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IEC60247 Insulating Oil Dielectric Loss and Resistivity Tester
What is insulating oil dielectric loss factor / dielectric dissipation factor?
Under the action of alternating electric field that can be generated by the AC working current, the theoretical medium and internal management will only choose to pass their own weak capacitive current, which is 90° in advance of the phase of the applied voltage, which only affects the power factor of the enterprise electrical engineering equipment, and does not produce different power economic losses. But in fact, the oil may have a study of internal space charge imbalance, or polar molecules due to electric field promotion, they will act as conductors, thereby increasing the conductive current (or leakage current) that leads to resistance. This current is in phase with the applied voltage, so it is an active current, which will cause power loss, called the "dielectric loss" of insulation oil, the ratio of conduction current to capacitance current, that is, tan delta is called the "dielectric loss factor".
Why do insulating oil dielectric loss and resistivity test?
The dielectric loss factor of transformer oil is an important index to evaluate the electrical performance of transformer oil / insulating oil, especially the effect of oil deterioration or contamination on the dielectric loss factor is more obvious. There're fewer polar substances in the new oil, so the medium loss factor is generally small, such as the national standard GB 2536-90 requires enterprises to control the loss of the medium when the insulating oil leaves the factory, not more than 0.005 (90℃). After a period of use, the medium loss factor of the oil is too large to take treatment measures, such as the use of vacuum filtration or silica gel adsorption treatment and other measures to remove water, microorganisms, oxidation products, external particles and polar substances in the solid insulation materials dissolved in the oil.
IEC60247 Insulating Oil Dielectric Loss and Resistivity Tester
What is insulating oil dielectric loss factor / dielectric dissipation factor?
Under the action of alternating electric field that can be generated by the AC working current, the theoretical medium and internal management will only choose to pass their own weak capacitive current, which is 90° in advance of the phase of the applied voltage, which only affects the power factor of the enterprise electrical engineering equipment, and does not produce different power economic losses. But in fact, the oil may have a study of internal space charge imbalance, or polar molecules due to electric field promotion, they will act as conductors, thereby increasing the conductive current (or leakage current) that leads to resistance. This current is in phase with the applied voltage, so it is an active current, which will cause power loss, called the "dielectric loss" of insulation oil, the ratio of conduction current to capacitance current, that is, tan delta is called the "dielectric loss factor".
Why do insulating oil dielectric loss and resistivity test?
The dielectric loss factor of transformer oil is an important index to evaluate the electrical performance of transformer oil / insulating oil, especially the effect of oil deterioration or contamination on the dielectric loss factor is more obvious. There're fewer polar substances in the new oil, so the medium loss factor is generally small, such as the national standard GB 2536-90 requires enterprises to control the loss of the medium when the insulating oil leaves the factory, not more than 0.005 (90℃). After a period of use, the medium loss factor of the oil is too large to take treatment measures, such as the use of vacuum filtration or silica gel adsorption treatment and other measures to remove water, microorganisms, oxidation products, external particles and polar substances in the solid insulation materials dissolved in the oil.
