A three-phase mutual inductor type electric energy metering box

Abstract

The present invention discloses a three-phase mutual inductor type electric energy meter box, which relates to the technical field of electric energy meter boxes, and includes a box body, an electrical beam, a circuit breaker, a mutual inductor, a fixed plate, a floating plate, and a buffer device. The buffer device is used to generate damping buffering for the movement of the floating plate when the floating plate is vibrated and moves; a live wire centering device is arranged on the floating plate, and the live wire centering device is used to make the part of the live wire located in the busbar hole of the mutual inductor coaxial with the busbar hole of the mutual inductor. In the present invention, when the circuit breaker in the box body is subjected to the vibration force and moves on the electrical beam, the circuit breaker will drive the live wire to move, and the part of the live wire that penetrates into the busbar hole of the mutual inductor is coaxial with the busbar hole through the live wire centering device, and when the circuit breaker drives the live wire to move, the buffer device synchronously drives the mutual inductor to perform corresponding movement, thereby avoiding the live wire from being pulled with a large amplitude, thereby causing the live wire centering device to damage the surface of the live wire.

Description

Technical Field

[0001] The invention relates to the technical field of electric energy metering boxes, in particular to a three-phase mutual inductor type electric energy metering box. Background Art

[0002] The electric energy meter box is a device used for electric energy metering. It includes electric energy meters, voltage and current transformers for metering and their secondary circuits, electric energy metering panels, cabinets, boxes and other components. This metering box can be installed in a suspended or floor-standing manner. In order to ensure the quality of installation, the hanging box must be fixed with built-in expansion bolts. The electric energy metering box is generally used for 3~35kv electric energy metering. Its components include a combined transformer (used to collect three-phase current and voltage signals), a box, an electric meter, a lightning arrester, a vacuum circuit breaker, etc. The current accuracy is generally 0.2S, and the voltage accuracy level is 0.2. According to different classifications, the electric energy metering box can be of the following types: According to the type of electric energy meter and the number of meter positions in the metering box, it can be divided into direct access type and access type via a transformer. The direct access type includes single-phase single meter position, single-phase multi-meter position, three-phase single meter position, three-phase multi-meter position metering box, etc. According to the different shell materials of the electric energy meter box, it can be divided into SMC non-metallic meter box, PCABS non-metallic meter box, stainless steel metal meter box, hot-dip galvanized metal meter box, etc. These electric energy meter boxes are widely used in various power systems to accurately measure the power consumption.

[0003] Three current transformers (or voltage transformers) are installed inside the three-phase inductive energy meter box. The current transformers (or voltage transformers) detect the current in the three live wires. When installing the wiring, the staff needs to pass the live wire through the busbar hole of the current transformer (or voltage transformer), and try to straighten the live wire and pass it through the busbar hole of the current transformer (or voltage transformer). When the current transformer (or voltage transformer) detects the current (or voltage) on the live wire, it is necessary to ensure that a section of the live wire passing through the busbar hole is basically coaxial with the busbar hole, otherwise the live wire deviates from the center of the busbar hole, which will cause uneven distribution of the magnetic field of the current transformer coil, thereby causing measurement errors. In addition, the output of the transformer and the measured current may no longer be in a linear relationship. As is known to all, the electric energy metering box currently used generally has circuit breakers and relays installed therein, and these circuit breakers and relays are stuck on the electrical beam. In addition, when the circuit breakers and relays are subjected to a certain thrust on the electrical beam, they can slide horizontally on the electrical beam. In addition, these devices will generate vibrations when working. When the vibration is too large, the circuit breaker connected to the live wire will slide on the electrical beam and cause position displacement, thereby causing the live wire to shift with the circuit breaker, thus causing the live wire and the busbar hole of the current transformer (or voltage transformer) to shift, thereby causing the detection error of the current transformer (or voltage transformer). In addition, when the outside world generates a large vibration or the electric energy metering box is hit, it may also cause the circuit breaker to slide on the electrical beam, thereby causing the live wire and the busbar hole of the current transformer (or voltage transformer) to shift. Summary of the invention

