

[0110] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An open-type current transformer for power distribution switchgear, characterized in that, include: Mounting plate (1), on which a first housing (2) and a second housing (3) are hinged, and the first housing (2) and the second housing (3) are fixedly connected to each other on opposite sides; Two iron cores (12) are symmetrical to each other. Both iron cores (12) are located between the first housing (2) and the second housing (3). The outer side of each iron core (12) is provided with a winding (13) and a flame-retardant epoxy resin encapsulation layer (5). Two fixing frames (6) are respectively set outside the two flame-retardant epoxy resin encapsulation layers (5); The floating centering module (8) is located outside the two fixed frames (6). The floating centering module (8) includes multiple arc frames (801) and arc plates (803). Multiple springs (804) are provided between the arc frames (801) and the arc plates (803). The self-compensating locking module (9) is located outside the two fixed frames (6). The self-compensating locking module (9) includes a fixed boss (901) and a movable boss (902). The fixed boss (901) and the movable boss (902) are provided with the same hollow rod (903).

2. An open-type current transformer for a power distribution switchgear according to claim 1, characterized in that, Also includes: Heat insulation plate (4), the heat insulation plate (4) is disposed on the upper side of the mounting plate (1), and the heat insulation plate (4) is located between the first housing (2) and the second housing (3); Two support bases (7), each of the two support bases (7) is movably connected to two rotating frames (10), each rotating frame (10) has a round opening, and each of the two support bases (7) has two positioning pins (11) inserted into it, the outside of each positioning pin (11) being inserted into the inner wall of the round opening on the same side. Two mating plates (14) are respectively set on two fixed frames (6), and the opposite sides of the two mating plates (14) are attached together.

3. An open-type current transformer for a power distribution switchgear according to claim 2, characterized in that, The floating centering module (8) also includes: Multiple concave arc-shaped parts (802) are respectively disposed on the outside of multiple arc-shaped frames (801), and the outside of multiple rotating frames (10) is fixedly connected to the outside of multiple arc plates (803), and the outside of the arc-shaped frames (801) is fixedly connected to the outside of the fixed frame (6) on the same side. Two carbon fiber lines (812) are respectively disposed on the outside of two concave arc-shaped parts (802) on the same side; Multiple curved slide rails (805) are respectively set on the outside of multiple arc plates (803), and the same movable table (806) is slidably connected to two curved slide rails (805) on the same side. Multiple curved surface components (807) are respectively disposed on the outside of multiple arc plates (803), and multiple socket holes (808) are provided on each curved surface component (807).

4. An open-type current transformer for a power distribution switchgear according to claim 3, characterized in that, The floating centering module (8) also includes: Two limiting members (809) are respectively set on two movable platforms (806). One end of each limiting member (809) is inserted into the inner wall of the socket (808) on the same side, and a spring (810) is provided on the end of each limiting member (809) away from the socket (808). The bottom of the integrated plate (811) is fixedly connected to the upper side of the two movable platforms (806); Multiple extension frames (819) are provided on the upper side of the integrated plate (811). Each extension frame (819) is provided with a guide roller (820) on its exterior. The exterior of the guide roller (820) is in contact with the exterior of the carbon fiber line (812) on the same side. A bidirectional lead screw (814) is disposed above the integrated plate (811). The bidirectional lead screw (814) has two symmetrical protrusions on its exterior, and the bottom of each protrusion is fixedly connected to the upper side of the integrated plate (811). Two movable blocks (816) are provided outside the bidirectional lead screw (814). The two movable blocks (816) are slidably connected to the same slide rail (817). The bottom of the slide rail (817) is fixedly connected to the upper side of the integrated plate (811).

5. An open-type current transformer for a power distribution switchgear according to claim 4, characterized in that, The floating centering module (8) also includes: Multiple round rods (818) are fixedly connected to the outside of a movable block (816) on the same side, and annular grooves are provided on each round rod (818). Multiple fixing rings (813) are fixedly connected to the two ends of two carbon fiber wires (812) respectively. The fixing rings (813) are all located on the outside of the annular groove on the same side. A knob (815) is located on the outside of the bidirectional lead screw (814); Two limiting plates (821) are respectively set on two moving blocks (816). A rectangular groove is opened on the upper side of each of the two moving blocks (816). A thin rod is set in each rectangular groove. The outside of the thin rod is movably connected to the limiting plate (821) on the same side. An elastic spring (822) is fixedly connected to the inner wall of each rectangular groove. The other end of the elastic spring (822) is fixedly connected to the outside of the limiting plate (821) on the same side. Two stops (825) are fixedly connected to the bottom inner wall of the rectangular groove, and the outside of the stops (825) contacts the side of the limiting plate (821) away from the elastic spring (822).

6. An open-type current transformer for a power distribution switchgear according to claim 5, characterized in that, The floating centering module (8) also includes: An isolation frame (823) is fixedly connected at its bottom to the upper side of the integrated plate (811); Two racks (824) are respectively set on the inner wall of the isolation frame (823), and the exterior of the two limiting plates (821) are engaged with the racks (824) on the same side.

7. An open-type current transformer for a power distribution switchgear according to claim 2, characterized in that, The self-compensating locking module (9) also includes: The slide groove (904) is disposed on the docking plate (14) on the same side as the movable boss (902), and the inner wall of the slide groove (904) is slidably connected to the outer side of the movable boss (902). Airbag (906) is located outside the movable boss (902). A slot is provided on the docking plate (14) on the same side as the movable boss (902). The inner wall of the slot is in contact with the outside of the airbag (906). The bottom of the airbag (906) is in contact with the outside of the two flame-retardant epoxy resin encapsulation layers (5). Guide frame (905), the guide frame (905) is disposed outside the airbag (906), and the bottom of the guide frame (905) is fixedly connected to the upper side of the docking plate (14) on the same side. A limiting ring (908) is disposed outside the hollow rod (903), and the outside of the limiting ring (908) is engaged with the outside of the movable boss (902).

8. An open-type current transformer for a power distribution switchgear according to claim 7, characterized in that, The self-compensating locking module (9) also includes: A conical rod (907) is inserted into the inner wall of a hollow rod (903). An annular frame (909) is fixedly connected to the outside of the conical rod (907). Two L-shaped grooves (910) are circumferentially distributed on the annular frame (909). A short shaft (911) is snapped into each L-shaped groove (910). The short shafts (911) are fixedly connected to the opposite side of the outside of the conical rod (907). A short rod (912) is disposed outside the conical rod (907). A guide frame (913) is slidably connected to the outside of the short rod (912), and the guide frame (913) is fixedly connected to the opposite side of the outer side of the annular frame (909).

9. An open-type current transformer for a power distribution switchgear according to claim 8, characterized in that, The self-compensating locking module (9) also includes: Spring 3 (914) surrounds short rod (912), one end of spring 3 (914) is fixedly connected to the outside of conical rod (907), and the other end of spring 3 (914) is fixedly connected to the outside of guide frame (913).

10. An open-type current transformer for a power distribution switchgear according to claim 9, characterized in that, The self-compensating locking module (9) also includes: Two reserved slots (917) are opened on the inner wall of the hollow rod (903). Locking blocks (915) are slidably connected in the reserved slots (917). The outside of the locking blocks (915) is in contact with the outside of the cone rod (907). Two springs (916) are provided inside the hollow rod (903). One end of each spring (916) is fixedly connected to the outside of the locking block (915) on the same side, and the other end of each spring (916) is fixedly connected to the inner wall of the hollow rod (903).

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