TB/T 3074-2017 English PDF (TBT3074-2017)

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TB/T 3074-2017: Technical Specification for Protection against Lightning Electromagnetic Pulse on Railway Signaling Equipment
TB/T 3074-2017
TB
RAILWAY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 45.020
S 60
Replacing TB/T 3074-2003
Technical specification for protection against
lightning electromagnetic impulse on railway
signaling equipment
ISSUED ON. JUNE 05, 2017
IMPLEMENTED ON. JANUARY 01, 2018
Issued by. State Railway Administration
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and abbreviations ... 5 
4 Basic requirements for the lightning electromagnetic pulse protection of
signaling machine room ... 11 
5 Synthetical lightning protection of signal room ... 15 
6 Other related requirements... 28 
Appendix A (Normative) Determination of Lightning rod protection scope ... 30 
References ... 37 
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces TB/T 3074-2003 “Technical specification for protection
against lightning electromagnetic impulse on railway signaling equipment”. In
addition to editorial changes, as compared with TB/T 3074-2003, the main
technical changes of this standard are as follows.
- MODIFY various factors of the lightning hazard risk to railway signaling
equipment (SEE 5.1; chapter 4 of the 2003 version);
- MODIFY the “Principles of lightning electromagnetic pulse protection for
signaling equipment system” into “Basic requirements of lightning
electromagnetic pulse protection for signaling equipment system” (SEE
chapter 4; chapter 5 of 2003 version);
- MODIFY the division of lightning protection zone (SEE chapter 4; chapter
6 of 2003 version);
- DELETE the improvement of the lightning electromagnetic pulse of
signaling equipment (SEE chapter 6 of 2003 version);
- ADD the external protection and internal protection of the signaling
equipment room (SEE 4.3, 4.5);
- ADD specific requirements and implementation methods for external and
internal protection of signaling equipment rooms (SEE 5.4.1);
- ADD the direct-attached continuous screening requirements for electronic
equipment rooms (SEE 5.4.2.3);
- MODIFY the requirements for the installation of coordinated SPD system
(SEE 5.4.3; chapter 8 of 2003 version);
- DELETE the “Test of protection level of lightning electromagnetic pulse of
signaling equipment” (SEE chapter 9 of 2003 version);
- MODIFY grounding requirements and technical parameters (SEE 5.4.1.3,
5.4.1.4; chapter 10 of 2003 version);
- MODIFY “Division of lightning protection zones and making of conformance
earth potential connections” (SEE 4.4, Figure 2; Appendix A of 2003
version);
- ADD “Determination of the scope of lightning protection” (SEE Appendix A);
Technical specification for protection against
lightning electromagnetic impulse on railway
signaling equipment
1 Scope
This standard specifies the basic principles and protective technical
requirements for the railway signaling equipment for over-voltage and over-
current protection induced by lightning electromagnetic pulse.
This standard applies to the design, construction, manufacture and
maintenance of the integrated lightning protection system for the newly built
railway and for the reconstruction and expansion of existing railway signaling
equipment. The integrated lightning protection measures for the other electronic
equipment system can refer to this standard.
This standard does not consider the protection of the signaling equipment under
direct lightning.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
TB/T 2311 Surge protective devices for railway signal system
3 Terms and abbreviations
3.1 Terms
The following terms and definitions apply to this document.
3.1.1
Lightning electromagnetic impulse
3.1.13
Cable entrance earthing bar
A dedicated earthing bar connecting the cable steel jacket entering into the
machine room to the general earthing bar or ring grounding electrode at the
entrance.
3.1.14
Lightning equipotential bonding
To reduce the potential difference created by lightning current, a lightning
protection measure that connects the isolated conductive components
directly to the lightning protection system either directly or through a surge
protector.
3.1.15
Lightning protection device
Equipment used to limit lightning transient overvoltage AND to shunt
lightning surge currents.
3.1.16
SPD surge protective device
A lightning protection device to limit transient overvoltage AND to discharge
surge current, which contains at least one non-linear element.
Note 1. Surge protective device is also known as power protection cable,
lightning protection device, lightning protector, lightning arrester and so on.
Note 2. The surge protective device is divided into single port SPD and dual
port SPD.
3.1.17
Maximum continuous operating voltage
UC
The maximum AC voltage r.m.s. or dc voltage value that can be permanently
applied on the SPD of various protection modes.
3.1.18
3.1.23
Railway integrated earthing technology
A grounding system which connects the traction power supply, power supply,
signal and communication systems, buildings, road beds, platforms, bridges,
tunnels, sound barriers, etc., along the railway which require grounding
through the common earthing system.
3.1.24
Through-railway grounding wire
Grounding electrode laid along the railway to connect all kinds of equipment
and facilities, AND used as the auxiliary passage for the traction backflow.
3.2 Abbreviations
The following abbreviations apply to this standard.
CEEB. Cable Entrance Earthing Bar
EMC. Electro Magnetic Compatibility
ERP. Earthing Reference Point
LEMP. Lightning Electromagnetic impulse
LP. Lightning Protection
LPS. Lightning Protection System
LPZ. Lightning Protection Zone
PE. Protective Earthing
SPD. Surge Protection Device
SPM. Surge Protection Measure
a) External areas (the area outside the building in which the machine room
is directly exposed to the threat of thunder and lightning).
LPZ0. In this zone, the threat comes from an un-attenuated lightning
electromagnetic field. The system inside the machine room may suffer the
risk of all or part of the lightning surge current. LPZ0 is further divided into
the following two categories.
LPZ0A. Direct lightning non-protection zone, it is the space that can
withstand the direct lightning and the entire lightning electromagnetic field,
the internal system may suffer all the lightning surge current hazards.
LPZ0B. Direct lightning protection zone, it is a space that protects the direct
lightning BUT still can suffer all the lightning electromagnetic field. Internal
systems may suffer the hazards of some lightning surge currents.
b) Internal area (the area inside the building in which the machine room is
not directly exposed to the threat of thunder and lightning), there may be
multi-layer zoning.
LPZ1. The lightning surge current in this zone is limited by the on-boundary
shunt and SPD. Space shielding can attenuate lightning electromagnetic
field.
LPZ2 ... n. The lightning surge in the circuit is further shunted at the
boundary and limited by ...