CN109904932A - A kind of tractive power supply system 27.5kV high-tension cable on-line condition monitoring method and monitoring device - Google Patents
A kind of tractive power supply system 27.5kV high-tension cable on-line condition monitoring method and monitoring device Download PDFInfo
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- CN109904932A CN109904932A CN201910290822.0A CN201910290822A CN109904932A CN 109904932 A CN109904932 A CN 109904932A CN 201910290822 A CN201910290822 A CN 201910290822A CN 109904932 A CN109904932 A CN 109904932A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012806 monitoring device Methods 0.000 title abstract description 7
- 239000013307 optical fiber Substances 0.000 claims abstract description 63
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000000694 effects Effects 0.000 claims abstract description 14
- 238000001069 Raman spectroscopy Methods 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims description 34
- 238000009529 body temperature measurement Methods 0.000 claims description 22
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 6
- 238000000149 argon plasma sintering Methods 0.000 claims description 5
- 239000003063 flame retardant Substances 0.000 claims description 4
- 238000005253 cladding Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 229920001169 thermoplastic Polymers 0.000 claims description 2
- 239000004416 thermosoftening plastic Substances 0.000 claims description 2
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- 235000019504 cigarettes Nutrition 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 claims 1
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 3
- 230000008447 perception Effects 0.000 abstract 1
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- 238000007689 inspection Methods 0.000 description 1
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- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000005622 photoelectricity Effects 0.000 description 1
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- 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
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Abstract
The invention discloses a kind of tractive power supply system 27.5kV high-tension cable on-line condition monitoring method and monitoring devices, judge the operating status of 27.5kV high-tension cable with this using optical fiber perception high-precision to cable temperature.Distribution type fiber-optic is nested in 27.5kV high-tension cable by the present invention, according to the temperature and position of the Raman scattering effect of optical fiber and each point of optical time domain reflection effect measurement 27.5kV high-tension cable, and then judges the operating status of high-tension cable.The present invention is compared with traditional 27.5kV high-voltage cable state monitoring method, and measurement accuracy is high, and monitoring range is long, and the continuous measurement result of monitoring data is credible high, can carry out quick fault location to monitoring abnormal point；Monitoring system engineering adaptability itself is strong, not by electromagnetic interference, long service life, engineering economy with higher and practicability.
Description
Technical field
The present invention relates to a kind of traction power supplies to equip on-line monitoring field；More particularly to a kind of based on distribution type fiber-optic
Tractive power supply system 27.5kV high-voltage cable state monitoring method and monitoring device.
Background technique
From the high-speed railway of first 350km/h in China on the 1st of August in 2008 --- Beijing-Tianjin inter-city railway open operation with
Come, high-speed railway rapidly develops in China.2018, with the newly-built high-speed iron of a batch such as Jinan-Qingdao, Hangzhoupro is yellow, Kazakhstan is male, green salt, Nan Long
Road puts into effect, and the total operating mileage of China express railway has reached 2.9 ten thousand kilometers, becomes high-speed railway in the world and goes into operation in operation
Journey longest, the maximum country of building scale.
With the rapid development that China express railway is built, 27.5kV high-tension cable is in high-speed railway tractive power supply system
Application it is also more and more common；Compared with conventional overhead power transmission line, 27.5kV high-tension cable has insulation spacing between line small, takes up an area
It is few, it is not easy to be affected by the external environment, power supply reliability is high, and operation is simple and convenient, stands and holds the advantages that beautiful.However it is limited by production
The influence of technique, annex quality, mounting process, the 27.5kV high-tension cable failure rate run is higher, and cable machinery failure
It is generally slowly developed by latent defect by time integral, existing manual inspection mode is difficult to being embedded in underground
27.5kV high-tension cable operating status is accurately differentiated.So high-speed railway field 27.5kV high-tension cable is in daily fortune at present
There are that can not prejudge before failure in row, failure is difficult to the shortcomings that quickly positioning after occurring, and gives entire high-speed railway traction power supply system
There are hidden danger for system safe and reliable operation.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of high-speed railway tractive power supply system high safety and reliability,
It can satisfy scene operation maintenance, be suitable for 27.5kV high-tension cable on-line monitoring method and monitoring device.
