CN2874521Y - Cable fault pre-determined spot detector - Google Patents
Cable fault pre-determined spot detector Download PDFInfo
- Publication number
- CN2874521Y CN2874521Y CNU2005200244110U CN200520024411U CN2874521Y CN 2874521 Y CN2874521 Y CN 2874521Y CN U2005200244110 U CNU2005200244110 U CN U2005200244110U CN 200520024411 U CN200520024411 U CN 200520024411U CN 2874521 Y CN2874521 Y CN 2874521Y
- Authority
- CN
- China
- Prior art keywords
- direct supply
- conduction device
- unidirectional conduction
- unit
- power electric
- 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.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
Abstract
A cable failure point-locating detection device belonging to the electric failure detecting field is provided, which comprises a signal generation part and a signal receiving part. Output end of the signal generation part is connected with one of failure cable. The signal receiving part can move along the route of cables. The utility model is characterized in that the signal generation part comprises a high-voltage direct current pulse generation unit, an arc continuation unit, an audio frequency signal injection unit, and an electrification unit. After the output ends of high-voltage direct current pulse generation unit, the arc continuation unit, and the audio frequency signal injection unit are connected in series or tandem, they are linked to one end of the electrification unit. Another end of electrification unit is connected with one end of failure cables; signal receiving part comprises a magnetic field detection, amplification, and display devices. The utility model can greatly shorten the time for detection failures of long cables and reduce workload of treatment. With relatively lower producing cost, The utility model can be promoted extensively and can be used in the failure detection sector of various cables directly buried, laid with non-metal tubes, or laid in cable channels.
Description
Technical field
The utility model belongs to the field of detecting of electric fault, relates in particular to detection and location to power cable high resistive fault point.
Background technology
Along with the quickening of The development in society and economy and modernization construction paces, the power consumption of industrial and agricultural production and people's lives increases day by day, and is increasing to the demand of electric power, requires the safe operation of electrical network also more and more higher.
As the power cable that connects various electrical equipments, transmission and distribution electric energy, replaced the position of pole line gradually.The transmission performance of cable power supply is both stable at town and country internal ratio pole line, the reliability height, and take up an area of for a short time, and can not cause influence to the appearance of the city, be not subjected to the restriction of physical environment yet, thereby improved the security of power supply.A large amount of power transmission and distribution modes that adopt the underground power cable circuit to replace overhead transmission line have become the main trend of domestic and international transmission and distribution networks Future Development.
Power cable as transmission and the carrier that distributes electric energy and be connected various electrical equipments etc., plays critical effect in electric system, therefore, the safe operation of maintenance cable is a vital job.
Think that in theory it is less that power cable is influenced by external environment factor and human factor, the reliability of safe operation is very high.But the power cable operating experience of long-term accumulation and experimental study result confirm, the cable operation troubles takes place period this section in power cable line 1～5 year after putting into operation easily.
The main cause of power cable operation troubles is factors such as outside destroy, cable accessory workmanship defective, cable installation quality defective or cable body workmanship defective.
The situation more complicated that cable breaks down, in order to shorten the time of searching and overhauling of fault, unlikely influence is powered normally, must take to survey fast and effectively the method for seeking, could be not only soon but also accurate ground the trouble spot is found out going forward side by side robs repaiies.
The power cable fault test generally is divided into two steps: the one, and " bigness scale ", the 2nd, " fixed point ".At first, select correct method of testing, measure the probable ranges of trouble spot, i.e. " bigness scale " according to phenomenon of the failure; Then, use the particular location of the equipment localization of faults again, i.e. " fixed point ".
Open day is April 26 nineteen ninety-five, publication number is to disclose a kind of " electrion process of detection streamer break point " in the Chinese invention patent application of CN1101984A, the method is that the output terminal with a high voltage-small current generator is connected on the right side of broken string, and broken string is to the opposite side short circuit.High-tension electricity must produce electric discharge phenomena at the break point place, and electric discharge phenomena produce sound again.With the radio of a band probe, will pop one's head in and 3 move along cable sheath, when having moved to the discharging sound place, this position is exactly a break point.
But this method can only adapt to short distance, the closely detection among a small circle and the troubleshooting (promptly aforesaid " fixed point " detects) of cabling, its detection speed is slow, be subject to the interference of peripheral electromagnetic field, to having relatively high expectations of testing environment and user, the cable that lays for long distance, adopt the big occasion of cable that direct-buried mode lays or surrounding environment electromagnetic interference (EMI) and inapplicable.
The day for announcing is on April 8th, 1992, the Chinese patent of authorization CN1013618B discloses a kind of " detection system of power equipment earth fault and device ", its two magneto-optical sensors are installed separately the two ends at the section of cable, signal from magneto-optical sensor is transferred to light one power conversion circuit that is attached thereto by the fiber optic cables that are attached thereto, discriminator circuit judges whether earth fault and fault have taken place wherein according to the output signal of light one power conversion circuit, and according to magnetic value difference between light one power conversion circuit output signal or phase place or the two is in conjunction with judging.Though it has solved long detection problem apart from cabling, but whole detection device relates to magneto-optical sensor and the fiber optic cables isometric with the cable that is detected, implementation cost is higher, need when cable laying, fiber optic cables to be laid synchronously, incompatibility is carried out the trouble spot to the cable that has laid and is detected, and the user has implemented certain difficulty.
The utility model content
Technical problem to be solved in the utility model provide a kind of can be in long distance range to directly apply, direct-burried or the Method of Cable Trouble Point of wearing the cable that nonmetallic pipe lays are carried out quick Preliminary Determination, simple and practical, cable fault pre-determined spot detector that cost of manufacture is cheap.
