| 摘要 |
<p>PURPOSE:To improve both of reliability and earthquake proof, and to make maintenance easy, by winding primary windings which are connected to respective transmission lines and specific secondary windings round the main legs of a grounding transformer, with the leakage impedance being formed between the primary and secondary windings to serve as a neutral reactor. CONSTITUTION:Since a grounding accident occurring in a transmission line 42 results in the flow of a magnetic flux C being cut off in a main leg 22, the balance of the magnetic flux in an upper and lower yokes 32, 34 is lost to cause a magnetic flux D of zero-phase-sequence component owing to the composite vector of magnetic fluxes A and B. Therefore, the magnetic flux D of zero-phase-sequence component flows in both of side legs 28 and 30, which causes current flow through secondary windings 50, 52 and 54 to form the leakage impedance between the primary windings 44, 46, 48 and the secondary windings 50, 52, 54 which serves as a neutral reactor. Moreover, since the primary windings 44, 46, 48 or the secondary windings 50, 52, 54 are of conductor with resistivity of 5-50muOMEGA.cm, so-called resistance wire, the conductor serves as series resistor.</p> |