[0004] The purpose of the present invention is to provide a three-phase mutual inductor electric energy metering box to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A three-phase mutual inductor type electric energy meter box, comprising a box body of the electric energy meter box and an electrical beam connected to the box body, a circuit breaker is mounted on the electrical beam, a live wire and a neutral wire are connected to the connection terminals of the circuit breaker, a mutual inductor is installed in the box body, the live wire passes through the busbar hole of the mutual inductor correspondingly, and further comprising: A fixing plate connected to the inner wall of the box; A floating plate movably connected to the outer wall of the fixed plate on one side facing the box body opening, the mutual inductor is installed on the floating plate, the floating plate and the fixed plate are connected by a buffer device, and the buffer device is used to generate damping buffer for the movement of the floating plate when the floating plate is vibrated and moves; A live wire centering device is arranged on the floating plate, and is used to make the part of the live wire located in the busbar hole of the transformer coaxial with the busbar hole of the transformer.

[0006] Furthermore, both sides of the box body opening are rotatably connected with box doors.

[0007] Furthermore, a connection terminal is connected to the inner wall of the box, and one end of the live wire and the neutral wire away from the circuit breaker is electrically connected to the connection terminal.

[0008] Furthermore, the buffer device includes a connecting portion fixedly connected to the outer wall of the floating plate on the side facing away from the transformer, a gap is formed on the surface of the fixed plate for the connecting portion to pass freely, the aperture of the gap is larger than the outer diameter of the connecting portion, a stop portion is fixedly connected to one end of the connecting portion passing through the gap, the outer diameter of the stop portion is larger than the aperture of the gap, a retaining ring is fixedly connected to the outer wall of the fixed plate on the side facing away from the floating plate, the stop portion is located inside the retaining ring, a plurality of elastic members are provided between the periphery of the stop portion and the inner ring wall of the retaining ring, the elastic members have a pre-pressure on the stop portion toward the radial inner side of the stop portion.

[0009] Furthermore, the elastic member is a spring, and two ends of the spring in the direction of elastic force are respectively fixed to the periphery of the stop portion and the inner ring wall of the retaining ring.

[0010] Furthermore, the live wire centering device includes bent portions fixed to the edges of the floating plate in groups of two, the two bent portions in the same group respectively corresponding to the two ends of the same mutual inductor, a fixing sleeve is vertically penetrated through the surface of the bent portion, the fixing sleeve is coaxial with the busbar hole of the mutual inductor, and a live wire through-hole in the form of a through-hole is coaxially opened on the end face of the fixing sleeve, a deformation portion is coaxially fixed to the end of the fixing sleeve away from the mutual inductor, the outer diameter of the deformation portion increases successively in the direction away from the mutual inductor, and a plurality of deformation seams penetrating to the live wire through-hole are opened on the periphery of the deformation portion, and a self-clamping unit is provided on the outer wall of the fixed plate, and the self-clamping unit is used to subject the periphery of the deformation portion to an extrusion force when the floating plate is vibrated and moved, so that the hole wall of the live wire through-hole clamps the live wire.

[0011] The cam is provided with a plurality of grooves, and the grooves are provided with a plurality of grooves, and the grooves are connected with the grooves to form a plurality of grooves.

[0012] Furthermore, a ball is rotatably embedded at the end of the sliding rod, and the ball rolls in contact with the inner wall of the groove.

[0013] Furthermore, a rubber sleeve is inserted and installed in the firing line through hole, and the firing line freely passes through the middle hole of the rubber sleeve.

