CN106990327A - High voltage single-core cable short trouble point detecting method - Google Patents
High voltage single-core cable short trouble point detecting method Download PDFInfo
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- CN106990327A CN106990327A CN201710328267.7A CN201710328267A CN106990327A CN 106990327 A CN106990327 A CN 106990327A CN 201710328267 A CN201710328267 A CN 201710328267A CN 106990327 A CN106990327 A CN 106990327A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The present invention relates to a kind of high voltage single-core cable short trouble point detecting method, the particular location of trouble point in the cable of short trouble occurs for determination, high voltage single-core cable short trouble point detecting method is：N sampled point is taken in the cable, assume that each sampled point occurs short trouble and emulated respectively, the phase difference of the circulating current at cable two ends when short trouble betides each sampled point is calculated respectively, and be fitted according to each phase difference calculated, obtain the corresponding relational expression for occurring the position of failure point and phase difference of short trouble of cable；When short trouble occurs in cable, the particular location for the trouble point for determining to occur short trouble is solved according to the position of failure point and the relational expression of phase difference that occur short trouble.The present invention can quickly and accurately determine the particular location that short trouble occurs in one section of cable, it is possible to achieve more accurate positioning, it is possible to realize that on-line monitoring, failure can find out trouble point in time after occurring.
Description
Technical field
It is used to determine that the specific of short trouble occurs in one section of cable in cross interconnected section of cable the present invention relates to a kind of
The high voltage single-core cable short trouble point detecting method of position.
Background technology
Current cable fault station-keeping mode mainly has two kinds：One is the protection ranging using distance protection equipment, and two are
Utilize the traveling wave method fault location pattern of electronic sensor.1) principle of distance relay recognized based on parameter uses post-fault system
The parameter of change constitutes Protection criteria, and power cable line characteristics of distributed parameters substantially, comprising multiple complete cross interconnected
Section, line channel environment are complicated, and this will significantly affect the performance of Distance Protection Algorithm.Due to measurement impedance and fault distance
No longer proportional relation, the protection domain of traditional distance protection algorithm will reduce.In actual applications, using line impedance away from
Line impedance is also there is from protection and calculates inaccurate, the incomplete situation of line length information, thus can not be determined in cable
Occurs the particular location of short trouble.2) traveling wave method is by detecting the transient state travelling wave on faulty line between bus and trouble point
Propagation time carry out fault localization, because the spread speed of transient state travelling wave is close to the light velocity, the fault location mould based on traveling wave method
There is noise and eliminate the problem of being extracted with the wave head moment in formula, in addition, multiple cross interconnected sections are made with complicated line channel environment
Wave velocity disunity, wave impedance into long cable circuit is discontinuous, and this kind of method is dfficult to apply in actual long cable circuit
Carry out the precise positioning of abort situation.
The patent of invention of Application No. 201611128521.0《The short trouble of the cross interconnected structure of high voltage single-core cable is determined
Position method and device》In disclose a kind of direction based on current signal come the method positioned to short trouble, work as the party
Method is only capable of which section cable that short trouble is betided in the cross interconnected structure of cable judged, and specific former in the cable
Barrier point can not but be determined.
The content of the invention
It is an object of the invention to provide a kind of particular location that can quickly and accurately determine that short trouble occurs in cable
High voltage single-core cable short trouble point detecting method.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
Trouble point in a kind of high voltage single-core cable short trouble point detecting method, the cable for determining generation short trouble
Particular location, the high voltage single-core cable short trouble point detecting method is：N sampled point is taken in the cable, respectively
Assuming that each described sampled point occurs short trouble and emulated, short trouble is calculated respectively and betides each sampled point
The phase difference of the circulating current at Shi Suoshu cables two ends, and be fitted according to each phase difference calculated, obtain the cable
The corresponding relational expression for occurring the position of failure point and phase difference of short trouble；When short trouble occurs in the cable, root
Determination, which is solved, according to the position of failure point of the generation short trouble and the relational expression of phase difference occurs the trouble point of short trouble
Particular location.
It is preferred that, using one end of the cable as origin, characterized and sent out with the distance between the trouble point and described origin
The position of the trouble point of raw short trouble.