The technical solution of the utility model is: a kind of cable fault pre-determined spot detector is provided, comprise that signal generation divides and signal receive section, the output terminal that its signal generation divides links to each other with an end of failure cable, its signal receive section can move along the path of laying of cable, it is characterized in that: described signal generation branch comprises the high-voltage dc pulse generating unit, continuous arc unit, sound signal is injected unit and discharge cell, described high-voltage dc pulse generating unit, after continuous arc unit and sound signal are injected the output terminal parallel connection or series connection of unit, be connected on an end of discharge cell, the other end of discharge cell links to each other with failure cable one end; Its described high-voltage dc pulse generating unit discharges to failure cable, lights electric arc in its trouble spot; The electric arc makeup energy of described continuous arc unit to having ignited prolongs the electric arc survival time; Described sound signal is injected the unit in the time period that arc stability exists, to audio frequency pulsating direct current electric current of cable stack; Described signal receiving part is divided into magnetic field detection, amplification and display device.
Wherein, described high-voltage dc pulse generating unit comprises high voltage direct current generator 9, high-voltage capacitance C1 and current-limiting resistance R1; The output terminal of high voltage direct current generator 9 is connected with the end of high-voltage capacitance C1 and current-limiting resistance R1, the other end ground connection of high-voltage capacitance C1, and the other end of current-limiting resistance R1 is connected with an end of discharge cell; Its high voltage direct current generator charges to high-voltage capacitance, and current-limiting resistance is to the discharge current performance damping action of high-voltage capacitance.
Its described continuous arc unit comprises direct supply 10, capacitor C 2 and unidirectional conduction device VD1; Described sound signal is injected the unit and is comprised direct supply 11, high-power electric and electronic switch 12, unidirectional conduction device VD5, audio frequency square-wave generator 13 and control circuit 14; Wherein, capacitor C 2 is attempted by the two ends of direct supply 10, and the output terminal of direct supply 10 is connected with the end of unidirectional conduction device VD1, and the other end of unidirectional conduction device VD1 is connected with an end of discharge cell; The output terminal of direct supply 11 is connected with the input end of high-power electric and electronic switch 12, the output terminal of high-power electric and electronic switch is connected with an end of discharge cell through unidirectional conduction device VD5, and control circuit 14 is connected through the control end of audio frequency square-wave generator 13 with high-power electric and electronic switching device 12; 2 chargings of 10 pairs of capacitor C of its direct supply are mended continuous electric current by the electric arc that unidirectional conduction device VD1 has ignited from trend, make the survival time lengthening of electric arc; Its unidirectional conduction device VD1 plays the effect of unidirectional isolation; Its direct supply 11 and audio frequency square-wave generator 13 inject an intermittent audio frequency pulsating direct current electric current to the cable stack on the basis of the electric arc that ignites under the control of high-power electric and electronic switch 12; Its unidirectional conduction device VD5 plays the effect of unidirectional isolation; Its high-power electric and electronic switch is controlled its turn-on and turn-off by audio frequency square-wave generator and control circuit.
Perhaps, its continuous arc unit comprises direct supply 10, capacitor C 2 and unidirectional conduction device VD1; Described sound signal is injected the unit and is comprised direct supply 11, high-power electric and electronic switch 12, unidirectional conduction device VD3, VD5, audio frequency square-wave generator 13 and control circuit 14; Wherein, direct supply 10 and direct supply 11 series connection, capacitor C 2 and unidirectional conduction device VD1 are attempted by the two ends of direct supply 10; The output terminal of direct supply 11 is connected with the input end of high-power electric and electronic switch 12, the output terminal of high-power electric and electronic switch is connected with an end of discharge cell through unidirectional conduction device VD5, and control circuit 14 is connected through the control end of audio frequency square-wave generator 13 with high-power electric and electronic switching device 12; Unidirectional conduction device VD5 is attempted by between the output terminal of the serial connection point of direct supply 10 and direct supply 11 and high-power electric and electronic switch 12; 2 chargings of 10 pairs of capacitor C of its direct supply are mended continuous electric current by the electric arc that unidirectional conduction device VD1, VD3 and VD5 have ignited from trend, make the survival time lengthening of electric arc; Its unidirectional conduction device VD1 plays the effect of unidirectional isolation; Its direct supply 11 and audio frequency square-wave generator 13 inject an intermittent audio frequency pulsating direct current electric current to the cable stack on the basis of the electric arc that ignites under the control of high-power electric and electronic switch 12; Its unidirectional conduction device VD3 and VD5 play the effect of unidirectional isolation; Its high-power electric and electronic switch is controlled its turn-on and turn-off by audio frequency square-wave generator and control circuit.
Again or, described continuous arc unit comprises direct supply 10, capacitor C 2 and unidirectional conduction device VD1; Described sound signal is injected the unit and is comprised at least two group direct supply 11A, 11B, and every group of direct supply correspondence is provided with corresponding high-power electric and electronic switch, unidirectional conduction device, audio frequency square-wave generator and control circuit; Wherein, capacitor C 2 is attempted by the two ends of direct supply 10, and the output terminal of direct supply 10 is connected with the end of unidirectional conduction device VD1, and the other end of unidirectional conduction device VD1 is connected with an end of discharge cell; Direct supply 11A, the 11B setting of connecting with the direct supply 10 of continuous arc unit, the output terminal of direct supply 11A, 11B connects with the input end of corresponding high-power electric and electronic switch respectively, the output terminal of each high-power electric and electronic switch is connected with an end of discharge cell through unidirectional conduction device, and each control circuit connects with the control end of corresponding high-power electric and electronic switching device through the audio frequency square-wave generator.
