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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 |
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