CN201681137U - Cross-linked polyethylene power cable failure online early warning device - Google Patents
Cross-linked polyethylene power cable failure online early warning device Download PDFInfo
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- CN201681137U CN201681137U CN2010201797066U CN201020179706U CN201681137U CN 201681137 U CN201681137 U CN 201681137U CN 2010201797066 U CN2010201797066 U CN 2010201797066U CN 201020179706 U CN201020179706 U CN 201020179706U CN 201681137 U CN201681137 U CN 201681137U
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Abstract
A cross-linked polyethylene power cable failure online early warning device belongs to the field of power cable online monitoring, comprises a tested cross-linked polyethylene power cable, a casing and a power unit, and is characterized in that a high-speed signal acquisition and processing system is disposed inside the casing, a high-frequency sensor is arranged in a metal shield layer grounding layer of the tested cross-linked polyethylene power cable, an output end of the high-frequency sensor is connected with an input end of the high-speed signal acquisition and processing system, and an output end of the power unit is connected with a power port of the high-speed signal acquisition and processing system. The system early warns against 'recoverable failures' before cable damage, facilitates advanced or planed maintenance for power supply departments, avoids power failure caused by cable accidental failure, reduces economical loss and adverse affection on enterprise production and people's life due to power failure, and increases reliability of power supply.
Description
Technical field
The utility model belongs to power cable on-line monitoring field, and the power cable of being monitored is crosslinked polyethylene (XLPE) power cable of each electric pressure of moving in the small current system, is a kind of online prior-warning device of failure of cross-linked polyethylene power cable specifically.
Background technology
The cable that is used for electric power transfer and distribution is called power cable.Along with the progress of society and the development of industrial and agricultural production, cable consumption shared ratio in whole power transmission lines improves day by day, and cable is compared with overhead transmission line, has following major advantage:
1. send electric reliability height, be not subject to the influence of surrounding environment and pollution;
2. insulation distance is little between line, takes up an area of to lack noiseless electric wave;
3. during underground laying, do not take up an area of face and space, both safe and reliable, be difficult for again giving away one's position.
The application of power cable insulation online measuring technique is to realize one of effective means of repair based on condition of component, and online early warning is that the running status to cable detects under working voltage, actual response the cable insulation level.Under automatic continuous detecting state, can judge the state of insulation variation tendency according to the digital-to-analogue analysis of lot of data and criterion, from variation tendency, seek dangerous sign, comprehensively judge the cable operation conditions from testing result.And utilize mechanics of communication to carry in real time that inspection declaration is repaiied and the related personnel, promptly reach scheduled overhaul before the accident, avoid accident to enlarge and unnecessary economic loss.
In actual applications, characteristics at crosslinked polyethylene (XLPE) cable, several traditional detection methods below normal the employing realize the online detection of cable insulation: the DC component method, several methods such as loss current harmonic component method and local electric discharge, the concrete condition that advantage is separately all arranged and be suitable for.Do a brief introduction with regard to several method below:
1, DC component method
The DC component method is that people such as K.Sona analyzes the method that the back proposes to the cable of actual motion, because the water tree in crosslinked polyethylene (XLPE) cable plays " rectified action ", so negative half period at applied voltage, the water tree discharge has been injected more negative charge in insulation, and the positive charge that injects when positive half cycle is less, merely hit and a part of negative charge.Execute so outside under the effect repeatedly of positive-negative half-cycle of working volts alternating current, the negative charge that the water tree front end is assembled drifts about to screen layer gradually, just as DC component has appearred in rectified action, can be by measuring the development that DC component detects the water tree of crosslinked polyethylene (XLPE).See that in actual field ruuning situation this DC component numerical value is minimum, only several sometimes peaces of receiving.So when carrying out the measurement of DC component at the scene, small interference current will cause very big error, and this error is mainly from the screen layer of tested cable and the stray current between the earth.
2, loss current harmonic component method
The harmonic component ratio juris is to cause that according to water tree aging crosslinked polyethylene (XLPE) power cable can produce the insulation status that harmonic component is come detection streamer in loss current.Studies show that, under the aging situation of water tree, the electricity of insulation is led and can be presented nonlinear characteristic, under the sinusoidal voltage effect, harmonic component will appear in loss current, so harmonic component can be good at characterizing the aging conditions of cable, along with the increase of cable degree of aging, loss current can more and more distort, and the harmonic component that contains is also increasing.Utilize the harmonic component of detected loss current that the ageing information of more water tree just can be provided, for the monitoring of cable insulation situation provides a kind of alternative method.But the method exists difficult to distinguish the shortcoming of capacitance current component and loss current component.
