MVLV ELECTRICAL RETICULATION: DESIGN, INSTALLATION, REFURBISHMENT AND COMMISSIONING – 2CPD

SYNOPSIS

Today, the demand for technical skills and expertise in Medium Voltage/Low Voltage (MV/LV) electrical reticulation is increasing. It is the responsibility of companies, industries and municipalities to improve and educate their workforce to flow with the technological trend in MV/LV reticulation.

Selections of appropriate MV/LV reticulation philosophy, equipment, cable sizing, fault level calculations, earthing design, protection schemes, etc. are crucial matters that determine any electrical reticulation’s life span. Nowadays, several methods of MV/LV reticulation have been developed, for instance, philosophies like SWER, phase-to-phase systems, single-phase and dual-phase systems have evolved as the most cost-effective systems. However, MV/LV electrical reticulation methods are not always the same in a different environment; therefore, in-depth knowledge of reticulation methods is required by a designer to design a system that will provide maximum return on investment considering capital cost as well as operations and maintenance costs.

This intensive two-day workshop based on appropriate SANS and IEEE standards aims to expound reticulation practices by thoroughly explaining with detailed discussion and real-life practical examples of design, installation, refurbishment, and commissioning of MV/LV electrical reticulation.

Key benefits of attending

• Delegates will be equipped with essential knowledge and state-of-the-art MV/LV reticulation planning, design and design tools, Installations and maintenance.
• Get acquainted with procedures of obtaining fault level calculations and sizing of switchgear
• Learn how to select cable size and types for MV/LV reticulation system
• Imbibe strategy of transformer sizing and selection
• Comprehend the design and application of protection schemes to any MV and LV Reticulation system components
• Understand effective and non-effective earthing to any medium voltage and Low Voltage Reticulation Networks, etc.
• Apprehend and apply appropriate techniques in design and installation of power reticulation within the building including sizing of standby generators
• Enhance your expertise and credibility

Workshop outline

Day 1 module 1

Introduction to MV/LV reticulation

• Life cycle of an electrical network
• Power supply characteristics of medium voltage network
  • MV radial network: Single-line service
  • MV loop: Ring-main service
  • Two parallel MV cables: Parallel feeders service
• Electrical reticulation networks
• Low-cost reticulation systems
  • Single-phase, 2-wire feeders with light (small) conductors
  • SWS –Shield Wire Systems
  • CCS –Capacitor Coupled Substation

Day 1 module 2

ELECTRICAL RETICULATION PLANNING, DESIGN & UPGRADE

• The planning procedure of electricity supply system
• Planning and designing of electricity supply system
• Design and Construction of network assets
• Stages of design
• Maximum demand estimation
• After Diversity Maximum Demand (ADMD) estimation and Load forecasting
• Design tools
• Upgrade of Existing system (MV & LV)

Day 1 module 3

 Fault, Fault Levels calculation and switchgear

• Faults in power system
• What causes short circuit
• What are physical damages from faults
• Why do we perform fault analysis and how?
• Per unit calculation
• Fault level calculation
• Selection of switchgear and cables based on fault levels

Day 2 module 4

MV/LV Reticulation Protection scheme philosophy and selection

• Introduction
• Short circuit performance of protection devices
• Feeders Protection Schemes;
• Transformers Protection Schemes;
• Course activities

Day 2 module 5

 MV/LV Reticulation Earthing

• Introduction to earthing;
•  Objectives of earthing;
• Functions of earthing systems
• Families of earthing arrangements: TN−S, TN-C, TN-C-S, TT and IT System Earthing
• Different Methods of Power System Earthing;
• Earthing of Equipment installations
• Transformer MV/LV earthing;
• Portable earthing equipment
• Substation earthing
•  Material for earthing application

Day 2 module 6

Design and Construction of Overhead reticulation system

• Introduction
• What are we designing for
• What physical loadings do we have to allow for our design?
• What physical conditions do we have to allow for in our design?

• How do we allow for all these variable factors in our design?
• Factors in line design
• General Specification for Overhead Electrical Reticulation
• Material selection
• Selection of Insulators; Conductors; Crossarms; Poles; Pole Foundations; Ground Stays
• LV ABC Overhead Lines
• Structure selection guide
• Clearance between MV and LV conductors
• Construction of overhead
• MV and LV Concrete pole orientation layout
• Pole mounted transformers
• Pole Top Boxes (PTB)
• Service Connections
• Metering

Day 2 Module 7

Design and Construction of underground reticulation system

• General Specification for Underground Electrical Reticulation;
• Cable types and cable selection;
  • Size and type of load to be supplied
  • Permissible voltage drop
  • Short circuit ratings of cables
  • Environmental Conditions of Installation
  • Worked examples of cables selection
• Cable installation methods

 

Day 2 Module 8

Power Reticulation within a building

• Introduction to power distribution in buildings
• Load assessment and maximum demand
• General power reticulation within building
• Distribution system configuration
• The vertical supply system (rising mains);
• The horizontal supply (distribution at each floor level).
• Incoming supply
• Main switchgear;
• Emergency Generator and UPS
• Final circuit switchgear
• Circuit protective devices
• Cable and distribution
• Final circuit
• Calculations
• Course activities

Day 2 Module 9

Installation commissioning, testing and handover

• Introduction
• Who must have a Certificate of Compliance for electrical installation?
• What is a Certificate of Compliance
• Who is this registered person?
• Inspection and tests
  • MV Inspection and test: Testing of the fixed electrical installation, transformers, switchgear, cables, batteries etc
• Documentation