CN107728001A - Three-phase cross cable current fault detection device - Google Patents
Three-phase cross cable current fault detection device Download PDFInfo
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- CN107728001A CN107728001A CN201710721280.9A CN201710721280A CN107728001A CN 107728001 A CN107728001 A CN 107728001A CN 201710721280 A CN201710721280 A CN 201710721280A CN 107728001 A CN107728001 A CN 107728001A
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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Abstract
The invention discloses a kind of three-phase cross cable current fault detection device.Wherein, the device includes：Six current sensors, each current sensor are used for the circulating current value for monitoring a sheath connecting line in cross connection grounding case, and six current sensors correspond with six sheath connecting lines in cross connection grounding case；Processor, it is connected with six current sensors, for being judged whether that sheath failure occurs according to the comparative result of six circulating current values and running current value.The present invention solves the technical problem detected that whether can not be broken down to three-phase cross cable in correlation technique.
Description
Technical field
The present invention relates to detection field, in particular to a kind of three-phase cross cable current fault detection device.
Background technology
With the development of urban electricity system, application of high-voltage cross-linking polythene (XLPE) cable in urban power distribution network is got over
Come more extensive, cable load also increasingly increases, but a large amount of single-core high-voltage cables put into operation so that cable grounding electric current mistake
The problem of big, also becomes to become increasingly conspicuous.
Provided according to electric power safety code, high-voltage cable metal sheath must carry out grounding.XLPE high-tension cables with
It is that the former is internal in place of the main difference of pressure common cable and uses single structure, therefore cable internal core electric current can be at it
Surrounding induces the magnetic field of alternation, so that cable metal sheath induces induced potential in the presence of alternating magnetic field.When
Cable metal sheath is grounded and during with greatly forming complete loop, and circulation will be produced on sheath.If high-tension cable metal
There is larger circulation to flow through for a long time on sheath, amount of heat will be produced thereon, this will bring 2 main danger to transmission line of electricity
Evil：1) current-carrying capacity of cable is substantially reduced；2) shorten the normal operation life-span of cable, or even trigger accident.Therefore, it is directed in engineering
Different cable runs should choose correct earthing mode, to limit the induced voltage and earth current on cable cover(ing).Often at present
Earthing mode mainly has 3 kinds of citation forms, i.e., single-end earthed, two sides earth and cross connection grounding.In single-termination place
Under formula, cable metal sheath one end is directly grounded, and the other end is grounded by voltage protector.For long distance transmission line, lead to
A very big voltage-to-ground can be induced on the protective metal shell of one end of overprotection device ground connection, therefore mode uses single-end earthed
Transmitted electricity in the short distance of mesolow cable.Under two sides earth mode, cable metal sheath both ends are directly grounded.Two sides earth
Although mode can suppress the induced voltage on protective metal shell, there is electric current to flow through all the time on cable cover(ing), produce a large amount of attached
Add loss, longtime running can cause electric cable heating, therefore single-core high-voltage cable will not use two sides earth substantially in Practical Project
Mode.
At present, the widely used cross connection grounding mode of high pressure XLPE power cables, as shown in figure 1, by 3 cable runs
Between the three-phase single-core cable protective metal shell of (A, B, C) coordinated transposition connection, Mei Ge electricity are carried out through coaxial cable, cross interconnected case
Cable road is connected position and is divided into three sections, wherein, A phase cables are divided into tri- sections of A1, A2 and A3, B phase cables be divided into B1, B2 and
Tri- sections of B3, C phase cable are divided into tri- sections of C1, C2 and C3.Should try one's best in design and meet that cable three-phase is equidistant, the segment lengths such as 3 sections
Arrangement mode.Under preferable arranging situation, due to 120 ° of induced voltage phase difference on threephase cable sheath and size is near
Patibhaga-nimitta etc., by the series connection of threephase cable sheath 3 sections of induced voltage can be made mutually to neutralize, so as to suppress high-tension cable metal
Induced voltage on sheath.
In the prior art, the monitoring technology to circulating current is that the ground connection line current for being directly grounded case is supervised mostly
Survey, cross interconnected case is not monitored generally.A kind of optional cross connection grounding case in three-phase (A, B, C) as shown in Fig. 2 hand over
Generally use coaxial cable does the connecting line of cross interconnected case and cable connector at fork interconnection.
