It is the base temperature at which oil begins to stream under standard test condition. Pour purpose of transformer oil is an important property chiefly at the spots where the atmosphere is cold.
In the event that the oil temperature falls beneath the pour point, transformer oil stops convection streaming and hinder cooling in a transformer. Paraffin-based oil has a higher estimation of pour point, contrasted with Naphtha based oil, however in India like a nation, it doesn’t influence the utilization of Paraffin oil because of its warm atmosphere condition.
Pour Point test of transformer oil
Pour Point test of transformer oil mostly relies on wax content in the oil. As Paraffin-based oil has more wax content, it has a higher pour point.
Extraordinary low temperature pour point (- 45°C – 49°F and underneath) is additionally a vital quality found in the better brands of protecting oil. The low temperature pour point demonstrates the oil’s capacity to stream in outrageous chilly. Without the capacity to stream, the oil will never again have the capacity to play out its capacities in the transformer. To guarantee successful warmth scattering transformer oil ought to have a consistency of something like 90 at 150°C (+302°F).
A standout amongst the most imperative properties of transformer oil is the capacity of the oil to oppose the oxidation procedure over times of expanded use under unfriendly working conditions.
As expressed above, “Pour Point” is the temperature at which the oil ends up plastic and won’t stream. Low temperature pour point is critical for transformers and oil circuit breakers. Crisp oil ought to cement at a temperature no more prominent than a pour point temperature of – 45°C/ – 49°F. In tropical and sub-tropical atmospheres, it is worthy to utilize oil with a pour point as high as – 35°C/ – 31°F.
Working oil is permitted various deviations from the restoring temperature relying upon whether the oil is utilized in a transformer or a switch, and whether it or works inside or outside. For uncommon ice grades, oil pour point is diminished to as low as – 60°C/ – 76°F – 65°C/ – 85°F, yet the blaze point temperature is additionally decreased to between +90°C/+194°F and +100°C/+212°F. Ice review oils are not suggested for use in non-Arctic atmospheres where high warmth is a working variable.
Common details are streak point 140 °C or more prominent, pour point −30 °C or lower, dielectric breakdown voltage 28 kV (RMS) or more prominent.
It must, hence, have high dielectric quality, warm conductivity, and synthetic strength, and must keep these properties when held at high temperatures for expanded periods.
Pour point test of Transformer Oil instrument:-
Pour point is the most reduced temperature when slant put strong oil is warmed to begin to move and solidification point is the most elevated temperature when oil is cooled to stop move under managed conditions. Both are records to quantify low-temperature ease of oil.
The determinator, relevant to Standard GB/T510 and GB/T3535, is principally utilized to decide the pour point and combination purpose of transformer oil, greasing up oil and other oil. It is a perfect investigating and testing gear which has points of interest of sensible structure, unfaltering capacities, and simple activity.