CN102955099A - Testing method for high-voltage cable identification and device thereof - Google Patents
Testing method for high-voltage cable identification and device thereof Download PDFInfo
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- CN102955099A CN102955099A CN2012104502120A CN201210450212A CN102955099A CN 102955099 A CN102955099 A CN 102955099A CN 2012104502120 A CN2012104502120 A CN 2012104502120A CN 201210450212 A CN201210450212 A CN 201210450212A CN 102955099 A CN102955099 A CN 102955099A
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Abstract
The invention provides a testing method for high-voltage cable identification and a device thereof; and the device comprises an electronic high-frequency and high-voltage signal generator and a signal receiving device. The electronic high-frequency and high-voltage signal generator comprises an electronic high-frequency and high-voltage direct current generation module, a pulse capacitor, a discharge unit, a battery and a low-voltage control circuit; the signal receiving device is connected with a flexible coil, and comprises a signal processing unit and a display. When the device works, the high-voltage output end of the electronic high-frequency and high-voltage signal generator is respectively connected between a metal conductor of a tested cable and the ground, and discharges to the cable periodically; the flexible coil is used for collecting the discharge signal on each cable in a groove and transmits the signal to the signal processing unit; and whether the cable is the tested cable is judged according to the display wave shape, and an identification result is automatically worked out. The device can effectively identify the cable to be marked; the battery supplies power, has low requirement on the operation environment, and is convenient to carry and use; and the impact of sensing voltage on the tested cable is effectively suppressed, so that the operation is safe and convenient.
Description
Technical field
The present invention relates to method of testing and device thereof that a kind of high-tension cable is differentiated, belong to the cable testing equipment field.
Background technology
Because urban renewal, present high-tension cable mostly is laid in the private cable ditch, the many cables but the raceway groove back warp often can walk abreast, and this brings huge difficulty to searching and identifying of cable.Present stage, commonly used cable discrimination method was to the multicore high-tension cable poor effect of UHV (ultra-high voltage) single core cable and voltage levels, was difficult to accurately judge the cable of testing.Because extra-high-tension cable and other voltage levels cables are difficult to accurately find the test cable of wanting in cable duct when breaking down or overhaul, must carry out the separate discriminating of cable.In traditional discrimination process, because the impact of operation cable induction voltage, induced voltage is fought back testing tool on the one hand, causes easily instrument internal to damage; On the other hand, the signal intensity of induced voltage will surpass the intensity of the detection signal that testing tool provides, and causes easily erroneous judgement disconnected.Therefore, it is all the more necessary to design method of testing and device that a kind of high-tension cable differentiates.
The method of testing that high-tension cable is differentiated and device thereof are a kind of new method and instrumentations that high-tension cable is carried out the phase place discriminating.It is comprised of signal generator and receiving trap two parts, can simply, fast, accurately find tested cable, can find fast tested cable in conduit line, reduces workload, increases work efficiency.
Summary of the invention
The technical problem to be solved in the present invention is: design a kind of method of testing and device thereof that can carry out fast the high-tension cable discriminating under strong induced electricity, can simply, fast, accurately find tested cable, reduce workload, increase work efficiency.
For achieving the above object, the method for testing that one aspect of the present invention provides a kind of high-tension cable to differentiate may further comprise the steps:
A. the metal core wire of tested target cable (or metal sheath) is connected by short-circuit line between publicly with cable in that test is terminal;
B. at test lead, apply the high-voltage discharging signal of one-period to moment between the metal core wire (terminal corresponding to the test in a step) of tested target cable and the earth, make between tested cable and the earth and form discharge loop;
C. in conduit line, use flexible coil that every cable is tested, signal receiving device gathers the signal on the every cable, carry out the analog digital conversion, show the signal waveform that collects at display, again according to the polarity of waveform, signal amplitude and discharge time the interval characteristic information, whether automatic discrimination is target cable, and shows judged result.
