--- title: "Powerhouse components by functional use" subject: "Hydropower Engineering" chapter: 8 key: "semester_7/hydropower_engineering:powerhouse-components-functional-use" source: https://www.bctengineer.com/q/semester_7/hydropower_engineering/powerhouse-components-functional-use site: BCT Engineering --- # Powerhouse components by functional use Hydropower Engineering · Chapter 8: Powerhouse - Asked in: 2080 Baishakh - Video: [Hydro power plant, Parts of Hydro plant, Components of Hydro plant #HydroPlant #PowerPlant](https://www.youtube.com/watch?v=3ixtdPORwsw) — Mechanical Engineering Management - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_7/hydropower_engineering/powerhouse-components-functional-use - Whole chapter: https://www.bctengineer.com/md/semester_7/hydropower_engineering/chapter-8 ## Question Describe the components of a power house in a hydropower plant based on their functional use. ## Short answer Powerhouse components group by function: water passage (penstock, valve, spiral casing, draft tube), energy conversion (turbine, generator, governor), electrical control (transformers, switchgear, control room), auxiliaries (cooling, drainage, air, fire), handling (EOT crane, erection bay, workshop), and structure (substructure, floors, superstructure). ## Answer The parts of a powerhouse are grouped by what they do. #### 1. Water passage (hydraulic) parts - **Penstock and main inlet valve** bring water to the machine and allow isolation. - **Spiral casing, stay ring and guide vanes** distribute the water to the runner. - **Draft tube and tailrace** discharge the water after the runner, recovering head. #### 2. Energy conversion parts - **Turbine and shaft:** convert water energy to mechanical energy. - **Generator and exciter:** convert mechanical to electrical energy. - **Governor and oil pressure unit:** control speed by moving the guide vanes. #### 3. Electrical and control parts - **Transformers, switchgear, busbars and switchyard:** step up and transmit power. - **Control room, relays, instrumentation, batteries and cables:** monitoring, protection and operation. #### 4. Auxiliary services - Cooling water, drainage and dewatering, compressed air, lubricating oil, fire protection, ventilation and lighting. #### 5. Handling and service parts - **Overhead travelling (EOT) crane and erection bay:** for installation and maintenance of heavy parts. - **Workshop, store, offices, staff rooms, access roads** and parking. #### 6. Structural parts - **Substructure** (foundation, draft tube concrete), **intermediate floors** (turbine and generator floors) and **superstructure** (walls, roof, crane beams). ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. What does the governor and oil pressure unit do? A. Steps up the voltage B. Controls speed by moving the guide vanes C. Cools the generator D. Lifts the rotor Answer: B. The governor controls turbine speed by adjusting the guide vanes. (Key point: Governor function) 2. What is the function of the draft tube and tailrace? A. Distribute water to the runner B. Discharge water after the runner while recovering head C. Isolate the penstock D. Convert mechanical to electrical energy Answer: B. The draft tube and tailrace discharge water after the runner, with the draft tube recovering head. (Key point: Draft tube role) 3. Which pair correctly gives the energy conversion parts? A. Turbine converts water to mechanical energy; generator converts mechanical to electrical B. Turbine converts electrical to mechanical; generator converts water to electrical C. Transformer converts water to mechanical energy D. Exciter converts water energy to electrical energy Answer: A. The turbine and shaft make mechanical energy from water energy, and the generator makes electrical energy. (Key point: Energy conversion) 4. Which component belongs to handling and service parts? A. Spiral casing B. Overhead travelling (EOT) crane and erection bay C. Busbars D. Guide vanes Answer: B. The EOT crane and erection bay are used for installing and maintaining heavy parts. 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