CN203643553U - Cable fault positioning and insulation aging test device - Google Patents
Cable fault positioning and insulation aging test device Download PDFInfo
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- CN203643553U CN203643553U CN201320875548.1U CN201320875548U CN203643553U CN 203643553 U CN203643553 U CN 203643553U CN 201320875548 U CN201320875548 U CN 201320875548U CN 203643553 U CN203643553 U CN 203643553U
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Abstract
The utility model discloses a cable fault positioning and insulation aging test device. The device comprises a computer, a signal generator, an acquisition device, a radio frequency power amplifier which is connected with the signal generator, a temperature sensor which is connected with the acquisition device, and a power supply, wherein the signal generator and the acquisition device are connected with the computer. The radio frequency power amplifier is connected with a first coaxial cable through a first coaxial cable connector. The first coaxial cable is connected with a tested cable. The tested cable is connected with a second coaxial cable through a second coaxial cable connector, and then is grounded. An acquisition port of the acquisition device is connected with the first coaxial cable connector and the second coaxial cable connector. The cable fault positioning and insulation aging test device provided by the utility model is used for fault detecting and fault positioning of the cable or a coil, wherein faults comprise burr, scratch, breakage, deformation, insulation aging and the like.
Description
Technical field
The utility model relates to test electric variable technical field, especially a kind of cable fault location and insulation ag(e)ing proving installation.
Background technology
The application of power cable in electric system is more and more wider, ensures that the safe operation of cable line is the basic demand to Operation of Electric Systems.Along with social high speed development, land resource day is becoming tight, and power circuit changed buried mode into by take up an area many open-wire line modes in the past gradually.Particularly recent years.Along with the development of China town and country and the modernization of national defense and the continuous progress of science and technology, make the application of circuit cable more extensive, its quantity is doubled and redoubled.The safe operation of cable line and people's production, live closely bound uply, the potential faults of cable line is seriously threatening the safety of people's life, property, and the impact that cable fault causes society is also increasing.The burst loss of power accident causes serious confusion not only can to people's normal production and life, also can cause huge loss to Utilities Electric Co..People can not accept to cause because of cable line fault the interruption of industrial and mineral industrial accident or banking system, rail transportation system, airdrome control Ji Changtiaoduleida system and life power supply etc.On the other hand, the fault detect of cable line is arduous more a lot of than overhead transmission line fault detect task, because cable line has direct observability unlike overhead transmission line.If the testing result of trouble spot and physical fault differ larger, so also just lose meaning.So, the pick-up unit that Cable fault examination claimed accuracy is higher.
Common are for the insulation assessment of power cable and the detection method of localization of fault pick-up unit: time domain pulse positioning method, ac voltage withstanding method, damp oscillatory wave test etc., but above test method is mainly subject to testing output signal frequency, test waveform restriction, being subject to site environment disturbs, and ac voltage withstanding method is because needs are exported tens thousand of volt high pressure, can cause damage to cable insulation itself.
The traditional experiment mode of connection is the outlet terminal load using tested cable as pilot system only, be that the center conductor of tested cable is as signal input part, and the earth terminal of tested cable and the earth terminal of pilot system are connected, therefore whether ground connection or the no multipoint earthing that exists all can directly affect measurement result of tested cable.
Utility model content
The purpose of this utility model is: for the problem of above-mentioned existence, provide cable fault location and the insulation ag(e)ing proving installation of the faults such as a kind of burr for detection of cable or coil, scuffing, breakage, distortion or insulation ag(e)ing and localization of fault.
The technical solution adopted in the utility model is as follows:
The utility model provides a kind of cable fault location and insulation ag(e)ing proving installation, comprise computing machine and connected signal generator and harvester, the radio-frequency power amplifier being connected with signal generator, the temperature sensor being connected with harvester, power supply, described radio-frequency power amplifier is connected with the first concentric cable by the first coaxial cable connector, described the first concentric cable connects tested cable, ground connection after described tested cable is connected with the second concentric cable by the second coaxial cable connector, the collection port of described harvester is connected with the first coaxial cable connector and the second coaxial cable connector.
Such scheme is done further preferably, and described computing machine is industrial computer or outside mobile PC.
Such scheme is done further preferably, and described signal generator is radio-frequency signal generator, can produce white noise signal, sinusoidal signal, pwm signal, swept-frequency signal.
Such scheme is done further preferably, described harvester is to have the three-channel digital storage oscilloscope of high-speed synchronous collection and waveform memory function or is the triple channel collector with independent collection and memory function, wherein, three passages can single channel work, also can triple channel parallel acquisition work simultaneously.
