What is the standard for oil level in oil-immersed transformers?
We all know that oil-immersed transformers work with oil-immersed transformer oil. To achieve various performances of oil-immersed transformers, it is necessary to continuously understand the various functions of oil-immersed transformers and continuously improve the performance and functions of oil-immersed transformers. Common oil-immersed transformer oil needs to be continuously measured, and the specific distance of the oil surface and the oil-immersed transformer oil need to be continuously improved. What is the specific standard for the oil level of oil-immersed transformers? Let's take a look at the specific standards for the oil level of oil-immersed transformers:
According to different situations, there are almost no oil storage cabinets for 10kV oil-immersed transformers with a capacity of 630kVA and below, so there is no need to observe the oil level; 10kV oil-immersed transformers with a voltage level of 35kV and above or a larger capacity are all equipped with oil storage cabinets. The oil level indication of the oil storage cabinet has several forms, such as connecting pipes, pointer oil level gauges, and bellows. The connecting pipe adopts the connecting vessel principle. There is a small red ball in the glass tube to indicate the oil level, which is very intuitive; some pointer-type oil level gauges directly mark the position where the pointer points to indicate the amount of oil in the oil conservator, or use different temperature corresponding curves (usually three, corresponding to different minimum ambient temperature areas) to convert the amount of oil in the oil conservator according to the pointer position; the bellows type uses the top of the bellows to indicate the normal oil level of the oil conservator corresponding to different oil temperatures (generally the oil volume of the oil conservator is about 10% of the body oil weight).
The oil level of the oil-immersed transformer can be seen from the oil conservator, commonly known as the oil pillow. The oil conservator, commonly known as the oil pillow, is a cylindrical container placed horizontally above the oil tank and connected to the oil tank of the oil-immersed transformer by a pipe. When the oil of the oil-immersed transformer expands, the oil flows from the oil tank to the oil conservator; when the oil of the oil-immersed transformer shrinks, the oil flows from the oil conservator to the oil tank. Oil-immersed transformers with voltage levels of 35kV and above or 10kV with larger capacity are all equipped with oil conservators. The oil level indication of the oil conservator includes three methods: connecting pipe, pointer oil level gauge, and bellows. The national standard GB/T6451-1995 "Technical Parameters and Requirements for Three-Phase Oil-Immersed Transformers" clearly stipulates in Article 4.4 "Oil Protection Device": For oil-immersed transformers equipped with oil conservators, the structure of the oil conservator should be convenient for cleaning the interior. The volume of the oil conservator should ensure that the oil does not overflow under full load at an ambient temperature of 40℃. When it is not put into operation at -30℃, the oil level gauge should have visible oil.
1. The connecting pipe adopts the principle of connecting vessel. There is a small red ball in the glass tube to indicate the oil level, which is very intuitive.
2. Some pointer oil level gauges directly mark the position where the pointer points to indicate the amount of oil in the oil conservator, or use different temperature corresponding curves (usually three, corresponding to different minimum ambient temperature areas: such as -30°, +20° and +40° on the oil level gauge of the oil-immersed transformer refer to the normal oil level lines of the oil-immersed transformer when the ambient temperature is -30°, +20° and +40° respectively.), and calculate the amount of oil in the oil conservator according to the pointer position.
3. The bellows type uses the top of the bellows to indicate the normal oil level of the oil conservator corresponding to different oil temperatures.
The specific standard of the oil level of the oil-immersed transformer is introduced above. The oil level of the oil-immersed transformer should be continuously tested to continuously improve the detection standard of the oil level of the oil-immersed transformer. In this way, the performance of the oil-immersed transformer will be further improved, and the efficiency and stability of the oil-immersed transformer will be more guaranteed. For more knowledge about oil-immersed transformers, please contact our manufacturers for consultation!
