Aims: To provide students with an insight and an understanding of power system protection applications.
Learning Outcomes:
After completing this module, students should be able to: divide a power system network into manageable units suitable for protection. Design a non-unit protection scheme for distribution feeders and determine appropriate relay settings. Design unit protection schemes. Explain the characteristics and limitations of protection primary transducers. Design a distance protection scheme for transmission line circuits. Explain the design and operation of digital transmission line protection.
Skills:
Application of the information, techniques and methods discussed in the lectures to protect electrical power supply systems.
Content:
The protection overlay: Protection and metering transducers. Fuses. Overcurrent protection: relay types, operating characteristics and equations, grading, applications. Differential protection: voltage balance and circulating current schemes, biased characteristics and high impedance schemes. Applications to the protection of transformers, feeders and busbars. Distance protection: basic principle, block average comparator, zones of protection, residual compensation, power swing blocking. Digital protection: relay hardware. Digital signal processing in protection relays. Digital distance protection. Digital differential protection.
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