PFTL201D 10KN/20KN/50KN ABB Weighing pressure sensor

PFTL201D 10KN/20KN/50KN ABB Weighing pressure sensor

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importance both to ensure the correct economic and functional operation of

the installation as a whole and to reduce to a minimum any problem caused by

anomalous operating conditions and/or malfunctions.

The present analysis discusses the coordination between the different devices

dedicated to the protection of zones and specific components with a view to:

• guaranteeing safety for people and installation at all times;

• identifying and rapidly excluding only the zone affected by a problem, instead

of taking indiscriminate actions and thus reducing the energy available to the

rest of the network;

• containing the effects of a malfunction on other intact parts of the network

(voltage dips, loss of stability in the rotating machines);

• reducing the stress on components and damage in the affected zone;

• ensuring the continuity of the service with a good quality feeding voltage;

• guaranteeing an adequate back-up in the event of any malfunction of the

protective device responsible for opening the circuit;

• providing staff and management systems with the information they need to

restore the service as rapidly as possible and with a minimal disturbance to

the rest of the network;

• achieving a valid compromise between reliability, simplicity and cost

effectiveness.

To be more precise, a valid protection system must be able to:

• understand what has happened and where it has happened, discriminating

between situations that are anomalous but tolerable and faults within a given

zone of influence, avoiding unnecessary tripping and the consequent

unjustified disconnection of a sound part of the system;

• take action as rapidly as possible to contain damage (destruction, accelerated

ageing, ...), safeguarding the continuity and stability of the power supply.

The most suitable solution derives from a compromise between these two

opposing needs - to identify precisely the fault and to act rapidly - and is defined

in function of which of these two requirements takes priority