• Sathruwan P.C

• Department of Electrical and Information Engineering

• University of Ruhuna

Industrial Training Presentation

From 04th January 2016 to 24th March 2016

CEYLON ELECTRICITY BOARD

Introduction to CEB Transmission Operation and Maintenance – Galle System Control Center Transmission and Generation Planning Branch Project and Heavy Maintenance Section – DD4 C.E.B. Southern province branch Laxapana power station Lakvijaya power station

Presentation Outline

Introduction To Ceylon Electricity Board

Major Divisions

Generation Transmission Distribution

Vision“Enrich Life through Power”

Mission“To develop and maintain an efficient, coordinated and economical system of electricitysupply to the whole of Sri Lanka, while adhering to our core values”.

Benefits of Effective Recruiting Introduction To Ceylon Electricity Board

Generation Transmission

Distribution

Transmission Operation and Maintenance - Galle

Matara Grid Substation 132 kV/ 33kV , 31.5 MVA Transformers The whole Grid Substation can be divided

into Line bay, Transformer bay and Feeder bay 4 Lines 12 Feeders

Transmission Operation and Maintenance - Galle

Transformer Protection

Electrical

Differential Protection

Restricted Earth Fault Protection

Over Voltage/ Under Voltage protection

Over Fluxing Protection

Mechanical

Buchhoz Relay

Winding and Oil Temperature

Oil level

Tank Pressure

High voltage transformers Current transformers voltage transformers Circuit breakers Surge arresters Isolators Wave traps Earth Switch Control panels Protection panels

Frequency controlling (1% tolerance from 50Hz) Voltage controlling Release lines and machines for maintenance Economic Dispatch of Thermal power plants

System Control Center

System operation priority Water usage priority Spinning Reserve Maximum generation unit System voltages

Major functions

System operation policy

Pond Balancing

Release lines and plants for maintenance

Transmission and Generation Planning Branch

Main objectives are find out the transmission developments and future Tx network.

To ensure reliable and stable power system and determine the investment requirement for the

transmission development within the planning horizon

PSS/E software is used to load flow analysis.

Generation Planning

Transmission Planning

The main function of the generation planning division is to prepare the Long Term Generation Expansion Plan (LTGEP). Demand forecasting is done for four sectors. They are ,

1.Domestic 2.Industrial 3. Commercial 4. Other

Transmission and Generation Planning Branch

Domestic 37%

Religious 1%Industrial 34%

General 27%Street Lighting 1%

Domestic | Industrial | Commercial | Other

Project and Heavy Maintenance – DD4

Major Functions Substation Maintenance Tower Line Construction and Maintenance

1. Hot line inspection 2. Preparing estimates 3. Hot line maintenance 4. Cold line maintenance

Replacing of flashover insulators & hardware. Replacing of corroded steel parts Re-tensioning of conductors. Re-conducting of conductors.

Repairing of stubs. Re-concreting of tower foundation Crimping midspan joints,T- off joints & repair sleeves. Applying of anticorrosive paint on towers. Re-fixing of number plate, phase plates etc.

SINGLE CIRCUIT

LOW

MEDIUM

HIGH

TERMINAL

DOUBLE CIRCUIT

HIGH

MEDIUM

HIGH

TERMINAL

SINGLE CIRCUIT

LOW

MEDIUM

HIGH

TERMINAL

DOUBLE CIRCUIT

HIGH

MEDIUM

HIGH

TERMINAL

Tower Type

MAST TYPE TOWER TYPE

Project and Heavy Maintenance – DD4

C.E.B. Southern province – DD4 Distribution Constructions Distribution maintenance Call centre Area office

Types of Poles

1. Reinforced Concrete Poles (RC poles) 2. Pre-Stressed Concrete Poles (PS poles) 3. Wooden Pole

Conductors Poles Conductor accessories Protection devices

DDLOLBS (load break switch)ABS(air break switch)

C.E.B. Southern province – DD4

Laxapana Power Station

Pond Balancing Single Phase transformers in both O/L and N/L O/L- 9.5 MW *3 + 12.5 MW*2 ( Horizontal axis Pelton Turbine) N/L - 57.5MW *2 (Vertical axis Pelton ) O/L - N/L - Excitation Systems

1. O/L (Stage1) and N/L – Brushless 2. O/L (Stage2) – Brush system

Pelton – High heads Francis – Medium heads Kaplan –Low heads

Lakvijaya Power Station

Coal-Thermal power plant900 MW – 3 * 300MW220kV transmission linesDistributed Control System (DCS)Gas Insulated Switching Yard (GIS)

Conclusion

Thank You