It is to adopt 5kV/10 μ F to carry out the energy storage discharge that the moment of described b step applies signal, and high tension voltage is 3kV, and high voltage pulse voltage can effectively overcome the impact of line-frequency induction voltage in the core much larger than the core induced voltage, and signal is easy to put on the cable.The cycle of signal is to set between the 6s to 15s.
The Zhou Changda 1m of the flexible coil of described c step, diameter are 30cm.
In the described c step, if discharge waveform polarity for just, and is spaced apart the signal period that the b step applies discharge time, then to be judged as be target cable to receiver, and display shows " √ "; If discharge waveform polarity is for negative, or amplitude is less than setting threshold, or discharge interval cycle for setting, then is judged as not to be target cable, and display shows " * ".
The device that the present invention provides a kind of high-tension cable to differentiate on the other hand, it comprises: electronic type high-frequency high-voltage signal generator and signal receiving device.
Described electronic type high-frequency high-voltage signal generator comprises: electronic type high-frequency high-voltage direct-current generation module, impulse capacitor, discharge cell, low-voltage control circuit and chargeable high-capacity lithium battery; The output terminal of battery is connected to electronic type high-frequency and high-voltage generation module, and is connected to impulse capacitor, is the impulse capacitor charging; The low-pressure side of electronic type high-frequency high-voltage direct-current generation module connects gauge tap and pulse voltage indicating gauge, the high-voltage output end of electronic type high-frequency and high-voltage generation module is connected to discharge cell by impulse capacitor, low-voltage control circuit connects respectively described electronic type high-frequency high-voltage direct-current generation module and discharge cell, come the operated discharge unit by low-voltage control circuit, the energy that is stored on the impulse capacitor is discharged on the measured target cable.
Described signal receiving device comprises signal processing unit and display, and the input end of described signal processing unit connects flexible coil; Described flexible coil gathers the signal on the cable, be connected to signal processing unit, the signal waveform that finally collects is shown on the display, signal receiving device according to the polarity of shown waveform, signal amplitude and discharge time the interval judge and whether be the measured target cable and shown.
Described impulse capacitor is 5kV/10 μ F, and surge voltage is 3kV, more than the strong induced voltage several times, to overcome strong faradic impact, guarantees DC pulse is added on cable.
Include the bandpass filter that centre frequency is 2kHz in the described signal processing unit, be used for getting rid of the impact of 50Hz power current and the interference of other high-frequency currents, discharge pulse signal is extracted.
If it is target cable that described signal receiving device is judged current test cable, then display shows " √ "; If judging current test cable is not target cable, then display shows " * ".
Advantage of the present invention is: the method for testing and the device thereof that adopt a kind of high-tension cable of the present invention to differentiate, and can effectively protect testing tool can not damage by sensed voltage breakdown; Also can avoid to find quickly and accurately tested cable owing to the too high erroneous judgement that causes of induced voltage is disconnected; Device adopts powered battery, can adapt to complicated working environment, needn't be subjected to the impact of device power supply; This method of testing differentiates that accuracy rate is high, and instrumentation is simple, portable; Save a large amount of human and material resources and financial resources.
Description of drawings
Fig. 1 is principle of work synoptic diagram of the present invention.
Fig. 2 is the theory diagram of electronic type high-frequency high-voltage signal generator.
Fig. 3 is the realization block diagram of signal receiving device.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, ultimate principle of the present invention is: the metal core wire of tested cable (or metal sheath) is connected by short-circuit line between publicly with cable in that test is terminal; At test lead, apply the high-voltage discharging signal of one-period to moment between the metal core wire of tested cable (terminal corresponding to the test among a) and the earth, make between tested cable and the earth and form discharge loop; Use flexible coil that every cable is tested in conduit line, gather the signal on the every cable, check the signal waveform that collects, whether signal receiving device is tested cable according to the collection signal intelligent decision, automatically draws identification result.
