CN113156334A - On-line detection method for broken wire of power cable - Google Patents
On-line detection method for broken wire of power cable Download PDFInfo
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- CN113156334A CN113156334A CN202110359181.7A CN202110359181A CN113156334A CN 113156334 A CN113156334 A CN 113156334A CN 202110359181 A CN202110359181 A CN 202110359181A CN 113156334 A CN113156334 A CN 113156334A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
Abstract
The invention discloses an on-line detection method for broken wires of a power cable, which comprises the following steps: firstly, the method comprises the following steps: four magnetic sensors are arranged on a cable core, are symmetrical in pairs and are distributed in a cross shape, two magnetic sensors which are symmetrically distributed along the left and right sides of the center of the cable core are a first group, and two magnetic sensors which are symmetrically distributed along the top and bottom of the center of the cable core are a second group; II, secondly: judging whether the differential amplification condition of the magnetic sensor occurs or not according to an electromagnetic theory, if so, entering a third step, and if not, entering a fourth step; thirdly, the method comprises the following steps: pulse shaping output, alarm output; fourthly, the method comprises the following steps: the invention has the advantages that the invention has no alarm when the broken wire condition is not detected, compared with the prior art, the invention has the following beneficial effects: 1. online detection and real-time alarm are realized through a magnetic sensor; 2. the detection device is arranged outside the cable, so that nondestructive measurement is performed, and the detection cost is reduced; 3. the magnetic sensor can detect according to the change of the magnetic field, and the detection sensitivity is high.
Description
Technical Field
The invention discloses an on-line detection method for broken wires of a power cable, and belongs to the field of cable detection.
Background
With the development of urban modernization, urban distribution network lines largely adopt underground cross-linked cable lines to replace overhead transmission lines, wherein the operation proportion of medium and high voltage single-core cross-linked cables with large sections and large lengths is increased day by day. The large-section single-core crosslinked cable is applied, the power transmission capacity of a single-circuit cable line can be improved, the using quantity of intermediate joints can be reduced, the cable laying and accessory installation are facilitated, the operation and maintenance cost is saved, the problem that the cable metal sheath induced voltage and induced circulation affect the safety, reliability, stability and economic operation of the cable line is also brought, the detection of the broken wire of the cable in the prior art is generally carried out in an off-line mode, the detection is inconvenient and high in cost, in addition, the real-time detection and alarm of the broken wire of the cable are difficult to carry out, and the detection time of equipment faults is long.
Disclosure of Invention
In order to solve the problems, the invention is realized by the following technical scheme: an online detection method for power cable broken wires comprises the following steps:
the method comprises the following steps: four magnetic sensors are arranged on a cable core, are symmetrical in pairs and are distributed in a cross shape, two magnetic sensors which are symmetrically distributed along the left and right sides of the center of the cable core are a first group, and two magnetic sensors which are symmetrically distributed along the top and bottom of the center of the cable core are a second group;
step two: according to an electromagnetic theory, the magnetic induction intensity around the electrified conductor is inversely proportional to the radius from the axis, whether the magneto-dependent sensor has the condition of differential amplification is judged, if yes, the step three is carried out, and if not, the step four is carried out;
step three: pulse shaping output, detecting the broken wire of the power cable and alarming output;
step four: and no alarm is given when the wire breaking condition is not detected.
Further, the step of judging whether the differential amplification occurs includes:
the first step is as follows: detecting whether the first group of magneto-dependent sensors have differential amplification, if the first group of magneto-dependent sensors have differential amplification, entering the third step, and if the first group of magneto-dependent sensors do not have differential amplification, entering the second step;
the second step is that: and detecting whether the second group of magneto-dependent sensors have differential amplification, if so, entering the third step, and if not, entering the fourth step.
Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
1. the magnetic sensor is arranged on the cable core, so that online detection and real-time alarm are realized;
2. the detection process device is arranged outside the cable, so that nondestructive measurement is performed, and the detection cost is reduced;
3. the magnetic sensor can detect according to the change of the magnetic field, and the detection sensitivity is high.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural diagram of a method for detecting a broken power cable in an online manner according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a method for detecting a wire break of a power cable according to a second embodiment of the present invention;
FIG. 3 is a flow chart of an online detection method for a broken power cable according to the present invention;
fig. 4 is a schematic structural diagram of an online detection method for a broken power cable according to a third embodiment of the present invention;
fig. 5 is a flow chart of an online detection method for a broken power cable according to the present invention.
In the figure: s1, S2, S3, S4-magnetic sensor, cable core-1.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
On-line detection method for broken wire of power cable according to embodiment of the invention
The invention provides an on-line detection method for broken wires of a power cable, which adopts the technical scheme that: the online detection method for the broken wire of the power cable comprises the following steps:
the method comprises the following steps: four magnetic sensors are arranged on a cable core, are symmetrical in pairs and are distributed in a cross shape, two magnetic sensors which are symmetrically distributed along the left and right sides of the center of the cable core are a first group, and two magnetic sensors which are symmetrically distributed along the top and bottom of the center of the cable core are a second group;
step two: according to an electromagnetic theory, the magnetic induction intensity around the electrified conductor is inversely proportional to the radius from the axis, whether the magneto-dependent sensor has the condition of differential amplification is judged, if yes, the step three is carried out, and if not, the step four is carried out;
step three: pulse shaping output, detecting the broken wire of the power cable and alarming output;
step four: and no alarm is given when the wire breaking condition is not detected.
