CN108646143A - A kind of single-core power cables fault detect structure and its fault detection method based on circulation measurement - Google Patents
A kind of single-core power cables fault detect structure and its fault detection method based on circulation measurement Download PDFInfo
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- CN108646143A CN108646143A CN201810764170.5A CN201810764170A CN108646143A CN 108646143 A CN108646143 A CN 108646143A CN 201810764170 A CN201810764170 A CN 201810764170A CN 108646143 A CN108646143 A CN 108646143A
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- phase
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- principal piece
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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
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
Abstract
The present invention relates to a kind of single-core power cables major insulation fault detect structures and its fault detection method based on circulation detection, circulation detection will be carried out for the cable cover(ing) under cross connection grounding mode, circulating current in sheath value is measured in this case, by the several groups circulating data comparison on circuit, according to the circulation characteristic under different faults earth point, and then carry out breakdown judge and positioning.Entire detection process is simple, and calculation amount is small, and required measuring apparatus is simple, can be with on-line checking.
Description
Technical field
The present invention relates to a kind of single-core power cables field of fault detection, more particularly to a kind of single measured based on circulation
Power cable major insulation failure and sheath Earth Fault Detection structure and its fault detection method.
Background technology
With the development of urban electric power cable system, 110kV crosslinked polyethylene single high voltage power cables are in city power distribution
Application in net is more and more extensive, and cable load also increasingly increases, but a large amount of single-core high-voltage cable puts into operation so that electric
The excessive problem of cable earth current also becomes to become increasingly conspicuous.
Compared with mode single-end earthed and two sides earth mode, cross connection grounding mode can effectively reduce and inhibit
Induced voltage on protective metal shell, and then within a certain range by earth current control.
When cable occurs to break down in outer jacket breakage or grounding box, cable cover(ing) earthing mode changes, and makes
It is abnormal to obtain earth current.Major accident may occur if taking measures not in time.Therefore, the high-tension cable of earth current is carried out
Status assessment is necessary.
The detection method of cable metal sheath multipoint earth faults have insulation resistance method, offline under impulse method, direct current it is high
Flashover method and impulse HV flashover method etc. are pressed, but not highly desirable and be unable to on-line measurement.
Invention content
According to the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to：Offer one kind can overcome above-mentioned
Defect can carry out the single-core power cables fault detect structure of cable earth fault detection and positioning measured based on circulation.
The technical solution adopted by the present invention to solve the technical problems is：The single electric power electricity measured based on circulation
Cable fault detect structure, including a, b, c three-phase, it is characterised in that：A, multiple sheaths are respectively set on b, c three-phase, be divided into (1),
(2), a, b, c three-phase of the cross interconnected principal piece of (3) section, each principal piece have the cross interconnected minimal segment of m, n, k to be handed over by lead-out wire
Fork interconnection, the head end of every section of cross interconnected principal piece a, b, c three-phase and end ground connection.
Further preferably, on the head end and end ground path of every section of cross interconnected principal piece a, b, c three-phase, it is connected to electricity
Current transformer shares 6, to monitor circulation value per principal piece.
Advantageous effect possessed by the present invention is：The single-core power cables Earth Fault Detection measured based on circulation
Structure and its fault detection method will carry out circulation monitoring for the cable cover(ing) under major insulation failure, measure in this case
Circulating current in sheath value compares the several groups circulating data on circuit, according to the circulation characteristic under different faults earth point, Jin Erjin
Row breakdown judge and positioning.
Description of the drawings
Fig. 1 is the cable under test exemplary plot under the cross connection grounding mode of the present invention.
