1) A load of 130 MW at a power factor of 0.75 lagging can be delivered by a 3-phase transmission line. The voltage at the receiving end is to be maintained at 45 kV and the loss in the transmission is 5 % of the power delivered. (Consider the line to be a short transmission line) Find Single-phase Power delivered Answer for part 1 Per phase voltage Answer for part 2 Current flowing through the transmission line Answer for part 3
Load flow analysis
Load flow analysis is a study or numerical calculation of the power flow of power in steady-state conditions in any electrical system. It is used to determine the flow of power (real and reactive), voltage, or current in a system under any load conditions.
Nodal Matrix
The nodal matrix or simply known as admittance matrix, generally in engineering term it is called Y Matrix or Y bus, since it involve matrices so it is also referred as a n into n order matrix that represents a power system with n number of buses. It shows the buses' nodal admittance in a power system. The Y matrix is rather sparse in actual systems with thousands of buses. In the power system the transmission cables connect each bus to only a few other buses. Also the important data that one needs for have a power flow study is the Y Matrix.
Types of Buses
A bus is a type of system of communication that transfers data between the components inside a computer or between two or more computers. With multiple hardware connections, the earlier buses were parallel electrical wires but the term "bus" is now used for any type of physical arrangement which provides the same type of logical functions similar to the parallel electrical bus. Both parallel and bit connections are used by modern buses. They can be wired either electrical parallel or daisy chain topology or are connected by hubs which are switched same as in the case of Universal Serial Bus or USB.
1)
A load of 130 MW at a power factor of 0.75 lagging can be delivered by a 3-phase transmission line. The voltage at the receiving end is to be maintained at 45 kV and the loss in the transmission is 5 % of the power delivered. (Consider the line to be a short transmission line) Find
Single-phase Power delivered
Answer for part 1Per phase voltage
Answer for part 2Current flowing through the transmission line
Answer for part 33 Phase Losses in the transmission line
Answer for part 4Per phase resistance of the transmission line
2)
a) Discus why the transmission systems are mostly overhead systems.
b)Discuss why all overhead lines use ACSR conductors.
c) Discuss why at 400 kV and above the transmission lines have bundled conductors.
d) How do the various devices protect the penstock?
e) Discuss why the transmission lines are 3 phase 3 wire circuits while secondary distribution lines are 3
phase 4 wire circuits.
f) At which places the diesel power stations are finding favor? Why?
g) How do voids in the insulation cause breakdown of the cable?
h) What is the function of a condenser in a steam power plant?
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