CN108152662A - A kind of cross interconnected box fault diagnosis method and system based on earth current - Google Patents
A kind of cross interconnected box fault diagnosis method and system based on earth current Download PDFInfo
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- CN108152662A CN108152662A CN201711194012.2A CN201711194012A CN108152662A CN 108152662 A CN108152662 A CN 108152662A CN 201711194012 A CN201711194012 A CN 201711194012A CN 108152662 A CN108152662 A CN 108152662A
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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
- G01R31/088—Aspects of digital computing
Abstract
The present invention is intended to provide a kind of cross interconnected box fault diagnosis method and system based on earth current, to solve the problems, such as that the Cable fault examination in prior art is of high cost.In order to realize the purpose, a kind of cross interconnected box fault diagnosis method based on earth current of the present invention, including：Obtain the test earth current of each split-phases of current cross interconnected case first and last end ABC；Obtain the reference ground electric current of cross interconnected case head end and end each split-phases of ABC when cross interconnected case is normal；Failure phase is determined with reference ground electric current according to test earth current.The invention also discloses corresponding systems.Following advantageous effects can be obtained by implementing the present invention：The test earth current of each split-phases of cross interconnected case first and last end ABC need to only be obtained, you can it is at low cost according to test earth current failure judgement phase, and the operating modes such as ground resistance are can effectively avoid on diagnostic accuracy influence, while avoid whole circuit.
Description
Technical field
The present invention relates to power cable fault diagnosis and field of locating technology, and in particular to a kind of friendship based on earth current
Fork interconnection box fault diagnosis method and system.
Background technology
With the quickening of Chinese Urbanization pace of construction, electric load demand is sharply increased, urban aerial track remodelling
More and more with underground power grid power cable laying circuit, cable run becomes increasingly longer, to effectively reduce sheath circular layer electricity
Stream, long cable circuit is using cross connection grounding system at present.
Cross interconnected case easily meets with nature in circuit or human factor leads to failure, and such as, cross interconnected case internal wiring is wrong
Accidentally, coaxial cable fracture, intake in case etc., after such failure occurs, it is cross interconnected big section entire in circuit equivalent circuit occur
Change, cause to flow to the earth earth current appearance exception through protective metal shell, as taken measures not in time, serious thing may be caused
Therefore.For example, a 110kV cable metal jacket of certain power supply station administration, has occurred failure after putting into operation 2 years, checks cable immediately
Circuit finds at cable Main Corridor road 520m that cross interconnected case sheath protector breakdown is burnt, and fault point punctures and surrounding is tight
Reheating is burnt.
The existing method to whole cable detection expends a large amount of cost, and signal acquisition is filled based on traveling wave method fault localization
Put that requirement is high, signal processing difficulty is big, and the multiple points of method sectionalization test based on sheath electric current, equipment expend still compared with
It is more.
This patent is analyzed for the specific cross interconnected case of wired foil sheath, probes into and difference occurs in cross interconnected case
Earth current wave character during failure proposes a set of cross interconnected box fault diagnosis method and system based on earth current, this
Method and system, which can effectively avoid the operating modes such as ground resistance, influences diagnostic accuracy, while avoids whole circuit, it is only necessary to it is first,
Circulation earth current is tested on the cross interconnected case ground wire of end.
Invention content
The present invention is intended to provide a kind of cross interconnected box fault diagnosis method and system based on earth current, existing to solve
There is the problem of Cable fault examination in technical solution is of high cost.
In order to realize the purpose, a kind of cross interconnected box fault diagnosis method based on earth current of the present invention, including：
Obtain the test earth current of each split-phases of current cross interconnected case first and last end ABC；
Obtain the reference ground electric current of cross interconnected case head end and end each split-phases of ABC when cross interconnected case is normal；
Failure phase is determined with reference ground electric current according to test earth current.
Preferably, it is described to determine that failure mutually includes with reference ground electric current according to test earth current：It judges whether
Cross interconnected wiring error failure；If there is no cross interconnected wiring error failure, then head end in discriminating test earth current
Unequal with end and with reference ground electric current comparison result is more than that phase of given threshold is failure phase.
