PFTL301E 1.0KN 3BSE019050R1000 ABB Tension sensor clamp equipment

PFTL301E 1.0KN 3BSE019050R1000 ABB Tension sensor clamp equipment

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Time discrimination

This type of discrimination is an evolution from the previous one. The setting

strategy is therefore based on progressively increasing the current thresholds

and the time delays for tripping the protective devices as we come closer to the

power supply source. As in the case of current discrimination, the study is

based on a comparison of the time-current tripping curves of the protective

devices.

This type of coordination:

• is easy to study and implement;

• is relatively inexpensive;

• enables to achieve even high discrimination levels, depending on the Icw of

the upstream device;

• allows a redundancy of the protective functions and can send valid information

to the control system,

but has the following disadvantages:

• the tripping times and the energy levels that the protective devices (especially

those closer to the sources) let through are high, with obvious problems

concerning safety and damage to the components even in zones unaffected

by the fault;