Manual Voltage Regulation - ABB RELION REX640 Technical Manual

1MRS759142 C
9.10.5.4
REX640
Technical Manual
the active operation mode must be changed automatically, that is, there is a logic
which drives these three inputs based on the status information from the circuit
breakers.
The common Local/Remote (L/R) exclusion concerns the manual raise and lower
commands of OL5ATCC, that is, it internally provides the exclusion mechanism to
prevent remote commands (from SCADA) when the protection relay is in local mode
and vice versa.

Manual voltage regulation

The manual raising and lowering commands can be given via the configuration inputs
LOWER_LOCAL and RAISE_LOCAL, via the HMI of the protection relay or via
remote commands. The active operation mode of OL5ATCC must be set to "Manual"
or "Parallel manual" and the Local/Remote control LR state monitored data of the
protection relay has to be "Local" to execute the control commands manually from
HMI or via configuration inputs. If OL5ATCC is set to "Manual" or "Parallel manual"
but the LR state is set to "OFF" or "Remote", no manual control commands can be
given.
For remote commands, the active operation mode of OL5ATCC must also be set to
"Manual" or "Parallel manual" and the LR state monitored data has to be "Remote".
The manual raising or lowering commands can be given locally either via the Manual
control parameter ("Cancel"/"Lower"/"Raise") located in the HMI menu Control/
OL5ATCC1 or via the configuration inputs LOWER_LOCAL or RAISE_LOCAL.
A raising command is given by selecting the enumeration value "Raise" and the
lowering command is given by selecting the enumeration value "Lower". An accepted
manual raising or lowering command activates the corresponding output
RAISE_OWN or LOWER_OWN to control the voltage of the own transformer.
Parallel manual voltage regulation
While in single manual mode the voltage regulator acts independently, in parallel
manual mode the voltage regulator set to "Parallel manual" acts as master and the
others follow.
The parallel manual mode is intended for maintenance work and has no permanent
settings. When the mode is set again to automatic, the voltage is stepped back to the
set value.
Followers not responding to parallel manual command are indicated at output
PAR_FAIL and the number of failed followers at monitored data FAIL_FLLW.
In parallel manual mode, the TR_STATUS monitored data indicates "Master" status
to the other parallel transformers.
Section 9
Control functions
1545