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AC Supply System Presentation Transcript
1.AC Supply System
2.Presentation outline
Importance of Elect System for Auxiliary
Classification of Auxiliaries
Choice of Voltage for Aux
Aux. Power supply system
Emergency AC Supply
Importance of Elect System for Auxiliary
Classification of Auxiliaries
Choice of Voltage for Aux
Aux. Power supply system
Emergency AC Supply
3.Auxiliary Power Supply System
The purpose of an Electrical system is to generate and supply electrical energy .
The system should be designed and managed to deliver power with Reliability and Economy.
As these two requirements are quite opposed a balance is required to have an optimum design of Auxiliary power supply system
The auxiliaries have Ratings range from a few watts to few Mega Watts & Located over a large area
Work under varied Operating Conditions
The purpose of an Electrical system is to generate and supply electrical energy .
The system should be designed and managed to deliver power with Reliability and Economy.
As these two requirements are quite opposed a balance is required to have an optimum design of Auxiliary power supply system
The auxiliaries have Ratings range from a few watts to few Mega Watts & Located over a large area
Work under varied Operating Conditions
4.Auxiliary Power Supply System
Failure of Auxiliaries can cause Outage of Power Plant
Auxiliaries need Reliable Power Supply
System designed to cater to this need
Loads segregated on the basis of
Failure of Auxiliaries can cause Outage of Power Plant
Auxiliaries need Reliable Power Supply
System designed to cater to this need
Loads segregated on the basis of
5.Elements of Aux. Power System
More than 95% of the auxiliaries are driven by Motors
Different Voltage levels are interconnected through Transformers
Miscellaneous Elements
More than 95% of the auxiliaries are driven by Motors
Different Voltage levels are interconnected through Transformers
Miscellaneous Elements
6.Auxiliary Power Supply
List of Boards / Feeding Points arrived at based on Location of Load Centers / Systems
Quantity & Rating of Transformers calculated based on Load & Operational Requirements
Rating of Board Calculated based on the Operating Load & Transformer Rating
List of Boards / Feeding Points arrived at based on Location of Load Centers / Systems
Quantity & Rating of Transformers calculated based on Load & Operational Requirements
Rating of Board Calculated based on the Operating Load & Transformer Rating
7.MV Switchgears – System Parameters
8.LV Switchgears – System Parameters
9.Auxiliary Power Supply System
Sizing of Unit & Station transformer
Start up source short circuit power
Feeding offsite areas loads
Rating of the Switchgear
Loads
Power Supply arrangement
6.6& 0.415kV System
11 & 3.3 & 0.415kV System
Sizing of Unit & Station transformer
Start up source short circuit power
Feeding offsite areas loads
Rating of the Switchgear
Loads
Power Supply arrangement
6.6& 0.415kV System
11 & 3.3 & 0.415kV System
10.Auxiliary Power Supply INTRODUCTION
Commonly used voltage level up to 200 MW unit size- 6.6kV, 415V
Initially same voltage level (6.6 kv, 415v) were adopted for 500 MW unit size as well.
With 500 MW unit, quantitative and qualitative change in auxiliaries took place.
However no significant change in SWGR available in market.
Need for optimizing and cost effective solution
Commonly used voltage level up to 200 MW unit size- 6.6kV, 415V
Initially same voltage level (6.6 kv, 415v) were adopted for 500 MW unit size as well.
With 500 MW unit, quantitative and qualitative change in auxiliaries took place.
However no significant change in SWGR available in market.
Need for optimizing and cost effective solution
11.Aux. Supply system(500MW)
Grid Voltage- Normally 400kV for most of the200, 500MW units in India except few deviations
Any Intermediate Voltage Available-to provide reliable start-up power source and to meet initial commissioning activities as well as to supply bulk loads(CW system, make-up water etc.) away from the main plants.Generally used Intermediate voltage levels are 220kV, 132kV, 33kV
Nature of Auxiliaries i.e. ratings, basic characteristics and location
Grid Voltage- Normally 400kV for most of the200, 500MW units in India except few deviations
Any Intermediate Voltage Available-to provide reliable start-up power source and to meet initial commissioning activities as well as to supply bulk loads(CW system, make-up water etc.) away from the main plants.Generally used Intermediate voltage levels are 220kV, 132kV, 33kV
Nature of Auxiliaries i.e. ratings, basic characteristics and location
12.Auxiliary Power Supply-500MW
13.HT/LT Supply System
14.Transformer feeder Details
15.EMCC
16.From Unit SWGR ‘A’ Normally
17.USS ‘A’
18.USS ‘B’
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