Name Values (Range) Unit Step Default Description
tResetLevelLO 0.000 - 60.000 s 0.001 0.000 Reset time delay for level lockout
tResetTempLO 0.000 - 60.000 s 0.001 0.000 Reset time delay for temperture lockout
tResetTempAlm 0.000 - 60.000 s 0.001 0.000 Reset time delay for temperture alarm
16.3.6 Operation principle
GUID-F4340B59-90D0-4EA7-9FD8-F21D425C884A v6
Liquid medium supervision SSIML (71) is used to monitor the oil level in the circuit breaker. Binary
inputs of oil level LVL_ALM, LEVEL_LO and oil level signal LEVEL are taken into account to initiate
the alarms LVL_ALM and LVL_LO. When LEVEL is less than
LevelAlmLimit
or binary signal from CB
LVL_ALM is high, then the oil level indication alarm, LVL_ALM will be initiated. Similarly, if oil level
input LEVEL is less than
LevelLOLimit
or binary signal from CB LVL_LO is high or temperature
input TEMP is above lockout level
TempLOLimit
, then the oil level indication lockout, LVL_LO will
be initiated.
There may be sudden change in oil level for a very small time, for which the function need not to
initiate any alarm. That is why two time delays
tLevelAlarm
or
tLevelLockOut
have been included. If
the oil level goes below the settings for more than these time delays, then only the corresponding
alarm LVL_ALM or lockout LVL_LO will be initiated. The SET_L_LO binary input is used for setting
the gas pressure lockout. The LVL_LO output retains the last value until it is reset by using the
binary input RESET_LO. Hysteresis type comparators have been used with the setting for relative
and absolute hysteresis. The binary input BLK_ALM can be used for blocking the alarms, and the
BLOCK input can block both alarms and the lockout indication.
Temperature of the medium is available from the input signal of temperature. The signal is
monitored to detect high temperature.
When temperature input TEMP is greater than
TempAlarmLimit
, then temperature alarm
TEMP_ALM will be initiated. Similarly, if temperature input TEMP is greater than
TempLOLimit
,
then TEMP_LO will be initiated.
There may be sudden change in temperature of the medium for a very small time, for which the
function need not to initiate any alarm. That is why two time delays
tTempAlarm
or
tTempLockOut
have been included. If the temperature goes above the settings for more than
these time delays, then only the corresponding alarm TEMP_ALM or lockout TEMP_LO will be
initiated. The SET_T_LO binary input is used for setting the temperature lockout. The TEMP_LO
output retains the last value until it is reset by using the binary input RESET_LO. Hysteresis type
comparators have been used with the setting for relative and absolute hysteresis. The binary input
BLK_ALM can be used for blocking the alarms, and the BLOCK input can block both alarms and the
lockout indication.
16.3.7 Technical data
GUID-83B0F607-D898-403A-94FD-7FE8D45C73FF v6
Table 763: SSIML(71) Technical data
Function
Range or value Accuracy
Oil alarm level 1.00-100.00 ±10.0% of set value
Oil lockout level 1.00-100.00 ±10.0% of set value
Temperature alarm level -40.00-200.00 ±2.5% of set value
Temperature lockout level -40.00-200.00 ±2.5% of set value
Table continues on next page
1MRK 502 066-UUS B Section 16
Monitoring
1047
Technical manual
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