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Comprehensive fault positioning method of transmission line

A positioning method and technology of transmission lines, applied in directions such as fault locations, can solve the problems of large data transmission volume and high communication system requirements, and achieve the effects of reducing communication burden, improving accuracy and speeding up data transmission speed.

Inactive Publication Date: 2015-11-25
UNIV OF SHANGHAI FOR SCI & TECH
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AI Technical Summary

Problems solved by technology

The existing zero-sequence current method needs to upload the zero-sequence current sampling value of each detection point to the system master station. The data transmission volume is large, and the time synchronization must be maintained, which requires high requirements on the communication system.

Method used

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  • Comprehensive fault positioning method of transmission line
  • Comprehensive fault positioning method of transmission line
  • Comprehensive fault positioning method of transmission line

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Experimental program
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Embodiment Construction

[0032] Transient zero-sequence current characteristics:

[0033] Such as figure 1 Shown is a zero-sequence equivalent network diagram when a ground fault occurs in a neutral point grounded system through an arc-suppression coil, in which the arc-suppression coil switch is in the off state. In the figure: L is the arc suppressing coil, S is the generator winding. A, B, C, D are the line S 1 4 current detection points on the i 0S i 02 i 03 are respectively flowing through the generator and the line S 2 , line S 3 The instantaneous value of the zero-sequence current. i 0A i 0B i 0C i 0D are the instantaneous values ​​of the zero-sequence current flowing through points A, B, C, and D respectively. i C1 i C2 Respectively, AB segment, CD segment zero-sequence capacitance current to ground. but:

[0034] i 0A + i 0S + i 02 + i 03 =0(1)

[0035] i 0A = i C1 + i 0B (2)

[0036] Let the fault occur on line S 1 Point F, the fault instant, is equivalent to attac...

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Abstract

The invention relates to a comprehensive fault positioning method of a transmission line. When it is detected that a single-phase grounding fault occurs in a power transmission system, Prony fitting is carried out on zero-sequence currents of detection points within T / 4 after the fault, a dominant prony component of the transient zero-sequence currents is extracted, and the amplitude, phase, frequency and attenuation factor of the dominant component are uploaded to a system main station; the relative entropy of adjacent detection points is calculated, and a fault section is positioned according to the characteristic that the waveforms of zero-sequence currents of two points at the same side of the fault point is high in similarity and the waveforms of zero-sequence currents of two points at the two sides of the fault point is low in similarity; and in the positioned fault section, the fault distance is measured by utilizing an injection method. Thus, the upload data bulk is reduced, main characteristics of current signals are not lost, the communication pressure is reduced, and the fault positioning precision is improved.

Description

technical field [0001] The invention relates to a power system fault diagnosis technology, in particular to a power transmission line fault comprehensive positioning method. Background technique [0002] In my country's 3-35kV distribution network system, the low-current grounding operation mode is widely used. When a single-phase ground fault occurs, the transient characteristics are not obvious, making it extremely difficult to locate the location or interval of the fault. Existing fault location methods can be divided into fault location method and fault section location method. [0003] The fault location method can finally locate the specific location of the fault on the transmission line by injecting a signal into the system (S injection method), or using the transient traveling wave generated by the fault point (traveling wave method), but when the distance of the transmission line is long Or when the wave impedance changes, the positioning accuracy is not high. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 李然月王朝立王刚宋晓明王雪
Owner UNIV OF SHANGHAI FOR SCI & TECH
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