CN104833902A - Bridge laying cable low-resistance fault point positioning method - Google Patents

Bridge laying cable low-resistance fault point positioning method Download PDF

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Publication number
CN104833902A
CN104833902A CN201510257545.5A CN201510257545A CN104833902A CN 104833902 A CN104833902 A CN 104833902A CN 201510257545 A CN201510257545 A CN 201510257545A CN 104833902 A CN104833902 A CN 104833902A
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cable
voltage
resistance
low
crane span
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CN201510257545.5A
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CN104833902B (en
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安济怀
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YUXING CHEMICAL CO Ltd JINAN
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YUXING CHEMICAL CO Ltd JINAN
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Abstract

The invention relates to a bridge laying cable low-resistance fault point positioning method, which comprises the steps of a), judging the nature of a cable fault, and executing a step b if a low-resistance fault exists; b), measuring the size of low resistance; c), measuring accurate resistance; and d), roughly positioning a cable fault point, wherein one end of an indicating circuit is fixed on a front end bridge, the other end of the indicating circuit moves on a rear end bridge, the position, where the indicating circuit is located on the rear end bridge, is the fault point of a faulted cable core wire when a light-emitting diode is at a brightest state. The cable low resistance fault point positioning method provided by the invention is simple and reasonable in step and convenient for actual operations, does not affect normal operations of other cables on the cable bridge in the implementation process, avoids a defect of high cost brought about by exchanging the whole cable because the fault point cannot be found in the past, and is obvious in beneficial effect and convenient for application and popularization.

