Deepakkumar Yadav
Power Semiconductor Devices The power semiconductor devices can be divided broadly into five different types as shown in chart. Out of these devices the Silicon Controlled Rectifier (SCR) was the first device to be developed in 1957. The other semiconductor devices became available after 1970. 1. Power semiconductor (a) Power diodes (b) Thyristors (i) SCR (ii) GTO (iii) RCT … Read more
Application Areas of Power Electronics Q. What the various power electronic are applications? Explain in brief any two of them. Some of the important applications of power electronics are : Heat control (induction heating). Power supplies (for aircrafts), battery chargers. Vehicle propulsion systems. Conveyors, cranes and hoist control. Electric vehicles. Locomotives, mass transit. Air conditioning, … Read more
Induction Voltmeter Its construction is similar to that of an induction ammeter except for the difference that its winding is wound with a large number of turns of fine wire. Since it is connected across the lines and carries very small current (5-10mA), the number of turns of its wire has to be large in … Read more
Properties and Applications of Ferromagnetic Materials Ferromagnetic materials having low retentivities are widely used in power and communication apparatus. Since silicon iron has high permeability and saturation flux density, It is extensively used in the magnetic circuits of electrical machines and heavy current apparatus where a high flux density is desirable in order to limit … Read more
Introduction to Power Electronics In the recent past, the power electronics has radically modernized the concept of power conversion and the control of electric motor drives. The word Power Electronics is a combination of three terms namely power, electronics and control. Power : Power is the term related with the generation, transmission and distribution of … Read more
Voltage or Potential Transformer Q. State the specifications of PT as a protective transformer. Voltage transformers (potential transformers) are used for measurement and protection. They may be either single phase or three phase units. Voltage transformers are necessary for voltage, directional, distance protection. Primary of voltage transformer is connected to power circuit between phase and … Read more
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