Preferably, it is described to determine that failure mutually includes with reference ground electric current according to test earth current：According to the test
Earth current obtains the degree of unbalancedness of each split-phase, and each split-phase test earth current and load are obtained according to the test earth current
The ratio of electric current；When there are ratio be more than it is preset than threshold value and degree of unbalancedness be more than preset degree of balance threshold value, then judge to send out
Raw failure.
Preferably, when judgement is broken down, when the i split-phases of cross interconnected case meet equation below, judge the i split-phases
Earth fault occurs：
(Ii2＞ Ii1∩Ii2＞ Ii2N)∪(Ii1＞ Ii2∩Ii1＞ Ii1N), i ∈ { A, B, C }
Wherein,
IA1Represent the test earth current of current cross interconnected case head end A split-phases；
IB1Represent the test earth current of current cross interconnected case head end B split-phases；
IC1Represent the test earth current of current cross interconnected case head end C split-phases；
IA2Represent the test earth current of current cross interconnected case end A split-phases；
IB2Represent the test earth current of current cross interconnected case end B split-phases；
IC2Represent the test earth current of current cross interconnected case end C split-phases；
IA1NRepresent the reference ground electric current of cross interconnected case head end A split-phases when cross interconnected case is normal；
IB1NRepresent the reference ground electric current of cross interconnected case head end B split-phases when cross interconnected case is normal；
IC1NRepresent the reference ground electric current of cross interconnected case head end C split-phases when cross interconnected case is normal；
IA2NRepresent the reference ground electric current of cross interconnected case end A split-phases when cross interconnected case is normal；
IB2NRepresent the reference ground electric current of cross interconnected case end B split-phases when cross interconnected case is normal；
IC2NRepresent the reference ground electric current of cross interconnected case end C split-phases when cross interconnected case is normal.
Preferably, the abort situation that failure phase is obtained by tester includes：By tester in cross interconnected case
Head end or end send distance measuring signal to the other end, and abort situation is determined according to distance measuring signal.
As another aspect of the present invention, a kind of cross interconnected box fault diagnosis system based on earth current, including：
Test earth current acquisition module：Obtain the test earth current of each split-phases of current cross interconnected case first and last end ABC；
Reference ground electric current acquisition module：It is each to obtain cross interconnected case head end and the end ABC when cross interconnected case is normal
The reference ground electric current of split-phase；
Failure phase determining module：Failure phase is determined with reference ground electric current according to test earth current.
Preferably, it is described to determine that failure mutually includes with reference ground electric current according to test earth current：It judges whether
Cross interconnected wiring error failure；If there is no cross interconnected wiring error failure, then head end in discriminating test earth current
Unequal with end and with reference ground electric current comparison result is more than that phase of given threshold is failure phase.
Preferably, it is described to determine that failure mutually includes with reference ground electric current according to test earth current：According to the test
Earth current obtains the degree of unbalancedness of each split-phase, and each split-phase test earth current and load are obtained according to the test earth current
The ratio of electric current；When there are ratio be more than it is preset than threshold value and degree of unbalancedness be more than preset degree of balance threshold value, then judge to send out
Raw failure.
Preferably, when judgement is broken down, when the i split-phases of cross interconnected case meet equation below, judge the i split-phases
Earth fault occurs：
(Ii2＞ Ii1∩Ii2＞ Ii2N)∪(Ii1＞ Ii2∩Ii1＞ Ii1N), i ∈ { A, B, C }
Wherein,
IA1Represent the test earth current of current cross interconnected case head end A split-phases；
IB1Represent the test earth current of current cross interconnected case head end B split-phases；
IC1Represent the test earth current of current cross interconnected case head end C split-phases；
IA2Represent the test earth current of current cross interconnected case end A split-phases；
IB2Represent the test earth current of current cross interconnected case end B split-phases；
IC2Represent the test earth current of current cross interconnected case end C split-phases；
IA1NRepresent the reference ground electric current of cross interconnected case head end A split-phases when cross interconnected case is normal；
IB1NRepresent the reference ground electric current of cross interconnected case head end B split-phases when cross interconnected case is normal；
IC1NRepresent the reference ground electric current of cross interconnected case head end C split-phases when cross interconnected case is normal；
IA2NRepresent the reference ground electric current of cross interconnected case end A split-phases when cross interconnected case is normal；
IB2NRepresent the reference ground electric current of cross interconnected case end B split-phases when cross interconnected case is normal；
IC2NRepresent the reference ground electric current of cross interconnected case end C split-phases when cross interconnected case is normal.