Description

Crane span structure cabling low resistance fault point positioning method
Technical field
The present invention relates to a kind of crane span structure cabling low resistance fault point positioning method, in particular, particularly relate to a kind of crane span structure cabling low resistance fault point positioning method utilizing the pressure drop gradually along crane span structure both sides of cable tear.
Background technology
In industrial factory building, power cable generally all adopts crane span structure to concentrate and lays.Cable, in the laid processes of metal crane span structure, is easy to the insulation course damaging cable.Under the acting in conjunction of the noise of industrial site, vibration and moisture vapor and corrosive gas, easily there is single-phase or between two-phase and crane span structure ultralow resistive fault in the cable that insulation course sustains damage.When not affecting other equipment and normally running, traditional action of low-voltage pulse and audio frequency sound detection cannot be utilized, the trouble spot of non-armouring rubber and plastic low-voltage cable is accurately located.
Due to metal crane span structure being laid with a large amount of cables, not only arrangement is tight in the horizontal direction for cable, and multiple-layer overlapped is arranged up and down, if can not locate accurately causing cable low resistance, if only carry out rough location, then need to check the cable in very long scope, implement very loaded down with trivial details, time-consuming.As our factory kiln tail blower fan service cable wherein a relative cable testing bridge shake survey resistance defective, cable specification is 3*240+3*50mm 2copper core cable, length is about 150 meters, and scene multimeter test failure resistance is 90 Ω, is judged as low-voltage cable fault property ultralow relative to crane span structure resistance fault.Consult related data and consulting profession company, all have no idea to utilize existing instrument to carry out localization of fault detection, can only change cable, cost is huge.
Summary of the invention
The present invention, in order to overcome the shortcoming of above-mentioned technical matters, provides a kind of crane span structure cabling low resistance fault point positioning method.
Crane span structure cabling low resistance fault point positioning method of the present invention, its special feature is, realized by following steps: a). judge the character of cable fault, after unsettled for each heart yearn in cable, megger is utilized to measure the resistance of cable relative to cable testing bridge, if be high-impedance state, then show that this cable core insulativity is good, there is not fault; If tested cable core is low resistance, then show that this cable core exists low resistance fault, perform step b); B). measure low resistance size, one end of selected failure cable heart yearn is measuring junction, measures the resistance size between failure cable heart yearn and cable testing bridge with multimeter; C). measure accurate resistance, utilize low-voltage dc power supply to measure the accurate resistance between failure cable heart yearn and cable testing bridge, if the registration of the voltage table of low-voltage dc power supply and reometer is respectively by voltammetry , , then the resistance between failure cable heart yearn and cable testing bridge is calculated by formula (1) :
(1) ;
D). the coarse localization of Method of Cable Trouble Point, utilizes the impulse method of electric cable failure detector, is first connected on by two ends of electric cable failure detector between the good cable core of insulation and crane span structure, utilizes reflection configuration, measures cable length; And then on fault phase, carry out the measurement of multiple reflection shape, by the contrast to waveform between the good heart yearn of insulation and fault heart yearn, draw the rough position of failure cable heart yearn trouble spot; E). the accurate location of Method of Cable Trouble Point, yoke plate between the adjacent cable crane span structure of rough position front end, trouble spot or connecting line are taken apart, to make to insulate between the cable testing bridge before and after this place, the cable testing bridge of rear and front end, the place of taking apart is claimed to be 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 measuring junction and crane span structure, again by current-limiting resistance and light emitting diode by forming indicating circuit after cable series connection, one end of indicating circuit is fixed on the crane span structure of front end, the other end moves on the crane span structure of rear end, the brightness of light emitting diode is observed in the process of movement, light emitting diode have the brightest state time, the position of indicating circuit on the crane span structure of rear end is the trouble spot of failure cable heart yearn, the cable of fault point is routed up, the abort situation of cable can be found out easily and accurately.
Crane span structure cabling low resistance fault point positioning method of the present invention, step c) in the process measuring accurate resistance, the low-voltage dc power supply adopted is made up of transformer, finishing circuit, insurance resistance, filter capacitor, slide rheostat, reometer, voltage table, K switch 1 and K switch 2, K switch 1 is series on the primary side loop of transformer, and rectification circuit is connected to the secondary side of transformer; Be connected to the output terminal of rectification circuit after the series connection of insurance resistance, slide rheostat and reometer, two ends of filter capacitor and voltage table are connected on two output terminals of rectification circuit; The measurement of accurate resistance is realized by once step: c-1). and measure and connect, low-voltage dc power supply output terminal is connected to the measuring junction of failure cable heart yearn, another output terminal is connected on cable testing bridge; C-2). apply voltage, first Closing Switch K2, and then Closing Switch K1, low-voltage dc voltage is applied between failure cable heart yearn and cable testing bridge; C-3). obtain electric current and magnitude of voltage, have after instruction until voltage table and disconnect K2 again, and regulate the resistance in slide rheostat place in circuit, to make the registration of voltage table, reometer within reasonable range of readings, read the registration of voltage table , reometer registration .
Crane span structure cabling low resistance fault point positioning method of the present invention, step e) in the resistance of current-limiting resistance asked for by formula (2):
(2)
Wherein, for applying voltage, the i.e. registration of voltage table; for the rated operational voltage of light emitting diode, for the working current of light emitting diode under rated voltage.
