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Which of the following mainly leads to voltage instability?

Which of the following mainly leads to voltage instability? Correct Answer Transfer of reactive power

Voltage instability:

  • Voltage instability may result in the form of a progressive fall or rise of voltage of some load buses. The possible outcome of voltage instability is loss of load in the area where voltages reach unacceptably low values, or a loss of integrity of the power system.
  • The main factor contributing to voltage instability is usually the voltage drop that occurs when reactive power flow through inductive reactance associated with the transmission network; this limits the capability of transmission network for power transfer.
  • The power transfer limit is further limited when some of the generators hit their reactive power capability limits.
  • The driving force for voltage instability is the loads; in response to a disturbance, power consumed by the loads tends to be restored by the action of distribution voltage regulators, tap changing transformers, and thermostats.

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