Angle stability limits are a result of which factor?

Angle stability limits are primarily influenced by the relationship between high torque and power angles in a power system. This relationship reflects the dynamic balance between the mechanical input power and the electrical output power of generators connected to the grid. When the power angle increases, it signifies that the generator is operating under a higher torque condition, which can lead to instability if the angle becomes excessively large. This condition may result in loss of synchronism among generators in the system, potentially leading to system outages or blackouts.

Additionally, while thermal capability and reactive power deficiency do impact system stability, they do not directly define the angle stability limits. Thermal capability pertains to the maximum load a piece of equipment can handle without overheating, influencing power system operations but not specifically the angle stability. Similarly, reactive power deficiency can lead to voltage instability, impacting system reliability, but it is not the fundamental driver of angle stability limits.

Thus, the primary focus of angle stability is on the interaction of power and torque angles, which are vital for maintaining synchronization across the system. This highlights the critical nature of maintaining these angles within safe limits to ensure stable operation of the interconnected power network.