CN204008979U - The early warning of power cable insulation On-line Fault and positioning system - Google Patents
The early warning of power cable insulation On-line Fault and positioning system Download PDFInfo
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- CN204008979U CN204008979U CN201420433467.0U CN201420433467U CN204008979U CN 204008979 U CN204008979 U CN 204008979U CN 201420433467 U CN201420433467 U CN 201420433467U CN 204008979 U CN204008979 U CN 204008979U
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- 238000009413 insulation Methods 0.000 title claims abstract description 26
- 238000012544 monitoring process Methods 0.000 claims abstract description 19
- 238000004891 communication Methods 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000004807 localization Effects 0.000 claims description 5
- 206010003402 Arthropod sting Diseases 0.000 claims description 3
- 238000001028 reflection method Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 13
- 230000001052 transient effect Effects 0.000 abstract description 10
- 238000012545 processing Methods 0.000 abstract description 3
- 240000005572 Syzygium cordatum Species 0.000 description 4
- 235000006650 Syzygium cordatum Nutrition 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 2
- 239000004703 cross-linked polyethylene Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000010223 real-time analysis Methods 0.000 description 1
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- Locating Faults (AREA)
Abstract
The utility model discloses the early warning of a kind of power cable insulation On-line Fault and positioning system, comprise wave reflection fault locating instrument, GPRS communication module, high frequency sensors, ground wire, host computer and display.The utility model is simple in structure, use safety, by the ground current signal on the ground wire of contactless high frequency sensors monitoring power cable, and then the insulation fault of monitoring power cable, simultaneously by high frequency sensors and wave reflection fault locating instrument are set on every section of power cable, only have when wave reflection fault locating instrument monitors the capable ripple of high frequency transient and just by GPRS communication module, send a signal to host computer, reduced the signal processing pressure of host computer.The utility model Real-Time Monitoring power cable operation conditions, and set early warning information according to the electric signal number of times monitoring, contribute to electric power overhaul personnel to carry out in advance maintenance and prepare or arrive maintenance position to shorten the repair time.
Description
Technical field
The utility model belongs to power cable fault detection technique field, is specifically related to the early warning of a kind of power cable insulation On-line Fault and positioning system.
Background technology
The advantages such as crosslinked polyethylene (XLPE) power cable is with its superior electric, heat and mechanical property and lay easily, operation maintenance is simple are applied more and more widely, and become the main flow of cable development.But a large amount of operations of electric power enterprise Ji Yong electrician factory are put into practice and are shown, cross-inked polyethylene power cable is not non-maintaining.Common cable fault mainly comprises: 1) medial head is made the external causes such as quality is bad, crimp head is not tight, contact resistance is excessive, external impacts, and the cable head temperature that cable long-time running causes raises, cause that cable is overheated burns insulation, this type of fault generally can be by finding in maintainer's maintenance repair work; 2) cable insulation punctures, the accidents such as fault, earth fault are short-circuited, cause the accidents such as power failure, fire, this type of fault is generally difficult for checking, because cable itself is very long, and often because certain defect causes, this class fault can not be predicted, after the accident of often can only waiting until occurs, inspection circuit just can be known particular location, and not only the time-consuming circuit that also affects is rushed to repair the time.At present detection streamer fault comprises bridge method and wave reflection localization method, but mainly for cable factory testing, and is designed to the pick-up unit of hand-held, can not meet the needs of power cable insulation On-line Fault monitoring.
Summary of the invention
The utility model is for the deficiency of cable outgoing detector, the early warning of a kind of power cable insulation On-line Fault and positioning system are provided, can be real-time, multi-line is concentrated monitoring power cable wire condition, and according to Monitoring Data, warning and pre-aligned is in advance proposed, facilitate the timely localization of faults, easy access personnel carry out power cable line maintenance.
The utility model solves the problems of the technologies described above by the following technical programs:
The early warning of power cable insulation On-line Fault and a positioning system, comprise wave reflection fault locating instrument, GPRS communication module, high frequency sensors, ground wire, host computer and display, it is characterized in that:
Ground wire, the metal sheath that power cable carries, the direct ground connection in one end, other end gap ground connection;
High frequency sensors, adopts open stich mode, sees through coil and hangs on the ground wire of every section of power cable;
Wave reflection fault locating instrument, connects high frequency sensors by signal wire, the electric signal record that high frequency sensors is received, and carry out localization of fault;
GPRS communication module, sends by wireless signal the electrical signal data of wave reflection fault locating instrument record and the locator data of trouble spot to host computer;
Host computer, receives the electrical signal data of GPRS communication module transmission and the locator data of trouble spot;
Display, shows the electric signal figure of host computer reception and the locator data of trouble spot.
In order to obtain better technique effect, described wave reflection fault locating instrument is HDTDR-80 wave reflection method cable fault locator, PMDJ-102A cable termination or TWPD-2622 Digital PD Detector; Also comprise counter, record respectively the electric signal number of times that the wave reflection fault locating instrument of every section of power cable monitors, and send corresponding early warning information according to the electric signal number of times of monitoring in setting-up time section; Alarm, the early warning signal that receives counter transmission sends alarm.
