Standard number: QX/T 10.3-2019
Standard name: Surge protective devices - Part 3: Selection and application principles of surge protective
devices connected to signaling networks of electronic systems
Standard format: PDF
Release time: 2019-12-26
Implementation time: 2020-04-01
Standard size: 6.79M
Standard introduction: This part of QX/T10 specifies the protected systems and equipment, the classification, technical parameters and use conditions of SPDs, and the selection and use and installation of SPDs.
This part is applicable to electronic system signal networks connected to rated voltage AC values ​​not exceeding 1000V (r,m,s) or DC voltages not exceeding 1500V.
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.
GB/T18802.21-2016 Low voltage surge protective devices Part 21: Performance requirements and test methods for surge protective devices (SPD) for telecommunication and signaling networks (IEC61643-21:2012, IDT)
GBT21714.4-2015 Lightning protection Part 4: Electrical and electronic systems in buildings (IEC62305-42010, IDT)
GB50057-2010 Code for Lightning Protection Design of Buildings
QX/T10.1-2018 Surge Protector Part 1: Performance Requirements and Test Methods
QX/T10.2-2018 Surge Protector Part 2: Selection and Use Principles in Low-voltage Electrical Systems QX/T10 Surge Protector" is divided into four parts
Part 1: Performance Requirements and Test Methods;
Part 2: Selection and Use Principles in Low-voltage Electrical Systems
Part 3: Selection and Use Principles in Electronic System Signal Networks;
Part 4: Selection and Use Principles on the DC Side of Photovoltaic Systems
This part is the third part of QX/T10.
This part is drafted in accordance with the rules given in GB/T1.1-2009.
This part replaces QX/T10.3-2007 "Surge Protective Devices Part 3: Principles of Selection and Use in Electronic System Signal Networks
". Compared with QX/T10.3-2007, the main technical changes, except for editorial changes, are as follows:
The introduction has been deleted;
The scope has been modified (see 1, 1 of the 2007 edition);
The normative references have been modified (see 2, 2 of the 2007 edition);
The following terms and definitions have been modified: electronic system (see 3.1, 3.1 of the 2007 edition), voltage limiting component (see 3.4, 3.3 of the 2007 edition), current limiting component (see 3.5, 3.4 of the 2007 edition), rated impulse withstand voltage (see 3.6, 3.11 of the 2007 edition), insertion loss (see 3.7, 3.12 of the 2007 edition), return loss (see 3.8, 3.13 of the 2007 edition), bit error rate (see 3.9, 3.16 of the 2007 edition), longitudinal balance (see 3.10, 3.17 of the 2007 edition), near-end crosstalk (see 3.11, 3.18 of the 2007 edition), recoverable current limiting (see 3.13, 3.8 of the 2007 edition), self-recovery current limiting (see 3.14, 3.9 of the 2007 edition), etc.;
The following terms and their definitions have been added: surge protector (see 3.2), multi-purpose SPD (see 3.3), lightning protection zone (see 3.15);
The following terms and their definitions have been deleted: lightning protection level (see 3.2 of the 2007 edition), SPD with unlimited current element (see 3.5 of the 2007 edition), frequency range of SPD (see 3.14 of the 2007 edition), data transmission rate of SPD (see 3.15 of the 2007 edition), etc.
This part of QX/T 10 specifies the protected systems and equipment, the classification, technical parameters and conditions of use of SPD, and the selection and installation of SPD. This part is applicable to electronic system signal networks connected to rated voltage AC value not exceeding 1000V (rms) or DC voltage not exceeding 1500V.