Between above-mentioned direct supply 10 and the unidirectional conduction device VD1 or between high-power electric and electronic switch and the unidirectional conduction device VD5, be provided with current-limiting resistance R2 or R3; Wherein, resistance R 2 is used to prolong the time of electric arc survival; Resistance R 3 is used to protect the high-power electric and electronic switching device.
Contact or the adjustable ball discharge of discharging gap that its described discharge cell 8 is high-voltage relays, driven by electromagnet.
Above-mentioned high-power electric and electronic switch can be IGBT, large power triode, metal-oxide-semiconductor or other high-power electric and electronic switching devices.
Above-mentioned unidirectional conduction device can be silicon stack, diode or controllable silicon.
Above-mentioned control circuit comprises the pulsed triggering circuit that pierce circuit and monostable circuit constitute.
Compared with the prior art, the utility model has the advantages that:
1. the mode of using the audio pulse stack to inject, make tested cable before the trouble spot, produce a tone currents magnetic field that easily is detected, when the user is being with the field signal receiver when cable is advanced, can be clear and definite know whether the trouble spot of passing by, can to variously directly apply, the trouble spot of the cable of direct-burried or cable installation in pipe carries out quick, preliminary mensuration;
2. used principle and method are simple, practical, can be in large-area scope the approximate location of failure judgement point apace, can shorten long trouble shooting time and work of treatment amount greatly apart from cabling, reduce the power failure fault to loss that the user caused;
3. its device cost of manufacture is cheap relatively, is easy to be convenient to promote into the user accepts.
Description of drawings
Below in conjunction with drawings and Examples the utility model is described further.
Fig. 1 is a kind of connection diagram of the utility model pick-up unit;
Fig. 2 is the another kind of connection diagram of the utility model pick-up unit;
Fig. 3 is another connection diagram of the utility model pick-up unit;
Fig. 4 is another connection diagram of the utility model pick-up unit;
Fig. 5 is the waveform synoptic diagram of each point among Fig. 1;
Fig. 6 is the wiring diagram of audio frequency square-wave generator embodiment;
Fig. 7 is the wiring diagram of control circuit embodiment;
Fig. 8 is the waveform synoptic diagram of control circuit each point;
Fig. 9 is the wiring diagram of high voltage direct current generator embodiment;
Figure 10 is the wiring diagram of direct supply embodiment.
1 is this pick-up unit among the figure, and 2 is audio frequency field signal receiver, and 3 is failure cable to be measured, 4 is the trouble spot, 5 is the high-voltage dc pulse generating unit, and 6 are continuous arc unit, and 7 are sound signal injection unit, 8 is discharge cell, 9 is high voltage direct current generator, 10,11,11A, 11B be direct supply, 12,12A, 12B be the high-power electric and electronic switch, 13 is the audio frequency square-wave generator, and 14 is control circuit.
Embodiment
Among Fig. 1, cable fault pre-determined spot detector comprises that signal generation divides 1 and signal receive section 2, and the output terminal that its signal generation divides links to each other with an end of failure cable 3, and its signal receive section can move along the path of laying of cable.
Wherein, the signal generation branch comprises high-voltage dc pulse generating unit 5, continuous arc unit 6, sound signal injection unit 7 and discharge cell 8, after high-voltage dc pulse generating unit, continuous arc unit and sound signal are injected the output terminal parallel connection or series connection (this figure is a parallel form) of unit, be connected on an end of discharge cell, the other end of discharge cell links to each other with failure cable one end, and the trouble spot of cable is represented with 4.
Its described high-voltage dc pulse generating unit discharges to failure cable, lights electric arc in its trouble spot; The electric arc makeup energy of described continuous arc unit to having ignited prolongs the electric arc survival time; Described sound signal is injected the unit in the time period that arc stability exists, to audio frequency pulsating direct current electric current of cable stack; Described signal receiving part is divided into magnetic field detection, amplification and display device.
Concrete, high-voltage dc pulse generating unit 5 comprises high voltage direct current generator 9, high-voltage capacitance C1 and current-limiting resistance R1; The output terminal of high voltage direct current generator 9 is connected with the end of high-voltage capacitance C1 and current-limiting resistance R1, the other end ground connection of high-voltage capacitance C1, and the other end of current-limiting resistance R1 is connected with an end of discharge cell.
Its high voltage direct current generator charges to high-voltage capacitance, and current-limiting resistance is to the discharge current performance damping action of high-voltage capacitance.
2 chargings of 10 pairs of capacitor C of its direct supply are mended continuous electric current by the electric arc that unidirectional conduction device VD1 has ignited from trend, make the survival time lengthening of electric arc; Its unidirectional conduction device VD1 plays the effect of unidirectional isolation; Its direct supply 11 and audio frequency square-wave generator 13 inject the intermittent audio frequency pulsating direct current electric current of a big amplitude to the cable stack on the basis of the electric arc that ignites under the control of high-power electric and electronic switch 12; Its unidirectional conduction device VD5 plays the effect of unidirectional isolation; Its high-power electric and electronic switch is controlled its turn-on and turn-off by audio frequency square-wave generator and control circuit.
High voltage direct current generator 9 can be made up of power frequency high voltage transformer and high voltage silicon rectifier stack, or is the intermediate frequency or the high frequency high voltage direct current generator of Switching Power Supply form.