Specific implementation mode
The embodiment of the present invention is described further below in conjunction with the accompanying drawings：
As shown in Figure 1, this hair the present embodiment is related to a kind of single-core power cables Earth Fault Detection measured based on circulation
Structure and its fault detection method, including a, b, c three-phase, it is characterised in that：A, multiple sheaths are respectively set on b, c three-phase, point
For (1), (2), the cross interconnected principal piece of (3) section, a, b, c three-phase of each principal piece have the cross interconnected minimal segment of m, n, k by drawing
Outlet is cross interconnected, the head end of every section of cross interconnected principal piece a, b, c three-phase and end ground connection, every section of cross interconnected principal piece a, b, c
On the head end and end ground path of three-phase, it is connected to current transformer, 6 are shared per principal piece.
Based on the single-core power cables fault detection method that circulation measures, include the following steps：
Step 1 measures each time each phase head end circulating current in sheath value at cable grounding end, and measures each time each phase fortune simultaneously
Row circulation value；
Step 2 observes each phase circulation value, and under normal circumstances, each phase circulation should be close to 0, if circulation mutually occur larger for certain
Situation, if this is mutually n-th time x phase, i.e. phase head end circulating current in sheath Isnx＞ 0, it can be determined that the phase sheath and its concatenated sheath
There are earth faults, and then may determine that its abort situation, and judgment mode is as follows：
1) according to cross interconnected section of sequence, it is respectively I to flow through circulation to current transformer1a1、I1a2、I1b1、I1b2、I1c1、
I1c2；I2a1、 I2a2、I2b1、I2b2、I2c1、I2c2；I3a1、I3a2、I3b1、I3b2、I3c1、I3c2。
2) relay protector operating position is observed, judges the fault phase of single-phase fault.If single-phase fault leads to a, phase is moved
Make, then judges that single-phase fault is happened at a phases.
3) 18 current sensor faults moment front and back circulation value measured is observed, if there is no in cross interconnected principal piece 6
The circulation value that a current transformer measures is each about 0, then can determine whether that failure is happened in cross interconnected principal piece (3).It is handed over if existing
The circulation value that 6 current transformers measure in fork interconnection principal piece is each about 0, then it is mutual from this intersection to can determine whether that single-phase fault is happened at
Join in the nearest and another cross interconnected principal piece close to power end of principal piece.
4) it observes in cross interconnected principal piece, circulation peak value after the generation single-phase fault that 6 current transformers measure, if I2a1、
I2b1、 I2c1、I2a2、I2b2、I2c2Abnormal increase and wherein I2b1、I2a2The circulation peak that relatively other 4 current transformers measure
It is worth relatively small, then failure judgement is happened at cross interconnected minimal segment k sections of the cross interconnected principal piece.
5) it observes in cross interconnected principal piece, circulation peak value after the generation single-phase fault that 6 current transformers measure, if I2a1、
I2c1、 I2b2、I2c2Abnormal increase and wherein I2c1、I2b2The circulation peak value that relatively other 2 current transformers measure is relatively
Small, then failure judgement is happened at cross interconnected minimal segment n sections of the cross interconnected principal piece.
6) it observes in cross interconnected principal piece, circulation peak value after the generation single-phase fault that 6 current transformers measure, if I2a1、
I2c2Abnormal to increase, then failure judgement is happened at cross interconnected minimal segment m sections of the cross interconnected principal piece.
For single time three-phase single-core cable in the present embodiment by certain there are single-phase fault, as shown in Figure 1, detecting step is such as
Under：
1,18 current sensor faults moment front and back circulation value measured is observed, if 6 electricity in cross interconnected principal piece (3)
The circulation value I that current transformer measures3a1、I3b1、I3c1、I3c1、I3c1With I3c1It is each about 0, then it is mutual to can determine whether that failure is happened at intersection
Join in principal piece (2).
2, observation relay protector action, if single-phase fault leads to a, phase acts, and judges that single-phase fault is happened at a phases.
3, in cross interconnected principal piece (2), circulation peak value after the generation single-phase fault that 6 current transformers measure, if I2a1、
I2c1、I2b2、I2c2Abnormal increase and wherein I2c1、I2b2The circulation peak value that other opposite 4 current transformers measure is relatively
Small, then failure judgement is happened at cross interconnected minimal segment n sections of the cross interconnected principal piece.
