JB/T 10181.2-2000
Calculation of the current rating of electric cables.Part 1:Current rating equations(100% load factor) and calculation of losses.Section 2:Sheath eddy current loss factors for two circuits in flat formation (English Version)
- Standard No.
- JB/T 10181.2-2000
- Language
- Chinese, Available in English version
- Release Date
- 2000
- Published By
- Professional Standard - Machinery
- Status
- 2014-10
- Replace By
- JB/T 10181.12-2014
- Latest
- JB/T 10181.12-2014
- Scope
- This standard provides a method for calculating the eddy current loss of metal sheaths for single-core cables arranged in a three-phase double-circuit plane. There is no significant circulation in the metal sleeve when the metal sleeve is interconnected at a single point or across. If the two ends of the metal sleeve are interconnected, significant circulation of the metal sleeve will lead to a reduction in the ampacity. The calculation method for double loop circulation loss is under consideration. This method provides correction for the loss factor of the metal sheath of shared laid three-phase loop cables. For the cable parameter m (m=ω/10^7*Rs) less than 0.1, corresponding to the longitudinal resistance of the metal sheath being greater than 314μΩ/m at the system frequency of 50Hz, the correction coefficient can be ignored. Therefore, this method is applicable to most specifications of aluminum-sheathed cables, while lead-sheathed cables do not need to be taken into account unless their cross-sections are particularly large. These factors are tabulated and calculated based on the basic formula for sheath loss. Calculating these values requires specialized calculation programs that are not readily available on the general market. Simplified formulas for coefficients derived from tabular columns are under consideration.
JB/T 10181.2-2000 history
- 2014 JB/T 10181.12-2014 Electric cables.Calculation of the current rating.Part 12: Current rating equations (100% load factor) and calculation of losses.Sheath eddy current loss factors for two circuits in flat formation
- 2000 JB/T 10181.2-2000 Calculation of the current rating of electric cables.Part 1:Current rating equations(100% load factor) and calculation of losses.Section 2:Sheath eddy current loss factors for two circuits in flat formation
JB/T 10181.2-2000 Calculation of the current rating of electric cables.Part 1:Current rating equations(100% load factor) and calculation of losses.Section 2:Sheath eddy current loss factors for two circuits in flat formation was changed to JB/T 10181.12-2014 Electric cables.Calculation of the current rating.Part 12: Current rating equations (100% load factor) and calculation of losses.Sheath eddy current loss factors for two circuits in flat formation.
