Close

Dielectric Fluids Channel

Transformer Oil Testing

New Methodology for Dissolved Gas Analysis

A liquid dielectric is a dielectric material in liquid state. Its main purpose is to prevent or rapidly quench electric discharges. Dielectric liquids are used as electrical insulators in high voltage applications, e.g. transformers, capacitors, high voltage cables, and switchgear (namely high voltage switchgear). Its function is to provide electrical insulation, suppress corona and arcing, and to serve as a coolant. The principal functions of dielectric insulating fluids are to serve as a dielectric material and an effective coolant. To perform these functions, the insulating fluid must have specific necessary qualities at the time of initial impregnation and filling at the factory, which must be maintained at the same quality level in field operation if optimum performance is to be assured. A good liquid dielectric should have high dielectric strength, high thermal stability and inertness against the construction materials used, non-flammability and low toxicity, good heat transfer properties, and low cost. Liquid dielectrics are self-healing; when an electric breakdown occurs, the discharge channel does not leave a permanent conductive trace in the fluid. The electrical properties tend to be strongly influenced by dissolved gases (e.g. oxygen or carbon dioxide, dust, fibers, and especially ionic impurities and moisture. Electrical discharge may cause production of impurities degrading the dielectric's performance. Some examples of dielectric liquids are transformer oil, perfluoroalkanes, and purified water. Common liquid dielectrics: Mineral oil, n-Hexane, n-Heptane, Castor oil Natural Estervoltage capacitors, Hatcol 5005 Synthetic Ester, Silicone oil, Fluorinert.

special offer | Free Digital Handbook

Electrical Transformer Testing Handbook Volume 7
Electrical Transformer Testing Handbook Volume 7
  • Transformer/Line Loss Calculations
  • Guide For Testing Power Transformers
  • Overheated Transformer
  • A Guide to Transformer DC Resistance Measurements
  • Pressure Relief Valve Efficiency Cal...
FREE DOWNLOAD

dielectric fluids articles | From Electricity Today Magazine

On-Line Buyer's Guide
T&D On-Line Buyer's Guide

The Electricity Forum On-Line Transmission & Distribution Buyer's Guide is an interactive reference tool for buyers and specifiers, providing information on equipment, companies, products and services for North America's electrical industry. Search through hundreds of leading Suppliers and thousands of product categories. Add Your Company Today!

Magazine Subscription
Free T&D Magazine Subscription

The Electricity Forum is a North American "value added" publisher of Transmission & Distribution print/digital magazine: Electricity Today - a leading electrical transmission and distribution magazine. Magazine is distributed FREE of charge to North American electrical industry professionals.

Contribute To The Electricity Forum
Contribute To The Electricity Forum

The Electricity Forum is interested in publishing your technical, non-commercial articles, on a wide variety of subjects. We are seeking original content for our Transmission and Distribution Channels. Click here to view our author guidelines and submit your article today!

DIGITAL Media Kit
Content Community Connection
Top