[0014] Furthermore, a notch penetrating the hole in the rubber sleeve is provided on the periphery of the rubber sleeve.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, when the circuit breaker in the box is subjected to the vibration force and moves on the electrical beam, the circuit breaker will drive the live wire to move, and the live wire centering device makes the part where the live wire penetrates into the busbar hole of the transformer coaxial with the busbar hole, and the buffer device drives the transformer to move accordingly when the circuit breaker drives the live wire to move, thereby preventing the live wire from being pulled to a large extent, thereby causing the live wire centering device to damage the live wire surface; 2. In the present invention, when the box is in normal use, the end of the sliding rod will abut against the inner wall of the groove, so that the conical groove of the sliding sleeve will not generate an extrusion force on the periphery of the deformed portion. When the floating plate is vibrated and moves, the end of the sliding rod will slide on the inner wall of the groove, and the end of the sliding rod will slide from the side with a smaller inner diameter of the groove to the side with a larger inner diameter, so that the sliding rod is squeezed by the inner wall of the groove and moves toward the direction of the sliding sleeve, so that the short pin slides in the waist-shaped hole, and the sliding sleeve moves toward the direction of the deformed portion, and the sliding sleeve is The inner wall of the conical groove of the sliding sleeve squeezes the periphery of the deformation part, so that the deformation part generates an extrusion force along the radial inner side thereof, and then the deformation part generates elastic contraction deformation, so that the hole wall of the live wire perforation clamps the live wire, so that when the floating plate is vibrated and moves, the hole wall of the live wire perforation can tighten the two sides of the live wire passing through the transformer busbar hole, so as to avoid that when the floating plate moves, the live wire corresponding to the two sides of the transformer busbar hole generates a large bending deformation, resulting in a misalignment with the transformer busbar hole, thereby affecting the detection accuracy of the transformer; 3. In the present invention, a rubber sleeve is provided, and the fire wire passes through the rubber sleeve, so that when the floating plate moves, the edge of the hole through which the fire wire passes will not cut or rub the outer surface of the fire wire. In addition, a notch is provided at the periphery of the rubber sleeve, so that the rubber sleeve can have a certain shrinkage deformation. Since the shrinkage amplitude of the deformation part is proportional to the stroke of the sliding rod moving toward the sliding sleeve, the rubber sleeve can shrink, and then the deformation part can have a larger elastic shrinkage amplitude, so that the sliding stroke of the end of the sliding rod on the inner wall of the groove is larger. Therefore, the floating plate can have a larger movement amplitude when vibrating, avoiding interference with the movement of the floating plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a three-phase mutual inductor electric energy metering box in the present invention; Figure 2 for Figure 1 A schematic diagram of the structure from another perspective; Figure 3 for Figure 1 The schematic diagram of the position relationship after the box body, box door and circuit breaker are omitted; Figure 4 for Figure 3 A schematic diagram of the structure from the first perspective; Figure 5 for Figure 3 A schematic diagram of the structure of the second perspective; Figure 6 It is a schematic diagram of the positional relationship of the cross-section of the partial structure after the mutual inductor and the fixing plate are assembled in the present invention; Figure 7 It is a schematic diagram of the positional relationship of the mutual inductor, the floating plate and the fixed plate after being assembled in the present invention; Figure 8 for Figure 7 A magnified schematic diagram of the local structure at point A; Fig. 9 for Figure 7 Schematic diagram of the explosion decomposition of the structure; Fig.10 It is a schematic diagram of the positional relationship of the sliding sleeve, the fixed sleeve and the flange part after assembly in the present invention; Fig.11 for Fig.10 Schematic diagram of the explosion decomposition of the structure; Fig.12 for Fig.10 Schematic diagram of the positional relationship of the structure after it is cut open.

