Standard No.: QX/T 498-2019
Standard Name: Technical Specifications
for Inspection of Lightning Protection System for Metro English Name: Technical Specifications for Inspection of Lightning Protection System for Metro ||tt
||Standard Format: PDF
Release Date: 2019-09-18
Implementation Date: 2019-12-01
Standard Size: 1672K
Standard Introduction: The 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. Drafting units of this standard: Beijing Meteorological Disaster Prevention Center, Shenzhen Meteorological Service Center, Hubei Lightning Protection Center, Sichuan Lightning Protection Center,
China Railway Eryuan Engineering Group Co., Ltd.
Main drafters of this standard: Li Rujian, Li Jingxiao, Qiu Zongxu, Li Guoliang, Zhang Lei, Han Menglei, Huang Sheng, Zhang Yi, Guo Hongbo, Duan Taoding, Lu Mao This standard specifies the general requirements, test methods, test contents and requirements for the detection of subway lightning protection devices
This standard is applicable to the detection of subway lightning protection devices
This standard is not applicable to the detection of subway vehicle lightning protection devices
2 Normative references
The following documents are indispensable for the application of this document. For all dated references, only the dated version applies to this document. For any undated referenced document, the latest version (including all amendments) shall apply to this document
GB/T21431-2015 Technical Specification for Testing Lightning Protection Devices for Buildings
GB50057-2010 Lightning Protection Design Specifications for Buildings
TB/T2311-2017 Lightning Protection Equipment for Railway Communication, Signaling and Power Electronic Systems
3 Terms and Definitions
The following terms and definitions shall apply to this document
Metro metro; subway
Rapid, large-capacity, electric-powered rail transit built in cities. Trains run on fully enclosed lines. Lines in the central urban area are basically located in underground tunnels, and lines outside the central urban area are generally located on viaducts or on the ground.
GB50157-2013, definition 2.0.1]
Operation Control Center operation cer; trol center; OCC
A workplace where dispatchers use central system operation terminal equipment such as communication, signal, integrated monitoring (power monitoring, environment and equipment monitoring, automatic fire alarm), automatic ticket vending and checking to centrally monitor, control, coordinate, command, dispatch and manage the operation of trains, stations, sections, vehicle bases and other equipment of the entire subway line (multi-line or full-line network), referred to as the control center
GB50157-2013, definition 2.0.46
This standard specifies the general requirements, testing methods, testing contents and requirements for the detection of subway lightning protection devices. This standard applies to the detection of subway lightning protection devices. This standard does not apply to the detection of subway vehicle lightning protection devices.

ICS07.060
Meteorological Industry Standard of the People's Republic of China
QX/T498—2019
Technical specifications for inspection of lightning protection system for subway metro Industry Standard Information Service Platform
Released on 2019-09-18
China Meteorological Administration
Implementation on 2019-12-01
Industry Standard Information Service Platform
Normative reference documents
Terms and definitions
General requirements
Test methods
6 Test contents and requirements
Appendix A (Normative Appendix)
Appendix B (Informative Appendix)
References
Grounding device test method
Schematic diagram of test location of grounding system in underground station of subway QX/T498—2019
Industry Standard Information Service Platform
QX/T498-2019
This standard was drafted in accordance with the rules given in GB/T1.1—2009. This standard is proposed and managed by the National Lightning Disaster Prevention Industry Standardization Technical Committee. Drafting units of this standard: Beijing Meteorological Disaster Prevention Center, Shenzhen Meteorological Service Center, Hubei Lightning Protection Center, Sichuan Lightning Protection Center, China Railway Eryuan Engineering Group Co., Ltd. The main drafters of this standard: Li Rujian, Li Jingxiao, Qiu Zongxu, Li Guoliang, Zhang Lei, Han Menglei, Huang Sheng, Zhang Yi, Guo Hongbo, Duan, Li Yiding, Lu Mao.