High voltage direct current generator charges to high-voltage capacitance, and current-limiting resistance is to the discharge current performance damping action of high-voltage capacitance.By the unilateal conduction characteristic of the unidirectional breakover element-silicon stack of inside, unit realize between the unit protection and to the discharge of failure cable.
The output voltage of high-voltage D.C. generator should be more than 3000V.High voltage direct current generator among this figure is negative polarity output.
Current-limiting resistance R1 wherein is according to the difference of high-voltage dc pulse generating unit output voltage, and its resistance can be selected between 10 Ω～1000 Ω.
The electric capacity of the capacitor C 2 in the continuous arc unit should be greater than the electric capacity of C1, and the capacity of C2 is big, helps the prolongation of continuous arc time.
The high-power electric and electronic switch can be IGBT, large power triode, metal-oxide-semiconductor or other high-power electric and electronic switching devices, and the selection of its model is as follows:
IGBT:BSM75GB120DN2, BSM100GB120DN2, SKM 100GAR 123D, FF100R12KS4 or FMG2G75US120;
High-power MOS tube: STE50DE100, IXFB80N50Q, IXFB38N100Q, IRFIB5N50L or IRFPS40N60K;
Turn-off SCR: 5SGA 06D4502.
The high-power electric and electronic switch is controlled its turn-on and turn-off by audio frequency square-wave generator and control circuit.
Its unidirectional conduction device VD1～VD5 can be silicon stack, diode or controllable silicon.
The some milliseconds of time control circuit control audio square-wave generator in the control circuit after electric discharge device (if electric discharge device is controlled) closure bring into operation, also can be after detecting the pulse current output of high-voltage dc pulse generating unit with a current impulse pick-up unit, start-up time control circuit, the some millisecond that its control audio square-wave generator is lighted at electric arc brings into operation.
The audio frequency square-wave generator is behind some milliseconds that bring into operation, and time control circuit is controlled it and quit work, and before the work of audio frequency square-wave generator and after quitting work, the high-power electric and electronic switch is in off state.
Should be shorter than high-voltage dc pulse generating unit and continuous arc unit cause electric arc on Method of Cable Trouble Point time the working time of audio frequency square-wave generator.
Between described direct supply 10 and the unidirectional conduction device VD1 or between high-power electric and electronic switch and the unidirectional conduction device VD5, also be provided with current-limiting resistance R2 or R3; Wherein, resistance R 2 is used to prolong the time of electric arc survival; Resistance R 3 is used to protect the high-power electric and electronic switching device.According to test findings, both select for use the resistance of ohm level to get final product.
The signal receiving portion is divided into magnetic field detection, amplification and display device, and this belongs to prior art, in this no longer detailed genus.
In this figure, be essentially the overlaying relation of electric current between continuous arc unit and the sound signal.
By above device and annexation thereof, on cable under test, injected the audio frequency pulsating direct current electric current of big amplitude intermittently, this tone currents at Method of Cable Trouble Point 4 places by arc short circuit, no longer continue to propagate forward, receive the magnetic field that this electric current gives off by cable by magnetic field detection, amplification and display device, the amplitude in audio frequency magnetic field is much higher than trouble spot audio frequency magnetic field amplitude afterwards before the trouble spot, can judge detector for magnetic field place and the place ahead, trouble spot or rear by this method.
Among Fig. 2, continuous arc unit injects with sound signal and adopts the series connection form to be connected between the unit.
Its continuous arc unit comprises direct supply 10, capacitor C 2 and unidirectional conduction device VD1; Sound signal is injected the unit and is comprised direct supply 11, high-power electric and electronic switch 12, unidirectional conduction device VD3, VD5, audio frequency square-wave generator 13 and control circuit 14.
Wherein, direct supply 10 and direct supply 11 series connection, capacitor C 2 and unidirectional conduction device VD1 are attempted by the two ends of direct supply 10.
The output terminal of direct supply 11 is connected with the input end of high-power electric and electronic switch 12, the output terminal of high-power electric and electronic switch is connected with an end of discharge cell through unidirectional conduction device VD5, and control circuit 14 is connected through the control end of audio frequency square-wave generator 13 with high-power electric and electronic switching device 12.
Unidirectional conduction device VD5 is attempted by between the output terminal of the serial connection point of direct supply 10 and direct supply 11 and high-power electric and electronic switch 12.
2 chargings of 10 pairs of capacitor C of its direct supply are mended continuous electric current by the electric arc that unidirectional conduction device VD1, VD3 and VD5 have ignited from trend, make the survival time lengthening of electric arc; Its unidirectional conduction device VD1 plays the effect of unidirectional isolation.
Its direct supply 11 and audio frequency square-wave generator 13 inject an intermittent audio frequency pulsating direct current electric current to the cable stack on the basis of the electric arc that ignites under the control of high-power electric and electronic switch 12; Its unidirectional conduction device VD3 and VD5 play the effect of unidirectional isolation; Its high-power electric and electronic switch is controlled its turn-on and turn-off by audio frequency square-wave generator and control circuit.
All the other same Fig. 1.
In this figure, be essentially the overlaying relation of current/voltage between continuous arc unit and the sound signal.
Adopting the purposes of direct supply 10 and 11 series connection, is the voltage and the capacity that can reduce direct supply 11, can reduce the volume of whole device and to the requirement of direct supply, more helps through engineering approaches and improve its practicality.
