Engineer Power Plant

Rishi Kumar Sinha

B-** Kalpvruksha Housing Society

Koba, Gandhinagar, Gujarat, 382007

Cell: 009***********

Email: ********@*****.**.**

Educational Qualification:

Bachelor of Engineering (Electrical Engineering)

Madan Mohan Malviya Engineering College, Gorakhpur, Uttar Pradesh, India with First division in July- 1991.

Objective:

Power Electronics Engineer with the ability to analyze complex engineering problems, evaluate and recommend alternatives and communicate recommendations

effectively seeking a job in an engineering industry.

Key Summary of work experience

1. All type of engineering calculations in relation to HVDC system. E.g.12 Pulse Thyristor Valve group, DC-DC Chopper (Buck, Boost and Fly back),

Cockcraft voltage Multiplier, AC/DC and DC/AC converter system, Reactive Power Compensation System,Harmonic Suppression Filter, PID controller, fault

and transient analysis using compatible Software tools etc.

2. Design, Development, Sizing Calculation, Fault Investigation, SLD, Control Schematics and Documentation of Power Plant and Substation equipments as

shown below:-

EHV substation, Dry type excitation transformer, unit and station auxiliary starter panel, HT & LT panel, Underground cable, Static Excitation

Equipment.

Employment Record:

1. Current Employment:

I am presently working with Institute for plasma research, Bhat, Gandhinagar (An autonomous body of department of atomic energy, Government of India)

in the capacity of Visiting Engineer from 7th Dec 2011 and working on Design project of 200 kV & 1 Million volt D.C power supply.

Details of previous employments:

2. Electrical Engineer (Level 5): from 28th April 2010 to 7th April 2011, United Kingdom Atomic Energy Authority Oxford shire, United Kingdom OX14 3DB

• Design and development of ohmic coil voltage modulation system that includes detailed engineering of a new scheme to enable thyristor make switches to

periodically turn ON and OFF at given frequency of 10 Hz.

• Prepared a project report on mechanical key interlock system to establish new set of rules to access various H.V areas of the plant in safe condition.

• Modified the existing reactive power compensation system (50 MVAR on 36 kV bus) from its original voltage feedback mode to actual reactive power demand

mode of operation.

• Design and engineering of a new system from scratch of control cubicle for 3 stage air compressor including protection, interlocking and signal

monitoring of a high pressure pneumatic system.

3. Deputy Manager: from 11th Aug, 2008 to 31st March, 2010, Tehri Hydro Development Corporation Ltd.

• Validation and modification (proposed) in control scheme of static excitation equipment.

• Selection of equipments and their rating those are used in 400 kV switch yard e.g. L.A, Isolator, Earth switch, Circuit breaker, CT/VT, Transformer,

Grounding resistance, Bus bars, Gas insulated & bus duct.

• Detail engineering of control and protection scheme of other power Plant equipments.

• Validation of control scheme of data acquisition & monitoring cubicle of central monitoring system.

• Design and engineering of first hand standard protections of main generators.

• Detail design of protective relays and their interfacing with Generator transformer.

4. Engineer Scientist – E: from 7th Dec 1995 to 7th Aug 2008, Institute for Plasma Research under department of atomic energy, Gandhinagar, Gujarat

Job responsibilities

4.1 SELECTED CAREER ACCOMPLISHMENTS

• Extra D.C over current protections were provided in each power supply system to make the D.C drives more protected and safe which were not originally

in existing scheme.

• Designed, procured and testing of a new set of coil for 11th order and 13th order harmonic suppression in L-C tuned circuit of reactive power

compensation bank.

• Redesigned the heat sink module coupled with main thyristorised converter system assembly.

• Accomplished the design of zero crossing reactor in Aux converter (dual Converter) power supply and implemented the same in the system when the

Converter current falls from (+) to (-).

• New snubber/damper circuit was designed and installed at site to prevent the convertor rectifier system from the threat of large dv/dt.

• Design, development and installation of extra capacitor in vertical field circuit for faster current rise in the V.F coil as required by the experiment

demand.

• Integrating new electronics in T.F control circuit to ramp down the coil current gradually during last leg of shot /pulse after plasma current ends.

• Accomplished the project task to replace the PLC (6 Nos), Hall CT (2 Nos) and Converter transformer relays. This includes procurement, installation,

testing and documentation of each device.

• Assisted the tasks related to development, support, documentation and design of +/- 2.5 kA current regulated transistorized inverter power supply.

4.2 PROFESSIONAL EXPERIENCE

• Preventive, predictive and corrective maintenance of converter transformer, 11 KV panel,line commuted Rectifier, vacuum circuit breaker fast make

switch and discharge breaker.

• Broad view of safety and interlock action of pulsed power supply system, which includes data acquisition and control as well.

• Supporting effective risk management and identification.

• Complementing the interface between safety system and interlock system.

• Management of numerous interlocks in pulsed power supplies system.

• Generation of new alarm and protection in power supply in auto and manual mode.

• Coordination of various groups and their interlocks with center control system.

• Created new protection/safety interlock in D.C drives.

• Clear understanding/fundamentals of analog I/O and digital I/O & timer out Signal of various hardware modules of computer followed by their management•

and maintenance as well.

• Over all view of digitization of analog in signal with certain sampling rate and given resolution bit to view the profile of series of

events/diagnostics on computer.

• Supporting the transmission of analog signals using different types of transducers for computational purposes.

• Synchronization of generation of 12 pulses from thyro pulse system for the converter rectifier on the basis of error signal (; control voltage) and

synchronizing voltage.

• Implementing the synthesis of transfer function based upon requirements and checking the system stability.

• Interfacing the status monitoring signals by PLC and the complementary system.

•Integrating all the possible faults together and finally triggering the tripping circuit.

•Interaction of detection of close loop control faults.

•Integration of current signal obtained from Hall CT and further processed in to the power supply controller/regulator.

•Operation of 500 microfarad, 29 kV cap bank and 1 mega joule resistance bank.

•Operation and maintenance of high current carrying D.C isolator.

4.3 SKILL SUMMARY

• Converter transformer: special purpose pulse duty large MVA rating with regular protection schme.

• Converter/rectifier: 12-pulse thyristorized bridge rectifier, snubber circuit for spikes/large dv/dt protection, Saturable inductor for di/dt

protection, 2 KA fuse, heat sink, isolation transformer, TI fuses along with indicating and tripping circuit card and large rating Power Diodes.

• Hall CT: up to conversion ratio 60 KA/10 volts

•Control system: PLC, Controller card, protective relay card, monitoring card, various interlocks, aux power supply, and display system.

• PF improving and harmonic suppression bank: 25 KVAR & 11 KV cap bank Suitable size inductor etc.

• Ignitrons, D.C vacuum circuit breaker and commutation circuit, fast make switch,

• Computer Knowledge:

o Operating systems: Windows 2000/XP, Linux

o Office Tools: Microsoft Office, MS PowerPoint

o I/O Cards: Digital Input/output, Analogue Input/output, and Timer/Counter.

o PSIMM, Matlab

5. Assistant Engineer: from 21-09-1992 to 20-11-1995, The National Industrial

Development Corporation Ltd. New Delhi.

• Internal and external electrification of Navodaya Schools of Maharashtra.

• Internal wiring of a residential cum school building.

• Fixing of luminaries Fans, fixtures, main switchboard etc were also part of job.

• External electrification covers installation, testing and commissioning of 11 kV sub station and street lighting, L.T panel, underground cable and

distribution line.

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