CN110346633A - Magneto-electric current sensor and cable fault localization method - Google Patents
Magneto-electric current sensor and cable fault localization method Download PDFInfo
- Publication number
- CN110346633A CN110346633A CN201910709271.7A CN201910709271A CN110346633A CN 110346633 A CN110346633 A CN 110346633A CN 201910709271 A CN201910709271 A CN 201910709271A CN 110346633 A CN110346633 A CN 110346633A
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- Prior art keywords
- cable
- magneto
- current sensor
- electric current
- magnetic core
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
Abstract
The present invention provides a kind of magneto-electric current sensor and cable fault localization methods, additionally provide a kind of magneto-electric current sensor device.The magneto-electric current sensor includes: multiple magnetic cores, multiple coils and signal processing and analysis processing module, wherein the direction of each magnetic core is different in the multiple magnetic core；Each coil is wrapped in the multiple magnetic core on a mutually different magnetic core in the multiple coil；The signal processing and analysis processing module is electrically connected with the multiple coil respectively, for being detection signal by the induced current Vector modulation in the multiple coil.Through the invention, it solves the problems, such as that the relevant technologies are difficult to cable fault in accurate detection cable well, simplifies the installation of current sensor, improve the detection sensitivity to cable fault in cable shaft.
Description
Technical field
The present invention relates to Cable fault examination fields, in particular to a kind of magneto-electric current sensor, magneto-electric electricity
Spread induction device and cable fault localization method.
Background technique
Cable fault positioning mainly has two kinds of offline accurate positioning method and online deciding field method at present.
Offline accurate positioning method includes Low Voltage Impulse Method, high arc-over method, audio frequency method, sound magnetic-synchro method etc., off-line process
It needs to operate after line outage, trouble-shooting point need to be carried out from the end Injection Signal unlocked using pertinent instruments.This kind of side
Method fault location is slow, and power off time is long, meets among GIS terminal or cable that there are inconvenience when connector to unlock, and the high pressure injected
The disadvantages of signal easily punctures fault point again and causes cable secondary damage.
Existing cable section Fault Locating Method, generally at the nodes such as cable distribution box, ring network cabinet, installation failure refers to
Show device, minimum positioning section is ring network cabinet (or distribution box) at a distance from ring network cabinet (or distribution box), the faulty section that can be judged
Between it is excessive.
In the related art, often apart from multiple cables between ring network cabinet (or distribution box) and ring network cabinet (or distribution box)
Fault section can be narrowed down to the grain between cable shaft and cable shaft if installing fault detector in cable shaft by well
Degree.However, inventor has found in the course of the research, the current transformer that punching is installed in cable shaft may cause cable
Damage, and the installation and maintenance of straight-through current transformer are also not convenient；Also, often more than one cable in cable shaft is more
There is also different laying directions for bar cable, and therefore, the induction current sensor of traditional single magnetic core is difficult to accurately examine
All cables in cable shaft are surveyed, and lead to the case where detecting failure.
Summary of the invention
The present invention provides a kind of magneto-electric current sensor, magneto-electric current sensor device and cable fault positioning sides
Method, at least to solve the problems, such as that the relevant technologies are difficult to cable fault in accurate detection cable well.
In a first aspect, the present invention provides a kind of magneto-electric current sensors, comprising: multiple magnetic cores, multiple coils and letter
Number collection analysis processing module, wherein
The direction of each magnetic core is different in the multiple magnetic core；
Each coil is wrapped in the multiple magnetic core on a mutually different magnetic core in the multiple coil；
The signal processing and analysis processing module is electrically connected with the multiple coil respectively, and being used for will be in the multiple coil
Induced current Vector modulation be detection signal.
Optionally, the quantity of the magnetic core is two.
Optionally, the quantity of the magnetic core is three, wherein three magnetic cores are mutually perpendicular to two-by-two.
Optionally, the well lid bottom of cable shaft is arranged in the magneto-electric current sensor, or cable shaft is arranged in
On side wall, or it is arranged in the cable duct of cable bottom.
Second aspect, the present invention provides a kind of magneto-electric current sensor devices, which is characterized in that including first aspect institute
The magneto-electric current sensor stated, further includes wireless communication module, wherein the wireless communication module and the magneto-electric electric current
Sensor electrical connection.
It optionally, further include satellite positioning module.
