CN106226650A - A kind of single-core power cables protective metal shell Fault Locating Method - Google Patents
A kind of single-core power cables protective metal shell Fault Locating Method Download PDFInfo
- Publication number
- CN106226650A CN106226650A CN201610522112.2A CN201610522112A CN106226650A CN 106226650 A CN106226650 A CN 106226650A CN 201610522112 A CN201610522112 A CN 201610522112A CN 106226650 A CN106226650 A CN 106226650A
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- Prior art keywords
- fault
- metal shell
- phase
- cable
- protective metal
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Classifications
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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 protective metal shell Fault Locating Method, it includes (1), when two ends or time earth fault occurs in the single-core cable phase protective metal shell under single loop parallel lay-up mode single-end earthed, disconnect this phase end earth lead switch, one D.C. voltmeter is connected in parallel in the protective metal shell of this phase head end and end, and a DC source and an ammeter are connected in series in the middle of this phase head end earth lead, now can form loop 1 and loop 2, (2) read voltage meter reading U and ammeter reading I, fault phase cable head is to the protective metal shell resistance R between trouble point1=U/I, the U that voltmeter records are fault phase cable head to the voltage of cable metal sheath between fault ground point, and the I that ammeter records is the electric current flowing through fault phase cable metal sheath；(3) fault phase cable head is calculated to distance L between trouble pointx。
Description
Technical field
The present invention relates to a kind of single-core power cables protective metal shell Fault Locating Method, belong to the detection technique of power equipment
Field.
Background technology
Along with the development of power industry, increasing high tension cable is used in the middle of electrical network, 110kV and above voltage
The power cable of grade is generally core, insulating barrier, protective metal shell, oversheath these four layers from inside to outside.
When high tension cable core is by alternating current, induced field can be produced around core, this induced field intensity
It is directly proportional to by the size of current of cable core.Operating high voltage power cable, due to eddy current effect, can protect at its metal
Put and induce induced voltage, the size of induced voltage not only with electric current (or short circuit current) and the length of cable flowing through core
Spend relevant with system of laying, also with arrangement mode, the distance dependent in loop around.
Cable jacket is typically made up of materials such as PVC and PE, it is easy to sustain damage in construction and transportation, and
And oversheath is likely in properly functioning period by the extraneous problem such as chemical attack and Coptotermes formosanus Shtrari. erosion.Once the sheath of cable goes out
Time existing damaged, protective metal shell it would appear that a little or multipoint earthing, owing to cable is generally the single-ended or side of two sides earth
Formula, so can be at cable grounding line, cable metal sheath and one loop of cable metal sheath fault point formation, and due to
The effect of load current electromagnetic induction can induce induced potential on protective metal shell, and once trouble point forms path, it will
Occurring bigger circulation in protective metal shell, this circulation not only can produce substantial amounts of heat, reduces the current-carrying capacity of cable, shortens cable
Life-span, and the moisture in air and soil may penetrate into cable major insulation by the protective metal shell of faulty component works as
In, the formation of water tree in XLPE cable can be accelerated.
Retrieval finds, studies more for power cable major insulation malfunction monitoring and localization method the most both at home and abroad, for
The method of protective metal shell fault location is less, as traveling wave method is only applicable to position power cable major insulation fault, and electric
Although bridge method and the voltage relative method method positioning protective metal shell fault that to be comparison traditional, but they were using
Cheng Zhong, does not consider contact resistance and the impact on measurement result of the test lead resistance, so all there is the highest the asking of precision
Topic.
Summary of the invention
Goal of the invention: the problem that the present invention is directed to the existence of above-mentioned prior art makes improvement, i.e. the invention discloses one
Single-core power cables protective metal shell Fault Locating Method, can solve traditional method and be led by contact resistance and test lead resistance
Cause the problem that certainty of measurement is the highest.
