| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a countermeasure against snow accretion which functions effectively even when the power flow in an overhead transmission line is low. <P>SOLUTION: A magnetic wire 3 is wound spirally around the outer circumference of an overhead transmission line 2 and rings 4 of magnetic body are fixed, at an interval, onto the magnetic wire 3 wound spirally. Since the diameter of the magnetic wire 3 is limited within the windable range and the ring 4 can compensate for deficiency in calorific value, such a problem as winding around a wire becomes very difficult due to rigidity when a thick wire is used in order to ensure calorific value is eliminated. Even in case of low power flow, snow accreting on the wire is prevented from becoming a big lump by local snow melting action by the ring on the heated magnetic wire 3 wound spirally, and since a small lump of snow falls, risk of damaging a facility under the transmission line is eliminated. The magnetic wire wound spirally and the ring act in combination to exhibit snow melting effect thus achieving a countermeasure against snow accretion which is effect even for low power flow. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
