Liquid Medium Supervision Ssiml (71) - ABB RELION 670 SERIES Applications Manual

Line distance protection

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Table of Contents

Liquid medium supervision SSIML (71)

Identification

Function description

Insulation liquid monitoring function

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.

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.

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

tTempAlarm: This is used to set the time delay for a temperature alarm indication, given

tTempLockOut: This is used to set the time delay for a temperature lockout indication,

identification

Line distance protection REL670 2.2 ANSI

1MRK 506 369-UUS -

ANSI/IEEE C37.2

device number

Application manual