ICS07.060
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Meteorological Industry Standard of the People's Republic of China
QX/T10.3—2019
Replaces QX/T10.3—2007
Surge Protective Devices
Part 3: Selection and application principles of surge protective devices connected to signaling networks of electronic systems2019-12-26Released
China Meteorological Administration
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2020-04-01Implementation
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Normative references
Terms and definitions
Protected systems and equipment
4.1. Protected electronic systems
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4.2 Tolerance characteristics of protected electronic equipment
5 SPD classification, technical parameters and use conditions 5.1 SPD classification
5.2 Basic parameters and parameters that may affect the normal operation of the system Use conditions
6 SPD selection
Lightning protection zone and SPD installation location
SPD1 selection
SPD2 (3…) selection
Multi-purpose SPD selection
SPD limit voltage and protection system compatibility 6.6
7 SPD use and installation
Single-port SPD connection wire and connection requirements
Multi-wiring Connection of terminal SPD
Protection distance I generated by oscillation and traveling wave
Influence of lightning induced overvoltage on internal system of building·Coordination between SPDs and between SPDs and protected equipment7.5
Voltage limiting components
Appendix A (informative appendix)
Voltage limiting components (box voltage components)
Voltage switching components
Appendix B (informative appendix)
Current limiting components
B.1 Current interruption components
B.2 Current reduction components
B.3 Current shunt components
Appendix C (normative appendix)
Appendix D (informative appendix) Appendix E (Informative Appendix)
Transmission characteristics related to electronic systems
Risk management
Risk identification and analysis
Risks caused by lightning strikes
D.3 Risks caused by power line faults
Appendix E (Informative Appendix)
Appendix F (Informative Appendix)
Selection and use and installation of MSPD
Coordination between SPDs and between SPDs and electronic equipment YTTKN-CJOaKA
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General requirements
Determination of UIN and IIN| |tt||YTYKA-JOGaKAN
F.3 Determine the output protection voltage and current waveform of SPD1 and compare the values ​​of SPD1 and SPD2
F.5 Verify the necessity of coordination through testing References
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QX/T10 "Surge Protector" is divided into four parts: Part 1: Performance requirements and test methods; Part 2: Selection and use principles in low-voltage electrical systems; Part 3: Selection and use principles in electronic system signal networks; Part 4: Selection and use principles on the DC side of photovoltaic systems. This part is the third part of QX/T10.
This part is drafted in accordance with the rules given in GB/T1.12009. QX/T10.3—2019
This part replaces QX/T10.3-2007 "Surge Protectors Part 3: Selection and Use Principles in Electronic System Signal Networks". Compared with QX/T10.3-2007, the main technical changes, except for editorial changes, are as follows: The introduction has been deleted;
The scope has been modified (see 1, 1 of the 2007 edition): The normative references have been modified (see 2. 2007 edition 2): - The following terms and their definitions have been modified: electronic system (see 3.1, 3.1 of the 2007 edition), voltage limiting element (see 3.4, 3.3 of the 2007 edition), current limiting element (see 3.5 , 3.4 of the 2007 edition), Rated impulse withstand voltage (see 3.6, 3.11 of the 2007 edition), Insertion loss (see 3.7, 3.12 of the 2007 edition), Return loss (see 3.8, 3.13 of the 2007 edition), Bit error rate (see 3.9. 3.16 of the 2007 edition), Longitudinal balance (see 3.10, 3.17 of the 2007 edition), Near-end crosstalk (see 3.11. 3.18 of the 2007 edition), =Restoration current limiting (see 3.13, 3.8 of the 2007 edition), self-recovery current limiting (see 3.14, 3.9 of the 2007 edition), etc.; added the following terms and their definitions: surge protector (see 3.2), multi-purpose SPD (see 3.3), lightning protection zone (see 3.15); deleted the following terms and their definitions: lightning protection level (see 3.2 of the 2007 edition), SPD without current limiting element (see 3.5 of the 2007 edition), frequency range of SPD (see 3.14 of the 2007 edition), SPD data transmission rate (see 3.15 of the 2007 edition), etc.;