The third aspect, the present invention provides a kind of cable faults using magneto-electric current sensor described in first aspect
Localization method, characterized by comprising:
The electricity of inducting that cable in the multiple Coil Detector cable under test well of the magneto-electric current sensor generates
Stream；
The induced current Vector modulation that the magneto-electric current sensor arrives the multiple Coil Detector is detection signal；
According to the detection signal, judge whether the cable in the cable under test well breaks down.
Optionally, according to the detection signal, judging whether the cable in the cable under test well breaks down includes:
Transient analysis is carried out to the detection signal, judges whether the cable in the cable under test well breaks down.
Optionally, the method also includes:
In the case where determining the cable in the cable under test well and breaking down, the magneto-electric current sensor will
The detection signal reporting is to background server, so that the background server is based on multiple magneto-electric current sensors
The detection signal of report determines fault section.
Magneto-electric current sensor, magneto-electric current sensor device and the cable fault provided through the embodiment of the present invention is fixed
Position method, using the magneto-electric current sensor for including: multiple magnetic cores, multiple coils and signal processing and analysis processing module,
In, the direction of each magnetic core is different in the multiple magnetic core；Each coil is wrapped in the multiple in the multiple coil
In magnetic core on a mutually different magnetic core；The signal processing and analysis processing module is electrically connected with the multiple coil respectively,
For being detection signal by the induced current Vector modulation in the multiple coil, solves the relevant technologies and be difficult to accurately detect electricity
In cable well the problem of cable fault, the installation of current sensor is simplified, improves the detection spirit to cable fault in cable shaft
Sensitivity.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of magneto-electric current sensor according to an embodiment of the present invention；
Fig. 2 is the schematic diagram that magneto-electric current sensor according to an embodiment of the present invention is mounted on well lid bottom；
Fig. 3 is the structural schematic diagram of magneto-electric current sensor device according to an embodiment of the present invention；
Fig. 4 is the flow chart of cable fault localization method according to an embodiment of the present invention；
Fig. 5 is showing for the current waveform before and after the failure that magneto-electric current sensor according to an embodiment of the present invention detects
It is intended to.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below, in order to make mesh of the invention
, technical solution and advantage be more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is further retouched in detail
It states.It should be understood that described herein, the specific embodiments are only for explaining the present invention, is not intended to limit the present invention.For ability
For field technique personnel, the present invention can be implemented in the case where not needing some details in these details.It is right below
The description of embodiment is used for the purpose of better understanding the present invention to provide by showing example of the invention.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or equipment for including a series of elements not only includes those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or equipment institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including described want
There is also other identical elements in the process, method, article or equipment of element.
A kind of magneto-electric current sensor is provided in the present embodiment, and Fig. 1 is magneto-electric according to an embodiment of the present invention
The structural schematic diagram of current sensor, as shown in Figure 1, the magneto-electric current sensor includes: multiple magnetic cores 1,2 and of multiple coils
Signal processing and analysis processing module 3, wherein the direction of each magnetic core is different in multiple magnetic cores 1；It is each in multiple coils 2
Coil is wrapped in this multiple magnetic core 1 on a mutually different magnetic core；Signal processing and analysis processing module 3 respectively with multiple lines
2 electrical connection of circle, for being detection signal by the induced current Vector modulation in multiple coils 2.
Above-mentioned signal processing and analysis processing module 3 is preferably using signal processings such as well known integrated circuit or single-chip microcontrollers
The peripheral circuit (such as power circuit etc.) of module and signal processing module is constituted.
Zero-sequence current refer in three-phase or two-phase cable the phasor of each phase current and.Cable in cable shaft is in fault-free
In the case where, each phase current phasor of every cable and be always zero；If detecting each phase current phasor of cable and being not zero,
Then illustrate that there are failures for cable.The situation that multi-cable is laid in different directions is also similar, i.e., all electricity in cable shaft
In all trouble-free situation of cable, each phase current phasor of all cables and be always zero；If detecting all cables in cable shaft
Each phase current phasor and be not zero, then illustrate that there are faulty cables in cable shaft.
And the zero-sequence current of the non-zero generated in cable by failure generates the electric field of variation, the electric field of variation around cable
Generate changing magnetic field；According to the principle of electromagnetic induction, the variation of magnetic flux generates electric current in closing coil in closing coil,
To realize the detection of cable fault.Closing coil is wrapped on magnetic core, and the effect of magnetic core is the magnetic field reinforced in coil.
