ABB RELION 650 Series Product Manual page 42

Transformer protection RET650 2.1 IEC
Table 29. Thermal overload protection, two time constants TRPTTR
Function
Base current 1 and 2
Operate time:
∑ 2 2 ⌡
,
I I
p
 
< √ σ
t ln
 2 2 
,
I I
 
Trip
(Equation 1)
EQUATION1356 V3 EN-US
I = actual measured current
Ip = load current before
overload occurs
ITrip = steady state operate
IBasex
current level in % of
Alarm level 1 and 2
Operate current
Reset level temperature
Table 30. Breaker failure protection CCRBRF
Function
Operate phase current
Reset ratio, phase current
Operate residual current
Reset ratio, residual current
Phase current level for blocking of contact
function
Reset ratio
Operate time for current detection
Reset time for current detection
Time delay for re-trip at 0 to 2 x I
Time delay for back-up trip at 0 to 2 x I
Time delay for back-up trip at multi-phase
start at 0 to 2 x I
set
Additional time delay for a second back-up trip
at 0 to 2 x I
set
Time delay for alarm for faulty circuit breaker
42
M12352-1 v15 M13266-2 v9
Range or value
IBase
(30–250)% of
Time constant τ = (0.10–
500.00) minutes
(50–99)% of heat content
operate value
IBase
(50–250)% of
(10–95)% of heat content trip
M12353-1 v13
Range or value
(5-200)% of
> 95%
(2-200)% of
> 95%
(5-200)% of
> 95%
10 ms typically
15 ms maximum
(0.000-60.000) s
set
(0.000-60.000) s
set
(0.000-60.000) s
(0.000-60.000) s
(0.000-60.000) s
Accuracy
±1.0% of I
r
±5.0% or ±200 ms whichever is greater
±2.0% of heat content trip
±1.0% of I
r
±2.0% of heat content trip
Accuracy
lBase
±1.0% of I at I £ I
r
±1.0% of I at I > I
-
lBase
±1.0% of I at I £ I
r
±1.0% of I at I > I
-
lBase
±1.0% of I at I £ I
r
±1.0% of I at I > I
-
-
-
±0.2% or ±15 ms whichever is greater
±0.2% or ±15 ms whichever is greater
±0.2% or ±20 ms whichever is greater
±0.2% or ±20 ms whichever is greater
±0.2% or ±15 ms whichever is greater
1MRK 504 161-BEN C
r
r
r
r
r
r
ABB