Standard number: QX/T 499-2019
Standard name: Technical specifications
for lightning protection of road traffic electronic
monitoring systems
Standard format: PDF
Release time: 2019-09-18
Implementation time: 2019-12-01
Standard size: 1409K
Standard introduction: This standard was drafted according to the rules given in GB/T1.1-2009.
This standard is proposed by the National Lightning Disaster Prevention Industry Standardization Technical Committee and is under the jurisdiction of the drafting units of this standard: Henan Meteorological Bureau, Henan Meteorological Disaster Prevention Technology Center (Henan Lightning Protection Center), Henan Modern Lightning Protection Co.,
Ltd., Zhengzhou Xuyuan Technology Co., Ltd., Henan Electric Product Quality Supervision and Inspection Institute, Henan Luohe Public Security Bureau Traffic Police Detachment, Fujian Putian Public Security Bureau Traffic Police Detachment
The main drafters of this standard: Lin Yong, Zhang Yonggang, Li Wuqiang, Zhao Zhanyou, Li Peng, Zhang Yuhua, Fu Guoqing, Cheng Lidan, Yang Meirong, Zhang Xinling Wang Kun, Du Xiaobin, Tian Xiaoyi, Wang Lu, Liu Hexing, Feng Xinghui, Xing Yanlei, Wang Suhui, Lin Yimin, Chen Li, Wang Chi This standard specifies the general requirements for lightning protection of road traffic electronic monitoring systems, and lightning protection of computer rooms, field equipment and communication lines.
This standard applies to the lightning protection design of road traffic electronic monitoring systems.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document
. For undated references, the latest version (including all amendments) applies to this document.
GB50057—2010 Lightning protection design specification for buildings
GB50343-2012 Technical specification for lightning protection of electronic information systems in buildings
GA/T496-2014 General technical conditions for automatic recording system for running red lights
GA/T497—2016 General technical conditions for intelligent detection and recording system for road vehicles
QX/T190-2013 Lightning protection design specification for expressway facilities
This standard specifies the general requirements for lightning protection of electronic road traffic monitoring systems, and lightning protection for computer rooms, field equipment and communication lines. This standard applies to the lightning protection design of electronic road traffic monitoring systems.

ICS07.060
Meteorological Industry Standard of the People's Republic of China
QX/T499—2019
Technical specifications for lightning protection of road traffic electronic monitoring systems
Industry Standard Information Service Platform
Published on September 18, 2019
China Meteorological Administration
Implemented on December 1, 2019
Industry Standard Information Service Platform
Normative Reference Documents
Terms and Definitions
General Requirements
Lightning Protection for Machine Rooms
Lightning Protection for Tunnel Equipment
Lightning Protection for Field Equipment
Lightning Protection for Communication Systems
Appendix A (Informative Appendix)
Appendix B (Informative Appendix)
Appendix C (Informative Appendix)
References
Schematic diagram of lightning protection zone division for electronic monitoring system for road traffic Lightning protection diagram for electromechanical equipment in tunnels
Installation location of SPD for electronic capture system
QX/T499—2019
Industry standard information service platform
QX/T499—2019
This standard was drafted in accordance with the rules given in GB/T1.1—2009. This standard was proposed and managed by the National Technical Committee for Standardization of Lightning Disaster Prevention Industry. The drafting units of this standard are: Henan Meteorological Bureau, Henan Meteorological Disaster Prevention Technology Center (Henan Lightning Protection Center), Henan Modern Lightning Protection Co., Ltd., Zhengzhou Xuyuan Technology Co., Ltd., Henan Electronic Product Quality Supervision and Inspection Institute, Henan Luohe Public Security Bureau Traffic Police Detachment, Fujian Putian Public Security Bureau Traffic Police Detachment. The main drafters of this standard are: Lin Yong, Zhang Yonggang, Li Wuqiang, Zhao Zhanyou, Li Peng, Zhang Yuhua, Fu Guoqing, Cheng Lidan, Yang Meirong, Zhang Xinling, Wang Kun, Du Xiaobin, Tian Xiaoyi, Wang Lu, Liu Hexing, Feng Xinghui, Xing Yanlei, Wang Suhui, Lin Yimin, Chen Li, Wang Chi. Industry Standard Information Service Platform
1 Scope
Technical Specification for Lightning Protection of Road Traffic Electronic Monitoring System QX/T499—2019
This standard specifies the general requirements for lightning protection of road traffic electronic monitoring system, lightning protection of computer room, field equipment and communication lines. This standard applies to the lightning protection design of road traffic electronic monitoring system. 2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document GB50057—2010 Specification for Lightning Protection Design of Buildings GB50343-2012 Technical Specification for Lightning Protection of Electronic Information Systems of Buildings GA/T496—2014
General Technical Conditions for Automatic Recording System of Red Light Running GA/T497—2016
General Technical Conditions for Intelligent Detection and Recording System of Road Vehicles QX/T1902013
Specification for Lightning Protection Design of Highway Facilities
3 Terms and Definitions
The following terms and definitions apply to this document. 3.1
Road traffic electronic monitoring system
Road traffic electronic monitoring system A monitoring system consisting of a command center, a communication network and an intersection control part, including subsystems such as an automatic red light violation recording system, an intelligent highway vehicle monitoring and recording system, a traffic television monitoring system, a motor vehicle interval speed measurement system and a safety alarm device, as well as lines and field equipment.
