GB/T 18802.352-2022Components for low-voltage surge protection - Part 352: Selection and application principles for telecommunications and signalling network surge isolation transformers (SITs) (English PDF)

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.

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