By Whitaker, Jerry C
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The ∆-∆ connection does not cause a phase shift between the primary and the secondary sides. 23. The transformation ratio is equal to the ratio of the turns in each of the phases. There is no problem from third-harmonic overvoltage or telephone interference because such disturbances get trapped in the delta and do not pass into the lines. Although these four configurations are the most common ones used, other arrangements are possible, including: • Open-Delta. An advantage of the ∆-∆ connection is that if one of the single-phase transformers becomes damaged or is removed for maintenance, the remaining two can be operated in a so-called open-delta connection.
E F is the internal voltage (phasor form) and Vt is the terminal voltage. between machines increases or oscillates for an extended period of time, the system is considered unstable. 17) governs the motion of the machine rotor. J is moment of inertia, δm is mechanical torque angle with respect to a rotating reference, ωm is shaft angular velocity, and Ta is the accelerating torque. Two factors that act as criteria for the stability of a generating unit are the angular swing of the machine during and following fault conditions, and the time it takes to clear the transient swing.
Cooling water enters the reactor from the bottom, flows through the core, and is heated by nuclear fission. 38, the pressure is low (about 1000 psi). 38 Typical configuration of a boiling-water reactor. ) steam at about 545°F. The remaining water is recirculated and mixed with feedwater. The steam drives a turbine that typically rotates at 1800 rpm. The rest of the plant is similar to a conventional power plant. 38 shows all the major components of the reactor. The fuel and control rod assembly is located in the lower part.