Preferably, the abort situation that failure phase is obtained by tester includes：By tester in cross interconnected case
Head end or end send distance measuring signal to the other end, and abort situation is determined according to distance measuring signal.
Following advantageous effects can be obtained by implementing the present invention：The present invention only need to obtain cross interconnected case first and last end
The test earth current of each split-phases of ABC, you can it is at low cost according to test earth current failure judgement phase, and can effectively avoid and connect
The operating modes such as ground resistance influence diagnostic accuracy, while avoid whole circuit.
Description of the drawings
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is the system connection figure of the present invention；
Fig. 3 is the cross interconnected cables simulation model of principal piece；
Fig. 4 calculates equivalent circuit for sheath faradimeter.
Specific embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further with reference to specific embodiment
It is bright：
Embodiment 1：
The present invention provides a kind of cross interconnected box fault diagnosis method based on earth current, as shown in Figure 1, including：
Step S1：Obtain the test earth current of each split-phases of current cross interconnected case first and last end ABC；
Step S2:Obtain the reference ground of cross interconnected case head end and end each split-phases of ABC when cross interconnected case is normal
Electric current；
Step S3：Failure phase is determined with reference ground electric current according to test earth current.
The present invention need to only obtain the test earth current of each split-phases of cross interconnected case first and last end ABC, you can be connect according to test
Earth-current failure judgement phase, can effectively avoid the operating modes such as ground resistance influences diagnostic accuracy, while avoid whole circuit.
The principle of the present invention is further explained below：
For high-tension cable, protective metal shell uses continuous cross connection grounding mode, i.e. cable connector both sides by sheath
By cross connection grounding.During single-core cable horizontal linear parallel lay-up, it is assumed that a, principal piece cross interconnected according to ABC-BCA
Cross interconnected cables simulation model is as shown in Figure 3.Heavy line is cable fibre core in Fig. 3, and fine line is shielded layer and ground wire.Figure
Cross interconnected cable shown in 3 shares 9 sections, its equivalent admittance of the first section of A, B, C phase is respectively YA1, YB1, YC1；A, in B, C phase
Section, equivalent admittance is respectively YA2、YB2、YC2；A, the latter end of B, C phase, equivalent admittance are respectively YA3、YB3、YC3。IA1、IB1、IC1Point
Not Wei cable head A, B, C three-phase ground connection line current.IA2、IB2、IC2The respectively A of cable end piece, B, the ground connection of C three-phases
Line current.
In cable operational process, core wire and metal screen layer may be considered transformer primary side winding and secondary around
Group, the load current of core wire generate the magnetic field of alternation, necessarily have the part magnetic line of force to be mutually crosslinked with metal screen layer, in shielded layer
Induced electromotive force is generated, the factors such as this electromotive force and cable parameter itself, core wire electric current are related.Sheath faradimeter calculation etc.
It is as shown in Figure 4 to be worth circuit.
If cable length is l, then loop-voltage equation group such as formula in Fig. 4
In formula 1, Es1、Es2、Es3The induced potential of unit length respectively on three-phase protective metal shell；R1、R2For cable metal
The ground resistance at sheath both ends；ReRepresent ground resistance；R is the resistance of cable metal sheath；X11、X22、X33For cable metal sheath
From induction reactance；X12、X13、X21、X23、X31、X32Mutual induction reactance between protective metal shell.1 expression A phases in the present invention in subscript；2
Represent B phases, 3 represent C phases；Such as X12Represent the mutual induction reactance between A phases protective metal shell and B phase protective metal shells.
Enable RA=R+R1+R2+Re, RB=R1+R2+Re, with Is1r、Is2r、Is3rThe faradic real part of sheath is represented, with Is1f、
Is2f、Is3fThe faradic imaginary part of sheath is represented, with Us1r、Us2r、Us3rThe real part of sheath voltage is represented, with Us1f、Us2f、Us3fTable
Show the imaginary part of sheath voltage, obtain calculating the faradic matrix equation of cable sheath.
