Why we use a resistance to ground the neutral when we need always low resistivity for the grounding?

Why we use a resistance to ground the neutral when we need always low resistivity for the grounding?

§  If we ground the generator directly then whenever a fault will take place at any phase with ground the fault current flowing throw the faulted phase-to ground-to neutral will be very high cause there will be no resistance to limit the value of fault current. Hence we insert a resistance in the neutral circuit to limit this fault current. Also we need to reduce the fault current to such a value that the protection CTs are able to identify the fault current without saturating the CTs. Communicate it to the protection relays & hence the relays can then isolate the system from the fault; so that the system is isolated from the fault before the harm is done by the fault current. That is the reason that all the equipment will be designed for fault KiloAmpere values for 1 sec so that the total operation(CT sensing-relay functioning-circuit breaker operation ) time will be less than 1 sec. hence the Breakers will isolate the fault before 1 sec i.e. within the time period the equipment are designed to carry the fault current. Thus all your objectives of:

§  preventing the arcing.

§  limiting the fault current.

§  isolating the faulted system are achieved