ABB RELION REX640 Technical Manual page 1112

Protection functions
Timer 1
Once activated, the Timer 1 module activates the ST_OVLOD output. The operation
time depends on the overload level and
under standard characteristics is based on ANSI/IEEE 37.99 and IEC 60871-1
recommendations.
Table 1054: Standard Curve characteristics for IDMT Curve
Overload value
1.10
1.15
1.20
1.30
1.40
1.70
2.20
Operate time is based on maximum value of I_PEAK_INT_A, I_PEAK_INT_B and
I_PEAK_INT_C. From maximum value calculated , operate time between any two
consecutive points in the standard table is based on logarithmic interpolation.
The operate time can be scaled using the
output is activated if the overload situation lasts long enough to exceed the
operation time.
1112
IED operate time(s) with k =
1
43200
1800
300
60
15
1
0.120
The operate time for the operation overload stage is limited between 0.1
s to 43200 s (12 hours) if
Time multiplier . The operation time
Standard
IEC60871-1
IEC60871-1
IEC60871-1
ANSI/IEEE37.99,IEC60871-1
ANSI/IEEE37.99
ANSI/IEEE37.99
ANSI/IEEE37.99
Time multiplier setting. The OPR_OVLOD
Time multiplier is used.
1MRS759142 F
REX640
Technical Manual