Cable metal sheath earth current is made of three parts is
IGND=Ig+Ic+Is (3)
Wherein：IgFor Leakage Current；IcFor capacitance current；IsTo sense electric current.
Wherein, the capacitance current I of every meter of length cablesc=2 π fUC, wherein, U is the voltage-to-ground of cable, and f is power supply frequency
Rate, C are the capacitance of every meter of length cables.
According to formula (1)-formula (3), the contact resistance of sheath sensing size of current and cable parameter itself, shielded layer and the earth
R, the factors such as working voltage U are related.It is assumed that cable working voltage, cable section length remain unchanged, then capacitance current is kept not
Become.It is destroyed once external force occurs for cable, after the situation for generating one-point or multi-point ground connection, by monitoring the electricity of the ground connection on protective metal shell
Flow IGNDVariation can find the situation of cable fault in time.Cross interconnected wiring error in construction or operation and maintenance, then will be in gold
Belong to the earth current that sheath circuit will generate bigger.By measuring earth current value, cross interconnected wiring error is excluded first.
As a kind of above-mentioned preferred embodiment of the cross interconnected box fault diagnosis method based on earth current：Described
Determine that failure mutually includes with reference ground electric current according to test earth current：Judge whether cross interconnected wiring error failure；
If there is no cross interconnected wiring error failure, then head end is unequal with end in discriminating test earth current and is connect with benchmark
That phase that the comparison result of earth-current is more than given threshold is failure phase.Given threshold can be test earth current and benchmark
The comparison threshold value that earth current is divided by, is arranged as required to, such as 1.2,1, and wherein given threshold can be test ground connection electricity
The difference of stream and reference ground electric current, given threshold are to be calculated increasing or subtracting in cable working voltage according to formula (1)~(3)
Few 10% and cable section length increase or when reducing 10%, sheath senses the maximum value of electric current size variation.
As a kind of above-mentioned preferred embodiment of the cross interconnected box fault diagnosis method based on earth current：Described
Determine that failure mutually includes with reference ground electric current according to test earth current：Each split-phase is obtained not according to the test earth current
The degree of balance obtains the ratio of each split-phase test earth current and load current according to the test earth current；When there are ratios
More than it is preset than threshold value and degree of unbalancedness be more than preset degree of balance threshold value, then judgement is broken down.Than threshold value and the degree of balance
Threshold value can be arranged as required to, and such as be set as 0.5 than threshold value, degree of balance threshold value is set as 1.
When pitching generation different faults in mutual header, the earth current of cross interconnected case head end and end fault phase occurs significantly
Variation, for the electric insulating quality failure including various single-phase, two-phase ground connection, broken string or short trouble, when cable external insulation is sent out
During raw earth fault, a certain phase earth current value of same measurement point is far longer than other two-phases, and the split-phase of this phase
Significant change occurs, then can be concluded that this excessive phase external insulation of earth current deviation breaks down.Cross interconnected case system
When normal, the reference ground electric current of first and end is IA1N、IB1N、IC1N、IA2N、IB2N、IC2N；The test earth current of first and end is
IA1、IB1、IC1、IA2、IB2、IC2, calculate the degree of unbalancedness per phase, i.e. IA1/IA2、IB1/IB2、IC1/IC2, meanwhile, using often connecting
Earth-current and load current ILRatio, i.e. IA1/IL、IA2/IL、IB1/IL、IB2/IL、IC1/IL、IC2/ILIf some ratio surpasses
It crosses 0.5 and significant change occurs, if uneven angle value is more than 1 and significant change occurs, failure has occurred in cable.
