Principle of Working of Variable Frequency Drive

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  • Topic: Electric motor, Variable-frequency drive, Direct current
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Report of Industrial Training

At

OIL and NATURAL GAS CORPORATION, RAJAHMUNDRY

Submitted by

ANUBHAV GOGOI
080906132

In partial fulfillment of the requirements for the award of the degree of

BACHELOR OF ENGINEERING
IN
ELECTRICAL AND ELECTRONICS ENGINEERING

DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
MANIPAL INSTITUTE OF TECHNOLOGY
(A Constituent College of Manipal University)
MANIPAL – 576104, KARNATAKA, INDIA

May 2012

[pic]UNDERGONE AT ELECTRICAL ENGINEERING SECTION
DRILLING SERVICES

OIL AND NATURAL GAS CORPORATION LIMITED
RAJAHMUNDRY ASSET

SUBMITTED BY SHRI ANUBHAV GOGOI
(THIRD YEAR STUDENT OF ELECTRICAL AND ELECTRONICS ENGG)

OF

MANIPAL INSTITUTE OF TECHNOLOGY, MANIPAL KARNATAKA.

SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE AWARD OF BACHELOR OF TECHNOLOGY IN ELECTRICAL AND ELECTRONICS ENGINEERING.

ACKNOWLEDGEMENT

I take this opportunity to express my gratitude to all the concerned people during my period of training at the facilities of ONGC, Rajahmundry Asset.

I am extremely grateful to Shri A S Rao, Supt. Engineer (Elect), Drilling Services for acting as my mentor. I also wish to express my gratitude to Shri S Chowdhury, DGM (Elect) for permitting the undersigned to undergo training in Electrical Section, Drilling Services.

ANUBHAV GOGOI.

STUDENTS DECLARATION

I hereby declare that the industrial training report conducted at various ONGC worksites, Rajahmundry and submitted to ONGC is in partial requirement for a Bachelor degree in Electrical and Electronics Engg at Manipal Institute of Technology is my original work and not submitted for the award of any other degree, diploma, fellowship or similar title of prize.

ANUBHAV GOGOI.

COMPANY PROFILE AND BACKGROUND.

Oil and Natural Gas Corporation Limited (ONGC) is one of the leading enterprises in the country. ONGC is an Exploration and Production (E & P) and operates through out India and several countries through its overseas arm ONGC Videsh Limited.

ONGC operates drilling rigs both onshore and offshore through India. In this industrial training report we concentrate basically on onshore land rigs and especially rigs operating in and around Rajahmundry, Andhra Pradesh.

Drilling Rig:
A drilling rig is a machine which creates holes in the ground. Drilling rigs are massive structures housing equipment used to drill oil wells and gas wells. A drilling rig is a complex of equipment used to penetrate the surface of the earth’s crust. Most modern drilling rigs are electrically powered with the electrical power generated by diesel generator units. A drilling rig generally has a generating capacity of approximately 4.0 mega watts. The main power consuming equipments on a rig are the draw works and mud pumps.

Electrical System of a drilling rig:

1. Power generation.

a. Electrical drilling rigs are outfitted with 600 volt oilfield alternators driven by diesel engines. The capacity of an oilfield generator varies 1215 and 1430 kva. A typical rig has three to four diesel generators for powering all the drives and other utilities.

2. DC motor drive system.

a. Each rig is fitted with a lifting system for handling the drill pipes and also for drilling. This done with a piece of equipment called a draw works. The draw works is powered by two 900 / 1000 hp DC motors. b. A mud pump is a reciprocating piston/plunger device designed to circulate drilling fluid under high pressure (up to 7,500 psi (52,000 kPa)) down the drill string and back up the annulus.

c. Mud pumps come in a variety of sizes and configurations but for the typical petroleum drilling rig, the triplex (three piston/plunger) mud pump...
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