Modern excitation systems include devices for controlling or Limiting machine terminal voltage (overvoltage biters), Volts P r hertz ratio w/Hz biters), U K O & U~~ machine field current (overexcitation limiters), and the reactive load absorbed by the machine (underexcitation Limiters). Functional testing of these limiters before they are placed into testing of excitation limiters commercial service is recommended. The Bureau of to determine synchronous machine reactive capability Reclamation routinely performs functional testing to determine limiters as pad of excitation system tests on its the coordination of these limiters with the corresponding hydroelectric generators. This paper & C U S S &e purpose protective devices. Also, funCtiOIld testing Of the limiters and practice of functionally testing these Limiters. will confirm proper operation and stability. and function properly, these relays should not trip the machine. The limiter and relay adjustments provided in this paper are typical for hydroelectric generators installed in B~~~~~ of ~~l~t i~~ facilities. A number of utilities the actual settings and operational characteristic of these [1,2,3,4,51. In addtion, tests are performed to determine
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