Distribution network cable fault on-line distance measuring equipment and distance measuring method

A cable fault and distance measuring device technology, which is applied in the direction of measuring devices, fault locations, radio wave measurement systems, etc., can solve the problems of complex operation and large volume of fault distance measuring devices, and achieve simple test operation and facilitate online monitoring , Reduce the effect of transmission loss and distortion

Inactive Publication Date: 2011-04-06
DANDONG XINTAI ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This offline fault location device is bulky and complicated to operate, and the reflected wave identification requires skilled staff to complete
There is currently no device that can accurately test the location of power cable faults under power supply conditions

Method used

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  • Distribution network cable fault on-line distance measuring equipment and distance measuring method
  • Distribution network cable fault on-line distance measuring equipment and distance measuring method
  • Distribution network cable fault on-line distance measuring equipment and distance measuring method

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Embodiment Construction

[0023] The structure of the present invention will be described in detail in conjunction with the accompanying drawings.

[0024] A distribution network cable fault online distance measuring device, such as figure 1 As shown, it is composed of current sensor, signal detection circuit, high-speed data acquisition, signal transmission section and host computer.

[0025] The circuit connections of each device are as figure 2 As shown, the current sensor is composed of a Ross coil, and can work in a high frequency band with a frequency of 3MHz.

[0026] The output signal of the current sensor is connected to the input terminal of the signal detection circuit. The signal detection circuit not only performs the work of transmitting the signal from the current sensor to the high-speed data acquisition card, but also performs the work of identifying the fault signal and sending the data acquisition start signal to the data acquisition card. (The output and input terminals of the si...

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Abstract

The invention relates to a distribution network cable fault on-line distance measuring equipment and a distance measuring method. The output/input end of a current sensor of which the working band is 3MHz, is connected with the output/input end of a signal detection circuit; the output/input end of the signal detection circuit is connected with a 100MHz A/D conversion module; the 100MHz A/D conversion module is connected with the signal output/input end of an HFBR series fiber optic transceiver; the signal output/input end of the HFBR series fiber optic transceiver is connected with a cushion circuit; and the cushion circuit is connected with a host computer. The hybrid photoelectric current sensor can be used for conveniently acquiring fault transient signals of high-tension cables and any other power supply cables. The traveling wave method of fault transient signals is used for measuring the fault distance of high resistance, low resistance, periodic and flashover fault and any other faults. Since the invention can be used for identifying the cable initial fault and measuring the fault position under the conditions of power supply, people can repair and maintain the cable in advance, thereby obviously reducing economic loss due to power cut.

Description

technical field [0001] The invention relates to a power grid measuring device and a measuring method, in particular to a device and a measuring method for measuring the fault location of a power cable under the condition of power supply. Background technique [0002] With the rapid development of modern economy, more and more cable power supply methods are used. However, due to many reasons, power cable lines often fail during operation. Since the cables are buried underground, when a failure occurs, it is difficult to find the fault point in time and accurately. Different from overhead lines, the fault mechanism and fault types of power cables are more complicated. Generally, there are not many permanent faults, but there are more periodic faults and flashover faults where the insulation materials of power cables are gradually aging. At present, the widely used cable fault distance measuring device is to first add low and high voltage pulse signals to the fault cable in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01S17/08
CPCY04S10/522Y04S10/52
Inventor 王洪蛟巩志强
Owner DANDONG XINTAI ELECTRIC
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