COURSE OVERVIEW:

Medium Voltage (MV) circuit breakers are the backbone of primary distribution, tasked with the reliable interruption of faults and the safe switching of critical grid assets. This course provides an exhaustive technical analysis of MV breaker technology, focusing on the mechanics of arc quenching in vacuum and SF6 media. Participants will explore the engineering principles that allow these devices to manage high-energy transients while maintaining structural and dielectric integrity.

The scope of this training addresses the full lifecycle of MV breakers, from initial design and application sizing to long-term condition monitoring. It covers the technical nuances of "Operating Mechanisms," focusing on the stored energy systems (Spring, Magnetic, or Pneumatic) that ensure high-speed operation. The curriculum provides a detailed focus on the integration of breakers within "Metal-Clad" and "Metal-Enclosed" switchgear, including the rigorous requirements for safety interlocking and racking.

Coverage includes the implementation of advanced diagnostic testing according to IEC and ANSI standards, such as "Vacuum Integrity" testing and "SF6 Gas Analysis." Attendees will learn to interpret "Timing Graphs" and "Travel Curves" to identify mechanical wear and to troubleshoot "Fail-to-Trip" or "Fail-to-Close" control failures. By combining theoretical arc physics with practical maintenance workflows, the course equips professionals with the expertise required to maximize the reliability and performance of their medium voltage assets.

COURSE OBJECTIVES:

After completion of this course, the participants will be able to:

• Define the operational ratings of MV breakers: kV, I_sc, BIL.
• Differentiate between "Vacuum" and "SF6" quenching technologies.
• Identify the mechanical components of the "Stored Energy" mechanism.
• Select and size MV breakers for specific cable and transformer loads.
• Execute "Vacuum Integrity" (Bottle) testing with technical precision.
• Perform "SF6 Gas Quality" and "Leak Detection" procedures.
• Execute "Breaker Timing" and "Travel" analysis using digital testers.
• Maintain and lubricate mechanical linkages and "Latch" systems.
• Troubleshoot electrical control circuits, including "Anti-Pumping" logic.
• Execute "Contact Resistance" (Ductor) and "Insulation" (Megger) tests.
• Implement "Interlocking" protocols for safe racking and maintenance.
• Develop a "Condition-Based" maintenance plan for MV switchgear.

TARGET AUDIENCE:

This course is intended for Substation Engineers, Maintenance Technicians, Asset Managers, and Distribution Operations Personnel.

TRAINING COURSE METHODOLOGY:

A highly interactive combination of lectures, discussion sessions, and case studies will be employed to maximize the transfer of information, knowledge, and experience. The course will be intensive, practical, and highly interactive. The sessions will start by raising the most relevant questions and motivating everybody to find the right answers. The attendants will also be encouraged to raise more of their questions and to share in developing the right answers using their analysis and experience. There will also be some indoor experiential activities to enhance the learning experience. Course material will be provided in PowerPoint, with necessary animations, learning videos, and general discussions.

The course participants shall be evaluated before, during, and at the end of the course.

COURSE CERTIFICATE:

National Consultant Centre for Training LLC (NCC) will issue an Attendance Certificate to all participants completing a minimum of 80% of the total attendance time requirement.