Industry Standard Information Service Platform
1 Scope
Technical Specifications for Testing of Subway Lightning Protection Devices This standard specifies the general requirements, testing methods, testing contents and requirements for the testing of subway lightning protection devices. This standard applies to the testing of subway lightning protection devices. This standard does not apply to the testing of subway vehicle lightning protection devices. 2 Normative Reference Documents
QX/T498—2019
The following documents are essential for the application of this document. For all dated referenced documents, only the dated version applies to this document. For any undated referenced document, the latest version (including all amendments) shall apply to this document. GB/T21431-2015 Technical Specification for Testing of Lightning Protection Devices for Buildings GB50057—2010 Specification for Lightning Protection Design for Buildings TB/T2311—2017 Lightning Protection Equipment for Railway Communication, Signaling and Power Electronic Systems 3 Terms and Definitions
The following terms and definitions apply to this document. 3.1
Metro metro;subway
A fast, high-capacity, electric-powered rail transit built in a city. Trains run on fully enclosed lines. Lines in the central urban area are basically located in underground tunnels, and lines outside the central urban area are generally located on viaducts or on the ground. [GB50157—2013. Definition 2.0.1]
Operation control centeroperationrentroleenter;occThe workplace where dispatchers use communication, signal, continuous monitoring (power monitoring, environment and equipment monitoring, automatic fire alarm), automatic ticket vending and other central system operation terminal equipment to centrally monitor, control, coordinate, command, dispatch and manage the operation of trains, stations, sections, vehicle bases and other equipment of the entire subway line (or the entire network), referred to as the control center [GB50157—2013, definition 2.0.46] 3.3
Depot
The basic production unit that parks vehicles and undertakes the operation management, maintenance and inspection of vehicles and the overhaul of fixed-frame repair vehicles.
［GB50157—2013. Definition 2.0.54
parking lot; stabling yard
Parking lot
Basic production unit for parking assigned vehicles and undertaking the operation management, maintenance and inspection of vehicles. LGB50157—2013, Definition 2.0.55
QX/T498—2019
Platform edge door platform edge door
Installed at the edge of the station platform, separating the track area for running trains from the platform waiting area, with a continuous barrier corresponding to the train door and capable of multi-pole control to open and close the sliding door.
[GB50157—2013, Definition 2.0.51]
Main equipotential earthing terminal board
Main equipotential earthing terminal board A metal plate that connects multiple grounding terminals together and is directly connected to the grounding device. [GB50343-2012.Definition 2.0.9]
Local equipotential earthing terminal board (row) local equipotential earthing terminal board for local equipotential connection network grounding in the electronic information system room. [GB50343-2012.Definition 2.0.11]
Lightning protection system; LPS lightning protection device
Used to reduce the material damage and personal injury caused by lightning on or near buildings (structures), it consists of an external lightning protection device and an internal lightning protection device.
Note: Rewrite GB50057--2010.Definition 2.0.5. 3.9
surge protective device; SPD
Surge protector
A device used to limit transient overvoltage and discharge surge current. It contains at least one nonlinear element. [GB50057—2010. Definition 2.0.29]
4 General requirements
Industry standard information service platform
4.1 Inspection items
The inspection items are as follows:
Lightning arrester;
b) Down conductor;
Grounding device:
Equipotential connection;
Surge protective device (SPD);
Lightning protection category.
4.2 Inspection cycle and time
4.2.1 The line should be inspected once a year after it is put into use. 4.2.2 The inspection of the newly built line should be carried out before the hot slip test, and the grounding resistance test should be carried out after the main structure of the station is completed and before the installation of electrical equipment
4.2.3 The inspection should be carried out after the frozen soil thaws and before the thunderstorm season arrives, and should not be carried out during thunder, rain, snow or immediately after rain or snow. 2
5 Detection method
5.1 The grounding resistance test method of the station shall comply with the requirements of Appendix A, and the large grounding device test method should be selected. QX/T498—2019
5.2 The equipotential connection between the metal components, equipment, cables, shielding layers and various metal pipeline troughs in the station and the lightning protection device shall be tested in accordance with Article 5.7 of GB/T21431—2015. 5.3 The detection method of the surge protector shall comply with Article 7.3.1.1 and Article 7.3.2.1 of TB/T23112017. 6 Detection content and requirements
6.1 Determination of lightning protection category
The classification of lightning protection categories for ground buildings shall be carried out in accordance with Chapter 3 of GB50057—2010. 6.2 Lightning rods and down conductors of above-ground buildings 6.2.1 The inspection of lightning rods and down conductors of above-ground buildings shall be carried out in accordance with 5.2 and 5.3 of GB/T21431-2015. 6.2.2 The following outdoor equipment shall be within the direct lightning protection range: cooling tower;
an antenna;
a subway logo light;
camera;
cable.
