With the progress of the times, more and more people choose to relax themselves through tourism. As a result, many scenic spots are also developing with the times. Many scenic spots have sightseeing ropeways. How to design? This requires a very professional technical staff. In the next article, experts from Zhengzhou Leidi Electronic Engineering Co., Ltd. will tell you about the lightning protection design of the scenic sightseeing ropeway.
Lightning Strikes May Cause Danger to the Ropeway 1. Direct Lightning Strike Hazard Due to the large span of the cableway, the cableway, cable car, overhead power line, and various signal cable lines are barely installed. Once a direct lightning strike occurs, these installation locations can easily become the target of direct lightning strikes, posing a great threat to the normal operation of the ropeway and the personal safety of the passengers. Therefore, in the design, installation, and maintenance of cableway integrated lightning protection projects, perfect and reliable direct lightning protection must be adopted.
2. Induced lightning and lightning wave intrusion hazards There are three ways to sense the effects of lightning and lightning wave intrusion on cableways:
The various signal cables, overhead power lines, ropeway ropes and other objects that enter the station house cause lightning induced lightning strikes and lightning wave intrusion, which can lead to electrical damage to the equipment.
Since the core components of the cableway control system (such as AC/DC inverters, etc.) contain winding coils, if a lightning strike occurs near the station room, a powerful instantaneous lightning current will produce a changing electromagnetic field in the surrounding space. The momentarily changing magnetic field will be in the winding coil. Extremely high induced electromotive force is generated at both ends, thereby damaging the control equipment;
Ropeway station houses generally have a small area, and the resistivity of the soil where they are built is relatively high. It is difficult to ground various equipment, power grounding, and lightning protection grounding. If handled improperly, when a lightning strike occurs, ground potential counterattacks easily occur. . In the case of cableways, induced lightning strikes generally only damage their electrical control systems and do not cause personal injury.
Precautions against direct lightning strikes 1. The station for preventing direct lightning strikes on the upper and lower station buildings is located at the commanding height of the entire ropeway equipment system. It is built near the top of the mountain and is most vulnerable to direct lightning strikes. In order to reduce or avoid direct lightning strikes on the station building, first, the upper station building should be grounded for lightning protection. The lightning protection network should be located at a place where the height of the roof surface of the station is certain. The lightning protection network should pass through the station building. The earthing lead reserved for construction shall be connected with the grounding pole around the station building. If the roof of the cableway station house is a metal roof, the metal roof can be used as a lightning receptor, and the entire roof metal plate can be reliably connected with the grounding grid. To make a reliable connection, it is recommended to use lightning rods, independent lightning rods, and lightning protection needles for protection.
2. Prevention of direct lightning strikes on power lines For overhead power lines from the next station to the upper station's opening and closing station (for converting a 10 kV high voltage to a 380 V voltage room), a lightning conductor should be used for protection. The protection angle of the lightning conductor to the side conductor on the ropeway tower pole should be between 20 degrees and 30 degrees. The distance between the two lightning conductors on the tower pole should not exceed five times the vertical distance between the conductor and the lightning conductor. (3) Prevention of direct lightning strikes on cableway and signal cables. The method of preventing direct lightning strikes on cableway and signal cables is the same as the direct lightning strike prevention method for power lines. The North Wudang Mountain Ropeway and various signal lines use the steel wire rope erected on the top of the ropeway support as a lightning receptor to protect it from direct lightning strikes.
(I) Lightning Protection of Cable Cars To effectively prevent direct damage from lightning damage to cable stations at the foot of the cableway, a pilot discharge lightning rod should be installed at the top of the steel roof at the top of the station.
Located between the upper station and the lower station of the ropeway, the top of the cable car is a lightning protection line.