The technical scheme adopted by the invention is that a kind of tractive power supply system 27.5kV high-tension cable on-line condition monitoring side
Method includes the following steps,
A. laser pulse signal transmitter is to the multimode temperature measuring optical being embedded in tractive power supply system 27.5kV high-tension cable
Cable emits laser pulse signal；
B. the initial power P of incident laser pulse signal is recorded0, frequency v0With t at the time of transmitting incident light0, and passed
Transport to the central processing unit in optical fiber temperature measurement host；
C. the back wave that photoelectric signal collection device acquisition multimode temperature-measuring optical fiber is generated by Raman scattering effect, and will acquisition
Reflection wave frequency and power transmission to central processing unit；
D. central processing unit calculated rate is poor | v, stokes light power Ps, frequency vsWith anti-Stokes light power Pa；
E. the temperature value and distance value at L are calculated；
F. the high-tension cable temperature value each measurement point real-time monitored with preset compared with alarm threshold value；Greater than report
The alarm signal of appropriate level is issued when alert threshold value.
Each measurement point is generated due to Raman scattering in the step C photoelectric signal collection device acquisition multimode temperature-measuring optical fiber
Stokes light and anti-Stokes light, enabling temperature apart from optical fiber temperature measurement host L at is T, then photoelectric signal collection device at this time
Collect the stokes light power P generated at Ls, frequency vsWith anti-Stokes light power Pa, frequency va, and arrive photoelectricity and acquire
The time of device is tL。
The step D central processing unit is according to incident light frequency v0, the frequency v of the stokes light of acquisitions, anti-stoke
The frequency v of this lighta, calculated rate difference Δ v, and obtain Ps, PaExpression formula；
Δ v=va-v0=v0-vs (1)
Wherein T is thermodynamic temperature, Ks、KaIt is the related system of stokes light and anti-Stokes light scattering interface respectively
Number, SbFor the coefficient of backscattering, x0、αs、αaIt is incident light, stokes light and anti-Stokes light scattering light respectively in light
Transmission loss in fibre, h are planck constant；K is Boltzmann's constant；Rs(T)、RaIt (T) is respectively the stoke in temperature T
This light and anti-Stokes light coefficient related with optical fiber molecular entergy level i on population.
The step D is by anti-Stokes light power PaWith stokes light power PsIt compares, can obtain apart from optical fiber temperature-measurement master
The expression formula of temperature T at machine L.
The step E is by the expression formula of temperature T at optical fiber temperature measurement host L and the preset fiducial temperature T of system0It compares
The occurrence of temperature T can be obtained；
The distance value at thermometric host L that can be asked according to optical time domain reflection effect.
L=(c*(tL-t0))*IOR/2 (9)
Wherein L is distance of the measurement point apart from photosignal transmitter, and c is the light velocity in vacuum, Δ t light pulse signal hair
The time difference that photoelectric signal collection device is arrived at back-scattering light is penetrated, IOR is optical fibre refractivity.
Central processing unit processing as processing L measurement point is distributed in 27.5kV high-tension cable measured on optical fiber
The temperature of each point and position.
It realizes the monitoring device of tractive power supply system 27.5kV high-tension cable on-line condition monitoring method, including is installed on
Multimode temperature-measuring optical fiber in 27.5kV high-tension cable, the multimode temperature-measuring optical fiber pass through E2000,8 ° of inclination angle flanges and optical fiber temperature-measurement
Host is connected.
The optical fiber temperature measurement host includes laser pulse signal transmitter, photoelectric signal collection device, central processing unit and shows
Show device；The laser pulse signal transmitter gives multimode temperature-measuring optical fiber transmitting 10ns to be delayed laser pulse, and by incident light frequency
With power trace to central processing unit；The photoelectric signal collection device acquisition multimode temperature-measuring optical fiber is generated because of Raman scattering effect
Back wave, and by the reflection wave frequency of acquisition and power transmission to central processing unit；Pass through display after central processing unit processing
Device is uploaded to scheduling duty room by temperature curve real-time display, and by complex automatic system.
