16
16
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.
CN2
1 2 3 4 5
I
N
L
Ammeter with Transformer
1 A or 5 A
PIN 1 = COMMON
PIN 2 = SHUNT/ 2 V
PIN 3 = 200 mA
PIN 4 = 1A /5A
PIN 5 = 20/ 200/ 600 V
Description CN2
R1
R2
Read recommendations
page 10
3.3 200 mA INPUT WIRING
CN2
1 2 3 4 5
I
N
L
Ammeter 200 mA
DC/ AC
Read recommendations
page 10
PIN 1 = COMMON
PIN 2 = SHUNT/ 2 V
PIN 3 = 200 mA
PIN 4 = 1A /5A
PIN 5 = 20/ 200/ 600 V
Description CN2
