A method and system for fault identification of multi-circuit transmission lines on the same tower

A transmission line and fault identification technology, applied in the field of fault identification, can solve the problems of too many non-contact magnetic sensors, incomplete consideration, and single-circuit lines, so as to improve the accuracy of fault identification, save costs, and reduce the number Effect

Active Publication Date: 2022-01-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the current research on non-contact methods has problems such as too many magnetic sensors required, incomplete consideration, and most of them are on single-circuit lines.

Method used

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  • A method and system for fault identification of multi-circuit transmission lines on the same tower
  • A method and system for fault identification of multi-circuit transmission lines on the same tower
  • A method and system for fault identification of multi-circuit transmission lines on the same tower

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Embodiment approach

[0182] As an optional implementation manner, the phase current fault condition determination module specifically includes:

[0183] Phase current short-circuit fault determination unit, used if γ i >5σ i , then the fault condition of the i-th phase current is a short-circuit fault.

[0184] Phase current disconnection fault determination unit, used if γ i i , then the fault condition of the i-th phase current is an open circuit fault.

[0185] Phase current no fault determination unit, used if 0.5σ i ≤γ i ≤5σ i Then the fault condition of the i-th phase current is no fault; where γ i Indicates the reconstructed current of the i-th phase current at any iron tower, σ i Indicates the current of the transmission line where the i-th phase current is located when there is no fault.

[0186] In view of the advantages and existing problems of the non-contact method, this method constructs the electromagnetic relationship equations (measuring point position model) of the line, ...

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Abstract

The invention relates to a fault identification method and system for multi-circuit transmission lines on the same tower. The method comprises: obtaining the position of each support on each iron tower, the position of the transmission line where the current of each phase is located, and the position of each measuring point on each iron tower; for any iron tower in the transmission line, the condition of the positive operator matrix of the iron tower The minimum number is the goal, and the position of each support on the iron tower is constrained to construct the position model of the measuring point; the positive operator matrix is ​​a matrix composed of the integral of the position of the transmission line where the i-th phase current is located and the position of the y-th measuring point on the iron tower ; Solve the measuring point position model to obtain the optimal measuring point matrix of each iron tower; obtain the magnetic induction intensity at each measuring point in the optimal measuring point matrix; determine the fault condition of the transmission line by the magnetic induction intensity. The invention uses a small number of magnetic sensors, saves cost, and improves the accuracy of fault identification.

Description

technical field [0001] The invention relates to the technical field of fault identification, in particular to a fault identification method and system for multi-circuit transmission lines on the same tower. Background technique [0002] Multi-circuit transmission lines on the same tower are widely used in high-voltage transmission line projects such as West-to-East Power Transmission due to their strong transmission capacity and high cost performance. However, multi-circuit transmission lines on the same tower also have various fault types, complex coupling situations, and complex fault characteristics. Therefore, it is necessary to study the fault identification and location of multi-circuit transmission lines on the same tower, so that it can accurately find the fault point after the fault occurs, and repair it in time to ensure the safe and stable operation of the entire power system. [0003] Traditional fault identification methods are mainly divided into identification...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor李坚黄琦尹韬胡维昊张真源蔡东升井实易建波孙敏张蔓
OwnerUNIV OF ELECTRONICS SCI & TECH OF CHINA