Q3. In case of generator stator single phase earth fault, how to protect 100% range of...

Q3. In case of generator stator single phase earth fault, how to protect 100% range of the stator winding? Explain the principles of related protections in detail.

Expert Solution

Manojponduru answered 2 years ago

Present the single-phase equivalent circuit of a synchronous generator.

A 2000 V single-phase synchronous generator is being used as a backup generator outside a diagnostic...

A 2000 V single-phase synchronous generator is being used as a backup generator outside a diagnostic center. When the generator terminals are short-circuited and a field excitation current of 2.5 A is passed, the ammeter between the terminals read 100 A of full load current. If the terminals of the same generator are opened and the voltage across them is measured using a voltmeter, we get the value of 500 V with the same excitation current. The armature resistance is...

The terminal voltage across a single phase of a stepper motor used as a generator is...

The terminal voltage across a single phase of a stepper motor used as a generator is applied across a load resistor of 33 ohms. This terminal voltage has an amplitude of 18.7V and a frequency of 242 Hz. From a previous measurement, we know that this stepper motor phase has an internal resistance of 11.2 ohms. What is the time-averaged power delivered to the load? What is the electrical efficiency of this circuit? Write down an expression for the instantaneous...

A 3-phase, 5 kVA, 208 V, 4-pole, 60 Hz, star-connected synchronous generator has negligible stator winding...

A 3-phase, 5 kVA, 208 V, 4-pole, 60 Hz, star-connected synchronous generator has negligible stator winding resistance and a synchronous reactance of 8 Ω per phase at the rated terminal voltage. The generator is connected in parallel to a 3-phase, 208 V, 60 Hz infinite bus. All losses may be neglected. a) Determine the excitation voltage and the power angle when the machine is delivering rated apparent power at 0.8 PF lagging. b) If the field excitation is increased by...

Q3/ Draw the out voltage and current waveforms of a single-phase cycloconverter connected to a purely...

Q3/ Draw the out voltage and current waveforms of a single-phase cycloconverter connected to a purely resistive load. The following information could be useful: Load Supply Voltage, Supply Frequency Output Frequency Firing Angle At 202 230Vrms, 50 Hz 12.5 1300 sec Your drawing should contain all the detaiks including Amplitudes, Time, Degrees and Axis Names,

Problem 3: A single phase 60 Hz two-winding power transformer is rated at 2400V/240V and 100...

Problem 3: A single phase 60 Hz two-winding power transformer is rated at 2400V/240V and 100 kVA with Zeq = 0.5 + j0.8 Ohm. If an autotransformer is built from this conventional transformer to supply a load at 2640V with supply voltage 2400V. Draw the autotransformer and calculate Zeq, the voltage, current and apparent power rating of the auto transformer. Also calculate the apparent power rating advantage of autotransformer over conventional transformer.

What are single case studies and how are they used in research?

1. In single-phase circuits test, consider the instantaneous power waveforms. How is the value of the...

1. In single-phase circuits test, consider the instantaneous power waveforms. How is the value of the real power obtained in the software? What is the significance of the instantaneous power going negative (consider direction of power flow and reactive power)? 2. For each of the resistive, inductive and capacitive loads (loads 1-3), comment on whether the current waveform is smoother, noisier or the same shape as the voltage waveform. Explain the results using the following, for a resistor i = v/R,...

1. With single-sourcing, how does the firm protect itself from price gouging? From strikes or interruptions...

1. With single-sourcing, how does the firm protect itself from price gouging? From strikes or interruptions to supply? Please discuss specific ways.

Describe the parameters for visual analysis of case study data. How does analysis through single case...

Describe the parameters for visual analysis of case study data. How does analysis through single case effect size statistics effect the confidence in our predictions?

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