Product Details
Product Description
Product Description
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.
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