ABB Relion 650 Series Product Manual page 39

Transformer protection RET650
Version 1.1 ANSI
Table 28. Thermal overload protection, two time constants TRPTTR (49)
Function
Base current 1 and 2
Operate time:
æ ö
2 2
-
I I
p
t ç ÷
= ×
t ln
ç ÷
2 2
-
I I
è ø
b
(Equation 1)
EQUATION1356 V1 EN-US
I = I
measured
Alarm pickup 1 and 2
Operate current
Reset level temperature
Table 29. Breaker failure protection CCRBRF (50BF)
Function
Operate phase current
Reset ratio, phase current
Operate residual current
Reset ratio, residual current
Phase current pickup for blocking of contact function
Reset ratio
Timers
Operate time for current detection
Reset time for current detection
Table 30. Pole discrepancy protection CCRPLD (52PD)
Function
Operate value, current
asymmetry level
Reset ratio
Time delay
ABB Power Grids
Range or value
(30–250)% of IBase
I = load current before
p
overload occurs
Time constant τ = (1–500)
minutes
(50–99)% of heat content trip
value
IBase
(50–250)% of
(10–95)% of heat content trip
Range or value
(0-100) %
>95%
(0.000-60.000) s
© Copyright 2011 ABB Power Grids. All rights reserved
M13266-2 v4
Accuracy
± 1.0% of I
n
IEC 60255–8, class 5 + 200 ms
± 2.0% of heat content trip
± 1.0% of I
n
± 2.0% of heat content trip
M12353-1 v5
Range or value
lBase
(5-200)% of
> 95%
lBase
(2-200)% of
> 95%
lBase
(5-200)% of
> 95%
(0.000-60.000) s
35 ms typically
10 ms maximum
M13279-1 v6
Accuracy
± 1.0% of I
n
-
± 0.5% ± 25 ms
1MRK 504 127-BUS B
Accuracy
± 1.0% of I at I £ I
n n
± 1.0% of I at I > I
n
-
± 1.0% of I at I £ I
n n
± 1.0% of I at I > I
n
-
± 1.0% of I at I £ I
n n
± 1.0% of I at I > I
n
-
± 0.5% ±10 ms
-
-
39