Six-sequence component-based double circuit lines on same pole phase difference protection method

A phase difference protection and six-sequence component technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problem of difficulty in correctly determining the cross-line fault of the same pole double-circuit line, improve the protection reliability, the action principle is simple and clear, low impact effect

Inactive Publication Date: 2013-01-30
TIANJIN UNIV
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Problems solved by technology

When the double-circuit line on the same pole is regarded as two three-phase transmission lines, this principle can be directly used on the double-circuit line on the same pole as the second main protection, but it is difficult to correctly determine the cross-line fault of the double-circuit line on the same pole [2、3]

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  • Six-sequence component-based double circuit lines on same pole phase difference protection method
  • Six-sequence component-based double circuit lines on same pole phase difference protection method
  • Six-sequence component-based double circuit lines on same pole phase difference protection method

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Embodiment Construction

[0023] Such as figure 1 The impedance matrix of the fully transposed double-circuit line shown is full and difficult to solve. Six sequence transformation [2] The essence of is to decouple the mutual inductance between lines of double circuit lines and the mutual inductance of single circuit lines. First use the P matrix of formula (1) to transform the phasors of the fully transposed double-circuit line, the essence of which is to divide the six-phase current into two parts: three same vectors (through the amount, represented by T) and three Reverse amount (circulation flow, represented by F). Since the three same-vector currents have a mutual difference of 120°, the induced potentials generated in the reverse loops cancel each other out, and the induced potentials of the three self-contained loops in the same-vector loops also cancel each other out, so the same, There is no mutual inductance between the reverse vector circuits, thus decoupling the double circuit line into ...

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Abstract

The invention belongs to the field of relay protection of a power system, and relates to a six-sequence component-based double circuit lines on same pole phase difference protection method. The method comprises the following steps of: (1) acquiring six currents on each side of double-circuit lines by using current transformers at the protective installation positions on m and n sides of a circuit; (2) converting the six currents on each side of the double-circuit lines into six sequence current components by six-sequence transformation; (3) respectively subtracting corresponding sequence component a week before a fault from the same positive sequence components on the two sides to obtain respective same positive sequence fault components; (4) constructing composite currents by using the same positive sequence fault components, reverse positive sequence components and the same negative sequence components of the six sequence current components, and respectively solving the phase angles of the composite currents on the two sides; and (5) setting a phase difference protection action angle as Phi OP, determining that an internal fault exists if the absolute value of the difference between the phase angles of composite currents on the two sides of the circuit is smaller than the action angle, and otherwise, judging to be an external fault. By the method, a fault, particularly a cross-line fault, can be judged very well; and the method is easy to implement.

Description

technical field [0001] The invention relates to the field of relay protection of electric power systems, in particular to a new method for phase difference protection of double circuit lines on the same pole based on six-sequence components. Background technique [0002] On double-circuit lines on the same pole with a voltage level of 220kV and above, the protection configuration generally uses the phase-separated current difference action as the first main protection, the direction or distance longitudinal connection as the second main protection, and the three-stage distance protection as the backup protection [1] . However, the phase-separated current differential protection of the double-circuit line on the same pole needs to compare the current amplitudes at both ends of the six lines, which occupies a large number of channels, making it more likely that the reliability will be reduced due to channel failure, and the price expensive. As the second main protection, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 张艳霞邓中原刘书占
Owner TIANJIN UNIV
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