IEC 61000-3-12:2011 pdf – Electromagnetic compatibility(EMC)- Part 3-12: Limits – Limits for harmonic currents produced by equipment connected to public low-voltage systems with input current >16 A and <=75 A perphase. Table 4 may be used with balanced three-phase equipment if any one of these conditions is met, a) The 51h and 71h harmonic currents are each less than S % of the reference current during the whole test observation period. NOTE This condition re normally fulfilled by 12 pulse pieces or equipment b) The design of the piece of equipment is such that the phase angle of the 5 harmonic current has no preferential value over time and can take any value In the whole Interval [0. 360 J. NOTE Thu condition ii normally fulfill.d by converters with fully controlled thyristor bidg.s c) The phase angle of the 5’ harmonic current related to the fundamental phase-to-neutral voltage (see 3.16) is in the range of 90 • to 150 during the whole test observation period. NOTE This condition us normally fulfilled by equipment with an uncontrolled rec1l1le bridge and capacitive futer, including a 3 % SC, 0,4 % d.c reacloc, Table 5 may be used with balanced three-phase equipment if any one of these conditions is met: d) The 5th and 7111 harmonic currents are each less than 3 % of the reference current during the whole test observation period e) The design of the piece of equipment is such that the phase angle of the 5th harmonic current has no preferential value over time and can take any value In the whole interval (0 360 9. I) The phase angle of the 5’’ harmonic current related to the fundamental phase-to-neutral voltage (see 3.16) is in the range of 150 • to 210 during the whole test observation period. NOTE This condition is normally fulfilled by a B pulse converter with a mll d c. link capacitance, operating as a load. Table 3, Table 4 or Table 5 can be applied to hybrid equipment In one of the following circumstances: a) hybrid equipment having a maximum 3l harmonic current of less than 5 % of the reference current, or b) there is provision in the construction of hybrid equipment to separate the balanced three- phase and Ihe single-phase or interphase loads for the measurement of supply currents. and when the current is being measured, the part of the equipment being measured draws the same current as under normal operating Conditions. In that case, the relevant limits shall be applied separately to the single-phase or interphase part and to the balanced three-phase part. Table 3, Table 4 or Table 5 applIes to the current of the balanced three- phase part, even If the rated current of the balanced three-phase part Is less than or equal to 16 A per phase. Table 2 applies to the current of the single-phase or Interphase part, but If the rated current of the single-phase or interphase part is less than or equal to 16 A, the manufacturer may apply the relevant limits of IEC 61000-3-2 to the single-phase or interphase part instead of the limits stated in Table 2. For verification purposes, when circumstance b) above applies, the manufacturer shall state in the product documentation the rated Current and give In the test report the measured and specified values of the Input current as defined In 4.1. for each separate load. The value of Race for this type of hybrid equipment is determined as follows: • the minimum Race value is first determined for each of the two loads, using the reference current of the considered part for the calculation of the harmonic current emissions to be compared to the limit values given in Tables 2 to 5: in case IEC 6 1000-3-2 Is applied to the single-phase or interphase part instead of Table 2 limits. the minimum R, value for this part is deemed to be equal to 33; • then, for each of the two parts. the minimum value of S5 is calculated from its minimum Race value and its rated current (see 3,11 and 3.14).