Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines
A transmission line, double-circuit technology on the same tower, applied in the direction of phase sequence/synchronous indication, etc., can solve the problems of unreasonable phase sequence arrangement of conductors, unbalanced three-phase current in the transmission system, and low level of counter-attack lightning resistance
Active Publication Date: 2013-08-07
STATE GRID CORP OF CHINA +1
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[0003] The invention provides a method for determining the phase sequence arrangement of the conductors of the double-circuit transmission line on the same tower, which solves the unreasonable arrangement of the conductor phase sequence of the existing double-circuit transmission lines on the same tower, which leads to unbalanced three-phase currents and counterattacks in the transmission system Technical issues with low lightning resistance
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[0026] Concrete implementation process of the present invention is as follows:
[0027] 1. Firstly, according to the tower type, phase sequence arrangement and actual line length, establish a simulation unbalanced current calculation model.
[0028] 2. Calculate the positive, negative and zero-sequence currents of the double-circuit transmission line on the same tower, as well as the unbalance degree of zero-sequence and negative-sequence currents.
[0029] 3. Change the phase sequence arrangement of the conductors of the double-circuit transmission line on the same tower until all 36 phase sequence arrangements are calculated;
[0030] 4. Establish a single-circuit and double-circuit line counter-attack lightning resistance level calculation model, and calculate the single-circuit and double-circuit line counter-attack lightning resistance level of the phase sequence arrangement calculated in 3.
[0031] 5. According to the sorting of the current unbalance degree and the sor...
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The invention discloses a method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines. By the aid of the method, the problem of highlighted imbalance of three-phase currents of a transmission system due to an existing unreasonable phase sequence arrangement mode of conducting wires of same-tower double-circuit transmission lines is solved. The method includes selecting a phase sequence arrangement mode of the conducting wires of the same-tower double-circuit transmission lines according to a tower type used by the same-tower double-circuit transmission lines and lengths of actual circuits, and then computing positive-sequence currents, negative-sequence currents and zero-sequence currents of the two circuits of the same-tower double-circuit transmission lines by an electromagnetic transient calculation process; and respectively computing imbalance degrees of the zero-sequence currents of the I circuit and imbalance degrees of the zero-sequence currents of the II circuit in all the phase sequence arrangement modes of the conducting wires of the same-tower double-circuit transmission lines so as to determine that the phase sequence arrangement mode, which corresponds to the lowest imbalance degrees of the zero-sequence currents, of the conducting wires is the optimal phase sequence arrangement mode of the conducting wires of the same-tower double-circuit transmission lines. The method for determining the optimal phase sequence arrangement mode of the conducting wires of the same-tower double-circuit transmission lines has the advantages of simplicity and practicality.
Description
technical field [0001] The invention relates to a method for determining the phase sequence arrangement of the conductors of a double-circuit transmission line on the same tower, in particular to how to arrange the phase sequence of the transmission conductors on the double-circuit transmission line on the same tower to achieve low current imbalance and lightning resistance A method for determining the phase sequence arrangement of high-level conductors. Background technique [0002] With the continuous acceleration of my country's urbanization process and the rapid growth of electricity load, a large number of short-distance double-circuit transmission lines on the same tower appear in the power grid. Such double-circuit transmission lines on the same tower are generally erected without transposition. The problem of unbalanced three-phase current in the system caused by its phase sequence arrangement is becoming more and more prominent. Phase sequence arrangement can not on...
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Inventor 唐震张友富张悦梁建伟赵云峰张健刘永鑫陈广君王皑
Owner STATE GRID CORP OF CHINA