It is to adopt 5kV/10 μ F impulse capacitor to carry out the energy storage discharge that moment applies signal, and high tension voltage is 3kV, and the cycle of cyclical signal can be adjusted to 6 to 15 seconds, and the Zhou Changda 1m of flexible coil, diameter are 30cm.
The proving installation that high-tension cable of the present invention is differentiated comprises: electronic type high-frequency high-voltage signal generator and signal receiving device.
As shown in Figure 2, described electronic type high-frequency high-voltage signal generator comprises: electronic type high-frequency high-voltage direct-current generation module, impulse capacitor, two discharge cells, low-voltage control circuit and chargeable high-capacity lithium batteries; The output terminal of battery is connected to electronic type high-frequency and high-voltage generation module, and is connected to impulse capacitor, is the impulse capacitor charging; The low-pressure side of electronic type high-frequency high-voltage direct-current generation module connects gauge tap and pulse voltage indicating gauge, and the high-voltage output end of electronic type high-frequency and high-voltage generation module is connected to discharge cell by impulse capacitor, the withstand voltage 5kV that reaches; Low-voltage control circuit connects respectively described electronic type high-frequency high-voltage direct-current generation module and discharge cell, come the operated discharge unit by low-voltage control circuit, a discharge cell is discharged into the energy that is stored on the impulse capacitor on the measured target cable, and pulse voltage can reach 3kV; Another discharge cell (can omit) is connected between described electronic type high-frequency high-voltage signal generator output end and the ground, when electronic type high-frequency high-voltage signal generator is worked, form over the ground a protection gap, when induced voltage during greater than 4kV, the gap is breakdown, over the ground discharge, protection electronic type high-frequency high-voltage signal generator; When electronic type high-frequency high-voltage signal generator power is closed with accident power-off, this discharge cell shorted to earth.
As shown in Figure 3, described signal receiving device comprises signal processing unit and display, and the input end of described signal processing unit connects flexible coil; Described flexible coil gathers the signal on the cable, be connected to signal processing unit, the signal waveform that finally collects is shown on the display, signal receiving device according to the polarity of shown waveform, signal amplitude and discharge time the interval judge and whether be the measured target cable and shown.If it is target cable that signal receiving device is judged current test cable, liquid crystal display shows " √ "; If current judgement test cable is not target cable, liquid crystal display shows " * ".
Introduce the course of work of the proving installation that described high-tension cable differentiates below by the explanation of the method for testing that described high-tension cable is differentiated, said method comprising the steps of:
1) metal core wire of tested cable is connected by short-circuit line between cable end piece and sheath, the earth.
2) at test lead, " cable " test clip of the output line of electronic type high-frequency high-voltage signal generator is connected to the metal core wire of tested cable, " ground connection " test clip of output line is connected to sheath, and sheath is wanted good earth.
3) open the switch of electronic type high-frequency high-voltage signal generator, set discharge cycle, the cycle can be set between 6s to 15s.Press switch knob, generator output high pressure, to tested cable discharge, every interval discharge cycle applies the high-voltage discharging signal of a 3kV between tested cable and the earth, makes between tested cable and the earth, the sheath and forms discharge loop.
4) in the conduit line that excavates, find many cables side by side, make its a little built on stilts, there are the needs of ponding to drain water.
5) flexible coil and signal receiving device are coupled together, the use flexible coil is measured the discharge signal on each bar cable, if tested cable, when fixedly discharge cycle discharges, show the larger positive dirction pulse of amplitude at signal receiving device, the signal period that shows is that instrument is judged as target cable when setting discharge cycle in the step 3, shows " √ " symbol in the liquid crystal upper right corner; Otherwise it is not target cable that instrument is judged, then can show " * " symbol, and the discharge waveform amplitude of liquid crystal display is less.
The proving installation of this method of testing design is fit to single core cable and most multicore high-tension cable.
The below is the embodiment that a high-tension cable is differentiated.
Differentiate that the high-tension cable parameter is as follows.
Model: YJV-6/10kV; Cross section: 185mm
2System of laying: tunnel style; Cable side by side: 5.
