CN106353655A - Characteristic pulse generating device for power cable partial discharge double-ended location as well as system and method thereof - Google Patents
Characteristic pulse generating device for power cable partial discharge double-ended location as well as system and method thereof Download PDFInfo
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/10—Locating faults in cables, transmission lines, or networks by increasing destruction at fault, e.g. burning-in by using a pulse generator operating a special programme
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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Abstract
The invention provides a characteristic pulse generating device for power cable partial discharge double-ended location as well as a system and method thereof. Characteristic pulse rising edge, characteristic pulse width and characteristic pulse repetition frequency can be changed by regulating circuit parameters in a characteristic pulse generating unit. When a to-be-tested cable is longer, a measuring unit is placed at the near end of the to-be-tested cable, and a synchronizing unit is arranged at the far end of the to-be-tested cable; the measuring unit at the near end of the cable transmits Gauss characteristic pulse transmits the Gauss characteristic pulse to the far end of the cable through a cable by virtue of a first high-frequency current sensor, the synchronizing unit at the far end detects the Gauss characteristic pulse and then immediately reflects the same Gauss characteristic pulse by virtue of a second high-frequency current sensor, and a position of a partial discharge source is located by calculating partial discharge pulse time difference. A brand new solution is provided for long-distance power cable partial discharge location.
Description
[technical field]
The present invention relates to Electric Power Equipment Insulation detection technique and its application, more particularly to power cable shelf depreciation
Detection and positioning correlative technology field.
[background technology]
Accelerate with China's Development of China's Urbanization, in urban power distribution network, the installation of cable and usage amount are increasing.How true
Protect the safe operation of a large amount of cables, improve electrical network power supply reliability and become the outstanding problem of distribution network operation and management.In recent years
The distribution cable Partial Discharge Detection growing up and location technology, due to non-intruding, lossless, efficient the advantages of obtain people's
Extensive concern.
Patent of invention cn 104655995 a discloses a kind of power cable office and puts source both-end localization method, and measuring unit sets
Put in power cable near-end, triggering reflector element is arranged on power cable far-end, and Partial discharge signal reaches proximal measurement unit, simultaneously
Pulse signal is sent to transmitter module amplify and be sent to cable by another one high frequency cable transformer, and is transferred to survey
Source is put in amount end positioning office.
Knowable to technical characteristic disclosed in above-mentioned patent, its research emphasis essentially consists in both-end positioning ultimate principle and think of
Road, however, in actual applications, how to differentiate reception signal be exactly echo signal be a difficult problem because in practical application
In, the pulse signal that transmitter module sends can be very weak, and in the case that other interference signals such as noise are very powerful it is impossible to
Accurately receive echo signal.
In order to solve above technical problem it is thus proposed that sending again after amplifying the target impulse signal sending, make powerful
Target impulse signal be easily received, do so can solve certain technical problem to a certain extent.However, ability
Field technique personnel all know, the pulse signal either sending or noise signal or other interference signals, and it is with distance
Increase, it all shows as sinusoidal decay signal, so, in actual applications, can by interference signal be mistakened as into target pulse letter
Number receive.So, for whole detecting system, its final accuracy rate will be had a greatly reduced quality.
In order to solve above technical problem, it is necessary in fact to provide a kind of technical scheme that can solve above technical problem.
[content of the invention]
The invention provides power cable shelf depreciation both-end positioning characteristic pulse generating meanss and its system and method,
From the feature of pulse itself, using there is impulse ejection with sensing function in the combined type lock unit of one,
Eye, in how to obtain effective characteristic pulse, enhancing scene capacity of resisting disturbance and be accurately positioned discharge position, is cable local
Breakdown location provides basis and ensures.
