HYG power frequency test transformer without partial discharge includes barrel and high voltage insulation winding and core installed in barrel body. The upper and lower parts of barrel body are separately provided with shielding cover. The outer part of upper shielding cover of barrel body is provided with anti-halo cover. The outer part of barrel body is provided with an insulating layer, and the insulating layer is RTV or PRTV material. The utility model has an insulating layer consisting of RTV and PRTV outside the cylinder body, which significantly reduces the insulating distance of the high-voltage winding to the outer shell, greatly reduces the volume of the high-voltage winding, facilitates outdoor carrying, and has good insulation performance, good hydrophobicity, chemical corrosion resistance, high hardness, abrasion resistance and impact resistance, and can adapt to outdoor and other harsh environments.

HYG power frequency test transformer without partial discharge is mainly used to test the insulation level of various insulation materials, insulation structures and electrical products withstanding power frequency voltage. It is also used as power source of power frequency test without partial discharge for transformers, transformers and arresters. It is widely used in electrical manufacturing department, electric power operation department, scientific research institutes and universities.

HYG-50-2250 kV power frequency test transformer without partial discharge has passed the product appraisal at ministerial level, and its main technical and wood properties are in the leading position in China, reaching the advanced level of similar products in the world. At present, the single voltage of insulated barrel test transformer produced by Wuhan Huaneng Electric Company can reach 750 kV. The 750 kV insulated barrel test transformer refreshes the new era of insulated test transformer and the new era of using insulated barrel test equipment outdoors at high altitude in China and even in the world. The three indexes of voltage grade, elevation condition and shape and structure of the product are obtained, which belong to the world. First in the world.

1. The complete set of equipment has strong configuration, complete voltage and capacity series, perfect and reliable functions.

2. Successfully develop epoxy insulator without partial discharge to ensure that the system has a small amount of partial discharge, which is superior to that of peer enterprises.

3. Using high quality DQ130-30 grain oriented silicon steel sheet and 45 degree inclined seam laminate, the product waveform distortion rate and no-load current are the smallest in China.

4. Low impedance voltage, less than 5% system impedance, which meets the requirements of AC contamination test better than international regulations.

5. Adopt fast electronic protection device with high reliability.