Iron tower grounding resistance automatic detection auxiliary mechanism based on electromagnetic control

Abstract

The invention discloses an iron tower grounding resistance automatic detection auxiliary mechanism based on electromagnetic control, which belongs to a grounding resistance detection device in the technical field of overhead transmission line equipment, and adopts the technical scheme that an iron tower foot cement pier is fixedly arranged on the ground of an iron tower and is used for supporting the iron tower; the iron tower foot angle steel is located at the bottom of the iron tower and fixedly connected with the iron tower foot cement pier. The grounding resistance detector is electrically connected with an iron tower foot downlead electrically connected with the iron tower foot angle steel, the grounding resistance detector is provided with an E-pole grounding wire, a P-pole grounding wire and a C-pole grounding wire, and the E-pole grounding wire, the P-pole grounding wire and the C-pole grounding wire are fixedly arranged on the iron tower ground; the invention provides an iron tower grounding resistance automatic detection auxiliary mechanism based on electromagnetic control, which can automatically monitor the numerical value of the grounding resistance of a grounding grid in real time and accurately judge a fault point.

Description

Technical Field

[0001] The invention belongs to the technical field of overhead power transmission line equipment, and in particular relates to an automatic detection auxiliary mechanism for the grounding resistance of an iron tower based on electromagnetic control. Background Art

[0002] During the operation of overhead transmission lines, lightning accidents caused by poor tower grounding account for a high proportion of line failure rate. This is mainly due to the fact that when lightning strikes the top of the pole or the ground wire (lightning arrester), the lightning current flows into the ground through the tower grounding device. Due to the high grounding resistance, a high counter-voltage is generated. The tower grounding of transmission lines is one of the main measures for line lightning protection, and its reliability is of great significance to ensure the safe and stable operation of the power system.

[0003] The tower grounding resistance is an important data. Reducing the tower grounding resistance of the transmission line can improve the lightning resistance level of the line, reduce lightning accidents, reduce the contact voltage and step voltage near the tower, and prevent accidents of electric shock to people and animals. Therefore, the monitoring of the grounding resistance of the high-voltage transmission line tower becomes particularly important. The FH-900C high-voltage transmission line tower grounding resistance online monitoring system independently developed and produced by our company can realize the real-time monitoring of the grounding resistance of the high-voltage transmission tower through the analysis of the tower grounding resistance and wireless communication technology, and send the warning / warning information to the monitoring center in time through the GSM / CDMA / GPRS / 4G network, reminding the person in charge of the line operation to pay attention to the line operation status and take corresponding disposal measures.

[0004] When the grounding device data of the tower grounding grid cannot be obtained in time, the following consequences may occur: The grounding grid status is unknown: The tower grounding system is the discharge channel for lightning protection grounding, electrostatic grounding, and protective grounding. When the tower grounding grid is destroyed, corroded, damaged, disconnected, etc., the resistance value increases, which will affect the discharge of lightning and cause ground potential counterattack, forming secondary disasters. Grounding abnormalities cannot be responded to in time: When the grounding system is abnormal (for example, the resistance value is too high or the grounding grid is rusted, detached, or dug underground), because the real-time resistance value status cannot be grasped in time, timely replacement, maintenance, etc. cannot be responded to in time, resulting in unnecessary losses. No data can be checked when an accident occurs: When a lightning strike occurs, because there is no real-time data or data storage of grounding resistance, when some comprehensive events occur, data support cannot be provided, resulting in blindness and inability to trace the source of event analysis and safety decisions. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic detection auxiliary mechanism for the grounding resistance of an iron tower based on electromagnetic control, which can monitor the grounding resistance value of the grounding grid in real time, and can automatically monitor the value of the grounding resistance of the grounding grid in real time. When the grounding resistance value of the measured circuit is abnormal or fails, the system can respond in time to provide an alarm signal, accurately determine the fault point, notify and deal with the safety hazards in time, and ensure the normal operation of the lightning protection grounding circuit.

[0006] The object of the present invention is achieved by providing an automatic detection auxiliary mechanism for the grounding resistance of an iron tower based on electromagnetic control, comprising:

[0007] The cement piers of the iron tower foot are fixedly arranged on the ground of the iron tower and used for supporting the iron tower;

[0008] Angle steel for the foot of the iron tower, the angle steel for the foot of the iron tower is located at the bottom of the iron tower, and the angle steel for the foot of the iron tower is fixedly connected to the cement pier of the foot of the iron tower; and

[0009] A grounding resistance detector, wherein the grounding resistance detector is electrically connected to the tower foot down lead electrically connected to the tower foot angle steel, and the grounding resistance detector is provided with an E-pole grounding wire, a P-pole grounding wire and a C-pole grounding wire, and the E-pole grounding wire, the P-pole grounding wire and the C-pole grounding wire are fixedly arranged on the ground of the tower.

