CN115825810B

CN115825810B - Low-current ground fault detection device for power system

Info

Publication number: CN115825810B
Application number: CN202310159697.6A
Authority: CN
Inventors: 于笑辰; 高靖尧; 孙艳民; 周润兴; 董鑫; 霍红; 葛雷; 白汝欣; 都基宽; 荣华; 罗孝楚
Original assignee: State Grid Liaoning Electric Power Co Ltd
Current assignee: State Grid Liaoning Electric Power Co Ltd
Priority date: 2023-02-24
Filing date: 2023-02-24
Publication date: 2023-04-18
Anticipated expiration: 2043-02-24
Also published as: CN115825810A

Abstract

The invention discloses a small current ground fault detection device for a power system, which comprises a plate body, wherein the upper side and the lower side of the plate body are respectively provided with a slide rail and a connecting plate, the slide rail is provided with a plurality of slide seats, a telescopic transmission shaft is arranged between every two adjacent slide seats, the middle parts of the slide seats are provided with connecting seats, and the top ends of the slide seats and the end parts of the connecting seats are respectively provided with a rotating wheel. According to the device, the plate body and the connecting plate are arranged, the sliding rail and the sliding seat are arranged on the plate body, the rotating wheel and the connecting seat are arranged on the sliding seat, the driving mechanism is arranged on the connecting plate and provided with the first driving piece, the rotating assembly and the transmission assembly, the driving mechanism can drive the rotating wheel on the sliding seat to rotate, the rotating wheel rolls along the overhead line wheel, the device can automatically move along a line, and compared with a mode of manually taking and pushing the hanging rod, the device is labor-saving and convenient to operate, and the detection speed and efficiency are improved.

Description

Low-current ground fault detection device for power system

Technical Field

The invention relates to the technical field of power system fault detection, in particular to a low-current ground fault detection device for a power system.

Background

The small current grounding system is a three-phase system with a neutral point not grounded or grounded through an arc suppression coil and high impedance, and is also called a neutral point indirect grounding system. When a ground fault occurs to a certain phase, the current of the ground fault is often much smaller than that of a load current due to the fact that a short circuit cannot be formed, so that the system is called as a small-current grounding system, a single-phase grounding fault in the small-current grounding system is a common temporary fault, when the fault occurs, the current of a fault point is small, line voltages between three phases are still symmetrical, and the line voltages have no influence on power supply of load equipment, so that the equipment in the system is allowed to run for a short time, and can run for 1-2 hours without tripping under the common condition, and therefore the reliability of the power supply is improved. However, grounding of one phase causes the voltage to ground of the other two phases to rise by several times the phase voltage, which threatens the insulation of the equipment, and if the voltage is not timely processed, the voltage may be developed into insulation damage, two-phase short circuit, and arc discharge, which causes system overvoltage. However, when a single-phase ground fault occurs in the system, since a loop is not formed, the ground current is distributed capacitance current, the value is much smaller than the load current, and the fault characteristics are not obvious, the ground fault detection is still a world problem, and a plurality of technologies need to be overcome.

The existing detection device for detecting the small current ground fault generally comprises a transmitter, a sensor, a receiver and accessories, wherein after a fault line is stopped, the transmitter applies an ultralow frequency high voltage signal to the line to reproduce the fault, the sensor transmits data to the receiver on the ground in a wireless mode, and the receiver displays a measurement result, so that a fault point is detected. For the overhead line, need remove the sensor when detecting and make it remove along the overhead line, use the peg to promote by the operator usually, sensor switching circuit simultaneously needs the carrier to lift the operator to the high altitude in, so current detection device's sensor is comparatively consuming time hard when using, and has the potential safety hazard.

Disclosure of Invention

The invention aims to: in order to solve the problems, a small current ground fault detection device for an electric power system is provided.

