MCS301 - 3ph meter Page 33 of 142
MCS301 meter - product Manual 1.25 MetCom Solutions GmbH
7.2 Measuring methods
Below the different possible measuring principles are shown:
7.2.1 Standard measuring method (vectorial method)
The standard measurement method is based on the Ferraris principle
P = P
1
+ P
2
+ P
3
Example: P1 = 40W
P2 = -25W
P3 = 50W
+P = 40 -25 + 50 = 65W
-P = 0W
7.2.2 Absolute measuring method (optional)
This theft resistant measurement records negative energy flow as positive energy flow on a
phase by phase basis. This feature can be used to determine power theft or minimize the
effects of improper meter wiring. The following equation shows how the total active power is
calculated using theft-resistant measurement.
P = |P
1
| + |P
2
| + |P
3
|
Example: P1 = 40W
P2 = -25W
P3 = 50W
+P = /40/ +/-25/ + /50/ = 115W
-P = 0W
7.2.3 Arithmetic measuring method (optional)
The meter is counting the energy of every phase dependent on the sign of the phase energy
Example: P1 = 40W
P2 = -25W
P3 = 50W
+P = 40 + 50 = 90W
-P = 25 = 25W
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