energy meters

Calculation methods for energy

Last Updated by LaoRen

We got several questions related to the different recording methods for electrical energy meters. Here is the behaviour with different settings:

Vector registration method (L)
By vector method the vectors of each phase L1, L2 and L3 are summed:
- When the vector sum of energies is positive, the meter registers A+ energy.
- When the vector sum of energies is negative, the meter registers A- energy.

Example (same load in each phase)

phaseL1L2L3
loadA+A-A+

Total registration: OBIS 1.0.1.8.0 = (A+) + (A-) + (A+) = A+

Arithmetic registration method
The meter can register A+ and A- energy at the same time with the arithmetic registration method.
Example (same load in each phase)

phaseL1L2L3
loadA+A-A+

Total registration, import (forward) direction: OBIS 1.0.1.8.0 = (A+) + (A+)
Total registration, export (reverse) direction: OBIS 1.0.2.8.0 = (A-)

Absolute registration |A |

The registration of absolute active energy |A| is as follows:

Example (same load in each phase)

phaseL1L2L3
loadA+A-A+

Total registration, import direction: OBIS 1.0.1.8.0 = |A+| + |A-| + |A+|
With this settings the meter registers only forward energy.

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