Dynamic Arc Recognition and Termination (DART)
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 DART power supply responds in only a few microseconds.
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.
Usual spark duration
Spark duration with DART
Ensuring accurate electric behavior
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:
- "Soft" start-up of the load with limited current rise di/dt in milliseconds
- Well-defined electrical behavior of the load
- Optional di/dt detection for disconnection during a fault, which allows for longer cable distances.