Among Fig. 3, sound signal is injected the circuit structure form that the unit adopts two-stage series connection, and continuous arc unit injects with sound signal and adopts the series connection form to be connected between the unit.
Its sound signal is injected the unit and is comprised at least two group direct supply 11A, 11B, every group of direct supply correspondence is provided with corresponding high-power electric and electronic switch, unidirectional conduction device, audio frequency square-wave generator and control circuit (among the figure in order to simplify, not shown audio frequency square-wave generator and control circuit, down together).
Wherein, direct supply 11A, the 11B setting of connecting with the direct supply 10 of continuous arc unit, the output terminal of direct supply 11A, 11B connects with the input end of corresponding high-power electric and electronic switch respectively, the output terminal of each high-power electric and electronic switch is connected with an end of discharge cell through unidirectional conduction device, and each control circuit connects with the control end of corresponding high-power electric and electronic switching device through the audio frequency square-wave generator.
All the other are with Fig. 1 or Fig. 2.
At least two group direct supply 11A and 11B are set, every group of direct supply correspondence is provided with corresponding high-power electric and electronic switch, unidirectional conduction device, audio frequency square-wave generator and control circuit, its objective is the requirement of withstand voltage of reduction to the high-power electric and electronic switch, reduce the electric pressure of direct supply 11A and 11B, with volume and the manufacturing cost that reduces whole device.
Among Fig. 4, according to above-mentioned thinking, continuous arc unit also can adopt the circuit structure form of two groups or more direct supply serial connection, its continuous arc unit promptly adopts the circuit structure form of two groups of direct supply 10A, 10B series connection among this figure embodiment, with further reduction each is organized the voltage of direct supply and the requirement of capacity, its concrete circuit those skilled in the art should be easy to and can realize, no longer is described in detail at this.
All the other same Fig. 1,2 or 3.
Among Fig. 5, be the work wave that example illustrates this device each point, to help to understand principle of work of the present utility model with the circuit structure of Fig. 1.
Wherein, output voltage waveform when A works independently for the high-voltage dc pulse generating unit, output voltage waveform when B works independently for continuous arc unit, C is the output voltage waveform of sound signal when injecting the unit and working independently, when D works for each unit associations, to the cable voltage waveform signal figure of middle injection, E is the signal that signal receiver received before Method of Cable Trouble Point, through resonance, filtering, signal waveforms after the amplification, F is the signal that signal receiver receives after Method of Cable Trouble Point, through resonance, filtering, signal waveforms after the amplification.
As seen the discharge time of A extremely short, prolong the discharge time of B greatly, the pulsating direct current of C output audio, three's superposition reaches the effect of D, by relatively E and F as seen, the signal that detector for magnetic field received before the trouble spot is better than the signal after the trouble spot far away.
Fig. 6 is a kind of implementation of audio frequency square-wave generator 13, form pierce circuit by time-base integrated circuit 555 (IC is numbered U401 among the figure) and peripheral circuit thereof, its 3 pin output audio square-wave signal, it is controlled by PORT1 control mouthful process and door and allows output or forbid output, final signal is exported by the PORT2 mouth, PORT1 high level (logical one) allows output, low level (logical zero is forbidden output), and the level of PORT2 is a low level when forbidding exporting.
U402 among the figure is conventional AND circuit, and other elements do not have specific (special) requirements.
The audio frequency square-wave generator can adopt conventional square wave generation circuit, also can adopt conventional sine wave generating circuit to obtain the square-wave signal that needs after conversion/shaping, and this belongs to prior art, no longer narration.
Fig. 7 is a kind of implementation of control circuit 10, control circuit is formed pierce circuit by U501 time-base integrated circuit 555, control closing or dividing of electric discharge device 8, the closing of contact of output high level (logical one) control electric discharge device 8, the contact of output low level (logical zero) control electric discharge device 8 separately.The time of output logic 1, the time of output logic 0 was (to see the waveform that H is ordered among Fig. 8) between 1 second to 10 seconds between 0.1 second to 1 second.
In addition, constitute differentiating circuit by C503, R504, VD501 control only allows positive pulse to pass through, and the signal rising edge that H is ordered is converted into the positive polarity spike pulse, VT501, R503 form inverter circuit, and the positive polarity spike pulse is become negative polarity spike pulse (seeing I point waveform among Fig. 8).This spike pulse triggers the monostable circuit of being made up of U502 time-base integrated circuit 555 one, exports the positive pulse (seeing the waveform that J is ordered among Fig. 8) of a fixed width.This signal becomes negative pulse (seeing K point waveform among Fig. 8) through the phase inverter that R506, VT502, R507 constitute with it.This pulse is converted into negative polarity spike pulse (seeing L point waveform among Fig. 8) through differentiating circuit and the unidirectional turning circuit that C506, R508, VD502 constitute with its rising edge.This spike pulse triggers the monostable circuit of being made up of U503 time-base integrated circuit 555 two, exports the positive pulse (seeing the waveform that M is ordered among Fig. 8) of a fixed width.
As seen, the effect of monostable circuit one is the trigger pip that produces monostable circuit two, this trigger pip is later than some milliseconds after the electric discharge device closing of contact, monostable circuit two produces the control signal of audio frequency square-wave generator, stop output behind the some milliseconds of this signal controlling audio frequency square-wave generator output, the moment that stops to export must be before the electric discharge device contact separates.
Fig. 8 is the waveform synoptic diagram of control circuit each point, and its concrete implication is existing narration in to the description of Fig. 7.
