Current transformer detection primary side line current access device and use method thereof

Abstract

The invention belongs to the technical field of power detection equipment, and particularly relates to a current transformer detection primary side line current access device and a use method thereof.The device comprises a moving mechanism and a wiring mechanism, in the wiring mechanism, the front end of an outer conductive tube is connected with the rear end of a conductive hook, the rear end of the conductive hook is provided with a current output line connecting part, and the inner wall of the outer conductive tube is provided with an insulating layer; the inner conductive rod is arranged in the outer conductive tube in a penetrating mode, the rear end of the inner conductive rod is connected with the driving end of the moving mechanism, and a current input line connecting part is arranged at the rear end of the inner conductive rod. The wiring mechanism is driven by the moving mechanism to move, so that the front end of the conductive hook penetrates into a magnetic core hole of the current transformer, the inner conductive rod is driven by the connecting assembly to move forwards along the outer conductive tube, the front end of the inner conductive rod is in contact with the front end of the conductive hook to form a closed loop, and primary side test current access is completed by the current input line connecting part. The device can replace manual operation to carry out one-time side wire access, and is high in safety coefficient and wiring efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of power detection equipment, and particularly relates to a device for accessing the primary side line current of a current transformer and its usage method. Background Art

[0002] In large factories or manufacturing facilities, due to the need for a large amount of power supply to support the operation of production equipment and machinery, multiple distribution cabinets are set up in different areas to ensure the effective distribution and management of power. Among them, when a current transformer is newly installed or regularly inspected, it is necessary to test parameters such as its polarity, current transformation ratio, volt-ampere characteristic, and 10% error curve. The testing process includes 4 components: tester wiring, secondary side wiring of the current transformer, primary side wiring of the current transformer, and statistics and analysis of test results, which are related to the safe and reliable operation of power equipment. Currently, tester wiring is generally manual wiring. Because the primary side current is large during testing, there are problems such as low safety factor and wiring efficiency for testers. Summary of the Invention

[0003] The purpose of the present invention is to address the above problems existing in the prior art, and provide a device for accessing the primary side line current of a current transformer and its usage method, which can replace manual operation for primary side line access and has a high safety factor and wiring efficiency.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] In a first aspect, the present invention provides a device for accessing the primary side line current of a current transformer. The primary side line current access device includes a moving mechanism and a wiring mechanism disposed thereon. The wiring mechanism includes a connection assembly, an outer conductive tube, an inner conductive rod, and a conductive hook. An insulating layer is provided on the inner wall of the outer conductive tube. The front end of the outer conductive tube is connected to the rear end of the conductive hook, and a current output line connection portion is provided at the rear end of the outer conductive tube. The inner conductive rod passes through the inside of the outer conductive tube, and the rear end of the inner conductive rod is connected to the driving end of the moving mechanism. A current input line connection portion is provided at the rear end of the inner conductive rod;

[0006] The moving mechanism is used to drive the wiring mechanism to move, so that the front end of the conductive hook in the wiring mechanism penetrates into the magnetic core hole of the current transformer;

[0007] The connection assembly is used to drive the inner conductive rod to move forward along the outer conductive tube, so that the front end of the inner conductive rod contacts the front end of the conductive hook.

[0008] External threads are provided at the front end of the inner conductive rod, and internal threads are provided at the front end of the conductive hook. The connection assembly is used to drive the inner conductive rod to rotate and move forward along the outer conductive tube until the external threads at the front end of the inner conductive rod are engaged with the internal threads at the front end of the conductive hook.

[0009] The connecting component includes a first guide rail, a first lead screw, a first nut, a first rotating motor, and a support plate. The support plate is arranged on the moving mechanism, which is used to drive the support plate to move. The first guide rail is arranged on the support plate. The first rotating motor is slidably arranged on the first guide rail. The output end of the first rotating motor is connected to one end of the first lead screw. The other end of the first lead screw is connected to the rear end of the inner conductive rod. A first nut is arranged on the first lead screw, and the first nut is fixedly connected to the first guide rail. The first rotating motor is used to drive the first lead screw to move forward along the first guide rail while rotating.

[0010] A stop block is arranged on the first lead screw at the position between the output end of the first rotating motor and the first nut.

