GB/T 24338.1-2018 PDF in English
GB/T 24338.1-2018 (GB/T24338.1-2018, GBT 24338.1-2018, GBT24338.1-2018)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 24338.1-2018 | English | 135 |
Add to Cart
|
0-9 seconds. Auto-delivery.
|
Railway applications -- Electromagnetic compatibility -- Part 1: General
| Valid |
Standards related to: GB/T 24338.1-2018
PDF Preview
GB/T 24338.1-2018: PDF in English (GBT 24338.1-2018) GB/T 24338.1-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.280
S 35
Replacing GB/T 24338.1-2009
Railway applications - Electromagnetic compatibility -
Part 1. General
(IEC 62236-1.2008, MOD)
ISSUED ON. JUNE 7, 2018
IMPLEMENTED ON. JANUARY 1, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
Introduction ... 6
1 Scope ... 8
2 Normative references ... 8
3 Terms and definitions ... 9
4 Performance criteria ... 9
5 Management of EMC ... 10
Appendix A (Informative) Characteristics of railway system ... 11
References ... 18
Foreword
GB/T 24338 “Railway applications - Electromagnetic compatibility” consists of
the following parts.
- Part 1. General;
- Part 2. Emission of the whole railway system to the outside world;
- Part 3-1. Rolling stock - Train and complete vehicle;
- Part 3-2. Rolling stock - Apparatus;
- Part 4. Emission and immunity of the signalling and telecommunications
apparatus;
- Part 5. Emission and immunity of fixed power supply apparatus and
systems.
This Part is Part 1 of GB/T 24338.
This Part is drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 24338.1-2009 “Railway applications - Electromagnetic
compatibility - Part 1. General”. As compared with GB/T 24338.1-2009, the
main technical changes are as follows.
- MODIFY the instructions that this Part shall be used in conjunction with
other parts of GB/T 24338 (SEE Chapter 1; Chapter 1 of the 2009 version);
- ADD a normative reference. GB/T 28807 (SEE Chapter 2);
- ADD the requirement that possible electromagnetic interference shall be
considered when adding auxiliary apparatus to railway system (SEE
Chapter 5);
- ADD the requirement of management of electromagnetic compatibility
between rolling stock and train detection systems (SEE Chapter 5);
- MODIFY the composition of electric traction power supply system (SEE A.5;
A.5 of the 2009 version);
- ADD a description of the manner in which the track circuit detects whether
there is a train (SEE A.7.5);
- DELETE the Appendix B “Electromagnetic compatibility management of the
interface between railway infrastructure and train” (SEE Appendix B of the
Introduction
GB/T 24338 (all parts) is used for electromagnetic compatibility management,
also specifies the limits and measurement methods for the electromagnetic
emission of the railway system as a whole to the outside world, and the limits
of electromagnetic emission, immunity level, performance criteria, and
measurement methods of railway apparatus. The electromagnetic emission
level of the apparatus is compatible with the emission limits of the whole railway
system, which is beneficial for apparatus applications in the whole railway
environment. There are different stationary emission limits set for trunk railways,
subways, and trams/trolleybuses. GB/T 24338 (all parts) is applicable to
frequencies ranging from 0 GHz~400 GHz. No tests need to be performed at
frequencies where no requirement is specified. GB/T 24338, through emission
limits and immunity level requirements, achieves electromagnetic compatibility
between the whole railway system and the outside world, as well as between
various types of apparatus in the railway system.
The compatibility between the railway system and the outside world is related
to the emission limits of railway system, which shall be set in consideration of
the measurement results. Assuming that the compatibility between the railway
system and the outside world is satisfactory after the measurements are
completed, and it is confirmed that the measurement results related to the limits
are acceptable, the rail system has satisfactory compatibility. The emission
limits and immunity level requirements do not ensure electromagnetic
compatibility between the rail system and the outside world. In exceptional
circumstances, for instance near a special location which has unusual
electromagnetic interference, the railway system may require additional
measures to be taken to ensure proper compatibility. In special circumstances,
particular care shall be taken when in proximity to special transmitting
equipment such as radio frequency transmitter, or military/medical launchers.
In particular, attention is drawn to any magnetic imaging equipment in hospitals
which may be near to urban transport. The interested parties may consult and
cooperate to achieve electromagnetic compatibility.
The emission limits and immunity levels also do not ensure that the integrated
devices of the electric apparatus in railway system meet the requirements. GB/T
24338 does not cover all possible system compositions, but applies to most
apparatus. In exceptional circumstances, for instance near a special location
which has unusual electromagnetic interference, the railway system may
require additional measures to be taken to ensure proper operation. The
resolution of this is a matter for discussion between the apparatus supplier and
the project manager, infrastructure controller or equivalent.
