Technical specifications for inspection of lightning protection system on expressway facilities
Some standard content:
ICS07.060
Meteorological Industry Standard of the People's Republic of China
QX/T211—2019
Replaces QX/T211-2013
Technical specifications for inspection of lightning protection system on expresswayfacilities
Industry Standard Information Service Platform
Published on 2019-09-18
China Meteorological Administration
Implemented on 2019-12-01
Industry Standard Information Service Platform
Normative Reference Documents
Terms and Definitions
Basic Requirements
Working Procedures
Testing Instruments and Equipment
Testing Report
Testing Period
Testing Items and Technical Requirements||tt ||Buildings
Gas stations
Electromechanical systems
Communication systems
5.5 Grounding resistance
Appendix A (Informative Appendix)
Appendix B (Normative Appendix)
Appendix C (Normative Appendix)
Appendix D (Informative Appendix)
References
Original record table for lightning protection device detection
Technical requirements for lightning protection devices
Test method for grounding resistance value
Conversion of impulse grounding resistance and power frequency grounding resistance QX/T 211—2019
Industry standard information service platform
QX/T211—2019
This standard was drafted in accordance with the rules given in GB/T1.12009. This standard replaces QX/T211—2013 "Technical Specifications for Lightning Protection Device Detection of Highway Facilities". In addition to the editorial changes compared with QX/T211-2013, the main technical changes are as follows: the scope of the standard has been modified (see Chapter 1, Chapter 1 of the 2013 edition); the normative references have been modified (see Chapter 2, Chapter 2 of the 2013 edition); the terms and definitions of electrical systems have been deleted (see 3.4 of the 2013 edition); the definitions of lightning protection devices, artificial grounding bodies, grounding resistors, lightning protection equipotential bonding, and magnetic shielding have been modified (see 3.5, 3.8, 3.9, 3.11, 3.13, 3.4, 3.6, 3.9, 3.10, 3.12, 3.14 of the 2013 edition); the requirements for testing organizations and personnel have been deleted (see 4.1 of the 2013 edition); the contents of the investigation of the on-site environment and related materials have been modified (see 4.1 .2, 4.2.2 of the 2013 edition) deleted the relevant content and clauses on anti-static in the standard (see 4.1.2 e, 5.3.1.5, 5.5.3, 5.5.4, 4.2.2 e, 5.2.9, 5.3.1.5, 5.4.3, 5.4.4, 5.4.6 of the 2013 edition); modified the verification requirements for testing instruments and equipment (see 4.2, 4.3 of the 2013 edition); modified the requirements for test reports (see 4.3.3, 4.4.3 of the 2013 edition); modified the inspection requirements for lightning arresters (see 5.1.1.1, 5.1.1.3, 5.1.1.4, 5.1.1.1, 5.1.1.3, 5.1.1.4 of the 2013 edition);
modified the inspection requirements for down conductors (see 5 .1.2.3, 5.1.2.4, 5.1.2.3, 5.1.2.4 of the 2013 edition); added the inspection requirements for down conductor protection against contact voltage (see 5.1.2.5); modified the inspection requirements for grounding devices (see 5.1.3.1, 5.1.3.1, 5.1.3.2 of the 2013 edition); added the inspection requirements for grounding devices against step voltage (see 5.1.3.4); modified the inspection requirements for equipotential bonding (see 5.1.4.5, 5.1.4.5 of the 2013 edition); modified the inspection requirements for SPD (see 5.1.6.1, 5.1.6.2, 5.1.6.1, 5.1.6.2 of the 2013 edition); modified the test parameters and method requirements for SPD installed in low-voltage distribution systems (see 5.1.6.6 , 5.1.6.6 of the 2013 edition); modified 5.3. of the 2013 edition to Section 54 (see 5.4, 5.3.4 of the 2013 edition); modified the requirements for transition resistance when adopting electrical connection, equipotential connection and jumper connection (see 5.5.5, 5.5.6, 5.4.5 of the 2013 edition);
- Modified the contents of Tables A.1 and A.3 in Appendix A (see Appendix A.1 and A.3, 2013 edition); modified the contents of Tables B.1, B.2, B.3 and B.4 in Appendix B (see Appendix B, 2013 edition); modified the nature of Appendix C (see Appendix C, 2013 edition); modified the content of D.4 in Appendix D (see Appendix D, 2013 edition). This standard is proposed and managed by the National Technical Committee for Standardization of Lightning Disaster Prevention Industry. Drafting units of this standard: Hubei Lightning Protection Center, Jiangsu Meteorological Disaster Prevention Technology Center, Wuhan Meteorological Bureau, Wuhan Tianhong Lightning Protection Testing Center Development Co., Ltd.
