VAMP 140 Overcurrent and earth-fault relay
Technical description
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16
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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:
22
22
)*(
ln
n
p
IkI
II
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
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