Current harmonic test

 

Harmonic current test main test equipment

 

Limits:

 

Table 1 Limits of Class A equipment

 

Harmonic number n

Maximum allowable harmonic current

Odd harmonic

3

2.30

5

1.14

7

0.77

9

0.40

11

0.33

13

0.21

15≤n≤39

0.15×15/n

Even harmonic

2

1.08

4

0.43

6

0.30

8≤n≤40

0.23×8/n

(Note: The harmonics of the input current of Class B equipment should not exceed 1.5 times the value given in Table 1.)

 

Table 2 Limits for Class C equipment

 

Harmonic number n

Maximum allowable harmonic current /% indicated by the percentage of input current at the fundamental frequency

2

2

3

30×λ

5

10

7

7

9

5

11≤n≤39

3

λ is the circuit power factor.

Table 3 Limits of Class D equipment

 

Harmonic number n

Maximum allowable harmonic current per watt mA/W

Maximum allowable harmonic current A

3

3.4

2.30

5

1.9

1.14

7

1.0

0.77

9

0.5

0.40

11

0.35

0.33

13≤n≤39

3.85/n

(See Table 1)

Harmonic current test product range

 

Class A: balanced three-phase equipment;

 

Household appliances, excluding equipment listed in category D;

 

Tools, excluding portable tools;

 

Incandescent dimmer;

 

Audio equipment.

 

Devices that are not specified as Class B, C, and D are considered Class A devices.

 

Class B: portable tools;

 

Arc equipment that is not part of a dedicated device.

 

Class C: Lighting equipment.

 

Class D: The following devices with a power of no more than 600W

 

Personal computer and personal computer display;

 

Television receiver.

 

Recommendation

 

IEC61000-3-2

 

EN61000-3-2

 

GB17625.1