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In power systems, railway systems, and large petrochemical plants and mines, companies have a large number of electrical equipment. Most of their internal insulation is of oil-filled insulation type. The dielectric strength of insulating oil is a routine test that must be measured. In order to meet the needs of the market, our company has independently developed and produced a series of dielectric strength testers for insulating oil in accordance with the national standard GB/T507-2002, the industry standard DL429.9-91 and the latest power industry standard DL/T846.7-2004. This instrument takes a single-chip microcomputer as the core, realizes all the test automation, has high measurement accuracy, greatly improves work efficiency, and greatly reduces the labor intensity of the staff. At the same time, the instrument has a small appearance and is convenient to carry.