Power Transformer Protection

In Power Transformer Protection, you'll learn ...

• Types of transformer short circuits
• Factors that limit the magnitude of a transformer winding fault
• Causes of abnormal stresses in a transformer
• Methods of power transformer protection

Overview

Preview a portion of this course before purchasing it.

Credit: 4 CPD

Length: 60 pages

The advancement of electrical power systems has been reflected in the developments in power transformer manufacturing. This has led to a wide range of power transformers. Their ratings range from a few kVA to several hundred MVA and they are used for a wide variety of applications.

Power transformer protection varies with the application and transformer importance. In the case of a fault within the power transformer it is important to minimize tripping time in order to decrease the impact of thermal stress and electro-dynamic forces. Distribution power transformers can be protected by using fuses or overcurrent protection relays. This leads to time-delayed protection due to downstream co-ordination requirements. Nevertheless, time delayed short circuit clearance is unacceptable on larger power transformers due to system operation/stability and cost of repair.

This course is intended for electrical engineers with a desire to understand power transformers protection fundamentals. Presented information includes details related to interturn, tank and core faults. Information on over-voltages, magnetizing inrush, overheating is also included.

Learning Objectives

Upon completion of this course, participants will be able to:

• Summarize power transformer fault background.
• Identify power transformer differential protection.
• Describe power transformer restricted earth fault and overcurrent protection.
• Trace phase correction and filtering of zero sequence currents.
• Explain over fluxing and tank-earth protection.
• Compare buchholz protection.
• Differentiate earthing transformer protection.
• Analyze autotransformer protection.
• Calculate non unit and unit protection schemes.
• Apply power transformer condition monitoring.

Certificate of Completion

You will be able to immediately print a certificate of completion after passing a multiple-choice quiz consisting of 35 questions. CPD credits are not awarded until the course is completed and quiz is passed.