In order to achieve the purpose, the invention adopts the following technical scheme:

a small current ground fault detection device of a power system comprises a plate body, wherein a slide rail and a connecting plate are respectively arranged on the upper side and the lower side of the plate body, a plurality of slide seats are arranged on the slide rail, a telescopic transmission shaft is arranged between every two adjacent slide seats, a connecting seat is arranged in the middle of each slide seat, rotating wheels are arranged at the top ends of the slide seats and the end portion of each connecting seat, a driving mechanism, a storage battery and a PLC (programmable logic controller) are arranged on the connecting plate, and a pushing mechanism is arranged on the side surface of the plate body; the driving mechanism is used for driving the rotating wheel to rotate and comprises a first driving piece, a plurality of rotating assemblies and transmission assemblies, and a transmission rod is arranged between every two adjacent rotating assemblies; the rotating assembly comprises a connecting block, a plurality of connecting rods are arranged on the periphery of the connecting block, and the end part of the transmission rod is rotatably connected with one end, far away from the connecting block, of each connecting rod; the transmission assembly comprises a telescopic piece, a worm is arranged at the telescopic end of the telescopic piece, a worm wheel is arranged at the top end of the sliding seat, the rotating wheel and the worm wheel are coaxially arranged, a ring-shaped piece is sleeved outside the telescopic end of the telescopic piece, an installation rod is arranged outside the ring-shaped piece, and a sensor is arranged at one end, away from the ring-shaped piece, of the installation rod; the advancing mechanism is used for driving the extensible member to move along the length direction of the plate body, and comprises a shell, the two ends of the shell are respectively provided with a second driving piece and a first balancing weight, the inside of the shell is provided with two screws, two the same end of each screw is respectively provided with a gear, and one the output fixed connection of each screw and the second driving piece is two the screw is provided with a driving seat and two the driving seat is respectively provided with a second balancing weight and a guide seat, the driving seat is in sliding fit with the shell and moves along the length direction of the screws.

Preferably, the slide is provided with threely, be provided with positioning bolt on the slide, the periphery of runner is provided with annular recess, telescopic transmission shaft's both ends respectively with adjacent two runner and worm wheel fixed connection on the slide to runner, telescopic transmission shaft and the coaxial setting of worm wheel.

Preferably, battery and PLC controller set up the both sides at first driving piece respectively, the output and the connecting block fixed connection of first driving piece, rotating assembly is provided with threely, the connecting rod is provided with threely, and is three the connecting rod evenly sets up around the connecting block annular, keeps away from first driving piece the connecting block sets up with the extensible member is coaxial to the two fixed connection, extensible member and the coaxial setting of worm to the flexible end and the worm fixed connection of extensible member, the annular member rotates with the extensible member and is connected.

Preferably, the shell is of a strip-shaped structure and is arranged along the length direction of the plate body, the plate body is fixedly connected with the shell, through grooves are respectively formed in the upper side and the lower side of the shell, the through grooves are arranged along the length direction of the lead screw, the driving seat penetrates through the through grooves and is in sliding contact with the inner walls of the through grooves, and the driving seat is fixedly connected with the guide seat.

Preferably, the side of plate body is provided with the guide way, the guide way sets up along the length direction of lead screw, guide holder and guide way sliding connection, the extensible member runs through the guide holder to the extensible member rotates with the guide holder and is connected.

Preferably, first driving piece, battery, second driving piece, extensible member and sensor all with PLC controller electric connection, be provided with wireless transmission module on the PLC controller.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. this application is through setting up plate body and connecting plate, slide rail and slide have been set up on the plate body, runner and connecting seat have been set up on the slide, actuating mechanism has set up first driving piece on the connecting plate, rotating assembly and drive assembly, actuating mechanism can drive the runner rotation on the slide, and then make the runner roll along overhead line wheel, make the device can remove along the circuit by oneself, compare with the artifical mode of taking the peg and pass, the laborsaving convenient of operation of this device, and help improving the speed and the efficiency that detect.

2. This application is through setting up advancing mechanism on the plate body, advancing mechanism has set up the second driving piece, the lead screw, drive the seat, first balancing weight and second balancing weight, the setting up of two balancing weights is used for balanced detection advancing mechanism's focus, make whole detection device hang steadily and establish on the overhead line, the second driving piece can drive the lead screw rotation, make the length direction who drives the seat along the lead screw remove, and then make actuating mechanism can drive the runner rotation of different positions, the while removes the sensor, realize the switching of detection circuitry, this device need not manual operation, can improve the security of testing process.

