TRANSPOSITION - In practice, the three-phase conductors of a three-phase line are seldom equilaterally spaced. The usual nonsymmetrical spacing produces unequal inductances in the three phases, leading to unequal voltage drops and imbalance in the line. To offset this imbalance, the positions of the inductors are interchanged at regular intervals in the line. This practice is known as, SUBSTATION - Is any building, room or separate place which houses or encloses electrical supply equipment connected to transmission or distribution lines and the interior of which is accessible, as a rule, only to properly qualified persons., CASCADING OUTAGE - The uncontrolled successive loss of system Components triggered by an incident at any location.,

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