By United States Army
EM 1110-2-3006 HYDROELECTRIC strength crops electric layout. Engineering and layout Engineer Manual.. unfastened LEAF UNBOUND version NO BINDER.
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Extra info for Army Engineer Manual - Engineering And Design - Hydroelectric Power Plants Electrical Design
A) Very high reliability and operational flexibility. The spacing of bus supports should limit bus sag under maximum loading to not greater than the diameter of the bus, or 1/150th of the span length. IEEE 605 provides further information on substation electrical, mechanical, and structural design considerations. (b) Any breaker or either bus can be isolated without service interruption. (c) A bus fault does not interrupt service. 5-5. Switchyard Materials (d) There is a double feed to each circuit.
Class OA/FA and Class FOA meet all the usual requirements for transformers located in hydro plant switchyards. The use of triplerated transformers such as Class OA/FA/FA is seldom required unless the particular installation services a load with a recurring short time peak. e. Class FOA transformers. On Class FOA transformers, there are certain considerations regarding static electrification (build-up of charge on the transformer windings due to oil flow). Transformer suppliers require oil pump operation whenever an FOA transformer is energized.
The approximate effect of higher- or lower-than-normal impedances on the cost of transformers is given in Table 4-2. The value of transformer impedance should be determined giving consideration to impacts on selection of the interrupting capacities of station breakers and on the ability of the generators to aid in regulating transmission line voltage. Transformer impedances should be selected based on system and plant fault study results (see Chapter 2). 5 percent. 00). 76 CLASS FOA OR CLASS FOW MINIMUM MAXIMUM INCREASE IN TRANSFORMER COST 3% 2% 1% 2% 4% 6% (2) In making comparisons or specifying the value of impedance of transformers, care should be taken to place all transformers on a common basis.