Technical scheme: a kind of single-core power cables protective metal shell Fault Locating Method, comprises the following steps:
(1), when two ends or single-end earthed the single-core cable phase protective metal shell under single loop parallel lay-up mode occur
During earth fault, disconnect this phase end earth lead switch, a D.C. voltmeter is connected in parallel to this phase head end and the metal of end
In sheath, and it is connected in series to, in the middle of this phase head end earth lead, now to form loop 1 He by a DC source and an ammeter
Loop 2, loop 1 is the path formed by voltmeter and fault phase, and loop 2 is by fault phase head end earth lead, DC source, electricity
The path that stream table, faulty section cable, protective metal shell earth point and the earth are formed,
(2) read voltage meter reading U and ammeter reading I, the protective metal shell between fault phase cable head to trouble point
Resistance R1=U/I, the U that voltmeter records are fault phase cable head to the voltage of cable metal sheath between fault ground point,
The I that ammeter records is the electric current flowing through fault phase cable metal sheath；
(3) fault phase cable head is calculated to distance L between trouble pointx, its calculation expression is:
Lx=R1/R0, wherein:
R1For the protective metal shell resistance between fault phase cable head to trouble point,
R0Resistance for cable metal sheath unit length.
Further, the DC source in step (1) is the DC generator that rated voltage cannot be below 30kV.
Further, the voltmeter in step (1) is microvolt step voltage table.
Beneficial effect: a kind of single-core power cables protective metal shell Fault Locating Method disclosed by the invention has following useful
Effect:
1, mode of connection is more directly perceived, simply,
2, it is easy to execute-in-place；
3, precision is high, and the XLPE cable certainty of measurement for the 110kV that protective metal shell resistance is 0.05 Ω/km can reach
1m。
Accompanying drawing explanation
Fig. 1 is the cable under test exemplary plot under primary Ioops parallel lay-up mode；
Fig. 2 is the wiring schematic diagram of a kind of single-core power cables protective metal shell Fault Locating Method disclosed by the invention；
Fig. 3 is the equivalent circuit diagram of Fig. 2.
Detailed description of the invention:
Below the detailed description of the invention of the present invention is described in detail.
A kind of single-core power cables protective metal shell Fault Locating Method, comprises the following steps:
(1), when two ends or single-end earthed the single-core cable phase protective metal shell under single loop parallel lay-up mode occur
During earth fault, disconnect this phase end earth lead switch, a D.C. voltmeter is connected in parallel to this phase head end and the metal of end
In sheath, and it is connected in series to, in the middle of this phase head end earth lead, now to form loop 1 He by a DC source and an ammeter
Loop 2, loop 1 is the path formed by voltmeter and fault phase, and loop 2 is by fault phase head end earth lead, DC source, electricity
The path that stream table, faulty section cable, protective metal shell earth point and the earth are formed,
With reference to Fig. 1, having the primary Ioops single-core cable of parallel lay-up to include A phase, B phase and C phase, A phase is by switch K1, switch
K4Carry out ground connection；B phase is by switch K2, switch K5Carry out ground connection；C phase is by switch K3, switch K6Carry out ground connection；Time properly functioning
Switch is closure state,
With reference to Fig. 2, it is assumed that earth fault occurs, now by the switch K of fault phase A head and end at A phase cable f point1、K4
Disconnect, and a D.C. voltmeter is connected to the head and end of A phase cable metal sheath, then from head end to fault phase cable
Protective metal shell injects DC current, and connects into a DC ammeter, line end and D.C. voltmeter phase at direct current source
Even, cable run total length be L (m), f point be fault ground point, Lx (m) is the fault phase cable head distance to trouble point, R1
Resistance for fault phase cable head to trouble point；
(2) read voltage meter reading U and ammeter reading I, the protective metal shell between fault phase cable head to trouble point
Resistance R1=U/I, the U that voltmeter records are fault phase cable head to the voltage of cable metal sheath between fault ground point,
The I that ammeter records is the electric current flowing through fault phase cable metal sheath；
(3) fault phase cable head is calculated to distance L between trouble pointx, its calculation expression is:
Lx=R1/R0, wherein:
R1For the protective metal shell resistance between fault phase cable head to trouble point,
R0Resistance for cable metal sheath unit length.
With reference to Fig. 3, owing to amperemeter inner resistance ideally is similar to infinitely great state, so the loop electricity in loop 2
Resistance is the loop resistance being far longer than loop 1, therefore the approach of current flowing is loop 1, it is clear that now voltmeter is measured
Voltage U on being, is also the resistive voltage of protective metal shell between fault phase cable head and trouble point, and what ammeter was measured is
For flowing through R1Electric current I, so protective metal shell resistance R between fault phase cable head and trouble point1=U/I.
Need to illustrate 2 points:
First of all for environmental disturbances possible during minimizing on-the-spot test and raising certainty of measurement, it is proposed that toward fault phase cable gold
Belong to the DC current injected in sheath and be no less than 30mA, usually require that rated voltage cannot be below the DC generator conduct of 30kV
DC source；
Secondly the precision of voltmeter should be microvolt level (μ V).