Fig. 9 is a kind of implementation of high voltage direct current generator 9, is boosted by the 220V electric main of T101 high pressure Industrial Frequency Transformer to input, carries out unidirectional conducting control by the V101 silicon stack, carries out current-limiting protection by R101.
Figure 10 is a kind of implementation of direct supply, by the T201 Industrial Frequency Transformer 220V electric main of importing is carried out transformation and isolation, carries out rectification by the B201 rectifier bridge, carries out current-limiting protection by R201.
Adopt said method and device to carry out field test, its test result is as follows:
| Sequence number | The cable situation | The trouble spot is apart from the physical location of cable starting point | The predetermined point scope | Trouble spot front signal intensity | Signal intensity behind the | |
| 1 | Voltage cable grade: 10KV.Total length: 1200 meters nature of troubles: heart yearn is to armouring breakdown fault resistance: 5M | 1050 | 2 meters of front and back | | 30dB | |
| 2 | Electric pressure: 10KV.Total length: 560 meters nature of troubles: heart yearn is to armouring breakdown fault resistance: 1M | 360 | 3 meters of front and back | | 35dB | |
| 3 | Electric pressure: 600V.Total length: 210 meters nature of troubles: heart yearn is breakdown fault resistance over the ground: 20K | 90 meters | 1.5 meters of front and back | 80dB | 20dB |
By above-mentioned data as can be seen, the utility model can be in the scope of long distance to directly apply, the Method of Cable Trouble Point of the cable of direct-burried or cable installation in pipe carries out quick Preliminary Determination, its signal intensity contrast obviously is easy to be grasped and implement by the user.
Because the utility model adopts the mode of injecting a stack audio frequency pulsating direct current electric current signal and detect its current field on cable under test to detect, when the user is being with the field signal receiver when cable is advanced, can be clear and definite know whether the trouble spot of passing by, to various straight applying, the cable of direct-burried or cable installation in pipe, can be in large-area scope the approximate location of failure judgement point apace, can shorten long trouble shooting time and work of treatment amount greatly apart from cabling, reduce the power failure fault to loss that the user caused, its device cost of manufacture is cheap relatively, be easy to be convenient to promote for the user accepts and implements.
The utility model can be widely used in various direct-burrieds, wear the fault detect field of the cable that nonmetallic pipe lays or the cable tunnel lays.
Claims (10)
1. a cable fault pre-determined spot detector comprises that signal generation divides and signal receive section, and the output terminal that its signal generation divides links to each other with an end of failure cable, and its signal receive section can move along the path of laying of cable, it is characterized in that:
Described signal generation branch comprises high-voltage dc pulse generating unit, continuous arc unit, sound signal injection unit and discharge cell, after described high-voltage dc pulse generating unit, continuous arc unit and sound signal are injected the output terminal parallel connection or series connection of unit, be connected on an end of discharge cell, the other end of discharge cell links to each other with failure cable one end;
Described signal receiving part is divided into magnetic field detection, amplification and display device.
2. according to the described cable fault pre-determined spot detector of claim 1, it is characterized in that described high-voltage dc pulse generating unit comprises high voltage direct current generator (9), high-voltage capacitance (C1) and current-limiting resistance (R1);
Wherein, the output terminal of high voltage direct current generator (9) is connected with an end of high-voltage capacitance (C1) and current-limiting resistance (R1), the other end ground connection of high-voltage capacitance (C1), and the other end of current-limiting resistance (R1) is connected with an end of discharge cell.
3. according to the described cable fault pre-determined spot detector of claim 1, it is characterized in that described continuous arc unit comprises direct supply (10), electric capacity (C2) and unidirectional conduction device (VD1); Described sound signal is injected the unit and is comprised direct supply (11), high-power electric and electronic switch (12), unidirectional conduction device (VD5), audio frequency square-wave generator (13) and control circuit (14);
Wherein, electric capacity (C2) is attempted by the two ends of direct supply (10), and the output terminal of direct supply (10) is connected with an end of unidirectional conduction device (VD1), and the other end of unidirectional conduction device (VD1) is connected with an end of discharge cell;
The output terminal of direct supply (11) is connected with the input end of high-power electric and electronic switch (12), the output terminal of high-power electric and electronic switch is connected with an end of discharge cell through unidirectional conduction device (VD5), and control circuit (14) is connected through the control end of audio frequency square-wave generator (13) with high-power electric and electronic switching device (12).
4. according to the described cable fault pre-determined spot detector of claim 1, it is characterized in that described continuous arc unit comprises direct supply (10), electric capacity (C2) and unidirectional conduction device (VD1); Described sound signal is injected the unit and is comprised direct supply (11), high-power electric and electronic switch (12), unidirectional conduction device (VD3), (VD5), audio frequency square-wave generator (13) and control circuit (14);
Wherein, direct supply (10) and direct supply (11) series connection, electric capacity (C2) and unidirectional conduction device (VD1) are attempted by the two ends of direct supply (10);
The output terminal of direct supply (11) is connected with the input end of high-power electric and electronic switch (12), the output terminal of high-power electric and electronic switch is connected with an end of discharge cell through unidirectional conduction device (VD5), and control circuit (14) is connected through the control end of audio frequency square-wave generator (13) with high-power electric and electronic switching device (12);
Unidirectional conduction device (VD5) is attempted by between the output terminal of the serial connection point of direct supply (10) and direct supply (11) and high-power electric and electronic switch (12).
