AC power grid fault current waveform recording device

Abstract

The invention belongs to the technical field of alternating-current power grid fault current waveform recording, and particularly relates to an alternating-current power grid fault current waveform recording device which comprises a recording unit, an adjusting unit is arranged on the side face of the recording unit, and a clamping unit is arranged on the other side of the adjusting unit. Detection work can be carried out only when the recording unit is fixed below a monitored cable, if the monitored cable is located outside, the monitored cable can be connected with a telegraph pole through the clamping unit, meanwhile, the height of the recording unit can be adjusted through the arranged fixing strip, and the positioning strip can slide relative to the positioning square barrel; the horizontal position of the recording unit can be adjusted, and meanwhile, the angle of the recording unit can be adjusted relative to the lantern ring through the fixing shaft, so that the recording unit can be adjusted in multiple dimensions, and the recording unit can be located at a proper position so as to conveniently detect a monitored cable.

Description

Technical Field

[0001] The invention belongs to the technical field of AC power grid fault current waveform recording, and in particular relates to an AC power grid fault current waveform recording device. Background Art

[0002] The fault current in the constructed AC power grid is obtained and recorded by setting a fault recorder in the distribution cabinet; when a system fault occurs, the fault recorder can automatically and accurately record the changes in various electrical quantities before and after the fault. The analysis and comparison of these electrical quantities plays an important role in analyzing and handling accidents, judging whether the protection is operating correctly, and improving the safe operation level of the power system.

[0003] The fault recorder uses the induced current provided by the voltage transformer and current transformer to convert the analog signal into digital quantity through the A / D converter, and then sends it to the controller for storage. The background analysis program displays the waveform curve chart, primary / secondary recording values, etc.

[0004] When the existing waveform recording device is working, the equipment needs to be fixedly set near the monitored cable so that the detection component of the waveform recording device is close to the monitored cable. However, the existing monitored cables are usually in two situations. One is the monitored cable during laboratory experiments, which is convenient for controlling the detection component to be close to the monitored cable for easy detection. The other is the monitored cable used in daily outdoor use. The outdoor environment is more complicated, and the position of the detection component of the existing waveform recording device is generally not convenient to adjust, and it may be difficult to control the detection component close to the monitored cable. Summary of the invention

[0005] The purpose of the present invention is to provide an AC power grid fault current waveform recording device to solve the above problems. During use, the recording unit needs to be fixed under the monitored cable to perform detection work. If the monitored cable is outside, it can be connected to the electric pole by using the clamping unit. At the same time, the height of the recording unit can be adjusted by using the set fixing bar, and the positioning bar can slide relative to the positioning square tube, so that the horizontal position of the recording unit can be adjusted. At the same time, the recording unit can adjust the angle relative to the ring through the fixed axis. In summary, the recording unit can be adjusted in multiple dimensions, so that the recording unit can be placed in a suitable position to facilitate the detection of the monitored cable. The specific technical scheme is as follows:

[0006] An AC power grid fault current waveform recording device comprises a recording unit, an adjusting unit is arranged on one side of the recording unit, and a clamping unit is arranged on the other side of the adjusting unit;

[0007] The adjustment unit comprises:

[0008] A fixed shaft is installed at the bottom of the recording unit, and a collar is movably sleeved on the outer side of the fixed shaft;

[0009] A positioning square tube, one end of which is fixedly connected to the sleeve ring, and a positioning strip is slidably arranged inside the positioning square tube;

[0010] A fixing bar is arranged at the other end of the positioning bar, and the other side of the fixing bar is connected to the clamping unit.

