Partial discharge detection device for power grid fault nondestructive diagnosis

Abstract

The invention relates to the technical field of power detection, and provides a partial discharge detection device for power grid fault nondestructive diagnosis, which comprises a mounting rack, an ultrahigh frequency signal sensor and a wire, an electric control case is fixedly mounted on one side of the mounting rack, four detection mechanisms are arranged on the mounting rack, a handle is fixedly connected to the top of the mounting rack, and the ultrahigh frequency signal sensor is fixedly connected with the wire. The detection mechanism comprises a detection bin, buckle assemblies are arranged at the two ends of the detection bin, and a shielding baffle is fixedly connected to the inner wall of the detection bin; through the cooperation of the mounting rack, the sliding rod and the moving block, the position of each detection bin can be adjusted according to the distance between a plurality of parallel cables, so that the adaptability of the detection mechanism and the parallel cables is improved, the peripheries of the parallel cables are conveniently sleeved with the detection bins, synchronous detection is carried out, the detection efficiency is improved, and the human input is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electric power detection, in particular to a partial discharge detection device for non-destructive diagnosis of power grid faults. Background Art

[0002] Partial discharge is a common problem in high-voltage electrical equipment. During the operation of transformers, switchgear, cables and other equipment, partial discharge is easy to occur due to the aging of insulating materials, defects in manufacturing processes, uneven electric field distribution and other reasons. Each partial discharge will affect the insulating medium, causing the insulation strength to gradually decrease. Long-term accumulation may lead to insulation damage, which in turn causes electrical equipment failures and even endangers the safe and stable operation of the power system. Therefore, timely partial discharge detection is very important.

[0003] The ultra-high frequency detection method is one of the common detection methods. It uses the ultra-high frequency electromagnetic wave signals generated by partial discharge for detection. When partial discharge occurs inside electrical equipment, ultra-high frequency electromagnetic waves with frequencies between 300MHz and 3GHz will be excited. These signals are received by ultra-high frequency signal sensors installed on the outside of the equipment, and analyzed and processed to achieve detection and positioning of partial discharge.

[0004] However, when performing partial discharge detection on cables, since the cables are generally multiple and close in distance, the ultra-high frequency electromagnetic wave signals of partial discharge will interfere with each other, making it difficult to determine which specific cable has a partial discharge fault. Some existing devices cannot isolate and synchronously detect multiple parallel cables, resulting in low detection efficiency and high labor input for detection personnel.

[0005] In summary, the inventor provides a partial discharge detection device for non-destructive diagnosis of power grid faults. Summary of the invention

[0006] The present invention provides a partial discharge detection device for non-destructive diagnosis of power grid faults to solve the problems existing in the background technology.

[0007] The technical solution of the present invention is as follows:

[0008] A partial discharge detection device for non-destructive diagnosis of power grid faults, comprising: a mounting frame, an ultra-high frequency signal sensor and a wire, an electric control box is fixedly mounted on one side of the mounting frame, four detection mechanisms are arranged on the mounting frame, and a handle is fixedly connected to the top of the mounting frame;

[0009] The detection mechanism includes a detection chamber, both ends of which are provided with snap-on assemblies, the inner wall of the detection chamber is fixedly connected with a shielding baffle, the top of the inner wall of the shielding baffle is fixedly connected to an ultra-high frequency signal sensor, and the ultra-high frequency signal sensor is electrically connected to an electric control chassis through a wire.

[0010] Furthermore, the buckle assembly includes two pairs of storage grooves respectively opened at both ends of the inner wall of the detection chamber, and sliding grooves are opened on both sides of the inner wall of the storage groove. A guide rod is fixedly connected in the sliding groove, and a slider is slidably connected to the guide rod, and a spring is sleeved on the guide rod, and both ends of the spring are respectively fixedly connected to the side wall of the slider and one end of the sliding groove.

[0011] Furthermore, a claw is rotatably connected to the inner wall of the storage groove, one side of the slider is fixedly connected to the side wall of the claw, two balls are provided on the claw, grooves are provided at both ends of the inner wall of the detection chamber, and rollers are rotatably connected in the grooves.

[0012] Furthermore, a pair of sliding rods are fixedly connected to the inner wall of the mounting frame, and three moving blocks are slidably connected to the pair of sliding rods. The bottoms of the three moving blocks are respectively fixedly connected to the tops of three of the detection bins, and the top of one of the detection bins is fixedly connected to the bottom of one end of the mounting frame.

[0013] Furthermore, a scale ruler is provided on one side of the mounting frame, a locking block is fixedly connected to one side of the top of the moving block, a pointer is provided on the top of the locking block, a bolt is inserted through the side wall of the locking block, and the bolt is threadedly connected to the locking block.

