ABB RER620, Technical Manual

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1MAC309294-MB F
Section 5
Control functions
RER620 343
Technical Manual
In the sectionalizer and midpoint mode, if the setting Reset on power up is set as "TRUE",
then after any re-initialization activity in the relay like power off-and-on, software reset,
committing to a setting change etc., the loop control will be in reset or active state and
RESET_OUT output will be FALSE. If the setting Reset on power up is set as "FALSE",
then after any re-initialization activity in the relay, the loop control will be in non-reset or
in-active state and RESET_OUT output will be TRUE. In the later case, to arm the loop
control, RESET_IN input is triggered with a positive pulse. The loop control goes into
non–reset state if LCM_TRIP output is activated in sectionalizer mode or
SET_GROUP_CHANGE output is activated in mid-point mode. After restoring the line,
the loop control is reset by providing a positive pulse through RESET_IN input.
In the tie-point mode, after the power on and power off of relay, the loop control will
always go into non–reset mode due to safety reasons. The loop control can be moved to
active state by providing a positive pulse at RESET_IN input. The loop control goes into
non–reset state if LCM_CLOSE output is activated. After restoring the line, the loop
control is reset by providing a positive pulse through RESET_IN input.
The RESET_OUT indicates whether the loop control is in reset or non-reset state. If
RESET_OUT is TRUE it indicated the loop control is in non reset state and vice versa.
Table 312: Reset Logic
The sectionalizing reset setting provides automation on the reset logic in sectionalizing
mode. If sectionalizing reset is TRUE then if the loop control is in non reset mode and if
the bus voltage is above live bus threshold for live bus time then the loop control will go
into reset mode automatically. This feature is only applicable in sectionalizing recloser
mode.
5.4.5 Application
The loop control scheme is implemented to improve the circuit reliability and to provide
more effective system operation. The loop control function is used in implementing the
loop control schemes.
DLCM setting
DLCM state
before
re-initialization of
relay
DLCM function state after re-Initialization of relay
Sectionalizing mode Midpoint mode Tie point mode
“Reset on power
up” =TRUE
NOT RESET DLCM function is
reset/armed/activated &
“RESET_OUT” output is
FALSE. This is irrespective
of the previous state
before Re-initialization.
DLCM function is
reset/armed/activated &
“RESET_OUT” output is
FALSE. This is irrespective
of the previous state before
Re-initialization.
DLCM function is always non-
reset/in-active and “RESET_OUT” output
will be TRUE for safety reasons.
To activate the function, RESET_IN input
is triggered with a positive pulse or
through LHMI “Loop Scheme Reset”
button
RESET
“Reset on power
up” =FALSE
NOT RESET DLCM function is non-
reset/in-active and
“RESET_OUT” output will
be TRUE. To activate the
function, RESET_IN input
is triggered with a positive
pulse or through LHMI
“Loop Scheme Reset”
button
DLCM function is non-
reset/in-active and
“RESET_OUT” output will
be TRUE. To activate the
function, RESET_IN input
is triggered with a positive
pulse or through LHMI
“Loop Scheme Reset”
button
DLCM function is always non-
reset/in-active and “RESET_OUT” output
will be TRUE for safety reasons.
To activate the function, RESET_IN input
is triggered with a positive pulse or
through LHMI “Loop Scheme Reset”
button
RESET