(II) Lightning Protection for Communication Cables and Wire Ropes The communication cables used in the cableways are 48-core cables. To protect the cables and the load-bearing steel cables, we erected two lightning protection cables above them. The lightning protection cables were used in the nine supports and the station houses. Both have reliable locations within. According to the lightning protection requirements of electronic systems, we will connect the base steel bars, beam and steel bars, metal frames, and lightning protection conductors of the building to form a Faraday network with a grounding resistance of less than 1 ohm.
Precautionary Measures for Induced Lightning and Lightning Wave Invasion 1. Prevention of Power Induced Lightning and Lightning Wave Invasion Prevention of Power Induced Lightning and Intrusion of Lightning Wave Intrusion Prevention The power supply for cableway operation is from the substation switching station of the Power Supply Bureau through the next station overhead power line. Transformer transformer into the room, its high-voltage input terminal 10kV) is a long distance transmission line, the height difference between the upper and lower stations, in the direct lightning and inductive lightning susceptible to over-voltage, low-voltage end (380-220V) easy to induction The overvoltage generated by lightning-induced electromagnetic waves with a radius ranging from several hundred meters to 2000 meters, and lightning accidents of electronic equipment are mostly caused by power lines. Therefore, multi-stage power surge arrester protection should be adopted for cableway power lines. Realize the progressive discharge of lightning currents.
(1) A high-voltage arrester is installed on the high voltage side of the transformer. If the conditions permit, the overhead line is replaced with the buried cable at 50m into the front of the transformer; (2) A three-level power surge arrester is installed on the low-voltage side of the transformer for electronic equipment. Implementation of multi-stage protection, and its arrester parameters shall meet the requirements of the arrester parameters in the “Lightning Protection Design Specification for Buildings†(2010 revision), and the starting voltage, leakage current and other technical parameters of the arresters of different levels and the arrester of different grades. The distance between them should meet the energy fit.
The 40KA/380 surge protector is installed at the incoming line of the three-phase power distribution of the station on the cableway and the station, and a 20KA/220 surge protector is installed on the incoming line of the control room. Surge protector ground conductor cross-sectional area of ​​10mm2 copper insulated wire.
The measures for power supply lightning protection on the ropeway are: (1) The high-voltage arrester on the high-voltage side of the power supply is installed in place during line laying; (2) The surge arrester with a flow capacity of 50kA (10/350μs) TSPD-A350 is installed on the low-voltage side of the upper station as the first Level protection, Install 80A (8/20μs) TSPD-B+C80RM lightning arrester as the second level of protection at the main power supply of the power distribution cabinet of the station, and install a 40kA (8/20μs) flow rate at the front of the power distribution cabinet. ) The arrester of the TSP-C40RM acts as a third level of protection.
Power supply lightning protection installation:
2. There are many signal cables for the cableway for intrusion prevention of signal lines and lightning waves. According to the function, they can be mainly divided into control signal lines, broadcasting signal lines and telephone lines. The control signal line is a transmission line that monitors cableway operation and operation consoles (devices that control the cableway on/off, acceleration/deceleration, etc.) to issue instructions to the cableway control system. Once the communication is interrupted due to the intrusion of induced and thunderbolt waves, the cableway will not be able to normal operation.
Therefore, the protection of the control signal line is the key to the intrusion of the entire signal line induced lightning and lightning waves. For the prevention of the intrusion of signal lines induced by lightning and lightning, the appropriate lightning protection device can be selected according to the signal type, interface, characteristic impedance, frequency, bandwidth, insertion loss, working level and other performance indicators. The arrester should be installed in the signal line to enter the device. front end.
The lightning protection measures for cableway signal systems include installing a 24V DC lightning arrester at the front end of the control signal transmission control signal line into the device, and installing a 12V DC lightning arrester at the front of the device to monitor the derailment of the U-shaped needle signal cable to prevent lightning currents from overhead lines. Cable equipment.
Regarding the lightning protection design scheme for the scenic sightseeing ropeway, today Zhengzhou Leidi Electronic Engineering Co., Ltd. technical personnel has spoken about it here. If you need more information, please contact us.