[0014] Furthermore, a display screen is provided on the electronic control chassis, and a power display and a charging socket are provided on one side of the electronic control chassis.

[0015] Furthermore, the detection chamber is made of insulating material, and the shielding baffle is made of metallic copper.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention can adjust the position of each detection chamber according to the distance between multiple parallel cables through the cooperation of the mounting frame, the sliding rod and the moving block, thereby improving the adaptability of the detection mechanism to the parallel cables, and then facilitating the placement of each detection chamber on the periphery of each parallel cable for synchronous detection, thereby improving detection efficiency and reducing manpower input.

[0018] 2. The present invention clamps the cable through the buckle assembly so that the cable is suspended in the detection chamber, preventing the cable wall from contacting the shielding baffle or the ultra-high frequency signal sensor, affecting the shielding effect of the shielding baffle on the electromagnetic wave signal and the detection effect of the ultra-high frequency signal sensor, and the buckle assembly can adapt to cables of different sizes and specifications to improve detection adaptability.

[0019] 3. The present invention isolates the electromagnetic wave signals outside the detection chamber by means of a shielding baffle, thereby preventing the ultra-high frequency signal sensor installed in the detection chamber from being interfered with by external signals and affecting the detection accuracy, thereby ensuring that when multiple detection mechanisms perform synchronous detection on multiple parallel cables, the specific cable and specific location where a partial discharge fault occurs can be determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall appearance of the present invention;

[0021] Figure 2 It is a schematic diagram of the detection mechanism of the present invention;

[0022] Figure 3 is a schematic diagram of a buckle assembly of the present invention;

[0023] Figure 4 is a cross-sectional schematic diagram of a buckle assembly of the present invention;

[0024] Figure 5 It is a plan view of the buckle assembly of the present invention;

[0025] Figure 6 It is a schematic diagram from another viewing angle of the present invention.

[0026] In the figure:

[0027] 1. Mounting frame; 11. Slide bar; 12. Moving block; 13. Scale scale; 14. Locking block; 15. Pointer; 16. Bolt; 2. UHF signal sensor; 3. Wire; 4. Electronic control chassis; 41. Display screen; 42. Power indicator; 43. Charging socket; 5. Detection mechanism; 51. Detection compartment; 52. Buckle assembly; 53. Shielding baffle; 521. Storage slot; 522. Slide slot; 523. Guide rod; 524. Slider; 525. Spring; 526. Claw; 527. Ball; 528. Groove; 529. Roller; 6. Handle; 7. Cable. DETAILED DESCRIPTION

[0028] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] like Figure 1-Figure 6 As shown, the present invention provides a partial discharge detection device for non-destructive diagnosis of power grid faults, comprising: a mounting frame 1, an ultra-high frequency signal sensor 2 and a wire 3, an electric control box 4 is fixedly mounted on one side of the mounting frame 1, four detection mechanisms 5 are arranged on the mounting frame 1, and a handle 6 is fixedly connected to the top of the mounting frame 1;

[0030] The detection mechanism 5 includes a detection chamber 51, and buckle assemblies 52 are provided at both ends of the detection chamber 51. A shielding baffle 53 is fixedly connected to the inner wall of the detection chamber 51. The top of the inner wall of the shielding baffle 53 is fixedly connected to the ultra-high frequency signal sensor 2, and the ultra-high frequency signal sensor 2 is electrically connected to the electric control chassis 4 through the wire 3.

[0031] Among them, the buckle assembly 52 includes two pairs of storage grooves 521 respectively opened at both ends of the inner wall of the detection chamber 51, and slide grooves 522 are opened on both sides of the inner wall of the storage groove 521. A guide rod 523 is fixedly connected in the slide groove 522, and a slider 524 is slidably connected to the guide rod 523, and a spring 525 is sleeved on the guide rod 523, and the two ends of the spring 525 are respectively fixedly connected to the side wall of the slider 524 and one end of the slide groove 522.

[0032] Among them, the inner wall of the storage groove 521 is rotatably connected with a claw 526, one side of the slider 524 is fixedly connected to the side wall of the claw 526, two balls 527 are provided on the claw 526, and grooves 528 are opened at both ends of the inner wall of the detection chamber 51, and a roller 529 is rotatably connected in the groove 528.

