Tracking and locating device for earth fault of overhead line
A technology for ground faults and overhead lines, applied in the field of power systems, can solve the problems that fault tracking and positioning are not really realized, technology is difficult to implement, and implementation is difficult
Active Publication Date: 2012-05-16
黄洪全
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Problems solved by technology
The disadvantage of this idea is that it is technically difficult to re-break down the fault point and maintain a stable fault current by manual methods, especially when the fault is arc high-impedance grounding, it is more difficult to achieve, and the grounding fault of overhead lines is mostly is the arc high resistance ground
Therefore, no relevant products have come out so far, and the idea of manually reproducing the fault state and tracking and locating the fault has not really been realized.
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[0025] figure 1 It is a schematic diagram of the working principle of the pulse current detection method. The arrow in the figure indicates the direction of the pulse current when the fault point passes through, and the pulse current at any point on the line enters the earth through the ground fault point. When the pulse current is detected at the detection point 1, the direction of the pulse current is clockwise, the detected signal is positive, and the ground fault point is in front of the detection point 1. When the pulse current is detected at the detection point 2, the direction of the pulse current is counterclockwise, the detected signal is negative, and the ground fault point is behind the detection point 2.
[0026] figure 2 It is a schematic diagram of the working principle of the pulse voltage detection method. When the ground fault point is broken down, the voltage of each point on the line will drop, but the voltage drop rate is different. The pulse voltage d...
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The invention, which belongs to the power system field, relates to a tracking and locating device for an earth fault of an overhead line. A natural characteristic of a line fault point that is broken down again is utilized; after the power supply is cut off due to a line fault, a high voltage direct current is injected into the faulty line and the fault point is broken down again; a hand-held tracking and locating instrument is used to detect an impulse current or pulse voltage signal along the circuit when the fault point is broken down, so that the position of the fault point can be accurately and rapidly determined; and therefore, a problem that tracking and locating can not be carried out on a fault when there is an arc high resistance earth fault is solved. When the device is used with combination of a current alternating current tracking technology, tracking and locating on a fault can be carried out under any circumstances.
Description
technical field [0001] The invention belongs to the field of power systems, and in particular relates to a grounding fault tracking and positioning device for overhead lines. Background technique [0002] The electrical energy generated by the power plant is often transported to the user by the power supply overhead line. When a ground fault occurs on an overhead line, in order to avoid the expansion of the fault, the power supply department usually stops the power supply of the faulty line and replaces the faulty part. Since the overhead line is long and has many branches, after a power outage, the fault phenomenon disappears immediately, and it is difficult to manually find the fault point. It is of great significance to shorten the troubleshooting time and improve the power supply quality of the power grid by artificially recreating the fault state and tracking and locating the fault. [0003] Chinese patent CN2650145 proposes a "DC open circuit, AC tracking" idea, firs...
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CPCY04S10/522Y04S10/52
Inventor 黄洪全
Owner 黄洪全