CN110045251A - A kind of power cable built-in electrical insulation defects detection and failure detector and method - Google Patents
A kind of power cable built-in electrical insulation defects detection and failure detector and method Download PDFInfo
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- CN110045251A CN110045251A CN201910369198.3A CN201910369198A CN110045251A CN 110045251 A CN110045251 A CN 110045251A CN 201910369198 A CN201910369198 A CN 201910369198A CN 110045251 A CN110045251 A CN 110045251A
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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
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Abstract
The present invention relates to Technology of Power Cables Fault Location fields, more particularly to a kind of power cable built-in electrical insulation defects detection and failure detector and method, take offline mode, the local discharge signal for applying certain frequency, amplitude and corresponding discharge capacity to power cable by the head end in cable to be detected, then in the corresponding local discharge signal of end point detection of cable to be detected.The local discharge signal that cable end piece to be detected is detected and the local discharge signal of front end load carry out correlation analysis, search the loss amount in uncorrelated amount therein and signals transmission.It may determine that the defect in conductor inside cable to be detected according to loss amount, and then can be as the mark of cable built-in electrical insulation defect to be detected, to judge the minor insulation defect inside power cable according to the uncorrelated amount in tail end subsignal.Effective reference is provided for the operation and assessment of cable status.
Description
Technical field
The invention belongs to Technology of Power Cables Fault Location fields more particularly to a kind of power cable built-in electrical insulation defect to examine
Survey and failure detector and method.
Background technique
In the electrical power trans mission/distribution system in China, specific gravity shared by power cable especially three-phase electrical cable is very big, and
As the construction of distribution system increasingly complicated with smart grid needs, the application of three-phase electrical cable then becomes more wide
It is general.Power cable is during manufacture, because mechanical equipment, artificial reason, can generate various defects, some are lacked
Fall into and be located at cable surface, will not cause too much influence to the use of cable, but be located at the defect inside power cable due to
By huge field effect, larger hidden danger can be generated to the safe and stable operation of cable.On the other hand, power cable is being run
During because of ambient enviroment, outside construction can make the defect for occurring in conductor or insulation inside cable.Inside these
Defect can be gradually increased during power cable is run with the raising of voltage and the increase of electric current, eventually lead to electric power
Cable insulation breakdown.At this point, large-scale power-off event for a long time can all be caused by repairing or replacing again.Therefore it proposes new
Method and apparatus to inside power cable small insulation defect or defect in conductor detected or detected a flaw, to complete
The detection of power cable insulation and health status evaluation all have a very important significance.
Traditional power cable detection mode is divided into detection and postrun on-line monitoring before operation.Detection before operation
It can check most of manufacturing defect on power cable surface.And use online mode to the operating status of power cable into
Row monitoring is typically necessary a large amount of equipment of investment, artificial and expense.And another aspect, use traditional detection
Mode can only all detect apparent conductor or insulation defect, and the purpose of detection is then unable to reach for minor insulation defect,
On the one hand, due to minor insulation defect can't the operation current to power cable have an impact, thus be not available online prison
Survey mode is searched.On the other hand, local conductor or insulation defect can with the accumulative of power cable runing time and
Gradually develop and develop, so that small defect gradually expands, eventually leads to cable and integrally puncture and scrap.Presently, there are electricity
Power cable quickly can not be detected and be searched flaw detection by directly internal portion's insulation defect using in preceding and operational process, while can not
The problem of defect management is carried out to different classes of cable.
