1- Some HV - TL use Double Circuit .instead of One, why To transmit maximum voltage stability, and enhance the steady state stability. O To increase the capacity of HVTL and to enhance power system stability. a- C- All these answers are wrong. d- To increase the impedance of HVTL and to enhance power system stability. Sometimes we use Red Balls with HV T in snecific location
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- Some HV - TL use Double Circuit .instead of One, why
To transmit maximum voltage stability, and enhance the steady state stability.
6 To increase the capacity of HVTL and to enhance power system stability.
a-
All these answers are wrong.
d- To increase the impedance of HVTL and to enhance power system stability.
2- Sometimes we use Red Balls with HV.TL in specific locations ? why and where
a- To prevent HV.TL from lightning, it located at earth wire over roads and rivers.
To give an alarm for the planes, it located at earth wire over roads and rivers.
To reduce static transient voltage, it located at earth wire over roads and rivers.
d- To reduce static transient voltage, it located at earth wire everywhere.
3- How you can read this impulse voltage : 1.2/50 us and at which ? Standard
Durations wave front : 1.2 tr, Wave tail duration is defined as 50 m.si as in
International Standard).
C Durations wave front : 1.2 tr ( where tr is the transient time ), Wave tail
duration is defined as 50 m.s ( as in International Standard).
d- Durations wave front : 1.2 tr, Wave tail duration is defined as 50 m.s ( as in
British Standard ).
e- All these answer are wrong.
4- if we have a power system of 1 pu volt at sending busbar and 0.9 pu at receiving end
busbar with Xd = 0.45 pu, determine the allowable transfer power that the system
will not lose stability , also determine the maximum power transfer , take .the base
MVA = 500 MVA
The allowable transfer power = 500 MVA Max power = 1000 MVA.
b- The allowable transfer power = 2000 MVA Max power 1000 MVA.
C- The allowable transfer power = 1000 MVA Max power = 1000 MVA.
d- The allowable transfer power = 500 MVA , Max power = 500 MVA
5- Back inverse voltage value (Vbin) is an important factor in design DC High Voltage.
C-
C-
b-
Generator
a- because it is the most important factor in design consideration.
b- Because the cost is increased as ( Vbin ) increased.
C- Because it is related to space and size of DC High Voltage Generator.
d- All these reasons are right.
6- If the nominal ( L-G) voltage is 76.21 kv, the maximum ( L-L): voltage will be
a- 186.67 kv.
b- 131.999 kv.
C- 145.2 kv.
d- 93.33 kv
7- If we have a multi - stage impulse generator with a highest charging voltage (Vmax)
of 200KV & a discharge capacitance of the generator ( Cg) of 1 microfarad. If we
need to generate a high voltage of 7.07107 MV (r.m.s): 1) What is the number of
stages? 2) What is the ? energy of this generator
a- 4 stage, 200 KJ.
b- All these answers are wrong.
C- 5 stage, 200 KJ.
d-50 stage, 20KJ
8- B.I.L must be less than B.P.L by .25%
a- Right.
b-
Wrong](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F75ebddc1-e0ae-4a03-a19b-be7c989c8df1%2F1ca107f1-0a0b-4292-af23-29fe3ab5fa53%2Fxojaa2_processed.jpeg&w=3840&q=75)
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