Described in this specification above content is only illustrations made for the present invention.Technology belonging to the present invention
The technical staff in field can make various modifications or additions to the described embodiments or by a similar method
It substitutes, content without departing from description of the invention or beyond the scope defined by this claim should all belong to this
The protection domain of invention.
Claims (3)
1. a kind of single-core power cables fault detect structure measured based on circulation, including a, b, c three-phase, it is characterised in that：
A, multiple sheaths are respectively set on b, c three-phase, are divided into (1), (2), the cross interconnected principal piece of (3) section, a of each principal piece,
B, c three-phases have the cross interconnected minimal segment of m, n, k cross interconnected by lead-out wire, the head of every section of cross interconnected principal piece a, b, c three-phase
End and end ground connection.
2. the single-core power cables fault detection method according to claim 1 measured based on circulation, it is characterised in that：Institute
On the head end and end ground path of every section of cross interconnected principal piece a, b, c three-phase stated, it is connected to current transformer, it is total per principal piece
There are 6.
3. a kind of fault detect using the single-core power cables fault detect structure measured based on circulation described in claim 2
Method, it is characterised in that include the following steps：
Step 1 measures each time each phase head end circulating current in sheath value at cable grounding end, and measures each time each phase operation ring simultaneously
Flow valuve；
Step 2 observes each phase circulation value, and under normal circumstances, each phase circulation should be close to 0, if certain the larger feelings of circulation mutually occurs
Condition, if this is mutually n-th time x phase, i.e. phase head end circulating current in sheath Isnx＞ 0, it can be determined that the phase sheath and its concatenated sheath are deposited
In earth fault, and then it may determine that its abort situation, judgment mode is as follows：
1) cross interconnected every section is numbered respectively in order；
2) relay protector operating position is observed, judges the fault phase of single-phase fault.If single-phase fault leads to a, phase acts,
Judge that single-phase fault is happened at a phases；
3) 18 current sensor faults moment front and back circulation value measured is observed, if there is no 6 electricity in cross interconnected principal piece
The circulation value that current transformer measures is each about 0, then can determine whether that failure is happened in cross interconnected principal piece (3).Intersect mutually if existing
The circulation value that 6 current transformers measure in connection principal piece is each about 0, then can determine whether that single-phase fault is happened at from this cross interconnected master
In the nearest and another cross interconnected principal piece close to power end of section；
4) it observes in cross interconnected principal piece, circulation peak value after the generation single-phase fault that 6 current transformers measure, if I2a1、I2b1、
I2c1、I2a2、I2b2、I2c2Abnormal increase and wherein I2b1、I2a2The circulation peak value that relatively other 4 current transformers measure is opposite
Smaller, then failure judgement is happened at cross interconnected minimal segment k sections of the cross interconnected principal piece；
5) it observes in cross interconnected principal piece, circulation peak value after the generation single-phase fault that 6 current transformers measure, if I2a1、I2c1、
I2b2、I2c2Abnormal increase and wherein I2c1、I2b2The circulation peak value that relatively other 2 current transformers measure is relatively small, then
Failure judgement is happened at cross interconnected minimal segment n sections of the cross interconnected principal piece；
6) it observes in cross interconnected principal piece, circulation peak value after the generation single-phase fault that 6 current transformers measure, if I2a1、I2c2
Abnormal to increase, then failure judgement is happened at cross interconnected minimal segment m sections of the cross interconnected principal piece.
