VAMP 130
Overcurrent and earth-fault relay
Technical Description
VAMP Ltd
16
Vamp 24h support phone : +358 (0)40 573 6316
VM130.EN003
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
W
where:
t =
trip
time
W
= thermal time constant of cable
I
= highest 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
