ABB Relion 670 Series Product Manual page 84

Generator protection REG670
Version 2.2
Table 59. 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 60. 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 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
84
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
Range or value
(5-200)% of
> 95%
(2-200)% of
> 95%
(5-200)% of
> 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
© Copyright 2017 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
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
±0.2% or ±5 ms whichever is greater
1MRK 502 074-BEN M
r
r
r
r
r
r
Hitachi Power Grids