The protection range shall be calculated in accordance with Appendix D of GB50057-2010. 6.3 Grounding device
6.3.1 The grounding resistance value of the subway station grounding system shall meet the design requirements. The inspection method is shown in 5.1. See Appendix B for the schematic diagram of the test position of the subway station grounding system
6.3.2 Check the setting and quantity of the electrical, electronic and telecommunication terminal boards, and measure the grounding resistance value of each total equipotential terminal board. The measured value shall meet the industry standard
and the design requirements.
6.4 Equipotential bonding
Baixi Service Platform
6.4.1 The minimum cross-section of the equipotential bonding wire and the conductor connected to the grounding device shall comply with the provisions of Table 5.1.2 of GB50057-2010.
The following metal bodies can be used as equipotential bonding reference points: 6.4.2
The total equipotential grounding terminal board for electrical and electronic systems derived from the comprehensive grounding network: the local equipotential grounding terminal board in each electronic system room; the annular grounding belt in each transformer room;
the grounding busbar in the lighting distribution room:
the reserved grounding terminal for electromechanical equipment;
the reserved grounding terminal for electrical equipment on the top of the building. 6.4.3 The transition resistance value of the equipotential connection is tested using a test instrument with a no-load voltage of 4V to 24V and a minimum current of 0.2A. The transition resistance value should generally be less than or equal to 0.2Q6.4.4 The detection of equipotential connection of electrical and electronic systems shall comply with the following provisions: 3
QX/T498—2019
The electrical and electronic equipment and the external lightning protection device meet the requirements for the spacing distance; the connection requirements of the equipotential connection network form shall comply with the provisions of 6.3.4, paragraphs 5, 6, and 7 of GB500572010. 6.4.5 Check the equipotential connection between metal bodies and lightning protection devices at the following locations: metal pipelines entering stations and substations, other metal bodies (excluding running rails, contact rails and current collection networks flowing on non-designated circuits in the roadbed);
metal bodies on the tops of elevated stations, ground stations, depots and parking lot buildings. 6.4.6 Check the connection status, connection quality, material and size of the connecting conductor between the following parts of the electrical and electronic system and the equipotential bonding strip (or equipotential terminal board): PE bus and exposed metal conductor inside the distribution cabinet (panel); metal casing of UPS and battery cabinet; metal casing of electronic equipment: equipment rack and metal operating table; metal casing of fire-fighting facilities and other supporting facilities in the computer room; metal shielding layer of cables; shielding layer and metal reinforcement ribs of optical cables; metal wire trough; wiring rack; anti-static floor bracket; metal doors, windows, partitions, etc.
6.4.7 Check the transition resistance of the following equipment and lightning protection devices in each station section: sound barrier frame;
light pole:
camera bracket;
antenna pole;wwW.bzxz.Net
-cable rack;
signal machine:
control box;
power supply box;
signal box.
6.5 surge protector
neutral line/ground line), see Table 1 for the inspection position. Table 1 Inspection location of surge protector in low-voltage power distribution system
Building type
Control center
0.4kV low-voltage switch cabinet room
Computer room name
Communication equipment room, signal equipment room, integrated monitoring room, fire control room, UPS room, dispatching hall, etc. Communication equipment room, signal equipment room, integrated monitoring room, fire control room, etc. Special or important electronic equipment room Building type
Inspection location of surge protector in low-voltage power distribution system (continued) Table 1
Machine room name
Road depot and parking lot, mainly including train inspection depot, signal building, parking garage, maintenance depot, office building, substation, etc.