For achieving the above object, the present invention employs the following technical solutions:
A kind of power cable shelf depreciation both-end positioning uses characteristic pulse generating meanss, and this pulse generating unit mainly includes
Supply socket, Industrial Frequency Transformer tf, characteristic pulse shaping unit wh and the characteristic pulse generating unit rpg being sequentially connected, described
Characteristic pulse shaping unit wh includes input port a and input port b and output port c and output port d, this feature pulse
Shaping unit wh includes the first circuit and the second circuit being coupled by electric capacity of voltage regulation c1, wherein, described first circuit bag
Include the first diode d1, the second diode d2, the 3rd diode d3 and the 4th diode d4, wherein, be cascaded first
Diode d1 and the second diode d2 and the 3rd diode d3 being cascaded and the 4th diode d4 is connected in parallel, described defeated
Inbound port a is connected to the node between the first diode d1 and the second diode d2, and described input port b is connected to the three or two pole
Node between pipe d3 and the 4th diode d5；Described second circuit includes inductance l1 and the 5th diode d5 connecting, described
5th diode two ends are parallel with electric capacity c2, are connected with electric capacity c3 further in the outfan of second circuit, and this electric capacity c3 is in parallel
Output port c and output port d two ends in pulse generating units.
Described Industrial Frequency Transformer tf adopts racetrack core structure, its primary and secondary side electrical isolation.
The former limit of described Industrial Frequency Transformer tf is connected on the zero line and live wire of supply socket, described Industrial Frequency Transformer
The secondary of tf is connected to two inputs of characteristic pulse shaping unit wh.
The class of insulation of described Industrial Frequency Transformer tf is not less than 20kv.
Described characteristic pulse generating unit rpg mainly by the 6th diode d6, the 4th electric capacity c4, pulse transformer t, the 5th
Electric capacity c5 and the 7th diode d7 is constituted；The described input port 1 of characteristic pulse generating unit rpg and the 6th diode d6
Anode be connected, the negative electrode of the 6th diode d6 is connected with the 4th electric capacity c4 left end, the 4th electric capacity c4 right-hand member and pulse transformer t
11 points of connections of former limit, 12 points of pulse transformer t former limit is connected with input port 2；21 points of pulse transformer t secondary and the 5th electric capacity
One end of c5 connects, and the other end of the 5th electric capacity c5 is connected with the anode of the 7th diode d7 and output interface 3, the seven or two pole
22 points of the negative electrode of pipe d7 and pulse transformer t and output port 4 are connected.
Up to 10mhz, dielectric strength is 20kv to the maximum pulse rate of described pulse transformer t.
A kind of inspection of the local discharge signal based on power cable shelf depreciation both-end positioning with characteristic pulse generating meanss
Examining system, including the first HF current transformer being socketed in cable under test near-end, the output of this first HF current transformer
End is connected with measuring unit, sends, by measuring unit, the Gauss feature pulse that pulse generating units produce, in cable under test
Far-end clamp have the second HF current transformer, and the input of this second HF current transformer is connected with reflector element, is used for
Receive and recognize the Gauss feature pulse sending from measuring unit；The input of described first HF current transformer and the second height
The outfan of frequency current transformer is connected to power cable shelf depreciation both-end positioning characteristic pulse generating meanss；Described
The sinusoidal decay curve that Gauss feature pulse curve and interference source produce is entirely different.
A kind of both-end localization method of power cable partial discharge signal, when tested cable is longer, in tested cable
Near-end places measuring unit, arranges lock unit in its far-end；Cable proximal measurement unit passes through the first High Frequency Current Sensor
By Gauss feature pulse through cable transmission to cable far-end, far-end lock unit passes through after Gauss feature pulse is detected immediately
Second High Frequency Current Sensor reflection same characteristic features Gaussian pulse, puts source position by calculating digital office of partial discharge pulse
Put.
From Gaussian pulse send until reflection synchronous Gaussian pulse by the first HF current transformer receive total when
Between be t, then Gauss feature pulse along whole cable under test one-way propagation time be t/2, spread speed be v=2l/t, l be electricity
Cable total length；When shelf depreciation occurred in certain moment, office puts pulse and propagates to cable two ends, according to cable near-end wave recording,
First current sensor receives first pulse in time t1, receives, in time t2, second that other end end reflects
Pulse, then the position x that shelf depreciation occurs passes through formula: x=(t+t1-t2) v/2 and calculates.
