IEC 61000-4-29:2000 pdf download.Electromagnetic compatibility (EMC)
1 scope
The test described hereinafter applies to electrical and electronic equipment and systems. It also applies to modules or subsystems whenever the EUT (equipment under test) rated power is greater than the test generator capacity specified in clause 6.
The ripple at the d.c. input power port is not included in the scope of this part of IEC 61000. It is covered by IEC 61000-4-171)
This standard does not specify the tests to be applied to particular apparatus or systems. Its main aim is to give a general basic reference to IEC product committees. These product committees (or users and manufacturers of equipment) remain responsible for the appropriate choice of the tests and the severity level to be applied to their equipment.
2 Normative references
The following normative documents contain provisions which, through reference in this text,constitute provisions of this part of IEC 61000. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IEC 61000 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.
IEC 60050(161)， International Electrotechnical Vocabulary (IEV) 一Chapter 161: Electro-magnetic compatibility
IEC 61000-4-11， Electromagnetic compatibility (EMC) 一Part 4: Testing and measuring techniques - Section 11: Voltage dips, short interruptions and voltage variations immunity tests
4 General
The operation of electrical or electronic equipment may be affected by voltage dips, short interruptions or voltage variations of the power supply.
Voltage dips and short interruptions are mainly caused by faults in the d.c. distribution system,or by sudden large changes of load. Is also possible for two or more consecutive dips or interruptions to occur.
Faults in the d.c. distribution system may inject transient overvoltages into the distribution network; this particular phenomenon is not covered by this standard.
Voltage interruptions are primarily caused by the switching of mechanical relays when changing from one source to another (e.g. from generator set to battery).
During a short interruption, the d.c. supply network may present either a "high impedance" or "low impedance" condition. The first condition can be due to switching from one source to another; the second condition can be due to the clearing of an overload or fault condition on the supply bus. The latter can cause reverse current (negative peak inrush current) from the load.
These phenomena are random in nature and can be characterised in terms of the deviation from the rated voltage, and duration. Voltage dips and short interruptions are not always abrupt.IEC 61000-4-29 pdf download.