M13266-2 v9
Table 59. 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:
EQUATION1356 V3 EN-US (Equation 1)
I = actual measured current
Ip = load current before
overload occurs
ITrip = steady state operate
current level in % of
IBasex
Time constant τ = (0.10–
500.00) minutes
±5.0% or ±200 ms whichever is greater
Alarm level 1 and 2 (50–99)% of heat content
operate 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
M12353-1 v15
Table 60. Breaker failure protection CCRBRF
Function Range or value Accuracy
Operate phase current (5-200)% of
lBase
±1.0% of I
r
at I £ I
r
±1.0% of I at I > I
r
Reset ratio, phase current > 95% -
Operate residual current (2-200)% of
lBase
±1.0% of I
r
at I £ I
r
±1.0% of I at I > I
r
Reset ratio, residual current > 95% -
Phase current level for blocking of contact
function
(5-200)% of
lBase
±1.0% of I
r
at I £ I
r
±1.0% of I at I > I
r
Reset ratio > 95% -
Operate time for current detection 10 ms typically -
Reset time for current detection 10 ms maximum * -
Time delay for retrip at 0 to 2 x I
set
(0.000-60.000) s ±0.2% or ±15 ms whichever is greater
Time delay for backup trip at 0 to 2 x I
set
(0.000-60.000) s ±0.2% or ±15 ms whichever is greater
Time delay for backup trip at multi-phase start
at 0 to 2 x I
set
(0.000-60.000) s ±0.2% or ±20 ms whichever is greater
Additional time delay for a second backup trip
at 0 to 2 x I
set
(0.000-60.000) s ±0.2% or ±20 ms whichever is greater
Time delay for alarm for faulty circuit breaker (0.000-60.000) s ±0.2% or ±15 ms whichever is greater
Minimum trip pulse duration (0.010-60.000) s ±0.2% or ±5 ms whichever is greater
* Valid for product version 2.2.3 or later
Generator protection REG670
1MRK 502 074-BEN M
84 Hitachi Power Grids
© Copyright 2017 Hitachi Power Grids. All rights reserved
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