For the technical problem that is detected of whether can not being broken down to three-phase cross cable in correlation technique, at present still
Effective solution is not proposed.
The content of the invention
The embodiments of the invention provide a kind of three-phase cross cable current fault detection device, at least to solve correlation technique
In whether three-phase cross cable can not be broken down the technical problem detected.
One side according to embodiments of the present invention, there is provided a kind of three-phase cross cable current fault detection device, should
Device includes：Six current sensors, the sheath connection that each current sensor is used to monitor in cross connection grounding case
The circulating current value of line, six current sensors correspond with six sheath connecting lines in cross connection grounding case；Processing
Device, it is connected with six current sensors, is for the comparative result judgement according to six circulating current values and running current value
No generation sheath failure.
Further, current sensor is arranged at corresponding sheath connecting line in the inlet wire port of cross connection grounding case
Place.
Further, current sensor is fixed by insulating self-adhesive water blocking tape with corresponding inlet wire port.
Further, each current sensor is power current transformer.
Further, the device also includes：Running current transformer, for monitoring running current value, wherein, processor is used
In by six circulating current values respectively compared with running current value, and according to comparative result judge whether sheath occurs therefore
Barrier.
Further, running current transformer is used for the running current value for sensing one of threephase cable.
Further, the device also includes：Modulus sampling module, with running current transformer and each power current mutual inductance
Device is connected, for being sampled to the current value of simulation and being converted to data signal.
Further, the device also includes：Memory, for storing the sampled result and processor of modulus sampling module
Judged result.
Further, processor is used for the ratio for determining each circulating current value and running current value respectively, and each two
Ratio between different circulating current values, it is different from the ratio and each two of running current value according to each circulating current value
Whether the ratio in judgement between circulating current value occurs sheath failure.
Further, processor is used to be led to according to corresponding to the breakdown judge rule judgment of the path of every section of sheath connecting line
Whether road occurs sheath failure.
In embodiments of the present invention, by setting six sensors, each current sensor is used to monitor cross interconnected connect
The circulating current value of a sheath connecting line in ground case, six current sensors and six sheaths in cross connection grounding case
Connecting line corresponds；Processor, it is connected with six current sensors, for according to six circulating current values and running current
The comparative result of value judges whether generation sheath failure, and solving whether three-phase cross cable can not occur event in correlation technique
Hinder the technical problem detected, and then realize the technology effect detected that whether can be broken down to three-phase cross cable
Fruit.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is a kind of connection diagram of three-phase cross cable of prior art；
Fig. 2 is a kind of schematic diagram of cross connection grounding case of prior art；
Fig. 3 is a kind of signal of optional three-phase cross cable current fault detection device according to embodiments of the present invention
Figure；
Fig. 4 is the signal of the optional three-phase cross cable current fault detection device of another kind according to embodiments of the present invention
Figure；
Fig. 5 is a kind of optional three-phase cross cable current fault detection device detection failure using the embodiment of the present invention
Flow chart.
Embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, it should all belong to the model that the present invention protects
Enclose.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so use
Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating herein or
Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
Cover non-exclusive include.
This application provides a kind of embodiment of three-phase cross cable current fault detection device.
The device includes six current sensors, and each current sensor is used to monitor one in cross connection grounding case
The circulating current value of sheath connecting line, six current sensors and a pair of six sheath connecting lines 1 in cross connection grounding case
Should；Processor, it is connected with six current sensors, for the comparative result according to six circulating current values and running current value
Judge whether that sheath failure occurs.
Fig. 3 is the signal of the optional three-phase cross cable current fault detection device of another kind according to embodiments of the present invention
Figure, the device is by the current transformer on cable and cross interconnected case connecting line and showing near cable connector
Field monitoring unit two parts composition.In figure 3 in shown detection means, field monitoring unit and power current transformer CT and
Running current transformer is connected, and field monitoring unit includes A/D sampling units, data analysis unit and data storage list
Member.
