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GB/T 18802.352-2022: Components for low-voltage surge protection - Part 352: Selection and application principles for telecommunications and signalling network surge isolation transformers (SITs)
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Components for low-voltage surge protection - Part 352: Selection and application principles for telecommunications and signalling network surge isolation transformers (SITs)
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GB/T 18802.352-2022
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Basic data | Standard ID | GB/T 18802.352-2022 (GB/T18802.352-2022) | | Description (Translated English) | Components for low-voltage surge protection - Part 352: Selection and application principles for telecommunications and signalling network surge isolation transformers (SITs) | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K30 | | Classification of International Standard | 29.240.10 | | Word Count Estimation | 21,242 | | Date of Issue | 2022-12-30 | | Date of Implementation | 2023-07-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 18802.352-2022: Components for low-voltage surge protection - Part 352: Selection and application principles for telecommunications and signalling network surge isolation transformers (SITs)
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ICS 29.240.10
CCSK40
National Standards of People's Republic of China
Low Voltage Surge Protector Components
Part 352.Surge isolation for telecommunications and signaling networks
Guidelines for the selection and use of transformers (SIT)
(IEC 61643-352.2018, IDT)
Posted on 2022-12-30
2023-07-01 implementation
State Administration for Market Regulation
Released by the National Standardization Management Committee
table of contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms, Definitions, Symbols and Abbreviations 1
3.1 Terms and Definitions 1
3.2 Symbol 2
3.3 Abbreviations 3
4 Conditions of use 4
4.1 Temperature range 4
4.2 Humidity 4
4.3 Altitude 4
4.4 Microclimate 4
5 SIT surge environment 5
5.1 SIT surge suppression 5
5.2 Common mode surge 6
5.3 Differential mode surges 6
5.3.1 Overview 6
5.3.2 Differential-mode surge effects on Ethernet transformers 7
6 choose 7
6.1 General requirements 7
6.2 Impulse withstand voltage 7
6.3 Rating of SIT 7
7 applications 8
7.1 General requirements 8
7.2 Example of SIT with live shield for surge protection of control and terminal equipment installed in two different buildings 8
7.3 Example of SIT for surge protection of substation communication equipment 8
7.4 SIT example for surge protection of transmission and switching equipment on different floors of a communication building 9
7.5 SIT example for surge protection of data center computer network 10
7.6 Example of SIT for surge protection in PoE systems 11
7.7 Example of SIT for LAN surge protection 11
Appendix A (informative) Lightning overvoltage of communication cables 13
Reference 14
Figure 1 Double winding SIT symbol 2
Figure 2 Two-winding SIT symbol with polarity indication 3
Figure 3 Double-winding SIT symbol 3 with electric shield
Figure 4 SIT symbol 3 with winding center tapped
Figure 5 SIT common mode surge environment 5
Figure 6 SIT common mode surge environment with electric shield 6
Figure 7 Transformer differential mode surge interception 7
Figure 8 Example of surge protection with SIT used to isolate two different buildings8
Figure 9 Example of SIT used for surge protection in substations 9
Figure 10 SIT is used in a communication building surge protection example 10
Figure 11 SIT used in data center surge protection example 11
Figure 12 SIT used for surge protection example of PoE system 11
Figure 13 SIT for LAN surge protection example 12
Figure A.1 Communication cable lightning overvoltage 13
Table 1 List of abbreviations4
Table 2 Classification of microclimate environment4
foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents"
drafting.
This document is part 352 of GB/T 18802.GB/T 18802 has issued the following parts.