Such scheme is done further preferably, and described harvester is connected with computing machine by communication interface.
Such scheme is done further preferably, and described communication interface comprises WIFI interface, Ethernet interface and USB interface.
Such scheme is done further preferably, and described power supply is Chargeable direct current power supply.
Such scheme is done further preferably, and described the first coaxial cable connector and the second coaxial cable connector are the one in 3 female bnc connectors, 3 male bnc connectors, two male one female bnc connectors or two female one male bnc connectors.
In sum, owing to having adopted technique scheme, the beneficial effects of the utility model are:
1. the utility model adopts radio-frequency signal generator, can produce except comprising the waveform that sine wave, square wave, PWM ripple etc. are conventional, can also produce white noise signal, white noise signal, as the consistent distinctive signal of power spectrum density, can effectively shield on-the-spot interference; Radio-frequency signal generator frequency response range is wider, upper frequency limit can reach 1GHz, lower limit can reach 0.1Hz, can find with sensitivity the radio-frequency (RF) impedance difference that the faults such as cable burr, scuffing, breakage, distortion or insulation ag(e)ing show, can be used for length is the several meters of tests of the insulation fault to several hundred kilometers cable and location.
2. the utility model adopts special output connection design, the conductor that is tested cable all adopts concentric cable to be connected with earth terminal with the two ends of test output, junction adopts three ends of concentric cable adapter in parallel to be connected with harvester, thereby, harvester can gather the two-way voltage waveform that is applied to tested cable signal input end and signal output part, and harvester has waveform memory function, the two-way voltage waveform data of storage can be subsequent parameter and provide basic measurement data as the calculating of test output current, impedance, spectrum analysis, harmonic analysis etc.Generally speaking, this special output connection design is exactly the part using tested cable as output load, rather than if traditional experiment mode is using tested cable as terminator, therefore, under Connection Mode of the present utility model, whether the ground end of tested cable is connected with the earth or the no multipoint earthing that exists does not all affect proper testing of the present utility model and analysis.
3. the harvester that the utility model adopts is to have the three-channel digital storage oscilloscope of high-speed synchronous collection and waveform memory function or is the triple channel collector with independent collection and memory function, its sampling rate and sampling precision can be adjusted simultaneously, can realize and adjust comparatively flexibly test output scheme, as test waveform can suitably reduce sampling rate in the low frequency stage, in the time of needs Accurate Analysis waveform details, then improve sampling precision or sample frequency.
4. the sampling rate of the utility model harvester and sampling precision are subject to the control of computing machine, the advantage of design is to control flexibly output test and the measuring condition of whole cable fault location and insulation ag(e)ing proving installation like this, in the occasion not high to positioning requirements, can adopt lower sampling precision, as 10 sampling precisions, in the time that needs carry out cable characteristic impedance spectrum analysis, can adopt higher sampling precision, as 16 precision; The sampling environment of long-time running degree of precision can cause chip seriously to generate heat, and therefore can, by controlling flexibly the pattern of sampling precision, avoid harvester long-term work at maximum load state, thereby improve reliability and the life-span of device.
5. harvester of the present utility model is connected with temperature sensor, and for gathering environment temperature, the ambient temperature value collecting can be used for time domain pulse location, and the parameter of the calculating such as frequency domain pulse location or resonance impedance analysis is revised.
6. the utility model adopts Chargeable direct current power supply to power, and has avoided the interference of power supply high-frequency to test.
Accompanying drawing explanation
The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the theory diagram of the utility model a kind of cable fault location and insulation ag(e)ing proving installation;
Fig. 2 is the system panel figure of the industrial computer that in the utility model one embodiment, cable fault location and insulation ag(e)ing proving installation adopt;
Fig. 3 is the mode of connection figure that in the utility model one embodiment, cable fault is located and insulation ag(e)ing proving installation adopts.
In figure: 1 is touch display screen; 2 is USB interface; 3 is Ethernet interface; 4 is direct-current charging interface; 5 is power light; 6 is concentric cable bnc interface one; 7 is concentric cable bnc interface two; 8 is signal lamp; 9 is WIFI interface; 10 is DC component or external signal interface; 11 for impedance be first concentric cable of 50 ohm; 12 is tested cable; 13 for impedance be second concentric cable of 50 ohm.
Embodiment
Below in conjunction with drawings and Examples, the utility model is elaborated.