Main drafters of this standard: Wang Xueliang, Feng Minxue, Liu Xuechun, Yu Tianye, Jiao Xue, Huang Kejian, Shi Yajing, Li Guoke, Li Xin, Zhu Chuanlin, Zhang Kejie, He Shan, Chen Renjun, Zhang Qian, Zhu Qinchao, Li Fei The previous versions of the standards replaced by this standard are: -QX/T211—2013.
1 Scope
Technical Specifications for Lightning Protection Devices for Highway Facilities This standard specifies the basic requirements, test items and technical requirements for the detection of lightning protection devices for highway facilities. This standard applies to the detection of lightning protection devices for highway facilities. 2 Normative Reference Documents
QX/T211—2019
The following documents are indispensable for the application of this document. For any dated referenced document, only the dated version applies to this document. For any undated referenced document, the latest version (including all amendments) applies to this document. GB/T21431—2015 Technical Specification for Testing of Lightning Protection Devices for Buildings GB50057-—2010 Specification for Lightning Protection Design of Buildings GB50343-2012 Technical Specification for Lightning Protection of Electronic Information Systems in Buildings QX/T190-2013
Design Specification for Lightning Protection of Expressway Facilities
3 Terms and Definitions
The following terms and definitions apply to this document. 3.1
expressway
Expressway
Has four or more lanes, a central dividing strip, all grade-separated intersections, and complete traffic safety facilities, management facilities, and service facilities, all controlled entry and exit, and is a highway dedicated to high-speed driving of automobiles. [JTJ002—1987, definition 2.0.1]
Expressway facilities
Expressway facilities
Various ancillary buildings along the expressway, main projects such as bridges and tunnels in the expressway, and related expressway electromechanical systems.
Electronic and mechanical system
mechanical & electronic systemfillingstation
Gas filling station
Gas filling station, gas filling station, and gas filling station. [GB50156—2012, definition 2.1.1]
Lightning protection system
lightning protection system;LPSLightning protection system
The entire system used to reduce the physical damage caused by lightning to buildings. Note 1: LPS consists of two parts: external and internal lightning protection devices. 1
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Note 2: Rewrite GB/T21714.1—2015, definition 3.42. 3.6
earth-terminationsystem
grounding device
the sum of the grounding body and the grounding wire, used to conduct lightning current and disperse it into the earth. [GB500572010. definition 2.0.10]
common earthingsystem
common earthingsystem
the grounding device of the lightning protection system, the metal components of the building, the low-voltage distribution protection line (PE), the equipotential connection terminal board or connection belt, the equipment protection ground, the shielding body grounding, the anti-static grounding, the functional grounding, etc. are connected together to form a common grounding system. [GB50343—2012. definition 2.0.6]
artificialearthelectrode
Artificial earthing electrode
Earthing electrode buried for grounding. Artificial earthing electrodes can be divided into artificial vertical earthing electrodes and artificial horizontal earthing electrodes [GB/T21431-2015. Definition 3.5]
Earthing resistance
Earthing resistance
The resistance of the grounding device to the remote potential zero point. Note 1: The value is the ratio of the potential difference between the grounding device and the remote potential zero point to the current flowing into the ground through the grounding device. The grounding resistance obtained by impulse current is called impulse grounding resistance: the grounding resistance obtained by power frequency current is called power frequency grounding resistance*. Note 2: Rewrite DL/T475-2017, definition 3.7. 3.10
natural earthing electrode
natural earthing electrode
General term for various metal components, metal parallel pipes, steel bars in concrete, etc. that have good contact with the earth and have the function of grounding but are not specially set for this purpose.
[GB50343-2012.Definition 2.0.7]
lightning equipotential bonding;LEB connects separate metal objects directly to the lightning protection device with a connecting conductor or through a surge protector to reduce the potential difference caused by lightning current.
[GB50057-2010.Definition 2.0.19]
surgeprotectivedevice;SPD
electric protection device
En service level
device used to limit transient overvoltage and discharge surge current. It contains at least one nonlinear element. [GB50057—2010. Definition 2.0.29]
Magnetic shield
A closed metal grid or continuous shield that surrounds the building to be protected or part of it, used to reduce the failure of electrical and electronic systems.