As a kind of above-mentioned preferred embodiment of the cross interconnected box fault diagnosis method based on earth current：Work as judgement
When breaking down, when the i split-phases of cross interconnected case meet formula (4), judge that earth fault occurs for the i split-phases：
(Ii2＞ Ii1∩Ii2＞ Ii2N)∪(Ii1＞ Ii2∩Ii1＞ Ii1N), i ∈ { A, B, C } (4)
Wherein,
IA1Represent the test earth current of current cross interconnected case head end A split-phases；
IB1Represent the test earth current of current cross interconnected case head end B split-phases；
IC1Represent the test earth current of current cross interconnected case head end C split-phases；
IA2Represent the test earth current of current cross interconnected case end A split-phases；
IB2Represent the test earth current of current cross interconnected case end B split-phases；
IC2Represent the test earth current of current cross interconnected case end C split-phases；
IA1NRepresent the reference ground electric current of cross interconnected case head end A split-phases when cross interconnected case is normal；
IB1NRepresent the reference ground electric current of cross interconnected case head end B split-phases when cross interconnected case is normal；
IC1NRepresent the reference ground electric current of cross interconnected case head end C split-phases when cross interconnected case is normal；
IA2NRepresent the reference ground electric current of cross interconnected case end A split-phases when cross interconnected case is normal；
IB2NRepresent the reference ground electric current of cross interconnected case end B split-phases when cross interconnected case is normal；
IC2NRepresent the reference ground electric current of cross interconnected case end C split-phases when cross interconnected case is normal.
As a kind of above-mentioned preferred embodiment of the cross interconnected box fault diagnosis method based on earth current：It is described logical
The abort situation for crossing tester acquisition failure phase includes：It is sent by tester in cross interconnected case head end or end to the other end
Distance measuring signal determines abort situation according to distance measuring signal.
Embodiment 2：
A kind of cross interconnected box fault diagnosis system based on earth current, as shown in Fig. 2, including：
Test earth current acquisition module：Obtain the test earth current of each split-phases of current cross interconnected case first and last end ABC；
Reference ground electric current acquisition module：It is each to obtain cross interconnected case head end and the end ABC when cross interconnected case is normal
The reference ground electric current of split-phase；
Failure phase determining module：Failure phase is determined with reference ground electric current according to test earth current.
As a kind of above-mentioned preferred embodiment of the cross interconnected box fault diagnosis system based on earth current：Described
Determine that failure mutually includes with reference ground electric current according to test earth current：Judge whether cross interconnected wiring error failure；
If there is no cross interconnected wiring error failure, then head end is unequal with end in discriminating test earth current and is connect with benchmark
That phase that the comparison result of earth-current is more than given threshold is failure phase.
As a kind of above-mentioned preferred embodiment of the cross interconnected box fault diagnosis system based on earth current：Described
Determine that failure mutually includes with reference ground electric current according to test earth current：Each split-phase is obtained not according to the test earth current
The degree of balance obtains the ratio of each split-phase test earth current and load current according to the test earth current；When there are ratios
More than it is preset than threshold value and degree of unbalancedness be more than preset degree of balance threshold value, then judgement is broken down.
As a kind of above-mentioned preferred embodiment of the cross interconnected box fault diagnosis system based on earth current：Work as judgement
When breaking down, when the i split-phases of cross interconnected case meet formula (4), judge that earth fault occurs for the i split-phases：
(Ii2＞ Ii1∩Ii2＞ Ii2N)∪(Ii1＞ Ii2∩Ii1＞ Ii1N), i ∈ { A, B, C } (4)
Wherein,
IA1Represent the test earth current of current cross interconnected case head end A split-phases；
IB1Represent the test earth current of current cross interconnected case head end B split-phases；
IC1Represent the test earth current of current cross interconnected case head end C split-phases；
IA2Represent the test earth current of current cross interconnected case end A split-phases；
IB2Represent the test earth current of current cross interconnected case end B split-phases；
IC2Represent the test earth current of current cross interconnected case end C split-phases；
IA1NRepresent the reference ground electric current of cross interconnected case head end A split-phases when cross interconnected case is normal；
IB1NRepresent the reference ground electric current of cross interconnected case head end B split-phases when cross interconnected case is normal；
IC1NRepresent the reference ground electric current of cross interconnected case head end C split-phases when cross interconnected case is normal；
IA2NRepresent the reference ground electric current of cross interconnected case end A split-phases when cross interconnected case is normal；
IB2NRepresent the reference ground electric current of cross interconnected case end B split-phases when cross interconnected case is normal；
IC2NRepresent the reference ground electric current of cross interconnected case end C split-phases when cross interconnected case is normal.
