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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
Bay control REC670
1MRK511232-BEN E
Pre-configured
Product version: 1.2
ABB
43