[0011] Preferably, the recording unit comprises a main detection box, a secondary detection box, an elastic member, an external permanent magnet and a connecting rod;

[0012] The main detection box is provided with an electrically connected A / D converter and a controller inside, an elastic member is installed on the top of the main detection box, an external permanent magnet is fixedly installed on the top of the elastic member, and the external permanent magnet is arranged below the monitored cable, and one end of the connecting rod is connected to the elastic member;

[0013] The secondary detection box is fixedly installed on the top of the main detection box, and an induction coil is arranged inside the secondary detection box, the induction coil is electrically connected to the A / D converter, and the other end of the elastic member extends toward the inside of the secondary detection box and is connected to a built-in permanent magnet;

[0014] The external permanent magnet can move when a fault current is generated in the monitored cable, and drive the internal permanent magnet to move on the side of the induction coil through the elastic member and the connecting rod. Then, the induction coil can generate an induced current when the internal permanent magnet moves, and transmit the current signal to the A / D converter and the controller.

[0015] Preferably, support bases are installed at the four corners of the bottom of the main detection box, and the support base includes a fixed block, an adjusting rod and a base. The fixed block is fixedly installed on the bottom of the main detection box, the adjusting rod is threadedly connected to the inside of the fixed block, and the bottom end of the adjusting rod extends outward and is fixedly connected to the base.

[0016] Preferably, the fixed shaft is fixedly connected to the bottom of the main detection box, and a nut is threadedly connected to the bottom end of the fixed shaft.

[0017] Preferably, a plurality of first mounting holes penetrating inside and outside are formed at the bottom of the positioning square tube, a second mounting hole penetrating up and down is formed at the end of the positioning strip, and a pin is provided between one of the first mounting holes and the second mounting hole.

[0018] Preferably, the interior of the fixing strip is provided with an empty groove which passes through from left to right, a slider is slidably arranged in the empty groove, a screw rod is rotatably connected to the interior of the empty groove, the outer side of the screw rod is threadedly connected to the slider, and the top end of the screw rod extends outward and is fixedly connected to a first knob, the end of the positioning strip is fixedly connected to the slider, and a support member is arranged below the end of the positioning strip, and the side surface of the support member is in contact with the fixing strip.

[0019] Preferably, the clamping unit includes a mounting bar and a connecting frame, the connecting frame is fixedly mounted on the side of the mounting bar, and the other side of the connecting frame is fixedly connected to the fixing bar, a movable groove is provided on the other side of the mounting bar, and two movable blocks are slidably arranged on the inner wall of the movable groove.

[0020] Preferably, a bidirectional threaded rod is rotatably connected to the inner wall of the movable groove, the bidirectional threaded rod is threadedly connected to the two movable blocks, and the ends of the two movable blocks extend outward and are fixedly connected to two clamping rings arranged opposite to each other.

[0021] Preferably, the end of the bidirectional threaded rod extends outward and is fixedly connected to a second knob.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] During use, the recording unit needs to be fixed under the monitored cable before detection can be carried out. If the monitored cable is outside, the clamping unit can be used to connect it to the pole. At the same time, the height of the recording unit can be adjusted using the set fixing bar, and the positioning bar can slide relative to the positioning square tube, so the horizontal position of the recording unit can be adjusted. At the same time, the recording unit can adjust the angle relative to the ring through the fixed axis. In summary, the recording unit can be adjusted in multiple dimensions, so that the recording unit can be in a suitable position to facilitate the detection of the monitored cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the bottom structure of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the regulating unit of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the fixing strip of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the clamping unit of the present invention;

[0029] Figure 6 It is a structural schematic diagram of the support base of the present invention.

[0030] In the figure: 1. recording unit; 11. main detection box; 12. secondary detection box; 13. elastic member; 14. external permanent magnet; 15. connecting rod; 16. support seat; 161. fixing block; 162. adjusting rod; 163. base; 2. adjusting unit; 21. fixing shaft; 22. sleeve ring; 23. positioning square tube; 231. first mounting hole; 24. positioning bar; 241. second mounting hole; 242. support member; 25. fixing bar; 251. slider; 252. screw rod; 3. clamping unit; 31. mounting bar; 32. connecting frame; 33. moving block; 34. bidirectional threaded rod; 35. clamping ring. DETAILED DESCRIPTION

[0031] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment 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.