In the present embodiment, when being parallel to each other in order to avoid the cable of failure and unidirectional magnetic core, the magnetic flux in coil is very
It is small or be zero, and lead to not the problem of detecting the zero-sequence current that the cable of the failure generates, use multidirectional magnetic core, line
The structure being wrapped on multidirectional magnetic core is enclosed, it is different to a plurality of laying direction which can be improved magneto-electric current sensor
Cable zero-sequence current detection sensitivity, solve the problems, such as that the relevant technologies are difficult to cable fault in accurate detection cable well.
Also, the magneto-electric current sensor of electromagnetic induction principle, which does not need cable, can generate induced current across coil, avoid
Using the problem that the installation of current sensor caused by centre path current sensor, maintenance are difficult.
Optionally, the quantity of above-mentioned magnetic core is two.Preferably, complete in the plane and cable shaft where the two magnetic cores
Portion's cable is all not parallel.
Optionally, the quantity of above-mentioned magnetic core is three, wherein these three magnetic cores are mutually perpendicular to two-by-two.Using mutual two-by-two
Three perpendicular magnetic cores, no matter the laying direction of the cable in cable shaft, when certain cable generates the zero-sequence current of non-zero,
Generate induced current at least one coil that will necessarily be wound outside these three magnetic cores, thus guarantee detect be in cable shaft
It is no that there are the cables of failure.
Magneto-electric current sensor provided in this embodiment does not use punching structure, therefore its setting position is cleverer
It is living.Optionally, magneto-electric current sensor can be set in the well lid bottom of cable shaft, or the side wall of cable shaft is arranged in
On, or be arranged in the cable duct of cable bottom.Magneto-electric current sensor is shown in FIG. 2, cable shaft is set
The schematic diagram of well lid bottom.
A kind of magneto-electric current sensor device is additionally provided in the present embodiment.Fig. 3 is magnetic according to an embodiment of the present invention
The structural schematic diagram of current sensing device, as shown in figure 3, the device includes the magneto-electric current sensor of first aspect
10, it further include wireless communication module 20, wherein wireless communication module 20 is electrically connected with magneto-electric current sensor 10.Channel radio
Letter module 20 is used to the detection signal that magneto-electric current sensor 10 detects being sent to background server.Optionally, above-mentioned
Wireless communication module 20 include but is not limited to: the other similar nothing such as mobile communication module or bluetooth module, WIFI module
Line communication module.
Optionally, magneto-electric current sensor device can also include satellite positioning module, the satellite positioning module include but
It is not limited to: the satellite positioning modules such as big-dipper satellite module, global position system GPS.The satellite positioning module of the present embodiment is used for
Determine the position for the cable shaft that magneto-electric current sensor device is installed.Since magneto-electric current sensor device is being installed to cable
After well, position be it is fixed, without often mobile, therefore can also be using manual type record magneto-electric current sense dress
Cable shaft number or cable shaft position where setting.
A kind of application drawing 1 or magneto-electric current sensor shown in Fig. 3 or magneto-electric electricity are additionally provided in the present embodiment
Spread the cable fault localization method of induction device.Fig. 4 is the flow chart of cable fault localization method according to an embodiment of the present invention,
As shown in figure 4, the process includes the following steps:
Step S401, the electricity of inducting that the cable in multiple Coil Detector cable under test wells of magneto-electric current sensor generates
Stream；
Step S402, the induced current Vector modulation that magneto-electric current sensor arrives multiple Coil Detectors are detection letter
Number；
Step S403 judges whether the cable in cable under test well breaks down according to detection signal.
Through the above steps, using the magneto-electric current sensor with multidirectional magnetic core can in accurate detection cable well it is more
It whether there is faulty cable in bar cable, solve the relevant technologies and be difficult to asking for cable fault in accurate detection cable well
Topic.
Optionally, in step S403, can be judged in cable under test well by carrying out transient analysis to detection signal
Whether cable breaks down.As shown in figure 5, current sensor will test to institute in the middle part of a such as Fig. 5 if cable breaks down
The sharp waveform shown, before and after fault point the sharp waveform portion polarity of wave on the contrary, therefore by the transient signal and
The judgement of transient signal polar character can determine cable whether cable shaft section belonging to failure and failure.