Summary of the invention
The object of the present invention is to provide a kind of bad detections and flaw detection with insulation defect of achievable connector inner conductor to look into
The device and method looked for.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of power cable built-in electrical insulation defects detection and
Failure detector, including cable to be detected, cable head end terminal to be detected, cable end terminator to be detected, further include host computer, with
Local discharge signal generating device, terminal wireless route device, data server and signal decomposition that host computer is separately connected with
Switching device, the coupling amplification device being connect with local discharge signal generating device by coaxial cable, with cable end to be detected
The high-frequency high-precision current transformer for holding terminal connection passes through band shielded radio frequency cable connection with high-frequency high-precision current transformer
Power frequency filter, connect with power frequency filter local discharge signal detection and processing unit, with local discharge signal
Detect the front end wireless router device connecting with processing unit；Front end wireless router device passes through WIFI network and terminal wireless road
It is connected by device, signal decomposition is connect by band shielded cable with cable head end terminal to be detected with switching device, coupling amplification
Device is connect by coaxial cable with signal decomposition with switching device, and cable end terminator to be detected connects by three-phase ground line
Ground.
In above-mentioned power cable built-in electrical insulation defects detection and failure detector, signal decomposition and switching device include 1
A data signal input terminal, 3 data-signal output terminals and 1 control signal input；Wherein, 1 data-signal
Input terminal passes through band screened coaxial cable and connect with coupling amplification device, and 3 data-signal output terminals pass through band shielding electricity
Cable is connect with threephase cable front end to be detected terminal, and 1 control signal input is connected by RS485 signal wire and host computer
It connects.
A kind of power cable built-in electrical insulation defects detection and the method for flaw detection, comprising the following steps:
Step 1 is set the partial discharge pulse's signal for needing the different frequency generated and amplitude by host computer, and sent
To local discharge signal generating device, number switching signal is simultaneously emitted by signal decomposition and switching device；
Step 2, local discharge signal generating device receive the instruction of host computer, and the part for generating specified amplitude and frequency is put
Electric signal is transferred to signal decomposition and switching device by coupling amplification device；
Step 3, signal decomposition and switching device receive the signal of the local discharge signal generating device by coupling amplification
And the number switching signal that host computer issues, it will be loaded by the local discharge signal of coupling amplification using voltage terminal wiring
Onto the front end terminal of cable to be detected；Cable end terminator to be detected is grounded by three-phase ground line；
Step 4 detects local discharge signal on cable end terminator to be detected using high-frequency high-precision current transformer
And local discharge signal detection and processing unit are transferred to by power frequency filter；
The local discharge signal of acquisition is passed through front end wireless routing by step 5, local discharge signal detection and processing unit
Device is transmitted to terminal wireless route device；
Received local discharge signal is sent to host computer by step 6, terminal wireless route device；
Sending and received local discharge signal is compared analysis by step 7, host computer, is found out in cable to be detected
Portion's insulation defect, and all data are stored into data server；
Step 8, the judging result and output test result report for providing cable conductor and built-in electrical insulation defect to be detected.
In above-mentioned power cable built-in electrical insulation defects detection and the method for flaw detection, host computer described in step 7 will be issued
And received local discharge signal be compared analysis, finding out cable built-in electrical insulation defect, specific step is as follows:
Step 7.1, comprehensive local discharge signal degree of correlation PC≤ 0.1, single local discharge signal degree of correlation PO≤ 0.1, then
There are defect in conductor inside cable to be detected；
Step 7.2, comprehensive local discharge signal degree of correlation PC≤ 0.1, single 0.1 < P of the local discharge signal degree of correlationO<
0.9, then there are three phase isolated defects inside cable to be detected；
Step 7.3, comprehensive local discharge signal degree of correlation PC≤ 0.1, single local discharge signal degree of correlation PO>=0.9, then
There are two-phase insulation defects inside cable to be detected；
Step 7.4, comprehensive 0.1 < P of the local discharge signal degree of correlationC< 0.9, single local discharge signal degree of correlation PO≤
0.1, then there are three phase isolated defects inside cable to be detected；
Step 7.5, comprehensive 0.1 < P of the local discharge signal degree of correlationC< 0.9, the single local discharge signal degree of correlation 0.1
< PO< 0.9, then there are two-phase insulation defects inside cable to be detected；
Step 7.6, comprehensive 0.1 < P of the local discharge signal degree of correlationC< 0.9, single local discharge signal degree of correlation PO≥
0.9, then there are two-phase insulation defects inside cable to be detected；
Step 7.7, comprehensive local discharge signal degree of correlation Pc>=0.9, single local discharge signal degree of correlation PO≤ 0.1, then
There are single-phase insulation defects inside cable to be detected；
Step 7.8, comprehensive local discharge signal degree of correlation PC>=0.9, single 0.1 < P of the local discharge signal degree of correlationO<
0.9, then there are single-phase insulation defects inside cable to be detected；
Step 7.9, comprehensive local discharge signal degree of correlation PC>=0.9, single local discharge signal degree of correlation PO>=0.9, then
Connector inner conductor to be detected and insulation are all right.
