Insulation detection device for electrical system of thermal power plant

Abstract

The utility model discloses a thermal power plant electrical system insulation detection device, and relates to the insulation detection technology field, the thermal power plant electrical system insulation detection device comprises a vibration table and a cable, a cylinder is installed above the vibration table, the cylinder is filled with iron sand, the inner wall of the cylinder is fixedly connected with a plurality of poking plates, two sides of the cylinder are respectively embedded with a side plate, and the side plates are connected with the vibration table. The cable penetrates through the side plate and the cylinder, a guide wheel seat is mounted on one side of the vibration table, a mounting table is mounted in front of the vibration table, an insulation resistance tester is fixedly mounted at the top of the mounting table, and a driving mechanism is mounted in front of the cylinder; the cable is pulled by the guide wheel seat to reversely penetrate through the iron sand again, the lower surface of the cable can be adjusted to be upward so that the iron sand can permeate into a crack to detect the insulativity, meanwhile, the driving mechanism can drive the cylinder to rotate so that the iron sand can roll to improve the mobility, and therefore the iron sand can permeate into the crack in a cable insulating layer more sufficiently. And the accuracy of cable insulation detection is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of insulation detection, in particular to an insulation detection device for the electrical system of a thermal power plant. Background Technique

[0002] The electrical system of a thermal power plant mainly consists of generators, transformers, switchgear, cables, etc., and is mainly used to convert the energy of fuels such as coal, oil, and natural gas into electrical energy for supply to users. For electrical safety, especially for the cables used to transmit electrical energy, insulation detection needs to be carried out before use to ensure that the cables are intact and can be used normally;

[0003] After retrieval, Chinese Patent No. CN213986706U discloses a cable insulation detection device, which includes a resistance tester, a collection box, a vibration table, an insulation box, and a cable reel for winding and reeling one end of the cable; the fixed part at the bottom of the vibration table is installed at the center of the inner bottom surface of the collection box, and the upper surface of the vibrating part at the top of the vibration table is fixedly connected to the outer bottom surface of the insulation box; through holes are provided at the centers of the corresponding two side walls of the insulation box, and insulating rubber sleeves with inner walls adapted to the movement of the cable are hermetically fixed in the through holes. Iron sand is filled in the insulation box, and a conductive plate is fixed on the inner bottom surface of the insulation box; one end of the conductive plate is connected to a conductive rod passing through the side wall of the insulation box, and the two measurement connectors of the resistance tester are respectively connected to the conductive rod and the inner core of the other end of the cable in a corresponding manner;

[0004] The above-mentioned disclosed document vibrates the iron sand in the insulation box through a vibration table, so that the iron sand can penetrate into the gaps of the cable insulation layer to form a conductive circuit, and then the insulation detection is realized through a resistance tester. However, there are some deficiencies in actual use. For example, as the detection progresses, the iron sand in the insulation box will gradually be compacted and piled up at the bottom of the insulation due to vibration. At the same time, when the cable passes through the iron sand in the insulation box, affected by gravity, if there are cracks under the cable, it is very difficult for the compacted and piled-up iron sand to penetrate upward into the cracks, and the insulation of the cable cannot be effectively detected.

[0005] To solve the above deficiencies, this application proposes an insulation detection device for the electrical system of a thermal power plant. Content of the Utility Model

[0006] The utility model provides an insulation detection device for the electrical system of a thermal power plant to solve the above technical problems.

[0007] To solve the above technical problems, a kind of insulation detection device for the electrical system of a thermal power plant provided by the utility model includes a vibration table and a cable. The cable is located above the vibration table. A cylinder is installed above the vibration table. The inside of the cylinder is filled with iron sand. A plurality of baffle plates are fixedly connected to the inner wall of the cylinder. A side plate is inlaid and installed on each of the two sides of the cylinder, and the cylinder is movably connected to the side plate. The cable penetrates through the side plate and the cylinder. A metal rod is fixedly connected between the two side plates. A guide wheel seat is installed on one side of the vibration table. An installation table is installed in front of the vibration table. An insulation resistance tester is fixedly installed on the top of the installation table. Two test ends of the insulation resistance tester are electrically connected to the wiring terminal of the metal rod and the inner core of one end of the cable through wires respectively. A driving mechanism is installed in front of the cylinder. A fixed support is installed outside the side plate.

