Abstract
The saturated-core fault current limiter (SFCL) is widely used to limit the fault current. However, in the conventional SFCL structure, alternating current (AC) and direct current (DC) coils are wound on different loosely coupled cores. Owing to the leakage inductance, the traditional structure demonstrates relatively large demand for DC excitation power and excessive impedance during saturation. In this study, a new structure for winding closely coupled DC and AC coils on the same core in three phases is proposed to reduce the influence of leakage reactance on the SFCL performance. The leakage magnetic flux generated by both structures is analyzed by performing finite element analysis simulations and utilizing a magnetic field division method. The impedance of the limiter is measured at different DC currents and air gaps to optimize its dynamic performance. A fabricated prototype of the proposed limiter exhibits smaller steady-state losses and high current-limiting capability.
Highlights
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The results presented in Table4show that the voltage on the AC winding of the CTSFCL is 0.1104 kV, corresponding to only 1.9% of the total
Summary
Height of the upper and lower effect of magirnoenticyoflkuexs leakage on theGtlCwSFoCLstructuCroensdmucatkaflenuscxetehosefoirtfhtiehneldeuCackStaFagCnecLemsadginffeetricent. TThheeeeqquuivivaalelennttmmaaggnneettiicccciirrccuuiittoofftthheeSSFFCCLL iiss sshhoowwnn φ1 = (Ndc I dc + Nac1I ac1) /(Rc1 + Ro iinn FFiigguurr2ee 77.. Using Formula (9), it is possible to calculate the magnetic fluxes flowing through the SFCL, as follows:. Formulas (8) and (13) show that at the same AC and DC excitations, the DC component of the magnetic flux flowing through the CSFCL is apparently larger than that flowing through the SFCL. The DC current decreases to a low value that cannot keep the second core in the saturated state At this moment, both the SFCL and CSFCL exhibit the largest reactance. The absolute permeability of the core μ increases; Gu becomes much larger due to core saturation, while the magnitudes of GlCSFCL, GlSFCL1, and GlSFCL2 remain unchanged, and their effect on the SFCL impedance is reduced. During the fault period, the effect of the leakage magneto-resistance on the impedance of the SFCL is small, and the impedance values of the CTSFCL and SFCL are very close
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