標準號：BS IEC 60853-3-2002
中文標準名稱：電纜周期性和事故電流定額計算.不完全干燥土壤的一切電壓電纜用周期定額因數
英文標準名稱：Calculation of the cyclic and emergency current rating of cables - Cyclic rating factor for cables of all voltages, with partial drying of the soil
標準類型：K13
發布日期：2002/9/23 12:00:00
實施日期：2002/9/23 12:00:00
中國標準分類號：K13
國際標準分類號：29.060.20
適用范圍：This part of IEC 60853 gives a method for calculating the cyclic rating factor, for cables of all voltages, where partial drying out of the surrounding soil is anticipated. The method is based on one of the three methods published in a CIGRE document. The method is applicable to any type of cable, but it is recommended that it should be applied only to installations of one multi-core cable or to three single-core cables or to groups of circuits where the intercircuit spacing is sufficient to permit free vertical movement of soil moisture between the zones of dry soil associated with each circuit. This standard does not preclude the use of other methods of calculation where full details of the load cycle are not known. The method assumes that the entire region surrounding a cable or cables has uniform thermal characteristics prior to drying out; the only non-uniformity being that caused by drying. As a consequence the method should not be applied, without further consideration, to installations where special backfills, having properties different from the site soil, are used. note: 1 Methods for calculating cyclic ratings for buried cables with partial drying out of the surrounding soil: Electra No 145, December 1992, page 32.