VAMP Ltd Overcurrent and earth-fault relay
Technical description
VAMP 140
VM140.EN011 Vamp 24h support phone +358 (0)40 573 6316
17
The heating time constant (τ) and the load current factor (k)
corresponding to the maximum thermal load are adjustable.
Factor k defines the load current value, which, when exceeded,
results in a thermal trip.
The cooling time constant of the thermal overload protection is
the same as the heating time constant.
The thermal overload stage is provided with a separately
adjustable alarm function, the setting range of which is
60...99% of the thermal trip level.
Figure 2.2.5-1 Principle of thermal overload protection.
Parameters of the thermal overload protection:
T> (49)
Parameter: Value/unit:
Measured
value
Temp %
Calculated thermal load (100%
= tripping)
T> A
Permitted max. cont. current
primary value
T> x In
Perm. max. cont. current as
compared to In
Alarm % Start level set value
Setting
values
tau (τ)
min Heating time constant
Fixed value
tau2 (τ)
x In Cooling time constant
SCntr Start counter (Start) reading
Recorded
values
TCntr Trip counter (Trip) reading
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