【GB/T21714.12015. Definition 3.52
*In this standard, all grounding resistances that are not marked as impulse grounding resistances refer to power frequency grounding resistances. 2
Lightning protection zone; LPZQX/T211—2019
A zone that divides the electromagnetic environment for lightning strikes. 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]
4 Basic requirements
4.1 Working procedures
4.1.1 The working procedures for lightning protection device inspection should be carried out according to Figure 1. Accept the inspection task
Carry out on-site environment and related data investigation
Formulate inspection planbZxz.net
Confirm the status of inspection instruments and equipment
On-site inspection and measurement
Record and organize inspection data
Calculation analysis and result determination
Industry association
Issue inspection report
The on-site environment and related data investigation should include: b) Classify the lightning protection category of buildings according to the provisions of Chapter 3 and 4.5.1 of GB50057-2010; b)
Information service
Divide the lightning protection zone according to the provisions of Chapter 4 of QX/T190-2013, and review the lightning protection engineering design and construction files of the inspected places: check the installation and laying methods of lightning arresters and down conductors; check the grounding type and equipotential connection status; check the grounding type of low-voltage distribution system and electronic system, the setting and installation process of SPD, pipeline layout and magnetic shielding measures, etc.
4.1.3 The grounding resistance of the lightning protection device should be measured on non-rainy days and when the soil is not frozen. The on-site environmental conditions should be able to ensure normal detection. 4.1.4
The data of on-site detection of lightning protection devices should be recorded in a special original record form and signed by the detection personnel. The detection record should be filled in with a fountain pen or a signature pen, with neat and clear handwriting and should not be altered: to correct errors, two straight lines should be drawn on the original data, and the correct data should be filled in above it, and signed or stamped with the seal of the person who modified it. 4.1.5 For the format of the original record form for lightning protection device detection, please refer to Appendix A. 3
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4.2 Testing instruments and equipment
4.2.1 The accuracy level of instruments, meters and test tools used for on-site testing shall meet the accuracy requirements of the measured parameters. 4.2.2 Instruments, meters and test tools used for on-site testing shall be verified/calibrated, within the validity period of verification/calibration, and in normal condition.
4.2.3 Instruments, meters and test tools used for on-site testing shall be replaced or repaired in time when failure, damage or error exceeding the allowable value is found during the test. The repaired instruments, meters and test tools shall be verified/calibrated and can only be used after meeting the accuracy requirements, and the previous test shall be re-inspected.
4.3 Test report
4.3.1 After the on-site test is completed, the recorded test data shall be sorted and analyzed, and a test report shall be issued in time. 4.3.3 The test report shall make a clear conclusion on whether the tested items meet the requirements of this standard or design documents and their specifications. 4.3.3 The test report should include:
- Name of the inspected unit;
- Main technical standards, main instruments and equipment used; test content, test items, test conclusions; - Test date, report completion date and next test time; - Signatures of test, review and approval personnel; stamped with the test agency's special seal or the official seal of the test agency. 4.4 Test cycle
4.4.1 Lightning protection devices shall be subject to a regular inspection system and shall be inspected once a year, of which the lightning protection devices of gas stations shall be inspected once every six months. 4.4.2 For places with frequent lightning strikes or a history of lightning damage, the number of inspections should be increased. 5 Inspection items and technical requirements
5.1 Buildings
5.1.1 Lightning terminals
5.1.1.1 Check the material specifications (including diameter, cross-sectional area, thickness), support card spacing, welding process with down conductors, anti-corrosion measures, protection range, grid size of lightning network and safety distance between lightning terminals and protected objects. The material specifications and installation process of lightning terminals shall comply with the requirements of Table B.1 in Appendix B.