[0017] In the figure, the description of each figure mark is as follows: 1, box door; 2, circuit breaker; 3, box body; 4, electrical beam; 5, fixed plate; 6, live wire; 7, connecting terminal; 8, mutual inductor; 9, floating plate; 10, flange; 11, ear block; 12, sliding sleeve; 13, bending part; 14, stopper; 15, spring; 16, retaining ring; 17, air avoidance groove; 18, fixing sleeve; 19, sliding rod; 20, connecting part; 21, rubber sleeve; 22, groove; 23, short pin; 24, waist-shaped hole; 25, U-shaped frame; 26, notch; 27, deformation part; 28, ball; 29, deformation seam; 30, cone groove. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1 - Fig.12 The present invention provides a technical solution: a three-phase mutual inductor electric energy meter box, comprising a box body 3 of the electric energy meter box and an electric appliance beam 4 connected to the box body 3, a box door 1 is installed at the mouth of the box body 3, a circuit breaker 2 is clamped and installed on the electric appliance beam 4, and because the circuit breaker 2 is clamped on the electric appliance beam 4, the circuit breaker 2 can slide on the electric appliance beam 4 when subjected to a certain amount of force, a threading hole is opened at the bottom of the box body 3, and the cable in the external circuit is inserted into the box body 3 through the threading hole, a connecting terminal 7 is installed on the inner wall of the box body 3, and the cable is connected to the connecting terminal 7, and three live wires 6 and a neutral wire are connected to the connecting terminal 7, and the three live wires 6 and the neutral wire are electrically connected to the external cable respectively, and the ends of the three live wires 6 and the neutral wire away from the connecting terminal 7 are correspondingly connected to the wiring terminals of the circuit breaker 2, and three mutual inductors 8 are also installed in the box body 3, and the three live wires 6 are respectively passed through the busbar holes of the three mutual inductors 8; A fixing plate 5 is installed on the inner wall of the box body 3, and there is a gap between the side of the fixing plate 5 facing away from the box door 1 and the inner wall of the box body 3. A floating plate 9 is contacted and connected to the outer wall of the fixing plate 5 facing the opening of the box body 3. The surface of the floating plate 9 is in contact with the surface of the fixing plate 5 and slides on the surface of the fixing plate 5. Three mutual inductors 8 are installed in a row on the outer wall of the floating plate 9. The outer wall of the floating plate 9 facing away from the mutual inductor 8 is fixedly connected with a connecting portion 20 (such as Figure 6 As shown, the connecting portion 20 passes through the fixing plate 5, and a clearance groove 17 is provided on the surface of the fixing plate 5 for the connecting portion 20 to pass freely. The clearance groove 17 (as shown Fig. 9 The hole diameter of the connecting portion 20 is much larger than the outer diameter of the connecting portion 20, so that the connecting portion 20 can move freely in the air-avoiding groove 17. In addition, the end surface of one side of the connecting portion 20 passing through the air-avoiding groove 17 is coaxially fixed with a stopper 14. The outer diameter of the stopper 14 is larger than the hole diameter of the air-avoiding groove 17, so that the stopper 14 will not be separated from the air-avoiding groove 17. The distance between the stopper 14 and the opposite surface of the floating plate 9 is consistent with the thickness of the fixed plate 5, so that the floating plate 9 can maintain a close contact with the surface of the fixed plate 5. An annular retaining ring 16 is fixedly connected to the outer wall of the fixed plate 5 on one side facing the inner wall of the box body 3, the stopper 14 is located in the retaining ring 16, and the periphery of the stopper 14 is fixedly connected to four springs 15 in an array along its axial direction, and the two ends of the spring 15 in the elastic direction are respectively fixedly connected to the periphery of the stopper 14 and the inner wall of the retaining ring 16, so that when the floating plate 9 is vibrated and moves, the four springs 15 will be compressed and elongated accordingly, thereby generating damping buffering for the movement of the floating plate 9; The edges of both sides of the floating plate 9 in the width direction are fixedly connected with bent portions 13 that are vertically bent toward the mutual inductor 8. The bent portions 13 are arranged in groups of two, and three groups. The two bent portions 13 in the same group correspond to the two ends of the same mutual inductor 8, and a fixing sleeve 18 (such as Figure 5 As shown in FIG. 1 ), the fixing sleeve 18 is coaxial with the busbar hole of the transformer 8, and the end surface of the fixing sleeve 18 is coaxially provided with a live wire through hole in the form of a through hole, and the end of the fixing sleeve 18 away from the transformer 8 is coaxially fixed with a deformation portion 27 (as shown in FIG. Figure 8 As shown in FIG. 1 ), the outer diameter of the deformation portion 27 increases gradually in the direction away from the transformer 8 (as shown in FIG. 1 ). Fig.11 As shown), a plurality of deformation slits 29 penetrating to the firing line through-hole are provided at the periphery of the deformation portion 27. Due to the provision of the deformation slits 29, the periphery of the deformation portion 27 can produce elastic contraction deformation when subjected to the extrusion force along the radial inner side thereof. In addition, a rubber sleeve 21 is inserted and installed in the firing line through-hole. The middle hole on the rubber sleeve 21 can allow the firing line 6 to pass freely. In addition, a notch 26 penetrating the middle hole of the rubber sleeve 21 is provided at the periphery of the rubber sleeve 21; The fixed sleeve 18 is slidably mounted with the sliding sleeve 12 at its periphery. The sliding sleeve 12 has a conical groove 30 formed on its end surface to form a taper with the deformed portion 27. The surface of the bent portion 13 is fixedly connected with an ear block 11 (such as Figure 8 As shown in the figure, a sliding rod 19 is slidably penetrated on the surface of the ear block 11, and a U-shaped frame 25 is fixedly connected to the end of the sliding rod 19 facing away from the fixed plate 5. The sliding sleeve 12 is correspondingly engaged in the middle hollow part of the U-shaped frame 25. Short pins 23 are fixedly connected to both sides of the periphery of the sliding sleeve 12. Waist-shaped holes 24 for corresponding insertion of the short pins 23 are opened on the outer walls of both sides of the U-shaped frame 25. The short pins 23 slide freely in the waist-shaped holes 24. The length direction of the waist-shaped hole 24 forms an angle with the axial direction of the sliding rod 19. The outer wall of the fixed plate 5 is connected to the flange part 10, and a groove 22 is opened on one end surface of the flange part 10 (as shown in the figure). Fig.12 As shown in FIG. 1 , the inner diameter of the groove 22 decreases gradually toward the direction close to the fixed plate 5 , and a ball 28 is rotatably embedded at the end of the sliding rod 19 , and the ball 28 rolls and contacts the inner wall of the groove 22 .

