Patent
Bus protection method based on fault current wavelet decomposition transient energy
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TLDR
In this article, the authors proposed a busbar protection method based on fault current wavelet decomposition transient energy, which can distinguish a circuit fault and a bus bar fault reliably, and is not only simple in principle but also reliable and effective.Abstract:
The invention relates to a busbar protection method based on fault current wavelet decomposition transient energy, and belongs to the technical field of electric power system relay protection When a circuit or a busbar breaks down, transient current of each circuit on the busbar in a short time window after the fault occurs is extracted, fault-containing phase-mode current is taken after phase-mode transformation to perform wavelet transform; a wavelet energy value of each circuit is solved, whether the fault is a busbar fault or not is differentiated through comparing transient current energy of each circuit, and if the fault is a busbar fault, a busbar circuit in which the fault occurs is judged according to a transient high-frequency energy ratio of a connected circuit The busbar protection method can distinguish a circuit fault and a busbar fault reliably, and is not only simple in principle but also reliable and effectiveread more
Citations
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Transient energy protection method for fault current of direct current transmission line
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References
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High resistance earthing fault detection method based on transient traveling wave
TL;DR: In this article, the authors proposed a method for testing high impedance faults based on transient traveling waves and belongs to the electric system protecting and controlling technique field, the method comprises faults actuating and faults testing, wherein the faults actuations adopts transient traveling wave electric quantity to judge actuating, the faults testing is actuated through comparing the transient travelling waves electric quantity and a threshold value, the fault testing results are output through an algorithm of fault detection.
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Phase selection method of single loop fault based on one-end current temporary state informations
TL;DR: In this article, the authors proposed a method for detecting wire fault phase based on interrelation of magnitude of energy function in three modulus transient current in high frequency, which can detect fault phase especially under high-ohmic resistor grounding.
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TL;DR: In this article, a high-voltage DC power transmission line single-end protecting method based on wavelet energy relative entropy (WER) was proposed for single-ended power transmission lines.
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TL;DR: In this article, the error line selection of B single-phase earth in the distribution system mounted with A and C two phase current mutual-inductor only including the following steps: using A, C phase current IMU connected with circuits on a same bus bar to turn the large current in the circuit to small currents of 1amp or 5amp, then converting the small current to -3.5- 3.5V small voltage signals by a modulus collecting board and record and store the digital signal containing transient high frequency current character information, utilizing a small transformation method to deal with