[0032] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0033] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] The embodiment of the present invention discloses a device for recording fault current waveform of an AC power grid. Figure 1-6 As shown, it includes a recording unit 1, an adjusting unit 2 is arranged on the side of the recording unit 1, and a clamping unit 3 is arranged on the other side of the adjusting unit 2;

[0036] The adjustment unit 2 comprises:

[0037] A fixed shaft 21 is installed at the bottom of the recording unit 1, and a collar 22 is movably sleeved on the outer side of the fixed shaft 21;

[0038] A positioning square tube 23, one end of which is fixedly connected to the collar 22, and a positioning strip 24 is slidably arranged inside the positioning square tube 23;

[0039] The fixing bar 25 is arranged at the other end of the positioning bar 24 , and the other side of the fixing bar 25 is connected to the clamping unit 3 .

[0040] During use, the recording unit 1 needs to be fixed under the monitored cable to carry out detection work. If the monitored cable is outside, the clamping unit 3 can be used to connect it to the utility pole. At the same time, the height of the recording unit 1 can be adjusted by using the set fixing bar 25, and the positioning bar 24 can slide relative to the positioning square tube 23, so that the horizontal position of the recording unit 1 can be adjusted. At the same time, the recording unit 1 can adjust the angle relative to the ring 22 through the fixed axis 21. In summary, the recording unit 1 can be adjusted in multiple dimensions, so that the recording unit 1 can be in a suitable position to facilitate the detection of the monitored cable.

[0041] It is particularly disclosed that the recording unit 1 comprises a main detection box 11, a secondary detection box 12, an elastic member 13, an external permanent magnet 14 and a connecting rod 15;

[0042] An electrically connected A / D converter and controller are provided inside the main detection box 11, an elastic member 13 is installed on the top of the main detection box 11, an external permanent magnet 14 is fixedly installed on the top of the elastic member 13, and the external permanent magnet 14 is arranged below the monitored cable, and one end of the connecting rod 15 is connected to the elastic member 13;

[0043] The secondary detection box 12 is fixedly installed on the top of the main detection box 11, and an induction coil is arranged inside the secondary detection box 12, and the induction coil is electrically connected to the A / D converter. The other end of the elastic member 13 extends toward the inside of the secondary detection box 12 and is connected to a built-in permanent magnet;

[0044] The external permanent magnet 14 can move when a fault current is generated in the monitored cable, and drive the internal permanent magnet to move on the side of the induction coil through the elastic member 13 and the connecting rod 15. Then, the induction coil can generate an induced current when the internal permanent magnet moves, and transmit the current signal to the A / D converter and controller.

[0045] Furthermore, a support base 16 is installed at the four corners of the bottom of the main detection box 11, and the support base 16 includes a fixed block 161, an adjusting rod 162 and a base 163. The fixed block 161 is fixedly installed at the bottom of the main detection box 11, and the adjusting rod 162 is threadedly connected to the inside of the fixed block 161, and the bottom end of the adjusting rod 162 extends outward and is fixedly connected to the base 163.

[0046] Furthermore, the fixed shaft 21 is fixedly connected to the bottom of the main detection box 11 , and a nut is threadedly connected to the bottom end of the fixed shaft 21 .

[0047] If the monitored cable is in the laboratory, the nut at the bottom end of the fixed shaft 21 is rotated and removed to separate the adjustment unit 2 from the recording unit 1. At this time, the support seat 16 installed at the four corners of the bottom of the main detection box 11 can be used for support. At the same time, the adjusting rod 162 is threadedly connected to the inside of the fixed block 161, and the bottom end of the adjusting rod 162 extends outward and is fixedly connected to the base 163. When the adjusting rod 162 and the base 163 are rotated, the height of the main detection box 11 can be adjusted to facilitate its detection.

[0048] Furthermore, a plurality of first mounting holes 231 extending inside and outside are formed at the bottom of the positioning square tube 23 , a second mounting hole 241 extending from top to bottom is formed at the end of the positioning bar 24 , and a pin is provided between one of the first mounting holes 231 and the second mounting hole 241 .

