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PP846A 3BSE042238R2 Operation panel

Overvoltage setting (V-Setting) 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 is 1.4 U U 1.4 12 15 1.12 GN 1N

Over/undervoltage setting (MaxMin) This parameter enables the following operating modes to be selected: MAX (1ph): Pick-up when the highest phase voltage exceeds the setting.

Definite time stator earth fault (95 %)

Overvoltage setting (V-Setting) 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 is 1.4 U U 1.4 12 15 1.12 GN 1N

Over/undervoltage setting (MaxMin) This parameter enables the following operating modes to be selected: MAX (1ph): Pick-up when the highest phase voltage exceeds the setting.

Settings: Voltage V-Setting Delay Delay The definite time stator E/F scheme (95%) is designed for the protection of generators of generator/transformer units. Description The standard zone of protection of generators of generator/transformer units is 95 % of the length of the stator winding (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 a generator terminal and zero for an E/F at the star-point (see Fig. 3.5.10.2).