The method can reach 1m for the XLPE cable certainty of measurement of the 110kV that protective metal shell resistance is 0.05 Ω/km.
Further, the DC source in step (1) is the DC generator that rated voltage cannot be below 30kV.
Above embodiments of the present invention are elaborated.But the present invention is not limited to above-mentioned embodiment,
In the ken that art those of ordinary skill is possessed, it is also possible to do on the premise of without departing from present inventive concept
Go out various change.
Claims (3)
1. a single-core power cables protective metal shell Fault Locating Method, it is characterised in that comprise the following steps:
(1), when two ends or single-end earthed the single-core cable phase protective metal shell under single loop parallel lay-up mode ground connection occurs
During fault, disconnect this phase end earth lead switch, a D.C. voltmeter is connected in parallel to this phase head end and the protective metal shell of end
In, and be connected in series to, in the middle of this phase head end earth lead, now to form loop 1 and loop by a DC source and an ammeter
2, loop 1 is the path formed by voltmeter and fault phase, and loop 2 is by fault phase head end earth lead, DC source, electric current
The path that table, faulty section cable, protective metal shell earth point and the earth are formed,
(2) read voltage meter reading U and ammeter reading I, the protective metal shell resistance R between fault phase cable head to trouble point1
=U/I, the U that voltmeter records are fault phase cable head to the voltage of cable metal sheath, ammeter between fault ground point
The I recorded is the electric current flowing through fault phase cable metal sheath；
(3) fault phase cable head is calculated to distance L between trouble pointx, its calculation expression is:
Lx=R1/R0, wherein:
R1For the protective metal shell resistance between fault phase cable head to trouble point,
R0Resistance for cable metal sheath unit length.
A kind of single-core power cables protective metal shell Fault Locating Method the most according to claim 1, it is characterised in that step
(1) DC source in is the DC generator that rated voltage cannot be below 30kV.
A kind of single-core power cables protective metal shell Fault Locating Method the most according to claim 1, it is characterised in that step
(1) voltmeter in is microvolt step voltage table.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610522112.2A CN106226650A (en) | 2016-07-05 | 2016-07-05 | A kind of single-core power cables protective metal shell Fault Locating Method |
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| CN201610522112.2A CN106226650A (en) | 2016-07-05 | 2016-07-05 | A kind of single-core power cables protective metal shell Fault Locating Method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107015116A (en) * | 2017-04-19 | 2017-08-04 | 山东科汇电力自动化股份有限公司 | The high-tension cable sheath fault localization system and method for anti-the earth stray electrical current interference |
| CN107037310A (en) * | 2017-05-27 | 2017-08-11 | 重庆渝丰鑫新线缆科技有限公司 | The cable and its detecting system and detection method of breaking point detection can be carried out |
| CN107390088A (en) * | 2017-07-17 | 2017-11-24 | 武汉亿天科技有限公司 | A kind of high-tension cable oversheath malfunction detector and application method |
| CN107422227A (en) * | 2017-06-19 | 2017-12-01 | 南京康尼电子科技有限公司 | A kind of failure detector and method in Train door safety interlock loop |
| CN108445342A (en) * | 2018-03-01 | 2018-08-24 | 华南理工大学 | A kind of cable cover(ing) single-point metallicity fault ground induced current calculating method |
| CN108445341A (en) * | 2018-03-01 | 2018-08-24 | 华南理工大学 | The computational methods of each section of Leakage Current under a kind of cable cover(ing) multipoint earthing |
| CN108519537A (en) * | 2018-03-01 | 2018-09-11 | 华南理工大学 | Leak electricity greatly flow calculation methodologies under a kind of cable metal sheath multipoint earthing |
| CN108761166A (en) * | 2018-03-01 | 2018-11-06 | 华南理工大学 | A kind of induced current calculating method of the cable metal sheath N points ground connection based on matrix analysis |
