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ION 7500 / ION 7600 User’s Guide Interharmonic Voltage

Power Quality: ION Meters and EN50160 Technical Note Page 319

Interharmonic Voltage

Interharmonics are the entire band of frequencies between two successive integer

multiples of the fundamental. All harmonic measurements are performed as

defined in IEC 61000-4-7.

 Observation period of one week with fixed steps of 10 minutes.

 N = number of 10-minute intervals in which the supply voltage is within ±15% of

nominal.

 N

= number of intervals in which one or more of the interharmonic levels

defined in the table below are exceeded and the supply voltage is within ±15% of

nominal. Levels for interharmonic bands up to the 25th harmonic are defined in

the table below.

Apply your own compliance evaluation criteria to the interharmonic statistics

provided by the meter.

In the table below, order 2 specifies all frequencies between the fundamental and

the 2

harmonic; order 3 specifies all frequencies between the 2

harmonic and

the 3

; etc.

EN 50160 data (current observation period): The meter generates the N and

N1counts described above for each phase. These counters are reset at the

beginning of the next observation period.

EN 50160 data (previous observation period): The meter stores the N and N

counter values at the end of each observation period before these counters are

reset. These registers are also stored in a data recorder for each observation period.

Events: The meter creates a message in the Event log every time the N

counter

increases.

Odd Harmonics Even Harmonics

Not Multiples of 3 Multiples of 3 Order Threshold

Order Threshold Order Threshold Order Threshold

22%

56%172%35% 41%

7 5% 19 1.5% 9 1.5% 6…24 0.5%

11 3.5% 23 1.5% 15 0.5%

13 3% 25 1.5% 21 0.5%

1 2 ... 314 315 316 317 318 319 320 321 322 323 324 ... 371 372

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Multi-tech-systems 7500 Manual do Utilizador Página 319