--- Low-voltage surge protector (SPD) Part 11.Performance requirements and test methods for surge protectors for low-voltage power supply systems;
--- Low-voltage surge protective device (SPD) Part 12.Guidelines for the selection and use of surge protective devices for low-voltage power distribution systems;
--- Low-voltage surge protective device Part 21.Surge protective device (SPD) performance requirements and test methods for telecommunications and signal networks;
--- Low-voltage surge protectors Part 22.Guidelines for the selection and use of surge protectors for telecommunications and signal networks;
--- Low-voltage surge protectors Part 31.Performance requirements and test methods for surge protectors used in photovoltaic systems;
--- Low-voltage surge protectors Part 32.Guidelines for the selection and use of surge protectors for photovoltaic systems;
--- Low-voltage surge protector components Part 311.Performance requirements and test circuits for gas discharge tubes (GDT);
--- Low-voltage surge protector components Part 312.Guidelines for the selection and use of gas discharge tubes (GDT);
--- Low-voltage surge protector components Part 321.Avalanche breakdown diode (ABD) specification;
--- Low-voltage surge protector components Part 331.Specifications for metal oxide varistors (MOV);
--- Low-voltage surge protector components Part 341.Surge suppression thyristor (TSS) specification;
--- Low-voltage surge protector components Part 351.Performance requirements and
experiment method;
--- Low-voltage surge protector components Part 352.Selection and use of surge isolating transformers (SIT) for telecommunications and signal networks
Guidelines.
This document is equivalent to IEC 61643-352.2018 "Low Voltage Surge Protective Device Part 352.Surges in Telecommunications and Signaling Networks"
Guidelines for the Selection and Use of Isolation Transformers (SIT).
The following minimal editorial changes have been made to this document.
--- Added a footnote about changing some typographical errors in IEC 61643-352.2018;
--- Added a note referring to the lightning overvoltage of communication cables.
Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents.
This document is proposed by China Electrical Equipment Industry Association.
This document is under the jurisdiction of the National Standardization Technical Committee on Lightning Arresters (SAC/TC81).
This document is drafted by. Sichuan Zhongguang Lightning Protection Technology Co., Ltd., Xi'an High Voltage Apparatus Research Institute Co., Ltd., Shanghai University,
Xi'an Shendian Electric Co., Ltd., Shenzhen Techuang Technology Development Co., Ltd.
The main drafters of this document. Lei Chengyong, Huang Yong, Zhou Qibin, Xie Jin, Li Shichun, Li Yuan, Jia Dongxu, Yang Guohua, He Hengwen.
Introduction
GB/T 18802 includes performance requirements and test methods for different types of low-voltage surge protectors, components of low-voltage surge protectors and
Its selection and use guidelines are proposed to be composed of fourteen parts.
--- Part 11.Surge protective device (SPD) performance requirements and test methods for low-voltage power supply systems. The purpose is to establish the applicable
Characteristics, standard test methods for protectors for protection against the indirect and direct effects of lightning or other transient overvoltage surges
and ratings etc.
--- Part 12.Guidelines for the selection and use of surge protective devices (SPD) for low-voltage power distribution systems. The purpose is to establish the applicable connection
Selective operation and safety of SPDs with AC 50Hz~60Hz voltage not exceeding 1000V or DC voltage not exceeding 1500V
Installation position and coordination principle.
--- Part 21.Surge protective device (SPD) performance requirements and test methods for telecommunications and signal networks. The purpose is to establish the applicable
Surge protectors for the protection of telecommunication and signaling networks directly or indirectly affected by lightning or other transient overvoltages
Performance requirements and test methods.
--- Part 22.Guidelines for the selection and use of surge protectors for telecommunications and signal networks. The purpose is to establish the nominal
Selection of surge protective devices (SPD) in telecommunication and signal networks with voltage not exceeding 1000V AC effective value and 1500V DC
guidelines for selection, operation, installation and coordination.
--- Part 31.Performance requirements and test methods for surge protectors for photovoltaic systems. The purpose is to establish the applicable to lightning
Performance requirements and test methods for surge protectors for protection against surges from the indirect and direct effects or other transient overvoltages.
--- Part 32.Guidelines for the selection and use of surge protectors for photovoltaic systems. The purpose is to establish a suitable connection to the AC
Photovoltaic system SPD with side voltage effective value not exceeding 1000V (50Hz or 60Hz) and DC side voltage not exceeding 1500V
Guidelines for selection, installation and fit.
