Power transmission line protection method and system based on frequency spectrum characteristic of transient component
A technology of spectrum characteristics and transmission lines, applied in emergency protection circuit devices, electrical components, fault detection according to conductor type, etc., can solve problems such as difference in operating current, slow attenuation of current transient components, and refusal of protection to operate, and achieves the computational complexity of Small, criterion-adaptive effect
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Embodiment 1
[0098] Example 1: figure 2 The fault outside the F1 point of the system shown
[0099] (1) Collect the three-phase current on both sides of the transmission line Calculate the β mode component of the current on both sides of the line, the calculation formula is Using the Fourier algorithm to calculate the β-mode current spectrum ( image 3 shown).
[0100] Calculate according to the formula
[0101]
[0102] In the formula, I(f N ) represents: current amplitude; N represents: frequency spectrum; i β Indicates: current β modulus value; n indicates: sampling value.
[0103] (2) Carry out differential calculation on the spectrum signal, set the threshold value Iset, and set the frequency value whose amplitude is smaller than Iset in the current spectrum to zero. Reserve the frequency value whose amplitude is greater than Iset in the spectrum, and set its amplitude to 1A, and set the rest to 0. The processed spectrum is as follows Figure 4 shown.
[0104] (3) Calcu...
Embodiment 2
[0105] Example 2: figure 2 Fault in the F2 point area of the system shown
[0106] (1) Collect the three-phase current on both sides of the transmission line Calculate the β mode component of the current on both sides of the line, the calculation formula is Calculate the β-mode current spectrum ( Figure 5 shown).
[0107] (2) Carry out differential calculation on the spectrum signal, set the threshold value Iset, and set the frequency value whose amplitude is smaller than Iset in the current spectrum to zero. Reserve the frequency value whose amplitude is greater than Iset in the spectrum, and set its amplitude to 1A. The processed spectrum is as follows Figure 6 shown.
[0108] (3) Calculate the frequency difference Δf at the protection point 1 1 , transmitted to protection 2, the frequency difference at protection 2 is Δf 2 , and Δf 2 -Δf 2 > fset, it is judged as an internal failure.
[0109] The present invention proposes a transmission line protection sys...
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