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Electric cables - Calculation of the current rating - Part 1-2: Current rating equations (100 % load factor) and calculations of losses - Sheath eddy current loss factors for two circuits in flat formation
| 분야 | TC 20 : Electric cables |
|---|---|
| 적용범위 | IEC 60287-1-2:2023 provides a method for calculating the eddy current losses in the metallic sheaths of single-core cables arranged as a three-phase double circuit in flat formation. The sheaths are bonded at one point or are cross-bonded so that there are no significant sheath circulating currents. Where metallic sheaths are bonded at both ends there are significant circulating currents which result in a lower current-carrying capacity. A method of calculating circulating current losses for double circuits is provided in IEC 60287-1-3. The method descibed in this document provides coefficients which are applied as corrections to the loss factors for the sheaths of one isolated three-phase circuit. These corrections are negligible for cables where the parameter m is less than approximately 0,1 (m = ω/(Rs · 107)), which corresponds to a sheath longitudinal resistance higher than 314 µΩ/m at 50 Hz. Consequently, the method is used for most sizes of aluminium-sheathed cables, but is not required for lead-sheathed cables unless they are unusually large. The coefficients are provided in tabular form and have been computed from fundamental formulae for sheath losses, the evaluation of which calls for expertise in computer programming which will possibly not be readily available in general commercial situations. The development of simplified formulae for some of the tabulated coefficients is under consideration. Losses for cables in a single circuit is covered in IEC 60287-1-1. |
| 국제분류(ICS)코드 | 29.060.20 : 케이블 |
| 페이지수 | 30 |
| Edition | 2.0 |
| No. | 표준번호 | 표준명 | 발행일 | 상태 |
|---|---|---|---|---|
| 1 | IEC 60287-1-2:2023 | Electric cables - Calculation of the current rating - Part 1-2: Current rating equations (100 % load factor) and calculations of losses - Sheath eddy current loss factors for two circuits in flat formation | 2023-05-12 | 표준 |
| 2 | IEC 60287-1-2:1993 | Electric cables - Calculation of the current rating - Part 1: Current rating equations (100 % load factor) and calculations of losses - Section 2: Sheath eddy current loss factors for two circuits in flat formation | 1993-12-09 | 구판 |
IEC 60287-2-2:1995 - Electric cables - Calculation of the current rating - Part 2: Thermal resistance - Section 2: A method for calculating reduction factors for groups of cables in free air, protected from solar radiation 상세보기
IEC 60287-3-3:2007 - Electric cables - Calculation of the current rating - Part 3-3: Sections on operating conditions - Cables crossing external heat sources 상세보기
IEC 60287-3-2:2012 - Electric cables - Calculation of the current rating - Part 3-2: Sections on operating conditions - Economic optimization of power cable size 상세보기
IEC 60287-3-1:2017 - Electric cables - Calculation of the current rating - Part 3-1: Operating conditions - Site reference conditions 상세보기
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IEC 60287-1-3:2023 - Electric cables - Calculation of the current rating - Part 1-3: Current rating equations (100 % load factor) and calculation of losses - Current sharing between parallel single-core cables and calculation of circulating current losses 상세보기
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