Compared with prior art, the present invention at least has the advantages that feature of present invention pulse generating units are used for
When distance power cable Partial Discharge Detection and positioning, possesses feature identification convenience, pulse amplitude is adjustable, repetition rate is adjustable
The features such as, improve the synchronous reliability of cable both-end, accuracy and capacity of resisting disturbance.When tested cable is longer, tested
The near-end of cable places measuring unit, arranges lock unit in its far-end；Cable proximal measurement unit passes through the first high frequency electric
By Gauss feature pulse through cable transmission to cable far-end, far-end lock unit stands after Gauss feature pulse is detected sensor
Pass through the second High Frequency Current Sensor and reflect same characteristic features Gaussian pulse, by calculating digital office of partial discharge pulse
Put source position.The present invention is that distance power cable shelf depreciation positioning provides brand-new solution.
[brief description]
The above is only the present invention program general introduction, in order to become apparent from that the technological means of the present invention are described, below in conjunction with attached
Figure is elaborated to the present invention with specific embodiment.
Fig. 1 is the composition signal of power cable shelf depreciation both-end positioning characteristic pulse generating meanss of the present invention and system
Figure.
Fig. 2 is power cable shelf depreciation both-end positioning characteristic pulse generating meanss of the present invention and system pulses shaping list
The composition schematic diagram of first (wh).
Fig. 3 is sent out with system features pulse for power cable shelf depreciation both-end positioning characteristic pulse generating meanss of the present invention
Raw unit (rpg) composition schematic diagram substantially.
[specific embodiment]
Refer to shown in Fig. 2, the invention discloses power cable shelf depreciation both-end positioning uses characteristic pulse generating meanss,
Main inclusion supply socket, Industrial Frequency Transformer tf, characteristic pulse shaping unit wh, characteristic pulse generating unit rpg.
Described supply socket has three contacts g, n, l, and wherein contact g is grounded, contact n (zero line) and Industrial Frequency Transformer tf
Former limit 1 foot is connected, and contact l (live wire) is connected with Industrial Frequency Transformer tf former limit 2 foot.Described Industrial Frequency Transformer tf secondary 3 foot and spy
Levy pulse shaping unit wh input a point to be connected, Industrial Frequency Transformer tf secondary 4 foot and characteristic pulse shaping unit wh input b
Point is connected.Described characteristic pulse shaping unit wh outfan c point is connected with characteristic pulse generating unit rpg1 foot, and characteristic pulse is whole
Shape unit wh outfan d point is connected with characteristic pulse generating unit rpg2 foot.Characteristic pulse generating unit rpg3 foot and tested electricity
One end of cable is connected, and 4 feet of characteristic pulse generating unit rpg are connected with the other end of tested cable.
Described Industrial Frequency Transformer tf adopts racetrack core structure, and former limit input voltage virtual value is 220vac, and secondary is defeated
Going out voltage effective value is 100vac, has tap in the middle of secondary, and tap is common ground end.Described Industrial Frequency Transformer tf transformator is adopted
With isolation structure, primary and secondary side is electrically isolated completely to.The described Industrial Frequency Transformer tf class of insulation is to be not less than 20kv.
Described characteristic pulse shaping unit wh mainly by the first diode d1, the second diode d2, the 3rd diode d3,
Four diode d4, electric capacity of voltage regulation c1, resonant inductance l1, the 5th diode d5, the second electric capacity c2, the 3rd electric capacity c3 are constituted.
The anode of the input port a of described characteristic pulse generating meanss and the first diode d1 and the second diode d2
Negative electrode connect；Input port b is connected with the anode of the 3rd diode d3 and the negative electrode of the 4th diode d4；First diode
The negative electrode of d1 is connected with the left end of the negative electrode, the upper end of electric capacity of voltage regulation c1 and resonant inductance l1 of the 3rd diode d3；Two or two
The anode of the anode of pole pipe d2 and the 4th diode d4, the lower end of electric capacity of voltage regulation c1, the lower end of the 3rd electric capacity c3 and outfan
Mouth d is connected.The right-hand member of resonant inductance l1 is connected with the anode of the 5th diode d5 and the left end of the second electric capacity c2.Five or two pole
The right-hand member of the negative electrode of pipe d5 and the second electric capacity c2, the 3rd electric capacity c3 upper end and output interface c are connected.
Described characteristic pulse generating unit rpg mainly by the 6th diode d6, the 4th electric capacity c4, pulse transformer t, the 5th
Electric capacity c5 and the 7th diode d7 is constituted.
