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Adding notes about mulit-phase applications. (#2151)

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Jon Little 2022-08-15 23:08:09 -05:00 committed by GitHub
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components/sensor/atm90e32.rst
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@ -138,7 +138,7 @@ Here are common current calibrations for the **Expandable 6 Channel Energy Meter
- 20A/25mA SCT-006: 11131
- 30A/1V SCT-013-030: 8650
- 50A/1V SCT-013-050: 15420
- 80A/26.6mA SCT-010: 41996
- 80A/26.6mA SCT-010: 41996 (note this will saturate at 2^16/10^3 amps)
- 100A/50ma SCT-013-000: 27961
- 120A/40mA: SCT-016: 41880
@ -172,6 +172,28 @@ a time-series-database, e.g. InfluxDB.
id: ct1RAWattHours
state_topic: ${disp_name}/ct1/reverse_active_energy
If the power, power_factor, reactive_power, forward_active_energy, or reverse_active_energy configuraion variables
are used, care must be taken to ensure that the line ATM90E32's voltage is from is the same phase as the current
transformer is installed on. This is significant in split-phase or multi phase installations. On a house with 240
split-phase wiring (very common in the US), one simple test is to reverse the orentation of the current transformer
on a line. If the power factor doesn't change sign, it is likely that the voltage fed to the ATM90E32 is from the other
phase.
The CircuitSetup Expandable 6 channel board can easilly handle this situation by cutting the jumpers JP12/13 to
allow a seperate VA2 to be input on the J3 pads. Make sure that current taps connected to CT 1-3 are on the phase
from which VA is fed (the barrel jack) and the taps connected to CT3-6 are on the phase from which VA2 is fed. See
the CicuitSetup repo for more details on this.
If a mulit board stack is being used, remember to cut JP12/13 on all boards and to feed VA2 to each board. VA is
fed to all boards through the stacking headers. Another detail is that each voltage transformer needs to have the
same polarity; getting this backwards will be just like having it on the wrong phase.
Note that the current measurement is the RMS value so is always positive. They only way to determine directon is to
look at the power factor. If there are only largly resistive loads and no power sources, (PF almost 1), it is simpler
to just create a template sensor that computes power from Irms*Vrms and ignore all these details. On the other
hand, one might be surprised how reactive some loads are and the CirciuitSetup designs are able to
handle these situations well.
Additional Examples
-------------------