Specifically, Fig. 4 is a kind of Fig. 3 specific embodiment.As shown in figure 4, threephase cable is A, B, C three-phase, A phases
Cable is divided into tri- sections of A1, A2 and A3, and B phase cables are divided into tri- sections of B1, B2 and B3, and C phase cables are divided into tri- sections of C1, C2 and C3, A1 sections
The electric current of cable is Im1, and the electric current of A2 section cables is Im2, and the electric current of B1 section cables is Im3, and the electric current of B2 section cables is Im4,
The electric current of C1 section cables is Im5, and the electric current of C2 section cables is Im6, is connected between every two sections of cables by joint, as shown in figure 4,
Joint 1 is used to connect A1 and A2, and joint 2 is used to connect A2 and A3, and each current sensor can use power current transformer
CT, six sensors are respectively CTA1, CTA2, CTB1, CTB2, CTC1, CTC2.Each one joint of current sensor measurement draws
The line gone out, the electric current that CTA1 is measured are that the electric current that I1, CTA2 are measured is that the electric current that I2, CTB1 are measured is the electricity that I3, CTB2 are measured
It is that the electric current that I5, CTC2 are measured is I6 to flow the electric current measured for I4, CTC1.Optionally, each current sensor is arranged at correspondingly
Sheath connecting line at the inlet wire port of cross connection grounding case.Further, current sensor passes through insulating self-adhesive waterproof
Band is fixed with corresponding inlet wire port.
As shown in figure 4, the device can also include running current transformer CTL, running current transformer, which is used to monitor, to be transported
Row current value, wherein, processor is used to respectively tie six circulating current values compared with running current value, and according to comparing
Fruit judges whether that sheath failure occurs.Further, running current transformer is used for the running current for sensing one of threephase cable
Value.
As shown in figure 4, the device can also include modulus sampling module (A/D sampling units), with running current transformer
It is connected with each power current transformer, for being sampled to the current value of simulation and being converted to data signal.The device
Memory (data storage cell) can also be set, for storing the sampled result of modulus sampling module and the judgement knot of processor
Fruit.Further, processor can include data analysis unit, and data analysis unit is used to determine each circulating current value respectively
With the ratio between the ratio of running current value, and the different circulating current value of each two, according to each circulating current value and fortune
Whether the ratio in judgement between the different circulating current value of the ratio and each two of row current value occurs sheath failure.Further
Whether ground, processor occur sheath for the path according to corresponding to the breakdown judge rule judgment of the path of every section of sheath connecting line
Failure.As shown in figure 4, above-mentioned A/D sampling units, data analysis unit and data storage cell can be packaged in field monitoring list
In member, it is respectively connected with six sensors.
Specifically, power frequency CT transformers (including CTA1, CTA2, CTB1, CTB2, CTC1, CTC2) for being to frequency
50HZ circulating current value measures, no-load voltage ratio 200:1, and the signal for exporting 0~1A gives A/D sampling units.Running current
Transformer CTL is used to measure the cable running current of B phases, no-load voltage ratio 5000:1, and 0~1A signal is exported to A/D
Sampling unit.The current value that A/D sampling units are used to get power frequency CT transformers and running current transformer samples,
And be converted to 14bit data signal.Data analysis unit is used to simultaneously analyze the current value of A/D sampling units input
Processing, and judge whether circulating current failure occurred.Data storage cell is used to enter the analysis result of data analysis unit
Row preserves and record, and provides the search function of data.As shown in figure 4,6 power current transformers be separately mounted to it is adjacent
On the coaxial connecting line of one group of cross interconnected case, running current transformer CTL is arranged on the B phase cables of high-tension cable, power frequency
Current transformer and running current transformer are connected on the field monitoring unit at scene by signal cable respectively, A/D samplings
Unit samples to the power current transformer value and running current transformer value of input, and is converted into digital value：I1, I2,
I3, I4, I5, I6, I7, thus, the current value accessed by power current transformer is cable difference section induced electricity on connecting line
Flow valuve sum, i.e.,：I1=Im1+Im2；I2=Im2+Im3；I3=Im3+Im2；I4=Im2+Im3；I5=Im3+Im1；I6=
Im1+Im2, data analysis unit is to 7 current values I1, I2, I3 being got in synchronization, and I4, I5, I6, I7 are analyzed
Processing.
Fig. 5 is a kind of optional three-phase cross cable current fault detection device detection failure using the embodiment of the present invention
Flow chart, the three-phase cross cable current fault detection device used in the embodiment can be detection dress as shown in Figure 4
Put, be monitored (6 circulating current values) by connecting line current value to the sheath of one group of (2) cross connection grounding case, it is real
Now to the judgement of sheath malfunction, the specific method and empirical value judged sheath malfunction, by circulating current
It is worth (6) and the multilevel iudge of running current value, to realize the judgement to sheath malfunction.
