why the admittance matrix or y bus matrix of a large network
is called sparse matrix?
Answer Posted / bharat rathod
> Y-bus and Z-bus both are used for designing and modeling of transmission system.
> Removal of short-circuit element is easy in case of Z-bus. And any modification in Z-bus is easy. Z-bus is always full matrix.
> Any modification like removal of any transmission line is difficult in case of Y-bus. And, Y-bus is highly sparse. Y-bus is having 97% sparcity.
Is This Answer Correct ? | 1 Yes | 3 No |
Post New Answer View All Answers
what is meant by re-rolling motor? how it differs from standard motor?
whether fibre optic cable in high voltage earth conductor is used for protection circuits
Electrical Engineering
1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.
describe the Operation of induction generators from bus bars
Define filter?
What shall be the secondary output voltage if the primary winding of a 220/6V, 50 Hz transformer is energized by an 110V, 60 Hz supply?
If UG power cable both ends are to be earthed or what? If not why?
What technology is used in latest generators?
Where can I get Iidian straderd specifications for electrical items or works in web? please help me.
Why we used 690V in ACS 800 drives.Why dont use standard voltage like 415v or 1.1Kv
How to select batteries required for ups and the inverter if we Known load? And how AH is selected of battery?
what type of motor used to move a 1 ton gate? and relate ratings with load.
What does quality factor depend on in resonance?
Q.1:What protection will be used on HT and LT side of 33/0.4 KV, MVA transformer. Indicate capacities of protective device to be used. Q.2:Which types of back-up protections are used in the power transformers? What do you understand by the term over travel in the relay? Q.3:How star and delta connected winding transformer are provided from earth fault