Beneficial effects of the present invention: the present invention can be achieved the bad detection and flaw detection with insulation defect of connector inner conductor and look into
It looks for, while the defect operation archives and database of power cable can be established on this basis, be the safe and stable operation of power cable
It is established with effective, reliable repair and replacement are provided, is power cable built-in electrical insulation state-detection and flaw detection assessment in smart grid
Technology provides effectively reference.
Detailed description of the invention
Fig. 1 is the connection of hardware device involved in embodiment and detection system data channel flow chart at the present invention one；
Wherein, 1- cable head end terminal to be detected, 2- cable to be detected, 3- high-frequency high-precision current transformer, 4- are to be checked
Survey cable end terminator, 5- earth lead, 6- band shielded radio frequency cable, 7- power frequency filter, the detection of 8- local discharge signal
With processing unit, the front end 9- wireless router device, 10-WIFI network, 11- terminal wireless route device, 12- data server,
13- host computer, 14- local discharge signal generating device, 15- coaxial cable, 16- coupling amplification device, 17- signal decomposition with cut
Changing device data signal input terminal, 18- signal decomposition and switching device control signal input son, 19- signal decomposition with cut
Changing device, 20- signal decomposition and switching device data signal output, 21- band shielded cable；
Fig. 2 is the operation of power cable built-in electrical insulation defects detection and failure detector involved in one embodiment of the invention
And analysis flow chart diagram；
Fig. 3 is used in power cable built-in electrical insulation defects detection involved in one embodiment of the invention and method of detection
It calculates and logic analysis tree.
Specific embodiment
Embodiments of the present invention are described in detail with reference to the accompanying drawing.
The present embodiment takes offline mode, by the head end in cable to be detected to power cable apply certain frequency,
The local discharge signal of amplitude and corresponding discharge capacity, then in the corresponding local discharge signal of end point detection of cable to be detected.
The local discharge signal that cable end piece to be detected is detected and the local discharge signal of front end load carry out correlation analysis, look into
Look for the loss amount in uncorrelated amount therein and signals transmission.It may determine that inside cable to be detected according to loss amount
Defect in conductor, and then can be as cable built-in electrical insulation defect to be detected according to the uncorrelated amount in tail end subsignal
Mark, to judge the minor insulation defect inside power cable, provides effective ginseng for the operation and assessment of cable status
It examines.
The present embodiment is achieved through the following technical solutions: a kind of power cable built-in electrical insulation defects detection and flaw detection
Device, cable head end terminal 1 to be detected passes through the number with shielded cable 21 Yu signal decomposition and switching device 19 as shown in Figure 1:
It being connected according to signal output terminal 20, signal decomposition is connect with the control signal input of switching device 19 18 with host computer 13,
Signal decomposition is connect by coaxial cable 15 with coupling amplification device 16 with the data signal input terminal 17 of switching device 19, coupling
Amplifying device 16 is closed to be connect with local discharge signal generating device 14 by coaxial cable 15, host computer 13 respectively with shelf depreciation
Signal generation apparatus 14, data server 12 and terminal wireless route device 11 connect；High-frequency high-precision current transformer 3 connects
Cable end terminator 4 to be detected, and power frequency filter 7 and local discharge signal detection are connected by band shielded radio frequency cable 6
With processing unit 8, front end wireless router device 9 is reconnected, front end wireless router device 9 passes through WIFI network 10 and terminal wireless
Route device 11 connects.Cable end terminator head 4 to be detected is grounded by three-phase ground line.