[0008] Preferably, the driving mechanism includes a reduction motor. The reduction motor is fixedly installed on the top of the installation table. The reduction motor is located on one side of the insulation resistance tester. The output shaft of the reduction motor is fixedly connected with a pulley. A belt track is fixedly connected to the outer end of the cylinder. The pulley and the belt track are connected to each other through a belt.

[0009] Preferably, the guide wheel seat is composed of a fixed seat and a guide wheel. The guide wheel is movably connected to the top of the fixed seat through a rotating shaft.

[0010] Preferably, the fixed support is composed of a base and four brackets. The base is fixedly connected to the top of the vibration table. The four brackets are respectively fixedly connected to the outside of the two side plates. The brackets are fixedly connected to the top of the base.

[0011] Preferably, a recovery box is fixedly connected to the outside of the side plate. The cable penetrates through the recovery box, and a box cover is inserted at the bottom of the recovery box.

[0012] Preferably, a plug cap is connected to the top of the cylinder through a thread.

[0013] Compared with the related technology, a kind of insulation detection device for the electrical system of a thermal power plant provided by the utility model has the following

[0014] Beneficial effects:

[0015] The side plates are fixed above the vibrating table through fixed supports, while the cylinder is movably connected between the two side plates. Therefore, the vibrating table can vibrate the iron sand in the cylinder so that it seeps into the cracks of the cable insulation layer. Once the iron sand seeps into the cracks and contacts the inner core of the cable, a circuit will be generated between the test ends of the insulation resistance tester, and then the insulation problem of the cable can be detected. When the cable passes through the iron sand in the cylinder, it is pulled by the guide wheel seat and passes through the iron sand in the reverse direction. The lower surface of the cable can also be adjusted upward to facilitate the iron sand to seep into the cracks to detect the insulation. At the same time, the driving mechanism will also drive the cylinder to rotate. When the cylinder rotates, the iron sand compacted and accumulated below is flipped to the upper part by the baffle plate, avoiding the excessive compaction and accumulation of the iron sand and reducing its fluidity, so that the iron sand can more fully seep into all possible cracks on the cable insulation layer, improving the accuracy of cable insulation detection. Description of the Drawings

[0016] Figure 1 Fig. is a schematic diagram of the overall structure of an insulation detection device for the electrical system of a thermal power plant proposed by the present utility model;

[0017] Figure 2 Fig. is a side view cross-sectional view of the cylinder of an insulation detection device for the electrical system of a thermal power plant proposed by the present utility model;

[0018] Figure 3 Fig. is a front view cross-sectional view of the side plate and the recovery box of an insulation detection device for the electrical system of a thermal power plant proposed by the present utility model;

[0019] Figure 4 Fig. is a schematic diagram of the structure of the fixed support of an insulation detection device for the electrical system of a thermal power plant proposed by the present utility model;

[0020] Figure 5 Fig. is a schematic diagram of the structure of the guide wheel seat of an insulation detection device for the electrical system of a thermal power plant proposed by the present utility model.

[0021] Reference numerals in the figures: 1, vibrating table; 2, cylinder; 3, plug cap; 4, side plate; 5, cable; 6, recovery box; 7, box cover; 8, iron sand; 9, baffle plate; 10, metal rod; 11, fixed seat; 12, guide wheel; 13, bracket; 14, base; 15, installation table; 16, insulation resistance tester; 17, reduction motor; 18, pulley; 19, belt track; 20, belt. Detailed Embodiment

[0022] Embodiment, consisting of Figures 1-5Provided that, the utility model includes a vibration table 1 and a cable 5. The cable 5 is located above the vibration table 1. A cylinder 2 is installed above the vibration table 1. The inside of the cylinder 2 is filled with iron sand 8. A plurality of baffle plates 9 are fixedly connected to the inner wall of the cylinder 2. One side plate 4 is respectively inlaid and installed on both sides of the cylinder 2, and the cylinder 2 is movably connected to the side plate 4. The cable 5 penetrates through the side plate 4 and the cylinder 2. A metal rod 10 is fixedly connected between the two side plates 4. A guide wheel seat is installed on one side of the vibration table 1. An installation table 15 is installed in front of the vibration table 1. An insulation resistance tester 16 is fixedly installed on the top of the installation table 15. Two test ends of the insulation resistance tester 16 are electrically connected to the wiring terminal of the metal rod 10 and the inner core of one end of the cable 5 through wires. A driving mechanism is installed in front of the cylinder 2. A fixed support is installed outside the side plate 4.