Modified the relevant technical parameters of the protected electronic system (see 4.1, 4.1 of the 2007 edition); modified the corresponding relationship between the working voltage of common electronic equipment and the rated working voltage of SPD (see 4.2.3, 4.2.3 of the 2007 edition), changed the electronic equipment to signal network equipment, and changed the rated working voltage to Maximum continuous working voltage; the main technical parameters of surge protectors are modified to the classification, use conditions and main technical parameters that should be considered when selecting SPDs (see Chapter 5, Chapter 5 of the 2007 edition); the classification of SPDs is modified (see 5.1); the extended temperature range and extended humidity range are added to the use conditions part; the abnormal use conditions are modified (see 5.2, 5.2.1 of the 2007 edition); the basic working parameters of SPDs are changed to maximum continuous working voltage Uc, voltage protection level Up, impact reset (if applicable), insulation resistance, rated current (see 5.3, 5.2.2 of the 2007 edition); the parameters of SPDs that may affect network transmission performance are changed to distributed capacitance, insertion loss, return loss, longitudinal balance, near-end crosstalk (NEXT), bit error rate (BER) (see 5.3, 5.3 of the 2007 edition); the series resistance, characteristic impedance, transmission rate, frequency range (see 2 5.3 of the 2007 edition); modified the coupling mode and the examples of SPD selection according to different test methods (see Table D.1. Table 5 of the 2007 edition); changed the current waveform of the lightning S4 connected near the line from 5/300μs to 5/320μs, deleted the note that the field strength can be significantly reduced due to the increase in distance, and the coupling effect on the long-distance lightning current can be ignored; put the risk management, lightning type and damage and injury type into the chapter of SPD selection Part 1 (see 6.1. Chapter 6 of the 2007 edition);
Modified the installation requirements of SPD in the general notes of Chapter 7 (see 6.1, 7.1 of the 2007 edition); - Modified the configuration example installed at the junction of the lightning protection zone (see Figure 1, Figure 2 of the 2007 edition), including modifying some instructions YTTKN-CJOUaKA
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, added the total equipotential bonding belt (MEBB), added (D1/D2, C2/B2, C1) after the signal network SPD at the junction of each lightning protection zone, and added (ITE) after the information technology equipment; modified the example of SPD configuration at the junction of each lightning protection zone (see Figure 2, Figure 3 of the 2007 edition), modified the voltage value range of each level of protection in the 2007 edition, and deleted the definition of 0.5kV; modified the description of some components in Appendix A (see Appendix A, Appendix A of the 2007 edition); modified the description of some components in Appendix B (see Appendix B,2007 edition of Appendix B); modified the transmission characteristic parameters related to electronic systems (see Appendix C, Appendix D of the 2007 edition); modified the evaluation calculation procedure (see Appendix D, Appendix C of the 2007 edition); added the content of multi-purpose SPD (see Appendix E). This part is proposed and managed by the National Lightning Disaster Prevention Industry Standardization Technical Committee. Drafting units of this part: Heilongjiang Meteorological Disaster Prevention Technology Center, Beijing Lightning Protection Device Testing Center, Shenzhen Meteorological Service Center, Harbin Institute of Technology, Jiangsu Meteorological Disaster Prevention Technology Center, Shanghai Guantu Electric Technology Co., Ltd., Ningxia Zhongke Tianji Lightning Protection Co., Ltd.
Main drafters of this part: Lv Dongbo, Zhang Chunlong, Zhang Lihua, Qiu Zongxu, Chen Qingguo, Feng Minxue, Zhao Jun, Zang Xuyun, Gao Panliang, Li Pengfei, Zhang Jun, Jiao Xue, Wu Yunling, Dong Na The previous versions of the standard replaced by this part are: QX/T10.32007.
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1 Scope
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Surge Protector
QX/T10.3—2019
Part 3: Selection and Use Principles in Electronic System Signal Networks This part of QX/T10 specifies the protected systems and equipment, the classification, technical parameters and conditions of use of SPDs, and the selection and use and installation of SPDs.
This part applies to electronic system signal networks connected to rated voltages not exceeding 1000V (rms) for AC or 1500V for DC.
