ARCON®: Extremely fast, extremely reliable

arc fault protection system ARCON® ARC-AT

The onset of an arc fault must be detected immediately – a lightning fast reaction is required. Eaton solves this with the arc fault protection system ARCONreg;.

The light sensors (ARC-SL) use optical fibre technology to monitor the main busbars and dropper bars, as well as all busbar assemblies and connection systems along their entire length. The radiation emitted by the arc fault is detected via the sleeving surface of the sensor. Only one line sensor is required for each switchgear section and main busbar system.

Alternatively available with current transformers with secondary currents of either 1 A or 5 A, the arc fault current is detected by measurement transducers positioned upstream of each feeder circuit-breaker. In the event of an arc fault, the light emitted by the fault and the arc fault current are detected by the sensors and evaluated in the master unit (ARC-EM). The central processing unit gives the disconnection signal to the quenching device (ARC-AT). The quenching device creates a bolted short-circuit on three poles parallel to the location of the fault. The voltage required for the arc fault is reduced on account of the short-circuit at the busbars and the arc fault is quenched in less than 2 ms after initiation, which is well before the maximum destructive force is achieved.

This is therefore achieved before the destructive maximum values of the arc fault are reached. The 3-phase short-circuit created by the quenching device is disconnected by the feeder circuit-breaker. This also receives the disconnection signal from the central processing unit as a back-up to the shunt release. Slave units are used to monitor and evaluate sensor signals, and in the event of an arc fault pass on signals to the central processing (master) unit via the bus. In its maximum configuration, the central processing unit can monitor two separate busbar sections and independently switch the individual quenching devices assigned to the busbar sections accordingly. Several central processing units can be used in one system if necessary. They are interconnected via a communication line and exchange overcurrent information with each other in the event of an arc-fault.

The ARCONreg; arc fault protection system offers personnel protection over and above that which is required by relevant standards. The implementation of system function protection sets new standards in the construction of power distribution systems, offering constantly high quality during operation and ensuring the continuity of the production process.

System function protection
System function protection means that the switchgear system can be immediately re-operated after it has shutdown due to an arc-fault after the cause of the arc-fault has been eliminated, and the insulation resistance has been measured and verified. Exchange of distribution system parts, components and equipment in the switchgear power section resulting from an effect of an arc-fault is not necessary. Complete functional endurance of all system parts and equipment is achieved. The criteria for system and personnel protection (compliant to EN 60439-1, supplement 2) are automatically assumed into the system protection function.

Complete functional endurance of all system parts and equipment is achieved.   Replacement of system components and equipment necessary.  

Further Product Information


New ARCON® video: "A Firework of Safety!"