ABB Relion 670 series - Liquid Medium Supervision SSIML (71)

18.3 Liquid medium supervision SSIML (71)
18.3.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Insulation liquid monitoring function SSIML - 71
18.3.2 Application
Liquid medium supervision (SSIML ,71) is used for monitoring the transformers and tap
changers. When the level becomes too low compared to the required value, the operation
is blocked to minimize the risk of internal failures. Binary information based on the oil
level in the transformer and the tap changer is used as input signals to the function. In
addition to that, the function generates alarms based on received information.
18.3.3 Setting guidelines
The parameters for Liquid medium supervision SSIML can be set via local HMI or
Protection and Control Manager PCM600.
Operation: This is used to disable/enable the operation of liquid medium supervision i.e.
Off/On.
LevelAlmLimit: This is used to set the limit for a level alarm condition in the transformer.
LevelLOLimit: This is used to set the limit for a level lockout condition in the transformer.
TempAlarmLimit: This is used to set the limit for a temperature alarm condition in the
transformer.
TempLOLimit: This is used to set the limit for a temperature lockout condition in the
transformer.
tLevelAlarm: This is used to set the time delay for a level alarm indication, given in s.
tLevelLockOut: This is used to set the time delay for a level lockout indication, given in
s.
tTempAlarm: This is used to set the time delay for a temperature alarm indication, given
in s.
tTempLockOut: This is used to set the time delay for a temperature lockout indication,
given in s.
Section 18 1MRK 506 369-UUS -
Monitoring
830 Line distance protection REL670 2.2 ANSI
Application manual