HIGH VOLTAGE DESIGN TRAINING

Topics to be discussed

Art of Conceiving SLD with preliminary data considering technical and commercial aspects

• Identifying the voltage levels for the plant
• Identifying the  substation /switchgears and locations
• Identifying transformer MVA , voltage ratio, %Z  ratings
• Detecting Earth fault in LV System
• Basic calculation for short circuit powers and voltage dip .

 

Selection of  Switchgears

Identifying the Type of Switchgear requirement

Ø  Motors

Ø  Transformers

Ø  Capacitors

Ø  Generator

Ø  Cables

 

Classification of Switchgear( As per IEC 62271-200)

Ø  Accessibility

Ø  Loss  of Service continuity

Ø  Type of Barriers

Ø  Internal Arc Classification

.

Operating Parameters of MV Switchgear

Ø  Rated Voltage

Ø  Impulse Voltage

Ø  Power Frequency Voltage

Ø  Short Time Withstand Current

Ø  Peak Withstand Current

Ø  Minimum Short Circuit Current

 

Selection of  Switchgear Components and its functions

Ø  Disconnector

Ø  Earthing Disconnector

Ø  Switch

Ø  Disconnector Switch

Ø  Circuit Breakers

Ø  Contactors

Ø  Fuse

 

Selection of Instrument Transformers for Protection and Metering

Ø  Current Transformers

Ø  Voltage Transformers

Ø  Low power Current Transformers

• Accessibility and Service Continuity of switchgears
• Identifying Dielectric Withstand and Protection
• Graphical Symbols of Switchgear Components

 

Substation Design

Basics of Substation Design

Ø  Substation Arrangement

Ø  Substation Type

Ø  Substation Equipment

Ø  Substation Layouts

 

Selection of Protection Philosophy           

Ø  LV Motor feeders

Ø  LV Outgoing feeders

Ø  LV Transformer feeder

Ø  LV Incomer feeder

Ø  LV Bus coupler feeder

Ø  MV Motor feeders

Ø  MV Tie feeders

Ø  MV Transformer feeder

Ø  MV Incomer feeder

Ø  MV Bus coupler feeder

Ø  Auto Changeover Philosophy

 

• Substation Communication Protocol
• Identifying the needs of Intelligent Relays
• ANSI Codes for Protection.
• Any other relevant topic

 

 SLD Review and Interlocks for Switchgear

• Review  of Single Line Diagram and Protection Metering Diagrams.
• Safety interlocks between switchgears.
• Safety and operation consideration for control voltage distribution.
• Safety and operation consideration in UPS and battery/battery charger system

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