Schedule Overview

Sessions

Power Transformers

Participants will be introduced to the most modern and effective test techniques and practices that can be applied to power transformers today. Participants will have an overview of transformer theory, diagnostic test methods, and data analysis strategies. All subjects presented are adequate for all levels of expertise, and all examples are derived directly from field experiences.

Introduction to Power Transformers

•  Transformer Types
•  Winding Configurations
•  Vector Groups
•  Conservator Types
•  Fluid Types
•  Construction Forms (Core, Shell)
•  Nameplates 
•  Cooling Modes
•  Life Expectancy 
•  Tap Changers (OLTC, DETC)
•  Bushings, Surge Arresters

Application, Analysis, and Interpretation of Electrical Measurements

•  Power Factor and Capacitance
•  Exciting Current
•  Transformer Turns Ratio
•  Leakage Reactance
•  DC Winding Resistance

Advanced Diagnostic Testing Methods

•  Variable Frequency Power Factor (VFPF)
•  Dielectric Frequency Response (DFR) – Moisture Estimation
•  Sweep Frequency Response Analysis (SFRA) – Mechanical Integrity

Instrument Transformers

This session will provide an introduction to instrument transformers design and testing, including a comparison of conventional methods verses innovative test methods.   

•  Basics about current transformers
•  An overview of the IEEE C57.13 standard
•  Constructions and types of current transformer (CT)
•  Meter and Protection application
•  Comparison of measurement methods

Application examples will be provided, including a review of practical experiences of performing the following tests on transformer bushing CTs:

•  Winding Resistance test
•  Excitation Test
•  Ratio error and phase displacement measurement
•  Polarity test
•  Residual Magnetism (Remanence)

Circuit Breakers

This session will provide an overview of Circuit Breakers.  Understanding diagnostic testing of HV Circuit Breakers is essential. When diagnostic tests are performed on HV Circuit Breakers, valuable information can be extracted. From a technical maintenance perspective, these diagnostic tests provide critical information about the condition of HV Circuit Breakers.

Standard field tests widely applied today in HV Circuit Breaker diagnostics include:

•    Timing and Travel
•    Contact Resistance (Static and Dynamic)
•    Minimum Pick-Up

These specific diagnostic tests have been selected as the primary focus for this seminar session.

The discussion will focuses on how diagnostic techniques can be applied to HV circuit breakers as part of the standard condition assessment protocol. The audience will be provided with an understanding, application, and analysis of these tests, supported by case studies validating the value that these diagnostic tests bring to HV circuit breaker testing.