2 Normative References
The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For any undated referenced documents, the latest version (including all amendments) shall apply to this document GB/T18802.21—2016 Low voltage surge protective devices Part 21: Performance requirements and test methods for surge protective devices (SPD) for telecommunication and signalling networks (IEC61643-21:2012, IDT) GB/T21714.42015 Lightning protection Part 4: Electrical and electronic systems in buildings (IEC62305-4:2010, IDT) GB50057—2010 Code for design of lightning protection of buildings QX/T10.1—2018 Surge protective devices Part 1: Performance requirements and test methods QX/T10.2—2018 Surge protective devices Part 2: Principles for selection and use in low voltage electrical systems 3 Terms and definitions The following terms and definitions apply to this document. 3.1
electronic system
Electronic system
Systems containing sensitive electronic components, such as communication equipment, computers, control and instrumentation systems, radio systems and power electronic equipment.
[GB/T21714.4—2015, definition 3.2]3.2
Surge protective device
surge protective device; SPD
An electrical device used to limit transient overvoltages and discharge surge currents, which contains at least one non-linear element. Note: SPD has appropriate connection devices and is a complete assembly component. [QX/T10.1—2018, definition 3.1.1]
oimultiserviceSPD; MSPD
Multipurpose SPD
Surge protective device with two or more protection functions in the same housing, for example, under surge conditions, it can provide protection for power supply, telecommunications and signals, and these protections share a reference point. [GB/T18802.12—2014. Definition 3.1.42]1
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Voltage-limiting element
voltage-limitingdevice
A nonlinear element connected in parallel to the protected line. When the voltage across it does not exceed Uc, it is in a high-impedance state. When the surge voltage exceeds Uc, it provides a low-impedance path to discharge current to limit overvoltage. Note: For common voltage-limiting elements, see Appendix A. 3.5
Current-limiting element
current-limiting device
An element connected in series to limit overcurrent on the protected line. It can block or reduce the overcurrent flowing to the protected load. Note: For common current-limiting elements, see Appendix B. 3.6
Rated impulse withstand voltage
rated impulse withstand voltageUw
The impulse withstand voltage specified by the equipment manufacturer for the equipment or a part of the equipment, which represents the insulation withstand overvoltage capability of the equipment.
Note: This section only considers the withstand voltage between the live conductor and the ground [GB/T18802.12—2014. Definition 3.1.47] 3.7
insertionloss
Insertion loss
<Electronic system signal network> The ratio of the power of the system before and after the SPD is connected in the system. Note: The unit is expressed in dB (decibel).
[QX/T10.1—2018. Definition 3.1.37.1] 3.8
Return loss
returnloss
Under high-frequency working conditions, the ratio of the energy reflected by the forward wave at the SPD insertion point to the output energy. It is a parameter to measure the degree of wave impedance matching between the SPD and the protected system. AR is the modulus of the reciprocal of the reflection coefficient, measured in decibels (dB). When the impedance can be determined, A can be determined by the following formula: AR = 20lgMOD [(Z + Z) / (Z) - Z)
Where:
Characteristic impedance of the transmission line before the impedance discontinuity point, that is, the source impedance; characteristic impedance after the discontinuity point or the load impedance measured from the junction between the source and the load; MOD is the calculation of the impedance modulus, that is, the absolute value
[QX/T10.1—2018. Definition 3.1.51]
biterror ratio; BER
Bit error rate
The ratio of the number of erroneous transmission bits to the total number of transmission bits in the information transmission system per unit time. [QX/T10.1—2018, Definition 3.1.48]
longitudinalbalance
Longitudinal balance
The ratio of the common mode voltage to ground of the disturbance to the synthetic differential mode voltage of the SPD under test. Used to indicate the sensitivity to common mode interference QX/T10.12018. Definition 3.1.52
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Near-end crosstalk
near-endcrosstalk:NEXT
QX/T10.3—2019
The crosstalk in the interfered channel has a propagation direction opposite to the current propagation direction in the interfering channel. The crosstalk generated in the interfered channel usually has a port close to or overlapping with the power supply end of the interfering channel. [QX/T10.1—2018, Definition 3.1.53]
Non-resettablecurrentlimiting
non-resettablecurrentlimiting SPD with current limiting function, it only has the function of limiting current once. Current limiting components are mostly fuses, hot melt coils, etc. 3.13
resettable current limiting
Resettable current limiting
SPD with current limiting function, it has the function of manually restoring to its original state after the disturbance current disappears. [QX/T10.1—2018, definition 3.1.11]
self-resetting current limiting
SPD with current limiting function, it has the function of automatically restoring after the disturbance current disappears. The current limiting element is mostly a positive temperature coefficient (PTC) thermistor, PTC ceramic thermistor or PTC polymer thermistor. [QX/T10.1—2018. definition 3.1.12]
Lightning protection zone; LPZ is a zone that divides the electromagnetic environment of lightning. The zone interface of a lightning protection zone does not necessarily have a physical interface, such as a wall, floor or ceiling as the zone interface.