[0010] Furthermore, a tower ground grid is arranged in the ground of the tower, and the tower ground grid is electrically connected to the ground resistance detector.

[0011] Furthermore, the E-pole grounding wire is electrically connected to the tower grounding grid.

[0012] Furthermore, an electromagnetic magnetic rod assembly is provided in the grounding resistance detector, and the electromagnetic magnetic rod assembly is used to control the passage and disconnection between the grounding resistance detector and the E-pole grounding wire.

[0013] Furthermore, the electromagnetic magnetic rod assembly includes a coil group and a magnetic rod group arranged in the ground resistance detector, the magnetic rod group includes a connector electrically connected to the ground resistance detector, a magnet rod telescopically connected to the connector, and a conductive head arranged at the end of the magnet rod, the conductive head is arranged directly above the electrically connected wire head inside the ground resistance detector, and the conductive head is connected to the connector through a wire.

[0014] Furthermore, the ground resistance detector is internally provided with a power supply, and the current of the power supply is I=10mA, 120Hz.

[0015] Furthermore, the power supply is provided with a battery, a solar panel and a solar controller, and the solar panel is fixedly arranged directly above the ground resistance detector.

[0016] Furthermore, the ground resistance detector is provided with a data module and a signal antenna, and the signal antenna is communicatively connected to a server.

[0017] Furthermore, the measuring range of the tower grounding resistance is 0.01Ω~20Ω.

[0018] Furthermore, the communication interface of the ground resistance detector is RS-485 communication mode.

[0019] The beneficial effects of the present invention are embodied in:

[0020] 1. In the present invention, a grounding resistance detector is set at the position of the iron tower foot angle steel of the iron tower fixedly installed on the cement pier of the iron tower foot to detect the resistance of the grounding wire, so as to realize real-time monitoring of the grounding resistance value of the grounding grid, implement monitoring of the whole life cycle of the grounding grid, and focus on timely discovering the change trend of the grounding resistance value of the grounding grid, continuously monitor and discover the safety hazards of the grounding grid, and provide data support for early response measures and maintenance measures. More specifically, by adopting the rated current pole changing method, that is, inputting a flowing AC rated current I (10mA, 120Hz) between the measuring objects E (grounding electrode) and C (current electrode); obtaining the potential difference V between E and P (voltage electrode), and then obtaining the grounding resistance Rx; since the grounding resistance detector is set, the circuit in the grounding resistance detector can realize automatic measurement of the grounding resistance Rx by controlling the passage and short circuit.

[0021] 2. In the present invention, the tower grounding network can conduct lightning, static electricity and other currents into the earth, protect the equipment from damage, and ensure the stable operation of the communication equipment. The tower grounding network can conduct lightning, static electricity and other currents into the earth, avoid the current flowing through the human body, and ensure the personal safety of the staff. It can improve the protection level of the communication equipment and protect the communication equipment from external interference and damage. At the same time, by setting the E-pole grounding wire to be electrically connected to the tower grounding network, a measurement point for detecting the grounding resistance is provided.

[0022] 3. In the present invention, an electromagnetic magnetic rod assembly is provided in the ground resistance detector to control the power on or off inside the ground resistance detector. More specifically, the electromagnetic magnetic rod assembly is provided at the connection between the E-pole grounding wire and the ground resistance detector, which also realizes the control of the passage and disconnection of the E-pole grounding wire.

[0023] 4. In the present invention, by arranging a coil group and a magnetic rod group in the electromagnetic magnetic rod assembly, and by energizing the coil group, the magnetic rod group in the coil group can be lifted or deflected, thereby realizing automatic control of the electrical connection inside the ground resistance detector. More specifically, since a connector electrically connected to the inside of the ground resistance detector is arranged in the magnetic rod group, and a magnet rod with a movable telescopic connection is arranged at the position of the connector, and a conductive head is arranged at the end of the magnet rod, and the conductive head is connected to the connector through a wire, when the coil is energized, the conductive head is brought into contact with or away from the electrically connected wire head arranged inside the ground resistance detector, thereby realizing control of circuit breaking and passage of the internal circuit of the ground resistance detector.

