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DP-300
The current flowing in the individual conductors is measured by means of current transformers installed on both sides of the protection zone. These transformers form the limits of the protection zone. Any two-phase or three-phase short circuits and ground faults are recognized by the DP-300 as fault currents. By means of freely configurable relays, the DP-300 will indicate if any of the adjusted fault current limits have been exceeded. In the event that fault currents occur outside of the protection zone, the relay does not cause an opening operation. Hence the unit can be used in protection systems requiring selective tripping operations. To adapt the network configuration to the DP-300 it is possible to change the phase shift of the transformer via selecting the vector group in the display. The different nominal currents of the high and low voltage side of the transformer, as well as the transformer ratio, may be configured. Every measuring point may be set separately. These features permit the DP-300 to be universal in its applications. The DP-300 permits design simplification of the switchgear cabinet, facilitates the commissioning, ensures the operation of the system, is user friendly, and increases the availability of the system. |
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