5.1.1.2 Check the appearance of lightning terminals. There shall be no obvious mechanical damage, fracture or serious rust. 5.1.1.3 Check whether there are other electrical and electronic circuits attached to the lightning terminals. The attached electrical and electronic circuits shall use cables with metal sheaths directly buried in the soil or wires passing through metal pipes. The metal sheath or metal of the cable should be grounded, and the length buried in the soil should be more than 10m before it can be connected to the ground of the distribution device or connected to the power line, low-voltage distribution equipment grid control 5.1.1.4 Test the electrical connection between the lightning rod and each down conductor, the roof electrical and electronic equipment and metal components and the lightning protection device, the side lightning protection device and the grounding device, etc., which should meet the requirements of 5.5.5. 5.1.2 Down conductor
5.1.2.1 Check the setting, material specifications (including diameter, cross-sectional area, thickness), welding process, and anti-corrosion measures of the down conductor. The material specifications and installation process of the down conductor should meet the requirements of Table B.2 in Appendix B. 5.1.2.2 Check the appearance of the down conductor. There should be no obvious mechanical damage, breakage, or severe rust. 4
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5.1.2.3 Check the distance between various electrical and electronic circuits and down conductors. The horizontal clearance should not be less than 1m. The cross clearance should not be less than 0.3m.
5.1.2.4 Check the distance between down conductors and the distance between the dedicated down conductor and the edge of the entrance or sidewalk, which should meet the requirements of Table B.2. 5.1.2.5 Check the anti-contact voltage measures of the down conductor, which should meet the requirements of Table B.2. 5.1.3 Grounding device
Check the grounding type, grounding body material, anti-corrosion measures, material specifications, cross-sectional area, thickness, burial depth, welding process, and connection with 5.1.3.1
down conductor. The material specifications and installation process of the grounding device should meet the requirements of Table B.3 in Appendix B. 5.1.3.2 During the first inspection, the distance between adjacent grounding bodies in the ground when no equipotential connection is performed should be checked. 5.1.3.3 The test method of grounding resistance of grounding device is shown in Appendix C. 5.1.3.4 Check the anti-step voltage measures of grounding device, which shall meet the requirements of Table B.3 5.1.4 Equipotential connection
5.1.4.1 Check the equipotential connection measures taken by large-sized metal parts such as the metal surface of the roof, the metal surface of the facade, and the steel bars in the concrete of the building, and test their electrical connection with the grounding device, which shall meet the requirements of 5.5.5 5.1.4.2 Check the metal parts passing through the junction of each lightning protection zone, as well as the equipment, metal pipes, cable trays, cable metal sheaths, metal frames, steel roof trusses, metal doors and windows and other large metal objects in the building. They should be connected to the grounding device or equipotential connection plate (strip) nearby. Test their electrical connection, which should meet the requirements of 5.5.5. 5.1.4.3 Check the installation position, material specifications, connection method and process of the equipotential grounding terminal board and connecting wire. The material specifications and installation process of the side lightning protection and lightning electromagnetic pulse protection device should meet the requirements of Table B.4 in Appendix B. 5.1.4.4 Check the installation position of each equipotential grounding terminal board. It should be set in a position that is convenient for installation and inspection, and should not be set in a place that is humid or has corrosive gases and is susceptible to mechanical damage. 5.1.4.5 Check the electrical connection status of the railings, doors and windows and other large metal objects on the outer walls of the second and third type lightning protection buildings with a height of more than 60m and the corresponding height and above, and test their electrical connection. It should meet the requirements of 5.5.5. 5.1.5 Magnetic shielding
5.1.5.1 Check the shielding layer. The shielding layer should be connected to the same potential at least at both ends and preferably at the junction of each lightning protection zone, and connected to the lightning protection grounding device. Test its electrical connection, which should meet the requirements of 5.5.5. 5.1.5.2 Check the metal pipes, metal grids or reinforced concrete pipes with grid-shaped shielded cables between buildings. Both ends should be electrically connected and connected to the equipotential bonding strips of their respective objects. Test their electrical connections and they should meet the requirements of 5.5.5.
5.1.5.3 Check the equipotential connection of shielding grids, metal pipes, metal troughs, metal grids, large-sized metal parts, metal keels on room roofs, metal surfaces on roofs, metal surfaces on facades, metal doors and windows, metal grids and cable shielding layers. Test their electrical connections and they should meet the requirements of 5.5.5 service level
.
5.1.6.1 Check the technical parameters of the low-voltage distribution system and the selected SPD and they should meet the design requirements. 5.1. 6.2 Check the line length between SPDs. When multiple SPDs are installed on a low-voltage distribution line, the line length between SPDs should meet the technical requirements provided by the manufacturer. If there are no technical requirements, the line length between the voltage-switching SPD and the voltage-limiting SPD should not be less than 10m, and the line length between the voltage-limiting SPDs should not be less than 5m. If the length does not meet the requirements, a decoupling element should be installed. 5.1.6.3 Check that the status indicator of the SPD is in normal working condition. 5.1.6.4 Check that the connecting wires of each level of SPD are straight. The total length of the connecting wire of each SPD should not exceed 0.5m, and the cross-sectional area of the connecting wire should meet the requirements of Table B.5.
