ABB REQ650 - Page 67

Table 30. Sensitive directional residual overcurrent and power protection SDEPSDE, continued
Function Range or value Accuracy
Reset time, non-directional
residual overvoltage
120 ms typically at 1.2 to 0.8 x U
set
-
Operate time, directional
residual over current
260 ms typically at 0.5 to 2 x I
set
-
Reset time, directional
residual over current
170 ms typically at 2 to 0.5 x I
set
-
Critical impulse time non-
directional residual over
current
100 ms typically at 0 to 2 x I
set
20 ms typically at 0 to 10 x I
set
-
-
Impulse margin time non-
directional residual over
current
25 ms typically -
Table 31. Thermal overload protection, one time constant LCPTTR/LFPTTR
Function Range or value Accuracy
Reference current (0-400)% of IBase ± 1.0% of I
r
Reference temperature (0-300)°C, (0 - 600)°F ± 2.0°C, ±2°F
Operate time:
2 2
2 2
ln
p
b
I I
t
I I
t
æ ö
-
ç ÷
= ×
ç ÷
-
è ø
EQUATION1356 V1 EN (Equation 1)
I = actual measured current
I
p
= load current before overload
occurs
I
b
= base current, IBase
Time constant t = (0–1000) minutes IEC 60255-8, ±5% + 200 ms
Alarm temperature (0-200)°C, (0-400)°F ± 2.0°C
Trip temperature (0-300)°C, (0-600)°F ± 2.0°C
Reset level temperature (0-300)°C, (0-600)°F ± 2.0°C
Breaker protection REQ650 1MRK 505 283-BEN -
Product version: 1.2
ABB 67