[0020] Working principle of the present invention: Under normal working conditions, since the deformation portion 27 itself has elastic deformation ability, the periphery of the deformation portion 27 generates a force on the inner wall of the tapered groove 30 of the sliding sleeve 12, so that the sliding sleeve 12 moves in the direction away from the deformation portion 27, and the ball 28 at the end of the sliding rod 19 is engaged with the inner wall of the groove 22 with the smallest inner diameter. At this time, the elastic expansion amplitude of the firing line through hole is the largest, and the clamping force of the hole wall of the rubber sleeve 21 installed on the firing line through hole on the firing line 6 is relatively small at this time, so it can be avoided that the rubber sleeve 21 clamps the firing line 6 for a long time, causing the outer surface of the firing line 6 to be dented or damaged. When the box body 3 is subjected to external vibration force or the vibration of the circuit breaker 2 during the opening and closing action is large, the circuit breaker 2 may move on the electrical beam 4. At this time, the circuit breaker 2 will pull the live wire 6 and the neutral wire to move. When the live wire 6 moves, it will generate a pulling force on the fixed sleeve 18, so that the fixed sleeve 18 drives the floating plate 9 to move. When the floating plate 9 moves, it will drive the ball 28 at the end of the sliding rod 19 to roll on the inner wall of the groove 22, and then roll from the inner diameter side of the inner wall of the groove 22 with the smallest inner diameter toward the inner diameter side with the larger inner diameter, so that the sliding rod 19 will move toward the direction of the mutual inductor 8. When moving, the sliding rod 19 drives the U-shaped frame 25 to move in the direction away from the fixed plate 5, so that the short pin 23 slides in the waist-shaped hole 24. Fig.10As shown, the short pin 23 will slide in the waist-shaped hole 24 from the lower side of the waist-shaped hole 24 to the upper side of the waist-shaped hole 24, so that the sliding sleeve 12 can slide on the fixed sleeve 18, and the inner wall of the conical groove 30 generates a squeezing force on the periphery of the deformation part 27, thereby causing the deformation part 27 to produce elastic contraction deformation, so that the rubber sleeve 21 can be squeezed by the hole wall of the live wire penetration and be in a contracted state, thereby increasing the clamping force of the rubber sleeve 21 on the live wire 6, so that when the live wire 6 is pulled and moved by the circuit breaker 2, the clamping force of the rubber sleeve 21 on the live wire 6 is increased, thereby preventing the live wire 6 from being deformed when being pulled, thereby causing the position of the live wire 6 penetrating into the busbar hole of the transformer 8 to be offset or bent, thereby affecting the detection accuracy of the transformer 8; In addition, when the live wire 6 is pulled by the circuit breaker 2, the floating plate 9 moves, which causes the four springs 15 to produce corresponding compression and elongation deformations, thereby producing damping buffering for the movement of the floating plate 9. Therefore, the process of the circuit breaker 2 being moved by the vibration force can be buffered to a certain extent, and the circuit breaker 2 can be prevented from moving to a large position, causing the live wire 6 to be pulled by the circuit breaker 2 and deformed. At the same time, due to the movement of the floating plate 9, the end of the live wire 6 passing through the rubber sleeve 21 will not be bent and deformed due to being pulled by the circuit breaker 2. In addition, when subjected to vibration force, the floating plate 9 can move to buffer the vibration, which can reduce the influence of the vibration on the detection accuracy of the mutual inductor 8 to a certain extent.