As shown in figure 5, first, data analysis starts and started, then one group of current current value is obtained from A/D sampling units
I1, I2, I3, I4, I5, I6, I7, circulating current I1, I2, I3, I4, I5, I6 and running current value I7 ratio are then calculated respectively
Value：K1=I1/I7；K2=I2/I7；K3=I3/I7；K4=I4/I7；K5=I5/I7；K6=I6/I7；Sheath electricity is calculated respectively
Flow I1, I2, I3, I4, I5, the ratio of each two circulating current in I6：H1=I1/I4；H2=I1/I6；H3=I2/I4；H4=
I2/I5；H5=I3/I5；H6=I3/I6.Empirical value T1=0.16, T2=1 are set, sets tolerance threshold value R1=40%,
R2=35%.
Judge whether cable A1-B2-C3 sections occur circulating current open fault, if meeting following condition simultaneously, recognize
Circulating current open fault occurs for the section：
|K1-T1|/T1<R1；
|K2-T1|/T1<R1；
|K3-T1|/T1≥R1；
|K4-T1|/T1≥R1；
|K5-T1|/T1<R1；
|K6-T1|/T1<R1；
|H1-T2|/T2<R2；
|H2-T2|/T2≥R2；
|H3-T2|/T2<R2；
|H4-T2|/T2<R2；
|H5-T2|/T2≥R2；
|H6-T2|/T2<R2；
Judge whether cable A2-B3-C1 sections occur circulating current open fault, if meeting following condition simultaneously, recognize
Circulating current open fault occurs for the section：
|K1-T1|/T1≥R1；
|K2-T1|/T1<R1；
|K3-T1|/T1<R1；
|K4-T1|/T1<R1；
|K5-T1|/T1≥R1；
|K6-T1|/T1<R1；
|H1-T2|/T2<R2；
|H2-T2|/T2<R2；
|H3-T2|/T2≥R2；
|H4-T2|/T2<R2；
|H5-T2|/T2<R2；
|H6-T2|/T2≥R2；
Judge whether cable A3-B1-C2 sections occur circulating current open fault, if meeting following condition simultaneously, recognize
Circulating current open fault occurs for the section：
|K1-T1|/T1<R1；
|K2-T1|/T1≥R1；
|K3-T1|/T1<R1；
|K4-T1|/T1<R1；
|K5-T1|/T1<R1；
|K6-T1|/T1≥R1；
|H1-T2|/T2≥R2；
|H2-T2|/T2<R2；
|H3-T2|/T2<R2；
|H4-T2|/T2≥R2；
|H5-T2|/T2<R2；
|H6-T2|/T2<R2；
If data analysis unit exports fault message, fault message type and data are delivered into data storage cell and protected
Deposit.Then data analysis unit continues to analyze the circulating current data that subsequent time sampling obtains.Data storage cell storage event
After hindering warning message, according to system needs, higher level's monitor supervision platform is sent that information to by network or other communication modes.
Detection means provided by the invention can at least bring following beneficial effect：
1st, a kind of cross interconnected cable sheath current failure detection method and device of three-phase are proposed；
2nd, effectively cable sheath failure is monitored in real time, improves the level of security of cable operation.
It should be noted that accompanying drawing flow chart though it is shown that logical order, but in some cases, can be with
Shown or described step is performed different from order herein.
Above-mentioned device can include processor and memory, and said units can be stored in storage as program unit
In device, corresponding function is realized by the said procedure unit of computing device storage in memory.
Memory may include computer-readable medium in volatile memory, random access memory (RAM) and/
Or the form such as Nonvolatile memory, such as read-only storage (ROM) or flash memory (flash RAM), memory includes at least one deposit
Store up chip.
The order of above-mentioned the embodiment of the present application does not represent the quality of embodiment.
In above-described embodiment of the application, the description to each embodiment all emphasizes particularly on different fields, and does not have in some embodiment
The part of detailed description, it may refer to the associated description of other embodiment.In several embodiments provided herein, it should be appreciated that
Arrive, disclosed technology contents, can realize by another way.
Wherein, device embodiment described above is only schematical, such as the division of the unit, can be one
Kind of division of logic function, can there is an other dividing mode when actually realizing, for example, multiple units or component can combine or
Another system is desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or discussed it is mutual it
Between coupling or direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module
Connect, can be electrical or other forms.