[0024] 5. In the present invention, a battery is provided in the power supply of the ground resistance detector, and a solar panel and a solar controller are electrically connected to the battery, thereby realizing power supply for the ground resistance detector, and solving the problem of inconvenient charging in the wild.

[0025] 6. In the present invention, after the device is arranged, the value of the grounding resistance of the grounding grid can be automatically monitored in real time, and an alarm function is provided when abnormal grounding resistance is found. The changing trend of the grounding resistance value can be found, especially before and after the thunderstorm season, and the real situation of the grounding resistance value of the grounding grid can be found in time. When a grounding down conductor is corroded or broken, etc., which are potential safety hazards, the location can be accurately determined, and remote access control can be performed to obtain test results and system status at any time, and necessary adjustments can be made. For lines in areas with geological disasters, harsh environments, industrial and mining working environments, acid-base-salt corrosion environments, dense passages, and areas with high incidence of lightning and other areas, the changing trend of the grounding resistance value of the grounding grid can be found in time. If the grounding grid is found to be unreasonable through continuous monitoring, countermeasures and maintenance can be taken as soon as possible to prevent accidents of injury to people and animals caused by unqualified grounding resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0027] Figure 1 It is a schematic diagram of the overall structure of the mechanism of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the electromagnetic magnetic rod assembly of the present invention.

[0029] In the attached drawing, 1-cement pier of iron tower foot, 2-iron tower ground, 3-iron tower foot angle steel, 4-ground resistance detector, 5-iron tower foot down lead, 6-E pole grounding wire, 7-P pole grounding wire, 8-C pole grounding wire, 9-iron tower ground grid, 10-electromagnetic magnetic rod assembly, 11-coil group, 12-magnetic rod group, 13-connector, 14-magnet rod, 15-conductive head, 16-wire head, 17-battery, 18-solar panel, 19-signal antenna. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0031] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0032] Reference Figure 1 and Figure 2 , an automatic detection auxiliary mechanism for tower grounding resistance based on electromagnetic control, comprising:

[0033] The tower foot cement pier 1 is fixedly arranged on the tower ground 2 and used for supporting the tower;

[0034] Angle steel 3 for the foot of the iron tower, the angle steel 3 for the foot of the iron tower is located at the bottom of the iron tower, and the angle steel 3 for the foot of the iron tower is fixedly connected to the cement pier 1 for the foot of the iron tower; and

[0035] A grounding resistance detector 4 is electrically connected to the tower foot down lead 5 electrically connected to the tower foot angle steel 3. The grounding resistance detector 4 is provided with an E-pole grounding wire 6, a P-pole grounding wire 7 and a C-pole grounding wire 8. The E-pole grounding wire 6, the P-pole grounding wire 7 and the C-pole grounding wire 8 are fixedly arranged on the tower ground 2.

[0036] By setting a grounding resistance detector 4 at the position of the tower foot angle steel 3 of the tower fixedly installed on the tower foot cement pier 1 to detect the resistance of the grounding wire, real-time monitoring of the grounding resistance value of the grounding grid is realized, and the whole life cycle of the grounding grid is monitored. The changing trend of the grounding resistance value of the grounding grid can be discovered in time, and the safety hazards of the grounding grid can be discovered through continuous monitoring, so as to provide data support for early response measures and maintenance measures. More specifically, by adopting the rated current pole-changing method, that is, inputting a flowing AC rated current I (10mA, 120Hz) between the measuring objects E (grounding electrode) and C (current electrode); obtaining the potential difference V between E and P (voltage electrode), and then obtaining the grounding resistance Rx; since the grounding resistance detector 4 is set, the circuit in the grounding resistance detector 4 can realize automatic measurement of the grounding resistance Rx through the control of the passage and short circuit.

[0037] Preferably, a tower grounding grid 9 is provided in the tower ground 2 , and the tower grounding grid 9 is electrically connected to the ground resistance detector 4 .

[0038] Preferably, the E-pole grounding wire 6 is electrically connected to the tower grounding grid 9 .

[0039] It can be understood that the tower grounding network 9 can conduct lightning, static electricity and other currents into the earth, protect the equipment from damage, and ensure the stable operation of the communication equipment. The tower grounding network 9 can conduct lightning, static electricity and other currents into the earth, avoid the current flowing through the human body, and ensure the personal safety of the staff. It can improve the protection level of the communication equipment and protect the communication equipment from external interference and damage. At the same time, by setting the E-pole grounding wire 6 to be electrically connected to the tower grounding network 9, a measurement point for detecting the grounding resistance is provided.