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| CN201810764170.5A CN108646143A (en) | 2018-07-12 | 2018-07-12 | A kind of single-core power cables fault detect structure and its fault detection method based on circulation measurement |
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| CN201810764170.5A CN108646143A (en) | 2018-07-12 | 2018-07-12 | A kind of single-core power cables fault detect structure and its fault detection method based on circulation measurement |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298290A (en) * | 2018-12-04 | 2019-02-01 | 广东电网有限责任公司 | Failure judgment device, method and cable system |
| CN110609198A (en) * | 2019-09-11 | 2019-12-24 | 广东电网有限责任公司 | Operation and maintenance monitoring method for cable line and related equipment |
| CN112083264A (en) * | 2020-07-28 | 2020-12-15 | 河海大学 | Cable insulation fault on-line positioning method based on double-end electric quantity |
| CN112526287A (en) * | 2020-11-26 | 2021-03-19 | 四川电安智能科技有限公司 | Cable fault detection method based on cable grounding circulation |
| CN112526286A (en) * | 2020-11-26 | 2021-03-19 | 四川电安智能科技有限公司 | Cable grounding circulation fault detection method based on statistics |
| CN115189304A (en) * | 2022-08-10 | 2022-10-14 | 广东电网有限责任公司 | Cable grounding box |
| CN115469189A (en) * | 2022-10-10 | 2022-12-13 | 国网上海市电力公司 | Cable sheath fault judgment method based on sheath head-end current ratio and sheath circulation ratio |
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| CN101025429A (en) * | 2006-12-28 | 2007-08-29 | 上海电力学院 | Method and device for on-line monitoring power cable metal sheath layer insulating state |
| CN202886446U (en) * | 2012-07-12 | 2013-04-17 | 天津市津海天源电力技术有限公司 | Monitoring system for grounding current of high-voltage cable sheath |
| CN103698653A (en) * | 2013-12-30 | 2014-04-02 | 国家电网公司 | System and method for detecting earth fault of sheath of single-core power cable on basis of circulation measurement |
| CN106940413A (en) * | 2017-05-11 | 2017-07-11 | 国网江苏省电力公司苏州供电公司 | The short trouble section determination methods and device of high pressure long cable circuit |
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Patent Citations (4)
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| CN101025429A (en) * | 2006-12-28 | 2007-08-29 | 上海电力学院 | Method and device for on-line monitoring power cable metal sheath layer insulating state |
| CN202886446U (en) * | 2012-07-12 | 2013-04-17 | 天津市津海天源电力技术有限公司 | Monitoring system for grounding current of high-voltage cable sheath |
| CN103698653A (en) * | 2013-12-30 | 2014-04-02 | 国家电网公司 | System and method for detecting earth fault of sheath of single-core power cable on basis of circulation measurement |
| CN106940413A (en) * | 2017-05-11 | 2017-07-11 | 国网江苏省电力公司苏州供电公司 | The short trouble section determination methods and device of high pressure long cable circuit |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298290A (en) * | 2018-12-04 | 2019-02-01 | 广东电网有限责任公司 | Failure judgment device, method and cable system |
| CN110609198A (en) * | 2019-09-11 | 2019-12-24 | 广东电网有限责任公司 | Operation and maintenance monitoring method for cable line and related equipment |
| CN112083264A (en) * | 2020-07-28 | 2020-12-15 | 河海大学 | Cable insulation fault on-line positioning method based on double-end electric quantity |
| CN112083264B (en) * | 2020-07-28 | 2022-11-15 | 河海大学 | Cable insulation fault on-line positioning method based on double-end electric quantity |
| CN112526287A (en) * | 2020-11-26 | 2021-03-19 | 四川电安智能科技有限公司 | Cable fault detection method based on cable grounding circulation |
| CN112526286A (en) * | 2020-11-26 | 2021-03-19 | 四川电安智能科技有限公司 | Cable grounding circulation fault detection method based on statistics |
| CN112526287B (en) * | 2020-11-26 | 2024-03-26 | 四川电安智能科技有限公司 | Cable fault detection method based on cable grounding circulation |
| CN115189304A (en) * | 2022-08-10 | 2022-10-14 | 广东电网有限责任公司 | Cable grounding box |
| CN115469189A (en) * | 2022-10-10 | 2022-12-13 | 国网上海市电力公司 | Cable sheath fault judgment method based on sheath head-end current ratio and sheath circulation ratio |
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