Be illustrated in figure 1 the theory diagram of the utility model a kind of cable fault location and insulation ag(e)ing proving installation.This device comprises computing machine and connected signal generator and harvester, the radio-frequency power amplifier being connected with signal generator, the temperature sensor being connected with harvester, power supply, described radio-frequency power amplifier is connected with the first concentric cable by the first coaxial cable connector, described the first concentric cable connects the center conductor of tested cable, ground connection after the ground end of described tested cable is connected with the second concentric cable by the second coaxial cable connector, the collection port of described harvester is connected with the first coaxial cable connector and the second coaxial cable connector.
Described computing machine is industrial computer or outside mobile PC.
Described signal generator is radio-frequency signal generator, can produce white noise signal, sinusoidal signal, pwm signal, swept-frequency signal, and signal bandwidth is in 0.1-1GHz scope, and amplitude is in 0.1-10V scope.Because described radiofrequency signal bandwidth covers 0.1Hz-1GHz, according to communication theory
for wavelength, v is rate of signal propagation, and f is signal frequency, establishes propagation rate and approaches the light velocity, as long as wavelength is less than cable length, can be used for Fault Identification and the location of cable.
For example: establishing cable length is 1 meter, must not be less than 299.79MHz according to calculating required test signal frequency, if cable length is 100km, test signal frequency must not be higher than 2.9979kHz, and rf frequency scope of the present utility model is 0.1Hz-1GHz, can covering cable length be at least 0.3 meter of localization of fault to 600 kilometer range and Fault Identification, and be applicable to cable and the coil of various insulating material and insulation voltage grade.
Described harvester is to have the three-channel digital storage oscilloscope of high-speed synchronous collection and waveform memory function or is the triple channel collector with independent collection and memory function, wherein, three passages can single channel work, also can triple channel parallel acquisition work simultaneously, triple channel sampling rate 1MHz-20GHz scope can arrange, and sampling precision 8-16 position can arrange.
Signal waveform amplitude after described radio-frequency power amplifier amplifying signal is 0.1-200V, and peak power is 1-200W.
Described harvester is connected with computing machine by communication interface.
Described communication interface comprises WIFI interface, Ethernet interface and USB interface.
Described power supply is Chargeable direct current power supply, and direct supply can not produce high-frequency test is caused to interference.
Described the first coaxial cable connector and the second coaxial cable connector are the one in 3 female bnc connectors, 3 male bnc connectors, two male one female bnc connectors or two female one male bnc connectors, bnc connector is all connected with 50 ohm of coaxial cables for high frequency of standard or 75 ohm of radio frequency coaxial-cables, adopt the pattern of three tunnels BNC tap in parallel both to can be used for the signal acquisition of harvester, also can be used for outside test signal as the input of DC component, low frequency signal etc., to realize more complicated test condition.
The mode of connection and triple channel signals collecting mode are measured in output described in the utility model, can: (1), by gathering output voltage signal and transmitted wave under single channel drainage pattern, realizes cable fault location based on Time Domain Reflectometry theory; (2) realize the analysis of cable characteristic impedance and resonant frequency point and calculate cable fault position by gathering the voltage signal of the test signal input end of tested cable and the test signal output terminal of tested cable under double channels acquisition pattern; (3) by gathering signal and the reflection configuration thereof of the tested cable signal input end based under frequency sweep mode under single channel drainage pattern, thereby adopt the Fault Locating Method based on frequency-domain analysis.Therefore, triple channel drainage pattern and output connection pattern that the utility model adopts can be for time domain reflectometries, frequency domain reflectometry, cable fault identification and location under three kinds of patterns of Cells with Impedance Technique in Frequency Domain.
The utility model adopts two-way concentric cable, because the impedance of concentric cable is 50 ohm of stationary values or 75 ohm, therefore utilize the electrically end of proving installation inside, can be applied to by the acquisition channel collection of two-way harvester the voltage signal of tested cable signal input end and signal output part, according to the amplitude difference of this two-way voltage signal, the frequency association of the corresponding different output test signals of mistiming XOR, or according to the waveform of single channel voltage signal and reflection configuration, can utilize time domain pulse location, the methods such as frequency domain pulse location or resonance impedance analysis realize localization of fault and identification, wherein, time domain impulse method and frequency pulse method only need an acquisition channel to test, resonance impedance analytical approach needs two-way acquisition channel to obtain the voltage waveform at tested cable two ends simultaneously.
