Operation

The power required for the logic circuit of the Chance Electronic Resettable Sectionalizer is obtained from the built-in current transformer. When a fault occurs, which exceeds the minimum actuating current of the sectionalizer, the logic circuit will "power-up." The upstream recloser opens the circuit causing the line current to fall below the "dead line threshold." The logic circuit recognizes this as a "count" and stores this occurrence in its memory for two minutes. In doing so, the CRS merely counts the backup reclose operations.

After a predetermined number of such operations, the CRS isolates the circuit while the back-up recloser is in the open position. The recloser is then allowed to close, restoring service to the unfaulted sections of the system. If the fault is temporary and is cleared before the sectionalizer count reaches the predetermined number, the sectionalizer remains closed and resets to its original state after its reset time expires.

The earlier versions of Chance Electronics Sectionalizer (Type CES) required replacement of the actuators after each operation of the sectionalizer. Users generally carried an inventory of and equipped each line truck with the actuators. The new Chance Resettable Sectionalizer (Type CRS) uses the spring loaded mechanism to actuate the drop out action of the sectionalizer. The mechanism can then be reset with the help of an adjustable wrench. this eliminates need to inventory of the actuator and the line crews can have one less item on their trucks.