The DLT Automatic Transformer Insulation Oil Tan Delta Tester is a high-precision testing instrument. It consists of an oil cup, temperature controller, a dielectric loss test bridge, AC trial electrical source, standard capacitor and DC high-voltage power etc. It can be performed on a live transformer with the oil inside or on an oil sample taken from the transformer for laboratory testing. It can be used to identify aging and moisture issues in the insulation.
Measurement Of Tan Delta
Tan delta testing is a sensitive way to determine the quality of transformer oil. It can help identify polarized contaminants like moisture, particles and fibres, which can cause insulation failure. The test can be performed in-situ or by taking an oil sample for laboratory analysis.
Ideally, the tan delta value should be close to zero. Higher values suggest that the insulating material is in poor condition and needs replacement or regeneration. This information can help you make decisions regarding the operation of your equipment and plan maintenance activities accordingly.
The tan delta testing process can be conducted in-situ on a live transformer with oil inside or by sampling the oil and conducting tests in the laboratory. In-situ tests are faster and cheaper, but they may not provide as accurate results as a laboratory test. Moreover, the tan delta readings are affected by the frequency of the imposed voltage. So, it is vital to test the insulating oil at the correct frequency for precise outcomes.
Measurement Of Resistivity
The insulating oil tan delta test is a reliable and precise means of assessing the quality of transformer oils. It detects contaminants such as moisture, which can reduce the oil’s insulating capability. It also identifies degradation byproducts that may affect the performance of the oil.
In addition to measuring the dielectric loss tangent, the tan delta tester measures resistance as well. Resistivity is an intrinsic property of a material that quantifies how strongly it opposes the flow of electric current. Typically, higher resistivity values indicate lower insulation quality.
The insulating Dielectric oil tan delta meter tester has high automation so that the heating of the oil cup, the measurement of dielectric loss, and the measurement of resistance can be completed in one test without any operator involvement. It uses medium frequency induction heating with a PID temperature control algorithm to ensure accurate and consistent results. The instrument is also capable of operating in conditions with a humidity level up to 75% RH.
Measurement Of Power Factor
The tan delta test measures the insulating strength of transformer oil and identifies oxidation by-products. It is a non-destructive, reliable method for assessing the aging of high voltage equipment. It can be used to assess power transformers, instrument transformers, bushings, motors, generators, cables, and other electrical apparatus.
The insulating capacity of the oil is determined by its loss factor, which reflects the amount of energy that is dissipated within it. A low tan delta value indicates excellent insulating properties. A high tan delta value indicates deteriorating insulating capabilities, and may indicate that the oil needs replacement.
A tan delta meter can also be used to assess the condition of MV cables, such as XLPE and EPR. It can detect leakage paths and identify potential damage caused by excessive heat. It can also identify impurities such as moisture and oxygen. The tan delta test provides both standard and customizable testing modes to meet specific requirements. It can also be used for quality control and acceptance of new equipment, ensuring compliance with technical specifications and performance standards.
Measurement Of Temperature
Using a tan delta tester to assess transformer oil quality is a reliable and precise method. It determines the tangent of the loss angle, which provides important information about the condition of the transformer’s insulation. This information is important for determining when the transformer needs to be replaced or repaired.
The GTD-61A Automatic Transformer Insulating Oil Tan Delta(OTD) & Oil Dielectric Dissipation Factor Tester is highly automated, enabling it to measure temperature rise, dielectric loss, and resistance in one go. It also has a real-time clock, which allows the test date and time to be saved, displayed, and printed along with the test results.
The instrument adopts intermediate frequency induction heating and PID temperature control algorithm, which can guarantee the accuracy of the measurement within the preset error range. The internal standard capacitor is an SF gas-filled three-electrode capacitor, which is not affected by environmental temperature and humidity, so the accuracy of the instrument can be guaranteed even after long-term use.
The Bottom Lines
Dielectric oil tan delta meter is a highly automated instrument for measuring the temperature rise, dielectric loss and resistance at one time. It uses medium frequency induction heating and PID temperature control algorithm. Tan Delta testing is an important step in detecting aging and deterioration of insulation materials on electrical equipment. Regular tan delta testing helps prevent electrical failures and reduce maintenance costs.
