A Line Current Differential Protection Method Based on Secondary Data Transformation
A differential protection and secondary data technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of reducing system communication traffic and large communication traffic, and achieve the ability to reduce system communication traffic, speed up the process, and withstand excessive resistance strong effect
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[0025] The present invention will be further described below in conjunction with the accompanying drawings.
[0026] Such as Figure 1-Figure 3 As shown, a line current differential protection method based on secondary data conversion, the protection method includes the following steps:
[0027] Step 1: The intelligent electronic device IED reads the three-phase current value collected from the secondary side of the current transformer in real time Among them, m represents the measured current of node m, and other nodes are defined in a similar manner.
[0028] Step 2: Use the FFT algorithm to calculate the phasors of the three-phase currents, and use the amplitude and phase to represent the three-phase current I Am ∠α Am , I Bm ∠α Bm , I Cm ∠α Cm .
[0029] Step 3: Carry out secondary data transformation on the three-phase current phasor. The transformation adopts the principle of non-uniform quantization. The non-uniformity is reflected in the division of low-valu...
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