Week-08 - Transformer Assembly-Threephase

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Week-08 - Transformer Assembly-Threephase

1.Circuit Breaker – Meaning, Classification of Circuit Breakers, list the types -LV, HV types with applications. Explain the terminologies – Circuit Breaker Rating, Arc-Voltage, Arching Time, Pre –Arcing Time, Prospective Current, TRV, Recovery Voltage, RRRV, Total Break Time, Making current, Breaking current, Short circuit rating and Short-time current rating. Construction, working principle and applications of ELCB, RCCB, MCCB and MPCB. Concept of ACCL (automatic changeover with current limiter). MCB- Types, Classification based on trip curves and their application, General construction and working, Characteristics of MCB.

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Darul Amal Chishtia

Zagor LIB KB 53 - Zelena opasnost.pdf

Stripovizijacom

VC - Dylan Dog - 125 - PAKLENI POSAO

Stripovizijacom

Zagor blago iz grada duhova (extra 288)

Stripovizijacom

Witch #31

witchblog oficial

Monthly Khazina-e-Ruhaniyaat August'22 (Vol.13, Issue 4)

Darul Amal Chishtia

TTF.MTMTE.54

Arcee327

Hizb 56steka36

Hizb 43steka36

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PremanandDesai

TTF.MTMTE.47

Arcee327

Hizb 10steka36

Monthly Khazina-e-Ruhaniyaat Mar’2021 (Vol.11, Issue 11)

Darul Amal Chishtia

Witch #27

witchblog oficial

Monthly Khazina-e-Ruhaniyaat Jun'21 (Vol.12, Issue 2)

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Monthly Khazina-e-Ruhaniyaat Sep'21 (Vol.12, Issue 5)

Monthly Khazina-e-Ruhaniyaat Apr'22 (Vol.12, Issue 12)

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VC - Dylan Dog - 125 - PAKLENI POSAO

Zagor blago iz grada duhova (extra 288)

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Hizb 43

Week-01 - INTRODUCTION to CAD

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WEEK- 06/ UNIT – 06 Transformer Protection 1a. Explain Abnormalities & List different types of Faults. 1b. Construction and working of Circulating Current Scheme for Transformers Protection. Construction and working of Earth Fault or Leakage Protection Systems for Transformer. Construction and working of Buchholz Relay. 3b. Transformer oil – Electrical properties, desired properties and applications of Transformer oil , BDVT.

Week 05 Switchgear and Protection

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1a. Block diagram and working of Microprocessor/ Microcontroller based Overcurrent Relay. 1b. Causes of over voltages and under voltages, Effects of OV/UV. Construction, working and application of Static relays- OV/UV relay and OCR relay. 2b. Lightning arresters & surge absorbers - Construction and principle of operation.Construction, working and applications of Numerical Relays. Comparison of Static Relays with Electro-Magnetic Relays and microprocessor/microcontroller-based relays. Concept of Multifunction Protection numerical Relays.

Week 04 Switchgear and Protection

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Switchgear and Protection Meaning of Switch gear, Types-Indoor type and Outdoor type, Essential features of Switchgear, List most commonly used Switchgear equipment and Protective Devices for switching and interruption of current. Importance of power system protection and Necessity of Protective Devices. Sources of Faults, Types of faults, Harmful Effects of short circuit current, Symmetrical and unsymmetrical faults on three-phase systems. Sources of Faults, Types of faults, Harmful Effects of short circuit current, Symmetrical and unsymmetrical faults on three-phase systems.

UNIT - 06 TRANSMISSION LINES AND SUBSTATIONS

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Code of practice for Transmission lines and substations, transmission line materials and their specifications, types of Towers, ACSR conductors and Number of Disc insulators in suspension string, strain string, span and height of towers for 66 KV, 110 KV, 220 KV transmission lines, concept of single circuit and double circuit transmission lines, method of calculating the Quantity of transmission line materials, Prepare the schedule of materials (only) for 66 KV,110 KV and 220 KV single circuit transmission lines. 66KV/11KV, 5 MVA Substations- Single Line diagram, list of Electrical equipment's/ materials (only) and their specifications.

UNIT - 05 DISTRIBUTION LINES AND TRANSFORMER CENTRE

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Code of practice for Distribution Lines and Transformer centre, types of transformer centres - Pole mounted, plinth mounted, indoor and outdoor types. Determining the rating of Distribution Transformer. Write Specifications of the Distribution Transformer. Draw the SLD of a Transformer centre indicating the size of protective devices, Prepare the schedule of equipments /Materials with specifications for a 11KV/415V,100 KVA transformer centre and their estimates, 415 V LT line materials and specifications , method of calculating various LT line materials (only). Prepare the schedule of materials (only) for 3 phase 4 wire LT line, 11 KV HT Line-materials and their specifications, method of calculating various HT line materials and tapping structure, TOPO sheet and its use, Concept of combined estimates. Prepare the schedule of materials (only) for 11 KV single circuit HT line for Rural Electrification. (Note: HT lines over head type only)

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Code of Practice for Power Installations, materials required for power circuit wiring and their specifications, Prepare the layout diagram of machines showing clearances as per IS standards, draw wiring plan of the Power circuit for workshops, Decide the type of wiring system, load calculations, determine the size of conductors, main switch, Isolators, sub switches and protective devices, Draw the SLD of Power Distribution Scheme showing grading/discrimination of ratings of protective devices, Prepare the schedule of materials with specifications for workshops and their estimates, Determine the rating of motor for IP set and the concept (only)of pump house wiring.

UNIT - 03 LIGHTING INSTALLATION

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Interior Wiring types and their applications, factors to be considered while selecting the type of wiring system, materials required for Interior wiring and their specifications, Code of Practice for Lighting Installations, method of deciding the number of sub-circuits, calculating the quantity of wiring materials and accessories for the Interior Wiring, load calculations for a residential buildings, size of conductors, main switch, sub switches and protective devices. Draw wiring plan for AEH Installation, concept of horizontal run, vertical rise and vertical drop. Prepare the schedule of materials for providing lighting and heating circuits and their estimates. Procedure for converting lighting to AEH installation.

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