Transformer Signature Testing, Routine Testing & Commissiing Testing of Transformer Oil
Transformer Testing Services by Morgan Schaffer - Dissolved Gas analysis, ASTM Package, Oxidation inhibitor, Water Content, Power Factor (25oC to 100oC), Furan Content, Metals in Oil
When a new transformer is commissioned, establishing the Time Zero conditions is essential to start building the transformer’s analysis history. This package includes the key tests to run every time a new unit is put in place.
The recommended tests in this package include: Dissolved Gas analysis, ASTM Package, Oxidation inhibitor, Water Content, Power Factor (25oC to 100oC), Furan Content.
Also, It is recommended to perform routine tests at least once a year in order to monitor the health of your transformers. Faults can occur at any stage of your transformer's life and evolve rapidly. Testing your transformers on a regular basis will allow you to detect any unforeseen change in the condition of your transformers.
Dissolved Gas Analysis
Key gases detected: H2 (Hydrogen), O2 (Oxygen), N2 (Nitrogen), CH4 (Methane), CO (Carbon Monoxide), CO2 (Carbon Dioxide), C2H4 (Ethylene), C2H6 (Ethane), C2H2(Acetylene). DGA as per ASTM D3612.
Water reduces the insulation capacity of the oil, excessive moisture accelerates the decomposition of the paper insulation. Moisture in Oil content test as per ASTM D1533.
Furanic compounds are produced as the paper insulation deteriorates; measuring the concentration of those compounds gives an indication on the condition of the paper insulation. Furan content as per ASTM D5837.
Physical, Electrical and Chemical tests including: visual examination, dielectric breakdown, acidity, interfacial tension, density and color. All as per their specific ASTM test methods.
Oxidation occurs and inhibitor is consumed, controlling the inhibitor content extends the life of the oil by preventing sludge formation. Oxidation Inhibitor test as per ASTM D4768.
Power Factor 25°C and 100°C
Dissipation Factor is key for determining the presence of contaminants that cause power losses in the oil. Power Factor at 25°C and 100°C as per ASTM D924.
Polychlorinated Biphenyl content. PCB analysis as per ASTM D4059.
Metals in Oil
- In addition to the above tests, this test is carried out when trying to locate and identify a specific transformer problem. The results from these tests will allow you to determine what other tests are required to be performed in order to have a clear understanding of your transformer's actual condition.
High energy faults can generate metal particles of various kinds and establishing the concentration of these metal particles will help to narrow down the list of components involved in the fault.
Morgan Schaffer offers special transformer oil tests that allow you to have a more comprehensive view of your transformer oil condition. These tests can be run annually, bi-annually, or depending on the parameters evolution, a shorter sampling frequency may be required.
Corrosive Sulfur can lead to catastrophic failure of transformers by corroding copper on other metals; this test shows if the oil is corrosive or non-corrosive. Corrosive Sulfur Test as per ASTM D1275-B.
Recent studies have identified dibenzyl disulfide (DBDS) as a corrosive sulfur compound. Presence of DBDS is a complementary key analysis to ASTM D-1275-B.