[0011] The moving mechanism includes a mounting base plate, a first driving mechanism arranged at the bottom of the mounting base plate, a second driving mechanism arranged at the top of the mounting base plate, and a third driving mechanism arranged on the second driving mechanism. The support plate is arranged on the third driving mechanism. The first driving mechanism is used to drive the second driving mechanism to move along the Y-axis. The second driving mechanism is used to drive the third driving mechanism to move along the X-axis. The third driving mechanism is used to drive the support plate to move along the Z-axis. The outer conductive tube and the inner conductive rod are both arranged along the Y-axis.

[0012] The second driving mechanism includes a servo motor and a linear slide table module arranged along the X-axis. The servo motor is used to drive the slide on the linear slide table module to move. The third driving mechanism includes a back plate and a second lead screw, a second rotating motor, and a second guide rail arranged thereon. The back plate is arranged on the slide of the linear slide table module. The output end of the second rotating motor is connected to one end of the second lead screw. A second nut is arranged on the second lead screw, and the second nut is fixedly connected to the support plate. The support plate is slidably arranged on the second guide rail, and the second guide rail is arranged along the Z-axis. The second rotating motor is used to drive the support plate to slide along the second guide rail.

[0013] The first driving mechanism is an AGV remote control vehicle.

[0014] The outer conductive tube is fixed on the support plate through a pipe clamp.

[0015] Insulating coatings are provided on the outer walls of the outer conductive tube and the conductive hook.

[0016] In a second aspect, the present invention provides a use method of a primary side line current access device for current transformer detection, and the use method includes:

[0017] S1. Drive the front end of the conductive hook to penetrate into the magnetic core hole of the current transformer through the moving mechanism;

[0018] S2. Drive the inner conductive rod to move forward along the outer conductive tube through the connecting component until the front end of the inner conductive rod contacts the front end of the conductive hook to form a closed loop;

[0019] S3. Input the primary side test current into the closed loop through the current input line connection part to complete the access of the primary side test current.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. The primary side line current access device for current transformer detection of the present invention includes a moving mechanism and a wiring mechanism arranged thereon. The wiring mechanism includes a connecting component, an outer conductive tube, an inner conductive rod, and a conductive hook. An insulating layer is provided on the inner wall of the outer conductive tube. The front end of the outer conductive tube is connected to the rear end of the conductive hook. The rear end of the outer conductive tube is provided with a current output line connection part. The inner conductive rod penetrates inside the outer conductive tube, and the rear end of the inner conductive rod is connected to the driving end of the moving mechanism. The rear end of the inner conductive rod is provided with a current input line connection part; during use, first drive the wiring mechanism to move through the moving mechanism, so that the front end of the conductive hook in the wiring mechanism penetrates into the magnetic core hole of the current transformer, and then use the connecting component to drive the inner conductive rod to move forward along the outer conductive tube, so that the front end of the inner conductive rod contacts the front end of the conductive hook to form a closed loop and complete the access of the primary side test current. This device can replace manual operation for primary side line access, has a simple structure, high safety factor, and high wiring efficiency.

[0022] 2. The primary side line current access device for current transformer detection of the present invention is provided with an external thread at the front end of the inner conductive rod and an internal thread at the front end of the conductive hook. Use the connecting component to drive the inner conductive rod to rotate and move forward along the outer conductive tube until the external thread at the front end of the inner conductive rod is engaged with the internal thread at the front end of the conductive hook. The inner conductive rod and the conductive hook are connected by threads, ensuring the firmness of the connection and not easily disconnecting during the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the device of the present invention.

[0024] Figure 2 is a schematic structural diagram of the wiring mechanism in the present invention.

[0025] Figure 3 is an assembly schematic diagram of the outer conductive tube, the inner conductive rod and the conductive hook in the present invention.

[0026] In the above figure, the moving mechanism 1, the mounting base plate 11, the first driving mechanism 12, the second driving mechanism 13, the servo motor 131, the linear slide module 132, the third driving mechanism 14, the back plate 141, the second lead screw 142, the second rotary motor 143, the second guide rail 144, the wiring mechanism 2, the connecting component 21, the first guide rail 211, the first lead screw 212, the first nut 213, the first rotary motor 214, the support plate 215, the outer conductive tube 22, the current output line connection part 221, the inner conductive rod 23, the current input line connection part 231, the external thread 232, the conductive hook 24, the internal thread 241, and the magnetic core hole 3. Detailed implementation manners

[0027] The present invention will be further described in detail below in combination with the specific implementation manners and the accompanying drawings.