It is preferred that, the trouble point and the distance between the origin are linear with the phase difference.
It is preferred that, using one end of the close power supply of the cable as the origin.
It is preferred that, equidistantly to choose the sampled point on the cable.
Because above-mentioned technical proposal is used, the present invention has following advantages compared with prior art：The present invention can quickly,
Accurately determine the particular location that short trouble occurs in one section of cable, it is possible to achieve more accurate positioning, it is possible to realize
Line is monitored, and failure can find out trouble point in time after occurring.
Brief description of the drawings
Fig. 1 is the schematic diagram of simple power system.
Fig. 2 flows to schematic diagram for fault current in cross interconnected section of high voltage single-core cable.
Fig. 3 for cross interconnected section of medium and high voltage cable metal sheath of high voltage single-core cable induced voltage and circulating current etc.
Imitate circuit diagram.
Embodiment
The invention will be further described for shown embodiment below in conjunction with the accompanying drawings.
Embodiment one：Accompanying drawing 1 show a kind of power system for putting list, and it has power supply --- transmission line --- load group
Into wherein transmission line portions use high-tension cable.Transmission line is using cross interconnected section of a complete cable, the electricity in the Fig. 1
Cross interconnected section of cable is connected between the first grounding box G1 and the second grounding box G2, and it includes three-phase line, respectively A phase lines
Road, B phase lines and C phase lines.Include 3 section single-core cables of the number consecutively from 1 to 3 per phase line, then three in A phase lines
Section single-core cable is respectively A1, A2, A3；Three sections of single-core cables in B phase lines are respectively B1, B2, B3；Three in C phase lines
Section single-core cable is respectively C1, C2, C3.The core of each section of single-core cable included in per phase line, which is directly sequentially connected, to be connect,
So as to constitute each phase line.Every section of single-core cable is respectively provided with two ends, respectively front-end and back-end.The respective 1st in three-phase line
Section single-core cable, i.e. A1, B1, C1 metal sheath front end are connected with the first grounding box G1 respectively, and the 1st, 2 in A phase lines
Section single-core cable A1, A2 metal sheath rear end by cross interconnected case J1, J2 respectively with the 2nd in B phase lines, 3 sections of single electricity
Cable B2, B3 metal sheath front end are connected, in B phase lines the 1st, 2 sections of single-core cable B1, B2 metal sheath rear end passes through
Cross interconnected case J1, J2 respectively with the 2nd in C phase lines, 3 sections of single-core cables C2, C3 metal sheath front end be connected, C phase lines
In road the 1st, 2 sections of single-core cable C1, C2 metal sheath rear end by cross interconnected case J1, J2 respectively with A phase lines
2nd, 3 sections of single-core cables A2, A3 metal sheath front end are connected.Respective 3rd section of single-core cable A3, B3, C3 in three-phase line
Metal sheath rear end be connected respectively with the second grounding box G2." front end " mentioned here refers to close in each section of single-core cable
First grounding box G1 one end, i.e. one end close to power supply, and close to the second grounding box G2 one end, i.e. one end close to load
Referred to as " rear end ".