[0021] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may 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 three-phase mutual inductor type electric energy meter box, comprising a box body (3) of the electric energy meter box and an electrical beam (4) connected to the box body (3), a circuit breaker (2) being mounted on the electrical beam (4), a live wire (6) and a neutral wire being correspondingly connected to the connection terminals of the circuit breaker (2), a mutual inductor (8) being further mounted in the box body (3), the live wire (6) correspondingly passing through the busbar hole of the mutual inductor (8), characterized in that: Also includes: A fixing plate (5) connected to the inner wall of the box body (3); a floating plate (9) movably connected to an outer wall of the fixed plate (5) on a side facing the opening of the box body (3), the mutual inductor (8) being mounted on the floating plate (9), the floating plate (9) and the fixed plate (5) being connected via a buffer device, the buffer device being used to generate a damping buffer for the movement of the floating plate (9) when the floating plate (9) is vibrated and moves; A live wire centering device is provided on the floating plate (9), the live wire centering device being used to make the portion of the live wire (6) located in the busbar hole of the mutual inductor (8) coaxial with the busbar hole of the mutual inductor (8).

2. The three-phase mutual inductor electric energy meter box according to claim 1, characterized in that: Box doors (1) are rotatably connected to both sides of the opening of the box body (3).

3. The three-phase mutual inductor electric energy meter box according to claim 1 is characterized in that: The inner wall of the box body (3) is connected to a connection terminal (7), and the ends of the live wire (6) and the neutral wire away from the circuit breaker (2) are electrically connected to the connection terminal (7).

4. The three-phase mutual inductor electric energy meter box according to claim 1, characterized in that: The buffer device comprises a connecting portion (20) fixedly connected to the outer wall of the floating plate (9) on the side facing away from the mutual inductor (8); a clearance groove (17) is provided on the surface of the fixed plate (5) for the connecting portion (20) to freely pass through; the aperture of the clearance groove (17) is larger than the outer diameter of the connecting portion (20); a stopper (14) is fixedly connected to one end of the connecting portion (20) passing through the clearance groove (17); the outer diameter of the stopper (14) is larger than the aperture of the clearance groove (17); a retaining ring (16) is fixedly connected to the outer wall of the fixed plate (5) on the side facing away from the floating plate (9); the stopper (14) is located inside the retaining ring (16); a plurality of elastic members are provided between the periphery of the stopper (14) and the inner ring wall of the retaining ring (16); the elastic members exert a pre-pressure on the stopper (14) in the radial direction inward of the stopper (14).

