ABB ret650, Applications Manual

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13.3 Liquid medium supervision SSIML
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13.3.1 Identification
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Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Insulation liquid monitoring function SSIML - 71
13.3.2 Application
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Liquid medium supervision (SSIML) 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.
13.3.3 Setting guidelines
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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.
1MRK 504 169-UEN A
Section 13
Monitoring
Transformer protection RET650 2.2 IEC 279
Application manual