Optionally, at least a cable is deposited after a failure in determining cable shaft, and magneto-electric current sensor can be with
Module will test signal reporting to background server, so that background server is passed based on multiple magneto-electric electric currents by wireless communication
The detection signal that sensor reports determines fault section.By the above-mentioned means, cable fault section is narrowed down to cable shaft and cable
Between well, to improve the efficiency of determining cable fault position.
In conclusion relative to the electric current for using cable in current transformer detection cable well in the related technology, electric current
Mutual inductor needs to be sleeved on cable run, gos deep into cable shaft, and installation is inconvenient, and later period O&M and replacement are also pretty troublesome；This
Inventive embodiments acquire cable zero-sequence current using magneto-electric current sensor, and sensor is not necessarily to be sleeved on cable, but can
It with the other elements Venus integrated design with device, is installed below cable well lid, installation and O&M are convenient.For cable shaft
Under have the case where a plurality of cable, and direction is not necessarily consistent, can not ensure magnetic core and the vertical problem of all cables；To understand
The certainly above problem, the embodiment of the present invention is based on electromagnetic induction principle, non-using the magneto-electric current sensor with multidirectional magnetic core
Contact induction measures cable zero-sequence current, can guarantee that the magnetic line of force is as much as possible and pass through core cross section, promote sensitivity；It is inciting somebody to action
After the testing result of cable shaft is uploaded to background server, the fault section that all cables in underground may be implemented in background server is fixed
Position, fault section are positioned as the distance between cable shaft and cable shaft, and section is accurate, and location efficiency is high.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of magneto-electric current sensor characterized by comprising at multiple magnetic cores, multiple coils and signal processing and analysis
Manage module, wherein
The direction of each magnetic core is different in the multiple magnetic core；
Each coil is wrapped in the multiple magnetic core on a mutually different magnetic core in the multiple coil；
The signal processing and analysis processing module is electrically connected with the multiple coil respectively, for by the sense in the multiple coil
Raw current phasor synthesizes detection signal.
2. magneto-electric current sensor according to claim 1, which is characterized in that the quantity of the magnetic core is two.
3. magneto-electric current sensor according to claim 1, which is characterized in that the quantity of the magnetic core is three,
In, three magnetic cores are mutually perpendicular to two-by-two.
4. magneto-electric current sensor according to claim 1, which is characterized in that the magneto-electric current sensor setting
In the well lid bottom of cable shaft, perhaps it is arranged on the side wall of cable shaft or is arranged in the cable duct of cable bottom.
5. a kind of magneto-electric current sensor device, which is characterized in that including magnetoelectricity according to any one of claims 1 to 4
Formula current sensor further includes wireless communication module, wherein the wireless communication module and magneto-electric current sensor electricity
Connection.
6. magneto-electric current sensor device according to claim 5, which is characterized in that further include satellite positioning module.
7. a kind of cable fault localization method using magneto-electric current sensor described in any one of Claims 1-4,
Be characterized in that include:
The induced current that cable in the multiple Coil Detector cable under test well of the magneto-electric current sensor generates；
The induced current Vector modulation that the magneto-electric current sensor arrives the multiple Coil Detector is detection signal；
According to the detection signal, judge whether the cable in the cable under test well breaks down.
8. cable fault localization method according to claim 7, which is characterized in that according to the detection signal, judge institute
It states the cable in cable under test well and whether breaks down and include:
Transient analysis is carried out to the detection signal, judges whether the cable in the cable under test well breaks down.
9. cable fault localization method according to claim 7, which is characterized in that the method also includes:
In the case where determining the cable in the cable under test well and breaking down, the magneto-electric current sensor will be described
Signal reporting is detected to background server, is reported for the background server based on multiple magneto-electric current sensors
Detection signal determines fault section.
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| CN201910709271.7A CN110346633A (en) | 2019-08-02 | 2019-08-02 | Magneto-electric current sensor and cable fault localization method |
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| CN201910709271.7A CN110346633A (en) | 2019-08-02 | 2019-08-02 | Magneto-electric current sensor and cable fault localization method |
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Cited By (2)
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| CN113985106A (en) * | 2021-10-28 | 2022-01-28 | 贵州鑫湄纳米科技有限公司 | Direct current mutual inductance sensor |
| CN115144704A (en) * | 2022-09-02 | 2022-10-04 | 深圳永贵技术有限公司 | Fault detection method, device and equipment for cable production and storage medium |
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Application publication date: 20191018 |