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 (English Version)

Standard No.

JB/T 10181.12-2014

Language

Chinese, Available in English version

Release Date

2014

Published By

Professional Standard - Machinery

Latest

JB/T 10181.12-2014

Replace

JB/T 10181.2-2000

Scope

This part of JB/T 10181 specifies the calculation method of metal sheath eddy current loss for single-core cables with three-phase double-circuit planar arrangement. When the metal sleeve is interconnected at a single point or cross-connection, there is no obvious circulation in the metal sleeve. If the two ends of the metal sleeve are interconnected, significant circulation of the metal sleeve will lead to a reduction in the carrying capacity. For double loop circulation loss, its calculation method is under consideration. This section is applicable to the calculation of metal sheath eddy current losses of single-core cables arranged in three-phase double-circuit planes. This method provides correction of the loss factor of the metal sheath of separately laid three-phase loop cables. For the cable parameter m less than 0.1 (m=ω/R×10), corresponding to the longitudinal resistance of the metal sheath being greater than 314 μΩ/m at the system frequency of 50 Hz, 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 special calculation programs. Simplified formulas for coefficients derived from tabular columns are under consideration.

JB/T 10181.12-2014 Referenced Document

• JB/T 10181.11-2014 Electric cables.Calculation of the current rating.Part 11: Current rating equations (100% load factor) and calculation of losses.General

JB/T 10181.12-2014 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 10181.12-2014 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 has been changed from 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.