As a kind of above-mentioned preferred embodiment of the cross interconnected box fault diagnosis system based on earth current：It is described logical
The abort situation for crossing tester acquisition failure phase includes：It is sent by tester in cross interconnected case head end or end to the other end
Distance measuring signal determines abort situation according to distance measuring signal.
Technical characteristic the foregoing is merely specific embodiments of the present invention, but the present invention is not limited thereto, Ren Heben
The technical staff in field in the field of the invention, all cover among the scope of the claims of the present invention by the variation or modification made.
Claims (10)
- A kind of 1. cross interconnected box fault diagnosis method based on earth current, which is characterized in that including：Obtain the test earth current of each split-phases of current cross interconnected case first and last end ABC；Obtain the reference ground electric current of cross interconnected case head end and end each split-phases of ABC when cross interconnected case is normal；Failure phase is determined with reference ground electric current according to test earth current.
- A kind of 2. cross interconnected box fault diagnosis method based on earth current as described in claim 1, which is characterized in that institute It states and determines that failure mutually includes with reference ground electric current according to test earth current：Judge whether cross interconnected wiring error event Barrier；If there is no cross interconnected wiring error failure, then head end is unequal with end and and base in discriminating test earth current That phase that the comparison result of quasi- earth current is more than given threshold is failure phase.
- A kind of 3. cross interconnected box fault diagnosis method based on earth current as described in claim 1, which is characterized in that institute It states and determines that failure mutually includes with reference ground electric current according to test earth current：Each split-phase is obtained according to the test earth current Degree of unbalancedness, the ratio of each split-phase test earth current and load current is obtained according to the test earth current；Work as presence Ratio be more than it is preset than threshold value and degree of unbalancedness be more than preset degree of balance threshold value, then judgement is broken down.
- 4. a kind of cross interconnected box fault diagnosis method based on earth current as claimed in claim 3, which is characterized in that when When judgement is broken down, when the i split-phases of cross interconnected case meet equation below, judge that earth fault occurs for the i split-phases：(Ii2＞ Ii1∩Ii2＞ Ii2N)∪(Ii1＞ Ii2∩Ii1＞ Ii1N), i ∈ { A, B, C }Wherein,IA1Represent the test earth current of current cross interconnected case head end A split-phases；IB1Represent the test earth current of current cross interconnected case head end B split-phases；IC1Represent the test earth current of current cross interconnected case head end C split-phases；IA2Represent the test earth current of current cross interconnected case end A split-phases；IB2Represent the test earth current of current cross interconnected case end B split-phases；IC2Represent the test earth current of current cross interconnected case end C split-phases；IA1NRepresent the reference ground electric current of cross interconnected case head end A split-phases when cross interconnected case is normal；IB1NRepresent the reference ground electric current of cross interconnected case head end B split-phases when cross interconnected case is normal；IC1NRepresent the reference ground electric current of cross interconnected case head end C split-phases when cross interconnected case is normal；IA2NRepresent the reference ground electric current of cross interconnected case end A split-phases when cross interconnected case is normal；IB2NRepresent the reference ground electric current of cross interconnected case end B split-phases when cross interconnected case is normal；IC2NRepresent the reference ground electric current of cross interconnected case end C split-phases when cross interconnected case is normal.
- A kind of 5. cross interconnected box fault diagnosis method based on earth current as described in claim 1, which is characterized in that institute It states and is included by the abort situation of tester acquisition failure phase：By tester in cross interconnected case head end or end to the other end Distance measuring signal is sent, abort situation is determined according to distance measuring signal.
- 6. a kind of cross interconnected box fault diagnosis system based on earth current, which is characterized in that including：Test earth current acquisition module：Obtain the test earth current of each split-phases of current cross interconnected case first and last end ABC；Reference ground electric current acquisition module：Obtain cross interconnected case head end and end each split-phases of ABC when cross interconnected case is normal Reference ground electric current；Failure phase determining module：Failure phase is determined with reference ground electric current according to test earth current.