The multimode temperature-measuring optical fiber is two core 62.5/125um, and multimode temperature-measuring optical fiber oversheath is the fire-retardant heat of low-smoke and non-halogen
Plastotype.
The multimode temperature-measuring optical fiber fiber attenuation coefficient is less than or equal to 0.8dB/km, and bandwidth is more than or equal to 500MHz/km, number
Value aperture is 0.2 ± 0.015NA, and core diameter is 62.5 ± 3 μm, and cladding diameter is 125 ± 2 μm, maximum pull 2000N, maximum
Compressive resistance is 400N/cm, and temperature-measuring range is -200 DEG C~+450 DEG C, and maximum measurement range is 30kM.
The invention has the advantages that due to can the operation of real-time monitoring 27.5kV high-tension cable when temperature, and then it is right
The operating status of 27.5kV high-tension cable realizes on-line monitoring, and it is safe and reliable to effectively increase high-speed railway tractive power supply system
Property.The present invention is compared with traditional 27.5kV high-voltage cable state monitoring method, and measurement accuracy is high, and monitoring range is long, monitors number
It is credible high according to continuous measurement result, quick fault location can be carried out to monitoring abnormal point；Monitoring system engineering itself adapts to
Property is strong, not by electromagnetic interference, long service life, engineering economy with higher and practicability.
Detailed description of the invention
Fig. 1 is tractive power supply system 27.5kV high-voltage cable state monitoring method flow diagram of the present invention；
Fig. 2 is 27.5kV high-voltage cable state monitoring structure drawing of device of the present invention.
In figure:
1, multimode temperature-measuring optical fiber 2, optical fiber temperature measurement host 3, laser pulse signal transmitter
4, photoelectric signal collection device 5, central processing unit 6, display
7, complex automatic system 8, scheduling duty room.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and detailed description:
27.5kV high-tension cable has electric current to pass through when putting into operation, inherently generates heat because of fuel factor；It is wrapped in 27.5kV
The insulating materials of high-tension cable surrounding also has corresponding dielectric loss, can also generate heat；And when high-tension cable normal operation, with high pressure
When cable leads to performance degradation because of running certain reasons, the temperature of generation is also inevitable different；It therefore can be by 27.5kV
The running temperature of high-tension cable is monitored on-line, and then the operating status of accurate judgement 27.5kV high-tension cable and development become
Gesture.In order to realize tractive power supply system safe and reliable operation, it is necessary to which around the temperature of 27.5kV high-tension cable, this key refers to
Mark, furthers investigate tractive power supply system 27.5kV high-tension cable on-line monitoring technique.