[0040] Preferably, an electromagnetic magnetic rod assembly 10 is provided in the ground resistance detector 4 , and the electromagnetic magnetic rod assembly 10 is used to control the passage and disconnection between the ground resistance detector 4 and the E-pole grounding wire 6 .

[0041] By providing an electromagnetic magnetic rod assembly 10 in the ground resistance detector 4, the power on or off inside the ground resistance detector 4 can be controlled. More specifically, the electromagnetic magnetic rod assembly 10 is provided at the connection between the E-pole grounding wire 6 and the ground resistance detector 4, which also realizes the control of the passage and disconnection of the E-pole grounding wire 6.

[0042] Preferably, the electromagnetic magnetic rod assembly 10 includes a coil group 11 and a magnetic rod group 12 arranged in the ground resistance detector 4, the magnetic rod group 12 includes a connector 13 electrically connected to the ground resistance detector 4, a magnet rod 14 telescopically connected to the connector 13, and a conductive head 15 arranged at the end of the magnet rod 14, the conductive head 15 is arranged directly above a wire head 16 electrically connected to the inside of the ground resistance detector 4, and the conductive head 15 is connected to the connector 13 through a wire.

[0043] Reference Figure 2 By setting a coil group 11 and a magnetic rod group 12 in the electromagnetic magnetic rod assembly 10, and by energizing the coil group 11, the magnetic rod group 12 in the coil group 11 can be lifted or deflected, thereby realizing automatic control of the electrical connection inside the ground resistance detector 4. More specifically, since a connector 13 electrically connected to the inside of the ground resistance detector 4 is set in the magnetic rod group 12, and a magnetic rod 14 with a movable telescopic connection is set at the position of the connector 13; at the same time, a conductive head 15 is set at the end of the magnetic rod 14, and the conductive head 15 is connected to the connector 13 through a wire; therefore, when the coil is energized, the conductive head 15 is brought into contact with or away from the electrically connected wire head 16 set inside the ground resistance detector 4, thereby realizing the control of the circuit breaking and passage of the internal circuit of the ground resistance detector 4.

[0044] Preferably, the ground resistance detector 4 is internally provided with a power supply, and the current of the power supply is I=10mA, 120Hz.

[0045] Preferably, the power supply is provided with a battery 17 , a solar panel 18 and a solar controller, and the solar panel 18 is fixedly arranged directly above the ground resistance detector 4 .

[0046] By providing a battery 17 as the power supply in the ground resistance detector 4, and electrically connecting a solar panel 18 and a solar controller in the battery 17, the ground resistance detector 4 can be powered and used, thereby solving the problem of inconvenient charging in the wild.

[0047] Preferably, the ground resistance detector 4 is provided with a data module and a signal antenna 19, and the signal antenna 19 is communicatively connected to a server.

[0048] Preferably, the measuring range of the tower grounding resistance is 0.01Ω~20Ω.

[0049] Preferably, the communication interface of the ground resistance detector 4 is RS-485 communication mode.

[0050] As a preferred method of this embodiment, precise three-wire measurement is adopted, measuring method: rated current pole changing method, measuring current 10mA, 120Hz; power supply mode: 12VDC, working temperature: -10℃~60℃; below 80%rh, protection level: IP65, Modbus RTU communication protocol is adopted, insulation resistance: above 10MΩ (500V between circuit and casing), electromagnetic characteristics: IEC61010-4-3, wireless frequency electromagnetic field ≤1V / m.

[0051] During use, after the device is deployed, it can automatically monitor the value of the grounding resistance of the grounding grid in real time, find abnormal grounding resistance, and have an alarm prompt function. The changing trend of the grounding resistance value can be found, especially before and after the thunderstorm season, and the true situation of the grounding resistance value of the grounding grid can be found in time. When a grounding down conductor has safety hazards such as corrosion or breakage, the location can be accurately determined, and remote access control can be performed to obtain test results and system status at any time, and make necessary adjustments. For lines in areas with geological disasters, harsh environments, industrial and mining working environments, acid-base-salt corrosion environments, dense passages, and areas with high incidence of lightning and flashes, the changing trend of the grounding resistance value of the grounding grid can be focused on and found in time. If the grounding grid is found to be unreasonable through continuous monitoring, countermeasures and maintenance can be taken as soon as possible to prevent accidents of human and animal injury caused by unqualified grounding resistance.