Described characteristic pulse generating unit rpg input port 1 is connected with the anode of the 6th diode d6, the 6th diode
The negative electrode of d6 is connected with the 4th electric capacity c4 left end, and the 4th electric capacity c4 right-hand member is connected for 11 points with pulse transformer t former limit, pulse transforming
12 points of device t former limit is connected with input port 2；21 points of one end with the 5th electric capacity c5 of pulse transformer t secondary are connected, the 5th electric capacity
The other end of c5 is connected with the anode of the 7th diode d7 and output interface 3, the negative electrode of the 7th diode d7 and pulse transforming
22 points of device t and output port 4 are connected.
Up to 10mhz, dielectric strength is 20kv to the maximum pulse rate of described pulse transformer t.
Invention additionally discloses a kind of based on the power cable shelf depreciation both-end positioning office of characteristic pulse generating meanss
Portion's discharge signal detecting system, including the first HF current transformer being socketed in cable under test near-end, this first high frequency electric
The outfan of transformer is connected with measuring unit, sends, by measuring unit, the Gauss feature pulse that pulse generating units produce,
There is the second HF current transformer in the far-end clamp of cable under test, the input of this second HF current transformer is connected with instead
Penetrate unit, for receiving and recognizing the Gauss feature pulse sending from measuring unit.
In local discharge signal detecting system of the present invention, need the characteristic pulse generating meanss of two present invention, wherein
One input being connected to the first HF current transformer, for producing Gauss feature pulse, another one is connected to second
The outfan of HF current transformer, after the second HF current transformer receives Gauss feature pulse, it sends instruction, makes
The characteristic pulse generating meanss being connected to its outfan produce identical Gauss feature pulse and are reflected back the near of cable under test
End, after cable under test receives the Gauss feature pulse of reflection proximally by the first HF current transformer, you can by meter
Calculate partial discharge pulse's time difference and the positioning office source of putting obtains position.
Specifically include following steps:
First the first HF current transformer is socketed in power cable near-end, its signal output part is connected with measuring unit
Connect；Then the second HF current transformer is covered clamp in the far-end of power cable, its interface end is connected with far-end reflector element
Connect；Driving pulse is sent by measuring unit, propagates to the far-end of power cable, far-end reflector element is in the far-end of power cable
After receiving synchronous characteristic pulse and identifying, surveyed to near-end by the pulse that the second HF current transformer sends same feature immediately
Amount unit, proximal measurement unit passes through the first HF current transformer and receives reflectance signature pulse, records total time for t, so
Characteristic pulse along understanding to be t/2 between the unidirectional sowing time of whole cable, spread speed v=2l/t, l is total cable length；Local is put
Electricity occurred in certain moment, and pulse is propagated to cable two ends, and according to cable near-end wave recording, the first current sensor is in time t1
Receive first pulse, receive, in time t2, second pulse that the other end reflects, then the position that shelf depreciation occurs
Put x and can pass through formula: x=(t+t1-t2) v/2 calculating.
Gauss feature pulse curve of the present invention is entirely different with sinusoidal decay curve, by contrast, can be very light
The pulsion phase being produced this pulse with other interference sources such as noises of changing places is distinguished.
Repeated characteristic pulse generating units disclosed by the invention produce nanosecond steep-front Gauss feature pulse, by adjusting
Circuit parameter in characteristic pulse generating unit (rpg) can change characteristic pulse rising edge, characteristic pulse width and feature arteries and veins
Rush repetition rate.When this feature pulse generating units are used for distance power cable Partial Discharge Detection with positioning, possesses feature
The features such as identification is convenient, pulse amplitude is adjustable, repetition rate is adjustable, improve the synchronous reliability of cable both-end, accuracy with
Capacity of resisting disturbance.When tested cable is longer, place measuring unit in the near-end of tested cable, synchronous single in the setting of its far-end
Unit；Cable proximal measurement unit will be remote to cable through cable transmission for Gauss feature pulse by the first High Frequency Current Sensor
End, far-end lock unit passes through the second High Frequency Current Sensor immediately after Gauss feature pulse is detected and reflects same characteristic features Gauss
Pulse, puts source position by calculating digital office of partial discharge pulse.The present invention is distance power cable shelf depreciation
Positioning provides brand-new solution.
