IMG_ 20200522_ 153307 communication module

IMG_ 20200522_ 153307 communication module

Technical data of product parameters

The NPS protection is IMG_ 20200522_ 153307 always delayed to avoid false tripping
during transient phenomena and especially during phase-tophase and earth faults on the power system. The delay may be
relatively long, because the temperature rise of the endangered
parts of the rotor is relatively slow.By detecting excessively high voltages, the overvoltage function
prevents insulation breakdown of the windings of generator stators and power transformers and also excessive temperature
rise due to increased iron losses. Excessively high voltages of
longer duration are IMG_ 20200522_ 153307 especially likely in the event of voltage
regulator failure. A time delay is set to prevent false tripping
during transients. Usually there are two voltage stages, both of
which are arranged to trip the protected unit.
Please note that, although a setting of 2.0 UN is permitted, the
measuring range of the c.t./v.t. input channels is only 1.3 UN (i.e.
130 V resp. 260 V max.).
The first stage is intended for moderate overvoltages of long duration.
The second stage provides protection against high overvoltages
and is set to 70 % of the stator test voltage.
Where the rated voltages of the protected unit and the v.t’s differ,
the primary pick-up value in p.u. does not agree with the setting
of the protection and this has to be compensated using the
reference value of the A/D channel.
For example, for a generator rated voltage of UGN = 12 kV and a
primary v.t. rated voltage of U1N = 15 kV, the setting of the second stage isThe standard zone of protection of generators of generator/transformer units is 95 % of the length of the stator winding IMG_ 20200522_ 153307
(see Fig. 3.5.10.2). It is normal to limit the zone to 95 % to avoid
any risk of false tripping. The stator E/F function is connected
either to the v.t. at the stator star-point or to the v.t’s at the generator terminals. In both cases, the function monitors the displacement of the star-point caused by a stator E/F. The corresponding off-set voltage becomes a maximum for an E/F at agenerator terminal and zero for an E/F at the star-point

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