(Solved): Consider the distribution line system shown in Figure 1. The protection scheme used for protecting t ...

Consider the distribution line system shown in Figure 1. The protection scheme used for protecting this system uses an SEL-751A Feeder Relay with the setting described as follows: Programmed with C1 Characteristic Curve. Time dial (TD) of 1. Maximum (all) Phase TOC of 1 Amp Figure 1: Distribution line supply system with SEL-751A Feeder Relay 751A11D1D0X76811610 and Z011 1.1 Calculate the current flow in the feeder when the load is operating at its maximum capacity. 1.2 Determine in seconds how long the IED will take to send the trip signal to the circuit breaker when the current flow in the system is double the maximum rated current of the load. 1.3 Draw the graphical logic used to assign the IED operating wordbit to the physical output terminal OUT103 of the IED. 1.4 The SEL-751A used for the protection scheme described above is now modified to operate for overload currents that flow through the neutral conductor. 1.4.1 Write down the name of the element and its ANSI Code (relay wordbit) that would be used to protect the system against the overload current flow in the neutral conductor. 1.4.2 Draw the graphical logic to assign all the IED operating wordbits after the protection scheme has been modified to the same physical output OUT103. Page 1 of 1