3, detect the shelf depreciation method
Shelf depreciation is that phenomenon is repeated to puncture and extinguish in the inner part that takes place of crosslinked polyethylene (XLPE) power cable insulation medium, one occurs in the local defect place of cable this discharge, discharge capacity very little (several pC～tens pC), the insulating capacity that can not influence power cable at the discharge initial stage substantially then can, if but this discharge takes place for a long time, cable life is shortened in the insulation of damage cable gradually.Because during shelf depreciation, the insulation resistance of cable, dielectric loss and Leakage Current do not have too big variation, therefore these phenomenons just office of can be used as put, and detect above parameter and can't judge shelf depreciation.But when shelf depreciation took place in insulation, one all can produce phenomenons such as electric pulse, electromagnetic wave radiation, light, heat, sound, noise, the object of detection.According to the difference that detects physical quantity, its method has: partial discharge quantity method, pulse current detection method, electromagnetic wave method, supercritical ultrasonics technology and vibration acceleration method.Wherein the sensitivity of pulse current method is the highest, and can record discharge capacity, discharge repetition rate and average current.But the research for the shelf depreciation of the power cable of crosslinked polyethylene (XLPE) operation does not reach practicability at present, and for the damage degree and the evolution of insulating medium, does not also have qualitative and quantitative understanding.For the operation cable, owing to reasons such as grid disturbances, shelf depreciation does not have reliable foundation to the analysis of cable insulation degradation.So Partial Discharge Detection equipment can't be realized the on-line monitoring mode of power cable.
Publication No. is the Chinese patent of CN101464488 disclosed " a kind of on-line monitoring system for high voltage cable ", comprise sensor, data acquisition unit, electricity getting device, and the webserver, wherein sensor is arranged on the high-voltage cable joint place, be used to gather the data such as sheath circulating current, core electric current, cable surface temperature and ambient temperature and humidity of high-voltage cable joint and the data of gathering are sent to data acquisition unit, data acquisition unit is arranged near the high-voltage cable joint, is used for the data of pick-up transducers and sends to the webserver by wireless network.Its ultimate principle is the data such as sheath circulating current, core electric current, cable surface temperature and ambient temperature and humidity of gathering the high-voltage cable joint place, and judges by the size that compares sheath circulating current and core electric current whether insulating sheath occurs unusually.This method is to utilize the on-line monitoring of cable method of steady-state quantity, is suitable for the monitoring of the permanent insulation decline of cable fault.
Publication No. is the Chinese patent of CN101533062 disclosed " based on the power cable on-line insulation monitoring method of traveling wave electric amount measurement ", comprise: gather the traveling wave electric amount that measures on all cable lines that connect on the same bus of transformer station in real time, monitor simultaneously whether disturbance has taken place on all cable lines; When monitoring disturbance takes place on the cable line, record disturbance time of origin; And the capable wave characteristic on all cable lines relatively, determine the cable line that produces disturbance; Whether the cable of more nearest three disturbances is same cable; If same cable calculates and the time of disturbance takes place for the first time and take place the disturbance time interval for the third time; The more described time interval that calculates and pre-set time interval reduce output cable on-line monitoring result if the described time interval that calculates, is then judged this cable insulation smaller or equal to described pre-set time interval.The technological core of this method is to gather the traveling wave electric amount that measures on all cable lines that connect on the same bus of transformer station simultaneously in real time, monitor simultaneously whether disturbance has taken place on all cable lines, otherwise, if there wherein have a cable not have to be monitored, then just can't carry out follow-up determination step; In addition, the utility model is applicable to that cable insulation reduces the fault detect of the row of the disturbance clocklike ripple that causes.
In sum, for crosslinked polyethylene (XLPE) power cable, the conventional online detection method all has limitation separately.
