Flexible digital current transformer

Abstract

According to the technical scheme, the flexible digital current transformer is characterized in that the flexible digital current transformer comprises a Rogowski coil and a transformer body, the transformer body comprises a box body composed of an upper shell and a lower shell, the two ends of the box body are correspondingly provided with communicated hole grooves, and the two ends of the Rogowski coil stretch into the hole grooves to be connected with a circuit board; one end of the Rogowski coil is provided with a connecting plug matched with the hole groove in an inserted mode, a mounting groove is formed in the position, corresponding to the hole groove, of the connecting plug, a limiting plate matched with the connecting plug in a clamped mode and a reset spring driving the limiting plate to move towards the connecting plug are slidably arranged in the mounting groove, and the limiting plate is connected with a button with one end penetrating through the box body and exposed to the outside; an abutting ring is further arranged on the outer side of the circumference of the connecting plug, and an elastic piece driving the connecting plug to be away from the hole groove is arranged between the hole groove and the abutting ring. The limiting plate arranged in a sliding mode and the button are matched with the connecting plug, one end of the Rogowski coil can be rapidly disassembled and assembled, meanwhile, the button does not need too large operation space, and disassembling and assembling are more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of mutual inductors, in particular to a flexible digital current mutual inductor. Background Art

[0002] Flexible digital current transformer is also called Rogowski coil transformer. The main body includes Rogowski coil, circuit board of transformer and shell that wraps the circuit board. In today's power grid power system, high current monitoring and measurement are mainly completed by Rogowski flexible coil transformer. Because it has no saturation limit due to large current passing through and has high measurement accuracy, it is widely used. The theoretical basis of Rogowski coil current measurement is Faraday's law of electromagnetic induction and Ampere's loop law. When the measured current passes through the center of Rogowski coil along the axis, a corresponding magnetic field is generated in the volume surrounded by the annular winding. The existing Rogowski coil generally uses a spiral at the opening. Bolt fixing or snap fixing, although bolt fixing is firm, the operation steps are very cumbersome and take a lot of time; the snap structure is similar to the patent No. (CN202222863434.7) which discloses a transformer structure with electromagnetic shielding. One end of the Rogowski coil is fixed based on the circumferential rotation between the block of the plug connector and the track groove of the connector. However, during the fixing and disassembly process, one end of the Rogowski coil needs to be rotated while keeping the main body stationary, which requires both hands to operate. If the operating space is small or the Rogowski coil is against the object to be measured, it will be difficult for the staff to rotate the plug connector, and the operation will be troublesome. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a flexible digital current transformer, which can realize the rapid disassembly and assembly of one end of the Rogowski coil through a sliding limit plate and a button in combination with a plug connector. At the same time, the setting of the button does not require too large an operating space, making disassembly and assembly more convenient.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical solution: a flexible digital current transformer, comprising a Rogowski coil and a transformer body, the transformer body comprising a box body composed of an upper shell and a lower shell, a circuit board is arranged in the box body, a wiring terminal connected to the circuit board is arranged on the box body, and interconnected holes and grooves are correspondingly arranged at both ends of the box body, and both ends of the Rogowski coil extend into the holes and grooves to be connected to the circuit board; a plug connector that is plugged into the hole and groove is arranged at one end of the Rogowski coil, and an installation groove is arranged at the hole and groove corresponding to the plug connector, a limit plate that is snap-fitted with the plug connector and a reset spring that drives the limit plate to move toward the plug connector are slidably arranged in the installation groove, and the limit plate is connected to a button with one end passing through the box body and exposed to the outside; an abutment ring is also arranged on the outer side of the circumference of the plug connector, and an elastic member that drives the plug connector away from the hole and groove is arranged between the hole and the abutment ring.

[0005] The utility model is further configured such that the installation groove is arranged on the lower shell, and the button passes through the upper shell and is exposed to the outside; a locking mechanism is arranged between the outer surface of the upper shell and the button to limit the button from sliding into the box body.

[0006] The utility model is further configured such that the locking mechanism includes an annular groove arranged on the circumferential side of the end of the button exposed to the outside, and a locking plate is slidably arranged on the outer surface of the upper shell body and slides horizontally relative to the button, and a locking groove is arranged at one end of the locking plate opposite to the button and is engaged with the annular groove.

[0007] The utility model is further configured such that an abutment surface is formed in a stepped manner between the end of the plug connector away from the hole slot and the Rogowski coil, and a limiting groove is provided at one end of the limiting plate opposite to the Rogowski coil, the limiting groove is clamped on the Rogowski coil and one side abuts against the abutment surface.

[0008] The utility model is further configured that a guide surface is arranged obliquely upward from the outside to the inside of the hole groove on one side of the limiting groove away from the abutting surface.

[0009] The utility model is further configured that the locking groove is in an arc shape and its opening can be elastically deformed, and the opening is configured in an eight-shaped shape.

[0010] The utility model is further configured that an electromagnetic shielding device is arranged in the hole groove.

[0011] The utility model is further configured that the electromagnetic shielding device is an alloy cylinder made of nickel-chromium alloy, and both ends of the Rogowski coil are inserted into the alloy cylinder.