In addition, collection of the present utility model also possesses the 3rd acquisition channel being connected with temperature sensor, and for gathering environment temperature, this ambient temperature value can be used for time domain pulse location, and the parameter of the calculating such as frequency domain pulse location or resonance impedance analysis is revised.
Because the above various application analysis method all needs the voltage waveform of single channel or double channels acquisition end to analyze, therefore the utility model requirement harvester is the digital storage oscilloscope with waveform memory function or the collector with waveform memory function, except for stored waveform data, also can be used for frequency, peak value, mean value, FFT data of storage signal etc.Another feature of harvester is that sampling rate and sampling precision are subject to industrial computer or outside mobile PC control, the advantage of design is to control flexibly output test and the measuring condition of whole cable fault location and insulation ag(e)ing testing apparatus like this, in the occasion not high to positioning requirements, can adopt lower sampling precision, as 10 sampling precisions, in the time that needs carry out cable characteristic impedance spectrum analysis, can adopt higher sampling precision, as 16 precision.And the sampling environment of long-time running degree of precision can cause chip seriously to generate heat, therefore the utility model, by controlling flexibly the pattern of sampling precision, avoids harvester long-term work at maximum load state, thereby improves device reliability and life-span.Meanwhile, the sampling rate of harvester can be adjusted flexibly, and when lower for proving installation test output signal frequency, available lower frequency sampling, when higher for testing apparatus test output signal frequency, availablely gathers compared with high sampling rate.In the time that sampling rate is higher, switch to lower sampling precision, while being 20G as equivalent sampling, sampling precision can adopt 8 of minimums, and this is conducive to reduce installation cost.Gather comparatively accurately waveform for guaranteeing to obtain, sampling rate can be the more than 16 times of test signal frequency.
Be illustrated in figure 2 the system panel figure of the industrial computer that the location of cable fault in the present embodiment and insulation ag(e)ing proving installation adopt.Described industrial computer comprises touch display screen 1, the left side of industrial computer system panel is respectively USB interface 2, Ethernet interface 3, direct-current charging interface 4, power light 5, the right is concentric cable bnc interface 1, concentric cable bnc interface 27, signal lamp 8, WIFI interface 9, DC component or external signal interface 10, described concentric cable bnc interface 1, concentric cable bnc interface 27 is for being applied to output test signal respectively metallic conductor and the earth terminal of tested cable, described DC component or external signal interface 10 are BNC adapters in parallel with concentric cable bnc interface 1, for under sophisticated testing environment more, apply DC component or apply other random test signals by outside, noise signals etc. carry out exporting after aliasing with proving installation internal output enable signal, described signal lamp 8 is used to indicate the inner output state of proving installation.
The internal system of industrial computer has embedded digital storage oscilloscope, the two-way acquisition channel of internal digital storage oscilloscope is respectively with the first concentric cable and the second concentric cable and connect, and concentric cable bnc interface 1 and concentric cable bnc interface 27 can be connected arbitrarily metal end or the ground end of tested cable.Connect because tested cable is used as suspension load, no matter therefore whether tested cable connects the earth, whether have multipoint earthing or no connection output load, all do not change test output connection structure, therefore, this mode of connection possesses higher application flexibility.
Different from traditional wired mode is, the traditional experiment mode of connection is the outlet terminal load using cable as proving installation only, be that metal end is as signal input part, and the earth terminal of tested cable and the earth terminal of proving installation are connected, therefore for whether ground connection or the no multipoint earthing that exists can directly affect measurement result of tested cable.And the mode of connection that the utility model adopts, tested cable is not the terminator as whole proving installation, but a series components of whole load circuit, i.e. actual output load comprises: concentric cable impedance, two loads of tested cable.Because the impedance of concentric cable is constant 50 ohm or 75 ohm, can regard constant as, therefore the voltage waveform producing on concentric cable after tested cable by gathering radio-frequency power amplifier output end voltage signal and signal, can draw the voltage vector variation characteristic of signal after tested cable insulation, the frequency of considering radio-frequency power amplifier output signal is to be subject to industrial computer control as known parameters, can realize time domain pulse location in conjunction with the further calculating of voltage waveform gathering, the localization of fault of frequency domain location and cable equivalent features impedance harmonic analysis etc.