[0023] The vibration table 1 and the insulation resistance tester 16 are products of the prior art, so they will not be described in detail here.

[0024] Both the cylinder 2 and the side plate 4 are made of insulating materials. An annular groove is provided on the outer wall of the side plate 2, which can fit with the connection part on the side of the cylinder 2, so that the connection part between the cylinder 2 and the side plate 4 has a good sealing effect, and at the same time, it will not affect the rotation of the cylinder 2.

[0025] The driving mechanism includes a reduction motor 17. The reduction motor 17 is fixedly installed on the top of the installation table 15. The reduction motor 17 is located on one side of the insulation resistance tester 16. The output shaft of the reduction motor 17 is fixedly connected with a pulley 18. A belt track 19 is fixedly connected to the outer end of the cylinder 2. The pulley 18 and the belt track 19 are connected to each other through a belt 20. The driving mechanism can drive the cylinder 2 to rotate. Since it is connected by belt 20 transmission, even if the cylinder 2 vibrates due to the drive of the vibration table 1, it will not affect the normal operation of the flexible belt 20.

[0026] The guide wheel seat is composed of a fixed seat 11 and a guide wheel 12. The guide wheel 12 is movably connected to the top of the fixed seat 11 through a rotating shaft. After the cable 5 initially passes through the cylinder 2, it is wound around the guide wheel 12 and then reversely passes through the cylinder 2 again. Back and forth, the upper and lower layers of the outer surface of the cable 5 are swapped, so that when the iron sand 8 vibrates, it can be gradually compacted downward under the action of gravity. If there is a crack on the outer surface of the cable 5, the iron sand 8 will seep into the crack, avoiding the problem that the iron sand compacted and accumulated below the cable 5 cannot seep upward into the crack below the insulation layer of the cable 5.

[0027] The fixed support is composed of a base 14 and four brackets 13. The base 14 is fixedly connected to the top of the vibration table 1. The four brackets 13 are respectively fixedly connected to the outside of the two side panels 4. The brackets 13 are fixedly connected to the top of the base 14. The fixed brackets are mainly fixedly connected to the side panels 4. Since the side panels 4 and the cylinder 2 are movably connected, the cylinder 2 is also supported by the fixed brackets 2 and installed on the vibration table 1. Therefore, when the vibration table 1 is running, the iron sand 8 inside the cylinder 2 will be vibrated.

[0028] A recovery box 6 is fixedly connected to the outer side of the side plate 4, the cable 5 passes through the recovery box 6, and a box cover 7 is inserted at the bottom of the recovery box 6. The cable 5 passes through two side plates 4, and each side plate 4 has an inlet and an outlet adapted to the cable 5 for convenient passage of the cable 5, and the recovery box 6 is installed on the side plate 4 at the position of the cable 5 outlet, so that the iron sand brought out of the cylinder 2 by the cable 5 or the iron sand mixed in the cracks of the outer insulation layer thereof can fall and be recovered into the recovery box 6 after being removed from the cylinder 2. The box cover 7 is plugged into the bottom of the recovery box 6 with an interference fit, and the recovery box 6 and the box cover 7 are both made of insulating material. Opening the box cover 7 can export the iron sand 8 collected and recovered in the recovery box 6.

[0029] A plugging cap 3 is threadedly connected to the top of the cylinder 2 . The plugging cap 3 is made of insulating material. After the plugging cap 3 is opened, the wasted iron sand 8 can continue to be added into the cylinder 2 .

[0030] Working principle:

