Design and installation method for power wire with transition point temperature characteristics
A technology of power wires and installation methods, which is applied in the direction of overhead lines/cable equipment, etc., and can solve problems such as differences in wiring data
Inactive Publication Date: 2016-03-02
STATE GRID LIAONING ELECTRIC POWER CO LTD SHENYANG POWER +2
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Problems solved by technology
When purchasing imported conductors, the tension sag of conductor stringing is provided by foreign manufacturers. Due to different design standards abroad, there are differences in the stringing data provided.
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[0038] The present invention comprises the following steps:
[0039] When the conductor temperature is lower than the transition point temperature, the calculation of the conductor tension and sag is the same as that of the ACSR. When the temperature is higher than the transition point temperature, the tension of the wire is all borne by the core wire, and the expansion coefficient and elastic modulus of the wire are only related to the core wire. The key to calculating the sag of the wire is to obtain the transition point temperature and tension.
[0040] Conductor under no tension, manufacturing temperature t 0 The length of the state is l 0 , set up this section of wire, the tension of the wire is T, the temperature is t, and the length of the wire is L. According to Hooke's law of elastic deformation in material mechanics, we get
[0041] ϵ = L - l 0 ...
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The invention discloses a design and installation method for a power wire with transition point temperature characteristics, belongs to the technical field of installation of overhead wires, particularly relates to a design and installation method for a power wire with transition point temperature characteristics and provides the design and installation method for the power wire with the transition point temperature characteristics and a good installation effect. The method comprises the steps as follows: the length of the wire is l<0> in a tension-free state at a manufacturing temperature t<0>; the wire is installed; the tension of the wire is T, the temperature is t and the length is L; a formula as shown in the specification is obtained according to the hooke's law of elastic deformation in material mechanics; in the formula, epsilon is the elongation of the unit length of the wire caused by the tension and a temperature difference; E is an integrated elasticity modulus (N / mm<2>) of the wire; A is a sectional area (mm<2>) of the wire; alpha is a comprehensive expansion coefficient (1 / DEG C) of the wire; t<0> is the manufacturing temperature of the wire; the wire length increment of the wire is equal to the sum of elastic elongation and temperature elongation; and the elongation of a core wire is equal to that of an aluminum wire.
Description
technical field [0001] The invention belongs to the technical field of installation of overhead wires, in particular to a method for designing and installing power wires with transition point temperature characteristics. Background technique [0002] Replace the steel core with a material with a much smaller expansion coefficient than the steel wire, and twist it with the outer aluminum wire to make a special wire. When the temperature of the wire is higher than the initial temperature of the factory stranding, the length of the aluminum wire will be longer than that of the core wire. As the temperature of the wire rises, the tension borne by the aluminum wire will gradually transfer to the core wire. When the temperature reaches a certain temperature, all the tension borne by the aluminum wire will be transferred to the core wire. At this time, all the tension and elongation of the wire are only related to the tension and expansion coefficient of the core wire. This tempera...
Claims
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IPC IPC(8): H02G1/02
CPCH02G1/02
Inventor鲍星辉杨长龙金鹏张宏宇张玉良关微郭洪月张津铭陈明非
OwnerSTATE GRID LIAONING ELECTRIC POWER CO LTD SHENYANG POWER