VAMP 140
Overcurrent and earth-fault relay
Technical description
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16
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VM140.EN011
Setting parameters of second harmonic blocking:
2.Ha (68)
Parameter: Value:
Unit: Default: Description:
If2>
10…100
%
10
Setting value If2/Ifund
t_f2
0.05…300.0
s
0.05
Definite operating time
S_On
Enabled;
Disabled
- Enabled Start
on
event
S_Off
Enabled;
Disabled
-
Enabled Start off event
T_On
Enabled;
Disabled
- Enabled Trip
on
event
T_Off
Enabled;
Disabled
-
Enabled Trip off event
Measured and recorded values of second harm. blocking:
2.Ha (68)
Parameter: Value: Unit: Description:
IL1H2.
%
2. harmonic of IL1, proportional
to the fundamental value of IL1
IL2H2.
%
2. harmonic of IL2
Measured
values
IL3H2.
%
2. harmonic of IL3
Flt
%
The max. fault value
Recorded
values
EDly
%
Elapsed time as compared to the
set operating time; 100% =
tripping
2.2.5.
Thermal overload protection T> (49F)
The overload function protects the line against thermal
overload. The thermal stress can be supervised by means of a
thermal image, which can be calculated from the standard
heating expression according to IEC 60255-8:
2
2
2
2
)
*
(
ln
n
p
I
k
I
I
I
t
−
−
⋅
=
τ
where:
t = trip
time
τ
= thermal time constant of cable
I
= average RMS value of three measured
phase currents
ln = natural
logarithm
Ip = preload current (corresponds to the heating
level reached)
k = factor for allowed continuous overload
I
n
= rated current