[0031] When the device is in use, the vibrating table 1 vibrates the iron sand 8 inside the cylinder 2, so that when the cable 5 passes through the cylinder 2, the iron sand 8 can enter the cracks in the insulating layer of the cable 5 to form a conductor, and then the metal rod 10 and the inner core end of the cable 5 are connected through the insulation resistance tester 16 test end. If there are cracks in the insulation layer of the cable 5, resulting in insulation problems, the inner core of the cable 5, the iron sand 8 in the cracks in the insulation layer of the cable 5, the iron sand 8 in the cylinder 2 and the metal rod 10 form a loop with the insulation resistance tester 16 through the wire, so that the insulation problem on the cable 5 can be detected by the insulation resistance tester 16. The cable 5 passes through the side plate 4 and the cylinder 2 from the lower left side of the device. After the cable 5 extends to the right side of the device, it is wrapped around the guide wheel 12 and guided by the guide wheel 12 and then passes through the side plate 4 and the cylinder 2 again from right to left in the opposite direction. Since the cable 5 is guided by the guide wheel seat to return to the cylinder 2, the upper and lower relationships of its surface insulation layers are reversed. Therefore, if there are cracks in the insulation layer of the cable 5, the iron sand 8 can be filled with 5 and 6. The cable 5 penetrates into the cracks, and the cable 5 passes through the two side plates 4. Each side plate 4 has an inlet and an outlet adapted to the cable 5 for convenient passage of the cable 5. The recovery box 6 is installed on the side plate 4 at the position of the cable 5 outlet, so that the iron sand brought out of the cylinder 2 by the cable 5 or the iron sand mixed in the cracks of its outer insulating layer can fall and be recovered in the recovery box 6 after being removed from the cylinder 2. During this period, the two side plates 4 are supported and fixed on the vibration table 1 by a fixed support, and the cylinder 2 and the side plates 4 can rotate. The cylinder 2 is driven to rotate by the driving mechanism. After the reduction motor 17 is started, the cylinder 2 can be driven to rotate through the pulley 18, the belt track 19 and the belt 20. When the cylinder 2 rotates, the iron sand 8 can be driven to roll inside the cylinder 2 through the internal paddle 9, so that the iron sand 8 gradually compacted and accumulated at the bottom of the cylinder 2 due to vibration is rolled again to fall on the top of the cable 5, avoiding the problem that the iron sand 8 is over-compacted and accumulated, resulting in poor fluidity, and thus cannot penetrate into the cracks of the insulating layer of the cable 5.

Claims

1. An insulation detection device for an electrical system of a thermal power plant, comprising a vibration table (1) and a cable (5), wherein the cable (5) is located above the vibration table (1), and is characterized in that: A cylinder (2) is installed above the vibration table (1), the interior of the cylinder (2) is filled with iron sand (8), a plurality of paddles (9) are fixedly connected to the inner wall of the cylinder (2), a side plate (4) is respectively inlaid and installed on both sides of the cylinder (2), and the cylinder (2) and the side plate (4) are movably connected, the cable (5) passes through the side plate (4) and the cylinder (2), a metal rod (10) is fixedly connected between the two side plates (4), a guide wheel seat is installed on one side of the vibration table (1), a mounting platform (15) is installed in front of the vibration table (1), an insulation resistance tester (16) is fixedly installed on the top of the mounting platform (15), two test ends of the insulation resistance tester (16) are respectively electrically connected to the wiring end of the metal rod (10) and the inner core of one end of the cable (5) through wires, a driving mechanism is installed in front of the cylinder (2), and a fixed support is installed on the outer side of the side plate (4).

2. The insulation detection device for an electrical system of a thermal power plant according to claim 1, characterized in that: The driving mechanism comprises a reduction motor (17), the reduction motor (17) is fixedly mounted on the top of the mounting platform (15), the reduction motor (17) is located on one side of the insulation resistance tester (16), the output shaft of the reduction motor (17) is fixedly connected to a pulley (18), the outer end of the cylinder (2) is fixedly connected to a belt track (19), and the pulley (18) and the belt track (19) are connected to each other via a belt (20).

3. The insulation detection device for the electrical system of a thermal power plant according to claim 1, characterized in that: The guide wheel seat is composed of a fixed seat (11) and a guide wheel (12), and the guide wheel (12) is movably connected to the top of the fixed seat (11) via a rotating shaft.

4. The insulation detection device for an electrical system of a thermal power plant according to claim 1, characterized in that: The fixed support is composed of a base (14) and four brackets (13); the base (14) is fixedly connected to the top of the vibration table (1); the four brackets (13) are respectively fixedly connected to the outsides of the two side panels (4); and the brackets (13) are fixedly connected to the top of the base (14).

5. The insulation detection device for an electrical system of a thermal power plant according to claim 1, characterized in that: A recovery box (6) is fixedly connected to the outside of the side plate (4), the cable (5) passes through the recovery box (6), and a box cover (7) is inserted into the bottom of the recovery box (6).

6. The insulation detection device for an electrical system of a thermal power plant according to claim 1, characterized in that: The top of the cylinder (2) is connected with a plug cap (3) via threads.

Images