Further, the step of judging whether the differential amplification occurs includes:
the first step is as follows: detecting whether the first group of magneto-dependent sensors have differential amplification, if the first group of magneto-dependent sensors have differential amplification, entering the third step, and if the first group of magneto-dependent sensors do not have differential amplification, entering the second step;
the second step is that: and detecting whether the second group of magneto-dependent sensors have differential amplification, if so, entering the third step, and if not, entering the fourth step.
Example one
Please refer to fig. 1 and fig. 3;
when the broken position of the cable is close to one side of the magneto-dependent sensor S2, the radius r1 of the magneto-dependent sensor S1 from the axis is reduced, the corresponding radius r2 of the magneto-dependent sensor S2 is increased, and the abnormal condition of the magnetic field can be detected through differential amplification and pulse shaping.
Example two
Please refer to fig. 2 and fig. 3;
when the broken position of the cable is close to one side of the magneto-dependent sensor S1, the radius r1 of the magneto-dependent sensor S1 from the axis is increased, the corresponding radius r2 of the magneto-dependent sensor S2 is decreased, and the abnormal condition of the magnetic field can be detected through differential amplification and pulse shaping.
EXAMPLE III
Please refer to fig. 4 and 5;
when the first group of magnetic sensors do not detect the differential amplification output, a group of magnetic sensors are added and are distributed in a cross shape with the first group of magnetic sensors, and the magnetic field abnormal condition can be obtained by detecting the differential output and pulse shaping through the two groups of magnetic sensors.
The invention solves the problems that the detection of the broken cable wire is generally carried out in an off-line mode, the detection is inconvenient and the cost is high, in addition, the real-time detection and alarm of the broken cable wire are difficult to carry out, and the equipment fault detection time is long; the detection process device is arranged outside the cable, so that nondestructive measurement is performed, and the detection cost is reduced; the magnetic sensor can detect according to the change of the magnetic field, and the detection sensitivity is high.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (2)
1. An on-line detection method for broken wires of a power cable is characterized by comprising the following steps: the online detection method for the broken wire of the power cable comprises the following steps:
the method comprises the following steps: four magnetic sensors are arranged on a cable core, are symmetrical in pairs and are distributed in a cross shape, two magnetic sensors which are symmetrically distributed along the left and right sides of the center of the cable core are a first group, and two magnetic sensors which are symmetrically distributed along the top and bottom of the center of the cable core are a second group;
step two: according to an electromagnetic theory, the magnetic induction intensity around the electrified conductor is inversely proportional to the radius from the axis, whether the magneto-dependent sensor has the condition of differential amplification is judged, if yes, the step three is carried out, and if not, the step four is carried out;
step three: pulse shaping output, detecting the broken wire of the power cable and alarming output;
step four: and no alarm is given when the wire breaking condition is not detected.
2. The method for detecting the breakage of the power cable according to claim 1, wherein the method comprises the following steps: the second step is that whether the differential amplification occurs or not comprises the following steps:
the first step is as follows: detecting whether the first group of magneto-dependent sensors have differential amplification, if the first group of magneto-dependent sensors have differential amplification, entering the third step, and if the first group of magneto-dependent sensors do not have differential amplification, entering the second step;
the second step is that: and detecting whether the second group of magneto-dependent sensors have differential amplification, if so, entering the third step, and if not, entering the fourth step.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110359181.7A CN113156334A (en) | 2021-04-02 | 2021-04-02 | On-line detection method for broken wire of power cable |
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| CN202110359181.7A CN113156334A (en) | 2021-04-02 | 2021-04-02 | On-line detection method for broken wire of power cable |
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| CN113156334A true CN113156334A (en) | 2021-07-23 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645243A (en) * | 2013-11-28 | 2014-03-19 | 南京航空航天大学 | Electromagnetic nondestructive detection system of power transmission line |
| CN103995048A (en) * | 2014-05-06 | 2014-08-20 | 太原理工大学 | Steel wire rope magnetic memory on-line detection device |
| CN207964725U (en) * | 2018-02-11 | 2018-10-12 | 西南交通大学 | A kind of continuous non-destructive testing device of Cable-in-conduit conductor local defect |
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- 2021-04-02 CN CN202110359181.7A patent/CN113156334A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645243A (en) * | 2013-11-28 | 2014-03-19 | 南京航空航天大学 | Electromagnetic nondestructive detection system of power transmission line |
| CN103995048A (en) * | 2014-05-06 | 2014-08-20 | 太原理工大学 | Steel wire rope magnetic memory on-line detection device |
| CN207964725U (en) * | 2018-02-11 | 2018-10-12 | 西南交通大学 | A kind of continuous non-destructive testing device of Cable-in-conduit conductor local defect |
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