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Two-day Short Course on Planning and Operation of High Tension Distribution Network (8th Run) Conducted By Teo Cheng Yu B.Sc, M.Sc, DIC, P.Eng, C.Eng, FIES, FIEM, FIEE
Objective This course is intended to introduce participants to the high tension (HT) distribution system, planning criteria, scheme of connection, load flow, fault level analysis and the grading of protective relays. Through lecture, hands-on exercises and the support of several dedicated PC-based integrated packages, the participants will become familiar with the criteria and procedure for the planning of distribution system, fault level calculation, reduction of distribution loss, voltage drop calculation and means of voltage control, adjustment of power factor and the analysis and grading of overcurrent and earth fault relays. Participants will also be exposed to the new approaches in using artificial intelligences in the process of fault diagnosis and supply restoration. Course Outline1. Distribution Network Configuration and Assessment (3 hours). Introduction to distribution system and its components. Radial, ring, network and other scheme of connection. Typical Power Grid distribution system. Planning criteria for primary distribution network. Design of a new distribution system. Assessment of network proposal and recommendation for network reinforcement. Capital cost and tariff for distribution network investment.
2. Modeling and Analysis of HT network (3 hours). Utility source representation. Fault level and calculation of 3-phase fault and earth fault current. Modeling of distribution network operation by integrated load flow analysis. Motor starting, voltage and power factor compensation by capacitors and transformer tap changer. Example on voltage and circuit contingency analysis of a large 22 kV network fed by two 66/22 kV transformers. Examples of 22 kV network integrating local generator synchronized to Power Grid. Manual calculation of voltagedrop, distribution loss and fault level.
3. Protective Zone, Relay Type and Grading Margin (2 hours) Zones of protective, main and backup protection. Types of IDMT, DTL relays and direct-acting LV breaker. CT and relay errors and minimum grading interval. Formulae for different types of relays and graphical representation.
4. Overcurrent Settings and Grading Algorithm (2 hours) Determination of overcurrent current settings or plug settings. Conventional and digital types of relays. Transformer damage curve and cable withstand limit. Transformer inrush current and motor starting. Fuse characteristics. Determination of time multiplier TMS settings. Grading algorithm for top-down and bottom up grading.
5. System Earthing and Earth Fault Settings Grading Algorithm (2 hours) Transmission and distribution system earthing. Schemes of earth fault detection. Determination of earth fault current settings or plug settings. Determination of time multiplier TMS settings for earth fault. Bottom-up and top-down grading algorithm for earth fault. Relationship between earth fault settings and overcurrent settings for a delta-wye transformer.
6. Hands-on Exercise on Two Simple Networks (2 hours) In a sample 22 kV/LV network, investigate means to reduce distribution loss, improve power factor, appropriate control to make voltage above a given value, start a large motor and show fault level in each node. Calculate the fault level when the transformers are operated in parallel and verification of tripping discrimination. To meet a load of 2700 kVA over a distance of 300 m, determine the differences of a LV scheme and a 6.6 kV scheme.
7. Fault Diagnose and Supply Restoration (2 hours). Process of fault diagnosis. Generic core rules, relay setting inference and specific DKBS record matching. Direct and partial restoration algorithm. Branch and priority restoration algorithms. Examples to illustrate the process of diagnosis and restoration.
Who Should Attend All practising engineers and technicians engaged in the design and installation of electrical system in the power industries. These include designers of electrical installation, M & E engineers, consulting engineers, electrical contractors, facilities engineers and managers in charge of HT network and building services. PE Board Accreditation This short course is accredited by Singapore Professional Engineers Board and each participant on completion of the course should be given 16 PDU units. Course Lecturer
C Y Teo received the B.Sc. (Eng.) in Electrical Eng. from National Taiwan University in 1971 and the M.Sc. in electrical machines and power systems from the University of London in 1974. He has worked in many areas of computer applications in power systems since he joined the Imperial College, University of London as a research assistant in 1973. Subsequently he was appointed engineer, executive engineer, senior engineer and project manager in the Public Utilities Board, Singapore from 1974 to 1981. With the Nanyang Technological University for 24 years from Senior Lecturer to Assoc Professor, he was appointed Head of Division of Electrical Engineering for 6 years. He was elected as the Chairman of the IEE Singapore Centre from 1993 to 1995 and is Fellow of the IEE, UK(1991), Fellow of IES(1994), Fellow of IEM(1994) and PUB/EMA licensed engineer (HT) since 1981. He was appointed as Technical Working Group member of Energy Market Company, EMC from 2003 to 2006 and member of the PE Board Examination Committee from 2004 to 2010. He is the author of three books in Pascal programming and the popular book on Low Voltage Systems. He is also the developer of a number of PC-based integrated simulators for power system planning, operation and analysis, and for the design and assessment of electrical system in buildings. He is currently the Director of Byte Power handling operational planning and simulation of a number of large HT networks including embedded generators. Course Registration Registration fee includes lecture, computer demo, lunches, refreshment and all the relevant notes. Certificate will be issued to participants who have completed the whole course. Registration should be accompanied by payment in full and is on a first come, first served basic. Please make cheque payable to Byte Power Publications and send together the details of the name of participant, name of organization, contact number, course title and address to Byte Power Publications 10H Braddell View, #23-30, Singapore 579727 Tel 6256 0101 E-mail: cyteo@ntu.edu.sg
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