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A ________ is a failure in a power system of interconnected parts in which the failure of a part can trigger the failure of successive parts.
cascade tripping
black out and cascade tripping
black out
brown out
cascade tripping
Cascade tripping is a progressive failure sequence in a power system where the disconnection or failure of one transmission line or component leads to an overload on adjacent lines, causing them to trip sequentially. This chain reaction typically occurs due to protective relays reacting to redistributed power flows following an initial contingency.
IEEE Std C37.113
Cascade tripping is a progressive failure sequence in a power system where the disconnection or failure of one transmission line or component leads to an overload on adjacent lines, causing them to trip sequentially. This chain reaction typically occurs due to protective relays reacting to redistributed power flows following an initial contingency.
P=XV1тАЛV2тАЛтАЛsin(╬┤) тАФ Power transfer equation between two buses
InewтАЛ=IoldтАЛ+╬ФI тАФ Current redistribution following a line outage
When a transmission line trips due to a fault, the power it was carrying is redistributed to other paths according to the network impedance, governed by Kirchhoff's laws. If these alternative paths are already operating near their thermal limit, the additional current causes protective relays (such as distance or overcurrent relays) to detect an overload or under-voltage condition and trip as well. This creates a feedback loop of successive disconnections until the system stability is lost or the network collapses.
Cascade tripping is often the primary cause of wide-area blackouts.
Preventive measures include wide-area monitoring systems (WAMS) and adaptive protection schemes.
System stability depends on the NтИТ1 contingency criteria.
Phase angle instability often precedes the cascade.
Protects individual equipment from permanent thermal damage
Prevents fire hazards during short circuits
Can lead to large-scale system instability
May result in total grid collapse (blackout)
Power system stability analysis
Grid protection coordination
Smart grid self-healing logic
Blackout (Option C) is the final outcome or state of the system, not the mechanism of failure.
Brownout (Option D) refers to a reduction in voltage, which can be a symptom but not the triggering mechanism of cascade tripping.
Option B combines the state and the mechanism, whereas cascade tripping specifically describes the dynamic process of sequential failure.
A is correct тАФ cascade tripping refers to the sequential relay operation initiated by the redistribution of power following an initial failure.
In competitive exams, always distinguish between the 'trigger' (cascade tripping) and the 'state' (blackout) when questions discuss grid failure dynamics.
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