Вот она - засада, то, Angel:
STPM01 support single wire meter (SWM) operation when working with Rogowsky coil
current sensors. In SWM mode there is no available voltage information in the voltage
channel.
In order to enable the SWM mode, the STPM01 must be configured with PST values of 4 or
5, (tamper enabled-Rogowsky coils). In this way, if the BFR error is detected, STPM01
enters in SWM.