Delivery substations

Why use high 0,2s accuracy class measurement sensors in delivery substations?

Current transformers are the first link in the metering chain and play a decisive role in ensuring overall measurement accuracy.
A high 0.2s measurement accuracy is recommended for metering functions in delivery substations because they enable metering of all energy consumption, even for low loads.
For 80% of the year, the subscriber's consumption is less than the contracted level of power rating on which the prices are based.
These high precision sensors also enable a precise analysis of subscriber consumption and facilitate fraud detection (reduction of non-technical losses).
SOCOMEC has always promoted the benefits of fuse-based protection for both personal and equipment safety. Particularly suitable for public distribution networks, fuse-based protection offers real advantages over the circuit breaker.

0.2s accuracy class

Tomorrow, with the development of Smart Grids and Smart Cities, they will be the ideal complement to new smart meters that require greater accuracy.
The 0.2s accuracy class means that the measurement has an error rate of 0.2% over a range of 20 to 120% of the nominal rating (In) and a specific accuracy above 1% In (IEC 61869-2).
Key advantages of 0,2s sensors :

• Low-load metering
• Precise analysis of patterns of consumption
• The ideal addition to smart meters


Accuracy graph for CT

Accuracy class Ratio error ± %
(% of rated value)
1 5 20 100 120
0,2s 0,75 0,35 0,2 0,2 0,2
0,2 .. 0,75 0,35 0,2 0,2


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