Drawings

Fig. 1 is a schematic diagram illustrating a hanging structure of a detection device and an overhead line provided by an embodiment of the invention;

FIG. 2 is a schematic diagram illustrating a first perspective structure of a detection apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a second perspective structure of a detection apparatus according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a driving mechanism provided according to an embodiment of the present invention;

FIG. 5 illustrates a schematic diagram of a pusher jack mechanism provided in accordance with an embodiment of the present invention;

fig. 6 shows a schematic structural diagram of a screw and a driving seat provided according to an embodiment of the invention.

Illustration of the drawings:

1. a plate body; 2. a slide rail; 3. a slide base; 4. a connecting seat; 5. a rotating wheel; 6. a telescopic transmission shaft; 7. a connecting plate; 8. a first driving member; 9. connecting blocks; 10. a connecting rod; 11. a transmission rod; 12. a telescoping member; 13. a worm gear; 14. a worm; 15. a storage battery; 16. a housing; 17. a second driving member; 18. a first counterweight block; 19. a lead screw; 20. a gear; 21. a driving seat; 22. a second counterweight block; 23. a guide seat; 24. a guide groove; 25. mounting a rod; 26. a sensor; 27. a PLC controller.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution:

a small current ground fault detection device of a power system comprises a plate body 1, wherein a slide rail 2 and a connecting plate 7 are respectively arranged on the upper side and the lower side of the plate body 1, a plurality of slide seats 3 are arranged on the slide rail 2, a telescopic transmission shaft 6 is arranged between every two adjacent slide seats 3, a connecting seat 4 is arranged in the middle of each slide seat 3, rotating wheels 5 are arranged at the top ends of the slide seats 3 and the end portion of each connecting seat 4, a driving mechanism, a storage battery 15 and a PLC (programmable logic controller) 27 are arranged on the connecting plate 7, and a pushing mechanism is arranged on the side surface of the plate body 1; the driving mechanism is used for driving the rotating wheel 5 to rotate and comprises a first driving piece 8, a plurality of rotating assemblies and transmission assemblies, and a transmission rod 11 is arranged between every two adjacent rotating assemblies; the rotating assembly comprises a connecting block 9, a plurality of connecting rods 10 are arranged on the periphery of the connecting block 9, and the end part of the transmission rod 11 is rotatably connected with one end, far away from the connecting block 9, of each connecting rod 10; the transmission assembly comprises an extensible part 12, a telescopic end of the extensible part 12 is provided with a worm 14, the top end of the sliding seat 3 is provided with a worm wheel 13, the rotating wheel 5 and the worm wheel 13 are coaxially arranged, an annular piece is sleeved outside the extensible end of the extensible part 12, an installation rod 25 is arranged outside the annular piece, and a sensor 26 is arranged at one end, far away from the annular piece, of the installation rod 25; the pushing mechanism is used for driving the telescopic piece 12 to move along the length direction of the plate body 1, the pushing mechanism comprises a shell 16, two ends of the shell 16 are respectively provided with a second driving piece 17 and a first balancing weight 18, the inside of the shell 16 is provided with two lead screws 19, the same end of the two lead screws 19 is respectively provided with a gear 20, the output end of one lead screw 19 is fixedly connected with the output end of the second driving piece 17, the two lead screws 19 are respectively and threadedly connected with a driving seat 21, the two driving seats 21 are respectively provided with a second balancing weight 22 and a guide seat 23, the driving seat 21 is in sliding fit with the shell 16, and the pushing mechanism moves along the length direction of the lead screws 19.

Specifically, as shown in fig. 2 and 3, three sliding seats 3 are provided, and positioning bolts are provided on the sliding seats 3, and the positioning bolts screwed into the sliding seats 3 can abut against the sliding rails 2, so as to position the sliding seats 3. The periphery of runner 5 is provided with annular recess, and the recess can hold overhead line to the cross-section of recess is the V-arrangement structure, makes overhead line can block in the recess, and connecting seat 4 passes through the bolt to be connected with slide 3, and is provided with a plurality of screw assembly holes on the slide 3, through the mounted position who adjusts connecting seat 4, adjusts the interval of two runners 5, so runner 5 can cooperate with the overhead line of different thicknesses. The two ends of the telescopic transmission shaft 6 are respectively and fixedly connected with the rotating wheels 5 and the worm gears 13 on the two adjacent sliding seats 3, and the rotating wheels 5, the telescopic transmission shaft 6 and the worm gears 13 are coaxially arranged. The telescopic drive shafts 6 serve to connect the wheels 5 on adjacent carriages 3 so that the wheels 5 on all carriages 3 of the device can rotate in synchronism, thereby allowing the device to move stably along an overhead line.

