Date post: | 30-May-2015 |
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Engineering |
Upload: | idc-technologies |
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Technology training that works
Switchgear and Distribution Systems
Technology Training that Workswww.idc-online.com/slideshare
Topics
• History and growth of power distribution
• Typical characteristics of a power distribution system
• Main components of a distribution system
• Main equipment in a distribution system
• Electrical safety and power security
Technology Training that Workswww.idc-online.com/slideshare
Governing principles of Power Distribution
• Safety of operating personnel and plant assets
• Reliable power supply (continuity of power)
• Adequate quality of power
• Prevention of load generated problems
Technology Training that Workswww.idc-online.com/slideshare
Consumers’ responsibility
• No power system is 100% trouble-free• Consumer should know supply behaviour and parameters• Preempt problems by proper design and selection of consumer
owned equipment• Minimise adverse impact on power supply system
Technology Training that Workswww.idc-online.com/slideshare
History and growth of power distribution
• ac vs. dc
– Edison vs. Tesla (backed by Westinghouse)
• ac won out because of several benefits
– Higher efficiency of transmission
– Minimises voltage drop
– Transformation of ac voltage is easy
• First ac installation in Niagara Falls in USA
Technology Training that Workswww.idc-online.com/slideshare
Benefits of 3-phase ac power system
• Higher power output for a given size of motor
• Better conductor economy per unit power
• Self starting induction motors
• Better synchronising torque makes parallel operation of alternators possible
Technology Training that Workswww.idc-online.com/slideshare
Connection configurations of source and load
Technology Training that Workswww.idc-online.com/slideshare
Connection configurations of source and load
Technology Training that Workswww.idc-online.com/slideshare
Connection configurations of source and load
Technology Training that Workswww.idc-online.com/slideshare
Connection configurations of source and load
Technology Training that Workswww.idc-online.com/slideshare
Types of power distribution
• Utility– Dispersed loads– Mix of large and small loads
• Residential (domestic)– Small, perhaps single phase– Daily and seasonal load cycle
• Buildings (commercial/business premises)– Similar in nature to domestic but different daily cycle
• Industrial– Larger loads concentrated in a small area– Load fluctuations and load generated problems
Technology Training that Workswww.idc-online.com/slideshare
Industrial distribution components
• An incoming section • In-plant emergency/standby generation and associated
distribution system• A primary distribution system, usually medium/high voltage • A step down transformer section • A secondary low voltage distribution system• Control gear for individual loads• Supervisory control system
Technology Training that Workswww.idc-online.com/slideshare
Main equipment types• Circuit isolation devices• Circuit switching devices (circuit breakers)• Transformers• HV and LV distribution equipment• Motor control panels• DC supply system • Power system protection • Cable (or overhead line based) distribution systems• Earthing system• Power quality improvement equipment
Technology Training that Workswww.idc-online.com/slideshare
Electrical safety and power security
• Electricity-a good servant but a bad master
• Safety is a predominant issue
• Legislative requirements
• Standards for ensuring quality and reliability
• Good O&M practices to ensure power security
Technology Training that Workswww.idc-online.com/slideshare
DO YOU WANT TO KNOW MORE?
If you are interested in further training or information, please visit:
http://idc-online.com/slideshare