If MVAR of generators is insufficient, what factor will also fail on the system?

When the reactive power (measured in MVAR, or megavolt-amperes reactive) supplied by generators is insufficient, it can lead to voltage instability within the power system. Reactive power is essential for maintaining voltage levels across the network, as it helps to establish and control electric fields in the transmission lines and equipment.

In situations where there is a lack of reactive power, voltage drops can occur, which may lead to under-voltage conditions, especially during times of high demand or when there are faults in the system. Insufficient voltages can trigger protective relays and potentially cause generators, transformers, and other equipment to disconnect from the grid in order to protect themselves from damage.

While factors such as frequency, active power, and phase angle are crucial in power system operations, they are not directly impacted by insufficient MVAR levels in the same manner that voltage is. Voltage stability is directly tied to the availability and balance of reactive power in the system, therefore making it the most relevant factor that would fail or become problematic when MVAR is insufficient.