When short trouble occurs in cross interconnected section of above-mentioned cable, short trouble can be determined using following methods
In which section single-core cable：In the front end of A1, B1, C1 metal sheath, current transformer I is set respectively1a、I1b、I1c, then
The rear end of the metal sheath of each section of single-core cable sets current transformer, respectively I respectively2a、I2b、I2c、I3a、I3b、I3c、I4a、
I4b、I4c.When fault-free occurs, influenceed by cross interconnected, the electric current that the metal sheath of each section of single-core cable is sensed by core has
Line.When cable run breakdown fault occurs in any one section of single-core cable, its core forms short circuit, core electric current to metal sheath
The earth is flowed into directly by metal sheath and from the earth point at its two ends, causes faulty section single-core cable and cross interconnected section of list
The metal sheath electric current rise of core cable, circulating current size is close to fault current.Simultaneously as electromagnetic coupling effect, failure
The circuit that circuit closes on can also sense one larger electric current of generation.It is as shown in Figure 2, false by taking A1-B2-C3 interconnecting sections as an example
If failure occurs in B2 sections of single-core cable, then fault current is flowed out from trouble point along metal sheath to B2 two ends, in B2 front ends,
Electric current is through cross interconnected case J1, current transformer I2aEnter ground after the metal sheath for flowing into A1, in B2 rear ends, electric current is through Current Mutual Inductance
Device I3b, cross interconnected case J2 enter ground after flowing into C3 metal sheath.Then flow through two Current Mutual Inductances at B2 sections of two ends of single-core cable
Device I2aAnd I3bIn the sense of current it is opposite.And for non-faulting section, such as C3, two current transformer I at its two ends3bAnd I4cIn
The sense of current it is identical.But for the single-core cable A1 of first paragraph, due to the current transformer I of its front end1aSet location
It result in its current reference direction in opposite direction with the current reference in other current transformers, therefore A1 sections of two ends of single-core cable
Two current transformer I1aAnd I2bIn the sense of current it is identical.Based on features above, firstly for respective in three-phase line
1st section of single-core cable A1, B1, C1, define the reverse signal for the current signal that the front end of its metal sheath is directly detected for should
The 1st section of respective sheath front end electric current of single-core cable A1, B1, C1；For the respective 1st in three-phase line, 2 sections of single-core cables
A1, B1, C1, A2, B2, C2, define the electric current that the rear end of its metal sheath directly detects be the 1st, the shield of 2 sections of single-core cables
The sheath front end electric current of layer back end current and the coupled the 2nd, 3 sections of single-core cables；For the in three-phase line the respective 3rd
Section single-core cable A3, B3, C3, define the shield of electric current that the rear end of its metal sheath directly detects for the 3rd section of single-core cable
Layer back end current.I.e. in the construction shown in fig. 1, the current signal I that A1 metal sheath front end is directly detected1aReverse letter
Number the sheath front end electric current for being A1, the current signal I that B1 metal sheath front end is directly detected1bReverse signal be B1 shield
Layer front end electric current, the current signal I that C1 metal sheath front end is directly detected1cReverse signal for C1 sheath front end electricity
Stream；I2aSheath back end current and B2 sheath front end electric current simultaneously for A1, I3bIt is B2 sheath back end current and C3 simultaneously
Sheath front end electric current, I2bSheath back end current and C2 sheath front end electric current simultaneously for B1, I3cIt is simultaneously C2 sheath rear end
The sheath front end electric current of electric current and A3, I2cSheath back end current and A2 sheath front end electric current simultaneously for C1, I3aIt is simultaneously A2
Sheath back end current and B3 sheath front end electric current；I4aFor A3 sheath back end current, I4bFor B3 sheath back end current,
I4cFor C3 sheath back end current.Then according to the sheath back end current and sheath front end electric current of each section of single-core cable whether direction
Mutually judge whether occur short trouble in each section of single-core cable on the contrary；If the sheath back end current and sheath of either segment single-core cable
The front end sense of current in this section of single-core cable on the contrary, then occur short trouble.Typically directly the respective 1st in detection three-phase line
The current signal of the metal sheath front end of section single-core cable, and the operating frequency phase of the current signal directly detected is anti-phase and obtain
To the operating frequency phase of the sheath front end electric current of the 1st section of single-core cable；Respective 1st, 2 sections of singles directly in detection three-phase line
The current signal of the metal sheath rear end of cable, and using the operating frequency phase of the current signal directly detected as the 1st, 2 sections
The sheath front end electric current of the operating frequency phase of the sheath back end current of single-core cable and the coupled the 2nd, 3 sections of single-core cables