[0049] By providing the first mounting hole 231 and the second mounting hole 241 , after the positioning bar 24 moves relative to the positioning square tube 23 , it can be fixed by using the pin shaft between the first mounting hole 231 and the second mounting hole 241 .

[0050] It is particularly disclosed that an empty groove is opened inside the fixing strip 25, which passes through from left to right, and a slider 251 is slidably arranged in the empty groove. A screw rod 252 is rotatably connected inside the empty groove. The outer side of the screw rod 252 is threadedly connected to the slider 251, and the top of the screw rod 252 extends outward and is fixedly connected to the first knob. The end of the positioning strip 24 is fixedly connected to the slider 251, and a support member 242 is arranged below the end of the positioning strip 24, and the side of the support member 242 is in contact with the fixing strip 25.

[0051] When the screw rod 252 is rotated, the slider 251 outside the screw rod 252 can slide inside the empty groove, so that the height of the positioning bar 24 connected to the slider 251 can be adjusted, and then the height of the recording unit 1 can be adjusted. At the same time, the support member 242 is provided to make the positioning bar 24 more stable.

[0052] It is particularly disclosed that the clamping unit 3 includes a mounting bar 31 and a connecting frame 32. The connecting frame 32 is fixedly installed on the side of the mounting bar 31, and the other side of the connecting frame 32 is fixedly connected to the fixing bar 25. A movable groove is opened on the other side of the mounting bar 31, and two movable blocks 33 are slidably arranged on the inner wall of the movable groove.

[0053] Furthermore, a bidirectional threaded rod 34 is rotatably connected to the inner wall of the movable groove, and the bidirectional threaded rod 34 is threadedly connected to the two movable blocks 33 , and the ends of the two movable blocks 33 extend outward and are fixedly connected to two clamping rings 35 arranged opposite to each other.

[0054] Furthermore, the end of the bidirectional threaded rod 34 extends outward and is fixedly connected to a second knob.

[0055] When the second knob is turned, the bidirectional threaded rod 34 can be driven to rotate, so that the two moving blocks 33 outside the bidirectional threaded rod 34 move in the opposite direction, so that the two oppositely arranged clamping rings 35 can be opened and clamped, thereby playing an effective clamping and fixing role.

[0056] During use, the recording unit 1 needs to be fixed under the monitored cable to perform the detection work. If the monitored cable is outside, the clamping unit 3 can be used to connect it to the electric pole. At the same time, the height of the recording unit 1 can be adjusted by using the set fixing bar 25, and the positioning bar 24 can slide relative to the positioning square tube 23, so that the horizontal position of the recording unit 1 can be adjusted. At the same time, the recording unit 1 can adjust the angle relative to the ring 22 through the fixed shaft 21. In summary, the recording unit 1 can be adjusted in multiple dimensions, so that the recording unit 1 can be placed in a suitable position to facilitate the detection of the monitored cable;

[0057] If the monitored cable is in the laboratory, the nut at the bottom end of the fixed shaft 21 is rotated and removed to separate the adjustment unit 2 from the recording unit 1. At this time, the support seat 16 installed at the four corners of the bottom of the main detection box 11 can be used for support. At the same time, the adjusting rod 162 is threadedly connected to the inside of the fixed block 161, and the bottom end of the adjusting rod 162 extends outward and is fixedly connected to the base 163. When the adjusting rod 162 and the base 163 are rotated, the height of the main detection box 11 can be adjusted to facilitate its detection.

[0058] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An AC power grid fault current waveform recording device, comprising a recording unit (1), characterized in that: An adjusting unit (2) is arranged on a side of the recording unit (1), and a clamping unit (3) is arranged on the other side of the adjusting unit (2); The regulating unit (2) comprises: A fixed shaft (21) is mounted on the bottom of the recording unit (1), and a collar (22) is movably sleeved on the outer side of the fixed shaft (21); A positioning square tube (23), one end of which is fixedly connected to the sleeve ring (22), and a positioning strip (24) is slidably arranged inside the positioning square tube (23); A fixing bar (25), the fixing bar (25) is arranged at the other end of the positioning bar (24), and the other side of the fixing bar (25) is connected to the clamping unit (3).

