Sectionalizer is installed in different branch/line in a power distribution system especially in ring main type distribution system. It has been observed that about 70% of faults in power distribution system are Transient Faults (i.e. short-time faults) which get cleared within mille-seconds. The upstream Autorecloser, through a number reclosing operations with a definite interval of times determines the type of the fault (transient or permanent) and in case of permanent faults, the faulty section is isolated by Sectionalizer and power is restored to the healthy branches of the distribution system with a minimum time lag.
Every Control Unit is having a communication Modem (leased line / GPRS / 3G/GSM/Fibre Optic); hence they are connected to each other and also with auto-recloser and with the integrated SCADA (installed at substation) based on standard communication Protocol IEC-60870-5-104. Moreover, there will be dedicated RS-232C serial port capable of communicating (over IEC-60870-5-101).
Every control unit is equipped with rechargeable dry battery of adequate power delivering capacity & along with battery charger.