Recently, the State Grid Hubei Electric Power Research Institute combined ± 1100kV UHV field test technology innovative converter transformer low-frequency heating power supply for the first time in South Hami ± 800kV UHVDC converter transformer applications and achieved great success. The successful application of this technology completely solves the engineering problems caused by the fact that the winter low temperature causes the thermal oil of the converter transformer to take longer time to heat up and the low temperature start of the converter transformer.

State Grid Hubei Electric Power Company Red Collar Power Research Institute team after nearly a year of tackling tough grams, the use of AC-AC frequency design of low frequency power 0.01 ~ 3Hz, the volume is the most advanced power frequency heating 1 / 20, weight 1/30, with a high degree of integration, security and stability, and can run for a long time.

According to the pre-validated technical proposal, the research team conducted a heating test on a ± 800kV converter transformer in the Hami South converter station using low-frequency heating power under the common witness of the manufacturer and well-known domestic experts in the industry. With the gradual decrease in frequency, the active current injected into the transformer gradually increased, weighing 405 tons of UHV transformer under the control of the experimenter, the oil temperature rise at a rate of 1 ℃ every 5 minutes, field experts praise! , The heating effect of the device is extremely significant, heating time is only one-tenth of a large oil machine, and the main technical indicators of the converter during the heating measurable and controllable.

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