Feeder Terminal REF 542plus
1MRS756269
Technical data (cont´d)
14
Motor protection functions
49 Thermal overload protection with
total memory
Nominal temperature = 50 - 400°C (nominal
temperature at I
n
)
Nominal current (I
Mn
) = 0.100 - 5.000 x I
n
(primary
value of the nominal motor
current)
Initial temperature = 10 - 400°C
Time constant at I <0.1 x I
Mn
= 10 - 100 000 s
Time constant at 0.1 x I
Mn
< I <2 x I
Mn
= 10 - 20 000 s
Time constant at I >2 x I
Mn
= 10 - 20 000 s
Trip Temperature = 50 - 400°C
Warning temperature = 50 - 400°C
Environmental temperature = 10 - 50°C
Reset temperature = 10 - 400°C
51 MS Motor start I
Mn
= 0.200 - 2.000 x I
Mn
(motor current)
I
s
= 1.000 - 20.000 x I
Mn
(start value)
t = 40 - 30 000 ms
I> = 0.200 - 0.800 x Is (motor start)
51 LR Locked rotor (definite time
characteristic)
I
Mn
= 0.200 - 2.000 x I
n
(motor current)
I
s
= 1.000 - 20.000 x I
Mn
(start value)
t = 40 - 30 000 ms
66 Number of starts n (warm) = 1 -10 (number of warm starts)
n (cold) = 1 -10 (number of cold starts)
t = 1.00 - 7200.00 s
T (warm) = 20 - 200°C (warm start temperature
thereshold)
46 Unbalance load I
s
= 0.05 - 0.30 x I
n
(start value of the negative phase
sequence)
K = 0.5 - 30.0
t
Reset
= 0 - 2000 s
Timer decreasing rate = 0 - 100%
37 Low load P
n
= 50 - 100 000 kW (primary values)
Minimal load P = 5 - 00% x P
n
Minimal current I = 2 - 20 % x I
n
Operation time = 1.0 - 1000.0 s
Differential protection functions
87 Differential Differential
Transformer group = 0 - 11
Transformer earthing = primary and or secondary side
Primary nominal current = 10.00 - 100 000.00 A (prim
value)
Secondary nominal current = 10.00 - 100 000.00 A
(prim value)
Threshold current = 0.10 - 0.50 x I
r
(p.u.)
Unbiased region limit = 0.50 - 5.00 x I
r
(p.u.)
Slightly biased region threshold = 0.20 - 2.00 x I
r
(p.u.)
Slightly biased region limit = 1.00 - 10.0 x I
r
(p.u.)
Slope = 0.40 - 1.00
Trip by I
d
> = 5.00 - 40.00 x I
n
Blocking by 2nd harmonic = 0.10 - 0.30 x I
n
Blocking by 5th harmonic = 0.10 - 0.30 x I
n
87N Restricted earth fault protection
(restricted differential)
Reference nominal current = 1.00 - 100 000.00 A
Unbiased region threshold= 0.05 - 0.50 x I
r
Unbiased region limit = 0.01 - 1.00 x I
r
Slightly biased region slope = 0.01 - 2.00
Slightly biased region limit = 0.01 - 2.00 x I
r
Heavily biased region slope = 0.10 - 1.00
Relay operate angle = 60° - 180°
t = 0.04 -100.00 s
Table 6: ANSI code protection functions and parameters
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