The invention has the beneficial effects as follows: cable low resistance fault point positioning method of the present invention, first judge by megger and multimeter the cable core that there is low resistance fault, recycling low-voltage dc power supply measures the accurate resistance between failure cable heart yearn and cable testing bridge; Then by the pulse of comparison normal electrical conductor wire and the pulse of failure cable heart yearn, obtain the rough position of trouble spot, the crane span structure of Method of Cable Trouble Point front end is disconnected, finally utilize the feature that failure cable breakage increases gradually along the pressure drop of crane span structure, in the process of mobile indicating circuit, by judging the brightness of light emitting diode, the fault place of cable can be obtained exactly.
Cable low resistance fault point positioning method of the present invention, step is simple, reasonable, be convenient to practical operation, the normal work of other cable on cable testing bridge is not affected in the process implemented, avoid trouble spot in the past to look into and can not find and change the drawback of the high cost that whole piece cable brings, beneficial effect is remarkable, is convenient to application.
Accompanying drawing explanation
Fig. 1 utilizes low-voltage dc power supply to carry out the schematic diagram of accurate resistance measurement in the present invention;
Fig. 2 utilizes electric cable failure detector to carry out the schematic diagram measured in the present invention;
Fig. 3 is the schematic diagram utilizing reflection configuration to obtain failure cable rough position in the present invention;
Fig. 4 is the schematic diagram utilizing indicating circuit to obtain trouble spot elaborate position in the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Crane span structure cabling low resistance fault point positioning method of the present invention, is realized by following steps:
A). judge the character of cable fault, after unsettled for each heart yearn in cable, utilize megger to measure the resistance of cable relative to cable testing bridge, if be high-impedance state, then show that this cable core insulativity is good, there is not fault; If tested cable core is low resistance, then show that this cable core exists low resistance fault, perform step b);
B). measure low resistance size, one end of selected failure cable heart yearn is measuring junction, measures the resistance size between failure cable heart yearn and cable testing bridge with multimeter;
C). measure accurate resistance, utilize low-voltage dc power supply to measure the accurate resistance between failure cable heart yearn and cable testing bridge, if the registration of the voltage table of low-voltage dc power supply and reometer is respectively by voltammetry , , then the resistance between failure cable heart yearn and cable testing bridge is calculated by formula (1) :
(1) ;
As shown in Figure 1, give the schematic diagram utilizing low-voltage dc power supply to carry out accurate resistance measurement, shown low-voltage dc power supply is made up of transformer, finishing circuit, insurance resistance, filter capacitor, slide rheostat, reometer, voltage table, K switch 1 and K switch 2, K switch 1 is series on the primary side loop of transformer, and rectification circuit is connected to the secondary side of transformer; Be connected to the output terminal of rectification circuit after the series connection of insurance resistance, slide rheostat and reometer, two ends of filter capacitor and voltage table are connected on two output terminals of rectification circuit.
The measurement of accurate resistance is realized by once step:
C-1). measure and connect, low-voltage dc power supply output terminal is connected to the measuring junction of failure cable heart yearn, another output terminal is connected on cable testing bridge;
C-2). apply voltage, first Closing Switch K2, and then Closing Switch K1, low-voltage dc voltage is applied between failure cable heart yearn and cable testing bridge;
C-3). obtain electric current and magnitude of voltage, have after instruction until voltage table and disconnect K2 again, and regulate the resistance in slide rheostat place in circuit, to make the registration of voltage table, reometer within reasonable range of readings, read the registration of voltage table , reometer registration .
D). the coarse localization of Method of Cable Trouble Point, utilizes the impulse method of electric cable failure detector, is first connected on by two ends of electric cable failure detector between the good cable core of insulation and crane span structure, utilizes reflection configuration, measures cable length; And then on fault phase, carry out the measurement of multiple reflection shape, by the contrast to waveform between the good heart yearn of insulation and fault heart yearn, draw the rough position of failure cable heart yearn trouble spot;
As shown in Figure 2, give in the present invention and utilize electric cable failure detector to carry out the schematic diagram measured, Fig. 3 gives the schematic diagram utilizing reflection configuration to obtain failure cable rough position, by to the insulation reflection configuration of good heart yearn and the contrast of failure cable heart yearn reflection configuration, the Position Approximate of failure cable heart yearn trouble spot can be drawn.
E). the accurate location of Method of Cable Trouble Point, yoke plate between the adjacent cable crane span structure of rough position front end, trouble spot or connecting line are taken apart, to make to insulate between the cable testing bridge before and after this place, the cable testing bridge of rear and front end, the place of taking apart is claimed to be 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 measuring junction and crane span structure, again by current-limiting resistance and light emitting diode by forming indicating circuit after cable series connection, one end of indicating circuit is fixed on the crane span structure of front end, the other end moves on the crane span structure of rear end, the brightness of light emitting diode is observed in the process of movement, light emitting diode have the brightest state time, the position of indicating circuit on the crane span structure of rear end is the trouble spot of failure cable heart yearn, the cable of fault point is routed up, the abort situation of cable can be found out easily and accurately.
As shown in Figure 4, give in the present invention the schematic diagram utilizing indicating circuit to obtain trouble spot elaborate position, in this step, the resistance of current-limiting resistance asked for by formula (2):
(2)
Wherein, for applying voltage, the i.e. registration of voltage table; for the rated operational voltage of light emitting diode, for the working current of light emitting diode under rated voltage.

