Design of Electric Switchboards (LV and MV) Only of Design and Engineering Engineers Course

Course Overview:

This course covers the principles and practices associated with the selection, operation, and maintenance of LV and HV switch gear and circuit breakers in specific detail.

Participants will acquire knowledge on a variety of switch gear components, such as CTs, VTs and relays, and be able to demonstrate safe operational and maintenance practices in substation and switch rooms. 

The subjects of the course practice load flow studies, fault current calculations, motor starter sizing and breaker ratings. The course delves into also de-rating, busbar, sizing, specification and testing of switchgear. 

This course is targeted at engineers and supervisors doing project, testing, commissioning, and design activities and provides delegates with practical knowledge and skills to optimize switch gear systems and ensure safe and efficient operations.

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