Railway electric apparatus can form large systems (SEE Appendix A), such as
Railway applications - Electromagnetic compatibility -
Part 1. General
1 Scope
This Part of GB/T 24338 specifies the structure and content of other parts of
GB/T 24338.
This Part specifies performance criteria which apply to the whole standard.
Chapter 5 gives information on electromagnetic compatibility management.
The use of this Part alone is insufficient to judge whether the basic requirements
of the electromagnetic compatibility specification are met. It shall be considered
in conjunction with other parts of GB/T 24338.
Appendix A gives the characteristics of a railway system which has an impact
on electromagnetic compatibility behaviour.
This Part does not include the following phenomena. nuclear electromagnetic
pulse, abnormal operating conditions, and the induction effects of direct
lightning strike.
The emission limits specified in this Part do not apply to intentional transmitters
within the railway system.
Safety considerations are not covered by this Part.
This Part does not consider the biological effects of non-ionizing radiation and
apparatus for medical assistance (e.g., pacemakers).
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the versions with the dates indicated are
applicable to this document. For the undated references, the latest version
(including all the amendments) are applicable to this document.
GB/T 4365 Electrotechnical terminology - Electromagnetic compatibility
[GB/T 4365-2003, IEC 60050(161).1990, IDT]
GB/T 17799.2 Electromagnetic compatibility - Generic standards - Immunity
for industrial environments (GB/T 17799.2-2003, IEC 61000-6-2.1999, IDT)
- Electrostatic coupling, in which an electrostatic body is discharged to a
victim circuit;
- Capacitive coupling, in which the varying voltage in one circuit produces
voltage changes in a victim circuit via mutual capacitance;
- Inductive coupling, in which a magnetic field produced by a varying current
in one circuit, links with a victim circuit, inducing a disturbance voltage via
mutual inductance;
- Conductive coupling, in which the source and victim circuits share a
common conduction path;
- Electric and magnetic radiation, in which the circuit structures act as
antennas transmitting and receiving energy.
A.3 Principal electromagnetic phenomena for immunity
A.3.1 Low frequency conduction
A.3.1.1 Slow variations of the supply voltage including dips, surges, fluctuations,
unbalance.
A.3.1.2 Harmonics and intermodulation components.
A.3.1.3 Data transfer carried on the power supply.
A.3.1.4 Power frequency variations, induced low frequency voltages and DC
component in AC networks.
A.3.2 Low frequency field
Steady/transient magnetic fields and electric fields.
A.3.3 High frequency conduction
Unidirectional and oscillatory transient physical quantities (e.g., single or
repetitive bursts) and induced currents.
A.3.4 High frequency radiation
Magnetic fields, electric fields, and radio frequency radiated waves.
A.4 Principal electromagnetic phenomena for emission
The principal electromagnetic phenomena associated with immunity are also
related to emissions, but only limit requirements are imposed on the following.
a false indication of clear track. Track circuits take many forms of frequency and
time coding to reduce the risk of false energization.
The power supply may contain voltage components at track circuit frequencies,
and the input impedance of the train shall be greater than a specified value.
This prevents the passage of currents at track circuit frequencies forming in the
rails. The traction and auxiliary apparatus of the vehicle and the substations
shall not generate currents at track circuit frequencies which exceed specified
values. In special circumstances, limits shall be considered. For the railway,
these effects are entirely internal and come in many different forms.
A.7.6 Trackside apparatus
Electric energy is used in trackside apparatus to drive motors, heating, train
pre-heating, as well as other apparatus. Although the power is relatively low,
they are close to the line and may affect other railway apparatus.
A.8 Summary of main characteristics of railways
The essential differences between railways and other large electric networks
are.
- A wide variety of power supply configurations;
- A wide variety of control systems, subsystems, and power use;
- The use of sliding contacts to convey high powers to the moving trains;
- High speed operation of the trains;
- The presence of several moving sources of noise at the same time;
- A fluctuating and difficult-to-measure current flow to and from the train,
including the passage of current via the ground;
- High-power single phase loads, which may cause imbalance in the three
phase system;
- The possibility of simultaneous generation of disturbance from several
sources of noise;
- Generation of electromagnetic noise over a wide frequency spectrum;
- The power supply interacts with the vehicles, the effect of which is
enhanced or diminished at a given frequency point.
A.9 External sources of disturbance
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
|