[0028] See Figure 1 , in view of the fact that the wiring of current testers is generally manual wiring at present and the primary side current is relatively large, resulting in low safety factor and wiring efficiency of testers, the present invention provides a device for connecting the primary side line current of a current transformer, which manually connects the primary side line; the primary side line current connection device includes a moving mechanism 1 and a wiring mechanism 2 arranged thereon. The wiring mechanism 2 includes a connecting component 21, an outer conductive tube 22, an inner conductive rod 23, and a conductive hook 24. An insulating layer is provided on the inner wall of the outer conductive tube 22. The front end of the outer conductive tube 22 is connected to the rear end of the conductive hook 24. The rear end of the outer conductive tube 22 is provided with a current output line connection part 221. The inner conductive rod 23 is inserted inside the outer conductive tube 22. The rear end of the inner conductive rod 23 is connected to the driving end of the moving mechanism 1. The rear end of the inner conductive rod 23 is provided with a current input line connection part 231;

[0029] During operation, first, the moving mechanism 1 drives the wiring mechanism 2 to move, so that the front end of the conductive hook 24 in the wiring mechanism 2 is inserted into the magnetic core hole 3 of the current transformer; then, the connecting component 21 drives the inner conductive rod 23 to move forward along the outer conductive tube 22, so that the front end of the inner conductive rod 23 contacts the front end of the conductive hook 24, forming a closed loop; exemplarily, the conductive hook 24 can be set as a U-shaped structure, and the opening of the U-shaped structure is closed by the inner conductive rod 23, thus forming a closed loop; the current input line connection part 231 is connected to the power supply through a current input line, completing the connection of the primary side test current. The current output line connection part 221 is connected to the test equipment through a current output line, and then the test can be started. This device can replace manual connection of the primary side line, has a simple structure, high safety factor, and high wiring efficiency.

[0030] In another preferred embodiment, an external thread 232 is provided at the front end of the inner conductive rod 23, and an internal thread 241 is provided at the front end of the conductive hook 24. The connecting assembly 21 is used to drive the inner conductive rod 23 to move forward along the outer conductive tube 22 while rotating until the external thread 232 at the front end of the inner conductive rod 23 mates with the internal thread 241 at the front end of the conductive hook 24. The inner conductive rod 23 and the conductive hook 24 are threadedly connected, ensuring the connection firmness. Even if the power supply of the primary side line current access device is cut off, the connection is not likely to be disconnected during the test process.

[0031] In another preferred embodiment, the connecting assembly 21 includes a first guide rail 211, a first lead screw 212, a first nut 213, a first rotary motor 214, and a support plate 215. The support plate 215 is disposed on the moving mechanism 1, and the moving mechanism 1 is used to drive the support plate 215 to move. The first guide rail 211 is disposed on the support plate 215, and the first guide rail 211 is arranged in parallel with the outer conductive tube 22. The first rotary motor 214 is fixedly connected to a first slider disposed on the first guide rail 211. The output end of the first rotary motor 214 is fixedly connected to one end of the first lead screw 212. The other end of the first lead screw 212 is connected to the rear end of the inner conductive rod 23 through a coupling. A first nut 213 is disposed on the first lead screw 212, and the first nut 213 is fixedly connected to the first guide rail 211 through a fixing seat. The first rotary motor 214 is used to drive the first lead screw 212 to move forward along the first guide rail 211 while rotating, and the inner conductive rod 23 is pushed forward by the first lead screw 212, so that the inner conductive rod 23 moves forward along the outer conductive tube 22. The first rotary motor 214 is preferably a 42 trapezoidal lead screw stepping motor.

[0032] In another preferred embodiment, a stop block is disposed at a position between the output end of the first rotary motor 214 and the first nut 213 on the first lead screw 212 to limit the forward pushing distance of the first lead screw 212, preventing the conductive hook 24 from being deformed due to excessive forward pushing and affecting the service life of the device.