Elevated station, ground station, semi-underground station, the first underground station connected to the ground section, ground section substation, section ventilation shaft, main substation
Underground station not connected to the ground section
0.4kV low-voltage switch cabinet room or main distribution room in each unit QX/T498—2019
Communication equipment room, signal equipment room, comprehensive Special or important electronic equipment rooms such as communication equipment rooms, signal equipment rooms, integrated monitoring rooms, fire control rooms, etc. 0.4kV low-voltage switch cabinet room
Communication equipment room, signal equipment room, station control room, automatic ticket vending room, computer room, UPS room, platform door control room, escalator room, environmental control room, lighting distribution room, water pump room, etc. Lightning protection boxes or distribution boxes Communication equipment room, signal equipment room, integrated monitoring room, station control room, etc. Special or important Electronic equipment room 0.4kV low-voltage switch cabinet room
Communication equipment room, signal equipment room, station control room, automatic ticket vending room, computer room, UPS room, platform door control room, escalator room, environmental control room, lighting distribution room, water pump room, etc. Communication equipment room, signal equipment room, integrated monitoring room, station control room, etc. Special or important electronic equipment room Camera, antenna and other signal and communication equipment control box, power box, maintenance box for direct power distribution of equipment or facilities in outdoor, indoor and outdoor connecting space. Mainly including outdoor cooling tower, air conditioner outdoor unit, maintenance power box, lamps, advertising light boxes, logos, etc.; lamps, elevators, escalators, water pumps, etc. in the indoor and outdoor connecting space of the station; distribution box in the first underground section connected to the ground section, etc. 6.5.2 The inspection and testing of SPD of low-voltage power distribution system shall comply with the provisions of 6.2.1 and 7.3.1.1 in TB/T2311-2017. 6.5.3 Check and record the installation position, number of installations, model, and main performance parameters of various levels of SPDs at the following locations in the dedicated communication room and the public security communication room:
Lightning arrester unit on the wiring rack of the wired communication subsystem; interfaces of outdoor cameras and control signal lines connected in the video surveillance subsystem cabinet; interfaces of video and control signal lines in the decoder box of the entrance and exit cameras; outdoor antennas and feeders connected in the clock subsystem cabinet; output end of the audio power amplifier of the broadcast subsystem; RF port of the outdoor antenna of the wireless subsystem
6.5.4 Check the installation position and model of the lightning protection distribution cabinet of signal machines in stations, depots and parking lots. 6.5.5 The inspection and testing of SPDs for telecommunications and signal networks shall comply with the provisions of 6.2.3 and 7.3.2.1 of T3/T31-2017. Item Service
6.6 Traction Power
For overhead contact network in the above-ground section, the spacing of lightning arresters shall be less than or equal to 300m; at the station traction power disconnector at both ends of the tunnel: at the disconnector that supplies power to the above-ground contact network. 6.6.2 The first inspection shall check the setting of the overhead ground wire spark gap of the overhead contact network in the above-ground section, and the spacing shall be less than or equal to 200m. 6.6.3 Detect the impulse grounding resistance of the lightning arrester and spark gap grounding terminal, and its value shall be less than or equal to 1026.6.4 Check and record the installation position, installation quantity, model and main performance parameters of the lightning overvoltage absorption device at the DC feeder and negative bus.
