Safe operation and service life of dry-type transformers, transformer winding insulation depends largely on safe and reliable. Winding temperature exceeds the insulation temperature to withstand dielectric breakdown, is one of the main causes of the transformer is not working properly, so the operating temperature of the transformer monitoring and alarm control is very important. ⑴ automatic fan control: take the temperature signal embedded in the Pt100 resistance thermistor temperature measurement at low voltage winding hottest. Transformer load increases, the operating temperature rises, when the winding temperature reaches 110 ℃, the system automatically starts the cooling fan; when winding temperature as low as 90 ℃, the system automatically stops the fan. ⑵ over-temperature alarm, trip: embedded in the low voltage winding through the nonlinear PTC thermistor temperature resistance winding or core temperature signal acquisition. When the transformer winding temperature continues to rise, if reached 155 ℃, the system output over temperature alarm; if the temperature continues to rise up to 170 ℃, the transformer can not continue to run the secondary protection circuit required to transport over-temperature trip signal, should the transformer quick trip. Liaocheng Xinxing Transformer Co., Ltd. 0635-8247297 18265578768 (http://www.xxbyqc.com) located in the beautiful northern Shuicheng - Liaocheng. An area of ??124,670 square kilometers; the building area 36,700 square meters; total assets of 365 million yuan. 2011 sales revenue of 370 million yuan; profits of 33.48 million yuan. Has a staff of 586. One senior technical staff 19, 84 mid-level technical staff, leading products 220 kV and below oil-immersed power transformers, amorphous alloy transformer (http://www.lzbianyaqi.com), wound core transformer, 35 kV 10 kV SCB10, SG10 dry-type power transformers, SH15 amorphous alloy dry-type transformers and user requirements for mining transformers, transformer rectifier transformer Liaocheng http://www.xxbianyaqi.com. Annual production capacity of 10 million KVA ...... Mobile: 18265578768 15666651312 Tel: 0635-8247297 Fax: 0635-8247296 Contact: E-mail on behalf of Legends: 602083482@qq.com