NTPC Internship

NATIONAL THERMAL POWER

CORPORATION Ltd.

A presentation on NTPC operations

By Mr. Aman Sharma (7th Sem-E&c)

PRESENTATION OUTLINE

1. About the Company

2. Evolution of NTPC

3. NTPC Today

4. NTPC Performance Highlights

5. Introduction To Thermal Power Plant

6. Functioning of Thermal Power Plant

7. Structure of Coal Power Plant

8. Operation

ABOUT THE COMPANY

NTPC, one of the largest company in India, was setup in 1975 to accelerate power development in the country. In the Forbes list of world’s 2000 largest companies for the year 2007, NTPC occupies 411th place.

NTPC has installed capacity of 29,394 MW.

89.5% owned by Govt. of India

FII own about 3% & rest 7.5% owned by domestic institution & public

EVOLUTION OF NTPC1975

• NTPC was set up in 1975 with 100% ownership by the Government of India. In the last 30 years, NTPC has grown into he largest power utility in India.

1997

• Government of India granted NTPC status of “Navratna’ being one of the nine jewels of India, enhancing the powers to the Board of Directors.

2004

• NTPC became a listed company with majority Government ownership of 89.5%. NTPC becomes third largest by Market Capitalisation of listed companies

2005

• Rechristened as NTPC Limited in line with its changing business portfolio and vision to transform from a thermal power utility to an integrated power utility.

2007

• First step towards Strategic diversification- the company decides to acquire 44.6% stake in TELK from Government of Kerala to manufacture and repair transformers etc.

2008

• NTPC is the largest power generation company in India. Forbes global 2000 for 2008 ranked it 411th in the world.

NTPC- Today

• One of the three largest Indian companies with market cap of Rs. 1788 billion

• Ranks 126th on the basis of market cap globally (Forbes 2009 data)

• Has a net worth of Rs. 574 billion

• Owns a total assets of Rs. 1052 billion

• Ranked # 1 independent power producer in Asia in 2008 (by Platts, a division of Mc graw-Hill companies)

• 5th largest generating company in Asia

• 317th largest company in the world (Forbes ranking-2009)

NTPC Performance Highlights

Introduction To Thermal Power Plant

Power station is an industrial facility for the generation of electric power.

In thermal power station, mechanical power is produced by a heat engine, which transforms thermal energy, often from combustion of a fuel, into rotational energy

Functioning Of Thermal Power Plant

Process of a Thermal Power Plant

In a Thermal power plant coal is used to heat the boiler to convert the heat into steam. The steam is used to turn a turbine, which is connected to a generator. When the turbine turns, electricity is generated & given as output by the generator

Structure of Coal Power Plant

OPERATION

• Introduction

• Control & Instrumentation (C & I)

• Electrical Maintenance Division II (EMD-II)

INTRODUCTION

The thermal power plant has steam turbine-driven

generators which has a collectively capacity of 705MW.

The fuel being used is coal which is supplied from

Jharia coal field in Jharkhand. Water supply is given from

Agra canal.

Sr. No. Capacity No. of Generators

Total Capacity

1. 210MW 2 420MW

2. 95MW 3 285MW

Capacity of Badarpur Thermal Power Station, New Delhi

C & I (Control & Instrumentation)

C & I Syastem keeps it’s eye on the following process:

• Boiler Performance Optimization

• Air heater tests and gap analysis

• Burner to burner PF balance tests

• Steam Turbine measurements

• Condenser Water Pressure

• Condenser Helium leak detector

• Cooling Tower performance

• Reliability Centered Maintenance

Monitoring & Alarm System

Most of the power plant’s operational controls are automatic. However, at times, manual intervention may be required. Thus, the plant is plant is provided with monitors and alarm systems that alert the plant operations when certain operating parameters are seriously deviating from their normal range.

Switchgear

The term switchgear, used in association with the electric power system, or grid, refers to the combination of electrical disconnects, fuses and/or circuit breakers used to isolate electrical equipment.

Switchgear is used both to de-energize equipment to allow to work to be done and to clear fault downstream

Switchgear

Functions:- One of the basic functions of switchgear is protection, which is interruption of short –circuit and overload fault circuits while maintaining service to unaffected circuits. Switchgear also provides isolation of circuits from power supplies.

Safety:- To help ensure safe operation sequences of switchgear, trapped key interlocking provides predefined scenarios of operation.

High Tension Switchgear

High voltage switchgear is any switchgear and switchgear assembly of rated voltage higher than 1000 volts used to connect or to disconnect a part of a high voltage power system. These switchgear are essential elements for the protection and for a safety operating mode without interruption of a high voltage power system.

EMD-II (Electrical Maintenance Division)

• Generator

• Transformer

Generator

The function of the generator is to convert mechanical power, delivered from the shaft of the turbine, into electrical power. The mechanical energy from the turbine is converted by means of a rotating magnetic field produced by direct current in the copper winding of the rotor or field, which generates three-phase alternating currents and voltages in the copper winding of the stator (armature).At Badarpur Thermal Power Station 3000 rpm, 50 Hz generators are used of capacities 210 MW and 95 MW.More energy is transmitted to the generator from the turbine, in the form of a torque. The higher the power output, the higher the torque between turbine and generator.

Stator & Rotor

Stator:- The stator winding is made up of insulated copper conductor bars that are distributed around the inside diameter of the stator core, called the stator bore, in equally spaced slots in the core to ensure symmetrical flux linkage with the field produced by the rotor.

Rotor:- The rotor winding is installed in the slots machined in the forging main body and is distributed symmetrically around the rotor between the poles. The winding itself is made up of many turns of copper to form the entire series connected winding. All of the turns associated with a single slot are generally called a coil. The coils are wound into the winding slots in corresponding positions on opposite sides of a pole.

Transformer

A transformer is a static electrical device, involving no continuously moving parts, used in electric power systems to transfer power between circuits through the use of electromagnetic induction.Transformers are exclusively used in electric power system to transfer power by electromagnetic induction between circuits at the same frequency, usually with changed values of voltage and current.In Badarpur Thermal Power Station, the transformer application involves the transmission and distribution of electrical power.