In order to study the 10 kV distribution transformer

the effect of the vegetable insulating oil on the tem-perature rise characteristics of the transformer was replaced by the vegetable insulating oil without changing thestructural design and manufacturing process of the original mineral insulating oil transformer. The S11-M-315 kVA/10 kV distribution transformer

which is exactly the same in the design and processing process

is used to fill theKaramay No. 25 mineral insulating oil and FR3 vegetable insulating oil respectively. The two transformers are oiledby Ansys CFX simulation software flow and temperature simulation of the two transformers in the simulation of thetemperature rise in the experimental differences

and through the actual temperature of two transformers on-site test

compared with the vegetable insulation oil directly replace the mineral insulation oil after the transformer tempera-ture rise performance. And the physical and chemical properties of vegetable insulating oil are used to analyze the ex-perimental data. The results show that

for the 10 kV distribution transformer

without changing the original mineralinsulating oil transformer design structure and manufacturing process conditions

with FR3 vegetable insulating oildirectly replace No.25 mineral insulating oil

vegetable insulation oil transformer overall temperature rise than min-eral insulating oil. The transformer is about 3～6 K

but still satisfy the GB 1094.2—2013"power transformer part 2:liquid immersion transformer temperature rise"standard temperature limit requirements;in the same temperatureconditions

the vegetable insulation oil in the transformer

the oil flow rate is significantly slower than mineral insu-lating oil

in this case only 1/2 of the mineral oil flow rate

which is the reason for its high temperature rise. In thetransformer oil flow velocity and temperature hot spot distribution

the vegetable insulation oil transformer and miner-al insulating oil has the same trend

the two transformer temperature points are concentrated in the upper part of themiddle

and the outer side of the high-voltage winding temperature higher than the inside of the low-voltage winding temperature;two transformer oil flow velocity maximum appears between the upper windings. Both the field tempera-ture rise test and the simulation verify the above conclusions. Finally

according to the conclusion of the study

theways to reduce the temperature rise and increase the temperature rise limit of the vegetable insulating oil distribution transformer are put forward respectively.