The utility model is simple in structure, use safety, by the ground current signal on the ground wire of contactless high frequency sensors monitoring power cable, and then the insulation fault of monitoring power cable, simultaneously by high frequency sensors and wave reflection fault locating instrument are set on every section of power cable, only have when wave reflection fault locating instrument monitors the capable ripple of high frequency transient and just by GPRS communication module, send a signal to host computer, reduced the signal processing pressure of host computer.The utility model Real-Time Monitoring power cable operation conditions, and set early warning information according to the electric signal number of times monitoring, contribute to electric power overhaul personnel to carry out in advance maintenance and prepare or arrive maintenance position to shorten the repair time.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation;
Structural representation when Fig. 2 is the utility model power cable fault.
Embodiment
Below in conjunction with drawings and Examples, further explain content of the present utility model.
The early warning of power cable insulation On-line Fault and a positioning system, comprise wave reflection fault locating instrument 4, GPRS communication module 5, high frequency sensors 3, ground wire 2, host computer, display, counter and alarm,
Ground wire 2, the metal sheath that the every section of power cable 1 on transmission line of electricity is carried is as ground wire 2, the direct ground connection in its one end, other end gap ground connection;
High frequency sensors 3, adopts open stich mode, sees through coil and hangs on the ground wire 2 of every section of power cable 1;
Wave reflection fault locating instrument 4, arranges a wave reflection fault locating instrument 4 at every section of power cable 1, by signal wire, connects corresponding high frequency sensors 3, and the electric signal that high frequency sensors 3 receives preserved in record, and carry out localization of fault;
GPRS communication module 5, sends by wireless signal the electrical signal data of wave reflection fault locating instrument 4 records and the locator data of trouble spot to host computer;
Host computer, receives the electrical signal data of GPRS communication module 5 transmissions and the locator data of trouble spot;
Display, shows the electric signal figure of host computer reception and the locator data of trouble spot;
Counter, records respectively the electric signal number of times that the wave reflection fault locating instrument 4 of every section of power cable 1 monitors, and sends corresponding early warning information according to the electric signal number of times of monitoring in setting-up time section;
Alarm, the early warning signal that receives counter transmission sends alarm.
As optimization, wave reflection fault locating instrument 4 is HDTDR-80 wave reflection method cable fault locator, PMDJ-102A cable termination or TWPD-2622 Digital PD Detector.
The metal sheath of single-core power cables adopts the direct ground connection in one end, the other end through protection gap earthing mode conventionally.Cable is under normal operation, and the stable state ground current of its metal sheath is minimum, is mainly capacity current.If the three-phase heart yearn voltage of single core cable under normal operation is respectively
load current is respectively
the A of take is example mutually, and the stable state ground current of its metal sheath under normal operation can be expressed as:
In formula: C be every phase cable core with this phase metal sheath between equivalent capacity.
When cable, in X place, metal sheath insulation fault has occurred, make the resistance to earth at X place become one from infinity and there is resistance value R
eresistance 6, as shown in Figure 2.
The current potential of getting cable sheath earth point G is reference potential, and trouble spot X forms current path by the earth and G.Sheath stable state ground wire electric current can be expressed as:
In formula: M
aAfor the coefficient of mutual inductance of cable core for A-X-Re-G loop; L is that sheath trouble spot is to the equivalent inductance of earth terminal.
Comparison expression (1) and formula (2) can find, while breaking down, the ground current that cable metal sheath produces is many increments during than stable state, and this increment is transient state ground current.
By high frequency sensors 3, receive transient state ground current signal, and add up transient state ground current frequency, power cable insulation fault is carried out to early warning, according to our production practices, early warning is divided into three kinds, and 1) yellow early warning: after cable occurs extremely, the utility model collects transient current signal and occurs with yellow alert status within the very first time, represent that this power cable has arcing phenomenon, should pay close attention to; 2) orange early warning: when detect tens transient current signals every day, the utility model is reported to the police in the mode of orange early warning, reminds maintainer's reasonable arrangement maintenance as early as possible; 3) red early warning: when transient current signal frequency is more and more faster, power cable will soon break down, and reminding user should carry out interruption maintenance at once.
When daily power cable line is patrolled and examined work, when patrol officer checks power cable line, only need to check emphatically the jointing of every section of power cable, avoid joint to make the external faults such as quality is bad, crimp head is not tight, contact resistance is excessive, external impacts, the defect of corresponding power cable own is monitored by the On-line Fault early warning of the utility model power cable insulation and positioning system.High frequency sensors 3 is set on the ground wire of every section of power cable, and be connected with wave reflection fault locating instrument 4 by signal wire, wave reflection fault locating instrument 4 regularly sends working signal to host computer by GPRS communication module 5, confirms that wave reflection fault locating instrument 4 is in running order.
