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Measuring method for armorless cable direct current leakage current

A leakage current and measurement method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of no ground current, and the leakage current detection method of armored cables cannot be applied, so as to improve the accuracy and facilitate observation. The effect of the experiment

Inactive Publication Date: 2019-11-05
刘琳
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the entire sheath of the unarmoured cable is in contact with the ground, so there is no concentrated ground current, and the leakage current detection method of the armored cable cannot be applied.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] The method for measuring the DC leakage current of unarmored cables includes the following steps:

[0019] Step S1, the measurement module, a sensor is installed at both ends and the midpoint of the target cable, and each sensor measures the DC current at each point at the same time;

[0020] Step S2, the calculation module, starting from the initial power-on time, measures once every other cycle according to step S1, and calculates the difference of the DC current between two adjacent sensors and takes the absolute value;

[0021] Step S3, the sorting module, adding the absolute values ​​obtained at the same time to obtain a time value, after obtaining several time values, arranging the several time values ​​in sequence;

[0022] Step S4, the display module displays the time values ​​arranged in chronological order by printing a paper form or directly using an electronic form.

[0023] Optionally, the period in step S2 is 10 minutes or 1 hour.

[0024] The sensor in ...

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Abstract

The invention discloses a measuring method for armorless cable direct current leakage current. The measuring method comprises the following steps: step S1, by using a measuring module, setting a sensor at two ends and the middle point of a target cable respectively, wherein each sensor is used for measuring the direct current of each point at the same moment; step S2, by using a calculation module, starting from initial conduction time, measuring once according to the step S1 at an interval of one cycle, calculating the difference value of direct current between every two adjacent sensors, andtaking absolute values; step S3, by using a ranking module, adding the absolute values obtained at the same moment to obtain moment values, after the moment values are obtained, ranking the moment values in sequence according to time series; and step S4, by using a display module, displaying the moment values arranged according to time series by printing paper tables or directly using Microsoft excels.

Description

technical field [0001] The invention relates to the measurement of cable current, in particular to a method for measuring the DC leakage current of an unarmoured cable. Background technique [0002] Unarmoured cables refer to cables without steel armor protection. The quality of the cable insulation performance is very important to ensure the safe operation of the power supply system, so how to detect the insulation performance of the cable and find the potential defects of the cable as early as possible is very necessary. Most of the current research focuses on armored cables, but few people study the insulation performance testing methods of unarmored cables. The insulation detection methods used mainly include partial discharge method, optical fiber temperature measurement method, leakage current method and so on. [0003] The leakage current in the cable is a weak DC current, and its detection requires a sensor with high sensitivity. For armored cables, the insulation...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 刘琳
Owner 刘琳
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