Chapter 9
Transformer, Reactor, and Shunt Capacitor Protection
9.1 Transformers
Transformers are everywhere—in all parts of the power system and between all voltage levels and existing in many different sizes, types, and connections. Small transformers of about 3–200 kVA can be observed mounted on power distribution poles in many areas. A 325 MVA, 230–115 kV autotransformer with a 13.8 kV tertiary is shown in Figure 9.1.
Figure 9.1
Three-phase 325 MVA, 230:115 kV autotransformer bank with a 13.8 kV tertiary. (Courtesy of Puget Sound Power & Light Company, Bellevue, WA.)
Usually, circuit breakers or other means of disconnection are available ...
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