ABB REM 610, Product Manual

Page: 21 / 36

Table 22. Three-phase instantaneous or definite time short circuit protection (I>>)
Feature Value
Set start value, I>>
• At definite-time characteristic 0.50...20.0 x I
n
Start time, typical 50 ms
Time/current characteristic
• Definite time operate time, t> 0.05...30.0 s
Resetting time, typical/maximum 40/50 ms
Retardation time 30 ms
Drop-off/pick-up ratio, typical 0.96
Operate time accuracy at definite-time
characteristic ±2% of the set operate time or ±25 ms
Operation accuracy ±3% of the set start value
Table 23. Definite-time undercurrent (loss-of-load) protection (I<)
Feature Value
Set start value, I<
• At definite-time characteristic 30...80% I
n
Start time, typical 300 ms
Time/current characteristic
• Definite time operate time, t< 2...600 s
Resetting time, typical/maximum 300/350 ms
Drop-off/pick-up ratio, typical 1.1
Inhibitation of I< <12% I
n
Operate time accuracy at
• Definite-time characteristic ±3% of the set operate time or 100 ms
Operation accuracy ±3% of the set start value or +0.5% I
n
Motor Protection 1MRS756304 C
REM610
Product version: C
Issued: 30.10.2009
ABB 21