[0033] It should be noted that: when the bottom ends of a pair of claws 526 contact the outer wall of the cable 7, the claws 526 rotate at a position rotatably connected to the inner wall of the storage groove 521, and shrink into the storage groove 521. At the same time, the spring 525 is compressed. When the outer wall of the cable 7 contacts the roller 529, the spring 525 pushes the claws 526, so that the ball 527 on the claws 526 contacts the outer wall of the cable 7, thereby putting the detection chamber 51 on the outer periphery of the cable 7, so that the detection chamber 51 is slidably connected to the cable 7, so that the detection chamber 51 can slide along the cable 7, so that the cable 7 is detected by the ultra-high frequency signal sensor 2, and then the precise position of the local discharge of the cable 7 is detected.

[0034] Among them, a pair of sliding rods 11 are fixedly connected to the inner wall of the mounting frame 1, and three moving blocks 12 are slidably connected to the pair of sliding rods 11. The bottoms of the three moving blocks 12 are respectively fixedly connected to the tops of three detection chambers 51, and the top of one of the detection chambers 51 is fixedly connected to the bottom of one end of the mounting frame 1.

[0035] Among them, a scale ruler 13 is set on one side of the mounting frame 1, a locking block 14 is fixedly connected to one side of the top of the moving block 12, a pointer 15 is set on the top of the locking block 14, a bolt 16 is inserted through the side wall of the locking block 14, and the bolt 16 is threadedly connected to the locking block 14.

[0036] It should be noted that: since the distances between the parallel cables 7 are not equal, when performing synchronous detection on several parallel cables 7, the distances between the parallel cables 7 can be measured in advance, and then the moving block 12 can be slid on the slide bar 11, thereby driving the detection chamber 51 to move, and the reference scale 13 can be used to accurately determine the center distances between multiple detection chambers 51, thereby facilitating the simultaneous insertion of multiple cables 7 into the detection chamber 51 for synchronous detection, thereby improving detection efficiency.

[0037] The electric control box 4 is provided with a display screen 41 , and one side of the electric control box 4 is provided with a power display 42 and a charging socket 43 .

[0038] The detection chamber 51 is made of insulating material, and the shielding baffle 53 is made of metallic copper.

[0039] It should be noted that copper has excellent conductivity. When ultra-high frequency electromagnetic waves act on the copper surface, a large induced current will be generated, generating a reverse magnetic field to offset and reflect the electromagnetic waves, thereby effectively blocking the penetration of electromagnetic waves, thereby avoiding electromagnetic wave signal interference between each detection chamber 51, making the detection result accurate.

[0040] Example:

[0041] like Figure 1-Figure 6 As shown, in this embodiment, the inspector first measures the distance between the multiple cables 7 to be inspected in parallel, and then adjusts the distance between each inspection chamber 51 according to the measurement result. The inspector screws the bolt 16 to make the front end of the bolt 16 away from the side of the mounting frame 1, and moves the moving block 12 to slide on the slide bar 11, thereby driving the inspection chamber 51 to move, and through the cooperation of the pointer 15 on the top of the locking block 14 and the scale 13, each inspection chamber 51 is moved to a precise position, and then the bolt 16 is screwed again to make the front end of the bolt 16 contact the side of the mounting frame 1, thereby fixing the moving position of the moving block 12, and then fixing the position of each inspection chamber 51;

[0042] From the above, it can be seen that; through the cooperation of the mounting frame 1, the slide rod 11 and the moving block 12, the position of each detection chamber 51 can be adjusted according to the distance between the multiple parallel cables 7, thereby improving the adaptability of the detection mechanism 5 and the parallel cables 7, and then facilitating the placement of each detection chamber 51 on the periphery of the parallel cables 7 for synchronous detection, thereby improving the detection efficiency.

[0043] like Figure 2-Figure 5As shown, the bottom of the detection chamber 51 is aligned with the cable 7 so that the bottom arc surface of the claw 526 contacts the outer wall of the cable 7, and the detection chamber 51 is pressed down. The claw 526 rotates and retracts into the storage groove 521, and the sliders 524 fixedly connected on both sides of the claw 526 slide in the slide groove 522 along the guide rod 523, and the spring 525 is compressed. The cable 7 continues to move toward the roller 529, and the compression state of the spring 525 is gradually released. Under the push of the spring 525, the ball 527 on the claw 526 contacts the outer wall of the cable 7 and slides until the outer wall of the cable 7 contacts the outer wall of the roller 529. At this time, the cable 7 is inside the detection chamber 51, and the roller 529 and the ball 527 both contact the outer wall of the cable 7, so that the detection chamber 51 and the cable 7 are slidably connected. When the cable 7 is of different sizes, when the outer wall of the roller 529 contacts the outer wall of the cable 7, at least one ball 527 on the claw 526 contacts the outer wall of the cable 7.