Specifically, as shown in fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the storage battery 15 and the PLC controller 27 are respectively disposed on two sides of the first driving member 8, the output end of the first driving member 8 is fixedly connected to the connecting block 9, the number of the rotating assemblies is three, the number of the connecting rods 10 is three, the three connecting rods 10 are uniformly annularly disposed around the connecting block 9, the connecting block 9 far away from the first driving member 8 is coaxially disposed with the extensible member 12, and the two are fixedly connected, the extensible member 12 is coaxially disposed with the worm 14, and the extensible end of the extensible member 12 is fixedly connected to the worm 14, and the annular member is rotatably connected to the extensible member 12. The shell 16 is a bar-shaped structure, and along the length direction setting of the plate body 1, the plate body 1 and the shell 16 are fixedly connected, the upper and lower both sides of the shell 16 are respectively provided with a through groove, the through groove is arranged along the length direction of the lead screw 19, the driving seat 21 runs through the through groove, and the driving seat 21 is in sliding contact with the inner wall of the through groove, the driving seat 21 is fixedly connected with the guide seat 23. The side of plate body 1 is provided with guide way 24, and guide way 24 sets up along the length direction of lead screw 19, and guide holder 23 and guide way 24 sliding connection, extensible member 12 run through guide holder 23 to extensible member 12 and guide holder 23 rotate and be connected.

The first driving part 8 can drive the rotating assemblies connected with the first driving part to rotate, all the rotating assemblies can be driven to synchronously rotate through the transmission rod 11, so that the telescopic part 12 is driven to spin, the worm 14 can drive the worm wheel 13 to rotate, the rotating wheel 5 is further driven to rotate, and the detection device is enabled to move along the overhead line. The second driving member 17 can drive the screw rod 19 to rotate, and the gears 20 at the end parts of the two screw rods 19 are meshed with each other, so that the two screw rods 19 can rotate in opposite directions, two driving seats 21 on the two screw rods 19 can move in opposite directions, the second balancing weight 22 and the plurality of rotating assemblies can balance the gravity center of the device, and the holding device is stable. The sensor 26 has a notch which can be inserted into the overhead line from below, and the expansion piece 12 can control the engagement and separation of the worm wheel 13 and the worm 14 and the engagement and separation of the sensor 26 and the overhead line by expansion and contraction. The second driving member 17 and the first counter weight 18 can balance the center of gravity of the pushing mechanism for keeping the device balanced.

Specifically, as shown in fig. 2, 3 and 5, the first driving member 8, the storage battery 15, the second driving member 17, the expansion member 12 and the sensor 26 are all electrically connected to a PLC controller 27, and the PLC controller 27 is provided with a wireless transmission module. The wireless transmission module can transmit signals with a receiver, and simultaneously, an operator on the ground can cooperate with the PLC 27 through the receiver to control the operation of the first driving piece 8, the second driving piece 17, the telescopic piece 12 and the sensor 26.

In summary, in the small current ground fault detection device for the power system provided by this embodiment, during detection, the first driving element 8 is started, the telescopic element 12 is driven by the rotating element and the transmission rod 11 to rotate, and the worm 14 drives the worm wheel 13 to rotate, so that the device moves along the overhead route by the rotation of the rotating wheel 5; when switching the detection line, the telescopic part 12 contracts, so that the worm 14 moves to be separated from the worm wheel 13, and the sensor 26 is far away from the overhead line, then the second driving part 17 is started to drive the lead screw 19 to rotate, so that the driving seat 21 moves along the lead screw 19, the guide seat 23 can move along the guide groove 24, after the sensor 26 moves to the lower part of the line to be detected, the second driving part 17 is closed, the telescopic part 12 stretches, so that the worm 14 is meshed with the worm wheel 13, and the sensor 26 is clamped at the outer side of the line to be detected.