As shown in Fig. 2, the method based on above-mentioned power cable built-in electrical insulation defects detection and failure detector, comprising:
1) the partial discharge pulse's signal for generating different frequency and amplitude is set by upper computer software, issues signal
Local discharge signal generating device is instructed, is simultaneously emitted by number switching signal to signal decomposition and switching device；
2) local discharge signal generating device receives the instruction of host computer, generates the shelf depreciation letter of specified amplitude and frequency
Number, signal output and switching device are transferred to by coupling amplification device；
3) road that signal decomposition and switching device receive the signal of local discharge signal generating device and host computer issues
Number switching signal will be loaded into the front end of cable to be detected using voltage terminal wiring by the local discharge signal of coupling amplification
On terminal, cable end terminator head to be detected is grounded by three-phase ground line；
4) local discharge signal is detected simultaneously on cable end terminator head to be detected using high-frequency high-precision current transformer
Local discharge signal detection and processing unit are transferred to by power frequency filter；
5) local discharge signal detection and processing unit by the local discharge signal of acquisition by front end wireless router device
It transfers out；
6) signal message of terminal wireless route device receiving front-end wireless router device and host computer is passed the signal to
It is compared analysis, finds out cable built-in electrical insulation defect；
And it will test and be shown on output screen with result of detection, while will test and arrive server with flaw detection data storage
In database.
Firstly, calculating the local discharge signal of threephase cable front end to be detected input and part that cable end piece detects is put
Electric signal carries out single local discharge signal degree of correlation PO, comprehensive local discharge signal degree of correlation PC.Then, according to single part
Discharge signal related coefficient PO, comprehensive local discharge signal related coefficient PCCarry out the judgement of threephase cable defect in conductor to be detected.
Further according to single local discharge signal related coefficient PO, comprehensive local discharge signal related coefficient PCCarry out threephase cable to be detected
The judgement of built-in electrical insulation defect.By cable model, company-information, conductor and the deposit of insulation defect data that detection and flaw detection are found
To data storage into the database of data server；Finally provide sentencing for threephase cable conductor to be detected and built-in electrical insulation defect
Disconnected result and output test result report.
As shown in figure 3, step (1) integrates local discharge signal degree of correlation PC≤ 0.1, the single local discharge signal degree of correlation
PO≤ 0.1, then there are defect in conductor inside cable to be detected；
Step (2) integrates local discharge signal degree of correlation PC≤ 0.1, single 0.1 < P of the local discharge signal degree of correlationO<
0.9, then there are three phase isolated defects inside cable to be detected；
Step (3) integrates local discharge signal degree of correlation PC≤ 0.1,0.9≤P of the single local discharge signal degree of correlationO, then
There are two-phase insulation defects inside cable to be detected；
Step (4) integrates 0.1 < P of the local discharge signal degree of correlationC< 0.9, single local discharge signal degree of correlation PO≤
0.1, then there are three phase isolated defects inside cable to be detected；
Step (5) integrates 0.1 < P of the local discharge signal degree of correlationC< 0.9, single 0.1 < of the local discharge signal degree of correlation
PO< 0.9, then there are two-phase insulation defects inside cable to be detected；
Step (6) integrates 0.1 < P of the local discharge signal degree of correlationC< 0.9, the single local discharge signal degree of correlation 0.9≤
PO, then there are two-phase insulation defects inside cable to be detected；
Step (7) integrates 0.9≤P of the local discharge signal degree of correlationC, single local discharge signal degree of correlation PO≤ 0.1, then
There are single-phase insulation defects inside cable to be detected；
Step (8) integrates 0.9≤P of the local discharge signal degree of correlationC, single 0.1 < P of the local discharge signal degree of correlationO<
0.9, then there are single-phase insulation defects inside cable to be detected；
Step (9) integrates 0.9≤P of the local discharge signal degree of correlationC, 0.9≤P of the single local discharge signal degree of correlationO, then
Connector inner conductor to be detected and insulation are all right；
7) conductor and the deposit of insulation defect data that inspection software finds cable model, company-information, detection and flaw detection
In database on to data storage server；
8) judging result and output test result report of cable conductor and built-in electrical insulation defect to be detected are provided.