In addition, each functional unit in each embodiment of the application can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and is used as independent production marketing or use
When, it can be stored in a computer read/write memory medium.Based on such understanding, the technical scheme of the application is substantially
The part to be contributed in other words to prior art or all or part of the technical scheme can be in the form of software products
Embody, the computer software product is stored in a storage medium, including some instructions are causing a computer
Equipment (can be personal computer, server or network equipment etc.) perform each embodiment methods described of the application whole or
Part steps.And foregoing storage medium includes：USB flash disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can be with store program codes
Medium.
Described above is only the preferred embodiment of the application, it is noted that for the ordinary skill people of the art
For member, on the premise of the application principle is not departed from, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as the protection domain of the application.
Claims (10)
- A kind of 1. three-phase cross cable current fault detection device, it is characterised in that including：Six current sensors, each current sensor are used to monitor a sheath connecting line in cross connection grounding case Circulating current value, a pair of six sheath connecting lines 1 in six current sensors and the cross connection grounding case Should；Processor, it is connected with six current sensors, for the ratio according to six circulating current values and running current value Relatively result judges whether that sheath failure occurs.
- 2. device according to claim 1, it is characterised in that each current sensor is arranged at corresponding sheath and connected Wiring is at the inlet wire port of the cross connection grounding case.
- 3. device according to claim 2, it is characterised in that the current sensor by insulating self-adhesive water blocking tape with it is right The inlet wire port answered is fixed.
- 4. device according to claim 1, it is characterised in that each current sensor is power current transformer.
- 5. device according to claim 4, it is characterised in that described device also includes：Running current transformer, for monitoring running current value, wherein, the processor is used for six circulating current values Respectively compared with the running current value, and generation sheath failure is judged whether according to comparative result.
- 6. device according to claim 5, it is characterised in that the running current transformer be used for sense threephase cable it One running current value.
- 7. device according to claim 5, it is characterised in that described device also includes：Modulus sampling module, it is connected with the running current transformer and each power current transformer, for mould The current value of plan is sampled and is converted to data signal.
- 8. device according to claim 7, it is characterised in that described device also includes：Memory, for storing the sampled result of the modulus sampling module and the judged result of the processor.
- 9. device according to claim 5, it is characterised in that the processor is used to determine each sheath electricity respectively Ratio between the ratio of flow valuve and the running current value, and the different circulating current value of each two, according to each institute State the ratio in judgement between the ratio of circulating current value and the running current value and the circulating current value that each two is different Whether sheath failure is occurred.
- 10. device according to claim 9, it is characterised in that the processor is used for according to every section of sheath connecting line Whether path corresponding to the breakdown judge rule judgment of path occurs sheath failure.
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| CN201710721280.9A CN107728001A (en) | 2017-08-21 | 2017-08-21 | Three-phase cross cable current fault detection device |
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| CN109298290A (en) * | 2018-12-04 | 2019-02-01 | 广东电网有限责任公司 | Fault judgment device and method and cable system |
| CN110045238A (en) * | 2019-04-09 | 2019-07-23 | 山东鲁源电气股份有限公司 | Cable shield fault determination method, device, equipment and storage medium |
| CN110850149A (en) * | 2018-08-02 | 2020-02-28 | 许继集团有限公司 | High-voltage cable metal sheath grounding monitoring method and system |
| CN112578237A (en) * | 2020-11-30 | 2021-03-30 | 国网北京市电力公司 | Cable insulation fault detection method and device and processor |
| CN115189304A (en) * | 2022-08-10 | 2022-10-14 | 广东电网有限责任公司 | Cable grounding box |
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| CN110850149B (en) * | 2018-08-02 | 2021-09-14 | 许继集团有限公司 | High-voltage cable metal sheath grounding monitoring method and system |
| CN109298290A (en) * | 2018-12-04 | 2019-02-01 | 广东电网有限责任公司 | Fault judgment device and method and cable system |
| CN110045238A (en) * | 2019-04-09 | 2019-07-23 | 山东鲁源电气股份有限公司 | Cable shield fault determination method, device, equipment and storage medium |
| CN112578237A (en) * | 2020-11-30 | 2021-03-30 | 国网北京市电力公司 | Cable insulation fault detection method and device and processor |
| CN115189304A (en) * | 2022-08-10 | 2022-10-14 | 广东电网有限责任公司 | Cable grounding box |
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