5 according to the described cable fault pre-determined spot detector of claim 1, it is characterized in that described continuous arc unit comprises direct supply (10), electric capacity (C2) and unidirectional conduction device (VD1); Described sound signal is injected the unit and is comprised at least two group direct supplys (11A), (11B), and every group of direct supply correspondence is provided with corresponding high-power electric and electronic switch, unidirectional conduction device, audio frequency square-wave generator and control circuit;
Wherein, electric capacity (C2) is attempted by the two ends of direct supply (10), and the output terminal of direct supply (10) is connected with an end of unidirectional conduction device (VD1), and the other end of unidirectional conduction device (VD1) is connected with an end of discharge cell;
Direct supply (11A), (11B) setting of connecting with the direct supply (10) of continuous arc unit, the output terminal of direct supply (11A), (11B) connects with the input end of corresponding high-power electric and electronic switch respectively, the output terminal of each high-power electric and electronic switch is connected with an end of discharge cell through unidirectional conduction device, and each control circuit connects with the control end of corresponding high-power electric and electronic switching device through the audio frequency square-wave generator.
6. according to claim 3,4 or 5 described cable fault pre-determined spot detectors, it is characterized in that between described direct supply (10) and the unidirectional conduction device (VD1) or between high-power electric and electronic switch and the unidirectional conduction device (VD5), be provided with current-limiting resistance (R2) or (R3).
7. according to the described cable fault pre-determined spot detector of claim 1, it is characterized in that described discharge cell (8) is a high-voltage relay, the contact or the adjustable ball discharge of discharging gap that are driven by electromagnet.
8. according to claim 3,4 or 5 described cable fault pre-determined spot detectors, it is characterized in that described high-power electric and electronic switch can be IGBT, large power triode, metal-oxide-semiconductor or other high-power electric and electronic switching devices.
9. according to claim 3,4 or 5 described cable fault pre-determined spot detectors, it is characterized in that described unidirectional conduction device can be silicon stack, diode or controllable silicon.
10. according to claim 3,4 or 5 described cable fault pre-determined spot detectors, it is characterized in that described control circuit comprises the pulsed triggering circuit that pierce circuit and monostable circuit constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200244110U CN2874521Y (en) | 2005-07-01 | 2005-07-01 | Cable fault pre-determined spot detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200244110U CN2874521Y (en) | 2005-07-01 | 2005-07-01 | Cable fault pre-determined spot detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2874521Y true CN2874521Y (en) | 2007-02-28 |
Family
ID=37781119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005200244110U Expired - Fee Related CN2874521Y (en) | 2005-07-01 | 2005-07-01 | Cable fault pre-determined spot detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2874521Y (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109568A (en) * | 2009-12-28 | 2011-06-29 | 中国铝业股份有限公司 | Cable fault diagnosis device for direct current (DC) impulse voltage generator |
| CN102305901A (en) * | 2011-06-03 | 2012-01-04 | 西安福润德电子科技有限公司 | Method for detecting cable fault point by impact oscillating wave principle |
| CN101196550B (en) * | 2007-12-21 | 2012-01-11 | 赵瑞琳 | Power cable monitoring device and method for monitoring power cable state using the same |
| CN102445634A (en) * | 2010-10-08 | 2012-05-09 | 黄洪全 | Power transmission line fault detection device |
| CN102540011A (en) * | 2010-12-20 | 2012-07-04 | 狄诺合众(北京)电子设备有限公司 | Fault point intellectualized diagnosis and repairing method for geothermal cable and device |
| CN103916202A (en) * | 2014-04-09 | 2014-07-09 | 大连海事大学 | Radio-frequency cable on-line fault monitoring device and monitoring method thereof |
| CN104655984A (en) * | 2015-01-12 | 2015-05-27 | 国家电网公司 | Method for testing power cable fault |
| CN104914353A (en) * | 2015-06-01 | 2015-09-16 | 苏州市华安普电力工程有限公司 | Power cable fault range finder device |
| CN105807175A (en) * | 2016-03-14 | 2016-07-27 | 袁月春 | Signal injection method and signal injection device for searching for single-phase earth fault |
| CN105929308A (en) * | 2016-07-14 | 2016-09-07 | 广西电网有限责任公司柳州供电局 | Protecting layer grounding positioning instrument |
| CN105954652A (en) * | 2016-07-14 | 2016-09-21 | 广西电网有限责任公司柳州供电局 | Sheath grounding fault point locating method |
| CN106646143A (en) * | 2016-12-20 | 2017-05-10 | 国网河北省电力公司电力科学研究院 | Method and system for puncturing high-resistance fault point of cable based on charge superposition principle |
| CN106932685A (en) * | 2017-03-18 | 2017-07-07 | 飞洲集团有限公司 | A kind of power cable and its on-line detection device of defects |
| CN108333463A (en) * | 2018-03-12 | 2018-07-27 | 合肥工业大学 | A kind of cable fault detecting device |
| CN108761276A (en) * | 2018-07-11 | 2018-11-06 | 云南电网有限责任公司电力科学研究院 | A kind of high voltage distribution line failure harvester and method |
| CN111095704A (en) * | 2018-08-21 | 2020-05-01 | 华为海洋网络有限公司 | Cable auxiliary equipment and submarine cable auxiliary system |