When it is implemented, including:
(1) number of local discharge signal, frequency, amplitude and discharge capacity size are carried out on position machine software on computers
Setting, input setting data.
(2) software generates Trig control signal according to the discharge signal frequency, amplitude and discharge capacity data of setting, raw simultaneously
At number switching signal.
(3) Trig control signal and number switching signal are respectively transmitted by RS485 communication cable to local discharge signal
Generating device and signal decomposition and switching device.
(4) local discharge signal generating device receives the Trig control signal that host computer transmission comes, generate specified amplitude and
The local discharge signal of frequency.
(5) local discharge signal generated is transferred to coupling amplification device by coaxial cable and carries out coupling filtering.
(6) there is a signal input part to pass through band screened coaxial cable and fill with coupling amplification for signal decomposition and switching device
Connection is set, 3 data-signal output terminals pass through band shielded cable and connect with threephase cable terminal, 1 control signal input
Son is connect by RS485 communication cable with host computer.
(7) local discharge signal through overcoupling filtering is transferred to signal decomposition by band screened coaxial cable and switching fills
The data signal input terminal set.
(8) signal decomposition and switching device receive the local discharge signal filtered through overcoupling, while defeated from control signal
Enter the number switching signal that end reception host computer is sent and local discharge signal is switched into required number.
(9) local discharge signal passes through band shielded cable from signal decomposition and switching device data signal output and transmits
To three-phase electrical cable front end to be detected terminal head.
(10) using the round high-frequency high-precision Current Mutual Inductance being installed on three-phase electrical cable end terminals head to be detected
Device detects local discharge signal.Three-phase electrical cable end terminals head to be detected is connect by ground connection copper litz wire with the earth.
(11) round high-frequency high-precision current transducer signal output end passes through band Shielded video cable and shelf depreciation is believed
Number detection is connect with processing unit.
(12) local discharge signal that local discharge signal detection will acquire with processing unit is through over-sampling and analog-to-digital conversion
Become digital information later.
(13) digital signal after converting is used with after the temporal information compression being superimposed by front end wireless router device
WIFI network is sent.
(14) terminal wireless route device is received front end wireless router device using WIFI network and is sent using WIFI network
The local discharge signal information that comes over simultaneously sends upper computer software to.
(15) local discharge signal and cable end piece to be detected that upper computer software is sent according to cable head end to be detected connect
The local discharge signal being subject to is analyzed and is compared, and finds out the insulation defect inside cable to be detected, and provide analysis and meter
Calculate result.
(16) the shelf depreciation letter that the local discharge signal and cable end piece of threephase cable front end input to be detected detect
Number carry out single local discharge signal degree of correlation PO, comprehensive local discharge signal degree of correlation PCCalculating.
