PM510V16 3BSE008358R1 ABB Spare parts of industrial control automation CPU module

PM510V16 3BSE008358R1 ABB Spare parts of industrial control automation CPU module

PM510V16 3BSE008358R1 ABB Spare parts of industrial control automation CPU module

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The first mode foresees tripping times of about one second and is used mainly

in the case of not particularly high short-circuit currents where a power flow is

not uniquely defined.

The second mode enables distinctly shorter tripping times: with respect to a

time discrimination coordination, there is no longer any need to increase the

intentional time delay progressively as we move closer to the source of the

power supply. The maximum delay is in relation to the time necessary to detect

any presence of a blocking signal sent from the protective device downstream.

Advantages:

�?reduction of the tripping times and increase of the safety level; the tripping

times will be around 100 milliseconds;

�?reduction of both the damages caused by the fault as well of the disturbances

in the power supply network;

�?reduction of the thermal and dynamic stresses on the circuit-breakers and on

the components of the system;

�?large number of discrimination levels;

�?redundancy of protections: in case of malfunction of zone discrimination, the

tripping is ensured by the settings of the other protection functions of the

circuit-breakers. In particular, it is possible to adjust the time-delay protection

functions against short-circuit at increasing time values, the closer they are to

the network’s feeder.

Disadvantages:

�?higher costs;

�?greater complexity of the system (special components, additional wiring,

auxiliary power sources, ...).

This solution is therefore used mainly in systems with high rated current and

high short-circuit current values, with precise needs in terms of both safety and

continuity of service: in particular, examples of logical discrimination can be

often found in primary distribution switchboards, immediately downstream of

transformers and generators and in meshed networks.