Abstract :
SOME EXAMPLES of multiple unbalances on a 3-phase network are: 1. Two or more unsymmetrical short circuits at different points of a network. Faults involving more than one circuit are not unusual on multicircuit lines, and simultaneous faults sometimes occur even at geographically separated points, especially on systems grounded through high impedance. System stability or operation of relays during such faults may require investigation. 2. A short circuit partially cleared by the blowing of a fuse. 3. A short circuit on a line having series capacitors, the capacitors in the faulted conductor being short circuited by protective devices. 4. Two or more single-phase or unbalanced loads.