(17) according to single local discharge signal related coefficient PO, comprehensive local discharge signal related coefficient PCIt carries out to be checked
Survey the judgement of cable conductor defect；
(18) according to single local discharge signal related coefficient PO, comprehensive local discharge signal related coefficient PCIt carries out to be checked
Survey the judgement of cable built-in electrical insulation defect；
(19) comprehensive local discharge signal degree of correlation PC≤ 0.1, single local discharge signal degree of correlation PO≤ 0.1, then it is to be checked
There are defect in conductor inside survey cable；
(20) comprehensive local discharge signal degree of correlation PC≤ 0.1, single 0.1 < P of the local discharge signal degree of correlationO< 0.9,
Then there are three phase isolated defects inside cable to be detected；
(21) comprehensive local discharge signal degree of correlation PC≤ 0.1,0.9≤P of the single local discharge signal degree of correlationO, then to be checked
There are two-phase insulation defects inside survey cable；
(22) comprehensive 0.1 < P of the local discharge signal degree of correlationC< 0.9, single local discharge signal degree of correlation PO≤ 0.1,
Then there are three phase isolated defects inside cable to be detected；
(23) comprehensive 0.1 < P of the local discharge signal degree of correlationC< 0.9,0.1 < P of the single local discharge signal degree of correlationO<
0.9, then there are two-phase insulation defects inside cable to be detected；
(24) comprehensive 0.1 < P of the local discharge signal degree of correlationC< 0.9,0.9≤P of the single local discharge signal degree of correlationO,
Then there are two-phase insulation defects inside cable to be detected；
(25) comprehensive 0.9≤P of the local discharge signal degree of correlationC, single local discharge signal degree of correlation PO≤ 0.1, then it is to be checked
There are single-phase insulation defects inside survey cable；
(26) comprehensive 0.9≤P of the local discharge signal degree of correlationC, single 0.1 < P of the local discharge signal degree of correlationO< 0.9,
Then there are single-phase insulation defects inside cable to be detected；
(27) comprehensive 0.9≤P of the local discharge signal degree of correlationC, 0.9≤P of the single local discharge signal degree of correlationO, then to be checked
It surveys connector inner conductor and insulate all right；
(28) host computer is by the model of three-phase electrical cable to be detected, company-information, and detecting and detect a flaw, it is exhausted to find
Edge defect is deposited into data storage server, establishes electric cable stoppage database.
(29) judging result and output test result report of cable conductor and built-in electrical insulation defect to be detected are provided.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although being described in conjunction with the accompanying a specific embodiment of the invention above, those of ordinary skill in the art should
Understand, these are merely examples, various deformation or modification can be made to these embodiments, without departing from original of the invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (4)
1. a kind of power cable built-in electrical insulation defects detection and failure detector, including cable to be detected, cable head end end to be detected
Cable end terminator, to be detected, characterized in that further include host computer, sent out with the local discharge signal that host computer is separately connected
Generating apparatus, terminal wireless route device, data server and signal decomposition and switching device, with local discharge signal generating device
The coupling amplification device connected by coaxial cable, the high-frequency high-precision Current Mutual Inductance being connect with cable end terminator to be detected
Device, with high-frequency high-precision current transformer by the power frequency filter with shielded radio frequency cable connection, with power frequency filter
The local discharge signal of connection detects and processing unit, detects the front end connecting with processing unit without route with local discharge signal
By device；Front end wireless router device is connect by WIFI network with terminal wireless route device, signal decomposition and switching device
It is connect by band shielded cable with cable head end terminal to be detected, coupling amplification device passes through coaxial cable and signal decomposition and cuts
Changing device connection, cable end terminator to be detected are grounded by three-phase ground line.
2. power cable built-in electrical insulation defects detection as described in claim 1 and failure detector, characterized in that signal decomposition with
Switching device includes 1 data signal input terminal, 3 data-signal output terminals and 1 control signal input；Its
In, 1 data signal input terminal passes through band screened coaxial cable and connect with coupling amplification device, 3 data signal outputs
Son is connect by band shielded cable with threephase cable front end to be detected terminal, and 1 control signal input passes through RS485 signal
Line is connect with host computer.
