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A spark caused by opening or closing an electric circuit has a very characteristic and easily detectable change of current and voltage. This change is detected by DART and the circuit switched off in only a few microseconds (µs). Thus, even at higher power levels sparks never become incendive. The response of the DART power supply is about 1.4 µs.
In dynamic systems such as DART, the length of the cable has to be taken into consideration. The information about a current change (di/dt) and the corresponding "turn off" from the power supply travels as a guided wave along the cable from the fault location to the power supply and back at approx. 160.000 km/sec. This is why the length of the cable is an important aspect of safety considerations.
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A decoupling module integrated in the load ensures a well-defined electrical behavior for both: function and safety. It permits operation of practically any load with DART and is integrated into the explosion-proof housing of the load. The decoupling module essentially fulfills the following tasks:
bull"Soft" start-up of the load with limited current rise di/dt in milliseconds
bullWell-defined electrical behavior of the load
bullOptional di/dt detection for disconnection during a fault, which allows for longer cable distances.
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