If tested cable is 350kV, length is 380 kilometers, insulation system is XLPE material, mode of connection figure of the present utility model as shown in Figure 3, no matter whether tested cable 12 is connected with the earth, all be used as a part of cable fault described in the utility model location and insulation ag(e)ing proving installation output load link, and second concentric cable 13 that electrically end is 50 ohm with impedance of proving installation inside is connected.Because impedance is the effect of first concentric cable 11 of 50 ohm, do not form impact from the internal resistance of radio-frequency power amplifier for the measurements and calculations of test output impedance simultaneously.And another feature of the utility model is, impedance is that the first concentric cable and the impedance of 50 ohm is that the connected mode of the second concentric cable of 50 ohm is identical.
By gathering the signal input part of tested cable 12 and the two-way voltage signal of signal output part, can be for calculating the characteristic impedance value of tested cable 12, or only utilize acquisition channel one can realize the cable fault location of time domain impulse method, the impedance being connected with acquisition channel two under this pattern is that second concentric cable 13 of 50 ohm can be by short circuit, be connected with the earth terminal of radio-frequency power amplifier to realize directly, due to the BNC concentric cable pattern that output adopts, therefore only need the short-circuit line of a BNC connector to realize easily.Impedance is that second concentric cable 13 of 50 ohm is by the situation of short circuit, can also utilize the frequency sweep output mode of proving installation described in the utility model inside, realize the reflection configuration analysis of frequency from F1 to F2 band limits, be called frequency-domain analysis localization method, as follows for the function and usage simple list under different Connection Modes:
Remarks: above-mentioned signal input part refers to output terminal and tested cable 12 links of radio-frequency power amplifier, signal output part refers to the output terminal of radio-frequency power amplifier output signal after tested cable flows out, flow through after the output of tested cable and directly do not connect signal ground end due to signal, therefore can obtain by signals collecting port (above-mentioned acquisition channel two) the voltage waveform value of this port.The frequency of the voltage waveform that the voltage waveform gathering due to acquisition channel two and acquisition channel one gather and phase difference have represented the vector impedance feature of tested cable insulation, therefore can be directly used in the insulating medium impedance operator of calculating tested cable.
As can be seen here, by the Connection Mode of the present embodiment, can avoid radio-frequency power amplifier internal resistance impact, only need collection signal input end and signal output part two-way voltage signal to can be used for time domain pulse, the various calculation of parameter of three kinds of faults such as frequency domain pulse and impedance harmonic analysis and station-keeping mode, as rate of signal propagation, reflection time-difference, amplitude difference, cable resistance and Fourier transform, wavelet transformation etc., only depend on the voltage amplitude of acquisition channel one and acquisition channel two about the specific implementation localization of fault under three kinds of patterns and fault type recognition, the calculating of phase place and frequency parameter, concrete computation process does not describe in detail here, here only as providing these information sources of calculating basic data to explain.
The method that the present embodiment is described can complete by local industrial computer, also can be undertaken having controlled alternately by WIFI interface, Ethernet interface and the USB interface of outside mobile PC and proving installation.
You need to add is that, due to special wiring design and wider test signal radio frequency bandwidth, proving installation described in the utility model can be used for the cable of the various classes of insulation and insulating material, coil, as the power cable of XLPE insulation, oil-insulation power cable, signal controlling cable, small-signal concentric cable, overground cable etc.
The utility model is not limited to aforesaid embodiment.The utility model can expand to any new feature or any new combination disclosing in this manual, and the arbitrary new method disclosing or step or any new combination of process.
Claims (8)
1. a cable fault is located and insulation ag(e)ing proving installation, it is characterized in that: comprise computing machine and connected signal generator and harvester, the radio-frequency power amplifier being connected with signal generator, the temperature sensor being connected with harvester, power supply, described radio-frequency power amplifier is connected with the first concentric cable by the first coaxial cable connector, described the first concentric cable connects tested cable, ground connection after described tested cable is connected with the second concentric cable by the second coaxial cable connector, the collection port of described harvester is connected with the first coaxial cable connector and the second coaxial cable connector.
2. a kind of cable fault location according to claim 1 and insulation ag(e)ing proving installation, is characterized in that: described computing machine is industrial computer or outside mobile PC.
3. a kind of cable fault location according to claim 1 and insulation ag(e)ing proving installation, is characterized in that: described signal generator is radio-frequency signal generator.
4. a kind of cable fault location according to claim 1 and insulation ag(e)ing proving installation, is characterized in that: described harvester is digital storage oscilloscope or collector.
5. a kind of cable fault location according to claim 1 and insulation ag(e)ing proving installation, is characterized in that: described harvester is connected with computing machine by communication interface.
