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 (English Version)

Standard No.

JB/T 10181.11-2014

Language

Chinese, Available in English version

Release Date

2014

Published By

Professional Standard - Machinery

Latest

JB/T 10181.11-2014

Replace

JB/T 10181.1-2000

Scope

This part of JB/T 10181 specifies the calculation of cable carrying capacity and loss. This section applies to AC cables of all voltage levels laid in the air or soil, and to the steady-state operating conditions of DC cables 5 kV and below. The soil includes cables laid directly buried in the ground, pipes, cable trenches or steel pipes with or without local soil drying. The term "steady state" refers to a continuous constant current (100% load factor) that is just sufficient to asymptotically reach the maximum temperature of the conductor, assuming constant ambient conditions. This section provides calculation formulas for rated ampacity and losses. The values of some important parameters are not specified. Mainly divided into three categories of parameters: 　——Parameters related to the cable structure (such as the thermal resistance coefficient of some insulating materials), representative values can be selected in public publications; 　——Parameters related to environmental conditions, the value of which may change The range is larger and depends on the conditions of the laying site where the cable is used or where the cable will be used; 　——parameters negotiated between the manufacturer and the user, including the operating safety margin (such as the maximum conductor temperature).

JB/T 10181.11-2014 Referenced Document

• GB/T 12706.1-2008 Rated voltage 1kV (Um=1.2kV) to 35kV (Um=40.5kV) extruded insulated power cables and accessories Part 1: Rated voltage 1kV (Um=1.2kV) and 3kV (Um=3.6kV) cables
• GB/T 12706.2-2008 Power cables with extruded insulation and their accessories for rated voltages from 1kV(U=1.2kV>up to 35kV(U=40.5kV）.Part 2:Cables for rated voltages from 6kV(U=7.2KV)up to 30kV(U=36kV)
• GB/T 17048-2009 Hard-draw aluminium wire for overhead line conductors
• GB/T 3956-2008 Conductors of insulated cables
• GB/T 9326.1-2008 Oil-filled,paper or polypropylene paper laminate insulated,metal-sheathed cables and accessories for alternating voltages up to and including 500kV.Part 1:Test
• IEC 60027-3 Letter symbols to be used in electrical technology - Part 3: Logarithmic and related quantities, and their units

JB/T 10181.11-2014 history

• 2014 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
• 2000 JB/T 10181.1-2000 Calculation of the current rating of electric cables.Part 1:Current rating equations(100% load factor) and calculation of losses.Section 1:General

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 has been changed from JB/T 10181.1-2000 Calculation of the current rating of electric cables.Part 1:Current rating equations(100% load factor) and calculation of losses.Section 1:General.