Dynamic Arc Recognition and Termination

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Dynamic Arc Recognition and Termination ( engl. For dynamic detection and extinguishing an arc ), short DART , also Power-i , is called an electrical method for feeding a higher supply of energy for intrinsically safe field devices with a power up to 50  W in a hazardous area . Previous technologies only allow a transmission of approx. 2 W.

DART was developed in cooperation with the Physikalisch-Technische Bundesanstalt (PTB) and the company Pepperl + Fuchs .

functionality

DART enables the intrinsically safe operation of field devices with such high power in a hazardous area through early detection of a malfunction in the electrical system, as a result of which the circuit is switched off within 1.4  µs . As a result, in the event of a fault, the energy released is so limited that a safety-critical strength is not exceeded. The formation of an ignitable spark or the thermal heating of a component , which can also lead to an explosion, is excluded.

A fault is primarily recognized by the current characteristics . The length of the electrical line is important here, as this determines the signal propagation time. So that the electrical behavior of a consumer (field device) has no influence on the monitoring of the current, this must be clearly defined. In particular, the changes in the current flow over time must be limited. Therefore, no short-term high currents may be drawn from the consumer, as these would otherwise be recognized as a short circuit by the monitoring electronics of the DART power supply unit and the supply voltage would be switched off.

See also

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