6. a kind of cable fault location according to claim 5 and insulation ag(e)ing proving installation, is characterized in that: described communication interface comprises WIFI interface, Ethernet interface and USB interface.
7. a kind of cable fault location according to claim 1 and insulation ag(e)ing proving installation, is characterized in that: described power supply is Chargeable direct current power supply.
8. a kind of cable fault location according to claim 1 and insulation ag(e)ing proving installation, is characterized in that: described the first coaxial cable connector and the second coaxial cable connector are the one in 3 female bnc connectors, 3 male bnc connectors, two male one female bnc connectors or two female one male bnc connectors.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320875548.1U CN203643553U (en) | 2013-12-20 | 2013-12-20 | Cable fault positioning and insulation aging test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320875548.1U CN203643553U (en) | 2013-12-20 | 2013-12-20 | Cable fault positioning and insulation aging test device |
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| CN203643553U true CN203643553U (en) | 2014-06-11 |
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| CN201320875548.1U Expired - Fee Related CN203643553U (en) | 2013-12-20 | 2013-12-20 | Cable fault positioning and insulation aging test device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090214A (en) * | 2014-07-31 | 2014-10-08 | 成都高斯电子技术有限公司 | Cable fault detection and aging analysis method |
| CN104391214A (en) * | 2014-11-14 | 2015-03-04 | 长春轨道客车股份有限公司 | ATI communication cable testing method |
| CN105301444A (en) * | 2015-10-14 | 2016-02-03 | 云南电网有限责任公司普洱供电局 | Single-port detection-based cable fault locating device |
| CN108008231A (en) * | 2016-10-30 | 2018-05-08 | 镇江亚昆机械有限公司 | A kind of frequency conversion electric wire cable fault high voltage testing device of convenient movement |
| CN112834871A (en) * | 2019-11-25 | 2021-05-25 | 国网江苏省电力有限公司南京供电分公司 | High-voltage long-section cable insulation fault online monitoring system and method |
| CN113820571A (en) * | 2021-09-03 | 2021-12-21 | 国网辽宁省电力有限公司沈阳供电公司 | Wind power plant cable insulation online monitoring method and device |
| CN113872097A (en) * | 2021-09-07 | 2021-12-31 | 成都四威高科技产业园有限公司 | Phase repairing method for step-type phase-stabilizing cable |
| CN114325239A (en) * | 2021-12-30 | 2022-04-12 | 成都高斯电子技术有限公司 | Fault positioning simulation device and fault positioning precision calibration method |
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2013
- 2013-12-20 CN CN201320875548.1U patent/CN203643553U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090214A (en) * | 2014-07-31 | 2014-10-08 | 成都高斯电子技术有限公司 | Cable fault detection and aging analysis method |
| CN104090214B (en) * | 2014-07-31 | 2016-08-17 | 成都高斯电子技术有限公司 | A kind of Cable fault examination and aging analysis method |
| CN104391214A (en) * | 2014-11-14 | 2015-03-04 | 长春轨道客车股份有限公司 | ATI communication cable testing method |
| CN105301444A (en) * | 2015-10-14 | 2016-02-03 | 云南电网有限责任公司普洱供电局 | Single-port detection-based cable fault locating device |
| CN108008231A (en) * | 2016-10-30 | 2018-05-08 | 镇江亚昆机械有限公司 | A kind of frequency conversion electric wire cable fault high voltage testing device of convenient movement |
| CN112834871A (en) * | 2019-11-25 | 2021-05-25 | 国网江苏省电力有限公司南京供电分公司 | High-voltage long-section cable insulation fault online monitoring system and method |
| CN113820571A (en) * | 2021-09-03 | 2021-12-21 | 国网辽宁省电力有限公司沈阳供电公司 | Wind power plant cable insulation online monitoring method and device |
| CN113820571B (en) * | 2021-09-03 | 2024-01-26 | 国网辽宁省电力有限公司沈阳供电公司 | Wind power plant cable insulation on-line monitoring method and device |
| CN113872097A (en) * | 2021-09-07 | 2021-12-31 | 成都四威高科技产业园有限公司 | Phase repairing method for step-type phase-stabilizing cable |
| CN114325239A (en) * | 2021-12-30 | 2022-04-12 | 成都高斯电子技术有限公司 | Fault positioning simulation device and fault positioning precision calibration method |
| CN114325239B (en) * | 2021-12-30 | 2024-01-19 | 成都高斯电子技术有限公司 | Fault positioning simulation device and fault positioning precision verification method |
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