CN104833902B - Crane span structure cabling low resistance fault point positioning method - Google Patents
Crane span structure cabling low resistance fault point positioning method Download PDFInfo
- Publication number
- CN104833902B CN104833902B CN201510257545.5A CN201510257545A CN104833902B CN 104833902 B CN104833902 B CN 104833902B CN 201510257545 A CN201510257545 A CN 201510257545A CN 104833902 B CN104833902 B CN 104833902B
- Authority
- CN
- China
- Prior art keywords
- cable
- span structure
- crane span
- resistance
- failure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Locating Faults (AREA)
Abstract
The crane span structure cabling low resistance fault point positioning method of the present invention, including：A) judges the property of cable fault, there is low resistance failure, performs step b)；B) measures low resistance size；C) measures accurate resistance；D) coarse localization of Method of Cable Trouble Point, one end of indicating circuit is fixed on the crane span structure of front end, and the other end is moved on the crane span structure of rear end, and when light emitting diode has most bright state, position of the indicating circuit on the crane span structure of rear end is the trouble point of failure cable cored wire.The cable low resistance fault point positioning method of the present invention, step is simple, reasonable, it is easy to practical operation, the normal work of other cables on cable testing bridge is not influenceed during implementation, avoid conventional trouble point and look into the drawbacks of can not find and change the high cost that whole piece cable is brought, beneficial effect significantly, is easy to application.
Description
Technical field
The present invention relates to a kind of crane span structure cabling low resistance fault point positioning method, in particular, more particularly to one
Crane span structure cabling low resistance fault point positioning method kind using cable tear along the gradually pressure drop of crane span structure both sides.
Background technology
In industrial factory building, power cable is typically all concentrated using crane span structure and laid.Cable is applied metal crane span structure
If during, it is easy to damage the insulating barrier of cable.In the noise of industrial site, vibration and moisture vapor and corrosivity
Under the collective effect of gas, the cable that insulating barrier sustains damage easily occurs ultralow resistive between single-phase or two-phase and crane span structure
Failure.In the case where not influenceing other equipment normally to run, it is impossible to traditional action of low-voltage pulse and audio sound detection are utilized, to non-
The trouble point of armouring rubber and plastic low-voltage cable is accurately positioned.
Due to being laid with substantial amounts of cable on metal crane span structure, cable does not arrange close and many up and down only in horizontal direction
Layer is overlapped, if can not accurately be positioned to the trouble point for causing cable low resistance, is determined if only progress is rough
Position, then need to check the cable in very long scope, implement very cumbersome, time-consuming.Such as the service cable of our factory kiln tail blower fan
Wherein one relative cable testing bridge shakes that survey resistance is unqualified, and cable specification is 3*240+3*50mm2Copper core cable, length is about
150 meters, scene universal meter test failure resistance is 90 Ω, is judged as low-voltage cable fault property event ultralow with respect to crane span structure resistance
Barrier.Related data and consulting profession company are consulted, all has no idea to carry out localization of fault detection, Zhi Nenggeng using existing instrument
Cable is changed, cost is huge.
The content of the invention
Shortcoming of the invention in order to overcome above-mentioned technical problem is fixed there is provided a kind of crane span structure cabling low resistance trouble point
Position method.
The crane span structure cabling low resistance fault point positioning method of the present invention, it is particular in that, passes through following steps
To realize：A) judges the property of cable fault, by each cored wire in cable it is hanging after, using megger measure cable core it is relative
In the resistance of cable testing bridge, if high-impedance state, then show that the cable core insulating properties is good, in the absence of failure；If by
Survey cable core is low resistance, then shows that the cable core has low resistance failure, perform step b)；B) measurements low resistance is big
Small, the one end for selecting failure cable cored wire is measurement end, and the resistance between failure cable cored wire and cable testing bridge is measured with universal meter
It is worth size；C) measures accurate resistance, using low-voltage dc power supply by voltammetry measure failure cable cored wire and cable testing bridge it
Between accurate resistance, if the voltmeter of low-voltage dc power supply and the registration of ammeter are respectively U, I, then pass through formula (1) calculate
The resistance R being out of order between cable core and cable testing bridge:
D) coarse localization of Method of Cable Trouble Point, using the impulse method of electric cable failure detector, first tests cable fault
Two ends of instrument are connected between the cable core for insulating good and crane span structure, using reflection configuration, measure cable length；Then again in event
Hinder the measurement that multiple reflection shape is carried out on cored wire, by the contrast to waveform between the good cored wire of insulation and failure cored wire, obtain
Be out of order the rough position of cable core trouble point；E) Method of Cable Trouble Point is accurately positioned, by trouble point rough position front end
Yoke plate or connecting line between adjacent cable crane span structure are taken apart, so as to be insulated between the cable testing bridge before and after at this, title is taken apart before place
The cable testing bridge at two ends is respectively front end crane span structure, rear end crane span structure afterwards；Then two ends of low-voltage dc power supply are connected on failure cable
In measurement end and crane span structure, then by current-limiting resistance and light emitting diode by forming indicating circuit after cable series connection, indicating circuit
One end is fixed on the crane span structure of front end, and the other end is moved on the crane span structure of rear end, and the bright of light emitting diode is observed during movement
Degree, when light emitting diode has most bright state, position of the indicating circuit on the crane span structure of rear end is the failure of failure cable cored wire
Point, the cable of fault point is routed up, you can easily and accurately find out the abort situation of cable.