[0012] The utility model is further configured that the elastic member abuts between the alloy tube and the abutting ring, and the elastic member is a rubber ring.

[0013] In summary, the beneficial effects of the utility model are:

[0014] Compared with the prior art, the present application can achieve fixed limiting of the plug connector by providing a plug connector at one end of the Rogowski coil and a limit plate provided at the hole slot position to engage with the plug connector, thereby completing the fixation of the end of the Rogowski coil. At the same time, the limit plate can move toward the plug connector under the action of a reset spring, thereby actively achieving fixed limiting of the plug connector during insertion; and a button with one end passing through the upper shell and exposed to the outside world allows the staff to unlock the plug connector by simply pressing the button when disassembling the coil. The unlocking is more convenient and quick, and does not require a large operating space. The elastic member can drive the plug connector out of the hole slot while completing the unlocking of the plug connector, so that the staff can complete the operation of disassembling the Rogowski coil with one hand.

[0015] The alloy cylinder can effectively shield electromagnetic waves, improve the stability and reliability of the product, and the elastic part and the limit plate can squeeze the plug connector to improve the stability of the plug connector after connection and avoid shaking. At the same time, the design of the button and locking mechanism can effectively prevent misoperation and external interference, and improve the safety and stability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural diagram of this embodiment.

[0017] Figure 2 It is a structural explosion diagram of this embodiment.

[0018] Figure 3 It is a diagram of the internal structure of this embodiment.

[0019] Figure 4 yes Figure 1 Enlarged view of the locking mechanism.

[0020] Figure 5 yes Figure 3 Magnified view of the hole slot.

[0021] Figure numerals: 1. Rogowski coil; 2. Transformer body; 31. Upper shell; 32. Lower shell; 33. Terminal block; 34. Hole slot; 5. Plug connector; 51. Abutment surface; 6. Mounting slot; 7. Limiting plate; 71. Guide surface; 8. Reset spring; 9. Button; 10. Locking mechanism; 101. Ring groove; 102. Locking plate; 103. Locking groove; 11. Alloy cylinder; 12. Elastic member; 13. Abutment ring. DETAILED DESCRIPTION

[0022] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0023] like Figure 1-5 As shown, this embodiment discloses a flexible digital current transformer, including a Rogowski coil 1 and a transformer body 2, wherein the transformer body 2 includes a box body composed of an upper shell 31 and a lower shell 32, wherein a circuit board is arranged in the box body, and a wiring terminal 33 connected to the circuit board is arranged on the box body, and holes 34 connected to each other are correspondingly arranged at both ends of the box body, and both ends of the Rogowski coil 1 extend into the holes 34 and are connected to the circuit board;

[0024] One end of the Rogowski coil 1 is provided with a plug connector 5 plugged into the hole slot 34, and a mounting groove 6 is provided at the hole slot 34 corresponding to the plug connector 5. The mounting groove 6 is provided on the lower shell 32, and a limit plate 7 plugged into the plug connector 5 and a return spring 8 driving the limit plate 7 to move toward the plug connector 5 are slidably provided in the mounting groove 6. The limit plate 7 is connected to a button 9 with one end penetrating the upper shell 31 and exposed to the outside.

[0025] An abutting surface 51 is formed in a stepped manner between the end of the plug connector 5 away from the hole slot 34 and the Rogowski coil 1. A limiting groove is provided at one end of the limiting plate 7 relative to the Rogowski coil 1. The limiting groove is clamped on the Rogowski coil 1 and one side is in abutment with the abutting surface 51. A guide surface 71 is provided obliquely upward from the outside to the inside of the hole slot 34 on the side of the limiting groove away from the abutting surface 51.

[0026] like Figure 2-3 As shown in Figure 5, when the staff needs to use the product, they hold the Rogowski coil 1, match the plug connector 5 with the hole groove 34 at one end of the box body, and then directly insert it. During the insertion process, since one side of the limiting plate 7 is an obliquely arranged guide surface 71, the end of the plug connector 5 will abut against the guide surface 71, so that the limiting plate 7 is squeezed downward and drops, so that the plug connector 5 can be smoothly inserted into the hole groove 34; when the end of the plug connector 5 passes through the limiting plate 7, the limiting plate 7 will be reset under the action of the reset spring 8, so that the limiting plate 7 abuts against the abutting surface 51 of the plug connector 5, thereby realizing the limiting fixation of the plug connector 5 and ensuring that the plug connector 5 cannot be separated from the hole groove 34.

[0027] At this time, when the staff needs to disassemble the Rogowski coil 1 , by pressing the button 9 , the button 9 will drive the limit plate 7 to descend, thereby releasing the lock on the plug connector 5 .

[0028] And as Figure 2 , 5 As shown, an abutment ring 13 is further provided at the end of the plug connector 5 away from the hole groove 34, and a rubber ring located between the abutment ring 13 and the alloy tube 11 is provided in the hole groove 34. When the user inserts the Rogowski coil 1, the staff needs to squeeze the elastic member 12 through the plug connector 5 to deform it until the limit plate 7 is reset; and when the staff presses the button 9, the elastic member 12 will return to its original state because the plug connector 5 loses its lock, so that the plug connector 5 will move out of the hole groove 34 under the action of the elastic force. At this time, the limit plate 7 cannot be reset, and the staff can easily pull out the plug connector 5, and the entire installation and disassembly process is more convenient and quick.

