CN108459247A - A kind of high-voltage cable joint partial discharge detection position indicator and partial discharge detection localization method - Google Patents
A kind of high-voltage cable joint partial discharge detection position indicator and partial discharge detection localization method Download PDFInfo
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- CN108459247A CN108459247A CN201810226618.8A CN201810226618A CN108459247A CN 108459247 A CN108459247 A CN 108459247A CN 201810226618 A CN201810226618 A CN 201810226618A CN 108459247 A CN108459247 A CN 108459247A
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- 238000001514 detection method Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000004807 localization Effects 0.000 title claims abstract description 6
- 238000012545 processing Methods 0.000 claims abstract description 34
- 238000013500 data storage Methods 0.000 claims abstract description 25
- 230000015654 memory Effects 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
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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
Abstract
The present invention relates to a kind of high-voltage cable joint partial discharge detection position indicator and partial discharge detection localization method, including capacitance sensor and signal pickup assembly, the signal processing apparatus that can be mounted in shell；The signal processing apparatus data show device, control device and data storage device by connection；The partial discharge capacitance sensor quantity at least two and use multi-drop arrangement array placement, each described capacitance sensor passes through independent circuit respectively and the signal pickup assembly is electrically connected.The high-voltage cable joint partial discharge detection position indicator partial discharge detection precision is higher, accurate positioning, safe and reliable, anti-interference ability is stronger.
Description
Technical field
The present invention relates to high-voltage electricity partial discharge detection technical fields, and it is fixed to be specifically related to a kind of high-voltage cable joint partial discharge detection
Position instrument and partial discharge location detection method.
Background technology
The electric discharge that Electric Power Equipment Insulation occurs under sufficiently strong electric field action in subrange.This electric discharge is only to cause
Insulation locally short (road and bridge) between conductor connects to be limited without forming conductive channel.Shelf depreciation can all have dielectric each time
Some are influenced, and influence of the slight shelf depreciation to Electric Power Equipment Insulation is smaller, and the decline of dielectric strength is slower;And strong office
Portion discharges, then dielectric strength can be made to decline quickly.This is a key factor for making the apparatus insulated damage of high-tension electricity.Therefore,
When design high-tension electricity is apparatus insulated, to consider under the action of long-term work voltage, not allow to occur in insulation system stronger
Strong shelf depreciation.Running equipment will be reinforced monitoring, when being locally discharged beyond to a certain degree, equipment should be exited to fortune
Row, is overhauled or is replaced.
Blood vessels of the high-tension cable as power supply system provide required electric energy for the production and living in city.Once cable
It breaks down.It is influenced caused by urban life inestimable.The major failure position of high-tension cable is high-voltage cable joint.Cause
This, the partial discharge detection for carrying out high-voltage cable joint is to ensure that the main points of high-tension cable steady operation.The part of high-tension cable, which is put, asks
Topic is to cause the principal element of high-tension cable accident, is constantly subjected to extensive concern for many years.To find out its cause, on the one hand mainly by
In the insulating element existing defects of cable, the micro electric discharge in part is generated.And the discharge process accelerates the bad of insulating performance of cable
Change, eventually leads to cable breakdown.The early stage partial discharge phenomenon for how measuring cable has important meaning to preventing cable fault
Justice.On the other hand, it is the weak link of power cable insulation since the electric field stress of intermediate joint of electric cable is more concentrated,
It is more prone to insulation fault.According to statistics, most cable insulation breakdown problem is happened at cable intermediate joint position.
Cable connector partial discharge occurs point and is concentrated mainly on high-tension cable silicon rubber.If being capable of positioning cable connector rubber
The specific location of insulating layer.Digitization analysis is carried out to the failure problems of cable connector rubber layer.Find out cable connector rubber layer
Weak link is conducive to produce the better product of qualification rate.
Applicant's earlier application of this patent application No. is 201710225831.2 Chinese invention patent applications to disclose
A kind of netted differential type cable connector partial discharge detection device and method, netted differential type cable connector partial discharge detection device include
Detecting signal unit and signal processing unit, the detecting signal unit and signal processing unit are set at cable connector；Letter
Number detection unit is reticular structure, using multiple-piece distributed arrangement, forms differential seat angle；Signal processing unit uses Differential Detection
Principle handles multigroup signal that detecting signal unit transmits.Existed using netted differential type cable connector partial discharge detection device
Differential signal detection method has been used to carry out the detection of Partial discharge signal, cable connector built-in capacitance on cable connector capacitance sensor
Reticular structure is used on sensor, both increases area of detection in this way, also reduces capacitance, and in cable connector silicon rubber
It can facilitate installation outside glue-line and in copper shell.Although the detection device can carry out high-voltage cable joint by capacitance sensor
Partial discharge detection.But the partial discharge detection method cannot achieve to the positioning function of rubber layer.In addition, traditional partial discharge detection,
Electromagnetic pulse method or the method for ultrasonic wave are either used, is all the positioning function that cannot be realized to rubber layer.