| CN109428502A (en) * | 2017-08-22 | 2019-03-05 | 许继集团有限公司 | A kind of electricity getting device and method of cable sheath earthed system |
| CN113030649A (en) * | 2021-03-29 | 2021-06-25 | 国网上海市电力公司 | Intelligent cable fault automatic positioning method |
| CN114550993A (en) * | 2022-02-28 | 2022-05-27 | 国网江苏省电力有限公司无锡供电分公司 | Method and system for directly grounding two ends of single-phase sheath of high-voltage power cable |
| CN115356512A (en) * | 2022-08-18 | 2022-11-18 | 深圳市锦锐科技股份有限公司 | Integrated single-chip microcomputer chip abnormity analysis system |
| CN116299050A (en) * | 2023-05-17 | 2023-06-23 | 广东电网有限责任公司汕尾供电局 | Method, system, equipment and storage medium for detecting faults of protective layer |
| CN116718875A (en) * | 2023-08-10 | 2023-09-08 | 国网江苏省电力有限公司电力科学研究院 | Positioning method and instrument for sheath layer grounding in high-voltage cable single-end grounding system |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107015116A (en) * | 2017-04-19 | 2017-08-04 | 山东科汇电力自动化股份有限公司 | The high-tension cable sheath fault localization system and method for anti-the earth stray electrical current interference |
| CN107037310A (en) * | 2017-05-27 | 2017-08-11 | 重庆渝丰鑫新线缆科技有限公司 | The cable and its detecting system and detection method of breaking point detection can be carried out |
| CN107422227A (en) * | 2017-06-19 | 2017-12-01 | 南京康尼电子科技有限公司 | A kind of failure detector and method in Train door safety interlock loop |
| CN107422227B (en) * | 2017-06-19 | 2020-02-18 | 南京康尼电子科技有限公司 | Fault detection device and method for train door safety interlocking loop |
| CN107390088A (en) * | 2017-07-17 | 2017-11-24 | 武汉亿天科技有限公司 | A kind of high-tension cable oversheath malfunction detector and application method |
| CN109428502A (en) * | 2017-08-22 | 2019-03-05 | 许继集团有限公司 | A kind of electricity getting device and method of cable sheath earthed system |
| CN109428502B (en) * | 2017-08-22 | 2020-11-17 | 许继集团有限公司 | Power taking device and method for cable sheath grounding system |
| CN108761166B (en) * | 2018-03-01 | 2019-10-18 | 华南理工大学 | A kind of induced current calculating method of the cable metal sheath N point ground connection based on matrix analysis |
| CN108761166A (en) * | 2018-03-01 | 2018-11-06 | 华南理工大学 | A kind of induced current calculating method of the cable metal sheath N points ground connection based on matrix analysis |
| CN108519537B (en) * | 2018-03-01 | 2019-10-18 | 华南理工大学 | Leak electricity greatly flow calculation methodologies under a kind of cable metal sheath multipoint earthing |
| CN108519537A (en) * | 2018-03-01 | 2018-09-11 | 华南理工大学 | Leak electricity greatly flow calculation methodologies under a kind of cable metal sheath multipoint earthing |
| CN108445341A (en) * | 2018-03-01 | 2018-08-24 | 华南理工大学 | The computational methods of each section of Leakage Current under a kind of cable cover(ing) multipoint earthing |
| CN108445342A (en) * | 2018-03-01 | 2018-08-24 | 华南理工大学 | A kind of cable cover(ing) single-point metallicity fault ground induced current calculating method |
| CN113030649A (en) * | 2021-03-29 | 2021-06-25 | 国网上海市电力公司 | Intelligent cable fault automatic positioning method |
| CN114550993A (en) * | 2022-02-28 | 2022-05-27 | 国网江苏省电力有限公司无锡供电分公司 | Method and system for directly grounding two ends of single-phase sheath of high-voltage power cable |
| CN115356512A (en) * | 2022-08-18 | 2022-11-18 | 深圳市锦锐科技股份有限公司 | Integrated single-chip microcomputer chip abnormity analysis system |
| CN116299050A (en) * | 2023-05-17 | 2023-06-23 | 广东电网有限责任公司汕尾供电局 | Method, system, equipment and storage medium for detecting faults of protective layer |
| CN116299050B (en) * | 2023-05-17 | 2023-08-11 | 广东电网有限责任公司汕尾供电局 | Method, system, equipment and storage medium for detecting faults of protective layer |
| CN116718875A (en) * | 2023-08-10 | 2023-09-08 | 国网江苏省电力有限公司电力科学研究院 | Positioning method and instrument for sheath layer grounding in high-voltage cable single-end grounding system |
| CN116718875B (en) * | 2023-08-10 | 2023-12-15 | 国网江苏省电力有限公司电力科学研究院 | Positioning method and instrument for sheath layer grounding in high-voltage cable single-end grounding system |
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