IEC 61000-3-11:2000 pdf download

IEC 61000-3-11:2000 pdf download.Electromagnetic compatibility (EMC)-Part 3-11:Limits – Limitation of voltage changes,voltage fluctuations and flicker in public low-voltage supply systems – Equipment withrated current <75 A and subject to conditional connection.
b) test the equipment in accordance with 6.3 and declare in the equipment instruction manual
that the equipment is intended for use only in premises having a service current capacity
100 A per phase, supplied from a distribution network having a nominal voltage of
400/230 V. and instruct the user to determine in consultation with the supply authority, if
necessary, that the service current capacity at the interface point is sufficient for the
equipment.
The equipment shall be clearly marked as being suitable for use only in premises having a service current capacity equal to or greater than 100 A per phase.
NOTE I In the case of option a). restrictions to connection may be imposed by the supply authority on the use of equipment it the actual system impedance at the interlace point on the users premises, Z, , exceeds Zmas.
NOTE 2 In the case of option b). a new symbol (lEG 60417-5855) is under consideration for the purpose of marking equipment.
NOTE 3 For options a) and b). if the supply capacity and/or the actual system impedance Z1 have been declared to, or measured by, the user, this Information may be used to assess the suitability of equipment without reference to the supply authority.
5 Limits
The limits shall be applicable to voltage fluctuations and flicker at the supply terminals of the equipment under test, measured or calculated according to clause 4 under test conditions described in clause 6. Tests made to prove the compliance with the limits are considered to be type tests.
The following limits apply:
— the value of the short-term flicker indicator, P5 shall not be greater than 1 .0:
— the value of the long-term flicker indicator, lt shall not be greater than 0,65:
— the value of d(t) during a voltage change shall not exceed 3,3 % for more than 500 ms;
— the relative steady-state voltage change, d, shall not exceed 3,3 %;
— the maximum relative voltage change dmax, shall not exceed:
a) 4 % without additional conditions:
b) 6 % for equipment with:
– manual switching, or
— automatic switching more frequently than twice per day and having a delayed restart (the delay being not less than a few tens of seconds) or,
— manual restart after a power supply interruption.
NOTE The cycling frequency will be further limited by the P, and P1, limit. For example: a dma, of 6 % producing a reclangular voltage change characteristic twice per hour will give a P11 of about 0,65.
c) 7 % for equipment which
— is attended whilst in use (for example: hair dryers, vacuum cleaners, kitchen equipment such as mixers, garden equipment such as lawnmowers. portable tools such as electric drills); or
— is switched on automatically, or is intended to be switched on manually, no more than twice per day and has a delayed restart (the delay being not less than a few tens of seconds) or manual restart after a power supply interruption.
In the case of equipment incorporating multiple loads, limits b) and c) shall only apply if there is delayed or manual restart after a power supply interruption: for all equipment with automatic switching which is energised immediately on restoration of supply after a power supply interruption, limits a) shall apply: for all equipment with manual switching, limits b) or C) shall apply, depending on the rate of switching.
P and P11 requirements shall not be applicable to voltage changes caused by manual switching. The limits shall not be applicable to emergency switching or emergency operations.
6 Test, measurement and evaluation procedures
An overview in the form of a flow chart showing the evaluation and test procedures used in the assessment ot equipment and the leading to connection is given in Annex B.
In the calculations described in the following subclauses the modulus values of complex impedances shall be used.
In order to evaluate equipment and determine the maximum permissible system impedance from a type test, some auxiliary quantities are necessary. These auxiliary quantities have been given suffixes to facilitate their application in formulae and calculations: see Table 1.