Datasheet

90E32AS ENHANCED POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
Function Description 20 April 2, 2013
3.6.5 PHASE ANGLE
Phase Angle measurement registers can be divided as below:
- phase A / phase B / phase C
- voltage / current
Altogether there are 6 phase angle registers. Refer to 5.6.3 Peak,
Frequency, Angle and Temperature Registers.
Phase Angle is measured by the time-difference between the Voltage
and Current channel of the same phase.
3.6.6 FREQUENCY
The frequency is measured basing on the zero-crossing point of volt-
age channels.
The phase A voltage signal zero-crossing will be used to compute
the frequency. If phase A is in the SAG condition, phase C will be used.
If phase C is also in SAG condition, phase B will be used.
If all the phases are in the SAG condition, Frequency will be mea-
sured based on the channels which are not in phaseLoss condition (with
the same order). If all phases are lost, the frequency will return zero.
The frequency data is not averaged (updated cycle by cycle).
Refer to 5.6.3 Peak, Frequency, Angle and Temperature Registers.
3.6.7 TEMPERATURE
Chip Junction-Temperature is measured roughly every 100 ms by on-
chip temperature sensor.
Refer to 5.6.3 Peak, Frequency, Angle and Temperature Registers.
3.6.8 PEAK VALUE
Altogether there are 6 peak value registers. Refer to 5.6.3 Peak, Fre-
quency, Angle and Temperature Registers.
Refer to 3.7.1 Instantaneous Signal Monitoring.