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Questions related from syed taha Ahmed
We have 3 buses at our generating units. Bay3,4,5. Bay 3&4 is connected with grid and Bay 5 is at radial load. Now due to heavy load connected at bay 4 sometimes it trips on overcurrent . As...
21 July 2023 5,855 0 View
At high vacuum saturation temperature corresponding to vacuum drops which means more heat rejection but how this effect cooling water temperatures. As cooling water now have to absorb more heat
17 June 2023 518 3 View
SIL is define as when transmission line loaded with Impedance equal to its Surge Impedance ignoring Resistance and conductance. When Surge impedance is equal to load impedance the sending end and...
02 April 2023 1,830 1 View
During short circuit what would happen to load angle before breaker opening. 2) During normal operation if one increases field current the load angle decreases but what is the lower limit of...
02 March 2023 1,860 1 View
2 pole alternator is at 3000 rpm at 50 hz frequency now the grid frequency changes to 50.5 hz that will accelerate the rotor. Rotor cannot be instantly raise to match the speed. So how much time...
29 November 2021 9,126 1 View
Suppose my gas turbine is connected to grid, its frequency is dictated by grid. Freq decreases because as soon as extra load is added the rpm drops and stored rotational energy serves the...
17 October 2021 3,986 4 View
In my neighborhood once there was a event that causes much damage to electrical appliances. The red phase conductor peeled of and the peeled section of wire touched the yellow phase when wind...
26 September 2021 7,418 1 View
For ∆-Y power transformer Y-∆ CT connection is used. The Low voltage side is connected is connected with Current transformers that are star connected . Why this cross connection is done and how...
09 March 2020 1,508 7 View
Lets say the grid is at ideal frequency 50 hz then the large load is shut of due to which frequency increases beyond 50 which tends to rotate all turbines faster than their previous speed but at...
04 September 2019 8,759 2 View
line charging current breaking current limit of HV breakers are low as compared to short circuit breaking current whats the reason behind this. Why capacitive current breaking capacity is...
28 December 2018 442 2 View
I am working in PV systems and i need to design a AC wire resistence calculator that gives me AWG and cmills for particular values of load and allowable voltage drops but in all calculations i...
06 December 2017 1,306 0 View
I am curious for many days that if i have a very thick sheet between very weak magnetic field say horseshoe magnet or electric field so flux would pass through them completely or gets block...
23 October 2017 6,286 7 View
Copper when expose to external magnetic field unlike ferromagnetic material it does not allign or interect with field as ferromagnetic material do thats why copper is diamagnetic. So why change in...
23 October 2017 1,714 4 View
I want to know why the model behaviour is very close to original structure and why we dont lumoed capacitence only in one side. Put more than two capacitence lump on model.
22 May 2017 8,199 1 View
In AVR we normally use 4 registers named as GPRS , Special Purpose Registers, Programe counter Registers , Status Registers? Are they inside CPU or they are inside RAM? What are the addresses...
25 September 2016 9,496 6 View
My question is very simple Why low voltage or voltage fluctuation cause non motor load to burn like filament bulbs , energy saver bulbs? In low voltage how does we the current increases for non...
30 July 2016 6,184 5 View
What are Detuned Reactors and why they are used in Power Factor Correction devices.I have found in Schneider Electric website that that they are inductors which are use to control harmonics but...
27 July 2016 5,578 2 View
Is it against the law of diffusion? holes and electron carriers
04 April 2015 929 3 View
At low lagging power factor current increases but what happens to impedance it increases or decreases 1 Consider an ideal resistive circuit if it is supplied by AC voltage its power factor remain...
01 January 1970 2,895 4 View
I am sorry to ask this elementary question but i have some doubts that were not cleared during my undergrad days. I will try to present my doubts in following points. 1 At t=0 , there is no...
01 January 1970 9,605 1 View
Lets say there are more than one alternator connected parallel. All of them are operating at base load. 75*4=300 MW) . If the load is increased say (320 MW) governor cannot increase fuel as it is...
01 January 1970 8,622 3 View
Synchronous generator speed is set by grid. Governor valve just adjust the torque. So how Frequency control plays an important role to avoid alternator loss of synchronism. Lets say alternator is...
01 January 1970 1,639 0 View
I am a trainee engineer in power plant. I am now days reading about HV circuit breakers nameplate data. 145 KV circuit breakers have following data in their nameplate Short circuit making...
01 January 1970 357 0 View