Lightning Strikes May Cause Danger to the Ropeway 1. Direct Lightning Strike Hazard Due to the large span of the cableway, the cableway, cable car, overhead power line, and various signal cable lines are barely installed. Once a direct lightning strike occurs, these installation locations can easily become the target of direct lightning strikes, posing a great threat to the normal operation of the ropeway and the personal safety of the passengers. Therefore, in the design, installation, and maintenance of cableway integrated lightning protection projects, perfect and reliable direct lightning protection must be adopted.
2. Induced lightning and lightning wave intrusion hazards There are three ways to sense the effects of lightning and lightning wave intrusion on cableways:
The various signal cables, overhead power lines, ropeway ropes and other objects that enter the station house cause lightning induced lightning strikes and lightning wave intrusion, which can lead to electrical damage to the equipment.
Since the core components of the cableway control system (such as AC/DC inverters, etc.) contain winding coils, if a lightning strike occurs near the station room, a powerful instantaneous lightning current will produce a changing electromagnetic field in the surrounding space. The momentarily changing magnetic field will be in the winding coil. Extremely high induced electromotive force is generated at both ends, thereby damaging the control equipment;
Ropeway station houses generally have a small area, and the resistivity of the soil where they are built is relatively high. It is difficult to ground various equipment, power grounding, and lightning protection grounding. If handled improperly, when a lightning strike occurs, ground potential counterattacks easily occur. . In the case of cableways, induced lightning strikes generally only damage their electrical control systems and do not cause personal injury.
Precautions against direct lightning strikes 1. The station for preventing direct lightning strikes on the upper and lower station buildings is located at the commanding height of the entire ropeway equipment system. It is built near the top of the mountain and is most vulnerable to direct lightning strikes. In order to reduce or avoid direct lightning strikes on the station building, first, the upper station building should be grounded for lightning protection. The lightning protection network should be located at a place where the height of the roof surface of the station is certain. The lightning protection network should pass through the station building. The earthing lead reserved for construction shall be connected with the grounding pole around the station building. If the roof of the cableway station house is a metal roof, the metal roof can be used as a lightning receptor, and the entire roof metal plate can be reliably connected with the grounding grid. To make a reliable connection, it is recommended to use lightning rods, independent lightning rods, and lightning protection needles for protection.
2. Prevention of direct lightning strikes on power lines For overhead power lines from the next station to the upper station's opening and closing station (for converting a 10 kV high voltage to a 380 V voltage room), a lightning conductor should be used for protection. The protection angle of the lightning conductor to the side conductor on the ropeway tower pole should be between 20 degrees and 30 degrees. The distance between the two lightning conductors on the tower pole should not exceed five times the vertical distance between the conductor and the lightning conductor. (3) Prevention of direct lightning strikes on cableway and signal cables. The method of preventing direct lightning strikes on cableway and signal cables is the same as the direct lightning strike prevention method for power lines. The North Wudang Mountain Ropeway and various signal lines use the steel wire rope erected on the top of the ropeway support as a lightning receptor to protect it from direct lightning strikes.
(I) Lightning Protection of Cable Cars To effectively prevent direct damage from lightning damage to cable stations at the foot of the cableway, a pilot discharge lightning rod should be installed at the top of the steel roof at the top of the station.
Located between the upper station and the lower station of the ropeway, the top of the cable car is a lightning protection line.
(II) Lightning Protection for Communication Cables and Wire Ropes The communication cables used in the cableways are 48-core cables. To protect the cables and the load-bearing steel cables, we erected two lightning protection cables above them. The lightning protection cables were used in the nine supports and the station houses. Both have reliable locations within. According to the lightning protection requirements of electronic systems, we will connect the base steel bars, beam and steel bars, metal frames, and lightning protection conductors of the building to form a Faraday network with a grounding resistance of less than 1 ohm.
