3.4 CURRENT TRANSFORMER 1A / 5A AC WIRING
VERY IMPORTANT: The connection wires between the transformer and the instrument have to be as short as possible and
their section has to allow that the total resistance of the circuit multiplied by the maximum intensity (5 A), do not exceed the
power of the current transformer being used; otherwise a loss of linearity in the measurement will occur.
Example: With a 100A/ 5 Transformer of 2 VA, the maximum resistance, in order not to alterate the measurement, will have to be:
2/25= 0,08 ohms, if we subtract the value of the internal shunt that is 0,014 ohm, the result remaining will be 0,066 ohm that
divided by /2 will give 0,033 ohm maximum for each wire from the transformer to the instrument.
Description CN2
PIN 1 = COMMUN
PIN 2 = SHUNT/ 2 V
PIN 3 = 200 mA
PIN 4 = 1A / 5A
PIN 5 = 20/ 200/ 600 V
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