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5.1.6.5 Test The electrical connection between the SPD grounding terminal and the grounding device shall comply with the requirements of 5.5.5. 5.1.6.6 The test parameters and methods of the SPD installed in the low-voltage power distribution system shall comply with the provisions of 5.8.5.1 and 5.8.5.2 in GB/T21431-2015
5.2 Gas station
5.2.1 Check that there are no less than two lightning protection grounding points for oil (gas) tanks and gas cylinders. Test its grounding resistance and it shall comply with the requirements of 5.5.4. 5.2.2 Check that the metal components of the oil (gas) tank and tank room, as well as metal accessories such as breathing valves, oil measuring holes, vent pipes, fuel dispensers and safety valves should be grounded and electrically connected. Test its grounding resistance and the transition resistance of the electrical connection and they shall comply with 5.5.4 and 5.5 respectively. .6 requirements, 5.2.3 Check the grounding conditions at the beginning and end of long-distance non-branched pipelines and at the bends and bifurcations of the pipelines. Test its grounding resistance, which shall meet the requirements of 5.5.4.
5.2.4 Check the grounding conditions of metal pipelines entering and exiting the gas station. Pipelines within 100m from the building should be grounded every 25m. Test its grounding resistance, which shall meet the requirements of 5.5.4. 5.2.5 Check that when the net distance between parallel pipelines is less than 0.1m, electrical connections should be made every 20m to 30m; when the pipelines cross and the net distance is less than 0.1m, electrical connections should be made. Test its electrical connection, which shall meet the requirements of 5.5.6. 5.2.6 Check that the flanges of the pipelines should be connected by jumpers. In a non-corrosive environment, no less than 5 bolts can be connected without jumpers. Test its jumper connection, which shall meet the requirements of 5.5.6.
5.2.7 Check the connection between the metal sheath (cable metal protective tube) of the fueling and gas pipelines and the filling equipment cables and the grounding device. Test its electrical connection, which shall meet the requirements of 5.5.6. 5.2.8 Check that the connection points of the refueling and gas filling hoses (rubber hoses) at both ends shall be connected with metal soft copper wires. Test its jumper connection, which shall meet the requirements of 5.5.6.
5.2.9 Check that the SPD installed on the low-voltage distribution lines and signal lines of the refueling and gas filling station shall meet the requirements of 5.1.6. 5.3 Mechanical and electrical system
5.3.1 Machine room
Check the location of the machine room in the building, which shall be in the LPZ1 area and its subsequent lightning protection area in the center of the lower floor of the building. 5.3.1.1
5.3.1.2 Check that the distance between the machine room and the external wall, columns and beams shall not be less than 1m. 5.3.1.3 Check that the metal doors and windows and metal shielding nets of the machine room and the main structural reinforcement in the building shall be reliably electrically connected. 5.3.1.4 Check the specifications of the potential connection strips installed in the machine room, which should meet the requirements of Table B.4. 5.3.1.5 Check the material specifications and installation process of the potential connection strips of the cabinets, metal shells, etc. in the machine room, which should meet the requirements of Table B.4. Test their electrical connections, which should meet the requirements of 5.5.5. 5.3.1.6 Check the SPDs installed on the low-voltage distribution lines and signal lines in the machine room, which should meet the requirements of 5.1.6. 5.3.1.7 Check the metal pipes, metal troughs, and metal cable screens entering and exiting the machine room, which should be connected to the grounding bus nearby. 5.3.1.8 Check the grounding wires in the machine room, which should be led from the common grounding device to the local grounding terminal board of the machine room.
5.3.2 Toll Island Electromechanical System
5.3.2.1 Check the grounding type of the weighing system, toll collection system and toll ceiling lightning protection system, which shall meet the requirements of the lightning protection design plan; the material specifications and installation process of the grounding device shall meet the requirements of Table B.4. Test its grounding resistance, which shall meet the requirements of 5.5.2 and 55.3. 5.3.2.2 Check the material specifications and installation process of all metal components such as toll booths, automatic barriers, signal lights, lane guardrails, columns, lane camera support frames (poles), handrails and doors of underground passages connected to the toll island common grounding device, which shall meet the requirements of Table B.4. Test its electrical connection, which shall meet the requirements of 5.5.5.
