Electrical Maintenance Low and Medium Voltage

Dilihat 281

INTRODUCTION The backbone of many electric power systems is the medium voltage distribution system. Typically operating at voltages ranging from 2,400 to 34,500 Volts, voltage stress, corona, surges and protection of equipment all create unique challenges in design, equipment selection, operation and engineering. This 2 day class takes you through the basics of medium voltage power systems including components,equipment, design and operation problems as well as protection of medium voltage systems. OUTLINE MATERI 1. Introduction 2. Medium Voltage Safety

Electrocution at Low vs Medium Voltage
Arc Flash
Qualified Person
Approach Boundaries

3. Types Of Medium Voltage Systems

Utility and Industrial One lines
Reliability Requirements
Overhead and Underground Systems
Regulated Systems

4. Medium Voltage Cable

Copper vs Aluminum Design
Voltage Ratings
Insulation Ratings
100%, 133%, 173% Insulation Levels
Shielding Requirements
Electric Fields
Terminating MV
Conductors
Orientation of Overhead Lines

5. Medium Voltage Substation Transformers

Core and Coil Design
Aluminum and Copper Windings
Tank Constructio
Loss Evaluation
Efficiency
Regulation

6. Spot Networks

Spot Network Design
Network Protectors
Network Protector
Relay Operation
Directional Protection Requirements

7. Partial Discharge

Corona
Surface Tracking
Voltage Stress
Sensing Partial
Discharge
Component Failure

8. Grounding Medium Voltage Systems

Resistance Grounding
Solid Grounding
Ungrounded Delta
Charging Current
Effect of Ground Faults on Delta Voltage

9. Surge Protection

Lightning and Switching Surges
Classes of Surge Arresters
MCOV Ratings – (Maximum Continuous Operating Voltage)
TOV – (Maximum Temporary Over Voltage Capability)
Protective Characteristics
Surge Arrester Selection
Energy Capability
Effect of Grounding on Arrestor Selection
Insulation Coordination

10. Current Transformer Applications

Ratings
Selection Process
Accuracy
Saturation
Excitation
Curves
Burden Calculation
Momentary Ratings

11. Medium Voltage Circuit Breakers

Vacuum, Air, Oil, SF6 Designs,
Symmetrical Interrupting Rating
K-Rated Voltage Factor, Close and Latch Capability

12. Reclosers

Application on Feeder Circuits
Recloser Setting
Continuous Current and Interrupting Ratings

13. Medium Voltage Fuses

Medium Voltage Switches
Load Rating
Close and Latch
Rating
Short Time Rating
Expulsion vs Current Limiting
Fuse Characteristics
E and R Rated Fuses
Fuse Cutouts

14. Medium Voltage Protection Concepts

Medium Voltage Protection
Relays
Circuit Breakers
R and E Rated Fuses
Short Circuit vs Overcurrent Protection

15. Distribution Feeder Protection

Protection with Fuses – 300%
Overcurrent Protection with Relays – 600%
Short Circuit Damage Characteristics
Relay “Reach” for End of Line Faults

16. Rotating Machinery Protection

Requirements
Decrement Curves
Thermal Damage Curves
Reactive
Capability Curves
Differential Protection

17. Medium Voltage Motor Controllers

Protection Requirements
Motor Management Relays
Circuit
Breaker Protection
Relaying
Class R Rated Fuses

18. Transformer Protection

ANSI C57 Thru Fault Curves
Impact of Transformer Winding
Configuration
Overview of Differential Protection
Inrush and Harmonic Restraint

TRAINING METHOD Presentation Discussion Case Study Evaluation FACILITIES Training Kit Handout Certificate Lunch + 2x Coffee Break Souvenir

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HUBUNGI KAMI

Komplek Pertokoan Ruko Tritunggal No. T7, Jotawang, Bantul, Yogyakarta 55188

Phone : 0811 2949 265

Email : marketing1@cakrabiwa.co.id

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