The crane span structure cabling low resistance fault point positioning method of the present invention, step c) is measuring the process of accurate resistance
In, the low-voltage dc power supply used by transformer, rectification circuit, insurance resistance, filter capacitor, slide rheostat, ammeter,
Voltmeter, switch K1 and switch K2 compositions, switch K1 are series on a side loop of transformer, and rectification circuit is connected to transformation
The secondary side of device；Insurance resistance, slide rheostat and ammeter series connection are followed by the output end in rectification circuit, filter capacitor and electricity
Two ends of pressure table are connected in two output ends of rectification circuit；The measurement of accurate resistance is realized by following steps：C-1) is surveyed
Amount connection, one of low-voltage dc power supply is exported the measurement end for being terminated at failure cable cored wire, and another output is terminated at electricity
On cable crane span structure；C-2) applies voltage, and then closure switch K2 first is closed again switch K1, so as to which low-voltage dc voltage is applied
Between failure cable cored wire and cable testing bridge；C-3) obtains electric current and magnitude of voltage, and K2 is disconnected again after voltmeter has instruction,
And the resistance in slide rheostat access circuit is adjusted, so that the registration of voltmeter, ammeter is within reasonable range of readings, read
Take registration U, the registration I of ammeter of voltmeter.
The resistance R ' of current-limiting resistance passes through in the crane span structure cabling low resistance fault point positioning method of the present invention, step e)
Formula (2) is asked for：
Wherein, U is the registration for applying voltage, i.e. voltmeter；UDFor the rated operational voltage of light emitting diode, IDIt is luminous
Operating current of the diode under rated voltage.
The beneficial effects of the invention are as follows：The cable low resistance fault point positioning method of the present invention, passes through megger and ten thousand first
The cable core that there is low resistance failure is judged with table, recycles low-voltage dc power supply to measure failure cable cored wire and cable
Accurate resistance between crane span structure；Then by comparing the pulse of normal cable core and the pulse of failure cable cored wire, event is obtained
Hinder the rough position of point, the crane span structure of Method of Cable Trouble Point front end is disconnected, the finally pressure drop using failure cable breakage along crane span structure
The characteristics of gradually increasing, during mobile indicating circuit, by the brightness for judging light emitting diode, you can obtain exactly
At the failure of cable.
The cable low resistance fault point positioning method of the present invention, step is simple, reasonable, is easy to practical operation, in implementation
During do not influence the normal work of other cables on cable testing bridge, it is to avoid conventional trouble point, which is looked into, can not find and change whole piece electricity
The drawbacks of high cost that cable is brought, beneficial effect significantly, is easy to application.
Brief description of the drawings
Fig. 1 is the schematic diagram in the present invention using the accurate resistance measurement of low-voltage dc power supply progress；
Fig. 2 is the schematic diagram that is measured using electric cable failure detector in the present invention；
Fig. 3 is the schematic diagram in the present invention using reflection configuration acquisition failure cable rough position；
Fig. 4 is the schematic diagram in the present invention using indicating circuit acquisition trouble point elaborate position.
Embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
The crane span structure cabling low resistance fault point positioning method of the present invention, is realized by following steps：
A) judges the property of cable fault, by each cored wire in cable it is hanging after, using megger measure cable core it is relative
In the resistance of cable testing bridge, if high-impedance state, then show that the cable core insulating properties is good, in the absence of failure；If by
Survey cable core is low resistance, then shows that the cable core has low resistance failure, perform step b)；
B) measures low resistance size, and the one end for selecting failure cable cored wire is measurement end, and failure cable is measured with universal meter
Resistance size between cored wire and cable testing bridge；
C) measures accurate resistance, and failure cable cored wire and cable testing bridge are measured by voltammetry using low-voltage dc power supply
Between accurate resistance, if the voltmeter of low-voltage dc power supply and the registration of ammeter are respectively U, I, then pass through formula (1) count
Calculate the resistance R between failure cable cored wire and cable testing bridge:
As shown in figure 1, giving the schematic diagram that accurate resistance measurement is carried out using low-voltage dc power supply, shown low-pressure direct
Flow power supply by transformer, rectification circuit, insurance resistance, filter capacitor, slide rheostat, ammeter, voltmeter, switch K1 and
K2 compositions are switched, switch K1 is series on a side loop of transformer, and rectification circuit is connected to the secondary side of transformer；Insurance electricity
Resistance, slide rheostat and ammeter series connection are followed by output end in rectification circuit, and two ends of filter capacitor and voltmeter are connected to whole
In two output ends of current circuit.
The measurement of accurate resistance is realized by following steps：
C-1) measurements connection, one of low-voltage dc power supply is exported the measurement end for being terminated at failure cable cored wire, another
Individual output is terminated on cable testing bridge；
C-2) applies voltage, and then closure switch K2 first is closed again switch K1, so as to which low-voltage dc voltage is applied
Between failure cable cored wire and cable testing bridge；
C-3) obtains electric current and magnitude of voltage, disconnects K2 again after voltmeter has instruction, and adjust slide rheostat access electricity
Resistance in road, so that the registration of voltmeter, ammeter is within reasonable range of readings, reads registration U, the ammeter of voltmeter
Registration I.
D) coarse localization of Method of Cable Trouble Point, using the impulse method of electric cable failure detector, first tests cable fault
Two ends of instrument are connected between the cable core for insulating good and crane span structure, using reflection configuration, measure cable length；Then again in event
Hinder the measurement that multiple reflection shape is carried out on cored wire, by the contrast to waveform between the good cored wire of insulation and failure cored wire, obtain
Be out of order the rough position of cable core trouble point；
As shown in Fig. 2 giving the schematic diagram measured in the present invention using electric cable failure detector, Fig. 3 gives
The schematic diagram of failure cable rough position is obtained using reflection configuration, passes through the reflection configuration to the good cored wire that insulate and failure electricity
The contrast of core reflection configuration, can draw the Position Approximate of failure cable cored wire trouble point.
E) Method of Cable Trouble Point is accurately positioned, by the yoke plate between the adjacent cable crane span structure of trouble point rough position front end
Or connecting line is taken apart, so as to be insulated between cable testing bridge before and after at this, the cable testing bridge for claiming the place of taking apart rear and front end is respectively
Front end crane span structure, rear end crane span structure；Then two ends of low-voltage dc power supply are connected on failure cable measurement end and crane span structure, then by current limliting
Resistance is fixed on the crane span structure of front end with light emitting diode by forming indicating circuit, one end of indicating circuit after cable series connection, separately
One end is moved on the crane span structure of rear end, and the brightness of light emitting diode is observed during movement, and light emitting diode has most bright shape
During state, position of the indicating circuit on the crane span structure of rear end is the trouble point of failure cable cored wire, and the cable of fault point is routed up,
The abort situation of cable can easily and accurately be found out.
As shown in figure 4, giving the schematic diagram for obtaining trouble point elaborate position in the present invention using indicating circuit, the step
In, the resistance R ' of current-limiting resistance is asked for by formula (2)：
Wherein, U is the registration for applying voltage, i.e. voltmeter；UDFor the rated operational voltage of light emitting diode, IDIt is luminous
Operating current of the diode under rated voltage.
