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Method and apparatus for accurate measurement of pulsed electric currents utilizing ordinary current transformers
Method and apparatus for accurate measurement of pulsed electric currents utilizing ordinary current transformers
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机译：利用普通电流互感器精确测量脉冲电流的方法和装置
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摘要
A voltage source connected in the secondary circuit of a current transformer is controlled so as to provide a secondary current that is accurately and continuously proportional to a primary current that is either pulsed d-c electric current or pulsed a-c electric current. Similar to U.S. Pat. No. 6,180,697, the voltage source is controlled so as to compensate for the voltage drop caused by secondary current flowing through secondary circuit impedances, thereby reducing the effective burden of the secondary circuit. However, to prevent the accumulation of error when measuring pulsed currents that are not symmetrical, the present invention turns the burden-reducing compensation off whenever secondary current is near zero amperes, thereby providing for the decay of current error and magnetic flux, so that current error remains very small and the current transformer does not saturate. The primary application is thought to be in the accurate measurement and control of pulsed electric current utilizing an ordinary current transformer to provide isolation from the primary circuit.
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