Rockwell Automation 865 Differential Protection Relay - Manual (Page 177)

Technical Data 10-7
865-UM001A-EN-P – July 2009
Table 10.19 –Thermal overload stage T> (49)
Setting range: 0.1 – 2.40 x I
mot
or I
N
(step 0.01)
Alarm setting range: 60 – 99 % (step 1%)
Time constant Tau: 2 – 180 min (step 1)
Cooling time coefficient: 1.0 – 10.0 xTau (step 0.1)
Max. overload at +40 °C 70 – 120 %I
mot
(step 1)
Max. overload at +70 °C 50 – 100 %I
mot
(step 1)
Ambient temperature -55 – 125 °C (step 1°)
Resetting ratio (Start & trip) 0.95
Accuracy:
- operating time
±5% or ±1 s
Table 10.20 – Unbalance stage I 2 >, I’ 2 > (46)
Setting range: 2 – 70% (step 1%)
Definite time characteristic:
- operating time 1.0 – 600.0s s (step 0.1)
Inverse time characteristic:
- 1 characteristic curve
- time multiplier K
1
- Upper limit for inverse time
Inv
1 – 50 s (step 1)
1 000 s
Start time Typically 300 ms
Reset time <450 ms
Reset ratio 0.95
Inaccuracy:
- Starting
- Operate time
±3% of the set value or 0.5% of the rated value
±5% or ±150 ms