OMNIGRID Connect
Kamstrup A/S · 5512-2065_A1_GB_BSI
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7.
Earth fault measurement (OMNIGRID Connect built-in)
Detection of earth fault current in solidly earthed (low resistance) net types is realized using exter-
nal summation transformer. The resulting current is measured using the OMNIGRID Connect ana-
logue input terminal block.
OMNIGRID Connect
Analogue
Figure 16: Earth fault current measurement in TT net using OMNIGRID Connect.
The OMNIGRID Connect can measure up to 2 A currents using a low-level sampling rate of 1 kHz.
Measured data is filtered using block mean calculation transforming data into 1-second samples.
Note
The majority of summation transformers is magnetic saturated delivering a maximum
current well below 2A.
Key parameters:
•
Designed for current in the range: 0 – 2 A
•
Summation transformer type:
200/1
•
Cable length:
< 8 m
•
Galvanic isolation:
No
•
Terminal block:
+A / -A