Power Transformer Maintenance and Acceptance Testing


Power Transformer Maintenance and Acceptance Testing



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File : 3.7 MB, 62 pages






TABLE OF CONTENTS

INTRODUCTION / SAFETY

Purpose

scope

References

Maintenance and testing

safety

Name plate data



CONSTRUCTION Theory

Transformer applications

Magnetic flux

Winding, current and voltage ratios

Core construction

Core form construction

Shell form construction

TRANSFORMER CONNECTIONS AND TAPS

Tapped Primaries and secondaries

Polarity

Autotransformers

Single and multi-phase relationships

Delta-wye and wye-delta displacements



COOLING CONSTRUCTION Classifications

Classifications

Dry-type transformers

Liquid-filled transformers

Tank construction

Free breathing tanks

Conservator tank

Gas-oil sealed tank

Automatic i-net gas sealed tanks

Sealed tank type



INSULATING FLUIDS

Oil

Oil testing

Dissolved gas in oil analysis

Transformer oil sampling

Synthetics and other insulating fluids



INITIAL ACCEPTANCE INSPECTION TESTING

Acceptance

Pre arrival preparations

Receiving and inspection

Moving and storage

Internal inspection

Testing for leaks

Vacuum filling



TRANSFORMER TESTING

Test data

Direct current testing

Alternating current testing



TRANSFORMER AUXILIARY EQUIPMENT

Auxiliaries

Bushings

Pressure relief devices

Pressure gauges

Temperature gauges

Tap changers

Lightning (surge) arresters



COMPREHENSIVE MAlNTENANCE / TESTING PROGRAM

Transformer maintenance

Maintenance and testing program

Documentation

Scheduling



STATUS OF TRANSFORMER MONITORING AND DIAGNOSTICS

Introduction

Transformer Monitoring

Transformer diagnostics

Conclusions

REFERENCES

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