During recent years a number of current stabilized D. C power supplies have been designed for earth resisivity measurement in the research of earthquake prediction. Type WL3 current stabilizer is the newest of them to supply power of up to 2.5KW at 5A to non-inductive load. The design and basic theory of WL3 current stabilizer are discussed by means of SCR for current control component, and the circuit of WL3 current stabilizer is described. Its current stability against load resistance variations or changes in three phase mains voltage is better than 1 per cent. With an initial load resistance of 100, the measured current stability at 5A is 0.9 per cent for 50 per cent reduction in load resistance and 0.8 per cent for 30 per cent change in mains voitage. The question of critical inductance is also discussed. It is suitable for geoelectric stations which have three phase mains in our country.
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高树心,高香珍,江文德. WL3型稳流电源[J].地震工程学报,1981,3(3):78-84. Gao Shuxin, Gao Xiangzhen, Jiang Wende. TYPE WL 3 CURRENT STABILIZED D. C POWER SUPPLY[J]. China Earthquake Engineering Journal,1981,3(3):78-84.