When conducting a reactive power capability test, which increment amount is typically not exceeded?

In reactive power capability tests, a common standard is to assess how much reactive power (measured in MVAR) a generator can provide or absorb to maintain system stability and voltage levels. The range of testing increments is designed to ensure that the tests are manageable and realistic for operational capacities.

Choosing an increment of 100 MVAR as the typical maximum aligns with the operational characteristics and capabilities of most generators in a large grid like PJM, which encompasses a variety of generator types. Standard practice often maintains increments below this level to avoid overstressing equipment and to adhere to regulatory and safety guidelines. Generators typically have specifications that limit their reactive power capability based on design and operational parameters.

Exceeding this increment might not only subject the generators to undue stress but could also create risks for voltage stability across the grid. Thus, 100 MVAR serves as a practical threshold, allowing for effective testing without exceeding the capabilities of most generators in the system.