- Power Measurement Modem User's Guide

ION 7500 / ION 7600 User’s Guide Power Frequency

Power Quality: ION Meters and EN50160 Technical Note Page 303

Power Frequency Default Measurements

* This data is recorded once a week by Data Recorder module 17.

Optionally, the data below can be recorded every 10 minutes by Data Recorder 32.

Freq N*

Signal Limit Evaluation

number of valid intervals (voltage on all phases within +/- 15% of nominal)

Freq N invld* number of invalid intervals

Freq N1* number of valid intervals in which the freq deviates from the nominal by more than +/-1%

Freq N2* num of valid intervals in which the freq deviates from the nominal by more than +4% or -6%

PO Freq N

Store

Freq N of the previous Observation Period

PO Freq N1 Freq N1 of the previous Observation Period

PO Freq N2 Freq N2 of the previous Observation Period

Freq mean-ep Sliding Window Demand average Frequency over 10s (used for display purposes)

Freq mn-op Minimum minimum mean Frequency (Freq mean-ep) over 1week (used for display purposes)

Freq mx-op Maximum maximum mean Frequency (Freq mean-ep) over 1week (used for display purpose)

Freq N1/N

Arithmetic

N1/N ratio

Freq N2/N N2/N ratio

PO Freq N1/N N1/N ratio of the previous Observation Period

PO Freq N2/N N2/N ratio of the previous Observation Period

PQ Freq mean average Frequency over 10minutes

PQ Freq low minimum Frequency over 10 minutes (HS measurement)

PQ Freq high maximum Frequency over 10 minutes (HS measurement)