. The Bell System technical journal . Fig. 8—Types of power systems. {A) Isolated neutral system under normalconditions. (B) Grounded neutral system under normal conditions. (C) Isolatedneutral system with single fault. {D) Grounded neutral system under faultconditions. If, in a power system, a second fault-to-ground occurs on anotherphase while the first persists, a large residual fault current will exist inthe line between the faults even if the neutrals are isolated. Simul-taneous faults on two phases at different points may occur on anytype of system, but are more likely to occur on an iso
. The Bell System technical journal . Fig. 8—Types of power systems. {A) Isolated neutral system under normalconditions. (B) Grounded neutral system under normal conditions. (C) Isolatedneutral system with single fault. {D) Grounded neutral system under faultconditions. If, in a power system, a second fault-to-ground occurs on anotherphase while the first persists, a large residual fault current will exist inthe line between the faults even if the neutrals are isolated. Simul-taneous faults on two phases at different points may occur on anytype of system, but are more likely to occur on an isolated neutralsystem than on one in which the neutral is solidly grounded. This is LOW-FREQUENCY INDUCTION 587 due to the fact that for the isolated system, full phase-to-phase orpossibly higher voltage is impressed between the unfaulted phasesand ground, thus increasing the voltage stress on the insulation of theentire system during the time of fault. Figure 9 shows a demonstration set-up to illustrate the effects offaults on an is
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