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Calculation method of temperature of conductors of multi-loop soil directly buried cables

A technology of cable conductors and calculation methods, applied in the field of electric power, can solve problems such as difficult to understand and complex calculation methods

Active Publication Date: 2015-07-01
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0006] In order to solve the technical problems raised by the above-mentioned background technology, the present invention aims to provide a calculation method for the conductor temperature of the multi-circuit soil directly buried high-voltage cable, which solves the problem that the traditional calculation method is difficult to understand and is relatively complicated

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  • Calculation method of temperature of conductors of multi-loop soil directly buried cables
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  • Calculation method of temperature of conductors of multi-loop soil directly buried cables

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Embodiment Construction

[0032] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] (1) Determine the two-dimensional solution area of ​​the cable and soil temperature field, and number the cables of each circuit in sequence. The determined two-dimensional solution area is surrounded by the upper, lower left and right boundaries, the upper boundary is the upper surface of the soil, the distance between the lower boundary and the deepest cable is 2m, and the distance between the left and right boundaries and the outer cable is 2m. The sequence of cable numbers and the laying of loop cables are as follows: figure 1 shown.

[0034] (2) Determine the boundary conditions and physical parameters of the solution domain of the temperature field. These parameters can be obtained from the type of cable laid and the conditions of laying.

[0035] (3) Derivation and calculation of the initial temperature T of the cable condu...

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Abstract

The invention discloses a calculation method of temperature of conductors of multi-loop soil directly buried cables. The method comprises the following steps: determining a cable and a soil temperature field two-dimensional solving region and numbering each loop of cable in sequence; determining a boundary condition and a physical parameter of the temperature field solving region; calculating initial temperature of each cable conductor under the conditions that all loops are not electrified; solving the thermal resistance parameter of each cable by comprehensively utilizing an analysis method and a definite element method, and further solving the conductor temperature rise caused by loss of the cables; calculating an interaction coefficient between every two cables, and further solving the temperature of each cable conductor caused by an external cable heat source; constructing a multi-loop soil directly buried cable conductor temperature calculation model to accurately calculate the conductor temperature of each cable. The method is suitable for various main laying forms of a current power cable, in particular a cluster laid cable lines with relative lack in research, and the calculation precision is improved while the cable conductor temperature calculation method is simplified.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a calculation method for the conductor temperature of a multi-circuit soil directly buried high-voltage cable. Background technique [0002] The cable conductor temperature is an important basis for judging the actual operating state and actual current carrying capacity of the cable. [0003] At present, there are mainly two methods for calculating the temperature of cable conductors: the analytical method of layered modeling of the cable thermal circuit with parameters such as thermal resistance and heat capacity, and the numerical method based on the principles of finite difference, boundary element, and finite element. [0004] The IEC-60287 standard based on the analytical method is currently the world's recognized cable ampacity calculation standard. The finite element method for establishing the temperature field solution domain model has been applied to ...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 沈培锋王春宁马宏忠许洪华李超群马菲菲王郁垒施恂山
Owner STATE GRID CORP OF CHINA
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