Claims (3)

1. a crane span structure cabling low resistance fault point positioning method, is characterized in that, is realized by following steps:
A). judge the character of cable fault, after unsettled for each heart yearn in cable, utilize megger to measure the resistance of cable relative to cable testing bridge, if be high-impedance state, then show that this cable core insulativity is good, there is not fault; If tested cable core is low resistance, then show that this cable core exists low resistance fault, perform step b);
B). measure low resistance size, one end of selected failure cable heart yearn is measuring junction, measures the resistance size between failure cable heart yearn and cable testing bridge with multimeter;
C). measure accurate resistance, utilize low-voltage dc power supply to measure the accurate resistance between failure cable heart yearn and cable testing bridge, if the registration of the voltage table of low-voltage dc power supply and reometer is respectively by voltammetry , , then the resistance between failure cable heart yearn and cable testing bridge is calculated by formula (1) :
(1) ;
D). the coarse localization of Method of Cable Trouble Point, utilizes the impulse method of electric cable failure detector, is first connected on by two ends of electric cable failure detector between the good cable core of insulation and crane span structure, utilizes reflection configuration, measures cable length; And then on fault phase, carry out the measurement of multiple reflection shape, by the contrast to waveform between the good heart yearn of insulation and fault heart yearn, draw the rough position of failure cable heart yearn trouble spot;
E). the accurate location of Method of Cable Trouble Point, yoke plate between the adjacent cable crane span structure of rough position front end, trouble spot or connecting line are taken apart, to make to insulate between the cable testing bridge before and after this place, the cable testing bridge of rear and front end, the place of taking apart is claimed to be 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 measuring junction and crane span structure, again by current-limiting resistance and light emitting diode by forming indicating circuit after cable series connection, one end of indicating circuit is fixed on the crane span structure of front end, the other end moves on the crane span structure of rear end, the brightness of light emitting diode is observed in the process of movement, light emitting diode have the brightest state time, the position of indicating circuit on the crane span structure of rear end is the trouble spot of failure cable heart yearn, the cable of fault point is routed up, the abort situation of cable can be found out easily and accurately.
2. crane span structure cabling low resistance fault point positioning method according to claim 1, it is characterized in that: step c) in the process measuring accurate resistance, the low-voltage dc power supply adopted is made up of transformer, finishing circuit, insurance resistance, filter capacitor, slide rheostat, reometer, voltage table, K switch 1 and K switch 2, K switch 1 is series on the primary side loop of transformer, and rectification circuit is connected to the secondary side of transformer; Be connected to the output terminal of rectification circuit after the series connection of insurance resistance, slide rheostat and reometer, two ends of filter capacitor and voltage table are connected on two output terminals of rectification circuit; The measurement of accurate resistance is realized by once step:
C-1). measure and connect, low-voltage dc power supply output terminal is connected to the measuring junction of failure cable heart yearn, another output terminal is connected on cable testing bridge;
C-2). apply voltage, first Closing Switch K2, and then Closing Switch K1, low-voltage dc voltage is applied between failure cable heart yearn and cable testing bridge;
C-3). obtain electric current and magnitude of voltage, have after instruction until voltage table and disconnect K2 again, and regulate the resistance in slide rheostat place in circuit, to make the registration of voltage table, reometer within reasonable range of readings, read the registration of voltage table , reometer registration .
3. crane span structure cabling low resistance fault point positioning method according to claim 1 and 2, is characterized in that: step e) in the resistance of current-limiting resistance asked for by formula (2):
(2)
Wherein, for applying voltage, the i.e. registration of voltage table; for the rated operational voltage of light emitting diode, for the working current of light emitting diode under rated voltage.
CN201510257545.5A 2015-05-19 2015-05-19 Crane span structure cabling low resistance fault point positioning method Active CN104833902B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

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Cited By (2)

* Cited by examiner, † Cited by third party
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

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