[0033] In another preferred embodiment, the moving mechanism 1 includes a mounting base plate 11, a first driving mechanism 12 disposed at the bottom of the mounting base plate 11, a second driving mechanism 13 disposed at the top of the mounting base plate 11, and a third driving mechanism 14 disposed on the second driving mechanism 13. A support plate 215 is disposed on the third driving mechanism 14. The first driving mechanism 12 is used to drive the second driving mechanism 13 to move along the Y-axis, the second driving mechanism 13 is used to drive the third driving mechanism 14 to move along the X-axis, and the third driving mechanism 14 is used to drive the support plate 215 to move along the Z-axis. The outer conductive tube 22 and the inner conductive rod 23 are both disposed along the Y-axis. During operation, first, the first driving mechanism 12 and the second driving mechanism 13 cooperate to move the front end of the inner conductive rod 23 to directly below the magnetic core hole 3 of the current transformer, and then the third driving mechanism 14 is controlled to move upward along the Z-axis to insert the front end of the inner conductive rod 23 from below the magnetic core hole 3 of the current transformer into the inside of the magnetic core hole 3 of the current transformer.

[0034] In another preferred embodiment, the second driving mechanism 13 includes a servo motor 131 and a linear slide module 132 disposed along the X-axis. The servo motor 131 is used to drive the slide on the linear slide module 132 to move. The third driving mechanism 14 includes a back plate 141, a second lead screw 142, a second rotary motor 143, and a second guide rail 144 disposed thereon. The back plate 141 is disposed on the slide of the linear slide module 132. The output end of the second rotary motor 143 is connected to one end of the second lead screw 142. A second nut is disposed on the second lead screw 142, and the second nut is fixedly connected to the support plate 215. The support plate 215 is fixedly connected to a second slider disposed on the second guide rail 144. The second guide rail 144 is disposed along the Z-axis. The second rotary motor 143 is used to drive the support plate 215 to slide along the second guide rail 144. The second rotary motor 143 is preferably a 57 stepping motor.

[0035] In another preferred embodiment, the first driving mechanism 12 is an AGV remote control vehicle. An operator remotely controls the movement of the AGV remote control vehicle. Preferably, the AGV remote control vehicle is remotely controlled to move along the Y-axis.

[0036] In another preferred embodiment, the outer conductive tube 22 is fixed to the support plate 215 by a pipe clamp.

[0037] In another preferred embodiment, insulating coatings are provided on the outer walls of both the outer conductive tube 22 and the conductive hook 24.

[0038] The present invention also provides a method for using a current transformer detection primary side line current access device. The method for use is sequentially carried out according to the following steps:

[0039] S1. Drive the front end of the conductive hook 24 to penetrate into the magnetic core hole of the current transformer through the moving mechanism 1;

[0040] S2. Drive the inner conductive rod 23 to move forward along the outer conductive tube 22 through the connecting component 21 until the front end of the inner conductive rod 23 contacts the front end of the conductive hook 24 to form a closed loop;

[0041] S3. Input the primary side test current into the closed loop through the current input wire connecting part 231 to complete the access of the primary side test current. Connect the current output wire connecting part 221 to the test equipment, and then the test can be started.

Claims

1. A primary side line current access device for current transformer detection, characterized in that: The primary side line current access device includes a moving mechanism (1) and a wiring mechanism (2) provided thereon. The wiring mechanism (2) includes a connection component (21), an outer conductive tube (22), an inner conductive rod (23), and a conductive hook (24). An insulating layer is provided on the inner wall of the outer conductive tube (22). The front end of the outer conductive tube (22) is connected to the rear end of the conductive hook (24). A current output line connection part (221) is provided at the rear end of the outer conductive tube (22). The inner conductive rod (23) is arranged inside the outer conductive tube (22). The rear end of the inner conductive rod (23) is connected to the driving end of the moving mechanism (1). A current input line connection part (231) is provided at the rear end of the inner conductive rod (23); The moving mechanism (1) is used to drive the wiring mechanism (2) to move, so that the front end of the conductive hook (24) in the wiring mechanism (2) penetrates into the magnetic core hole of the current transformer; The connection component (21) is used to drive the inner conductive rod (23) to move forward along the outer conductive tube (22), so that the front end of the inner conductive rod (23) contacts the front end of the conductive hook (24).