Operating frequency phase；The current signal of the metal sheath rear end of respective 3rd section of single-core cable directly in detection three-phase line, and will be straight
The operating frequency phase for connecing the current signal detected is used as the operating frequency phase of the sheath back end current of the 3rd section of single-core cable.More than
During, do Fast Fourier Transform (FFT) to the current signal respectively directly detected and arrive its operating frequency phase.The sense of current is opposite
Embodied by phase, therefore, according to the operating frequency phase of the sheath back end current of each section of single-core cable and its sheath front end electric current
The difference of operating frequency phase be that can determine whether whether the sheath back end current and sheath front end electric current of each section of single-core cable in opposite direction.When
When the sense of current is opposite, the phase difference of current signal is 180 ° or so.Current signal I operating frequency phase is represented with B (I) below
(unit is angle), P (section) represents operating frequency phase and its sheath front end of the sheath back end current of correspondence section single-core cable
The difference (section ∈ [" A1 ", " B1 ", " C1 ", " A2 ", " B2 ", " C2 ", " A3 ", " B3 ", " C3 "]) of the operating frequency phase of electric current,
Then：
P (A1)=B (I2a)-[B(I1a)+180]
P (B1)=B (I2b)-[B(I1b)+180]
P (C1)=B (I2c)-[B(I1c)+180]
P (A2)=B (I3a)-B(I2c)
P (B2)=B (I3b)-B(I2a) (1)
P (C2)=B (I3c)-B(I2b)
P (A3)=B (I4a)-B(I3c)
P (B3)=B (I4b)-B(I3a)
P (C3)=B (I4c)-B(I3b)
If the operating frequency phase of the operating frequency phase of the sheath back end current of either segment single-core cable and its sheath front end electric current it
When poor P (section) is within the phase allowed band centered on ± 180 °, then the sheath rear end of this section of single-core cable is judged
Electric current and the sheath front end sense of current are opposite.Because the cable run in one cross interconnected section is usually no more than 500m, failure
When two ends circulating current signal phase difference will not because trouble point apart from two ends length it is unequal have marked difference, and failure
The phase difference of section and non-faulting section is then larger, therefore is that can leave larger nargin, such as phase formulating fault section criterion
Position allowed band is (120 °, 240 °) ∪ (- 240 °, -120 °), when phase difference is in above range, then it is assumed that there occurs short
Road failure.And the phase difference at the single-core cable end two ends of non-faulting is very small, within ± 30 °, therefore the above method is used
To judge the cut cable where short trouble.
Determine short trouble occur position where cut cable after, also need to further determine that trouble point in this section of cable
Particular location.Still by taking above-mentioned A1-B2-C3 interconnecting sections as an example, the induced voltage of its high-tension cable metal sheath and circulating current
Schematic equivalent circuit is as shown in figure 3, wherein circulating current Im1For：
In the case of trouble-free, circulating current Im1Sometimes a few peace even more than ten peaces can be reached, induced voltage is simultaneously little,
But sheath impedance very little.And Zma1、Zmb2And Zmc3All it is perceptual.And grounding resistance RgIt is purely resistive.Therefore, it is grounded
Resistance RgSize can influence the property of impedance.If grounding resistance RgIt is smaller, Zma1、Zmb2And Zmc3Perceptual weight it is larger, sense
Answer influence of the voltage to circulating current larger, therefore the influence that perceptual weight is embodied in phase difference is larger.If grounding resistance
RgIt is larger, Zma1、Zmb2And Zmc3Perceptual weight it is smaller, resistive component is larger on the whole for sheath impedance path, therefore perceptual weight
The influence being embodied in phase difference is smaller.Grounding resistance under normal operation is usually no more than 0.5 Ω, under 0.5 Ω.
It is a kind of to be used for the high voltage single-core cable short circuit event of the particular location of trouble point in the cable of determination generation short trouble
Hinder point detecting method, be：For each section of cable, n sampled point is taken in the cable first, it is assumed that each sampled point occurs
Short trouble is simultaneously emulated, and the phase of the circulating current at cable two ends when short trouble betides each sampled point is calculated respectively
Difference, and be fitted according to each phase difference calculated, obtain the position of failure point and phase of the corresponding generation short trouble of cable
The relational expression of potential difference.When short trouble occurs in cable, according to the position of failure point for occurring short trouble and the pass of phase difference
It is the particular location that formula solves the trouble point for determining to occur short trouble.
In above-mentioned high voltage single-core cable short trouble point detecting method, generally with one end of cable (close to the one of power supply
End) it is origin, the position for the trouble point for occurring short trouble is characterized with the distance between trouble point and origin l.Choosing sampling
During point, equidistantly to choose sampled point on cable.Sampled point need to be chosen respectively to every section of cable in advance and calculate, be fitted.From
And show that trouble point and the distance between origin are linear with phase difference.