Precautionary Measures for Induced Lightning and Lightning Wave Invasion 1. Prevention of Power Induced Lightning and Lightning Wave Invasion Prevention of Power Induced Lightning and Intrusion of Lightning Wave Intrusion Prevention The power supply for cableway operation is from the substation switching station of the Power Supply Bureau through the next station overhead power line. Transformer transformer into the room, its high-voltage input terminal 10kV) is a long distance transmission line, the height difference between the upper and lower stations, in the direct lightning and inductive lightning susceptible to over-voltage, low-voltage end (380-220V) easy to induction The overvoltage generated by lightning-induced electromagnetic waves with a radius ranging from several hundred meters to 2000 meters, and lightning accidents of electronic equipment are mostly caused by power lines. Therefore, multi-stage power surge arrester protection should be adopted for cableway power lines. Realize the progressive discharge of lightning currents.
(1) A high-voltage arrester is installed on the high voltage side of the transformer. If the conditions permit, the overhead line is replaced with the buried cable at 50m into the front of the transformer; (2) A three-level power surge arrester is installed on the low-voltage side of the transformer for electronic equipment. Implementation of multi-stage protection, and its arrester parameters shall meet the requirements of the arrester parameters in the “Lightning Protection Design Specification for Buildings†(2010 revision), and the starting voltage, leakage current and other technical parameters of the arresters of different levels and the arrester of different grades. The distance between them should meet the energy fit.
The 40KA/380 surge protector is installed at the incoming line of the three-phase power distribution of the station on the cableway and the station, and a 20KA/220 surge protector is installed on the incoming line of the control room. Surge protector ground conductor cross-sectional area of ​​10mm2 copper insulated wire.
The measures for power supply lightning protection on the ropeway are: (1) The high-voltage arrester on the high-voltage side of the power supply is installed in place during line laying; (2) The surge arrester with a flow capacity of 50kA (10/350μs) TSPD-A350 is installed on the low-voltage side of the upper station as the first Level protection, Install 80A (8/20μs) TSPD-B+C80RM lightning arrester as the second level of protection at the main power supply of the power distribution cabinet of the station, and install a 40kA (8/20μs) flow rate at the front of the power distribution cabinet. ) The arrester of the TSP-C40RM acts as a third level of protection.
Power supply lightning protection installation:
2. There are many signal cables for the cableway for intrusion prevention of signal lines and lightning waves. According to the function, they can be mainly divided into control signal lines, broadcasting signal lines and telephone lines. The control signal line is a transmission line that monitors cableway operation and operation consoles (devices that control the cableway on/off, acceleration/deceleration, etc.) to issue instructions to the cableway control system. Once the communication is interrupted due to the intrusion of induced and thunderbolt waves, the cableway will not be able to normal operation.
Therefore, the protection of the control signal line is the key to the intrusion of the entire signal line induced lightning and lightning waves. For the prevention of the intrusion of signal lines induced by lightning and lightning, the appropriate lightning protection device can be selected according to the signal type, interface, characteristic impedance, frequency, bandwidth, insertion loss, working level and other performance indicators. The arrester should be installed in the signal line to enter the device. front end.
The lightning protection measures for cableway signal systems include installing a 24V DC lightning arrester at the front end of the control signal transmission control signal line into the device, and installing a 12V DC lightning arrester at the front of the device to monitor the derailment of the U-shaped needle signal cable to prevent lightning currents from overhead lines. Cable equipment.
Regarding the lightning protection design scheme for the scenic sightseeing ropeway, today Zhengzhou Leidi Electronic Engineering Co., Ltd. technical personnel has spoken about it here. If you need more information, please contact us.
plastic 3D printing,3d Printing Service/ 3d Oem Sla Print Model/ China Hot Sale 3d Printing Prototype Mock Up Samples.
Plastic 3D Printing,Plastic 3D Printing Model,Preform Moulds,Plastic Extrusion Moulds
Dongguan Anding Technology Manufacturing Co., Ltd , https://www.cn-moulds.com