Claims (3)
1. a kind of crane span structure cabling low resistance fault point positioning method, it is characterised in that realized by following steps：
A) judges the property of cable fault, by each cored wire in cable it is hanging after, using megger measure cable core relative to electricity
The resistance of cable crane span structure, if high-impedance state, then shows that the cable core insulating properties is good, in the absence of failure；If tested electricity
Core is low resistance, then shows that the cable core has low resistance failure, perform step b)；
B) measures low resistance size, and the one end for selecting failure cable cored wire is measurement end, and failure cable cored wire is measured with universal meter
Resistance size between cable testing bridge；
C) measures accurate resistance, is measured using low-voltage dc power supply by voltammetry between failure cable cored wire and cable testing bridge
Accurate resistance, if the voltmeter of low-voltage dc power supply and the registration of ammeter are respectively U, I, then calculated by formula (1)
Resistance R between failure cable cored wire and cable testing bridge:
<mrow>
<mi>R</mi>
<mo>=</mo>
<mfrac>
<mi>U</mi>
<mi>I</mi>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mo>;</mo>
</mrow>
D) coarse localization of Method of Cable Trouble Point, using the impulse method of electric cable failure detector, first by electric cable failure detector
Two ends are connected between the cable core for insulating good and crane span structure, using reflection configuration, measure cable length；Then again in failure core
The measurement of multiple reflection shape is carried out on line, by the contrast to waveform between the good cored wire of insulation and failure cored wire, event is drawn
Hinder the rough position of cable core trouble point；
E) Method of Cable Trouble Point is accurately positioned, by the yoke plate between the adjacent cable crane span structure of trouble point rough position front end or company
Wiring is taken apart, so as to be insulated between the cable testing bridge before and after at this, claims the cable testing bridge respectively front end for taking place rear and front end apart
Crane span structure, rear end crane span structure；Then two ends of low-voltage dc power supply are connected on failure cable measurement end and crane span structure, then by current-limiting resistance
It is fixed on light emitting diode by forming indicating circuit, one end of indicating circuit after cable series connection on the crane span structure of front end, the other end
Moved on the crane span structure of rear end, the brightness of light emitting diode is observed during movement, when light emitting diode has most bright state,
Position of the indicating circuit on the crane span structure of rear end is the trouble point of failure cable cored wire, and the cable of fault point is routed up, you can
Easily and accurately find out the abort situation of cable.
2. crane span structure cabling low resistance fault point positioning method according to claim 1, it is characterised in that：Step c) exists
During measuring accurate resistance, the low-voltage dc power supply used by transformer, rectification circuit, insurance resistance, filter capacitor,
Slide rheostat, ammeter, voltmeter, switch K1 and switch K2 compositions, switch K1 are series at a side loop of transformer
On, rectification circuit is connected to the secondary side of transformer；Insurance resistance, slide rheostat and ammeter series connection are followed by rectification circuit
Two ends of output end, filter capacitor and voltmeter are connected in two output ends of rectification circuit；The measurement of accurate resistance by with
Lower step is realized：
C-1) measurements connection, one of low-voltage dc power supply is exported the measurement end for being terminated at failure cable cored wire, another is defeated
Go out to be terminated on cable testing bridge；
C-2) applies voltage, and then closure switch K2 first is closed again switch K1, so as to which low-voltage dc voltage is applied into event
Hinder between cable core and cable testing bridge；
C-3) obtains electric current and magnitude of voltage, disconnects K2 again after voltmeter has instruction, and adjust in slide rheostat access circuit
Resistance so that the registration of voltmeter, ammeter is within reasonable range of readings, reads the registration U of voltmeter, ammeter and show
Number I.
3. crane span structure cabling low resistance fault point positioning method according to claim 1 or 2, it is characterised in that：Step
E) the resistance R ' of current-limiting resistance is asked for by formula (2) in：
<mrow>
<msup>
<mi>R</mi>
<mo>&prime;</mo>
</msup>
<mo>=</mo>
<mfrac>
<mrow>
<mi>U</mi>
<mo>-</mo>
<msub>
<mi>U</mi>
<mi>D</mi>
</msub>
</mrow>
<msub>
<mi>I</mi>
<mi>D</mi>
</msub>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
1
Wherein, U is the registration for applying voltage, i.e. voltmeter；UDFor the rated operational voltage of light emitting diode, IDFor light-emitting diodes
