2. Deduce the exciting current for a 3-0, 3300-V generator when supplying 100 kW at 0.8 power factor lagging, given magnetisation curve on open-circuit : Line voltage : 3300 3600 3900 Exciting current : 80 96 118 There are 16 poles, 144 slots, 5 conductors/slot, single-circuit, full-pitched winding, star- connected. The stator winding has a resistance per phase of 0.15 Q and a leakage reactance of 1.2 Q. The field coils have each 108
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.
![2. Deduce the exciting current for a 3-̟, 3300-V generator when supplying 100 kW at 0.8 power factor
lagging, given magnetisation curve on open-circuit :
Line voltage :
3300
3600
3900
Exciting current :
80
96
118
There are 16 poles, 144 slots, 5 conductors/slot, single-circuit, full-pitched winding, star- connected. The
stator winding has a resistance per phase of 0.15 Q and a leakage reactance of 1.2 2. The field coils have each 108
turns.
[124 A] (London Univ.)
3. Estimate the percentage regulation at full-load and power factor 0.8 lagging of a 1000-kVA, 6,600-V,
3-0, 50-Hz, star-connected salient-pole synchronous generator. The open-circuit characteristic is as follows :
Terminal volt
4000
6000
6600
7200
8000
Field A.T.
5200
8500
10,000
12,500
17,500
Leakage reactance 10%, resistance 2%. Short-circuit characteristic : full-load current with a field excitation
of 5000 A.T. Take the permeance to cross armature reaction as 35% of that to direct reaction.
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