Course Details

Objective

By the end of the course, participants will be able to understand

• Understand the operating principles of Current Transformers (CTs) and Voltage Transformers (VTs).
• Perform routine maintenance tasks on CTs and VTs.
• Conduct testing and diagnostics to identify faults in CTs and VTs.
• Implement proper safety protocols when handling high-voltage electrical equipment.
• Interpret test results and take corrective actions to ensure reliable operation.
• Troubleshoot common issues with CTs and VTs in electrical systems.

Content

Day 1: Introduction to CTs and VTs

• Overview of electrical transformers: CTs and VTs
• Importance of CTs and VTs in metering, protection, and control systems
• Operating principles of Current Transformers (CTs)
  • Role in current measurement and protection systems
  • Construction and design features
• Operating principles of Voltage Transformers (VTs)
  • Role in voltage measurement and protection systems
  • Construction and design features
• Types of CTs and VTs: classification based on ratings, applications, and configurations

Day 2: Installation and Commissioning of CTs and VTs

• Requirements for installing CTs and VTs in electrical systems
• Correct placement and positioning in substations and power plants
• Wiring and connection methods
• Commissioning procedures for CTs and VTs
• Checking for correct operation after installation
• Common installation mistakes and how to avoid them

Day 3: Maintenance Practices for CTs and VTs

• Routine inspection procedures for CTs and VTs
• Identifying common issues: loose connections, physical damage, oil leakage (for oil-filled VTs), etc.
• Cleaning, lubricating, and tightening procedures
• Insulation resistance testing and interpretation of results
• Checking for primary and secondary winding faults
• Testing accuracy and calibration of CTs and VTs

Day 4: Testing and Troubleshooting CTs and VTs

• Testing methods for CTs:
  • Excitation test and burden measurement
  • Ratio and polarity tests
  • Insulation resistance test
• Testing methods for VTs:
  • Voltage ratio and insulation resistance tests
  • Burden testing and secondary voltage checks
• Troubleshooting CT and VT failures:
  • Identifying and fixing primary and secondary faults
  • Dealing with short circuits, open circuits, and wrong wiring
• Understanding test equipment and tools for accurate diagnostics

Day 5: Safety, Standards, and Reporting

• Safety precautions when handling high-voltage equipment
• Personal Protective Equipment (PPE) and safety protocols for CT and VT maintenance
• International standards for CT and VT testing and maintenance (IEC, ANSI, etc.)
• Reporting requirements and documentation for maintenance and testing
• Recap, final assessment, and Q&A session

NOTE:

Pre-& Post Tests will be conducted.

Case Studies, Group Exercises, Group Discussions, Last Day reviews, and assessments will be carried out.

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Methodology

A highly interactive combination of lectures and discussion sessions will be managed to maximize the amount and quality of information and knowledge transfer. The sessions will start by raising the most relevant questions and motivating everybody to find the right answers. You will also be encouraged to raise your questions and to share in the development of the right answers using your analysis and experiences.  Tests of the multiple-choice type will be made available daily to examine the effectiveness of delivering the course.

Very useful Course Materials will be given.

• 30% Lectures
• 30% Workshops and work presentation
• 20% Group Work& Practical Exercises
• 20% Videos& General Discussions