[0029] like Figure 1 , 4As shown, a locking mechanism 10 for limiting the button 9 from sliding into the box body is provided between the outer surface of the upper shell 31 and the button 9, and the locking mechanism 10 includes an annular groove 101 provided on the circumferential side of the end of the button 9 exposed to the outside, and a locking plate 102 for horizontal sliding relative to the button 9 is provided on the outer surface of the upper shell 31, and a locking groove 103 for engaging with the annular groove 101 is provided at one end of the locking plate 102 relative to the button 9, and the locking groove 103 is in an arc shape and its opening can be elastically deformed, and the opening is in an eight-shaped shape; when the staff completes the locking of the Rogowski coil 1, in order to prevent the staff from accidentally touching the button 9, the staff can slide the locking plate 102 toward the direction of the button 9, so that the locking groove 103 is stuck in the annular groove 101 of the button 9, thereby completing the locking of the position of the button 9 and effectively preventing misoperation.

[0030] like Figure 3 As shown, an electromagnetic shielding device is provided in the hole groove 34. The electromagnetic shielding device is an alloy cylinder 11 made of nickel-chromium alloy, and both ends of the Rogowski coil 1 are inserted into the alloy cylinder 11; through the application of the alloy cylinder 11, electromagnetic shielding can be effectively performed, and the stability and reliability of the product are improved. In addition, the elastic member 12 and the limiting plate 7 can limit and squeeze the plug connector 5, so that the stability of the plug connector 5 after connection can be improved to avoid shaking.

[0031] In this embodiment, the elastic member 12 abuts between the alloy tube 11 and the abutting ring 13 , and the elastic member 12 is a rubber ring.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible digital current transformer, comprising a Rogowski coil (1) and a transformer body (2), wherein the transformer body (2) comprises a box body consisting of an upper shell (31) and a lower shell (32), wherein a circuit board is arranged in the box body, and a wiring terminal (33) connected to the circuit board is arranged on the box body, and two ends of the box body are also correspondingly provided with interconnecting holes (34), and the two ends of the Rogowski coil (1) extend into the holes (34) to be connected to the circuit board; characterized in that: One end of the Rogowski coil (1) is provided with a plug connector (5) plugged into the hole groove (34); a mounting groove (6) is provided at the hole groove (34) corresponding to the plug connector (5); a limit plate (7) plugged into the plug connector (5) and a return spring (8) driving the limit plate (7) to move in the direction of the plug connector (5) are slidably provided in the mounting groove (6); the limit plate (7) is connected to a button (9) with one end penetrating through the box body and exposed to the outside; an abutment ring (13) is also provided on the outer side of the circumference of the plug connector (5); an elastic member (12) driving the plug connector (5) away from the hole groove (34) is provided between the hole groove (34) and the abutment ring (13).

2. A flexible digital current transformer according to claim 1, characterized in that: The mounting groove (6) is arranged on the lower shell (32), and the button (9) passes through the upper shell (31) and is exposed to the outside; a locking mechanism (10) is arranged between the outer surface of the upper shell (31) and the button (9) to limit the button (9) from sliding into the box body.

3. A flexible digital current transformer according to claim 2, characterized in that: The locking mechanism (10) comprises an annular groove (101) arranged on the peripheral side of the end of the button (9) exposed to the outside, and a locking plate (102) is slidably arranged on the outer surface of the upper shell (31) and slides horizontally relative to the button (9), and a locking groove (103) is arranged at one end of the locking plate (102) relative to the button (9) and is engaged with the annular groove (101).

4. A flexible digital current transformer according to claim 1 or 2, characterized in that: An abutment surface (51) is formed in a stepped manner between the end of the plug connector (5) away from the hole groove (34) and the Rogowski coil (1), and a limiting groove is provided at one end of the limiting plate (7) opposite to the Rogowski coil (1), the limiting groove is clamped on the Rogowski coil (1) and one side thereof is in abutment with the abutment surface (51).

5. A flexible digital current transformer according to claim 4, characterized in that: A guide surface (71) is provided on one side of the limiting groove away from the abutting surface (51) and is arranged obliquely upward from the outside to the inside of the hole groove (34).

6. A flexible digital current transformer according to claim 3, characterized in that: The locking groove (103) is in an arc shape and its opening is elastically deformable, and the opening is arranged in an eight-shaped shape.

7. A flexible digital current transformer according to claim 1 or 2, characterized in that: An electromagnetic shielding device is arranged in the hole groove (34).

8. The flexible digital current transformer according to claim 7, characterized in that: The electromagnetic shielding device is an alloy cylinder (11) made of nickel-chromium alloy, and both ends of the Rogowski coil (1) are inserted into the alloy cylinder (11).

9. A flexible digital current transformer according to claim 8, characterized in that: The elastic member (12) abuts against the alloy tube (11) and the abutment ring (13), and the elastic member (12) is a rubber ring.

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