2. The AC power grid fault current waveform recording device according to claim 1, characterized in that: The recording unit (1) comprises a main detection box (11), a secondary detection box (12), an elastic member (13), an external permanent magnet (14) and a connecting rod (15); An electrically connected A / D converter and a controller are arranged inside the main detection box (11); an elastic member (13) is installed on the top of the main detection box (11); an external permanent magnet (14) is fixedly installed on the top of the elastic member (13); and the external permanent magnet (14) is arranged below the monitored cable; and one end of a connecting rod (15) is connected to the elastic member (13); The secondary detection box (12) is fixedly mounted on the top of the main detection box (11), and an induction coil is arranged inside the secondary detection box (12), the induction coil is electrically connected to the A / D converter, and the other end of the elastic member (13) extends toward the inside of the secondary detection box (12) and is connected to a built-in permanent magnet; The external permanent magnet (14) can move when a fault current is generated in the monitored cable, and drive the internal permanent magnet to move on the side of the induction coil through the elastic member (13) and the connecting rod (15), so that the induction coil can generate an induced current when the internal permanent magnet moves, and transmit the current signal to the A / D converter and the controller.

3. The AC power grid fault current waveform recording device according to claim 2, characterized in that: A support base (16) is installed at the four corners of the bottom of the main detection box (11), and the support base (16) comprises a fixed block (161), an adjusting rod (162) and a base (163). The fixed block (161) is fixedly installed at the bottom of the main detection box (11), the adjusting rod (162) is threadedly connected to the inside of the fixed block (161), and the bottom end of the adjusting rod (162) extends outward and is fixedly connected to the base (163).

4. The AC power grid fault current waveform recording device according to claim 2, characterized in that: The fixed shaft (21) is fixedly connected to the bottom of the main detection box (11), and a nut is threadedly connected to the bottom end of the fixed shaft (21).

5. The AC power grid fault current waveform recording device according to claim 1, characterized in that: The bottom of the positioning square tube (23) is provided with a plurality of first mounting holes (231) that penetrate inside and outside, the end of the positioning strip (24) is provided with a second mounting hole (241) that penetrates up and down, and a pin is provided between one of the first mounting holes (231) and the second mounting hole (241).

6. The AC power grid fault current waveform recording device according to claim 1, characterized in that: The fixing bar (25) is provided with an empty slot extending through the left and right sides, a slider (251) is slidably arranged in the empty slot, a screw rod (252) is rotatably connected to the inside of the empty slot, the outer side of the screw rod (252) is threadedly connected to the slider (251), and the top end of the screw rod (252) extends outward and is fixedly connected to a first knob, the end of the positioning bar (24) is fixedly connected to the slider (251), and a support member (242) is arranged below the end of the positioning bar (24), and the side surface of the support member (242) is in contact with the fixing bar (25).

7. The AC power grid fault current waveform recording device according to claim 1, characterized in that: The clamping unit (3) comprises a mounting bar (31) and a connecting frame (32); the connecting frame (32) is fixedly mounted on a side of the mounting bar (31), and the other side of the connecting frame (32) is fixedly connected to the fixing bar (25); a movable groove is provided on the other side of the mounting bar (31), and two movable blocks (33) are slidably arranged on the inner wall of the movable groove.

8. The AC power grid fault current waveform recording device according to claim 7, characterized in that: A bidirectional threaded rod (34) is rotatably connected to the inner wall of the movable groove, the bidirectional threaded rod (34) is threadedly connected to the two movable blocks (33), and the ends of the two movable blocks (33) extend outwards and are fixedly connected to two clamping rings (35) arranged opposite to each other.

9. The AC power grid fault current waveform recording device according to claim 8, characterized in that: The end of the bidirectional threaded rod (34) extends outward and is fixedly connected to a second knob.

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