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Determining method of single-core cable metal layer overvoltage

A single-core cable, determination method technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of two-phase grounding short circuit difficult to calculate, complex calculation process, taking into account, etc., to achieve good economic Benefit, high calculation accuracy, and the effect of reducing time-consuming

Active Publication Date: 2013-11-27
SOUTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GROUP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in reality, due to the many short-circuit types, it is difficult for calculation programming to take all short-circuit types into account
The second method is to use an analytical algorithm, but this method can only calculate simple short-circuit types, such as single-phase and three-phase short-circuits, and it is difficult to calculate complex two-phase-to-ground short-circuits, and the calculation process is more complicated

Method used

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  • Determining method of single-core cable metal layer overvoltage
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  • Determining method of single-core cable metal layer overvoltage

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Embodiment

[0022] After many experiments and studies, it is found that in the n wire system, such as figure 1 as shown, i 1 + i 2 +... i n The multi-conductor system with = 0 has the following flux linkage relationship:

[0023] The flux linkage between point P and n wires is:

[0024] ψ ap = μ 0 2 π [ i 1 ( ln D ∞ D 1 p ) + . . . . . . + i n ( ln D ∞ D np ...

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Abstract

The invention provides a determining method of single-core cable metal layer overvoltage. The method includes the following steps: (1) building a following matrix equation according to an electric power lead system where a single-core cable is located; (2) building a current equation of the single-core cable requiring determining of an overvoltage value according to the Kirchhoffs current law; (3) building a characteristic equation under a short circuit pattern according to the Kirchhoffs voltage law; (4) building simultaneous equations of the three equations, solving to obtain voltage difference between two ends of the single-core cable metal layer, and determining the single-core cable metal layer overvoltage according to the voltage difference between the two ends of the single-core cable metal layer. The determining method has the advantages of facilitating design of the most reasonable single-core cable, greatly saving project cost and having good economical benefit.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a method for determining the overvoltage of a metal layer of a single-core cable. Background technique [0002] In the power system, when the voltage level exceeds 35kV, most power cables use single-core cables, and the determination of overvoltage on the metal layer of single-core cables is an important content of single-core cable design. [0003] At present, there are two main methods for calculating the overvoltage of the metal layer of a single-core cable: the first method is to use an electronic computer to calculate, this method needs to calculate the positive sequence, negative sequence, and zero sequence impedance of the circuit, and use circuit principles to solve various parameters . But in fact, due to the many short-circuit types, it is difficult to take all short-circuit types into account in calculation programming. The second method is to use an analytical a...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 胡振兴李娅西齐春杨毅伟李永强
Owner SOUTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GROUP CORP