The present invention provides power cable shelf depreciation both-end positioning to use characteristic pulse generating meanss, has safe, portable, accurate
Really the features such as, solve the rising edge steepness of current long-distance cable shelf depreciation positioning synchronous pulse, pulse width, repeat frequency
The problems such as rate can not adjust and lead to shelf depreciation location misalignment, led to not positioning by scene interference, compensate for current power
Cable local discharge detection and location technology deficiency in actual applications.
After this design, the present invention at least has the advantage that
1st, the present invention adopts isolated architecture design, and Industrial Frequency Transformer and pulse transformer are respectively provided with enough dielectric levels,
Ensure that safety during human users' instrument；
When the 2nd, carrying out Site Detection using patent of the present invention, operator pass through to adjust characteristic pulse generating unit (rpg)
Pulse front edge adjust electric capacity c4 and pulse back edge and adjust electric capacity c5 it is convenient to the index of adjustment high-frequency characteristic pulse rises
Edge, trailing edge, pulse width and repetition rate.Improve the efficiency of staff's detection, by adjusting the leading-edge steepness of pulse
The judgement order of accuarcy of initial time can be improved, thus improving positioning precision and strengthening live capacity of resisting disturbance.
3rd, during on-the-spot test, device of the present invention both can be supported the use thus realizing with cable wave of oscillation test system
The shelf depreciation positioning of long cable, can be separately provided again and realize shelf depreciation powered positioning office for electrification detection system and put source,
There is one-machine-multi-function.
It can be seen that, the present invention creatively solves at distance power cable Partial Discharge Detection scene it is convenient to adjust
The circuit parameter of section characteristic pulse generating unit, realizes rising edge, pulse width and the repetition rate of high-frequency characteristic Gaussian pulse
Adjust, improve Site Detection effect, positioning precision and capacity of resisting disturbance.
The above, be only presently preferred embodiments of the present invention, not the present invention made with any pro forma restriction,
Those skilled in the art make a little simple modification, equivalent variations or modification using the technology contents of the disclosure above, all fall within this
In the protection domain of invention.
Claims (9)
1. a kind of power cable shelf depreciation both-end positioning with characteristic pulse generating meanss it is characterised in that: this pulse generation dress
Put supply socket, Industrial Frequency Transformer (tf), characteristic pulse shaping unit (wh) and the characteristic pulse mainly including being sequentially connected to send out
Raw unit (rpg), described characteristic pulse shaping unit (wh) includes input port a and input port b and output port c and defeated
Exit port d, this feature pulse shaping unit (wh) includes the first circuit and the second circuit being coupled by electric capacity of voltage regulation c1,
Wherein, described first circuit includes the first diode d1, the second diode d2, the 3rd diode d3 and the 4th diode d4, its
In, the first diode d1 being cascaded and the second diode d2 and the 3rd diode d3 being cascaded and the four or two pole
Pipe d4 is connected in parallel, and described input port a is connected to the node between the first diode d1 and the second diode d2, described input
Port b is connected to the node between the 3rd diode d3 and the 4th diode d5；Described second circuit includes the inductance l1 connecting
With the 5th diode d5, described 5th diode two ends are parallel with electric capacity c2, are connected with further in the outfan of second circuit
Electric capacity c3, this electric capacity c3 are connected in parallel on the output port c and output port d two ends of pulse generating units.
2. a kind of power cable shelf depreciation both-end positioning according to claim 1 uses characteristic pulse generating meanss, and it is special
Levy and be: described Industrial Frequency Transformer (tf) adopts racetrack core structure, its primary and secondary side electrical isolation.
3. a kind of power cable shelf depreciation both-end positioning according to claim 1 uses characteristic pulse generating meanss, and it is special
Levy and be: the former limit of described Industrial Frequency Transformer (tf) is connected on the zero line and live wire of supply socket, described power frequency transformation
The secondary of device (tf) is connected to two inputs of characteristic pulse shaping unit (wh).
