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Calculating setting for Range min and Range max based on primary side values
Active power range is 1 MW to 4 MW.
First S
is to be calculated:
n
S
=√3 * VoltageTransformer
n
S
= 1.73 * 10000 V * 200 A = 3.464 MVA
n
Calculating the range settings based to S
Range min (0%)
Range max (100%) =
Calculate the Analog Output percentage for specific value:
AnalogOutput (InputValue)
For e.g. Input value 1 S
AnalogOutput( 1 Sn ) = 100% / 0.86 S
The Output current for e.g. 4...20mA type is then 17.7 mA = 4mA + 82.5% * (20mA – 4mA)
+0.3
+0.4
+0.5
IND
+0.6
+0.5
+0.8
+0.9
1
CAP
-0.9
-0.8
Pri_Line-to-Line_Rated_Voltage
:
n
=
1 MW/ 3.464 MVA = 0.29 S
4 MW/ 3.464 MVA = 1.15 S
=
100% / (Range max – Range min) * (InputValue – Range min)
:
n
* ( 1 S
n
100%
22.2%
0%
EMR-4000
* CurrentTransformer
Pri_Rated_Current
n
n
– 0.29 S
) = 82.5%
n
n
-0.9
1
+0.9
-0.8
Range min
Input Value = ECr . cos phi (±)
www.eaton.com
IM02602009E
[VAn]
+0.3
Range max
126
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