ABB REG650 Product Manual page 45

Generator protection REG650
Product version: 1.3
Table 34. Sensitive directional residual overcurrent and power protection SDEPSDE, continued
Function
Operate time, non-directional
residual overvoltage
Reset time, non-directional
residual overvoltage
Operate time, directional
residual over current
Reset time, directional
residual over current
Critical impulse time non-
directional residual over
current
Impulse margin time non-
directional residual over
current
Table 35. Thermal overload protection, two time constants TRPTTR
Function
Base current 1 and 2
Operate time:
æ ö
2 2
-
I I
p
t ç ÷
= ×
t ln
ç 2 2 ÷
-
I I
è ø
ref
(Equation 1)
EQUATION1356 V2 EN
I = actual measured current
Ip = load current before overload
occurs
Iref = reference load current
Alarm level 1 and 2
Operate current
Reset level temperature
ABB
Range or value
45 ms typically at 0.8 to 1.5 x U
85 ms typically at 1.2 to 0.8 x U
140 ms typically at 0.5 to 2 x I
set
85 ms typically at 2 to 0.5 x I
set
35 ms typically at 0 to 2 x I
set
25 ms typically
Range or value
IBase
(30–250)% of
I = load current before overload
p
occurs
Time constant τ = (1–500)
minutes
(50–99)% of heat content trip
value
IBase
(50–250)% of
(10–95)% of heat content trip
set
set
Accuracy
± 1.0% of I
r
IEC 60255–8, ±5% + 200 ms
± 2.0% of heat content trip
± 1.0% of I
r
± 2.0% of heat content trip
1MRK 502 050-BEN B
Accuracy
45 ms typically at 0.8 to 1.5 x U
85 ms typically at 1.2 to 0.8 x U
-
-
-
-
set
set
45