Theory of operation single phase induction generator at load state , Thesis

Theory of operation single phase induction generator at load state , - Thesis Example , the excitation voltage and frequency vary depending on the rotor speed, the values of the capacitance and the winding inductance and the load current. For any value of capacitance, there is a minimum rotor speed at which self-excitation would occur [1]. It is difficult to measure the self inductance of the generator winding directly. An approximation can be made by driving the rotor at synchronous speed and measuring the stator voltage and current. At the rotor synchronous speed, no current is induced in the rotor and it is a virtual open circuit. The measured impedance (V/I) can be approximated for the winding self-inductance. From the above equations, it is clear that the self-inductance of the winding would vary with the voltage induced in the winding. The variation of magnetizing inductance with voltage for a specific induction generator is shown in Fig 2. b) For a given speed of the rotor, the voltage generated in the winding would vary with the value of the connected parallel capacitor. The relationship between the terminal voltage and the value of the capacitor for a specific induction generator is shown in Fig 3. One requirement in any electrical generator is for the terminal voltage to remain constant when the connected load varies. Most electrical loads operate satisfactorily only in a narrow range around their rated voltage. The value of capacitance needed to maintain constant terminal voltage at a given rotor speed is shown in Fig 4 for a specific induction generator. The graph shows that the variation is linear. In addition to the constant voltage, an alternating current generator also needs to supply power at a constant frequency. For the single phase self-excited generator, we know from induction motor theory that as the load current changes, the slip between the rotor and the stator would vary and cause the induced stator frequency to vary. This relationship for a specific induction generator is shown in Fig 5. 1. Robinson, L. and Holmes,

(Ethics and Comunication) Reflection on organizational change Article

(Ethics and Comunication) Reflection on organizational change - Article Example Whether the change is big or small, it will still impact us. Unsurprisingly, we react to change by putting up a wall around us to protect ourselves from the effects of change. However, there are those individuals who embrace change and its effects on their lives. The good thing with this attitude is that if the organizational change results in a good outcome, the people who embrace change will be the first ones to reap the rewards. The downside to this mindset is that if the organizational change doesn’t go so well, these types of people will be the first to bear the full force of its effects. I believe that organizational change can be a good thing if conducted in the right atmosphere and if the wider organization can come to a consensus. The best type of organizational change is change that is accepted by the wider majority so its effects will then be lessened. I myself am sceptical of change because I see no need for changing something just for the sake of changing. If an o rganization is already running smoothly, then there is no need to upset the balance in the organization.