Metering Functions Of The Etus Of The 6-Series - Siemens SENTRON 3WL10 Series Manual

Description
2.4 Electronic trip unit ETU
2.4.5

Metering functions of the ETUs of the 6-series

The electronic trip units of the 6-series can be expanded with the metering functions
MF Basic or MF Advanced. These measure the voltage between the phases with internal
voltage tap - optionally on the incoming or outgoing feeder side - and can therefore calculate
and transmit values for power, energy, phase difference, etc., taking the current signals into
consideration.
● MF Basic provides many measured values in accordance with IEC 61557-12
● MF Advanced provides not only the measured values described but also many enhanced
protection functions, which are listed in Chapter Parameters of the trip units (Page 54).
Faults such as overvoltages in the power system can therefore be detected before the
contacts of the circuit breaker are closed. In this way, the ETU can also power the
metering module MF Advanced directly from the busbar itself if no auxiliary power supply
is provided via the Breaker Connect module.
Metering functions of the ETUs of the 6-series
Instantaneous values
Currents (rms value)
Ground fault current
Phase-to-phase voltage (rms value)
Phase-to-neutral voltage (rms value) V
Phase sequence
Frequency
Active power
Reactive power
Apparent power
Power factor (p.f.)
Peak factor
Counter
(recorded since installation or last reset)
Active energy
Reactive energy
Apparent energy
66
Measured values Precision
A L1, L2, L3, N
A I
g
V U12, U23, U31
U1, U2, U3
—
Hz f
kW P1, P2, P3, P
tot
kvar Q1, Q2, Q3, Q
tot
kVA S1, S2, S3, S
tot
L1, L2, L3, N
total
Measured values Precision
kWh E total
p
E drawn
p
E consumed
p
kvarh E total
q
E drawn
q
E consumed
q
kVAh E total
s
Reference standard: IEC 61557-12
1 %, class 1
2 %
0.5 %
0.5 %
—
0.2 %
2 %
2 %
2 %
2 %
—
2 %
2 %
2 %
Manual, 11/2017, L1V30499596002-01
Metering module
MF required
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Metering module
MF required
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Air circuit breaker 3WL10