Lecture 1 - Introduction to Electrical Switchgear.pdf
- 1. Dr. Ahmad Al-Subhi SWITCHGEAR AND PROTECTION Lecture 1 INTRODUCTION TO ELECTRICAL SWITCHGEAR Prepared by: Dr. Ahmad Al-Subhi
- 2. Outline: • What is switchgear? • Switchgear types. • Major switchgear equipment. Prepared by: Dr. Ahmad Al-Subhi
- 3. What is Switchgear? - Switchgear involves the apparatus used for switching, controlling and protecting the electrical circuits and equipment in the power system. - The term “switchgear” is a generic term encompassing a wide range of products like circuit breakers, switches, off- load isolators, fuses, contactors, etc… Prepared by: Dr. Ahmad Al-Subhi
- 4. - A general term covering switching and interrupting devices and their combination with associated control, metering, protective, and regulating devices; also assemblies of these devices with associated interconnections, accessories, enclosures, and supporting structures, used primarily in connection with the generation, transmission, distribution and conversion of electric power. C37.100-1992 - IEEE Standard Definitions for Power Switchgear: What is Switchgear? Prepared by: Dr. Ahmad Al-Subhi
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- 6. - In its initial design, it was a mechanical switch that physically separated or joined two or more conductors. - Development over time has made switchgears offer control, protection and isolation including various electrical equipment and circuits. - Switchgears comprise more than one device to form a system that collectively work together. - Power switchgear is used throughout the entire power system, from generation to industrial plants to connect incoming power supply and distribute power to consumers. Prepared by: Dr. Ahmad Al-Subhi
- 7. Switchgear Types: - Indoor: for voltages below 26 kV - Outdoor: for voltages beyond 26 kV (large area is needed) Prepared by: Dr. Ahmad Al-Subhi
- 8. Major Switchgear equipment: • Fuses. • Circuit breaker. • Recloser. • Sectionalizer. • Isolator. • Surge arresters. • Wave trap. • Current transformer. • Voltage transformer. • Relays. • ATS and UPS. Overcurrent protective devices Integrated with recloser to improve its functionaility Off load switch Provides protection from lightning Initiate the relay working The brain of power system protection Prepared by: Dr. Ahmad Al-Subhi Low pass filter to block high frequency signals Used for emergency conditions
- 9. Prepared by: Dr. Ahmad Al-Subhi