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A METHOD FOR CORRECTING EFFECT OF SATURATION IN CURRENT TRANSFORMER AND AN INTELLIGENT ELECTRONIC DEVICE THEREFOR
A METHOD FOR CORRECTING EFFECT OF SATURATION IN CURRENT TRANSFORMER AND AN INTELLIGENT ELECTRONIC DEVICE THEREFOR
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机译:一种校正电流互感器饱和特性的方法及其智能电子设备
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摘要
A method for generating corrected measured current in an Intelligent Electronic Device (IED) that is a true representation of primary current in an electrical network is disclosed. The method uses regression and a first threshold on measured sampled values from CT to detect a deviation instance that indicates a possibility of saturation. Wavelet and second threshold based detection of instances of saturation is then done. Then a regression based correction that uses a dynamic correction factor is implemented in real time to obtain corrected sampled values i.e. corrected measured current. Ending of correction is done based upon a predetermined selection criterion, The generated corrected measured current is used for protection and control functions in the IED. A CT output re-generation module as a functional module in the IED for implementing the method as described above is also disclosed.
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