Autoreclosure And Sectionalizer Operation
Autoreclosers are more attractive than relays in distribution feeder protection as
From below figure, the speed ratio of 20K and 20T fuses are respectively
Time interval between the autorecloser trip and the consecutive reclosing attempt is termed as
Sectionalisers should have breakers (or relays with breakers) or reclosers working as a backup device. True or False?
Zone of operation of the fuse is limited by
Consider 5P20 class CT ratio: 1000/1, Normal rated current of 900 A. Consider a overloading of 10 % while calculating plug setting of the relay. Let the initial set TMS be 0.15. Relay settings has ranges for PSM of 50% to 200% in steps of 25% and TMS setting range of 0.1 to 1.1 in step of 0.05. The operating time for a three phase fault of 10 kA is less for
Consider 5P20 class CT ratio:1000/1, Normal rated current of 900 A. Consider a overloading of 10 % while calculating plug setting of the relay with IEC EI curve. Relay settings has ranges for PSM of 50% to 200% in steps of 25% and TMS setting range of 0.1 to 1.1 in step of 0.05. For a 10 kA three phase fault, operating time is 0.242 s. TMS setting of the relay is
Consider that the sectionaliser S2 is absent in the Figure 1 of demonstration/procedure. The probable count setting of the sectionaliser S3 would be
After the recloser is completely locked out the sectionaliser to which first closing command is given as per the network configuration of Figure 1 is