ABB Relion REL650 Series Product Manual page 62

Line distance protection REL650
Version 2.2
Table 38. 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 39. Thermal overload protection, one time constant LCPTTR/LFPTTR
Function
Reference current
Reference temperature
Operate time:


,
2 2
I I

σ
< p
t ln
,

T T
2 , Trip Amb √
I

 T
ref
EQUATION13000039 V3 EN-US
T = set operate temperature
Trip
T = ambient temperature
Amb
T = temperature rise above ambient at I
ref
I = reference load current
ref
I = actual measured current
I = load current before overload occurs
p
Alarm temperature
Operate temperature
Reset level temperature
62
Range or value
45 ms typically at 0.8 x U
to 1.5 x U
set
85 ms typically at 1.2 x U
to 0.8 x U
set
140 ms typically at 0.5 x I
to 2 x I
set
85 ms typically at 2 x I
0.5 x I
set
35 ms typically at 0 to 2 x I
25 ms typically
Range or value
(0-400)% of IBase
(0-300)°C, (0 - 600)°F
Time constant t = (1–1000)
minutes




2
I

ref

(Equation 1)
ref
(0-200)°C, (0-400)°F
(0-300)°C, (0-600)°F
(0-300)°C, (0-600)°F
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Accuracy
45 ms typically at 0.8 x U
set
85 ms typically at 1.2 x U
set
-
set
to -
set
-
set
-
M12352-1 v15
Accuracy
±1.0% of I
r
± 2.0°C, ±2.0°F
IEC 60255-149, ±5.0% or ±200 ms whichever is greater
±2.0°C
±2.0°F
±2.0°C
±2.0°F
±2.0°C
±2.0°F
1MRK 506 384-BEN H
to 1.5 x U
set set
to 0.8 x U
set set
Hitachi Power Grids