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Showing posts with label Variable Speed Generators. Show all posts
Showing posts with label Variable Speed Generators. Show all posts
Wound Rotor Induction Generators (WRIGs): Design and Testing
Written By Sajib Barua on Sunday, June 1, 2014 | 9:41 AM
Wound Rotor Induction Generators: Transients and Control
Written By Sajib Barua on Saturday, May 31, 2014 | 5:35 AM
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Most power systems (from 415 V upwards) are three‐phase systems. When the phases are balanced, the phasor diagrams and equations of one pha...
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Fault level and circuit-breaker ratings The fault level (sometimes called short-circuit level) is a term used to describe the 'str...
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The high demand of electricity together with the continuously variable nature, and our inability to store electricity in a significant num...
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Figure 2.7 shows a circuit with a supply system whose open-circuit voltage is E and short-circuit impedance is , where . The load impedanc...
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If it is assumed that the power network is operating in steady state and that a sudden change takes place due to a faulty condition, then ...
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The load in Figure 2.7 can be expressed as an admittance Y = G + jB supplied from a voltage V, where Y = 1/Z. G is the conductance, i.e. t...
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Single-phase Suppose we have a single-phase load as in Figure 2.7 supplied with a sinusoidal voltage whose instantaneous value is . The RM...
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Consider a simple load R+jX with a current I and voltage V, Figure 2.6. The complex power S is defined as (2.2) S can...
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In power systems it is essential to keep the frequency and the voltage close to their rated values. The frequency is controlled by contr...
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Figure 2.12 shows a one-line diagram of an AC power system, which could represent either a single-phase system, or one phase of a three-ph...
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