Pi-type equivalent circuit based direct current earth electrode line fault location method

A distance measurement method and equivalent circuit technology, which can be applied in directions such as fault locations, can solve problems such as accurate location of ground electrode line faults, and achieve the effect of simplified calculation and easy on-site implementation.

Active Publication Date: 2014-04-23
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to propose a fault location method based on a π-type equivalent circuit DC grounding pole line to solve the problem of accurate location of grounding pole line faults

Method used

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  • Pi-type equivalent circuit based direct current earth electrode line fault location method
  • Pi-type equivalent circuit based direct current earth electrode line fault location method
  • Pi-type equivalent circuit based direct current earth electrode line fault location method

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Embodiment 1

[0027] Embodiment 1: A method for fault location of a DC grounding electrode line based on a π-type equivalent circuit, 800kV DC grounding line such as figure 2 shown. The line parameters are as follows: the total length of the line is 80km, the line impedance is: 0.0231+j0.001273237Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 6.4kHz. Ground electrode line l 2 A ground fault occurs 3km away from the measuring end, and the transition resistance is 0.2Ω. The line from the fault point to the measurement end is equivalent to a π-type equivalent circuit, and the equivalent input impedance is calculated by using the single-ended voltage and current. According to the input impedance equal to the equivalent impedance of the line from the fault point to the measurement end, the fault location function is determined. The fault distance is calculated by solving the fault location function.

[0028] The specific steps of the ranging method are as follows:

[0...

Embodiment 2

[0039] Embodiment 2: A method for fault location of DC grounding electrode lines based on π-type equivalent circuits, 800kV DC grounding line such as figure 2 shown. The line parameters are as follows: the total length of the line is 80km, the line impedance is: 0.0231+j0.001273237Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 6.4kHz. Ground electrode line l 2 A ground fault occurs 30km away from the measuring end, and the transition resistance is 4Ω. The line from the fault point to the measurement end is equivalent to a π-type equivalent circuit, and the equivalent input impedance is calculated by using the single-ended voltage and current. According to the input impedance equal to the equivalent impedance of the line from the fault point to the measurement end, the fault location function is determined. The fault distance is calculated by solving the fault location function.

[0040] The specific steps of the ranging method are as follows:

[0041]...

Embodiment 3

[0051] Embodiment 3: A method for fault location of a DC grounding electrode line based on a π-type equivalent circuit, 800kV DC grounding line such as figure 2 shown. The line parameters are as follows: the total length of the line is 80km, the line impedance is: 0.0231+j0.001273237Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 6.4kHz. Ground electrode line l 2 A ground fault occurs 50km away from the measuring end, and the transition resistance is 20Ω. The line from the fault point to the measurement end is equivalent to a π-type equivalent circuit, and the equivalent input impedance is calculated by using the single-ended voltage and current. According to the input impedance equal to the equivalent impedance of the line from the fault point to the measurement end, the fault location function is determined. The fault distance is calculated by solving the fault location function.

[0052] The specific steps of the ranging method are as follows:

[...

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Abstract

The invention relates to a pi-type equivalent circuit based direct current earth electrode line fault location method which belongs to the field of power system fault location technology. According to the method, when an earth fault happens to a high-voltage direct current earth electrode line, a circuit from a fault point to a measuring end is equivalent to a pi-type equivalent circuit; input impedance is calculated by single-ended voltage and current magnitudes; a fault location function is determined according to the fact that the input impedance is equivalent to equivalent impedance of the circuit from the fault point to the measuring end; and the fault location function is solved to calculate the fault distance. Based on the pi-type equivalent model, an equivalent way is conducted on the circuit model. Calculation is simplified. Based on onsite recording data, the method provided by the invention is easy to implement on scene. Single-ended measurable voltage and current magnitudes are only needed. Data of opposite ends is not required.

Description

technical field [0001] The invention relates to a distance measurement method for DC ground electrode line faults based on a π-type equivalent circuit, and belongs to the technical field of power system protection and distance measurement. Background technique [0002] The grounding electrode line is an indispensable part of the DC transmission system. The DC system converter station is generally tens to more than one hundred kilometers away from the grounding point, and a grounding electrode lead wire connected in parallel with two conductors is usually erected between them. Due to the low voltage level of the grounding electrode line, grounding short-circuit and disconnection faults are prone to occur, which will affect the entire HVDC transmission system, resulting in unipolar blocking, or even bipolar blocking, resulting in the failure of the system to transmit power normally. Therefore, it is very important to accurately measure the location of the fault point and troub...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 束洪春黄沈峰苏玉格田鑫萃
Owner KUNMING UNIV OF SCI & TECH
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