Automatic recording and recording system for violation of traffic signal Automatic red light violation recording system
A system that can be installed at intersections and sections controlled by signals to automatically detect and record the red light violation behavior of motor vehicles in designated lanes, and is composed of a motor vehicle red light violation detection unit, an image acquisition unit, and data processing storage and application software units. [GA/T496—2014. Definition 3.2]
Earth; ground
An intentional or unintentional conductive connection that allows a circuit or electrical equipment to be connected to the earth or to a larger conductive body that replaces the earth.
Note: The purpose of grounding is: a. Make the conductor connected to the ground have a potential equal to or close to that of the earth (or a conductor that replaces the earth); b. Lead, introduce ground current into and out of the earth (or a conductor that replaces the earth). Note: Rewrite GB/T17949,1-2000.Definition 4.1. 3.4
Important computer room
importantcumputerroom
Computer room of provincial and above road network toll settlement (account splitting) center, road network monitoring center, command and dispatch center, etc. 1
QX/T499-2019
[QX/T190-2013.Definition 3.17]
Artificial earth electrode
artificialeartheelectrode
A ground electrode buried for grounding needs. Artificial ground electrodes can be divided into artificial vertical ground electrodes and artificial horizontal ground electrodes. [GB/T21431—2015. Definition 3.5]]
Common earthing system
commonearthingsystem
The grounding device of the lightning protection system, the metal components of the building, the low-voltage power distribution protection line (PE), the equipotential bonding terminal board or connection belt, the equipment protection ground, the shield grounding, the anti-static grounding, the functional grounding, etc. are connected together to form a common grounding system. [GB50343—2012, Definition 2.0.6]
Lightning equipotential bonding Lightning equipotential bonding Connect the separated metal objects directly to the lightning protection device with a connecting conductor or through a surge protector to reduce the potential difference caused by the lightning current.
[GB50057—2010.Definition 2.0.19]
Lightning electromagnetic pulse lightningelectromagneticimpulse The electromagnetic effect produced by the lightning current through the resistance, inductance and capacitance coupling, including lightning surge and radiated electromagnetic field [GB50057—2010, definition 2.0.25]
Lightning protection zone lightningprotectionzoneLPZ The zone that divides the lightning electromagnetic environment. The zone interface of a lightning protection zone does not necessarily have a physical interface, such as walls, floors or ceilings as zone interfaces.
[GB50057—2010, definition 2.0.24]
Surge protection device
surge transient device; SPD
A device used to limit transient overcurrent and discharge surge current. It contains at least one nonlinear element. [GB500572010.Baoyi 2.0.29]
outfieldequipment
Outfield equipment
Road condition monitoring equipment, meteorological monitoring equipment, variable information boards, traffic lights, speed limit signs and other information services placed above and on both sides of the square or road
Electrical and mechanical (electrical, electronic) equipment.