As shown in Figure 1, a kind of tractive power supply system 27.5kV high-tension cable on-line condition monitoring method of the present invention, including with
Lower step,
A. optical fiber temperature measurement host is by laser pulse signal transmitter therein to being embedded in tractive power supply system 27.5kV
Multimode temperature measuring optical cable in high-tension cable emits a 10ns delay laser pulse signal；
B. the initial power P of incident laser pulse signal is recorded0, frequency v0With t at the time of transmitting incident light0, and passed
Transport to the central processing unit in optical fiber temperature measurement host；
C. the optical fiber molecule in temperature-measuring optical fiber is had an effect with laser pulse, and each point in multimode temperature-measuring optical fiber is because drawing
Graceful scattering effect generates the stokes light and anti-Stokes light opposite with the incoming signal direction of propagation；In optical fiber temperature measurement host
Photoelectric signal collection device acquisition multimode temperature-measuring optical fiber in the stokes light that is generated due to Raman scattering of each measurement point and instead
Stokes light, enabling the temperature at optical fiber temperature measurement host L is T, then photoelectric signal collection device collects generation at L at this time
Stokes light power Ps, frequency vsWith anti-Stokes light power Pa, frequency va, and to photoelectric gathering apparatus time be tL, and
It is transmitted to central processing unit；
D. central processing unit is according to the frequency v of incident light0, the frequency v of collected stokes lights, anti-Stokes light
Frequency va, calculated rate is poor | v, and P can be obtaineds, PaExpression formula
Δ v=va-vo=v0-vs (1)
Wherein T is thermodynamic temperature, Ks、KaIt is the related system of stokes light and anti-Stokes light scattering interface respectively
Number, SbFor the coefficient of backscattering, α0、αs、αaIt is incident light, stokes light and anti-Stokes light scattering light respectively in light
Transmission loss in fibre, h are planck constant；K is Boltzmann's constant；Rs(T)、RaIt (T) is respectively the stoke in temperature T
This light and anti-Stokes light coefficient related with optical fiber molecular entergy level i on population；
By anti-Stokes light power PaWith stokes light power PsIt compares, the temperature at optical fiber temperature measurement host L can be obtained
The expression formula of T
By the expression formula of temperature T at optical fiber temperature measurement host L and the preset fiducial temperature T of system0Compared to temperature can be obtained
Spend the occurrence of T；
E. the distance value at thermometric host L that can be asked according to optical time domain reflection effect；The center of optical fiber temperature measurement host
Processor handles temperature and the position of each point of 27.5kV high-tension cable measured on distribution type fiber-optic as processing L measurement point
It sets
The distance value at thermometric host L that can be asked according to optical time domain reflection effect.
L=(c*(tL-t0))*IOR/2 (9)
Wherein L is distance of the measurement point apart from photosignal transmitter, and c is the light velocity in vacuum, Δ t light pulse signal hair
The time difference that photoelectric signal collection device is arrived at back-scattering light is penetrated, IOR is optical fibre refractivity；
F. the high-tension cable temperature value that each measurement point real-time monitors is compared with alarm threshold value is preset, according to tight
Weight degree issues the alarm signal of appropriate level, and the temperature value of cable temperature abnormal point and specific location are transferred to synthesis
Automated system, then scheduling duty room is uploaded to by complex automatic system.
As shown in Fig. 2, a kind of tractive power supply system 27.5kV high-tension cable on-line condition monitoring device of the present invention, including peace
Loaded on the multimode temperature-measuring optical fiber 1 in 27.5kV high-tension cable, multimode temperature-measuring optical fiber 1 is used as distributed temperature real-time monitoring and signal
Transport vehicle, by E2000,8 ° of inclination angle flanges are connected with optical fiber temperature measurement host 2.
The optical fiber temperature measurement host 2 includes laser pulse signal transmitter 3, photoelectric signal collection device 4, central processing unit 5
With display 6；The laser pulse signal transmitter 3 emits 10ns delay laser pulse to multimode temperature-measuring optical fiber 1, and will be incident
Light frequency and power trace are to central processing unit 5；The photoelectric signal collection device 4 acquires multimode temperature-measuring optical fiber 1 because of Raman scattering
Effect and the back wave generated, and by the reflection wave frequency of acquisition and power transmission to central processing unit 5；5 energy of central processing unit
Enough processing L measurement point equally handles the temperature for being distributed in each point of 27.5kV high-tension cable measured on optical fiber and position, place
By display 6 by temperature curve real-time display after reason, and scheduling duty room 8 is uploaded to by complex automatic system 7.It is described
Multimode temperature-measuring optical fiber 1 is two core 62.5/125um multimode fibres, and cable outer sheath uses the fire-retardant heat of high performance low-smoke and non-halogen
Molding material, temperature measuring optical cable have excellent thermal conduction characteristic, mechanical performance, waterproof performance and anticorrosion properties, multimode thermometric
1 oversheath of optical fiber is the fire-retardant thermoplastics type of low-smoke and non-halogen.1 fiber attenuation coefficient of multimode temperature-measuring optical fiber is less than or equal to 0.8dB/
Km, bandwidth are more than or equal to 500MHz/km, and numerical aperture is 0.2 ± 0.015NA, and core diameter is 62.5 ± 3 μm, cladding diameter 125
± 2 μm, maximum pull 2000N, Maximal compression force 400N/cm, temperature-measuring range is -200 DEG C~+450 DEG C, maximum measurement model
It encloses for 30kM.