Operating current of the pipe under rated voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510257545.5A CN104833902B (en) | 2015-05-19 | 2015-05-19 | Crane span structure cabling low resistance fault point positioning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510257545.5A CN104833902B (en) | 2015-05-19 | 2015-05-19 | Crane span structure cabling low resistance fault point positioning method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104833902A CN104833902A (en) | 2015-08-12 |
| CN104833902B true CN104833902B (en) | 2017-09-29 |
Family
ID=53811905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510257545.5A Active CN104833902B (en) | 2015-05-19 | 2015-05-19 | Crane span structure cabling low resistance fault point positioning method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104833902B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068721A (en) * | 2018-01-24 | 2019-07-30 | 中科院微电子研究所昆山分所 | A kind of test device of electric lockset electric current |
| CN109031042A (en) * | 2018-07-16 | 2018-12-18 | 国网重庆市电力公司电力科学研究院 | A kind of wire and cable quality detecting system |
| CN114578186B (en) * | 2022-02-28 | 2023-03-31 | 四川大学 | Cable early fault severity evaluation method based on volt-ampere characteristic analysis |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008191023A (en) * | 2007-02-06 | 2008-08-21 | Tokyo Electric Power Co Inc:The | Voltage cable fault detector |
| CN102207533A (en) * | 2011-04-12 | 2011-10-05 | 陕西化建工程有限责任公司 | Method for searching fault of power cable |
| CN102298104A (en) * | 2010-06-25 | 2011-12-28 | 上海宝钢工业检测公司 | Method for detecting ground fault of bridge cable |
| WO2012150232A1 (en) * | 2011-05-03 | 2012-11-08 | Alstom Technology Ltd | Device and method for detecting and locating a fault on a gas-insulated coaxial electrical cable |
-
2015
- 2015-05-19 CN CN201510257545.5A patent/CN104833902B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008191023A (en) * | 2007-02-06 | 2008-08-21 | Tokyo Electric Power Co Inc:The | Voltage cable fault detector |
| CN102298104A (en) * | 2010-06-25 | 2011-12-28 | 上海宝钢工业检测公司 | Method for detecting ground fault of bridge cable |
| CN102207533A (en) * | 2011-04-12 | 2011-10-05 | 陕西化建工程有限责任公司 | Method for searching fault of power cable |
| WO2012150232A1 (en) * | 2011-05-03 | 2012-11-08 | Alstom Technology Ltd | Device and method for detecting and locating a fault on a gas-insulated coaxial electrical cable |
Non-Patent Citations (3)
| Title |
|---|
| 6kV高压电缆接地诊断及处理;李校立 等;《华电技术》;20130831;第35卷(第8期);第28-30，第35页 * |
| 对于电缆接地故障定位方法的探讨;雷晓明 等;《科技创新导报》;20121231(第19期);第76-77页 * |
| 电缆故障分析与精确定点;孙晨 等;《黑龙江电力》;20081031;第30卷(第5期);第394-397，第400页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104833902A (en) | 2015-08-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102128988B (en) | Method of measuring earth ground resistance of a pylon using a single clamp | |
| CN202041602U (en) | Electric appliance circuit fault detection tool | |
| CN104833902B (en) | Crane span structure cabling low resistance fault point positioning method | |
| CN102298104B (en) | A kind of method for detecting ground fault of bridge cable | |
| JP2014169999A (en) | Ground resistance measurement device and method | |
| CN103630797B (en) | A kind of transformator turn-to-turn short circuit detection means | |
| CN107290629B (en) | 10KV low-voltage distribution network ground fault positioning method | |
| CN102128983A (en) | Method for measuring phase of power transmission and distribution line | |
| CN110058125A (en) | A kind of method for locating single-phase ground fault and system | |
| CN104007354B (en) | The total group test circuit and method of 10kV Zinc-Oxide Arresters and cable | |
| CN102360055A (en) | Paper insulation winding wire and paper covered transposed lead short circuit detection restoration method and device thereof | |
| US20150042355A1 (en) | Cable System and Test Cable Therefore | |
| CN108287292A (en) | The fast searching method of multicore cable trouble location | |
| CN107561368A (en) | A kind of measuring system and measuring method of large scale electrical power unit wideband impedance operator | |
| CN107271775B (en) | electric power overhead line phase detection method | |
| CN102385024A (en) | Equipment and method for detecting ground point of machine winding | |
| KR101551341B1 (en) | Apparatus for checking of cable | |
| CN103954889A (en) | Capacitive type device insulation parameter electrification testing method based on pincerlike current sensors | |
| US20130119976A1 (en) | High voltage detection in power system electrical high voltage line | |
| CN208672742U (en) | The device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination | |
| CN203433045U (en) | Ground resistance test device | |
| KR101336860B1 (en) | Detecting apparatus for fault location of power line | |
| CN109085407B (en) | Method for measuring electromagnetic influence of overhead transmission line on buried metal pipeline | |
| CN103245842B (en) | 10 ~ 35kV new clothes electric device total system dry run detection method | |
| CN105259474A (en) | Online fault range finding method of T-connection cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |