Apparatus Control Apc - ABB RELION RET670 Applications Manual

1MRK 504 163-UUS A
15.2
15.2.1
Transformer protection RET670 2.2 ANSI
Application manual
The threshold voltages VDeadBusEnerg and VDeadLineEnerg, have to be set to a
value greater than the value where the network is considered not to be energized. A
typical value can be 40% of the base voltages.
A disconnected line can have a considerable potential due to, for
instance, induction from a line running in parallel, or by being fed via
the extinguishing capacitors in the circuit breakers. This voltage can be
as high as 30% or more of the base line voltage.
Because the setting ranges of the threshold voltages VLiveBusEnerg/VLiveLineEnerg
and VDeadBusEnerg/VDeadLineEnerg partly overlap each other, the setting conditions
may be such that the setting of the non-energized threshold value is higher than that of
the energized threshold value. The parameters must therefore be set carefully to avoid
overlapping.
VMaxEnerg
This setting is used to block the closing when the voltage on the live side is above the
set value of VMaxEnerg.
tAutoEnerg and tManEnerg
The purpose of the timer delay settings, tAutoEnerg and tManEnerg, is to ensure that
the dead side remains de-energized and that the condition is not due to a temporary
interference. Should the conditions not persist for the specified time, the delay timer is
reset and the procedure is restarted when the conditions are fulfilled again. Circuit
breaker closing is thus not permitted until the energizing condition has remained
constant throughout the set delay setting time.

Apparatus control APC

Application
The apparatus control is a functionality for control and supervising of circuit breakers,
disconnectors, and grounding switches within a bay. Permission to operate is given
after evaluation of conditions from other functions such as interlocking, synchronism
check, operator place selection and external or internal blockings.
The complete apparatus control function is not included in this product,
and the information below is included for understanding of the
Section 15
Control
IP14560-1 v2
IP14931-1 v1
M13443-4 v13
697