ABB Relion 650 Series Product Manual page 58

Transformer protection RET650
Version 2.2
Table 36. 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
current level in % of IBasex
Alarm level 1 and 2
Operate current
Reset level temperature
Table 37. Breaker failure protection Breaker failure protection, 3-phase activation and output 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 retrip at 0 to 2 x I
Time delay for backup trip at 0 to 2 x I
Time delay for backup trip at multi-phase start at 0
to 2 x I
set
Additional time delay for a second backup trip at 0
to 2 x I
set
Time delay for alarm for faulty circuit breaker
Minimum trip pulse duration
* Valid for product version 2.2.3 or later
58
Range or value
(30–250)% of IBase
Time constant τ = (0.10–500.00)
minutes
(50–99)% of heat content
operate value
(50–250)% of IBase
(10–95)% of heat content trip
Range or value
(5-200)% of lBase
> 95%
(2-200)% of lBase
> 95%
(5-200)% of lBase
> 95%
10 ms typically
10 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
(0.010-60.000) s
© 2017 - 2021 Hitachi Power Grids. All rights reserved
M13266-2 v9
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
M12353-1 v15
Accuracy
at I £ I
±1.0% of I
r
±1.0% of I at I > I
-
at I £ I
±1.0% of I
r
±1.0% of I at I > I
-
at I £ I
±1.0% of 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
±0.2% or ±5 ms whichever is greater
1MRK 504 172-BEN G
r
r
r
r
r
r
Hitachi Power Grids