Sampling method for particle-size test of ultrahigh-pressure insulating oil

Abstract

The invention provides a sampling method for the particle-size test of ultrahigh-pressure insulating oil. The sampling method is characterized by adopting the following steps: (1) a latex pipe with a glass pipe at the tail end is connected to a sampling valve, the sampling valve is opened for washing a sampling pipeline; (2) a special sampling bottle for the particle size test is arranged on a working platform surface in a clean environment, a sealing cover of the sampling bottle is removed, a clean cover with a hole at the top part seals and covers the sampling bottle, and the glass pipe is inserted to the bottom part of the sampling bottle from the hole in a sealing manner; (3) the sampling valve is opened, an oil sample flows into the sampling bottle to the position 0.5-1cm away from the sealing cover of the sampling bottle, the sealing cover is lifted to the bottom surface of the sealing cover and is slightly higher than a bottle opening of the sampling bottle, so that the oil sample overflows but does not come into contact with the bottom surface of the sealing cover and the overflowing of the oil sample is maintained for 3-8S; (4) the clean cover with the glass pipe is taken away, and then the clean sealing cover of the sampling bottle covers the sampling bottle, thus finishing the sampling. The sampling method provided by the invention has the beneficial effects that the operation is simple, the ultrahigh-pressure insulating oil can be sampled conveniently, no pollution is caused in the sampling process of the insulating oil, and further the accuracy of a detection result is guaranteed.

Description

technical field [0001] The invention provides a sampling method for ultra-high voltage insulating oil particle size test, which belongs to the field of electric power oil sampling. Background technique [0002] The particle size in insulating oil is an important supervisory index reflecting the cleanliness of oil products. With the continuous increase of the capacity of large transformers, the insulation distance of various parts of the equipment is gradually reduced, and the control of particle size in oil is becoming more and more important. EHV, UHV The requirement for particle size of insulating oil is also becoming more and more prominent. [0003] The permissible field strength of insulating oil is closely related to the total amount of suspended particles, so 1000kV transformer insulating oil has higher requirements on particle size than 500kV transformer insulating oil. Insulating oil for UHV transformers requires ≤1000 particles larger than 5 μm in 100 mL of oil be...

AI Technical Summary

Problems solved by technology

Particles may be introduced during the sampling process of insulating oil, which directly affects the test results. In order to ensure the accuracy of particle size test results, a sampling technology dedicated to UHV insulating oil is urgently needed to ensure the safety of the insulating oil sampling process. Pollution

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