-
2005
- 2005-07-01 CN CNU2005200244110U patent/CN2874521Y/en not_active Expired - Fee Related
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101196550B (en) * | 2007-12-21 | 2012-01-11 | 赵瑞琳 | Power cable monitoring device and method for monitoring power cable state using the same |
| CN102109568A (en) * | 2009-12-28 | 2011-06-29 | 中国铝业股份有限公司 | Cable fault diagnosis device for direct current (DC) impulse voltage generator |
| CN102445634B (en) * | 2010-10-08 | 2015-11-25 | 黄洪全 | Failure detection device for power transmission line |
| CN102445634A (en) * | 2010-10-08 | 2012-05-09 | 黄洪全 | Power transmission line fault detection device |
| CN102540011A (en) * | 2010-12-20 | 2012-07-04 | 狄诺合众(北京)电子设备有限公司 | Fault point intellectualized diagnosis and repairing method for geothermal cable and device |
| CN102540011B (en) * | 2010-12-20 | 2016-06-29 | 狄诺瓦(北京)电子设备有限公司 | Geothermal electric cable Intelligent fault point diagnosis and restorative procedure and device |
| CN102305901A (en) * | 2011-06-03 | 2012-01-04 | 西安福润德电子科技有限公司 | Method for detecting cable fault point by impact oscillating wave principle |
| CN102305901B (en) * | 2011-06-03 | 2014-11-12 | 西安福润德电子科技有限公司 | Method for detecting cable fault point by impact oscillating wave principle |
| CN103916202A (en) * | 2014-04-09 | 2014-07-09 | 大连海事大学 | Radio-frequency cable on-line fault monitoring device and monitoring method thereof |
| CN104655984A (en) * | 2015-01-12 | 2015-05-27 | 国家电网公司 | Method for testing power cable fault |
| CN104914353A (en) * | 2015-06-01 | 2015-09-16 | 苏州市华安普电力工程有限公司 | Power cable fault range finder device |
| CN105807175B (en) * | 2016-03-14 | 2018-08-28 | 袁月春 | Signal method for implanting and the signal injection device for searching singlephase earth fault |
| CN105807175A (en) * | 2016-03-14 | 2016-07-27 | 袁月春 | Signal injection method and signal injection device for searching for single-phase earth fault |
| CN105929308A (en) * | 2016-07-14 | 2016-09-07 | 广西电网有限责任公司柳州供电局 | Protecting layer grounding positioning instrument |
| CN105954652A (en) * | 2016-07-14 | 2016-09-21 | 广西电网有限责任公司柳州供电局 | Sheath grounding fault point locating method |
| CN106646143A (en) * | 2016-12-20 | 2017-05-10 | 国网河北省电力公司电力科学研究院 | Method and system for puncturing high-resistance fault point of cable based on charge superposition principle |
| CN106932685A (en) * | 2017-03-18 | 2017-07-07 | 飞洲集团有限公司 | A kind of power cable and its on-line detection device of defects |
| CN106932685B (en) * | 2017-03-18 | 2019-05-10 | 飞洲集团有限公司 | A kind of power cable and its on-line detection device of defects |
| CN108333463A (en) * | 2018-03-12 | 2018-07-27 | 合肥工业大学 | A kind of cable fault detecting device |
| CN108761276A (en) * | 2018-07-11 | 2018-11-06 | 云南电网有限责任公司电力科学研究院 | A kind of high voltage distribution line failure harvester and method |
| CN108761276B (en) * | 2018-07-11 | 2020-07-28 | 云南电网有限责任公司电力科学研究院 | High-voltage distribution line fault acquisition device and method |
| CN111095704A (en) * | 2018-08-21 | 2020-05-01 | 华为海洋网络有限公司 | Cable auxiliary equipment and submarine cable auxiliary system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2874521Y (en) | Cable fault pre-determined spot detector | |
| CN1719271A (en) | Cable failure prefixed point detection method and detection device | |
| CN104198906B (en) | A kind of device and method for IGBT dynamic characteristic measurings | |
| CN104772209B (en) | A kind of light-operated pulse for polycrystalline silicon crushing device triggers system | |
| WO2014110689A1 (en) | Three-dimensional focus induced polarization device for advanced geological forecast of water burst source in underground construction | |
| CN202093127U (en) | Device for detecting failure points and path orientation of cables by principle of impact oscillation waves | |
| CN202351374U (en) | Accurate locating device of local discharge point of power cable | |
| CN206116865U (en) | Laser diode drive circuit | |
| CN104467772A (en) | Pulse transformer type trigger | |
| CN102540642A (en) | Digital flash lamp and method for controlling flashing of digital flash lamp | |
| CN201467084U (en) | High-voltage pulse electronic fence circuit | |
| CN107165607A (en) | The transformation device and its method of work of a kind of shale frequency spectrum resonance reservoir | |
| CN105119233A (en) | Protection circuit | |
| CN206816239U (en) | A kind of transformation device of shale frequency spectrum resonance reservoir | |
| CN105807185B (en) | A kind of device and method of power cable high resistive fault point resistance lowering | |
| CN106577384A (en) | Fish state monitoring device capable of achieving multi-angle thunderstrike | |
| CN202886528U (en) | Test device for identifying high-voltage cables | |
| CN107448882A (en) | A kind of vcehicular tunnel energy efficient lighting system | |
| CN104269898B (en) | Charging unit of super capacitor | |
| CN207460120U (en) | Two-stage discharge fast pulse generator | |
| CN204496015U (en) | A kind of controllable electric spark type elastic wave seismic source apparatus | |
| CN102955099A (en) | Testing method for high-voltage cable identification and device thereof | |
| CN103840765A (en) | Photovoltaic collector-shoe gear | |
| CN103926468B (en) | A kind of DC power system Capacitive current measuring circuit | |
| CN210982749U (en) | Grouped high-power intelligent electric spark source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070228 Termination date: 20130701 |