Deepakkumar Yadav
Burden on CT Q. Define CT burden Impedance of secondary circuit is expressed in ohms and power factor. It can be expressed as apparent power and rated secondary current at specified power factor. This power factor is not the power factor of the secondary load. The circuit connected the secondary winding is termed as burden … Read more
Flood lighting Application It means flooding large surfaces with light from powerful projector uses : Public places Ancient building. Monuments Religious places, building, churches, temple Festival occasions, etc. Gardens Forts Railway yards Sports stadium Car parks Construction sites Queries Industrial campus Commercial buildings. Advertising boards Show cases Hoardings Posters Exhibition
Factors for Designing the Schemes as a General Lighting (General Requirements) Area to be uniformly illuminated. Illumination level in LUX is to be decided. Shadows and glares to be pre-thought and how these can be avoided. Mounting height from the working plane and spacing between the lamps be decided. Space to height ratio is importance. … Read more
Illumination Level for Flood Lighting Areas Illumination in Lux Landscapes 50 – 150 Construction work 40 – 60 Excavation work 10 – 20 Parking 5 – 10 General campus lighting for watching 2 – 5 Quarries 20 – 25 Decorative and specular effects 100, 200 Sign boards advertising 100 – 300 Water tanks … Read more
Flood Lighting Q. State any four specific requirements of flood lighting. Meaning of Flood Lighting Its meaning is, copious artificial light projected many directions, eliminating all the shadows on the surface illuminated. Applications of Flood Lighting Flood lighting is used to illuminate various surfaces of various categories like (a) Aestetic (b) Industrial and … Read more
Q. Important Definitions Define Townsend’s first and second ionization constant. How the condition for breakdown is obtained in a Townsend’s discharge? Primary Ionization It is the process of liberation of free electrons from gas molecules with simultaneous production of positive ions due to collision with free electrons. Townsend’s Primary Ionization Coefficient (α) It is number … Read more
Practical Considerations in using Gases for Insulation Purpose Air has great advantage of being low in cost, therefore it found some application at increased pressure in condensers, cables and other insulation constructions. But it does not satisfy the second requirement, since ionization of air is accompanied by emission of ozone, nitrous and nitric oxides causing … Read more
Gases as Insulating Medium Gases used as insulation must satisfy the following basic requirements Gas must be chemically inert and should not react with dielectrics, in combination with which it is used, and with other materials used in the construction of the apparatus. During the ionization of the gas, which to a certain degree is … Read more
Control of Over Voltages due to Switching and Power Frequency (a) Energization of TL in or more steps by inserting resistances and withdrawing them afterwards It is normal practice to have a series resistance with the circuit breaker contacts during switching ON and then but short circuiting this resistance after a few cycles. (b) Eliminating … Read more
Distribution of Switching Surges (EHV and UHV Systems) Switching surges originate when there is sudden release of internal energy stored in the electrostatic form (in the capacitance) or in the electromagnetic form (in the inductance). This can happen in following situations : (i) Current chopping phenomenon : Interruption of magnetizing currents (transformers/reactors re switched … Read more