Siemens SENTRON 3WL10, Manual

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Description
2.4 Electronic trip unit ETU
Air circuit breaker 3WL10
66
Manual, 11/2017, L1V30499596002-01
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
Measured values Precision
Reference standard: IEC 61557-12
Metering module
MF required
Currents (rms value) A L1, L2, L3, N 1 %, class 1 —
Ground fault current A I
g
2 % —
Phase-to-phase voltage (rms value) V U12, U23, U31 0.5 % ●
Phase-to-neutral voltage (rms value) V U1, U2, U3 0.5 % ●
Phase sequence — — ●
Frequency Hz f 0.2 % ●
Active power kW P1, P2, P3, P
tot
2 % ●
Reactive power kvar Q1, Q2, Q3, Q
tot
2 % ●
Apparent power kVA S1, S2, S3, S
tot
2 % ●
Power factor (p.f.) L1, L2, L3, N 2 % ●
Peak factor total — ●
Counter
(recorded since installation or last reset)
Measured values Precision Metering module
MF required
Active energy kWh E
p
total
E
p
drawn
E
p
consumed
2 % ●
Reactive energy kvarh E
q
total
E
q
drawn
E
q
consumed
2 % ●
Apparent energy kVAh E
s
total 2 % ●