# Electrical 3 Phase Power Transformers Fundamentals

The basic principles of high voltage transformers, from a protection & control perspective.

Electromagnetic forces interact with electrically charged particles and electromagnetic fields; this course will study how these forces lead to voltage & current transformation. Ratios and polarity is also studied leading to the introduction of potential transformers & current transformers, and their use in conjunction with the relevant instruments such as ammeters, voltmeters, watt meters and energy meters.

What you’ll learn

• Electromagnetism, Voltage & Current Transformation, Ratios and Polarity, Potential & Current Transformers, 3 Phase Transformers Construction, Transformer Classifications, Losses & Cooling, Per Unit Equivalent Circuits, 3rd Harmonic Currents problems, Tertiary Windings, The Buchholz Relay, Oil Analysis, Transformer Connections: Y – Y, Delta – Delta, Y – Delta, Y – Zig-Zag, Transformer Over-Current Protection, Transformer Differential Protection, Relays old and new.

Course Content

• This section contains 9 lectures including the introduction. –> 9 lectures • 5hr 37min.

Requirements

• Basic Electrical; Mathematics; Trigonometry.

Electromagnetic forces interact with electrically charged particles and electromagnetic fields; this course will study how these forces lead to voltage & current transformation. Ratios and polarity is also studied leading to the introduction of potential transformers & current transformers, and their use in conjunction with the relevant instruments such as ammeters, voltmeters, watt meters and energy meters.

Transformer core construction along with losses & cooling mitigation techniques. 3 phase transformer configurations are studied along with harmonic distortion, CT saturation and on-load tap-changer problems and how these problems are dealt with. Over-current and restraint differential transformer protection is developed along with a look at some examples of ” Old School relays” as well as modern IDE (intelligent Electrical Devices) relays.

Transformer Connections: (Y – Y; Delta – Delta; Y – Delta; Delta – Y & Y – Zag Zig) are examined along with Transformer Clock System Vector Nomenclature.

Oil Analysis and the Buchholz Relay are also studied.

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