AN INDUSTRIAL INTERNSHIP PRESENTATION

RAJASTHAN RAJYA VIDHYUT UTPADAN NIGAM LIMITED MAHI HYDEL POWER HOUSE-1, BANSWARA

Presented By:-

Jayant Joshi12ME001649

Department of Mechanical Engineering

SIR PADAMPAT SINGHANIA UNIVERSITY, UDAIPUR

INTRODUCTIONMAHI HYDEL POWER STATIONS

Project Name: Mahi Bajaj Sagar

Project By: Govt. of Rajasthan And Gujrat states

Dedicated By: Prime Minister Indira Gandhi in January, 1983

Dedicated to Nation: February 1986

Dam Catchment Area: 6149 sq. km

Active Capacity of Dam: 2,070 MCM at FRL of 280.75 m and the MDDL of the project is at 259 m.

Power Capacity: 140MW(2*25 & 2*45)

MAHI HYDEL POWER HOUSE-1

Specifications:-Capacity of machines 2 x 25 MW

Type of turbine FRANCIS TYPE [VERTICALSHAFT]

Date of commissioning of Unit I 22-1-1986

Date of commissioning of Unit II 06-2-1986

Date of dedication of Nation 13-2-1986 Types of generator UMBRELLA Type.

Capacity of generator 27.778 MVA. At 11 kV,50 Hz

Rated Speed 150 rpm. Turbine output at rated head of 40m 25.825 MW.

Capacity of power transformer 11/132 kV,31.5 MVA, 3-Ø. Diameter of Penstock pipe 4.2m Length of Penstock pipe 90m Length of Tail Race tunnel 1462m Tail Race level max. (from sea level) 238 m

Tail Race level min. (from sea level) 231 m

Capacity of Reservoir (at 281.5 m) 80 TMC

TURBINE:-1. Type of Turbine Francis Vertical Shaft

2. Net Head Max.- 50.0 m Rated- 40.0 m Min.- 26.0 m

3. Outputs Max. Output of Turbine at Designing- 28.40 MW Rated Output of turbine at design Head- 25.825 MW

4. Speed of Rotation Synchronous- 150 rpm Direction- clockwise when viewed from generator end

5. Discharge At rated head and max. output- 80.55 m3/sec At rated head and rated output- 71.1m3/sec

Methodology:- Penstock: It is a large size conduit which conveys water from the upstream to the dam/reservoir to the

turbine runner. Spiral Casing: It constitutes a closed passage whose cross-sectional area gradually decreases along the

flow direction; area is maximum at inlet and nearly zero at exit. Guide Vanes: These vanes direct the water on to the runner at an angle appropriate to the design, the

motion of them is given by means of hand wheel or by a governor. Governing Mechanism: It changes the position of the guide blades/vanes to affect a variation in water

flow rate, when the load conditions on the turbine change. Runner and Runner Blades: The driving force on the runner is both due to impulse and reaction effect.

The number of runner blades usually varies between16 to 24. Draft Tube: It is gradually expanding tube which discharges water, passing through the runner to the tail

race.

Working of TurbineParts of Turbine

BEARING:- Thrust bearing type –

Spring matters supported: (No. of pads – 8) Guide bearing type –

Pivoted type: (No. of pads – 18) Normal operating temperature of bearing pads: 60°c

Guide Bearing Thrust Bearing

Methodology: Shaft and Guide Bearing Bracket- 1. Top Bracket 2. Brakes and Jacks Shaft And Thrust Bearing Block H.S. Lubrication for Thrust Bearing Shaft Sealing

GOVERNOR AND CONTROL EQUIPMENTS:-Specifications:

1. Type Electro hydraulic Governor G-40

2. Speed setting range 50+_5Hz

3. Gate setting range 0-100%

4. Permanent speed drop bp 0-10%

5. Temporary speed drop(off line)bt Governor sensitivity

0-100% 10-1000mA/Hz

GOVERNOR

Function of Governor:1. Load Variation 2. Load Rejection

Parts of Governor:1. Hydro-mechanical Cabinet2. Gate Limiter3. Electro-hydraulic Transducer

Electro-hydraulic Transducer

AUXILARY:-1. Pump: Specifications-

H.P. & L.P. Pumps

2. Compressor: (1.) H.P. Compressor (2.) L.P. Compressor

Air Compressor

3. Automatic Voltage Regulators:

4. Cooling Process: (1.) Water Sprinklers (2.) CO2 Sprinklers (3.) Ventilation (4.) Air Cooler (5.) Oil Cooler

Oil feeding for Cooling

AC GENERATOR:-Parts: 1. Stator 2. Rotor 3. Permanent Magnet Generator 4. Collector Rings and Brush gears

Insight of Generator

TRANSFORMER:-Construction:

Current Transformer:

Power Transformer:

Lightning Arrestors:

MAINTENANCE OF HYDRO POWER PLANT:-1. Water Seal and Oil Seal2. Turbine Guide Bearing3. Top Cover Drain System4. Centralized Grease Lubrication System5. Hydro-mechanical Cabinet of Governor

CONCLUSION

In conducting the project study in an industry, students get exposed and have knowledge of real situation in the work field and gains experience from there. The object of the summer training project is to provide an opportunity to experience the practical aspect of Technology in any organization. It provides a chance to get the feel of the organization and its function.

In Hydro power plants, the potential energy of water is utilized by the turbine to rotate coil at high torque. The torque so produced is used in driving the coil coupled to generators and thus in generating Electrical Energy.

I have privilege taking my practical training at " MAHI HYDRO POWER HOUSE - I " where power generation takes place in bulk. The fact that Hydro energy is the major source of power generation itself shows the importance of Hydro power generation in India.

This training proved an opportunity for encounter with such huge machines like hydro- generator ,transformers etc. The architecture of Hydro power plant way various units are linked and the way working of whole plant is controlled make the students realize that

Engineering is not just structural description but greater part is planning and management. It provides an opportunity to learn tech. Used at proper place and time can save a lot of labour. However, training has proved to be satisfactory. It has allowed us an opportunity to get an exposure of the practical implementation of theoretical fundamentals.  

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