Hitachi Relion 650 Series Technical Manual page 77

1MRK 511 557-UEN Rev. A
electrical scatter of switching times. Furthermore, it optimizes the targeting accuracy by
compensating the dependency of mechanical operating times on ambient parameters such as control
voltage, temperature, drive pressure, and by adaptively correcting the CB release instants based on
the target errors in the last operation.
SSCPOW provides the core functionality of controlled switching, which is to generate synchronized
closing and opening commands to the three poles of the circuit breaker based on information from
other functions.
IEC19000896 V1 EN-US
Figure 35:
Figure 35
closing and/or opening of a circuit breaker connected to a 3-phase AC source and to a load. The IED
determines optimal switching instants based on the user defined settings and thus issues close/open
commands to the CB.
Technical Manual
3phase AC supply
A
V
IED
Application of a controlled switching device (POW controller, IED)
displays a general application of a controlled switching device where the IED controls the
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Circuit Breaker
Close/Open
commands
IEC19000896=IEC19000896=1
Load
=en-us=Original.vsdx
Section 9
Control
71