Study And Application Of The Main Transformer On-line Insulates Monitor In The Second Electric Power Plant Of Hancheng

The second electric power plant of Hancheng is the largest thermal power plant which haS both the single and the total capacity in northwest of China. Which planed the total capacity is 4×600MW, parted two period. The first project was finished in 2005, including 2 stages 6×100MW generators group, raised up by transformer transport to high-voltage net, preferring power 4×109kW per year, the maxim loading is 12×105kW.The safe circulate of the electrified barbed wire netting is very important, especially normal circulate of the transformer substation equipments has the important meaning to assurance circulating of the electrified barbed wire netting. The main transformer of transformer substation is the main equipment of the electric power system, these courtiers and reliability of the electric power system is directly influenced by its reliability. In order to guarantee the safe circulate of the electric power system, the insulation monitoring of the main transformer is necessarily reinforced.The on-line monitor principle and applied researches of dielectric loss of a tube of main transformer, with the dielectric loss for the on-line monitor principle method of the current and voltage leads zero phase shifts: the error margin and the source analyzed to produce the reason of the system interferences, put forward the in keeping with spot the method of the actual anti-interference. Measuring the data actually explains possibility of on-line monitor system of dielectric loss of the transformer's tube. The research of the on-line monitoring of grounding electric current in iron core presents the new method that adopts diverse long-string sensor.The on-line monitor principle and applied researches of six kinds of dissolved gases in the transformer oil is the on-line chromatogram monitoring method based on various gases characteristic of the permeable film and multi-transmit gas sensitive component. Measuring the data actually analyzes the stability and the credibility.The research that develops the on-line monitor of the main transformer expanded the comprehensive automation no body's station to lay a foundation for the second electric power plant of Hancheng, provided the dependable basis. Circulate the analytical indicated: The on-line monitoring of the main transformer is reasonable and credible. It can judge the insulate condition of the main transformer.