IMG_ 20200522_ 153209 module

IMG_ 20200522_ 153209 module

Technical data of product parameters

A tripping current is not IMG_ 20200522_ 153209 set on an IDMT overcurrent function as it
is on a definite time overcurrent function. Instead the position of
the characteristic is chosen such that it is above the load current.
The function, however, has a “base current” setting IB, which is
set to the full load current IB1 of the protected unit. The base
current setting determines the position of the basic characteristic. The characteristic is enabled when the base current is
exceeded by a preset amount (I-Start). The adjustment of the
base current IB to the load current IB1 of the protected unit instead of its rated current enables forThe multiplier k1-Setting enables the IDMT characteristic chosen IMG_ 20200522_ 153209
by the setting of parameter c to be shifted without changing its
shape. This is used for grading the operating times of a series of
IDMT relays along a line to achieve discrimination.
For example, in the case of the “very inverse” characteristic, the
constant c = 1 and the factor k1
13.5. The operating time t is
given by the equationAn NPS current is usually caused by asymmetrical loading of the
three phases, but may also be the result of an open-circuit phase
(single-phasing).
An asymmetrical load on a generator produces a magnetic field,
which rotates in the opposite direction to the positive-sequence
field. The negative-phase sequence flux induces currents in the
rotor and these result in additional rotor losses and increased
rotor temperature. The latter can represent a hazard for the rotor
and this is the reason for the NPS protection. IMG_ 20200522_ 153209
The asymmetry of the load on a generator is defined in terms of
the negative-sequence stator current I2, which is therefore the
quantity monitored.The definite time NPS function is intended for systems where
asymmetries are of longer duration, but do not change frequently. This generally applies in the case of small to mediumsize generators. Two NPS stages are used, one for alarm and
one for tripping.

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