INDUSTRIAL SEMINAR PRESENTATION
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This document provides a summary of Argha Dutta's industrial seminar presentation on the study and design of electrical power distribution systems. The presentation includes an overview of components like switchgear, transformers, motors, cables, and protective devices. It then describes the design process for a 33kV/6.6kV/415V power distribution system, including calculating transformer capacity, compensating for power factor using capacitor banks, sizing circuit breakers and cables. The presentation concludes with an overview of the single line diagram of the designed distribution system.
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INDUSTRIAL SEMINAR PRESENTATION
- 1. INDUSTRIAL SEMINAR PRESENTATION ON “STUDY OF VARIOUS ELECTRICAL EQUIPMENTS & DESIGN OF POWER DISTRIBUTION SYSTEM” ARGHA DUTTA 4th YEAR ELECTRICAL ENGINEERING ROLL NO - 129010093
- 2. A BRIEF OVERVIEW 33kv &6.6v air insulated switchgear Power transformer and accessories AC motors and controls Protective devices Cabling Eathing
- 3. CABLES: Types of power cables: PVC CABLES: 1.1 kV grade and have excellent electrical insulating properties. FRLS CABLES: Also known as flame reterdant low smoke cables and used in hazardous zones such as power plant , chemical plants. XLPE CABLES: These cables are a form of polyethylene with crossed links. They are suitable for working voltage of 240V to 500KV. APPLICATIONS: underwater cables , underwater burials.
- 4. EARTHING: Earthing includes UNEARTHED SYSTEM, SOLIDLY EARTHED SYSTEM, RESISTANCE EARTHING AND REACTANCE EARTHING. Earthing resistance Measurement: Two point Three point Fall of potential Four point TT connection – This type of connection is used in INDIA.
- 5. 33 kv and 6.6 kv air insulated switchgear • Three phase indoor floor mounted metal clad switchboard with air insulated bus bar. • Control voltage – 110/220V DC • Metal clad switchgear with steel sheet enclosure having degree of protection IP5X • Internal wiring consists of 1.1kV grade, 1 core stranded copper conductor, PVC insulated wire
- 6. DESIGN OF POWER DISTRIBUTION SYSTEM AND DEVELOPMENT OF SINGLE LINE DIAGRAM FOR 33KV/6.6KV/415V SYSTEM Selection of transformer is done on considering the following factors: Total working load Demand factor Power factor Diversity factor Margin for future expansion STEPS FOR CALCULATION: • First total working load is calculated • Then maximum demand is calculated. • Considering 20% spare margin minimum capacity of the transformer is calculated • Here in all cases ONAN cooled transformers with Dyn11 connections are considered.
- 7. POWER FACTOR COMPENSATION BY USING CAPACITOR BANK: Power factor compensation has been provided for improvement of overall power factors of the plant using CAPACITOR BANKS. Compensation has been considered both at LT side and HT side. STEPS FOR CALCULATION: • Active power P is calculated. • Additional power factor needed to be supplied for improvement of power factor is calculated by the differences of power factors of old and new reactive powers. • Installed capacity is approximated to the nearest value.
- 8. CALCULATION OF CIRCUIT BREAKER RATING AND CT RATIO OF HT FEEDERS The rated current is calculated and then it is approximated to the nearest standard ratings Standard rating of ACB available in the market are 630/800/1250/2500/3200A Standard rating of MCCB available in the market are 32/63/100/200/250/315/400A up to 1250A Selection of fuse rating for HT motors : First the load current is calculated, then the starting current of the motor is calculated which is usually 6 times the load current. Rated fuse current is then calculated from the reference chart.
- 9. SELECTION OF CABLE SIZE: In HT feeders the short time withstand duration have been selected as 0.5s for circuit breaker feeders and 0.02 seconds for vacuum contactor feeders. Three core cables are selected for HT system and 3–1/2 core cables are selected for LT systems. The required size of cables are selected from the chart available in the market.
- 10. AN OVERVIEW OF SINGLE LINE DIAGRAM: 33kv distribution system: power is received at 33kv from the 33kv switchboard of sending end substation. At substation 33kv outdoor equipment and indoor equipment is provided.it will be fed to 33/6.9kv transformers for delivering 6.6kv power. • 6.6kv distribution system: 6.6kV switchboard uses single bus system in which two incomers feed the two bus sections. 6.6kV HVMCC s are provided with two incomers , bus couplers with VCB and vacuum contractors.
- 11. TRANSFORMERS: Total 10 no of transformers are considered for the total plant area. POWER FACTOR COMPENSATION EQUIPMENT: Capacitor bank has been considered for compensation of power factor. Power factor is considered both for LT and HT system. In LT section reactive power compensation has been considered to reduce the reactive power component of power and thereby increases the power factor capacity through cable feeders.
- 12. THANK YOU…