4. a kind of power cable shelf depreciation both-end positioning according to claim 1 uses characteristic pulse generating meanss, and it is special
Levy and be: the class of insulation of described Industrial Frequency Transformer (tf) is not less than 20kv.
5. a kind of power cable shelf depreciation both-end positioning according to claim 1 uses characteristic pulse generating meanss, and it is special
Levy and be: described characteristic pulse generating unit (rpg) main by the 6th diode d6, the 4th electric capacity c4, pulse transformer t, the
Five electric capacity c5 and the 7th diode d7 are constituted；The described input port 1 of characteristic pulse generating unit (rpg) and the six or two pole
The anode of pipe d6 is connected, and the negative electrode of the 6th diode d6 is connected with the 4th electric capacity c4 left end, and the 4th electric capacity c4 right-hand member is become with pulse
The 11 points of connections of depressor t former limit, 12 points of pulse transformer t former limit is connected with input port 2；21 points of pulse transformer t secondary and the
One end of five electric capacity c5 connects, and the other end of the 5th electric capacity c5 is connected with the anode of the 7th diode d7 and output interface 3, the
The negative electrode of seven diode d7 is connected with 22 points of pulse transformer t and output port 4.
6. a kind of power cable shelf depreciation both-end positioning according to claim 5 uses characteristic pulse generating meanss, and it is special
Levy and be: up to 10mhz, dielectric strength is 20kv to the maximum pulse rate of described pulse transformer t.
7. a kind of occurred based on the power cable shelf depreciation both-end positioning characteristic pulse any one of claim 1-6
The detecting system of the local discharge signal of device it is characterised in that: include being socketed in the first high frequency electric of cable under test near-end
Transformer, the outfan of this first HF current transformer is connected with measuring unit, sends pulse generation dress by measuring unit
Put the Gauss feature pulse of generation, have the second HF current transformer in the far-end clamp of cable under test, this second high frequency electric
The input of transformer is connected with reflector element, for receiving and recognizing the Gauss feature pulse sending from measuring unit；Described
The outfan of the input of the first HF current transformer and the second HF current transformer is connected to power cable local
Electric discharge both-end positioning uses characteristic pulse generating meanss；The sinusoidal decay curve that described Gauss feature pulse curve is produced with interference source
Entirely different.
8. a kind of power cable partial discharge signal both-end localization method it is characterised in that: when tested cable is longer, in quilt
The near-end surveying cable places measuring unit, arranges lock unit in its far-end；Cable proximal measurement unit passes through the first high-frequency electrical
Flow sensor by Gauss feature pulse through cable transmission to cable far-end, after far-end lock unit detects Gauss feature pulse
Pass through the second High Frequency Current Sensor immediately and reflect same characteristic features Gaussian pulse, by calculating partial discharge pulse's digital
Source position is put in office.
9. a kind of power cable partial discharge signal according to claim 8 both-end localization method it is characterised in that: from
Gaussian pulse sends until the total time that the synchronous Gaussian pulse of reflection is received by the first HF current transformer is t, then high
This characteristic pulse is t/2 along the one-way propagation time of whole cable under test, and spread speed is v=2l/t, and l is total cable length；
When shelf depreciation occurred in certain moment, office puts pulse and propagates to cable two ends, and according to cable near-end wave recording, the first electric current passes
Sensor receives first pulse in time t1, receives second pulse being reflected by the other end, then office in time t2
The position x that portion's electric discharge occurs passes through formula: x=(t+t1-t2) v/2 and calculates.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610970575.5A CN106353655A (en) | 2016-10-28 | 2016-10-28 | Characteristic pulse generating device for power cable partial discharge double-ended location as well as system and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610970575.5A CN106353655A (en) | 2016-10-28 | 2016-10-28 | Characteristic pulse generating device for power cable partial discharge double-ended location as well as system and method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108554A (en) * | 2018-02-01 | 2019-08-09 | 株式会社岛津制作所 | Test result evaluation method and Material Testing Machine |
| CN110376498A (en) * | 2019-08-19 | 2019-10-25 | 三峡大学 | A kind of cable local discharge tuning on-line method |
| CN112180218A (en) * | 2020-09-30 | 2021-01-05 | 北京神州泰岳软件股份有限公司 | Partial discharge monitoring method, system and device |
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