Table 33. Sensitive directional residual overcurrent and power protection SDEPSDE, continued
Function Range or value Accuracy
Reset time, non-directional
residual over current
60 ms typically at 2 to 0 x I
set
-
Operate time, start function 150 ms typically at 0 to 2 x I
set
-
Reset time, start function 50 ms typically at 2 to 0 x I
set
-
Table 34. 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 (0-400)°C, (0 - 600)°F ± 1.0°C, ±2°F
Operate time:
2 2
2 2 2
ln
p
Trip Amb
p ref
ref
I I
t
T T
I I I
T
t
-
=
-
- - ×
é ù
ê ú
ê ú
ê ú
ê ú
ë û
EQUATION13000039 V2 EN (Equation 1)
T
Trip
= set operate temperature
T
Amb
= ambient temperature
T
ref
= temperature rise above ambient at I
ref
I
ref
= reference load current
I = actual measured current
I
p
= load current before overload occurs
Time constant t = (1–1000) minutes IEC 60255-8, ±5.0% or ±200 ms whichever is greater
Alarm temperature (0-200)°C, (0-400)°F ± 2.0% of heat content trip
Trip temperature (0-400)°C, (0-600)°F ± 2.0% of heat content trip
Reset level temperature (0-400)°C, (0-600)°F ± 2.0% of heat content trip
Table 35. Thermal overload protection, two time constants TRPTTR
Function
Range or value Accuracy
Base current 1 and 2 (30–250)% of
IBase
± 1.0% of I
r
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 2)
I = I
measured
I
p
= load current before overload
occurs
Time constant τ = (1–500)
minutes
IEC 60255–8, ±5% + 200 ms
Alarm level 1 and 2 (50–99)% of heat content trip
value
± 2.0% of heat content trip
Operate current (50–250)% of
IBase
± 1.0% of I
r
Reset level temperature (10–95)% of heat content trip ± 2.0% of heat content trip
1MRK511232-BEN E
Pre-configured
Product version: 1.2
ABB 43
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