3. a kind of power cable built-in electrical insulation defects detection and the method for flaw detection, characterized in that the following steps are included:
Step 1 is set the partial discharge pulse's signal for needing the different frequency generated and amplitude by host computer, and is sent to office
Portion's discharge signal generating device is simultaneously emitted by number switching signal to signal decomposition and switching device；
Step 2, local discharge signal generating device receive the instruction of host computer, generate the shelf depreciation letter of specified amplitude and frequency
Number, signal decomposition and switching device are transferred to by coupling amplification device；
Step 3, signal decomposition and switching device receive by the local discharge signal generating device of coupling amplification signal and
Host computer issue number switching signal, using voltage terminal wiring by by coupling amplification local discharge signal be loaded into
On the front end terminal of detection cable；Cable end terminator to be detected is grounded by three-phase ground line；
Step 4 is detected local discharge signal using high-frequency high-precision current transformer and is passed through on cable end terminator to be detected
It crosses power frequency filter and is transferred to local discharge signal detection and processing unit；
The local discharge signal of acquisition is passed through front end wireless router device by step 5, local discharge signal detection and processing unit
It is transmitted to terminal wireless route device；
Received local discharge signal is sent to host computer by step 6, terminal wireless route device；
Sending and received local discharge signal is compared analysis by step 7, host computer, is found out inside cable to be detected absolutely
Edge defect, and all data are stored into data server；
Step 8, the judging result and output test result report for providing cable conductor and built-in electrical insulation defect to be detected.
4. power cable built-in electrical insulation defects detection as claimed in claim 3 and the method for flaw detection, characterized in that step 7 institute
It states host computer and sending and received local discharge signal is compared analysis, find out the specific step of cable built-in electrical insulation defect
It is rapid as follows:
Step 7.1, comprehensive local discharge signal degree of correlation PC≤ 0.1, single local discharge signal degree of correlation PO≤ 0.1, then it is to be checked
There are defect in conductor inside survey cable；
Step 7.2, comprehensive local discharge signal degree of correlation PC≤ 0.1, single 0.1 < P of the local discharge signal degree of correlationO< 0.9,
Then there are three phase isolated defects inside cable to be detected；
Step 7.3, comprehensive local discharge signal degree of correlation PC≤ 0.1, single local discharge signal degree of correlation PO>=0.9, then it is to be checked
There are two-phase insulation defects inside survey cable；
Step 7.4, comprehensive 0.1 < P of the local discharge signal degree of correlationC< 0.9, single local discharge signal degree of correlation PO≤ 0.1,
Then there are three phase isolated defects inside cable to be detected；
Step 7.5, comprehensive 0.1 < P of the local discharge signal degree of correlationC< 0.9,0.1 < P of the single local discharge signal degree of correlationO<
0.9, then there are two-phase insulation defects inside cable to be detected；
Step 7.6, comprehensive 0.1 < P of the local discharge signal degree of correlationC< 0.9, single local discharge signal degree of correlation PO>=0.9,
Then there are two-phase insulation defects inside cable to be detected；
Step 7.7, comprehensive local discharge signal degree of correlation Pc>=0.9, single local discharge signal degree of correlation PO≤ 0.1, then it is to be checked
There are single-phase insulation defects inside survey cable；
Step 7.8, comprehensive local discharge signal degree of correlation PC>=0.9, single 0.1 < P of the local discharge signal degree of correlationO< 0.9,
Then there are single-phase insulation defects inside cable to be detected；
Step 7.9, comprehensive local discharge signal degree of correlation PC>=0.9, single local discharge signal degree of correlation PO>=0.9, then it is to be checked
It surveys connector inner conductor and insulate all right.
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| CN201910369198.3A CN110045251B (en) | 2019-05-05 | 2019-05-05 | Power cable internal insulation defect detection and flaw detection device and method |
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| CN201910369198.3A CN110045251B (en) | 2019-05-05 | 2019-05-05 | Power cable internal insulation defect detection and flaw detection device and method |
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