1, wiring.
The A of cable mutually endways with sheath, the earth short circuit, " cable " output terminal of electronic type high-frequency high-voltage signal generator is connected to the test lead of A phase, " ground connection " end of signal generator is connected to sheath, sheath must good earth; The Signal plug of flexible coil is inserted on the socket of signal receiving device.
2, test.
Open the switch of electronic type high-frequency high-voltage signal generator, begin cable is carried out periodic discharging, the setting discharge cycle is 6s.Tunnel location in that needs are differentiated has 5 cables to move towards side by side, and all the other 4 cables are charging operation.Use flexible coil to test respectively 5 cables, on 4 cables slight discharge waveform is arranged therein, amplitude is less, and discharge waveform polarity is for negative, and the signal receiving device liquid crystal display is " * ", namely is not tested cable; When a cable was tested, the waveforms amplitude that receiving trap shows was larger, and shows that twice discharge is spaced apart 6s, and discharge waveform polarity is for just, and installing liquid crystal display is " √ ", is test cable.
Can find out that from above example the present invention can find quickly and accurately and be differentiated cable, complete realistic requirements of one's work.
Claims (10)
1. the method for testing that high-tension cable is differentiated is characterized in that, may further comprise the steps:
A. the metal core wire of tested target cable or metal sheath are connected by short-circuit line between publicly with cable in that test is terminal;
B. at test lead, apply the high-voltage discharging signal of one-period to moment between the metal core wire of tested target cable and the earth, make between tested cable and the earth and form discharge loop;
C. in conduit line, use flexible coil that every cable is tested, signal receiving device gathers the signal on the every cable, carry out the analog digital conversion, show the signal waveform that collects at display, again according to the polarity of waveform, signal amplitude and discharge time the interval characteristic information, whether automatic discrimination is target cable, and shows judged result.
2. the method for testing differentiated of high-tension cable as claimed in claim 1 is characterized in that: the signal that described b step moment applies is to adopt 5kV/10 μ F to carry out the energy storage discharge.
3. the method for testing differentiated of high-tension cable as claimed in claim 1, it is characterized in that: the high tension voltage of described b step is 3kV.
4. the method for testing differentiated of high-tension cable as claimed in claim 1, it is characterized in that: the cycle of the signal of described b step is set between 6s to 15s.
5. the method for testing differentiated of high-tension cable as claimed in claim 1 is characterized in that: the Zhou Changda 1m of the flexible coil of described c step.
6. the method for testing differentiated of high-tension cable as claimed in claim 1 is characterized in that: in the c step, if discharge waveform polarity for just, and is spaced apart the signal period that the b step applies discharge time, then to be judged as be target cable to receiver; If discharge waveform polarity is for negative, or amplitude is less than setting threshold, or discharge interval cycle for setting, then is judged as not to be target cable.
7. the proving installation differentiated of a high-tension cable, it is characterized in that: comprise electronic type high-frequency high-voltage signal generator and signal receiving device, described electronic type high-frequency high-voltage signal generator comprises: electronic type high-frequency high-voltage direct-current generation module, impulse capacitor, discharge cell, low-voltage control circuit and chargeable high-capacity lithium battery; The output terminal of battery is connected to electronic type high-frequency and high-voltage generation module, and is connected to impulse capacitor, is the impulse capacitor charging; The low-pressure side of electronic type high-frequency high-voltage direct-current generation module connects gauge tap and pulse voltage indicating gauge, the high-voltage output end of electronic type high-frequency and high-voltage generation module is connected to discharge cell by impulse capacitor, low-voltage control circuit connects respectively described electronic type high-frequency high-voltage direct-current generation module and discharge cell, come the operated discharge unit by low-voltage control circuit, the energy that is stored on the impulse capacitor is discharged on the measured target cable; Described signal receiving device comprises signal processing unit and display, and the input end of described signal processing unit connects flexible coil; Described flexible coil gathers the signal on the cable, be connected to signal processing unit, the signal waveform that finally collects is shown on the display, signal receiving device according to the polarity of shown waveform, signal amplitude and discharge time the interval judge and whether be the measured target cable and shown.
