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Compatibility Levels for Individual Harmonic Voltages in the Low-Voltage Public Network According to IEC 61000-2-2* Not multiple of 3 Odd order h 5 7 11 13 17 19 23 25 25 Harmonic voltage (%) 6 5 35 3 2 15 15 15 13 Multiple of 3 Odd order h 3 9 15 21 21 Harmonic voltage (%) 5 15 03 02 02 Even order h 2 4 6 8 10 12 12 Harmonic voltage (%) 2 1 05 05 02 02 02
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TABLE 67
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*The THD of the supply voltage including all harmonics up to the 40th order shall be less than 8 percent
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nected to the low-voltage public network so that compliance with the limits ensures that the voltage in the public network satisfies the compatibility limits defined in IEC 61000-2-2 The IEC 61000-3-2 is an outgrowth from IEC 555-2 (EN 60555-2) The standard classifies equipment into four categories:
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Class A: Balanced three-phase equipment and all other equipment not belonging to classes B, C, and D Class B: Portable tools Class C: Lighting equipment including dimming devices Class D: Equipment having an input current with a special waveshape and an active input power of less than 600 W
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Figure 635 can be used for classifying equipment in IEC 61000-3-2 It should be noted that equipment in classes B and C and provisionally motor-driven equipment are not considered class D equipment regardless of their input current waveshapes The half-cycle waveshape of class D equipment input current should be within the envelope of the inverted T-shape shown in Fig 636 for at least 95 percent of the time The center line at /2 lines up with the peak value of the input current Ipk Maximum permissible harmonic currents for classes A, B, C, and D are given in actual amperage measured at the input current of the equipment Note that harmonic current limits for class B equipment are 150 percent of those in class A Harmonic current limits according
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Applied Harmonics Applied Harmonics 287
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Balanced three-phase equipment No
Portable tool No
Class B
Lighting equipment No
Class C
Equipment having the special waveshape and P < 600 W No
Portable tool Yes
Class D
Class D
Figure 635 Flowchart for classifying equipment according to IEC 61000-3-2
to IEC 61000-3-2 are shown in Tables 68 through 610 Note that harmonic current limits for class D equipment are specified in absolute numbers and in values relative to active power The limits only apply to equipment operating at input power up to 600 W IEC 61000-3-4 limits emissions from equipment drawing input current larger than 16 A and up to 75 A Connections of this type of equipment do not require consent from the utility Harmonic current limits based on this standard are shown in Table 611
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Applied Harmonics 288 Six
i/Ipk /3 1 /3 /3
M 035
0 0 shape for class D equipment
Figure 636 Envelope of the input current to define the special wave-
TABLE 68
Harmonic Current Limits for Class A Equipment Max permissible harmonic current order (A) 23 114 077 04 033 021 015 15/h
Odd order h 3 5 7 9 11 13 15 39
Even order h 2 4 6 8 40
Max permissible harmonic order (A) 108 043 03 023 8/h
Harmonic Current Limits for Class C Equipment Max permissible harmonic current* (%) 30 2 circuit power factor 10 7 5 3
TABLE 69
Harmonic order h 2 3 5 7 9 11 39
*Percent of the fundamental input current
685 IEC 61000-3-6
IEC 61000-3-6 specifies limits of harmonic current emission for equipment connected to medium-voltage (MV) and high-voltage (HV) supply systems In the context of the standard, MV and HV refer to voltages between 1 and 35 kV, and between 35 and 230 kV, respectively A voltDownloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
Applied Harmonics Applied Harmonics Harmonic Current Limits for Class D Equipment Max permissible harmonic current Harmonic order h 2 5 7 9 13 11 39 Per watt (mA/W) 34 19 10 050 035 386/h (A) 23 114 077 040 033 See Table 68
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