Chapter 16. Transformer Testing

Chapter 16. Transformer Testing - 16 Transformer Testing...

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16 Transformer Testing Shiri sh P. Mehta Willia m R. Henni ng Waukesha Electric Systems 16.1 Introduction. .................................................................... 16 -1 Standards . Classification of Tests . Sequence of Tests . Scope of This Chapter 16.2 Voltage Ratio and Proper Connections. ........................ 16 -4 The Purpose of Ratio, Polarity, and Phase-Relation Tests . Ratio Test . Polarity Test . Phase Relationship Test 16.3 Insulation Condition. ...................................................... 16 -5 The Purpose of Insulation Condition Tests . Insulation Power Factor . Insulation Resistance 16.4 Control Devices and Control Wiring. ........................... 16 -7 16.5 Dielectric Withstand . ...................................................... 16 -7 Transient Dielectric Tests . Low-Frequency Dielectric Tests 16.6 Performance Characteristics. ........................................ 16 -17 No-Load Loss and Excitation-Current Measurements . Load Loss and Impedance Measurements . Winding Resistance Measurements . Heat Run Tests 16.7 Other Tests. .................................................................... 16 -26 Short-Circuit-Withstand Tests . Special Tests 16.1 Introduction Reliable delivery of electric power is, in great part, dependent on the reliable operation of power transformers in the electric power system. Power transformer reliability is enhanced considerably by a well-written test plan, which should include specifications for transformer tests. Developing a test plan with effective test specifications is a joint effort between manufacturers and users of power transformers. The written test plan and specifications should consider the anticipated operating environment of the transformer, including factors such as atmospheric conditions, types of grounding, and exposure to lightning and switching transients. In addition to nominal rating information, special ratings for impedance, sound level, or other requirements should be considered in the test plan and included in the specifications. Selection of appropriate tests and the specification of correct test levels, which ensure transformer reliability in service, are important parts of this joint effort. Transformers can be subjected to a wide variety of tests for a number of reasons, including: . Compliance with user specifications . Assessment of quality and reliability . Verification of design calculations . Compliance with applicable industry standards ß 2006 by Taylor & Francis Group, LLC.
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16.1.1 Standards ANSI standards for power transformers are given in the C57 series of standards. Requirements that apply generally to all power and distribution transformers are given in the follow ing two standards. These standards are par ticularly relevant and useful for those needing information on transformer testing. IEEE C57.12.00, IEEE Standard General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers [1]. IEEE C57.12.90, IEEE Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers; and Guide for Shor t-Circuit Testing of Distribution and Power Transformers (ANSI) [2].
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This note was uploaded on 10/19/2010 for the course ENGINEERIN ELEC121 taught by Professor Tang during the Spring '10 term at University of Liverpool.

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Chapter 16. Transformer Testing - 16 Transformer Testing...

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