Are there any dangers associated with the resonance effects of distributed line capacitance and the synchronous reactance of a generator?
Are there any dangers associated with the resonance effects of distributed line capacitance and the synchronous reactance of a generator?
Homework Answers
Yes. There can be catastrophic consequences as follows:
- It causes standing waves of current and voltage. They can cause infinite reflections causing overvoltages and insulation breakdown.
- Massive current flow in generator armature which may go as far as to harm the turbine.
- Harm to the load as at resonance the voltage across the capacitance is many times the rated value.
- Interference and high induced emfs in nearby communication circuits.
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Are there any dangers associated with the resonance effects of distributed line capacitance and the synchronous reactance of a generator?
A synchronous generator with a synchronous reactance of XS =j 0.45Ω is connected to a 20...
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b) An 80MVA, 11kV synchronous generator with a sub transient reactance j0.125pu is connected to each...
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A 480 V, 375 kVA, Y-connected synchronous generator has a synchronous reactance of 0.4 Ω and a ne...
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A 480 V, 375 kVA, Y-connected synchronous generator has a synchronous reactance of 0.4 Ω and a negligible armature resistance. This generator is supplying power to a 480 V, 80 kW, Y-connected synchronous motor with a synchronous reactance of 1.1 Ω and a negligible armature resistance. The synchronous generator is adjusted to have a terminal voltage of 480 V when the motor is drawing the rated power at unity...
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b) An 80MVA, 11kV synchronous generator with a sub transient reactance j0.125pu is connected to each of three busbars labelled A, B and C in Figure 2. Three equal current limiting reactors (100MVA, 11kV) feeders. The main busbars supply secondary busbars (E, F and G) through a line of reactance j2.7 and 100MVA, 11kV/33kV j0.06pu transformers at both ends connected in series with the are Busbar D is connected at the 33kV side of the transformer at G to facilitate...
b) An 80MVA, 11kV synchronous generator with a sub transient reactance j0.125pu is connected to each of three busbars labelled A, B and C in Figure 2. Three equal current limiting reactors (100MVA, 11kV) are connected in series with the feeders. The main busbars supply secondary busbars (E, F and G) through a line of reactance j2.70 and 100MVA, 11kV/33kV j0.06pu transformers at both ends Busbar D is commected at the 33kv side of the transformer at G to facilitate...
Please correctly answer question and post all steps! Will rate!
Thanks!
A 480 V, 375 kVA, Y-connected synchronous generator has a synchronous reactance of 0.4 Ω and a negligible armature resistance. This generator is supplying power to a 480 V, 80 kW, Y-connected synchronous motor with a synchronous reactance of 1.1 Ω and a negligible armature resistance. The synchronous generator is adjusted to have a terminal voltage of 480 V when the motor is drawing the rated power at unity...
. A synchronous generator has a per-unit synchronous reactance of 0.35 and is connected to a 1.0 pu bus. In this problem, you will draw a set of V curves, with E on the horizontal axis. For each curve, you must identify numerically the following points: minimum Ea with corresponding la; minimum la with corresponding Ea. (The remainder of the curves may be drawn freehand.) Plot V curves corresponding to: a. Zero active power b. P-1.0 pu
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3. A 722-MVA, 19-kV steam turbine generator has a per-phase synchronous reactance of 1.3 PU, and its internal (excitation) voltage is adjusted to 1.2 PU. The generator is connected to a 19 kV (line) infinite-bus. If the voltage angle (d) between the infinite-bus and the generator internal voltage is 20°, calculate, The generator active power output. The generator line current. Draw the phasor diagram for one phase.
Assignment 4 An 11 kV, 50-Hz, Y-connected synchronous generator has a synchronous reactance of Xs-0.5Ω and armature resistance, Ra-005Ω. The terminal voltage in all working conditions is assumed constant and equal to the rated voltage. The generator is delivering a load current of 2000A at 0.8 PF leading a. Draw the per-phase equivalent circuit of the generator. b. Calculate the induced EMF, EA. c. Calculate the real and reactive power delivered at the generator terminals. d. Sketch the phasor diagram...
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