It is worth noting that protection scope of the present invention is not limited to above-mentioned specific example mode, it is according to the present invention
Basic fundamental design, it is also possible to which the purpose of the present invention may be implemented in basically same structure, as long as those of ordinary skill in the art
Creative work is needed not move through, the embodiment that can be associated all belongs to the scope of protection of the present invention.
Claims (10)
1. a kind of tractive power supply system 27.5kV high-tension cable on-line condition monitoring method, which is characterized in that include the following steps,
A. laser pulse signal transmitter sends out the multimode temperature measuring optical cable being embedded in tractive power supply system 27.5kV high-tension cable
Penetrate laser pulse signal；
B. the initial power P of incident laser pulse signal is recorded0, frequency υυWith t at the time of transmitting incident light0, and transmit it to
Central processing unit in optical fiber temperature measurement host；
C. the back wave that is generated by Raman scattering effect of photoelectric signal collection device acquisition multimode temperature-measuring optical fiber, and by the anti-of acquisition
Ejected wave frequency and power transmission are to central processing unit；
D. central processing unit calculated rate difference Iv, stokes light power Ps, frequency υsWith anti-Stokes light power Pa；
E. the temperature value and distance value at L are calculated；
F. the high-tension cable temperature value each measurement point real-time monitored with preset compared with alarm threshold value；Greater than warning level
The alarm signal of appropriate level is issued when value.
2. tractive power supply system 27.5kV high-tension cable on-line condition monitoring method according to claim 1, feature exist
In the Si Tuo that each measurement point is generated due to Raman scattering in the step C photoelectric signal collection device acquisition multimode temperature-measuring optical fiber
Ke Si light and anti-Stokes light, enabling the temperature at optical fiber temperature measurement host L is T, then photoelectric signal collection device acquires at this time
The stokes light power P generated at L3, frequency υ3With anti-Stokes light power Pa, frequency υa, and arrive photoelectric gathering apparatus
Time is tL。
3. tractive power supply system 27.5kV high-tension cable on-line condition monitoring method according to claim 1, feature exist
In the step D central processing unit is according to incident light frequency υ0, the frequency υ of the stokes light of acquisitions, anti-Stokes light
Frequency υa, calculated rate difference Δv, and obtain Ps, PaExpression formula；
Δ v=υa-υ0=υ0-υs (1)
Wherein T is thermodynamic temperature, Ks、KaIt is the related coefficient of stokes light and anti-Stokes light scattering interface, S respectivelyb
For the coefficient of backscattering, α0、αs、αaIt is that incident light, stokes light and anti-Stokes light scatter light in a fiber respectively
Transmission loss, h are planck constant；K is Boltzmann's constant；Rs(T)、Ra(T) be respectively in temperature T, stokes light and
Anti-Stokes light coefficient related with optical fiber molecular entergy level i on population.
4. tractive power supply system 27.5kV high-tension cable on-line condition monitoring method according to claim 1, feature exist
In, the step D by anti-Stokes light power PaWith stokes light power PsIt compares, can obtain at optical fiber temperature measurement host L
The expression formula of temperature T.
。
5. tractive power supply system 27.5kV high-tension cable on-line condition monitoring method according to claim 1, feature exist
In, the step E by the expression formula of temperature T at optical fiber temperature measurement host L and the preset fiducial temperature T of system0Compared to can obtain
To the occurrence of temperature T；
The distance value at thermometric host L that can be asked according to optical time domain reflection effect.