5. The three-phase mutual inductor electric energy meter box according to claim 4 is characterized in that: The elastic member is a spring (15), and two ends of the spring (15) in the elastic force direction are respectively fixed to the periphery of the stop portion (14) and the inner ring wall of the retaining ring (16).

6. The three-phase mutual inductor electric energy meter box according to claim 1, characterized in that: The live wire centering device comprises bent portions (13) fixedly connected to the edge of the floating plate (9) in groups of two, the two bent portions (13) in the same group respectively corresponding to the two ends of the same mutual inductor (8), a fixing sleeve (18) is vertically penetrated on the surface of the bent portion (13), the fixing sleeve (18) is coaxial with the busbar hole of the mutual inductor (8), and the end surface of the fixing sleeve (18) is coaxially provided with a live wire through hole in the form of a through hole, the fixing sleeve (18) is away from the mutual inductor (8) ) is coaxially fixedly connected to one end of the deformation portion (27), the outer diameter of the deformation portion (27) gradually increases in a direction away from the mutual inductor (8), and a plurality of deformation seams (29) are provided on the periphery of the deformation portion (27) and penetrate to the live wire through hole, and a self-clamping unit is provided on the outer wall of the fixed plate (5), and the self-clamping unit is used to apply a squeezing force to the periphery of the deformation portion (27) when the floating plate (9) is vibrated and moves, so that the hole wall of the live wire through hole clamps the live wire (6).

7. The three-phase mutual inductor electric energy meter box according to claim 6, characterized in that: The self-clamping unit comprises a sliding sleeve (12) slidably mounted on the periphery of the fixed sleeve (18); a conical groove (30) is formed on the end surface of the sliding sleeve (12) and forms a taper with the deformed portion (27); an ear block (11) is fixedly connected to the surface of the bent portion (13); a sliding rod (19) is slidably penetrated through the surface of the ear block (11); a U-shaped frame (25) is fixedly connected to one end of the sliding rod (19) facing away from the fixed plate (5); the sliding sleeve (12) is correspondingly engaged in the middle hollow portion of the U-shaped frame (25); short pins (25) are fixedly connected to both sides of the periphery of the sliding sleeve (12) 3), waist-shaped holes (24) for corresponding insertion of the short pins (23) are provided on the outer walls of both sides of the U-shaped frame (25), and the short pins (23) slide freely in the waist-shaped holes (24), and the length direction of the waist-shaped holes (24) forms an angle with the axial direction of the sliding rod (19), and the outer wall of the fixed plate (5) is connected to a flange portion (10), and a groove (22) is provided on one end surface of the flange portion (10), and the inner diameter of the groove (22) decreases gradually in the direction approaching the fixed plate (5), and one end of the sliding rod (19) facing the fixed plate (5) abuts against the inner wall of the groove (22).

8. The three-phase mutual inductor electric energy meter box according to claim 7, characterized in that: A ball (28) is rotatably embedded at the end of the sliding rod (19), and the ball (28) rolls in contact with the inner wall of the groove (22).

9. The three-phase mutual inductor electric energy meter box according to claim 7, characterized in that: A rubber sleeve (21) is inserted and installed in the firing line through hole, and the firing line (6) freely passes through the middle hole of the rubber sleeve (21).

10. The three-phase mutual inductor electric energy meter box according to claim 9, characterized in that: A notch (26) penetrating the hole in the rubber sleeve (21) is provided on the periphery of the rubber sleeve (21).

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