For example, the present invention has carried out simulation calculation for a 110kV cable run, the circuit three-phase direct-burried level is applied
If, cable model YJLW03, three-phase balancing load, every section of cable 500m, total track length 1500m.Opened by first section cable head end
Begin, take a sampled point every 50m and once emulated as trouble point, calculate the P values under the diverse location of trouble point, most
P values are fitted afterwards, the relation of position of failure point and P values can be obtained, shown in such as equation group formula (3).Wherein l represents failure
Distance (0 of the point apart from the cut cable power end (front end)<l<500).
P (A1, l)=- 0.02265l+143.8
P (B1, l)=- 0.02271l+143.8
P (C1, l)=- 0.02278l+143.9
P (A2, l)=- 0.05034l+184.8
P (B2, l)=- 0.04848l+176.6 (3)
P (C 2, l)=- 0.04581l+168.7
P (A3, l)=- 0.06439l+191.3
P (B3, l)=- 0.06434l+190.1
P (C3, l)=- 0.06444l+191.3
Then when actually occurring failure, trouble point can be calculated according to a relational expression in above-mentioned equation group formula (3)
With cable head end where it apart from l, so that it is determined that the position of trouble point.
The present invention carries out short trouble positioning using high voltage single-core cable circulating current.Intersected according to high voltage single-core cable mutual
Current direction feature under the characteristics of connection and short trouble, by the circulating current of Monitoring High Voltage Cable, extracts circulating current signal
Power frequency component amplitude and phase information, judge the flow direction of circulating current, it is first determined the fault section of high-tension cable.Then,
The phase difference of each cross interconnected section of two ends circulating current is relevant with grounding resistance, position of failure point and load current, according to connecing
The phase difference of ground resistance, load current and circulating current can more accurate failure judgement point position.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, should all be included within the scope of the present invention.
Claims (5)
1. trouble point in a kind of high voltage single-core cable short trouble point detecting method, the cable for determining generation short trouble
Particular location, it is characterised in that：The high voltage single-core cable short trouble point detecting method is：N are taken to adopt in the cable
Sampling point, it is assumed that each described sampled point occurs short trouble and emulated, calculates short trouble and betides each respectively
The phase difference of the circulating current at the cable two ends during sampled point, and be fitted according to each phase difference calculated, obtain
To the corresponding relational expression for occurring the position of failure point and phase difference of short trouble of the cable；It is short-circuit when occurring in the cable
During failure, solved according to the relational expression of the position of failure point of the generation short trouble and phase difference and determine occur short trouble
The particular location of trouble point.
2. high voltage single-core cable short trouble point detecting method according to claim 1, it is characterised in that：With the cable
One end be origin, the position for the trouble point for occurring short trouble is characterized with the distance between the trouble point and described origin.
3. high voltage single-core cable short trouble point detecting method according to claim 2, it is characterised in that：The trouble point
It is linear with the phase difference with the distance between the origin.
4. high voltage single-core cable short trouble point detecting method according to claim 2, it is characterised in that：With the cable
Close power supply one end be the origin.
5. the high voltage single-core cable short trouble point detecting method according to claim 1 or 2 or 3 or 4, it is characterised in that：
On the cables. equidistantly to choose the sampled point.
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| CN108646144A (en) * | 2018-07-25 | 2018-10-12 | 国家电网有限公司 | A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system |
| CN112881863A (en) * | 2021-01-18 | 2021-06-01 | 长沙理工大学 | High-voltage cable fault on-line monitoring method based on novel criterion established by sheath current |
| CN113030649A (en) * | 2021-03-29 | 2021-06-25 | 国网上海市电力公司 | Intelligent cable fault automatic positioning method |
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| CN112881863A (en) * | 2021-01-18 | 2021-06-01 | 长沙理工大学 | High-voltage cable fault on-line monitoring method based on novel criterion established by sheath current |
| CN113030649A (en) * | 2021-03-29 | 2021-06-25 | 国网上海市电力公司 | Intelligent cable fault automatic positioning method |
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| CN106990327B (en) | 2019-10-18 |
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