L=(c* (tL-t0))*IOR/2 (9)
Wherein L is distance of the measurement point apart from photosignal transmitter, and c is the light velocity in vacuum, ΔtLight pulse signal transmitting with
Back-scattering light arrives at the time difference of photoelectric signal collection device, and IOR is optical fibre refractivity.
6. tractive power supply system 27.5kV high-tension cable on-line condition monitoring method according to claim 1, feature exist
In it is each that central processing unit processing as processing L measurement point is distributed in 27.5kV high-tension cable measured on optical fiber
The temperature of point and position.
7. realizing the monitoring dress of tractive power supply system 27.5kV high-tension cable on-line condition monitoring method described in claim 1
It sets, which is characterized in that including the multimode temperature-measuring optical fiber (1) being installed in 27.5kV high-tension cable, the multimode temperature-measuring optical fiber (1)
By E2000,8 ° of inclination angle flanges are connected with optical fiber temperature measurement host (2).
8. the monitoring of tractive power supply system 27.5kV high-tension cable on-line condition monitoring method according to claim 7 fills
Set, which is characterized in that the optical fiber temperature measurement host (2) include laser pulse signal transmitter (3), photoelectric signal collection device (4),
Central processing unit (5) and display (6)；The laser pulse signal transmitter (3) is prolonged to multimode temperature-measuring optical fiber (1) transmitting 10ns
When laser pulse, and by incident light frequency and power trace to central processing unit (5)；Photoelectric signal collection device (4) acquisition
The back wave that multimode temperature-measuring optical fiber (1) is generated by Raman scattering effect, and extremely by the reflection wave frequency of acquisition and power transmission
Central processing unit (5)；By display (6) by temperature curve real-time display after central processing unit (5) processing, and certainly by synthesis
Dynamicization system (7) is uploaded to scheduling duty room (8).
9. the monitoring of tractive power supply system 27.5kV high-tension cable on-line condition monitoring method according to claim 7 fills
It sets, which is characterized in that the multimode temperature-measuring optical fiber (1) is two core 62.5/125um, and multimode temperature-measuring optical fiber (1) oversheath is low cigarette
Halogen-free flame-retardant thermoplastics type.
10. the monitoring of tractive power supply system 27.5kV high-tension cable on-line condition monitoring method according to claim 7 fills
It sets, which is characterized in that multimode temperature-measuring optical fiber (1) fiber attenuation coefficient is less than or equal to 0.8dB/km, and bandwidth is more than or equal to
500MHz/km, numerical aperture are 0.2 ± 0.015NA, and core diameter is 62.5 ± 3 μm, and cladding diameter is 125 ± 2 μm, maximum pull
For 2000N, Maximal compression force 400N/cm, temperature-measuring range is -200 DEG C~+450 DEG C, and maximum measurement range is 30kM.
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| CN201910290822.0A CN109904932B (en) | 2019-04-11 | On-line state monitoring method and monitoring device for 27.5kV high-voltage cable of traction power supply system |
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| CN201910290822.0A CN109904932B (en) | 2019-04-11 | On-line state monitoring method and monitoring device for 27.5kV high-voltage cable of traction power supply system |
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| CN111596168A (en) * | 2020-05-22 | 2020-08-28 | 中国矿业大学 | Fault positioning method based on GIL distribution thermal characteristic difference |
| CN114184896A (en) * | 2021-11-15 | 2022-03-15 | 昆明理工大学 | Single-ended fault location method and system for hybrid direct-current transmission line |
| CN114894340A (en) * | 2022-05-31 | 2022-08-12 | 国网安徽省电力有限公司安庆供电公司 | Power transmission cable multiplexing distributed temperature sensing method based on Internet of things |
| CN116879683A (en) * | 2023-09-04 | 2023-10-13 | 湖南华菱线缆股份有限公司 | Method and device for identifying local defects of high-voltage power cable |
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| CN116879683A (en) * | 2023-09-04 | 2023-10-13 | 湖南华菱线缆股份有限公司 | Method and device for identifying local defects of high-voltage power cable |
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