4 General requirements
4.1 The electronic road traffic monitoring system should divide the buildings that need to protect and control the lightning electromagnetic pulse environment into different lightning protection zones from the outside to the inside. The division of lightning protection zones refers to Appendix A. 4.2 The building where the electronic road traffic monitoring system is located should determine the lightning protection category in accordance with the provisions of GB50057-2010, and take corresponding measures such as lightning connection, shunting, shielding, isolation, lightning protection equipotential connection, common grounding and reasonable wiring for comprehensive protection. When the classification requirements of the third type of lightning protection buildings are not met, direct lightning and lightning electromagnetic pulse protection measures should be taken in accordance with the provisions of the third type of lightning protection buildings. 4.3 The design and selection of SPD for the electronic road traffic monitoring system shall comply with the provisions of Chapter 8 of QX/T190-2013. 2
5 Lightning protection for computer rooms
QX/T499—2019
5.1 The computer room should be located in the center of the lower floors of the building, and its equipment should be configured in the subsequent lightning protection zone after the LPZ1 zone, and a certain safety distance should be left from the corresponding lightning protection zone shield and structural columns. 5.2 The computer room should use metal doors and windows, and metal doors and windows and metal partitions in the computer room and other large-sized metal objects should be grounded nearby. 5.3. Metal doors should be used for important computer rooms, and metal shielding nets should be installed on windows and walls. The mesh size should not be larger than 200mm×200mm. Metal doors, windows and external wall steel mesh should be reliably electrically connected to the main structural reinforcement in the building. 5.4. Copper bars with a cross-sectional area of ​​not less than 90mm and a thickness of not less than 3mm should be set in the computer room. A ring-shaped closed grounding busbar should be set around the wall and reliably connected to the local equipotential grounding terminal board reserved in the computer room at least two places. 5.5. The metal keel on the ceiling of the computer room should be reliably electrically connected to the reserved equipotential grounding terminal board in the computer room at least two places. 5.6. A common grounding system should be used for safety protection ground, shielding ground, anti-static grounding, lightning protection grounding, etc. in the computer room. 5.7. All exposed conductive objects of the equipment should be connected to the established equipotential connection network. The equipotential connection network structure should comply with the provisions of 6.3.4 in GB50057-2010. 5.8 The power supply and signal cables of the machine room should be connected to the same potential at the entrance. The power supply cables and signal cables in the machine room should be laid in their own metal wire ducts or metal bridges respectively. The metal wire ducts and bridges should be electrically connected throughout the whole process. 5.9 An appropriate SPD should be installed at the AC power distribution box of the important machine room. Its effective protection level should be compatible with the withstand voltage level of the protected equipment.
5.10 The lightning protection of the automatic recording system for running red lights should also comply with the provisions of 4.2 and 4.4 of GA/T4962014. 5.11 The lightning protection of the intelligent monitoring and recording system for highway vehicles should also comply with the provisions of 4.2 and 4.5 of GA/T4972016. 6 Lightning protection of tunnel equipment
6.1 A set of grounding devices should be set near the tunnel entrances at both ends. They should form a joint common grounding system with the grounding body in the tunnel. The power frequency grounding resistance value should not be greater than 42. When the soil resistivity is greater than 10002·m, the resistance value can be appropriately relaxed. 6.2. At least one set of equipotential bonding strips running through the tunnel shall be set up at both ends of the tunnel, and repeated grounding should be performed every 50m. Support anchor rods can be used as connecting terminals of the equipotential bonding strips. 6.3 Equipotential grounding terminal boards shall be reserved for each area controller (box pressure) in the tunnel and for the planned installation of monitoring, fire protection, ventilation, lighting and other electromechanical system equipment. The equipotential grounding terminal shall be reliably welded and connected to the steel mesh of the tunnel structure. 6.4 Signal and power cables in the tunnel shall be wired with metal bridges within 0cm from the tunnel mouth, and connected to the equipotential bonding strips at least at two locations: the laying of power supply cables and signal cables shall comply with the provisions of Table 5.3.4-2 of GB50343-2012. 