Through us research and experiment discovery, crosslinked polyethylene (XLPE) power cable of normal operation is owing to can produce water tree under the effect of factors such as the mechanical damage hydrone in running environment in manufacturing defect or the laid processes, and water tree is grown gradually under effect of electric field, forming conductive channel also punctures, the energy that punctures makes conductive channel melt obstruction or hydrone is dispersed, this passage is insulation recovery under the reversed electric field effect, and we claim this punch-through to be " can recover fault ".As time goes on, this process can constantly be strengthened, and punctures frequency and also improves gradually, connects irrecoverablely fully up to this conductive channel, shows as crosslinked polyethylene (XLPE) power cable generation singlephase earth fault.Therefore,, implement online early warning, have important practical significance " can recover fault " before the cable damage.
For the crosslinked polyethylene that moves in the small current neutral grounding system (XLPE) power cable, the disruptive discharge amount of above-mentioned " can recover fault " is at tens to the tens microcoulomb orders of magnitude, duration is less than 2 milliseconds, and the intensity of the transient electromagnetic transient signal of its generation and waveform morphology obviously are different from the electro-magnetic transient signal that shelf depreciation or grid disturbance produce.
The utility model content
According to above deficiency of the prior art, it is a kind of at " can recover fault " before the power cable damage that the purpose of this utility model is to provide, implement online early warning, being convenient to power supply department shifts to an earlier date or planned maintenance, avoid causing power failure because of the cable catastrophic failure, the economic loss that minimizing is caused because of having a power failure and to the adverse effect that enterprise produces and people's lives are brought, the online prior-warning device of the failure of cross-linked polyethylene power cable of raising power supply reliability.
The technical scheme that its technical matters that solves the utility model adopts is: the online prior-warning device of failure of cross-linked polyethylene power cable, comprise tested cross-inked polyethylene power cable, housing and power supply unit, it is characterized in that: high-speed signal acquisition and disposal system are set in the housing, metal screen layer earth conductor at tested cross-inked polyethylene power cable is provided with high frequency sensors, the output terminal of high frequency sensors connects the input end of high-speed signal acquisition and disposal system, and the output terminal of power supply unit connects the power port of high-speed signal acquisition and disposal system.
High-speed signal acquisition and disposal system comprise signal conditioner, high-speed a/d converter, high-speed comparator, FPGA, dynamic storage and processor, the output terminal of high frequency sensors connects the input end of signal conditioner, the output terminal of signal conditioner is connected the signal input part of FPGA respectively with high-speed comparator by high-speed a/d converter, the data terminal of FPGA is provided with connected storage, the data terminal of its output terminal connection processing device.
The cutoff frequency that is collected by high frequency sensors is greater than the electro-magnetic transient signal of 2MHz, gain through signal conditioner and to adjust and low-pass filtering is given high-speed a/d converter and high-speed comparator, whether the output decision according to high-speed comparator under the control of FPGA (field programmable gate battle array) starts high speed analog-to-digital conversion and storage, processor carries out algorithm process by interrupting obtaining the data effective information.
Wherein preferred version is:
The communication terminal of described processor connects network by Ethernet chip.By Ethernet data are uploaded to host computer with network communication mode.The user can also compile by network, single calling except monitoring running status on unit, analyzes and handles.
The output terminal of described processor is provided with display and hummer.Reading of data and reminding alarm intuitively.
The beneficial effect that online prior-warning device had of the utility model failure of cross-linked polyethylene power cable is: by the metal screen layer earth conductor at tested cross-inked polyethylene power cable high frequency sensors is set, the output terminal of high frequency sensors connects the input end of high-speed signal acquisition and disposal system, can:
1, can realize the online fault pre-alarming of crosslinked polyethylene (XLPE) power cable;
2, do not change the cable method of operation and structure, do not take the existing system resource, on cable metal shielding layer grounding conductor, High Frequency Current Sensor is installed, safe and reliable;
3, can online detection one or more power cable, mandatory requirement is not all installed online detection instrument on all power cables that connect the same bus of transformer station, mandatory requirement does not detect the electro-magnetic transient signal of all power cables simultaneously, so system configuration is flexible;
4, realize the power cable fault early warning, being convenient to power supply department shifts to an earlier date or planned maintenance, avoid because of the cable catastrophic failure causes power failure, reduce the economic loss that caused because of having a power failure and, the raising power supply reliability the adverse effect that enterprise produces and people's lives are brought.
