Articles

Over the last couple of years, transformers in various locations worldwide have been failing due corrosive sulphur deposits on the copper winding insulation. Since the copper contains some impurities (no matter how small), the sulphur in the oil may react with these and this product (Copper Sulphide) will then float in the oil and attach itself to the paper insulation, reducing its insulation ability. Silvered contacts have also, been known to be effected by corrosive sulphur. Flaking on the silver can occur and [...]

DETAILED GAS ANALYSIS - Transformer Oil The collection of Transformer Oil samples according to the following procedure... For D.G.A. to be meanful samples should be collected according to EN60567 or IEC567, however, the following briefly details the procedure which should be adopted. ...The 3 way stop cock should be fitted to the syringe and a oil proof plastic or rubber tube is fitted to the inlet port of the stop cock through which the oil may be sucked into the syringe. ...With the [...]

The process of Reclaiming Transformer Oil involves the removal of Partials, Moisture, Gases, Acidity and other Oxidation Decay Products, polishing the oil and restores oil to like-new quality. This process of Regeneration is simply the passing of Badly Deteriorated Transformer Oil through an Absorbent Bed. Several types of absorbents are available but the most common are Fuller’s Earth, Activated Alumina, Trisodium Phosphate and Activated Carbon. The FILTERALL REGENERATION process utilises a blend of such Absorbents which is formulated and structured in order to [...]

This paper is intended to explain the Regeneration procedure recommended to be carried out prior to the addition of proposed Passivator agent. The process of Reclaiming Transformer Oil involves the removal of Partials, Moisture, Gases, Acidity and other Oxidation Decay Products, polishing the oil and restores oil to like-new quality. This process of Regeneration is simply the passing of Badly Deteriorated Transformer Oil through an Absorbent Bed. Several types of absorbents are available but the most common are Fuller’s Earth, Activated Alumina, Trisodium [...]

Oil Regeneration is an important part of regular transformer preventative maintenance.  Oil regeneration is better than oil purification, filter processing or retrofilling because it removes dissolved gases and oxidation by-products from both the oil and the cellulose insulation systems. As oil ages in a transformer, it oxidises and begins to break down.  Some of the by-products of this degradation are acids, aldehydes and peroxides.  These bind together and form sludge. Sludge attacks the chemical bonds, which hold the cellulose insulation together. When the [...]

PAPER! That’s right, paper provides the mechanical strength holding your transformer together, be it a small distribution transformer or a giant generator transformer! Paper provides Mechanical Strength, Dielectric Strength and Dielectric Spacing. So what if my transformer is held together by paper? It can’t be under any stress since it has no moving parts ? WRONG ! Other than load tap changes, a transformer has no mechanically moving parts, but it does move due to mechanical vibration, switching surges, line surges and limited [...]

Modern oil purification systems such as the FILTERALL Transformer Oil Purification Plant Type E, are most effective in removing moisture from transformer oil. However, regardless of such high efficiency of dehydration of the oil, the reality of the integrity of the insulation system is not totally confirmed after such oil processing. In a transformer dry out situation, the eventual rate of water removal is very small;; and continued oil processing becomes economically prohibitive. Whilst the oil inside the transformer may be dry after [...]

It is suggested the transformer be de-energized for a short period while you make your connections and establish good oil flow between the Purifier and the Transformer. It is also recommended that the oil within the Conservator be processed first so to ensure any water or contaminants which may be sitting in the bottom of the conservator are removed rather than “flushed” into the transformer tank. (*This can only be done if 2 connections exist on the conservator). Ensure that the Purifier is [...]