5.3.2.3 Check the metal cabinets in the toll booth and the metal shells of various electromechanical equipment, which shall be electrically connected to the equipotential grounding terminal board reserved in the toll booth. Test its electrical connection, which shall meet the requirements of 5.5.5. 6
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5.3.2.4 Check the material specifications and installation process of the equipment housing, metal frame, metal outer sheath of the cable or the threading metal pipe of the weight toll collection system and the connection with the common grounding system of the toll island, which shall meet the requirements of Table B.4. Test its electrical connection, which shall meet the requirements of 5.5.5.5.3.2.5 Check the SPD installed at different interfaces of the low-voltage distribution lines and signal lines entering and exiting the toll booth, which shall meet the requirements of 5.1.6.
5.3.3 External electromechanical system
5.3.3.1 Check that the variable information signs, meteorological monitoring instruments, vehicle detectors (excluding road paving) and monitoring camera probes are within the effective protection range of the lightning arrester.
5.3.3.2 The laying form and shielding measures of the transmission lines and distribution lines of the variable information signs, meteorological monitoring instruments, vehicle detectors and monitoring camera systems shall meet the requirements of the lightning protection design plan. The shielding layer should maintain electrical connectivity. Test its electrical connection and it should meet the requirements of 5.5.5.
5.3.3.3 The down conductor and grounding condition of the high pole lamp should meet the requirements of the lightning protection design plan. 5.3.3.4 The distance between the grounding grid of the independent lightning arrester and the common ground grid should meet the requirements of Table B.3. 5.3.3.5 The SPD installed at the ports of each signal line and control signal line of the monitoring system should meet the requirements of 5.1.6. 5.3.3.6 The SPD installed at different interfaces of the low-voltage distribution line of the monitoring system at each lightning protection zone should meet the requirements of 5.1.6. 5.3.3.7 Check the connection between the metal casing of vehicle detectors, meteorological monitoring instruments, variable information signs, chassis and grounding devices, and test their electrical connections. They should meet the requirements of 5.5.5. 5.3.4 Low-voltage power distribution system
5.3.4.1 Check the lightning protection devices of substations and distribution room buildings. They should meet the requirements of 5.1.1, 5.1.2 and 5.1.3. 5.3.4.2 Before the high-voltage overhead power supply line enters the substation or distribution room, it should be replaced with a metal sheathed or insulated sheathed power cable through a steel pipe for undergrounding. The buried distance should be no less than 50m to the input end of the transformer. 5.3.4.3 Check the grounding type of the low-voltage distribution system. When the low-voltage distribution system adopts the TN system, it should be checked that the low-voltage distribution line drawn from the main distribution board of the building should adopt the TN-S system. 5.3.4.4 The cables of each distribution line drawn from the distribution room should be laid underground with shielded cables or through steel pipes, and the shielding layer or the steel pipe should be grounded nearby at both ends. The shielding layer or the steel pipe should be electrically connected. Test its electrical connection with the grounding device, which should meet the requirements of 5.5.5.
5.3.4.5 Check that the shielding layer or the steel pipe of the direct buried cable connected to the external field equipment should be grounded nearby at both ends, and the shielding layer or the steel pipe should be electrically connected. Test the electrical connection between it and the grounding device, which shall meet the requirements of 5.5.5. 5.3.4.6 The SPI installed on the low-voltage power distribution and lighting lines shall meet the requirements of 5.1.6. 5.3.4.7 Check the equipotential connection between the power supply box, distribution box, and branch line of the field equipment and the safety protection grounding, and test their electrical connection, which shall meet the requirements of 5.5.5.
5.3.5 Mechanical and electrical systems of bridges and tunnels
5.3.5.1 Check that the low-voltage power distribution lines and signal lines laid on the bridge deck should be shielded, and both ends of the screen layer should be grounded, and the shield layer or the wire-threading steel pipe should maintain electrical connectivity. Test its electrical connection, which shall meet the requirements of 5.5.5. 5.3.5.2 Check that the SPD installed on the low-voltage power distribution lines and signal lines of the bridge should meet the requirements of 5.1.6. 5.3.5.3 Check the lightning protection measures of the tunnel's vehicle detectors, meteorological monitoring instruments, environmental testing equipment, emergency telephone systems, variable information signs, fire CCTV monitoring, ventilation, driving signals, communications, broadcasting, power supply and distribution, lighting and other systems, which should meet the requirements of the lightning protection design plan.