Description of drawings
Fig. 1 is used for the online early warning electrical schematic diagram of crosslinked polyethylene (XLPE) power cable of small current system for the utility model;
Fig. 2 is the functional-block diagram of high-speed signal acquisition of the present utility model and data handling system;
Fig. 3 is the inside functional-block diagram of FPGA embodiment among Fig. 2;
The original waveform (on April 6th, 2010) that crosslinked polyethylene (XLPE) power cable that Fig. 4 obtains for the on-the-spot on-line operation of the utility model embodiment " can recover fault ";
Crosslinked polyethylene (XLPE) the power cable actual measurement disturbance original waveform (on April 6th, 2010) that Fig. 5 obtains for the on-the-spot on-line operation of the utility model embodiment;
Among the figure: 1. High Frequency Current Sensor 2. online prior-warning device 3. metal screen layer earth conductors, 4. crosslinked polyethylenes (XLPE) power cables 5. earth points 6. buses 7. transformers 8. power supplys 9. switches 10. arc suppression coils 11. loads 12. earth points.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further:
As shown in Figure 1, a normal crosslinked polyethylene (XLPE) power cable power supply model is formed in power supply 8, transformer 7, switch 9, arc suppression coil 10, bus 6, crosslinked polyethylene (XLPE) power cable 4 and load 11.Crosslinked polyethylene (XLPE) power cable 4 is provided with earth point 5,12.Earth-free or on crosslinked polyethylene (XLPE) power cable 4 of the operation of power networks of grounding through arc, insert a High Frequency Current Sensor 1, the metal screen layer of crosslinked polyethylene (XLPE) power cable 4 or the metal screen layer earth conductor 3 of steel armour pass this High Frequency Current Sensor 1, the output terminal of this High Frequency Current Sensor 1 receives 2, and this online prior-warning device 2 is made of ultra high speed signal collection and data handling system etc.
As Fig. 2, shown in Figure 3, high-speed signal acquisition and disposal system mainly comprise high frequency sensors, signal conditioner, high-speed a/d converter, high-speed comparator, FPGA, dynamic storage, processor, Ethernet chip and network.The output terminal of high frequency sensors connects the input end of signal conditioner, and the output terminal of signal conditioner is connected the signal input part of FPGA respectively with high-speed comparator by high-speed a/d converter.The data terminal of FPGA is provided with connected storage, the data terminal of its output terminal connection processing device.The communication terminal of processor connects network by Ethernet chip.
The output terminal of processor is provided with display and printer, also printer, colour band, pilot lamp or loudspeaker can be set.
FPGA is the FPGA (Field Programmable Gate Array) gate array, comprises high-speed a/d interface, threshold logic control, dynamic RAM interface, command register and processor interface, and its modular structure mode is common prior art.During use, the high-speed a/d interface connects the output terminal of high-speed a/d converter, threshold logic control linkage high-speed comparator, and dynamic memory interface (DMI) connects dynamic storage DRAM, the input end of processor interface connection processing device.
The processor of mentioning in the utility model and the setting of FPGA, input, storage and use, the professional is grasped by common computer.
Principle of work and use:
The cutoff frequency that is collected by high frequency sensors is greater than the electro-magnetic transient signal of 2MHz, gain through signal conditioning circuit and to adjust and low-pass filtering is given high-speed a/d converter and high-speed comparator, whether the output decision according to high-speed comparator starts high speed analog-to-digital conversion and storage under the control of FPGA (Field Programmable Gate Array) gate array at the scene, processor is by interrupting obtaining the data effective information, through algorithm process, data are uploaded to host computer with network communication mode by Ethernet.The user can also compile by network, single calling except monitoring running status on unit, analyzes and handles.
