Siemens SENTRON 3WA1 - Page 134

Description
2.7 Metering function (power metering function)
3WA1 air circuit breaker
132 Equipment Manual, 02/2023, 92310000002-06
With its integrated current sensors and the ETU600 electronic trip unit, the 3WA circuit
breaker constitutes a PMF-DD power metering and monitoring device according to
IEC 61557-12 for the measured variables current, voltage, active energy and active
power. Accuracy class 0.5 is achieved for the voltages, class 1 for the currents and class
2 for active energy and active power.
The integrated metering function requires no external power supply of the ETU600
electronic trip unit. A 24 V DC external auxiliary power supply is only required for
transferring the metering values via a communications module, e.g. COM190.
Measured variables and accuracy
In order to fulfill the different requirements, the 3WA circuit breaker can provide the
following measured values based on phase currents, neutral conductor current and
voltages depending on its level of functionality and the desired application package.
Application package Current
meter-
ing
ready4-
COM
PMF-I
Energy
Efficiency
PMF-II
Basic
Power
Monitor-
ing
PMF-III
Advanced
Power
Monitoring
Integral voltage tap top/bottom
--
--
✓
✓
✓
Voltage tap module VTM
--
--
✓
✓
✓
Metering function acc. to
IEC 61557-12
PMF-I
--
--
✓
✓
✓
PMF-II
--
--
--
✓
✓
PMF-III
--
--
--
--
✓
Accuracy
Class
Acc. to
manufa
cturer
Acc. to
IEC
61557-
12
Phase current I
L1
, I
L2
, I
L3
1
✓
✓
✓
✓
✓
✓
Neutral conductor current I
N
1
✓
✓
✓
✓
✓
✓
Ground-fault current I
g
with
ETU600 LSI
2
✓
--
--
--
✓
✓
Ground-fault current I
g
with
ETU600 LSIG, ETU600
LSIG Hi-Z
2
✓
✓
✓
✓
✓
✓
Temperature
--
✓
✓
✓
✓
Voltage U
LN
0.5
✓
--
--
✓
✓
✓
Voltage U
LL
0.5
✓
--
--
✓
✓
✓
Active energy E
a
2
✓
--
--
✓
✓
✓
Reactive energy E
r
2
✓
--
--
--
✓
✓
Apparent energy E
ap
2
✓
--
--
--
✓
✓
Active power P
2
✓
--
--
--
✓
✓
Reactive power Q
2
✓
--
--
--
✓
✓
Apparent power S
2
✓
--
--
--
✓
✓
Power factor PF
6
✓
--
--
--
✓
✓