[0044] From the above, it can be seen that: the cable 7 is clamped by the buckle assembly 52 so that the cable 7 is suspended in the detection chamber 51, preventing the outer wall of the cable 7 from contacting the shielding baffle 53 or the ultra-high frequency signal sensor 2, thereby affecting the shielding effect of the shielding baffle 53 on the electromagnetic wave signal and the detection effect of the ultra-high frequency signal sensor 2, and the buckle assembly 52 can be adapted to cables 7 of different sizes and specifications, thereby improving the detection adaptability.

[0045] The UHF signal sensor 2 is turned on through the electronic control chassis 4, and the inspector pushes the device to slide on the parallel cables 7 through the handle 6, so that each detection chamber 51 slides on the cable 7, and then each cable 7 is detected through the UHF signal sensor 2 installed in each detection chamber 51. When the electromagnetic wave signal of partial discharge is detected, the shielding baffle 53 will not generate electromagnetic wave signal interference between the parallel cables 7. The inspector can check which detection chamber 51 detects the partial discharge through the display screen 41 on the electronic control chassis 4, so as to determine the specific location.

[0046] From the above, it can be seen that the electromagnetic wave signal outside the detection chamber 51 is isolated by the shielding baffle 53, so as to prevent the ultra-high frequency signal sensor 2 installed in the detection chamber 51 from being interfered by external signals and affecting the detection accuracy, thereby ensuring that when multiple detection mechanisms 5 perform synchronous detection on multiple parallel cables 7, the specific cable 7 and the specific location where the local discharge fault occurs can be determined.

[0047] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A partial discharge detection device for non-destructive diagnosis of power grid faults, comprising: A mounting frame (1), an ultra-high frequency signal sensor (2) and a wire (3), characterized in that: an electric control box (4) is fixedly mounted on one side of the mounting frame (1), four detection mechanisms (5) are arranged on the mounting frame (1), and a handle (6) is fixedly connected to the top of the mounting frame (1); The detection mechanism (5) comprises a detection chamber (51), both ends of the detection chamber (51) are provided with snap-fit ​​assemblies (52), the inner wall of the detection chamber (51) is fixedly connected with a shielding baffle (53), the inner wall top of the shielding baffle (53) is fixedly connected to an ultra-high frequency signal sensor (2), and the ultra-high frequency signal sensor (2) is electrically connected to an electric control cabinet (4) via a wire (3).

2. A partial discharge detection device for non-destructive diagnosis of power grid faults as claimed in claim 1, characterized in that: The buckle assembly (52) comprises two pairs of receiving grooves (521) respectively arranged at the two ends of the inner wall of the detection chamber (51); a slide groove (522) is arranged on both sides of the inner wall of the receiving groove (521); a guide rod (523) is fixedly connected in the slide groove (522); a slider (524) is slidably connected to the guide rod (523); a spring (525) is sleeved on the guide rod (523); and two ends of the spring (525) are respectively fixedly connected to the side wall of the slider (524) and one end of the slide groove (522).

3. A partial discharge detection device for non-destructive diagnosis of power grid faults as claimed in claim 2, characterized in that: The inner wall of the storage groove (521) is rotatably connected to a claw (526), ​​one side of the slider (524) is fixedly connected to the side wall of the claw (526), ​​two balls (527) are arranged on the claw (526), ​​and grooves (528) are provided at both ends of the inner wall of the detection chamber (51), and a roller (529) is rotatably connected in the groove (528).

4. A partial discharge detection device for non-destructive diagnosis of power grid faults as claimed in claim 1, characterized in that: A pair of sliding bars (11) are fixedly connected to the inner wall of the mounting frame (1), and three moving blocks (12) are slidably connected to the pair of sliding bars (11). The bottoms of the three moving blocks (12) are respectively fixedly connected to the tops of three detection chambers (51), and the top of one of the detection chambers (51) is fixedly connected to the bottom of one end of the mounting frame (1).

5. A partial discharge detection device for non-destructive diagnosis of power grid faults as claimed in claim 4, characterized in that: A scale ruler (13) is provided on one side of the mounting frame (1), a locking block (14) is fixedly connected to one side of the top of the moving block (12), a pointer (15) is provided on the top of the locking block (14), a bolt (16) is inserted through the side wall of the locking block (14), and the bolt (16) is threadedly connected to the locking block (14).

6. A partial discharge detection device for non-destructive diagnosis of power grid faults as claimed in claim 1, characterized in that: The electric control box (4) is provided with a display screen (41), and one side of the electric control box (4) is provided with a power display (42) and a charging socket (43).

7. A partial discharge detection device for nondestructive diagnosis of power grid faults as claimed in claim 1, characterized in that: The detection chamber (51) is made of insulating material, and the shielding baffle (53) is made of metallic copper.

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