6.5 Metal objects such as metal support poles of cameras outside the tunnel entrance should be connected to the common grounding system of the tunnel nearby. If they are far away (more than 20m), independent grounding devices can be set up, and their impact grounding resistance should not be greater than 106.6 The power supply line outside the tunnel entrance should be laid with metal outer sheath power cables. SPDs should be installed in the external distribution box. Its voltage protection level should not be lower than the requirements of Class I test. When the requirements are not met, a coordinated post-SPD should be used to ensure that the required effective protection level is achieved. SPDs should be installed in the distribution box inside the tunnel, and its voltage protection level should not be lower than the requirements of Class II test. 6.7 SPDs should be installed separately at the power supply ends of monitoring equipment outside the tunnel (illuminance meters, variable speed limit signs, etc.), information boards, cameras, etc., and their voltage protection levels should not be lower than the requirements of Class I test. When the requirements are not met, a coordinated post-SPD should be used to ensure that the required effective protection level is achieved. The signal metal wires should be equipped with matching signal line SPDs at the ends of the wires. For data signal lines of various network systems located above areas with frequent lightning, if the length is greater than 30m and less than 50m, an adapted SPD should be installed at the input of the terminal equipment at one end; if the length is greater than 50m, an adapted SPD should be installed at the input of the terminal equipment at both ends. 6.8 The power supply of the monitoring equipment in the tunnel (vehicle detector, speedometer, camera, etc.) should be equipped with SPD, and its voltage protection level should not be lower than the requirements of Class III test. The input end of the relevant signal metal cable should also be equipped with an adapted signal line SPD3
QX/T499—2019
6.9 The input end of the UPS power supply for emergency power supply should be equipped with SPD. Its voltage protection level should not be lower than the requirements of Class II test. The DC input end of the UPS should be equipped with an SPD that meets the DC voltage requirements. 6.10 For lightning protection of tunnel equipment, please refer to Appendix B. 7 Lightning protection for external equipment
7.1 The external electromechanical system equipment along the road traffic electronic monitoring system should use its own metal frame or install a lightning rod on its top for direct lightning protection. The protection range is calculated according to the rolling ball radius of 60m. No lightning protection measures are required for those within the direct lightning protection range of GB50057-2010.
7.2 The metal support components of the external electromechanical system equipment should be used as down conductors. 7.3 The concrete foundation steel bars of the external equipment should be used as grounding devices in priority. The impact grounding resistance value should not be greater than 10Ω. When the requirements cannot be met, an artificial grounding body should be added. The artificial grounding body should be radial. 7.4 The grounding devices of adjacent electromechanical system equipment should be connected to each other. 7.5 The power supply and signal cables of the external electromechanical system equipment should be laid in metal pipes or buried with cables with shielding layers. The cable shielding layer and the external shielding body should be grounded at both ends.
7.6 The distribution box of the equipment in the field electromechanical system should be installed with SPDs of industrial type test, and its protection level should be adapted to the withstand voltage level of the protected equipment: when the requirements are not met, a coordinated downstream SPD should be used to ensure that the required effective protection level is achieved. Signal and control ports should be equipped with adaptive signal surge protectors.
7.7 All metal components such as the video detection unit, intelligent fill light unit, storage management unit, etc. should be reliably electrically connected to the reserved equipotential grounding terminal board nearby.
7.8 The low-voltage power cable should be laid rationally throughout the entire journey from the transformer to the distribution room. 7.9 When the electromechanical system equipment is powered by TN AC distribution, the power supply line should adopt the TN-S system. 7.10 The power supply overvoltage protection of the power supply line should adopt hierarchical protection. Use the corresponding SPL for graded protection on the low-voltage side of the transformer, low-voltage distribution room (cabinet), distribution room (parallel) in the building (floor), AC distribution panel (box) in the machine room, AC panel of switching power supply, distribution cabinet of power equipment and ports of fine power equipment.
7.11 For the installation location of SPD of electronic capture system, please refer to Appendix C. 8 Lightning protection of communication system
8.1 All kinds of communication lines entering the building should be properly introduced. When the cables with metal sheath are introduced, the metal sheath should be grounded; cables without metal outer sheath should be introduced through steel management and reliably electrically connected to the grounding device at the place of entry. 8.2 Optical fiber lightning protection measures are as follows:
a) Communication transmission optical cables should be laid directly buried, and the sheath of direct buried optical cables should be centrally grounded at the joints. The metal sheath or reinforced core of the optical cable should be grounded
b) The metal shielding layer, reinforced core or armor layer at the end of the optical cable entering the machine room should be connected to the equipotential connection belt of the first fiber digital distribution frame. The power supply end of the optical terminal should be equipped with an appropriate SPDWww.bzxZ.net
8.3 The lightning protection measures for metal cables are as follows: a) Communication metal cables used for long-distance transmission should be laid underground with shielded cables or through metal pipes, and the burial depth should not be less than 0.7m.