QX/T498-2019
A.1 Test method for large grounding devices
A, 1.1 Current-voltage meter three-pole method: straight line method Appendix A
(Normative Appendix)
Test method for grounding devices
The current line and the potential line are laid out in the same direction (same path) is called the straight line method in the three-pole method, see Figure A.1. Laying out the line is in accordance with the requirements of A.1.3, and drG is usually 0.5 to 0.6 times dcG. The potential electrode P should be moved three times in the direction of the line connecting the grounding device G to the current electrode C under test, and the distance of each movement is about 5% of dog. If the error of the results of the three tests is within 5%, it is acceptable. A
Description:
LanZaiXingXin
Tested grounding device quantity:
Current electrode;
Potential electrode;
The distance between the potential electrode and the edge of the tested grounding device. Service
Schematic diagram of measuring grounding impedance by three-pole method of current-voltage meter A.1
A.1.2 Selection of test power supply
A.1.2.1 It is advisable to use the different-frequency current method to test the power frequency characteristic parameters of the grounding device. The test current frequency should be in the range of 40Hz to 60Hz, with a standard sine wave waveform, and the current amplitude should not be less than 3A. When the interference on the test site is large, the measured overcurrent can be increased, and special attention should be paid to the test safety.
A.1.2.2 If the power frequency current is used to test the power frequency characteristic parameters of the grounding device, an independent power supply or an isolation transformer should be used for power supply, and the test current should be increased as much as possible. The test current should not be less than 50A, and special attention should be paid to the safety issues of the test, such as the care of the current electrode and the test circuit.
A.1.3 Arrangement of the test circuit
Arrange the test circuit according to the following requirements:
QX/T498—2019
a) The current electrode for testing the power frequency characteristic parameters of the grounding device should be arranged as far as possible, as shown in Figure A.1. Usually, the distance dcc between the current electrode and the center of the grounding device under test should be 4 to 5 times the maximum diagonal length D of the grounding device under test; For the wiring of super-large grounding devices, overhead lines can be used as current lines and potential lines: When it is difficult to lay out the line over a long distance, dcc can be taken as 2D in areas with uniform soil resistivity.3D can be used in areas with uneven soil resistivity. d) The test loop should avoid rivers, lakes, and road intersections as much as possible; stay away from underground metal pipelines and operating power transmission lines as much as possible, avoid long parallel sections with them, and cross vertically when crossing with them. c) The current line and the potential line should be kept as far apart as possible to reduce the influence of mutual inductance between the current line and the potential line. Setting of current electrode and potential electrode
Set the current electrode and potential electrode according to the following requirements: a)
The grounding resistance value of the current electrode should be as small as possible to ensure that the impedance of the entire current loop is small enough and the test current output by the equipment is large enough; if the grounding resistance of the current electrode is too high, multiple current electrodes can be connected in parallel or water can be poured around it to reduce the resistance. b)
The potential electrode should be inserted into the soil tightly and not loosely for more than 20cm. Artificial grounding electrodes or iron towers of high-voltage transmission lines without lightning arresters can be used as current electrodes. c) During the test, the current line and potential line should be well insulated, the joints should be reliably connected, and they should be free from exposure and water immersion. 5. Injection of test current
The injection point of the test current should be selected in the field area with large single-phase grounding short-circuit current, and the grounding lead of the equipment with good results in the electrical continuity test, generally near the neutral point of the transformer or at the edge of the field area. The test of small grounding devices can be carried out according to the specific situation. A.1.6 Safety of the test
The current line should not be disconnected during the test, and the current line and the current pole should be guarded by a dedicated person. 2. General grounding device test method
Standard information service platform
When the area of ​​the grounding device is less than 500cn, the general grounding device test method can be used to measure the grounding impedance. The wiring diagram of the tester is shown in Figure A.2.
QX/T498—2019
Description:
Tested grounding device;
Current electrode;
Potential electrode:
The maximum diagonal length of the tested grounding device: the distance between the current electrode and the center of the tested grounding device: the distance between the potential electrode and the edge of the tested grounding device. Figure A.2 Schematic diagram of ground impedance tester wiring The instrument in Figure A.2 is a four-terminal type, and some instruments are three-terminal type, that is, C, and P2 are combined into one. The test principles and methods are the same, that is, a simple combination of the current-voltage meter three-pole method. The instrument is usually powered by a battery, and the wiring requirements refer to the three-pole method. Industry Standard Information Service Platform
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