Design of Modern Electrical Distribution Systems Course

Course Overview:

The course covers all aspects related to the automation of the management level: LV and HV switchgear and circuit breakers selection, their operation and maintenance.

The participants will be introduced to the operation of CTs, VTs, and relays, and the connection of cables, the basics of working with the switchgears as well as safety measures. 

The course includes basic topics such as load flow studies, fault current analysis, motor starter calculations, and breaker calculations. It also includes more advanced topics such as derating factors, busbar size calculations, protection unit calculations, and regular switchgear testing.

The course is aimed at engineers and supervisors of projects design and their commissioning, and it helps them acquire necessary technical skills for the management of Switchgear in an adequate and safe manner.

Course Objectives:

Delegates will learn about the following:

• Selection of appropriate type and rating of circuit breakers and switchgear.
• Fundamentals of operation of switchgear.
• Switchgear components (CTs, VTs, relays, cable terminations)
• Safe operational policies including safety rules and safety documents.
• Able to discuss different LV for of separations.
• Fully understand how to size and select different type of motor starters.
• Diagnostic tools and test equipment for switchgears.
• Safe maintenance policies including safe working in switch rooms, indoor and outdoor substation

Who Should Attend?

This course is intended for engineers (Projects, Testing & commissioning, Design) and supervisors who have experience in this field.‏

Course Outlines:

• Introduction to LV & HV Switchgear.
•  Breaking of AC currents
•  Transient restrike recovery voltage (TRRV).
•  Surge arresters.
•  Metal clad & metal enclosed switchboards.
•  LV forms of separation.
•  Load flow studies (rated current).
•  Calculation of fault currents (simplified methods, PU, MVA & Symmetrical components).
•  Breaking & Making Capacities.
•  Different types of LV Circuit breakers/contactors (ratings &tripping units/curves).
• Sizing of motor starters (DOL, Star/Delta, Auto transformer & soft starters).
•  Fuse sizing for distribution transformers & motors.
•  Type 1 & type 2 co-ordination for motor starters.
•  Dimensioning of LV switchboards (MCC & power centers).
•  Different types of HV Circuit breakers (Oil, Vacuum, Gas & Air type)
•  Merits & demerits of each type of HV breakers.
•  Different de-rating factors (temperature, altitude, etc …).
•  Breaking capacity de-ratings according to IEC/ANSI C37.010.
•  Bus bar sizing/cross sectional area/current density & skin effect.
•  Specifications for switchboards.
•  Overview of protection & measuring units.
•  Different types electrical diagrams.
•  Panel scheduling.
• Type & routine tests on switchgear.
• Course Evaluation & Summary