--- Part 41.Performance requirements and test methods for surge protectors for DC low-voltage power systems. The purpose is to provide protection against lightning
Establish performance requirements and test methods for surge protective devices that protect against surges connected to direct effect or other transient overvoltages.
--- Part 311.Performance requirements and test circuits for gas discharge tubes (GDT). The purpose is to establish the nominal voltage applicable to the system
Gas discharge tubes used in telecommunications, signal and low-voltage power distribution networks not exceeding AC 1000V or DC 1500V
performance requirements and test loops.
--- Part 312.Guidelines for the selection and use of gas discharge tubes (GDT). The purpose is to establish the applicable system nominal voltage does not exceed
Selection of gas discharge tubes used in telecommunications, signal and low-voltage power distribution networks with AC 1000V or DC 1500V
Guidelines for selection and use.
--- Part 321.Avalanche breakdown diode (ABD) specification. The purpose is to establish the avalanche breakdown for surge protector components
Diode Specifications.
--- Part 331.Metal oxide varistor (MOV) specification. The purpose is to establish that it is suitable for AC 1000V and below or
Used in DC 1500V and below power supply lines, communication and signal systems to protect equipment, personnel or both from high transient voltage
Test specification for metal oxide varistors subjected to voltage hazards.
--- Part 341.Surge suppression thyristor (TSS) specification. The purpose is to establish the appropriate
Specification for surge suppressor thyristors designed to divert surge currents and voltages.
--- Part 351.Performance requirements and test methods for surge isolation transformers (SIT) for telecommunications and signal networks. purpose is to
The test circuit and test method are immediately applicable to determine and verify the surge parameters of surge isolation transformers.
--- Part 352.Guidelines for the selection and use of surge isolating transformers (SIT) for telecommunications and signal networks. The purpose is to establish the appropriate
Selection, application principles and information on surge isolation transformers for telecommunications and signaling networks.
This document applies to surge isolating transformers with a rated impulse withstand voltage suitable for the surge environment expected at the place of installation. This surge protection
Components (SPC) can be used in conjunction with current bleeder components to isolate and attenuate transient voltages, and can also be used in SPDs.
This document introduces the suppression effect of surge isolation transformers in the surge environment, the requirements for selecting SIT, and lists some typical SITs.
Application example.
Low Voltage Surge Protector Components
Part 352.Surge isolation for telecommunications and signaling networks
Guidelines for the selection and use of transformers (SIT)
1 Scope
This document covers the application of surge isolating transformers (SIT), suitable for telecommunication transformers with signal voltages not greater than 400 V peak-to-peak.
These transformers have a high rated impulse withstand voltage with or without shielding between the input and output windings. SIT as a surge protection element
components to suppress forward propagation of common-mode surges. This document introduces the selection of SIT, application principles and related information. This document does not contain electronic
Power line communication transformer related content.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references
For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
this document.
IEC 61643-351 Low-voltage surge protective device components Part 351.Surge isolating transformers (SIT) for telecommunications and signaling networks
ers(SIT)]
Note. GB/T 18802.351-2019 Low-voltage surge protective device components Part 351.Performance of surge isolating transformers (SIT) for telecommunications and signal networks
Requirements and test methods (IEC 61643-351.2016, IDT)
3 Terms, Definitions, Symbols and Abbreviations
3.1 Terms and Definitions
The following terms and definitions apply to this document.
3.1.1
Isolating transformers with high impulse withstand voltage, with or without electrical shielding between input and output windings.
3.1.2
Electric shielding [body] electricscreen; ES
A barrier or enclosure that limits the penetration of electric fields.
3.1.3
Clearance
The shortest distance in air between two conductive parts.
[Source. GB /Z 16935.2-2013,3.4]
3.1.4
Creepage distance creepagedistance
The shortest distance along the surface of a solid insulating material between two conductive parts.
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