In addition, the partial discharge detection device only has partial discharge detection sensor and processing unit, detection and processing can only be realized
Function cannot be stored and be shown to partial discharge information, can not realize control function.
Invention content
To overcome above-mentioned traditional condenser type partial discharge detection in the prior art not have the technological deficiency of positioning function, this hair
It is bright that a kind of a kind of high-voltage cable joint partial discharge detection position indicator for realizing partial discharge location function by multiple sensor arrays is provided.
First technical solution of the invention is to achieve the above object：A kind of high-voltage cable joint partial discharge detection positioning
Instrument, including partial discharge capacitance sensor and can be in mounting shell body signal pickup assembly, signal processing apparatus；The signal processing device
It sets and device, control device and data storage device data show by connection；The partial discharge capacitance sensor quantity is extremely
It is less two and places the outside for the insulating layer for being wrapped in tested high-voltage cable joint, each institute using multi-drop arrangement array
Partial discharge capacitance sensor is stated to be electrically connected by independent circuit and the signal pickup assembly respectively.
Preferably, the data storage device is arranged in shell.
In any of the above-described scheme preferably, the data presentation device is display screen.
In any of the above-described scheme preferably, the control device is manual key.
In any of the above-described scheme preferably, the control device is touch screen.
In any of the above-described scheme preferably, the data storage device is storage card.
In any of the above-described scheme preferably, the data storage device is flash memory.
In any of the above-described scheme preferably, it is hard disk to state data storage device.
In any of the above-described scheme preferably, the partial discharge capacitance sensor is arranged using symmetric configuration.
In any of the above-described scheme preferably, the signal pickup assembly is high-speed AD converter.
In any of the above-described scheme preferably, the signal pickup assembly is partial discharge capacitance sensor.
In any of the above-described scheme preferably, the partial discharge capacitance sensor is fabricated to using flexible PCB.
In any of the above-described scheme preferably, the signal processing device is set to microcontroller or microprocessor or scene and can compile
Journey gate array（FPGA）.
In any of the above-described scheme preferably, it is characterised in that signal gathering unit using Fourier transform pairs data into
Row processing, frequency-region signal intensity is found out using FFT, the methods of DFT.
In any of the above-described scheme preferably, signal gathering unit is strong using acquisition signal voltage volt value calculating signal
Degree.
Second technical solution of the present invention is to provide a kind of high-voltage cable joint partial discharge detection localization method, including will be every
One signal pickup assembly is connect by circuit with each partial discharge capacitance sensor；
Partial discharge capacitance sensor is wrapped in using positional symmetry layout outside the insulating layer of high-voltage cable joint；
Partial discharge capacitance sensor is between the insulating layer of high-voltage cable joint and the wrapped copper mesh layers of cable；
The high-voltage cable joint position that partial discharge capacitance sensor measures the partial discharge quantity information of high-voltage cable joint and will measure
Partial discharge quantity information signal pickup assembly is passed to by circuit；
Signal pickup assembly receives the partial discharge quantity information that the partial discharge capacitance sensor measures and passes to signal by circuit
Processing unit；
Signal processing apparatus receives the partial discharge quantity information that the signal pickup assembly is sent and carries out processing and by the office
Portion's discharge capacity information is compared and is shown on data presentation device with the threshold values being stored in the data storage device.
Preferably, then it is more than the maximum of threshold value when the discharge capacity that any partial discharge capacitance sensor measures is more than threshold values
Discharge capacity channel is partial discharge channel, realizes the positioning of partial discharge：
Compared with prior art the advantage of the invention is that：The high-voltage cable joint partial discharge detection position indicator partial discharge detection precision compared with
Height, accurate positioning, safe and reliable, anti-interference ability is stronger.In addition, the high-voltage cable joint partial discharge detection position indicator realizes pair
The partial discharge location of high-voltage cable joint and also overcome due to multiple sensor arrays individual difference and installation difference, can lead
The technological deficiency for causing the measured value of each sensor to there is deviation to easy to produce wrong report.Creative passes through the layout in sensor
Symmetrical cloth arrangement mode is used above, two sensors are set as one group, two corresponding sensors are cancelled out each other sensor
Individual difference.While the place that disappears comes to the Conduction Interference of cable connector.
