5.3 Service Type 2 – 3P4WY_2.5E_2V3I
Meter form 3-Phase 3-Wire WYE, 2½-Elements, 2-Voltages, 3-Currents
Use this meter form type to mathematically generate any one missing voltage phase for a 3-wire WYE 2-½ element service.
To minimize lost revenue, this meter form type may be dynamically selected to generate any one missing phase potential when detecting a dropped phase voltage of a 4-wire WYE 3-element service.
Note: Some applications may require monitoring whether the missing
voltage has returned in order to revert to Service Type 0. In such cases, be aware that
when Service Type 2 is enabled, the STATE_FLAG_PH_x_ACTIVE flags cannot be used to
detect the recovery of the missing voltage. This is because the flag references the
voltage that is mathematically generated from the two existing phases, making the status
flags unsuitable for detecting voltage recovery.
The following alternatives are available for detecting the recovery of the missing voltage:
- Enable waveform capture (at 8K or 16K source) and analyze the captured data for the relevant voltage. This may conflict with applications that utilize waveform capture at 4 kHz.
- Enable harmonics analysis and monitor the magnitude of the first (fundamental) harmonic of the voltage in question.