2. The primary side line current access device for current transformer detection according to claim 1, characterized in that: An external thread (232) is provided at the front end of the inner conductive rod (23), and an internal thread (241) is provided at the front end of the conductive hook (24). The connection component (21) is used to drive the inner conductive rod (23) to rotate and move forward along the outer conductive tube (22) until the external thread (232) at the front end of the inner conductive rod (23) cooperates with the internal thread (241) at the front end of the conductive hook (24).

3. The primary side line current access device for current transformer detection according to claim 2, characterized in that: The connection component (21) includes a first guide rail (211), a first lead screw (212), a first nut (213), a first rotary motor (214), and a support plate (215). The support plate (215) is arranged on the moving mechanism (1). The moving mechanism (1) is used to drive the support plate (215) to move. The first guide rail (211) is arranged on the support plate (215). The first rotary motor (214) is slidably arranged on the first guide rail (211). The output end of the first rotary motor (214) is connected to one end of the first lead screw (212). The other end of the first lead screw (212) is connected to the rear end of the inner conductive rod (23). A first nut (213) is arranged on the first lead screw (212). The first nut (213) is fixedly connected to the first guide rail (211). The first rotary motor (214) is used to drive the first lead screw (212) to rotate and move forward along the first guide rail (211).

4. The primary side line current access device for current transformer detection according to claim 3, characterized in that: A stopper is provided at a position on the first lead screw (212) between the output end of the first rotary motor (214) and the first nut (213).

5. The primary side line current access device for current transformer detection according to claim 3 or 4, characterized in that: The moving mechanism (1) includes a mounting base plate (11), a first driving mechanism (12) provided at the bottom of the mounting base plate (11), a second driving mechanism (13) provided at the top of the mounting base plate (11), and a third driving mechanism (14) provided on the second driving mechanism (13). The support plate (215) is provided on the third driving mechanism (14). The first driving mechanism (12) is used to drive the second driving mechanism (13) to move along the Y-axis. The second driving mechanism (13) is used to drive the third driving mechanism (14) to move along the X-axis. The third driving mechanism (14) is used to drive the support plate (215) to move along the Z-axis. The outer conductive tube (22) and the inner conductive rod (23) are both arranged along the Y-axis.

6. The primary side line current access device for current transformer detection according to claim 5, characterized in that: The second driving mechanism (13) includes a servo motor (131) and a linear slide table module (132) arranged along the X-axis. The servo motor (131) is used to drive the slide on the linear slide table module (132) to move. The third driving mechanism (14) includes a back plate (141) and a second lead screw (142), a second rotary motor (143), and a second guide rail (144) provided thereon. The back plate (141) is arranged on the slide of the linear slide table module (132). The output end of the second rotary motor (143) is connected to one end of the second lead screw (142). A second nut is provided on the second lead screw (142). The second nut is fixedly connected to the support plate (215). The support plate (215) is slidably arranged on the second guide rail (144). The second guide rail (144) is arranged along the Z-axis. The second rotary motor (143) is used to drive the support plate (215) to slide along the second guide rail (144).

7. The primary side line current access device for current transformer detection according to claim 5, characterized in that: The first driving mechanism (12) is an AGV remote control vehicle.

8. The primary side line current access device for current transformer detection according to claim 5, characterized in that: The outer conductive tube (22) is fixed to the support plate (215) by a pipe clamp.

9. The primary side line current access device for current transformer detection according to any one of claims 1-4, characterized in that: Insulating coatings are provided on the outer walls of the outer conductive tube (22) and the conductive hook (24).

10. The method for using the primary side line current access device for current transformer detection according to claim 1, characterized in that: The method for using includes: S1. Driving the front end of the conductive hook (24) to penetrate into the magnetic core hole of the current transformer through the moving mechanism (1); S2. Drive the inner conductive rod (23) to move forward along the outer conductive tube (22) through the connecting component (21) until the front end of the inner conductive rod (23) contacts the front end of the conductive hook (24) to form a closed loop; S3. Input the primary side test current into the closed loop through the current input wire connection part (231) to complete the access of the primary side test current.

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