ABB eVM1 Installation And Service Instructions Manual page 57

14.5.6.3 Capacitor load voltage Supervision
The IED monitors the charge of the capacitors, continuously checking the voltage. During the
capacitor charging phase, when the maximum charging level is exceeded, an automatic Power
Supply shutdown is performed, to avoid damage to the capacitor.
The voltage on capacitor output (normally 80V
Supply is turned off according to the following diagram:
Voltage on capacitor
Shut-down from uC
Fig. 42
14.5.6.4 Wrong Position Auto-Trip
Wrong Position Auto-Trip is performed to reach the open position following detection of wrong
circuit-breaker state, inconsistent (both open and closed position signalled simultaneously) or
absent position indication.
An automatic CB opening is performed when either Close or Open operation is not completed (the
CB does not reach the desired position) at the maximum time Tmax of 70ms:
1 – CB remains in initial position (for Open operation only)
2 – CB reaches a wrong intermediate position
3 – CB touches the final position but bounces into a wrong intermediate position
If the Auto-trip opening command is carried out properly, the IED will be READY for another
operation.
In case the Auto-trip opening command is not completed as well, the IED:
will remain in READY in above case 1, until the Maximum unsuccessful attempts have been
carried out.
will become NOT READY in above cases 2 and 3, until the CB is put back into the correct
position manually.
Wrong Position Auto-Trip is performed if - at power-on reset (IED start-up) - the CB is in a wrong
intermediate position.
This function is always enabled, in case of Wrong Position Auto-Trip an Anomaly alarm is issued
and the No Anomaly LED on the CB HMI goes ON.
) must not exceed 90V
dc
Vth-H
90V
80V
.At this value the Power
dc
Vth-L
PS OFF
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