[0052] Working principle and working process of the present invention:

[0053] The electromagnetically controlled iron tower grounding resistance automatic detection auxiliary mechanism provided by the present invention detects the resistance of the grounding wire by setting a grounding resistance detector 4 at the position of the iron tower foot angle steel 3 of the iron tower fixedly installed on the iron tower foot cement pier 1, thereby realizing real-time monitoring of the grounding resistance value of the grounding grid, and monitoring the entire life cycle of the grounding grid. The changing trend of the grounding resistance value of the grounding grid can be discovered in a timely manner, and the safety hazards of the grounding grid can be discovered through continuous monitoring, so as to provide data support for early response measures and maintenance measures. More specifically, the rated current pole changing method is adopted, that is, a flowing AC rated current I (10mA, 120Hz) is input between the measurement objects E (grounding electrode) and C (current electrode); the potential difference V between E and P (voltage electrode) is obtained, and then the grounding resistance Rx is obtained; since the grounding resistance detector 4 is set, the circuit in the grounding resistance detector 4 can realize automatic measurement of the grounding resistance Rx through the control of the passage and short circuit.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. An automatic detection auxiliary mechanism for tower grounding resistance based on electromagnetic control, characterized in that: include: A tower foot cement pier (1), wherein the tower foot cement pier (1) is fixedly arranged on the tower ground (2) and is used to support the tower; An iron tower foot angle steel (3), the iron tower foot angle steel (3) is located at the bottom of the iron tower, and the iron tower foot angle steel (3) is fixedly connected to the iron tower foot cement pier (1); as well as A grounding resistance detector (4), the grounding resistance detector (4) being electrically connected to a tower foot down lead (5) electrically connected to the tower foot angle steel (3), the grounding resistance detector (4) being provided with an E-pole grounding wire (6), a P-pole grounding wire (7) and a C-pole grounding wire (8), the E-pole grounding wire (6), the P-pole grounding wire (7) and the C-pole grounding wire (8) being fixedly arranged on the tower ground (2).

2. The automatic detection auxiliary mechanism for tower grounding resistance based on electromagnetic control according to claim 1 is characterized in that: An iron tower grounding grid (9) is arranged in the iron tower ground (2), and the iron tower grounding grid (9) is electrically connected to the grounding resistance detector (4).

3. The automatic detection auxiliary mechanism for tower grounding resistance based on electromagnetic control according to claim 2 is characterized in that: The E-pole grounding wire (6) is electrically connected to the iron tower grounding grid (9).

4. The automatic detection auxiliary mechanism for tower grounding resistance based on electromagnetic control according to claim 3 is characterized in that: An electromagnetic magnetic rod assembly (10) is arranged inside the grounding resistance detector (4), and the electromagnetic magnetic rod assembly (10) is used to control the connection and disconnection between the grounding resistance detector (4) and the E-pole grounding wire (6).

5. The automatic detection auxiliary mechanism for tower grounding resistance based on electromagnetic control according to claim 4 is characterized in that: The electromagnetic magnetic rod assembly (10) comprises a coil group (11) and a magnetic rod group (12) arranged in the ground resistance detector (4); the magnetic rod group (12) comprises a connector (13) electrically connected to the ground resistance detector (4), a magnetic rod (14) telescopically connected to the connector (13), and a conductive head (15) arranged at the end of the magnetic rod (14); the conductive head (15) is arranged directly above a wire head (16) electrically connected inside the ground resistance detector (4); and the conductive head (15) is connected to the connector (13) via a wire.

6. The automatic detection auxiliary mechanism for tower grounding resistance based on electromagnetic control according to claim 1 is characterized in that: The ground resistance detector (4) is internally provided with a power supply, and the current of the power supply is I=10mA, 120Hz.

7. The automatic detection auxiliary mechanism for tower grounding resistance based on electromagnetic control according to claim 6 is characterized in that: The power supply is provided with a storage battery (17), a solar panel (18) and a solar controller, and the solar panel (18) is fixedly arranged directly above the ground resistance detector (4).

8. The automatic detection auxiliary mechanism for tower grounding resistance based on electromagnetic control according to claim 7 is characterized in that: The ground resistance detector (4) is provided with a data module and a signal antenna (19), and the signal antenna (19) is communicatively connected to a server.

9. The automatic detection auxiliary mechanism for tower grounding resistance based on electromagnetic control according to claim 1 is characterized in that: The measuring range of the tower grounding resistance is 0.01Ω~20Ω.

10. The automatic detection auxiliary mechanism for tower grounding resistance based on electromagnetic control according to claim 8, characterized in that: The communication interface of the ground resistance detector (4) is an RS-485 communication mode.

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