GB/T 18039.4-2017: Electromagnetic compatibility -- Environment -- Compatibility levels in industrial plants for low-frequency conducted disturbances

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Scope

This Part of GB/T 18039 is concerned with conducted disturbances in the frequency range from
0 kHz to 9 kHz. It gives numerical compatibility levels for industrial and non-public power
distribution systems.
This Part is applicable to AC 50 Hz low-voltage and medium-voltage power supply systems.
Power supply systems on ships, aircraft, offshore platforms and railways are not included.
The compatibility levels specified in this Part apply at the in-plant point of coupling (IPC). At
the power input terminals of equipment receiving its supply from the above systems, the
severity levels of the disturbances can, for the most part, be taken to be the same as the levels
at the in-plant point of coupling. In some situations, this is not so, particularly in the case of a
long feeder dedicated to the supply of a particular load, or in the case of a disturbance generated
or amplified within the installation of which the equipment forms a part.
Compatibility levels are specified for electromagnetic disturbances of the types which can be
expected at any in-plant point of coupling (IPC) within industrial plants or other non-public
networks, for guidance in
a) limits to be set for disturbance emission into industrial power supply systems
(including the planning levels defined in 3.1.5);
NOTE 1 A very wide range of conditions is possible in the electromagnetic environments of
industrial and other non-public networks. These are approximated in this Part by the three
classes described in Chapter 4. However, it is the responsibility of the operator of such a
network to take account of the particular electromagnetic and economic conditions,
including equipment characteristics, in setting the above-mentioned limits.
b) the choice of immunity levels for the equipment within these systems.
The disturbance phenomena considered are:
– voltage deviations;
– voltage dips and short interruptions;
– voltage unbalance;
– power-frequency variations;
NOTE 3 Electronic converters produce characteristic harmonic orders due to their topology when
used under their rated operating conditions. Different operating conditions such as
unbalance, non-ideal commutation instants, etc. may cause other harmonic orders to be
produced.
The voltage unbalance caused by a single-phase load connected line-to-line is in practice equal
to the ratio of the load power to the network three-phase short circuit power. If no substantial
single-phase load is present, the compatibility levels of class 2 may be applied.
5.5 Temporary Power-frequency Variation
The compatibility levels of power-frequency deviations of the public network apply to
industrial plants fed from the public power supply.
For the most part, the range is within 1 Hz of the nominal frequency as stated in 4.8 of IEC
61000-2-2. Where synchronous interconnection is implemented on a continental scale, the
variation is usually very much less.
The compatibility level for the temporary variation of frequency from the nominal frequency is
 1 Hz. The steady-state deviation of frequency from the nominal frequency is much less.
NOTE 1 For some equipment the rate of change of frequency is significant.
NOTE 2 In the case of supply systems isolated from the public network, frequency variations up to
 4% are expected. The actual compatibility levels in this instance are to be agreed upon.
5.6 Harmonics
The compatibility levels for individual harmonic components of the voltage shall be understood
to relate to quasi-stationary or steady-state harmonics and are given as reference values for both
long-term effects and very short-term effects.
The long-term effects relate mainly to thermal effects on cables, transformers, motors,
capacitors, etc. They arise from harmonic levels which are sustained for periods equal to or
higher than 10 min.
With reference to long-term effects, compatibility levels for individual harmonic components
of the voltage are given in Tables 2 to 4. The corresponding compatibility levels for the total
harmonic distortion are given in Table 5.
Very short-term effects relate mainly to disturbing effects on electronic devices that may be
susceptible to harmonic levels sustained for 3 s or less. Transients are not included.
With reference to very short-term effects in class 1 and class 3, compatibility levels for
individual harmonic components of the voltage, and for total harmonic distortion, are 1.5 times
the values given in Tables 2 to 5.
In class 2, they are the values given in Tables 2 to 4 multiplied by a factor k, where k is as

Basic Data

Standard ID	GB/T 18039.4-2017 (GB/T18039.4-2017)
Description (Translated English)	Electromagnetic compatibility -- Environment -- Compatibility levels in industrial plants for low-frequency conducted disturbances
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	L06
Classification of International Standard	33.100.10; 33.100.20
Word Count Estimation	30,313
Date of Issue	2017-12-29
Date of Implementation	2018-07-01
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China