Explanation Of Switch Status Monitoring Function Block - ABB Relion 670 Series Technical Reference Manual

Section 5
Differential protection
5.1.8.2
130
Table 69: Treatment of primary object auxiliary contact status
Primary equipment
Normally Open Normally Closed
auxiliary contact auxiliary contact
status status
(that is, "closed" (that is, "open"
or "a" contact) or "b" contact)
open open
open closed
closed open
closed closed

Explanation of Switch status monitoring function block

Inputs
• DISABLE, when this binary input has logical value zero function works in
accordance with the selected scheme (see setting OperMode). When this
binary input has logical value one, OPEN and CLOSED outputs from the
function are unconditionally set to logical value zero. All other outputs work
as usual.
• NO, to this binary input normally open (that is, "closed" or "a" contact) of the
primary switching object shall be connected
• NC, to this binary input normally closed (that is, "OPEN" or "b" contact) of
the primary switching object shall be connected.
Outputs
• CLOSED, this binary output has logical value one when the internal logic
determines that the primary object is closed (for more information about
available logical schemes, refer to table 69)
• OPEN, this binary output has logical value one when the internal logic
determines that the primary object is open (for more info about available
logical schemes, refer to table 69)
• ALARM, this binary output has logical value one when pre-set timer set under
setting tAlarm expires and the auxiliary contacts still have illegal status (that
is, 00 or 11)
• FORCED, this binary output has logical value zero when the object status is
forced via parameter setting OperMode
Settings
• SwitchName, this setting is only a string with user definable free, descriptive
text to designate particular primary switching object in the station in order to
make easier identification of the relevant primary object in the
Status in busbar protection
when when
"Scheme 1 "Scheme 2 INX"
RADSS" is selected
is selected
closed Last position
saved
open open
closed closed
closed closed
1MRK 505 208-UEN B
Alarm facility
Alarm after Information
settable time visible on
delay local HMI
yes intermediat
e_00
no open
no closed
yes badState_1
1
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