The previous description of the embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The small-current ground fault detection device for the power system is characterized by comprising a plate body (1), wherein a slide rail (2) and a connecting plate (7) are respectively arranged on the upper side and the lower side of the plate body (1), a plurality of slide seats (3) are arranged on the slide rail (2), a telescopic transmission shaft (6) is arranged between every two adjacent slide seats (3), a connecting seat (4) is arranged in the middle of each slide seat (3), rotating wheels (5) are arranged at the top ends of the slide seats (3) and the end portions of the connecting seats (4), a driving mechanism, a storage battery (15) and a PLC (programmable logic controller) (27) are arranged on the connecting plate (7), and a pushing mechanism is arranged on the side surface of the plate body (1); the driving mechanism is used for driving the rotating wheel (5) to rotate and comprises a first driving piece (8), a plurality of rotating assemblies and transmission assemblies, and a transmission rod (11) is arranged between every two adjacent rotating assemblies; the rotating assembly comprises a connecting block (9), a plurality of connecting rods (10) are arranged on the periphery of the connecting block (9), and the end part of the transmission rod (11) is rotatably connected with one end, far away from the connecting block (9), of each connecting rod (10); the transmission assembly comprises a telescopic piece (12), a worm (14) is arranged at the telescopic end of the telescopic piece (12), a worm wheel (13) is arranged at the top end of the sliding seat (3), the rotating wheel (5) and the worm wheel (13) are coaxially arranged, a ring piece is sleeved outside the telescopic end of the telescopic piece (12), an installation rod (25) is arranged outside the ring piece, and a sensor (26) is arranged at one end, far away from the ring piece, of the installation rod (25); pusher jack is used for driving extensible member (12) to remove along the length direction of plate body (1), and it includes shell (16), the both ends of shell (16) are provided with second driving piece (17) and first balancing weight (18) respectively, the inside of shell (16) is provided with two lead screws (19), two the same end of lead screw (19) is provided with gear (20) respectively, one of them output fixed connection of lead screw (19) and second driving piece (17), two equal threaded connection has drive seat (21), two on lead screw (19) be provided with second balancing weight (22) and guide holder (23) on drive seat (21) respectively, drive seat (21) and shell (16) sliding fit to remove along the length direction of lead screw (19).

2. The small current ground fault detection device for the power system according to claim 1, wherein there are three sliding seats (3), positioning bolts are arranged on the sliding seats (3), an annular groove is arranged on the periphery of each rotating wheel (5), two ends of each telescopic transmission shaft (6) are respectively and fixedly connected with the rotating wheels (5) and the worm gears (13) on two adjacent sliding seats (3), and the rotating wheels (5), the telescopic transmission shafts (6) and the worm gears (13) are coaxially arranged.

3. The small-current ground fault detection device for the power system as claimed in claim 1, wherein the storage battery (15) and the PLC controller (27) are respectively disposed on two sides of the first driving member (8), the output end of the first driving member (8) is fixedly connected with the connecting block (9), the number of the rotating assemblies is three, the number of the connecting rods (10) is three, the three connecting rods (10) are uniformly disposed annularly around the connecting block (9), the connecting block (9) far away from the first driving member (8) is coaxially disposed with the telescopic member (12) and fixedly connected with the same, the telescopic member (12) is coaxially disposed with the worm (14), and the telescopic end of the telescopic member (12) is fixedly connected with the worm (14), and the annular member is rotatably connected with the telescopic member (12).

4. The small-current ground fault detection device for the power system according to claim 1, wherein the housing (16) is of a strip-shaped structure and is disposed along a length direction of a plate body (1), the plate body (1) is fixedly connected with the housing (16), a through groove is disposed on each of upper and lower sides of the housing (16) and is disposed along the length direction of the lead screw (19), the driving seat (21) penetrates through the through groove, the driving seat (21) is in sliding contact with an inner wall of the through groove, and the driving seat (21) is fixedly connected with the guide seat (23).

5. The small current ground fault detection device for the power system according to claim 1, wherein a guide groove (24) is formed in a side surface of the plate body (1), the guide groove (24) is formed along a length direction of the lead screw (19), the guide seat (23) is slidably connected with the guide groove (24), the telescopic member (12) penetrates through the guide seat (23), and the telescopic member (12) is rotatably connected with the guide seat (23).

6. The device for detecting the low-current ground fault of the power system according to claim 1, wherein the first driving member (8), the storage battery (15), the second driving member (17), the telescopic member (12) and the sensor (26) are electrically connected to a PLC controller (27), and a wireless transmission module is disposed on the PLC controller (27).