5.3.5.4 Check the tunnel's environmental testing equipment, alarm and induction facilities, ventilation facilities, lighting facilities, fire-fighting facilities, local controller's power supply and distribution lines, and signal lines. Shielding measures should be taken, and both ends of the shielding layer should be grounded, and the shielding layer or threading steel pipe should maintain electrical connectivity. Test its electrical connection, which should meet the requirements of 5.5.5. 7
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5.3.5.5 Check the tunnel's environmental testing equipment, alarm and induction facilities, ventilation facilities, lighting facilities, fire-fighting facilities, local controller's low-voltage distribution lines, and SPD installed on the signal lines. They should meet the requirements of 5.1.6. 5.3.5.6 Check the lightning protection measures of the tunnel monitoring center, which shall meet the requirements of 5.3.1. 5.4 Communication system
5.4.1 Check the lightning protection devices of the communication station and communication tower, which shall meet the requirements of 5.1.1, 5.1.2 and 5.1.3. 5.4.2 The communication room shall meet the requirements of 5.3.1. 5.4.3 Check the laying form and shielding measures of the communication lines, which shall meet the requirements of the lightning protection design plan. The shielding layer shall maintain electrical connectivity. Test its electrical connection, which shall meet the requirements of 5.5.5. 5.4.4 Check the material specifications and installation process of the drainage wire buried above the buried optical cable or the overhead ground wire, which shall meet the requirements of the lightning protection design plan. Test its grounding resistance, which shall meet the requirements of 5.5.2 and 5.5.3. 5.4.5 Check that the metal components inside the optical cable shall be grounded at the manhole (handhole) and before it is introduced into the room. Test its grounding resistance, which shall meet the requirements of 5.5.2 and 5.5.3.
5.4.6 Check each connection point of the metal armor layer or shielding layer of the direct buried cable, which shall maintain electrical connectivity and both ends shall be grounded. Test its grounding resistance, which shall meet the requirements of 5.5.2 and 5.5.3. 5.4.7 The emergency telephone box shall be grounded. Test its grounding resistance value, which shall not exceed 10Q. 5.4.8 The SPDs installed at different interfaces of the low-voltage distribution lines and signal lines of the communication system at each lightning protection zone shall meet the requirements of 5.1.6.
5.5 Grounding resistance
5.5.1 The grounding resistance of lightning protection devices for highway buildings, gas stations, and electromechanical systems shall meet the requirements of the lightning protection design plan. 5.5.2 For the first type of lightning protection buildings, independent grounding devices shall be used, and the impulse grounding resistance of each down conductor shall not be greater than 10Ω; for the second type of lightning protection buildings, the impulse grounding resistance of each down conductor shall not be greater than 102; for the third type of lightning protection buildings, the impulse grounding resistance of each down conductor shall not be greater than 30Q2. For the conversion method of impulse grounding resistance and power frequency grounding resistance, please refer to Appendix D. 5.5.3 When a common grounding system is used for building lightning protection grounding, protective grounding and grounding of electronic systems, the grounding resistance value of the common grounding system shall be determined according to the minimum resistance required in the access equipment. 5.5.4 The service grounding, working grounding, protective grounding and grounding of information technology equipment of gas stations should share a common grounding device, and its grounding resistance should not be greater than 42. When each grounding device is set up separately, its grounding resistance should not be greater than 102, and the protective grounding resistance should not be greater than 42: The grounding resistance of the grounding device at the beginning and end of the above-ground oil, liquefied oil and compressed natural gas pipelines and at the bends and bifurcations of the pipeline should not be greater than 302; the impulse grounding resistance of the metal pipelines entering and leaving the gas station should not be greater than 30Q. 5.5.5 When electrical connection and equipotential connection are adopted, the over-resistance should not be greater than 0.22. Information Service Platform
5.5.6 When electrical connections such as jumper connections are adopted in the gas station, the transition resistance should not be greater than 0.032.85 Check that the metal components inside the optical cable should be grounded at the manhole (handhole) and before it is introduced into the machine room. Test its grounding resistance, which should meet the requirements of 5.5.2 and 5.5.3.