- A kind of 7. cross interconnected box fault diagnosis system based on earth current as claimed in claim 6, which is characterized in that institute It states and determines that failure mutually includes with reference ground electric current according to test earth current：Judge whether cross interconnected wiring error event Barrier；If there is no cross interconnected wiring error failure, then head end is unequal with end and and base in discriminating test earth current That phase that the comparison result of quasi- earth current is more than given threshold is failure phase.
- A kind of 8. cross interconnected box fault diagnosis system based on earth current as claimed in claim 6, which is characterized in that institute It states and determines that failure mutually includes with reference ground electric current according to test earth current：Each split-phase is obtained according to the test earth current Degree of unbalancedness, the ratio of each split-phase test earth current and load current is obtained according to the test earth current；Work as presence Ratio be more than it is preset than threshold value and degree of unbalancedness be more than preset degree of balance threshold value, then judgement is broken down.
- 9. a kind of cross interconnected box fault diagnosis system based on earth current as claimed in claim 8, which is characterized in that when When judgement is broken down, when the i split-phases of cross interconnected case meet equation below, judge that earth fault occurs for the i split-phases：(Ii2＞ Ii1∩Ii2＞ Ii2N)∪(Ii1＞ Ii2∩Ii1＞ Ii1N), i ∈ { A, B, C }Wherein,IA1Represent the test earth current of current cross interconnected case head end A split-phases；IB1Represent the test earth current of current cross interconnected case head end B split-phases；IC1Represent the test earth current of current cross interconnected case head end C split-phases；IA2Represent the test earth current of current cross interconnected case end A split-phases；IB2Represent the test earth current of current cross interconnected case end B split-phases；IC2Represent the test earth current of current cross interconnected case end C split-phases；IA1NRepresent the reference ground electric current of cross interconnected case head end A split-phases when cross interconnected case is normal；IB1NRepresent the reference ground electric current of cross interconnected case head end B split-phases when cross interconnected case is normal；IC1NRepresent the reference ground electric current of cross interconnected case head end C split-phases when cross interconnected case is normal；IA2NRepresent the reference ground electric current of cross interconnected case end A split-phases when cross interconnected case is normal；IB2NRepresent the reference ground electric current of cross interconnected case end B split-phases when cross interconnected case is normal；IC2NRepresent the reference ground electric current of cross interconnected case end C split-phases when cross interconnected case is normal.
- 10. a kind of cross interconnected box fault diagnosis system based on earth current as claimed in claim 6, which is characterized in that The abort situation that failure phase is obtained by tester includes：By tester in cross interconnected case head end or end to another End sends distance measuring signal, and abort situation is determined according to distance measuring signal.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| 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 |
| CN110031696A (en) * | 2019-03-06 | 2019-07-19 | 国家电网有限公司 | A kind of 330kV XLPE cable metal sheath Type Equivalent Circuit Model |
| WO2021012639A1 (en) * | 2019-07-22 | 2021-01-28 | 国网湖北省电力有限公司电力科学研究院 | Insulation diagnosis and positioning method for insulated tube-type bus bar |
| CN111983381A (en) * | 2020-08-10 | 2020-11-24 | 国网江苏省电力有限公司电力科学研究院 | Power cable line cross interconnection box fault positioning method and device |
| CN113917372A (en) * | 2021-10-18 | 2022-01-11 | 国网江苏省电力有限公司无锡供电分公司 | Method and device for checking cross-connection system in non-unpacking and charged mode |
| CN113917372B (en) * | 2021-10-18 | 2023-09-15 | 国网江苏省电力有限公司无锡供电分公司 | Method and device for checking cross interconnection system without unpacking |
| WO2023077888A1 (en) * | 2021-11-02 | 2023-05-11 | 国网江苏省电力有限公司电力科学研究院 | Device and method for detecting defects of high-voltage cable transposition ground system |
| CN115656719A (en) * | 2022-10-26 | 2023-01-31 | 徐忠林 | High-voltage cable sheath defect online diagnosis method based on sheath current abnormal motion |
| CN115656719B (en) * | 2022-10-26 | 2023-04-07 | 徐忠林 | High-voltage cable sheath defect online diagnosis method based on sheath current transaction |
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