When detecting and writing down a certain tested crosslinked polyethylene (XLPE) power cable " can recover fault " takes place by real-time online, the transient electromagnetic transient signal of the metal screen layer earth conductor of the described tested power cable of flowing through that produces, utilization continuous detecting in breaking down this time period to power cable the generation first time " can recover fault " with the described tested power cable that records the number of times of " can recover fault " takes place and the intensity and the form of described transient electromagnetic transient signal analyzed as certain criteria, described tested power cable is carried out fault pre-alarming, comprises following concrete steps:
Step 1: the metal screen layer earth conductor of described tested crosslinked polyethylene (XLPE) power cable is passed a pass High Frequency Current Sensor, the output terminal of this High Frequency Current Sensor is received a high-speed signal acquisition and data handling system, and this high-speed signal acquisition and disposal system comprise at least one high-speed signal acquisition unit and data analysis and disposal system with certain criteria;
Step 2: utilize described High Frequency Current Sensor and high-speed signal acquisition unit, real-time online detects and writes down described tested power cable when " can recover fault " takes place, the transient electromagnetic transient signal of the metal screen layer earth conductor of the described tested power cable of flowing through of generation;
Step 3: utilize described data analysis and disposal system, step 2 is detected and write down the signal data that obtains,
(1) carry out signal condition and analog to digital conversion, and storage;
(2) with intensity and the waveform morphology and the certain criteria comparison of transient electromagnetic transient signal, distinguish the misoperation signal takes place;
(3) by transient electromagnetic transient signal record the number of times of " can recover fault " takes place, if this number of times near certain criteria, then shows and reports to the police.
Step (2) and step (3) are manual observation, record and calculating, also can computer aided calculation improve judgement speed and accuracy rate.
As Fig. 4, shown in Figure 5, for original waveform and the utility model embodiment scene crosslinked polyethylene (XLPE) power cable that the on-line operation scene obtained on April 6th, 2010 that the utility model embodiment scene crosslinked polyethylene (XLPE) power cable that the on-line operation scene obtained on April 6th, 2010 " can recover fault " are surveyed the disturbance original waveform.
Can significantly distinguish the difference of distinguishing two kinds of waveforms, can effectively remove disturbing signal, improve the accuracy of monitoring and warning.
Claims (5)
1. the online prior-warning device of failure of cross-linked polyethylene power cable, comprise tested cross-inked polyethylene power cable, housing and power supply unit, it is characterized in that: high-speed signal acquisition and disposal system are set in the housing, metal screen layer earth conductor at tested cross-inked polyethylene power cable is provided with high frequency sensors, the output terminal of high frequency sensors connects the input end of high-speed signal acquisition and disposal system, and the output terminal of power supply unit connects the power port of high-speed signal acquisition and disposal system.
2. the online prior-warning device of failure of cross-linked polyethylene power cable according to claim 1, it is characterized in that: described high-speed signal acquisition and disposal system comprise signal conditioner, high-speed a/d converter, high-speed comparator, FPGA, dynamic storage and processor, the output terminal of high frequency sensors connects the input end of signal conditioner, the output terminal of signal conditioner is connected the signal input part of FPGA respectively with high-speed comparator by high-speed a/d converter, the data terminal of FPGA is provided with connected storage, the data terminal of its output terminal connection processing device.
3. the online prior-warning device of failure of cross-linked polyethylene power cable according to claim 2, it is characterized in that: the communication terminal of described processor connects network by Ethernet chip.
4. the online prior-warning device of failure of cross-linked polyethylene power cable according to claim 1, it is characterized in that: the output terminal of described processor is provided with display.
5. the online prior-warning device of failure of cross-linked polyethylene power cable according to claim 1, it is characterized in that: the output terminal of described processor is provided with hummer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010201797066U CN201681137U (en) | 2010-05-05 | 2010-05-05 | Cross-linked polyethylene power cable failure online early warning device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201797066U CN201681137U (en) | 2010-05-05 | 2010-05-05 | Cross-linked polyethylene power cable failure online early warning device |
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| CN201681137U true CN201681137U (en) | 2010-12-22 |
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| CN2010201797066U Expired - Fee Related CN201681137U (en) | 2010-05-05 | 2010-05-05 | Cross-linked polyethylene power cable failure online early warning device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576054A (en) * | 2013-10-15 | 2014-02-12 | 国家电网公司 | On-line fault early-warning method of XLPE power cable |
| CN109307817A (en) * | 2018-10-24 | 2019-02-05 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of cable electrification identifier and recognition methods |
-
2010
- 2010-05-05 CN CN2010201797066U patent/CN201681137U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576054A (en) * | 2013-10-15 | 2014-02-12 | 国家电网公司 | On-line fault early-warning method of XLPE power cable |
| CN109307817A (en) * | 2018-10-24 | 2019-02-05 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of cable electrification identifier and recognition methods |
| CN109307817B (en) * | 2018-10-24 | 2024-04-02 | 中国南方电网有限责任公司超高压输电公司柳州局 | Cable live identification instrument and identification method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101222 Termination date: 20150505 |
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