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Air-Insulated Substation
Suite of 6 modules (ELHVSAIS)
What will I learn from this course?

Understand the role of HV Air-Insulated Substation, and gain insight on transformers, circuit breakers, disconnectors, surge arresters and instrument transformers.

Topics
High Voltage Substation Module
  • Role and function of a HV Substation
  • Voltage levels associated with each network (LV, MV, HV, EHV, UHV)
  • Network disturbances/distinguishing Internal & external insulation failures
  • What factors determine the cost and architectural layout
  • AIS vs. GIS
  • Components found within an HV Substation
  • SF6 Gas (general overview)
  • Innovative solutions for both AIS and GIS
Power Transformer Module
  • Definition and operating principle: transformation ratio
  • Components (active part, winding layouts, insulation, bushings, conservator, cooling System, broad overview load vs. no load losses)
  • Why and which tap changer is needed?
  • Protection devices (lightning arrester, Buchholz relay, pressure relief device)
  • History of power transformers
  • Power transformer applications: generator transformer, auto-transformers, shunt reactor, HVDC converter transformer, smoothing reactor, furnace transformer, interconnection transformer, step-down transformer, rectifier transformer, trackside transformer
  • Transformer definition and specification: insulation levels, impedance, temperature rise, loss capitalization, transportation
  • Maintenance fundamentals
Circuit Breaker Module
  • Definition
  • Components: interrupting chamber, support column, operating mechanism
  • Circuit breaker types: Live Tank, Dead Tank, Hybrid Switchgear, Generator Circuit Breaker)
  • Rated characteristics
  • Design
  • Interrupting chamber technology: quenching agents, open-close-open cycle
  • Control & monitoring: closing resistors, grading capacitors, monitoring systems, RPH3)
  • Circuit breaker in action during single phase or 3 phase fault
  • Single-phase autoreclosure vs. 3-phase autoreclosure
Instrument Transformer Module
  • Definition
  • Why do we need Instrument Transformers
  • Roles: sensing, insulation, output
  • Current Transformer (CT), Voltage Transformer (VT), Combined Metering Unit (CMU)
  • Installation within the network
  • Shunt and series connection
  • Multiple secondaries, 1 common primary
  • Single line diagram representations
  • Current transformer designs: top core, hair-pin type, manufacturing, multiple ratios, reinforced security
  • Voltage transformer designs: magnetic, single core or cascade construction, capacitor/coupling capacitor, metering, protection, multiple ratios
  • Combined metering units advantages & limitations
Disconnector Module
  • Definition and functions
  • Open vs. closed position
  • Installation within the network
  • Selector switch disconnector vs. feeder disconnector
  • Maintenance & safety
  • Components: materials used, contacts, contact pressure, insulator, transmission, operating mechanism/drive, interlocks & arcing contacts
  • Types: horizontal, vertical, including, center break, double side break, knee type, semi-pantograph, pantograph, vertical break
Surge Arrester Module
  • Definition
  • Why do we need surge arresters?
  • Stacked disks/varistors
  • How surge arresters work
Languages

This suite of online courses is available in English.

Duration Who should attend?
4H30 Personnel working in an electrical environment