5.4.6 Check that each connection point of the metal armor layer or shielding layer of the direct buried cable should maintain electrical connectivity and both ends should be grounded. Test its grounding resistance, which should meet the requirements of 5.5.2 and 5.5.3. 5.4.7 The emergency telephone box should be grounded. Test its grounding resistance value, which should not be greater than 10Q. 5.4.8 The SPDs installed at different interfaces of the low-voltage distribution lines and signal lines of the communication system in each lightning protection zone should meet the requirements of 5.1.6.
5.5 Grounding resistance
5.5.1 The grounding resistance of lightning protection devices for highway buildings, gas stations, and electromechanical systems should meet the requirements of the lightning protection design plan. 5.5.2 For the first type of lightning protection buildings, independent grounding devices shall be used, and the impulse grounding resistance of each down conductor shall not be greater than 10Ω; for the second type of lightning protection buildings, the impulse grounding resistance of each down conductor shall not be greater than 102; for the third type of lightning protection buildings, the impulse grounding resistance of each down conductor shall not be greater than 30Q2. For the conversion method of impulse grounding resistance and power frequency grounding resistance, please refer to Appendix D. 5.5.3 When a common grounding system is used for building lightning protection grounding, protective grounding and grounding of electronic systems, the grounding resistance value of the common grounding system shall be determined according to the minimum resistance required in the access equipment. 5.5.4 The service grounding, working grounding, protective grounding and grounding of information technology equipment of gas stations should share a common grounding device, and its grounding resistance should not be greater than 42. When each grounding device is set up separately, its grounding resistance should not be greater than 102, and the protective grounding resistance should not be greater than 42: The grounding resistance of the grounding device at the beginning and end of the above-ground oil, liquefied oil and compressed natural gas pipelines and at the bends and bifurcations of the pipeline should not be greater than 302; the impulse grounding resistance of the metal pipelines entering and leaving the gas station should not be greater than 30Q. 5.5.5 When electrical connection and equipotential connection are adopted, the over-resistance should not be greater than 0.22. Information Service Platform
5.5.6 When electrical connections such as jumper connections are adopted in the gas station, the transition resistance should not be greater than 0.032.85 Check that the metal components inside the optical cable should be grounded at the manhole (handhole) and before it is introduced into the machine room. Test its grounding resistance, which should meet the requirements of 5.5.2 and 5.5.3.
5.4.6 Check that each connection point of the metal armor layer or shielding layer of the direct buried cable should maintain electrical connectivity and both ends should be grounded. Test its grounding resistance, which should meet the requirements of 5.5.2 and 5.5.3. 5.4.7 The emergency telephone box should be grounded. Test its grounding resistance value, which should not be greater than 10Q. 5.4.8 The SPDs installed at different interfaces of the low-voltage distribution lines and signal lines of the communication system in each lightning protection zone should meet the requirements of 5.1.6.
5.5 Grounding resistance
5.5.1 The grounding resistance of lightning protection devices for highway buildings, gas stations, and electromechanical systems should meet the requirements of the lightning protection design plan. 5.5.2 For the first type of lightning protection buildings, independent grounding devices shall be used, and the impulse grounding resistance of each down conductor shall not be greater than 10Ω; for the second type of lightning protection buildings, the impulse grounding resistance of each down conductor shall not be greater than 102; for the third type of lightning protection buildings, the impulse grounding resistance of each down conductor shall not be greater than 30Q2. For the conversion method of impulse grounding resistance and power frequency grounding resistance, please refer to Appendix D. 5.5.3 When a common grounding system is used for building lightning protection grounding, protective grounding and grounding of electronic systems, the grounding resistance value of the common grounding system shall be determined according to the minimum resistance required in the access equipment. 5.5.4 The service grounding, working grounding, protective grounding and grounding of information technology equipment of gas stations should share a common grounding device, and its grounding resistance should not be greater than 42. When each grounding device is set up separately, its grounding resistance should not be greater than 102, and the protective grounding resistance should not be greater than 42: The grounding resistance of the grounding device at the beginning and end of the above-ground oil, liquefied oil and compressed natural gas pipelines and at the bends and bifurcations of the pipeline should not be greater than 302; the impulse grounding resistance of the metal pipelines entering and leaving the gas station should not be greater than 30Q. 5.5.5 When electrical connection and equipotential connection are adopted, the over-resistance should not be greater than 0.22. Information Service Platform
5.5.6 When electrical connections such as jumper connections are adopted in the gas station, the transition resistance should not be greater than 0.032.8
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