Power Plant Engineering

380 POWER PLANT ENGINEERING and V = 60 πDN ∝ (^) H for prototype. ∴ From the above two equations, we can write DN dn H h or N n ...

HYDRO-ELECTRIC POWER PLANTS 381 ∴ 5/4 () NP H = 5/4 () nP h The capital notations are used for prototype turbine whereas the sma ...

382 POWER PLANT ENGINEERING The problems associated with the high speed turbines are the danger of cavitation and centrifugal fo ...

HYDRO-ELECTRIC POWER PLANTS 383 100 90 80 70 60 50 Efficiency 500 100 150 200 250 300 350 400 450 500 Specific Speed Reaction Tu ...

384 POWER PLANT ENGINEERING In case of Pelton wheel, only the jet diameter through which the water flows is reduced by the gover ...

HYDRO-ELECTRIC POWER PLANTS 385 8.Explain why the discharge conditions for a high specific speed runner are less favourable than ...

Chapter 12Chapter 12Chapter 12Chapter 12Chapter 12 Electrical SystemElectrical SystemElectrical SystemElectrical SystemElectrica ...

ELECTRICAL SYSTEM 387 The directions of flux, current and movement in generator and motor action are given in Fig. 12.1. The coi ...

388 POWER PLANT ENGINEERING Fig. 12.2. Conventionally Cooled Rotor Fig. 12.3. Arrangement of Conductors Fop. Direct Slot and Duc ...

ELECTRICAL SYSTEM 389 12.2.2 Stators Large stator housings comprise a series of annular rings flame-cut from steel plate, joined ...

390 POWER PLANT ENGINEERING insulated in many cases with bitumen-bonded micanite, wrapped on as tape, vacuum dried, then impreg- ...

ELECTRICAL SYSTEM 391 Air side Axial seal Shaft H side 2 Spring Oil Feed H side 2 Spring Radial seal Air side Fig. 12.10. Hydrog ...

392 POWER PLANT ENGINEERING Hydrogen cooling results in substantial increase in mW, rating for a given temperature-rise, and the ...

ELECTRICAL SYSTEM 393 12.3.1 Constructional Parts The transformer is a comparatively simple structure, since there are no rotati ...

394 POWER PLANT ENGINEERING Area % of (a) Square (b) Cruciform (c) Three-stepped (d) Four-stepped circum circle Gross 64 79 84 8 ...

ELECTRICAL SYSTEM 395 When core-clamping bolts are employed, stiffening or flitch plates are used to give the built-up core more ...

396 POWER PLANT ENGINEERING Fig. 12.16 show a shell-type transformer un- der construction. For core-types the clamps and flitch ...

ELECTRICAL SYSTEM 397 Core sections Joint Fig. 12.18. Small Cores for Grain-Oriented Steel. Constructional Framework. Considera ...

398 POWER PLANT ENGINEERING with double cotton covering. The coil is wound on a former with several layers of several turns per ...

ELECTRICAL SYSTEM 399 Insulation. The insulation between the h.v. and l.v. windings, and between l.v. winding and core, compris ...