While there is defect, micropore and moisture in cable major insulation, due to the electric field distortion at defect or micropore place, under the effect of electric field, there is water-treeing phenomenon.Follow water tree growth, the electric field at water tree tip will be further concentrated, and local high electric field intensity finally can cause the most advanced and sophisticated generation of water tree electric branch, thereby causes cable major insulation to puncture.When water tree causes that cable major insulation punctures, will produce arc phenomenon, and aqueous vapor evaporation is dried, thereby cable major insulation return to again the level that can tolerate normal working voltage after arc extinction.
The utility model reminds monitor staff to note line security according to above-mentioned alarm mode, and arranges maintenance job early.
The utility model is simple in structure, use safety, by the ground current signal on the ground wire of contactless high frequency sensors monitoring power cable, and then the insulation fault of monitoring power cable, simultaneously by high frequency sensors and wave reflection fault locating instrument are set on every section of power cable, only have when wave reflection fault locating instrument monitors the capable ripple of high frequency transient and just by GPRS communication module, send a signal to host computer, reduced the signal processing pressure of host computer.The utility model Real-Time Monitoring power cable operation conditions, and set early warning information according to the electric signal number of times monitoring, contribute to electric power overhaul personnel to carry out in advance maintenance and prepare or arrive maintenance position to shorten the repair time.The utility model passes through the high-voltage cable insulating status monitoring under working voltage, the Steady state and transient state feature of real-time analysis power cable ground connection sensor current signal, judge the variation tendency of state of insulation, from variation tendency, need to look for dangerous sign, from testing result, comprehensively judge cable operation conditions, find in advance insulation fault hidden danger the early warning in time of power cable, can accurately locate position, trouble spot error range 2m left and right, greatly improved the efficiency of maintenance.
Claims (4)
1. the early warning of power cable insulation On-line Fault and a positioning system, comprise wave reflection fault locating instrument, GPRS communication module, high frequency sensors, ground wire, host computer and display, it is characterized in that:
Ground wire, the metal sheath that power cable carries, the direct ground connection in one end, other end gap ground connection;
High frequency sensors, adopts open stich mode, sees through coil and hangs on the ground wire of every section of power cable;
Wave reflection fault locating instrument, connects high frequency sensors by signal wire, the electric signal record that high frequency sensors is received, and carry out localization of fault;
GPRS communication module, sends by wireless signal the electrical signal data of wave reflection fault locating instrument record and the locator data of trouble spot to host computer;
Host computer, receives the electrical signal data of GPRS communication module transmission and the locator data of trouble spot;
Display, shows the electric signal figure of host computer reception and the locator data of trouble spot.
2. power cable insulation On-line Fault as claimed in claim 1 early warning and positioning system, it is characterized in that, described wave reflection fault locating instrument is HDTDR-80 wave reflection method cable fault locator, PMDJ-102A cable termination or TWPD-2622 Digital PD Detector.
3. power cable insulation On-line Fault as claimed in claim 1 or 2 early warning and positioning system, it is characterized in that, also comprise counter, record respectively the electric signal number of times that the wave reflection fault locating instrument of every section of power cable monitors, and send corresponding early warning information according to the electric signal number of times of monitoring in setting-up time section.
4. power cable insulation On-line Fault as claimed in claim 3 early warning and positioning system, is characterized in that, also comprises alarm, and the early warning signal that receives counter transmission sends alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420433467.0U CN204008979U (en) | 2014-08-03 | 2014-08-03 | The early warning of power cable insulation On-line Fault and positioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420433467.0U CN204008979U (en) | 2014-08-03 | 2014-08-03 | The early warning of power cable insulation On-line Fault and positioning system |
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| CN204008979U true CN204008979U (en) | 2014-12-10 |
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| CN201420433467.0U Expired - Fee Related CN204008979U (en) | 2014-08-03 | 2014-08-03 | The early warning of power cable insulation On-line Fault and positioning system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629136A (en) * | 2015-12-28 | 2016-06-01 | 国网甘肃省电力公司金昌供电公司 | Cable insulation state online automatic monitoring and diagnosis system |
| US10091164B2 (en) | 2015-07-06 | 2018-10-02 | Regal Beloit America, Inc. | System and method for mapping physical locations of motors in a network |
| CN109738138A (en) * | 2019-01-31 | 2019-05-10 | 河北工程大学 | A kind of method and system using traveling wave positioning HDPE film leak location |
-
2014
- 2014-08-03 CN CN201420433467.0U patent/CN204008979U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10091164B2 (en) | 2015-07-06 | 2018-10-02 | Regal Beloit America, Inc. | System and method for mapping physical locations of motors in a network |
| CN105629136A (en) * | 2015-12-28 | 2016-06-01 | 国网甘肃省电力公司金昌供电公司 | Cable insulation state online automatic monitoring and diagnosis system |
| CN105629136B (en) * | 2015-12-28 | 2019-02-26 | 国网甘肃省电力公司金昌供电公司 | Cable insulation status online auto monitoring and diagnostic system |
| CN109738138A (en) * | 2019-01-31 | 2019-05-10 | 河北工程大学 | A kind of method and system using traveling wave positioning HDPE film leak location |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20160803 |