OMNIGRID Connect
Kamstrup A/S · 5512-2065_A1_GB_BSI
19/33
Figure 17: Example of summation transformer 200/1 for outdoor use (Scandinavian Electric).
7.1
Data
Earth fault current (incl. maximum, minimum and average) is logged periodically. Averaging is cal-
culated on 1-second samples, and periodic logging is done every 5 minutes.
Exceeded threshold (both directions) causes additional event log entry to be created. Exceeded
threshold duration can be deduced from logs.
Data for both the above logs is transferred to OMNIA® synchronously at a specific time (i.e. not as
asynchronously alarms!).
Current is measured in “mA”.
ADC
1 kHz low level ’block’ filter
Periodic Logger
Average current in logger period.
Max./Min. current with time stamp
Event Logger
Threshold :: Current with time stamp
Data transfered to OMNIA Suite
periodically (
Conventional Data
).
1 KHz
Synchronous
Earthing
AVG
1s
Asynchronous
OMNIA Suite
OnDemand Data
.
Figure 18: Block diagram for earth fault measurement.
