Operation Principle - ABB REG650 Technical Manual

1MRK 502 043-UUS B
14.14.6
14.14.7
14.15
14.15.1
Technical Manual

Operation principle

Insulation gas monitoring function SSIMG (63) is used to monitor gas pressure in the
circuit breaker. Two binary output signals are used from the circuit breaker to initiate
alarm signals, pressure below alarm level and pressure below lockout level. If the input
signal PRES_ALM is high, which indicate that the gas pressure in the circuit breaker is
below alarm level, the function initiates output signal PRES_ALM, pressure below
alarm level, after a set time delay and indicate that maintenance of the circuit breaker is
required. Similarly, if the input signal PRES_LO is high, which indicate gas pressure
in the circuit breaker is below lockout level, the function initiates output signal
PRES_LO, after a time delay. The two time delay settings, tPressureAlarm and
tPressureLO, are included in order not to initiate any alarm for short sudden changes in
the gas pressure. If the gas pressure in the circuit breaker goes below the levels for
more than the set time delays the corresponding signals, PRES_ALM, pressure below
alarm level and PRES_LO, pressure below lockout level alarm will be obtained.
The input signal BLK_ALM is used to block the two alarms and the input signal
BLOCK to block both alarms and the function.
Technical data
Table 356: SSIMG (63) Technical data
Function
Pressure alarm
Pressure lockout
Temperature alarm
Temperature lockout
Timers
Insulation liquid monitoring function SSIML (71)
Identification
Function description
Insulation liquid monitoring function
Range or value
0.00-25.00
0.00-25.00
-40.00-200.00
-40.00-200.00
(0.000-60.000) s
IEC 61850 IEC 60617
identification identification
SSIML -
Section 14
Monitoring
Accuracy
-
-
-
-
± 0.5% ± 110 ms
ANSI/IEEE C37.2
device number
71
479