sepam 20 user manual - Schneider Electric

2
Metering functions Phase-to-phase voltage
Phase-to-neutral voltage
2/6
Phase-to-phase voltage
Operation
This function gives the RMS value of the 50 or 60 Hz component of phase-to-phase
voltages (according to voltage sensor connections):
b U21: voltage between phases 2 and 1
b U32: voltage between phases 3 and 2
b U13: voltage between phases 1 and 3.
It is based on measurement of the fundamental component.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the key
b the display of a PC with the SFT2841 software
b the communication link
b an analog converter with the MSA141 option.
Characteristics
Measurement range 0.05 to 1.2 Unp (1)
Unit V or kV
Accuracy (2) ±1 % from 0.5 to 1.2 Unp
±2 % from 0,05 to 0.5 Unp
Display format 3 significant digits
Resolution 1 V or 1 digit
Refresh interval 1 second (typical)
(1) Un nominal rating set in the general settings.
(2) at Un, in reference conditions (IEC 60255-6).
Phase-to-neutral voltage
Operation
This function gives the RMS value of the 50 or 60 Hz component of phase-to-neutral
voltages:
b V1: phase 1 phase-to-neutral voltage
b V2: phase 2 phase-to-neutral voltage
b V3: phase 3 phase-to-neutral voltage.
It is based on measurement of the fundamental component.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the key
b the display of a PC with the SFT2841 software
b the communication link
b an analog converter with the MSA141 option.
Characteristics
Measurement range 0.05 to 1.2 Vnp (1)
Unit V or kV
Accuracy (2) ±1 % from 0.5 to 1.2 Vnp
±2 % from 0.05 to 0.5 Vnp
Display format 3 significant digits
Resolution 1 V or 1 digit
Refresh interval 1 second (typical)
(1) Vnp: primary rated phase-to-neutral voltage (Vnp = Unp/3).
(2) at Vnp in reference conditions (IEC 60255-6).
PCRED301005EN - 06/2008