8. the proving installation differentiated of high-tension cable as claimed in claim 7, it is characterized in that: described impulse capacitor is 5kV/10 μ F, and surge voltage is 3kV, 2 times of strong induced voltages or more than, to overcome strong faradic impact, guarantee DC pulse is added on cable.
9. the proving installation differentiated of high-tension cable as claimed in claim 7, it is characterized in that: include the bandpass filter that centre frequency is 2kHz in the described signal processing unit, be used for getting rid of the impact of 50Hz power current and the interference of other high-frequency currents, discharge pulse signal is extracted.
10. the proving installation differentiated of high-tension cable as claimed in claim 7 is characterized in that: be target cable if described signal receiving device is judged current test cable, then display shows " √ "; If judging current test cable is not target cable, then display shows " * ".
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104502120A CN102955099A (en) | 2012-11-12 | 2012-11-12 | Testing method for high-voltage cable identification and device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104502120A CN102955099A (en) | 2012-11-12 | 2012-11-12 | Testing method for high-voltage cable identification and device thereof |
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| CN102955099A true CN102955099A (en) | 2013-03-06 |
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| CN2012104502120A Pending CN102955099A (en) | 2012-11-12 | 2012-11-12 | Testing method for high-voltage cable identification and device thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407272A (en) * | 2014-12-16 | 2015-03-11 | 国家电网公司 | Cable identification device |
| CN104407271A (en) * | 2014-12-16 | 2015-03-11 | 国家电网公司 | Signal receiver for cable identification device |
| CN105785200A (en) * | 2016-04-29 | 2016-07-20 | 国网浙江省电力公司绍兴供电公司 | Operation equipment correspondence testing device |
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| JPH10155275A (en) * | 1996-11-20 | 1998-06-09 | Origin Electric Co Ltd | High-voltage generator with disconnection judgment function |
| CN1372645A (en) * | 1999-09-02 | 2002-10-02 | 特兰斯格里德公司 | Partial discharge monitoring system for transformers |
| CN2704851Y (en) * | 2003-09-03 | 2005-06-15 | 西安福润德电子科技有限公司 | Active electric cable identifiers |
| CN201060248Y (en) * | 2007-07-31 | 2008-05-14 | 重庆市电力公司江北供电局 | Electrical cable recognizer |
| CN201716368U (en) * | 2009-06-11 | 2011-01-19 | 严海林 | Device for analyzing and identifying phase of cable |
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- 2012-11-12 CN CN2012104502120A patent/CN102955099A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10155275A (en) * | 1996-11-20 | 1998-06-09 | Origin Electric Co Ltd | High-voltage generator with disconnection judgment function |
| CN1372645A (en) * | 1999-09-02 | 2002-10-02 | 特兰斯格里德公司 | Partial discharge monitoring system for transformers |
| CN2704851Y (en) * | 2003-09-03 | 2005-06-15 | 西安福润德电子科技有限公司 | Active electric cable identifiers |
| CN201060248Y (en) * | 2007-07-31 | 2008-05-14 | 重庆市电力公司江北供电局 | Electrical cable recognizer |
| CN201716368U (en) * | 2009-06-11 | 2011-01-19 | 严海林 | Device for analyzing and identifying phase of cable |
Non-Patent Citations (1)
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| 吴迪等: "高压电缆鉴别在迁改工程中的应用", 《电力与能源》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407272A (en) * | 2014-12-16 | 2015-03-11 | 国家电网公司 | Cable identification device |
| CN104407271A (en) * | 2014-12-16 | 2015-03-11 | 国家电网公司 | Signal receiver for cable identification device |
| CN105785200A (en) * | 2016-04-29 | 2016-07-20 | 国网浙江省电力公司绍兴供电公司 | Operation equipment correspondence testing device |
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Application publication date: 20130306 |