[GB50057—2010. definition 2.0.24]
4 Protected systems and equipment
4.1 Protected electronic systems
4.1.1 Analog signal systems (below 300kHz) Public Switched Telephone Network (PSTN), analog instrument control systems. 4.1.2 Digital signal systems (above 1MHz) ISDN network, xDSL network, Ethernet, token ring network, FF bus (Foundation Fieldbus), Profibus, HART, CAN network, LonWorks network.
4.1.3 Video system
Cable TV system, video surveillance system, etc. 4.1.4 Satellite communication system
Satellite communication system is generally composed of indoor units and outdoor units, and transmits television, data and other signals through satellite transponders. 4.1.5 Transmission characteristics of electronic systems
Appendix C provides information on electronic systems and their transmission characteristics. These transmission characteristics should be considered when selecting SPDs connected to these systems.
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Tolerance characteristics of protected electronic equipment
Telecommunication network rated impulse withstand voltage Uw is shown in Table 1. 4.2.1
Telecommunication network rated impulse withstand voltage
Equipment name
Information network center room
External signal line port
Information network center room
Inner signal line port
Non-information network center
Outdoor signal line port
Non-information network center
Indoor signal line port
Rated impulse withstand voltage
Test waveform
10/700μs|| tt||10/700μs
10/700ms
Compound wave
Ua:1.2/50μs
Ise:8/20jus
10/700μs
10/700μs
Compound wave
Uo.:1.2/50μs
I..:8/20μs
Only applicable to ports connected to unshielded twisted pairs longer than 500m, the "primary protection" recommended by ITU-T.K20 can be used for this portOnly applicable to ports connected to unshielded twisted pairs longer than 500m.
Only applicable to when connected to cables longer than 10m, the total output impedance of the impulse generator should be 42Q.
Only applicable to ports connected to unshielded twisted pair cables longer than 500m. The "primary protection\" recommended by ITU-T, K20 can be used for this port. Only applicable to ports connected to unshielded twisted pair cables longer than 500m. bZxz.net
Only applicable to ports connected to cables longer than 10m, the total output impedance of the impulse generator should be 420.
Note: Non-information network center means that the equipment does not operate in the information network center, such as local remote offices (stations) without protection measures, commercial areas, offices, user indoors and streets, etc. U is the open circuit voltage and I. is the short circuit current. Minimum requirements for immunity tests of I/O signal/control ports in measurement, control and laboratories See Table 2 for the test values. 4.2.2
Table 2 Minimum requirements for immunity test Test values ​​Port
1/0 signal/control
1/0 signal/control directly connected to the power supply Test item
Impulse voltage test
Impulse voltage test
Test value
Applicable to line-to-ground or long-distance lines, applicable to line-to-line.
Applicable to line-to-ground.
