Date of Award
Masters of Science
William B. Martin, Jr.
Dielectric liquids play an important role in the transmission, distribution, and use of electrical energy. A liquid is arbitrarily classed as a dielectric if its volume resistivity is 10(10) ohm-centimeters or greater. (An ohm-centimeter is the resistance between opposite faces of one cubic centimeter of the liquid.) Transformers, circuit breakers, cables, and capacitors are among the more common devices using liquid dielectrics. The chief electrical properties which determine the performance of a dielectric liquid are its ability to resist breakdown under electrical stress, its dielectric constant (or specific inductive capacity), and its loss factor - the energy loss per unit volume per cycle. These properties depend on the temperature of the liquid and the frequency of the applied voltage stress as well as on the structure of the constituent molecules.
With a view towards preparing an improved low temperature dielectric liquid, it was thought desirable to prepare some pure chlorinated phenyl ethers and measure their dielectric constants as a function of temperature while holding the applied voltage and frequency constant. A further object of the work was to discover if any correlation of points on the dielectric constant versus temperature curves of binary mixtures of the ethers could be used to determine the eutectic point of the system.
Martin, Raymond Stuart, "Dielectric constant-temperature relationship in some chlorinated phenyl ethers" (1958). Honors Theses. 2233.