In areas with frequent lightning and strong lightning, when metal cables are buried, lightning arresters (drainage wires) should be laid parallel to them about 30cm above them. Drainage wires should be made into a group of artificial grounding bodies every 200m, and the impact grounding resistance value should not be greater than 30Q. Communication metal cables entering the machine room should be introduced by direct burial or cable trench, and should be protected by armored cables or steel pipes, and should not be brought into the room in the same pipe trench as power supply cables.
QX/T499—2019
Metal cables in buildings should be laid in metal bridges (pipes, troughs), and the bridges (pipes, troughs) should be electrically connected throughout.Both ends and the junctions of different lightning protection zones should be reliably grounded. The signal cables and power supply cables in the building should not be laid in parallel with the same pipe trough. The main distribution frame (MDF) of the communication system should be grounded nearby, and the appropriate signal line SPD should be installed at the main distribution frame (MDF). The empty wires in the metal signal cables that are not connected to the main distribution frame (MDF) should be grounded accordingly. The metal shielding layer of the feeder in the antenna feeder system of wireless communication should be grounded nearby at both ends of the cable. If the length is greater than 60m, the metal outer sheath should be grounded again at its center. The beginning and end ends of the outdoor feeder bridge and cable trough should also be connected to the adjacent equipotential connection terminals.
h) The metal data signal lines of various network systems located above the mine-prone areas, if the length is greater than 30m and less than 50m, should be installed with an appropriate SPD at the input port of the terminal equipment at one end; if the length is greater than 50m, the appropriate SPD should be installed at the input port of the terminal equipment at both ends.
Industry Standard Information Service Platform
QX/T499-2019
Appendix A
(Informative Appendix)
Schematic diagram of lightning protection zone division of road traffic electronic monitoring system Figure A, 1 gives the division of lightning protection zone of road traffic electronic monitoring system. L.P20.
LPzI area
LPZO area
LP20, area
Transformer
LPZI area
Protected equipment
LPZ0, area
Road monitoring system
Cables, pipelines
Distribution line buried introduction
PZI area
LP22 area
Main machine room
LPZ1 area
Industry standard information service platform
Division of lightning protection zones for road traffic electronic monitoring system Appendix B
(Informative Appendix)
Lightning protection diagram for tunnel electromechanical equipment
Figure B.1 gives the lightning protection diagram for tunnel electromechanical equipment. Dual-circuit power supply
High-voltage distribution cabinet
Monitoring: communication UPS
Monitoring communication
Distribution box
Switch type SPD
Voltage-limiting SPD
High-voltage distribution rental
Second level
Emergency lighting UPS
Lighting system distribution box
Data concentrator
Various data and signal SPD
Ventilation power supply equipment distribution box| |tt||First level
Runwai distribution box
Second level
Light heater
Power supply for monitoring equipment outside the cave
Signal for monitoring equipment outside the cave
Power supply for monitoring equipment inside the cave
Signal for monitoring equipment inside the cave
Vehicle monitor, anemometer, camera, etc.
QX/T499—2019
Second level
Power distribution box in the computer room
Monitoring , communication, fire alarm system, variable information board power supply
Variable information board signal
Pan-tilt camera outside the cave
Service platform
QX/T499—2019
Appendix C
(Informative Appendix)
Electronic capture system SPD installation position
Figure C.1 and Figure C.2 respectively give the installation of the electronic capture system power supply system SPD and signal line SPD Position frequency lamp
Camera pole
Temperature control fan
Switch type SPD Voltage limiting SPD
Optical transceiver
Regulated power supply
Switch
Floor-standing chassis
Floor-standing chassis
LED lamp
Fiber optic transceiver
HD snapshot
Camera
Panoramic monitoring
Camera
Vehicle detector
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