4.2.3 The correspondence between the rated working voltage of commonly used signal network equipment and the maximum continuous working voltage of SPD is shown in Table 3. 4
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Corresponding relationship between rated working voltage of common signal network equipment and maximum continuous working voltage of SPDReference value of communication line type
DDN/X.25/ton relay
2M digital relay
Analog telephone line
100M Ethernet
Coaxial Ethernet
RS422/485
Video line
Field control
Satellite communication intermediate frequency system
SPD classification, technical parameters and use conditions
SPD classification
Rated working voltage
<6 or 40~60
SPD maximum continuous working voltage U
18 or 80
Connected to The classification of SPDs for electronic system signal networks refers to Table 4 of QX/T10.1-2018. 5.2 Basic parameters and parameters that may affect the normal operation of the system The basic operating parameters of SPDs used to protect signal networks with voltage limiting functions, or with both voltage limiting and current limiting functions, are as follows:
Maximum continuous working voltage Uc:
Voltage protection level Up;
Impact reset; (if applicable)
Insulation resistance;
Rated current.
SPDs should meet specific requirements in the application. Certain SPD parameters will affect the transmission characteristics of the network, as follows: distributed capacitance;
Insertion loss;
Return loss;
Longitudinal balance;
Near-end crosstalk;
Bit error rate.
SPD should be tested according to the items specified in QX/T10.1-2018. When selecting SPD in the signal network of the electronic system, it should be selected according to the technical parameter values ​​that may affect the network transmission performance marked by the manufacturer on the SPD body, or on the small package or instruction manual due to the limitation of the marking area. The technical parameters that may affect the network transmission performance in different systems are shown in Table 4.
Table 4 Technical parameters of SPD that may affect network transmission performance Technical parameters
Distributed capacitance
Insertion loss
Return loss
Longitudinal balance
Near-end crosstalk
Bit error rate
Analog signal system
V (small impact)
Digital signal system
Note: "/" indicates that the item is a technical parameter of SPD that may affect network transmission performance. 5.3 Conditions of use
5.3.1 Normal conditions of use
The ambient air temperature is between -5℃ and +40℃. Video system
Satellite communication system
When the ambient temperature is +40℃, the relative humidity of the air shall not exceed 50%. Higher relative humidity can be allowed at lower temperatures, for example, the relative humidity of the air can reach 90% at 20℃. Special measures should be taken for condensation caused by temperature changes. The air pressure is between 80kPa and 106kPa.
5.3.2 Abnormal use conditions
For SPDs placed under abnormal use conditions, the manufacturer and the user can determine the conditions according to the agreement. For example, when the ambient air temperature extends to -40℃ to 70℃, the test specified in Appendix M of QX/T10.1-2018 should be carried out. 6 Selection of SPD
6.1 Evaluation
When selecting SPDs in electronic systems, the possible impact sources in the electronic systems and the ways in which these impact sources are coupled into the electronic system signal network should be analyzed first, as shown in Figure 1. The damage and loss types of the electronic systems should be determined according to the coupling mode and lightning strike type (see D.1.3 of Appendix D), and the risks of the electronic systems should be identified and evaluated. For risk management, see Appendix D. When the protected electronic system does not have the possibility of S1-S4 lightning strike types and AC interference, if the building of the electronic system does not belong to the first, second, or third class lightning protection building, and the signal cable is buried and introduced, SPDs may not be installed. Note: When the signal cable is introduced overhead, if the local annual average number of thunderstorm days is less than 25 days, SPD may not be installed. For places with high requirements for public service continuity, SPD should be used for protection. For fire and explosion places, sealed SPD should be used for protection. 6.2 Lightning protection zone and SPD installation position
In the electronic system, the SPD should be installed at the junction of the lightning protection zone as shown in Figure 1. SPD1 is installed at the junction of LPZO/1 zone (i), SPD2 is installed at the junction of LPZ1/2 zone (k), and SPD3 is installed at the junction of LPZ2/3 zone (1) (see Figure 2). Whether it is necessary to install multiple levels of SPDs should be determined based on whether the U of SPD1 can meet the impact tolerance of the protected electronic equipment and the layout of the communication cables of the electronic equipment (see 6.4).
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