Description of the drawings
Fig. 1 is the front view that high-tension cable according to the invention mixes one preferred embodiment of partial discharge detection instrument.
Fig. 2 is the schematic diagram that high-tension cable according to the invention mixes partial discharge detection instrument embodiment illustrated in fig. 1.
Fig. 3 is that high-tension cable according to the invention mixes capacitance sensor package in partial discharge detection instrument embodiment illustrated in fig. 1
The dimensional structure diagram of high-voltage cable joint.
Fig. 4 is the main structure diagram that high-tension cable according to the invention mixes partial discharge detection instrument embodiment illustrated in fig. 3.
Fig. 5 is the left view structural representation that high-tension cable according to the invention mixes partial discharge detection instrument embodiment illustrated in fig. 4.
Specific implementation mode
The following discloses the embodiments or embodiment of the subject technology scheme described in a variety of different embodiments.For letter
Change disclosure, the specific example of each element and arrangement is described below.Certainly, these are only example, not to this
Invent protection domain is limited.
According to one or more embodiments, the memory includes computer-readable record/storage medium, such as arbitrary access
Memory（RAM）, read-only memory（ROM）, flash memories, CD, disk, solid-state disk, etc..According to one or more real
Apply example, the controller by be programmed for for execute the microprocessor of one or more operation and/or functions as described herein Lai
It executes.According to one or more embodiments, the controller is wholly or partially executed by the hardware of special configuration.
Embodiment 1：
As shown in Figs. 1-5, a kind of high-voltage cable joint partial discharge detection position indicator, including 1 grade of signal being mounted in shell 1 of shell
Harvester 3, signal processing apparatus 4 and data storage device 4.Signal pickup assembly 3 and signal processing apparatus 4 are in shell 1
Interior upper position, and it is mutually horizontally arranged.The shell is designed using waterproof construction.In the present embodiment, signal processing device
It is microcontroller to set 4.Data storage device 4 is storage card.The storage card is in the lower position in shell 1.Control device 5 is
Manual key.Data presentation device 2 is display screen.The microcontroller by circuit respectively with the storage that is placed in shell 1
Card, the button, the display screen are electrically connected.The display screen is removably bonded on shell 1.Shell 1 is rectangle knot
Structure, between the length of shell 1 is 10-20 centimetres, height is about between 0.5- centimetres.Between width is about 5-10 centimetres.Office
Capacitance sensor 7 is put to be electrically connected by circuit and the microcontroller.In the present embodiment, the quantity of partial discharge capacitance sensor 7
It it is 10, each two partial discharge capacitance sensor 7 is one group, amounts to five groups.The axis of every group of partial discharge capacitance sensor 7 sequence successively
To being distributed on the high-voltage cable joint 8.Each two partial discharge capacitance sensor 7 corresponds ground or is symmetrically wrapped in tested
The outside of the insulating layer 9 of high-voltage cable joint 8 and in high-voltage cable joint 8 copper-clad stratum reticulare 10 in.Specifically, partial discharge electricity
Hold sensor 7 to be between the insulating layer 9 and copper-clad stratum reticulare 10 of the high-voltage cable joint 8.In the present embodiment, partial discharge capacitance
Sensor 7 is made of flexible PCB.Using partial discharge capacitance sensor made of flexible PCB be flexibly fitted in by
It surveys outside the insulating layer of high-voltage cable joint, measurement accuracy is higher.
Embodiment 2：
As shown in Figs. 1-5, a kind of high-voltage cable joint partial discharge detection position indicator, including partial discharge capacitance sensor 7 and fix respectively
Signal pickup assembly 3, signal processing apparatus 4 in shell 1；The signal processing apparatus 4 has number by connection
According to display device 2, control device 5 and data storage device 6；7 quantity at least two of the partial discharge capacitance sensor and use
The setting of multi-drop arrangement array is wrapped in the outside of the insulating layer of tested high-voltage cable joint, each described partial discharge capacitance sensing
Device 7 is electrically connected by independent circuit and the signal pickup assembly 3 respectively.In the present embodiment, the data storage dress
6 settings are set 1 in shell.Data storage device 6 is that the data storage device 6 is flash memory.In the present embodiment, partial discharge capacitance
Sensor 7 is arranged using symmetric configuration.Specifically, the quantity of partial discharge capacitance sensor 7 is four, each two partial discharge capacitance sensing
Device 7 is one group, amounts to two groups.Sequence is distributed on the high-voltage cable joint 8 successively for every group of partial discharge capacitance sensor 7.
Each two partial discharge capacitance sensor 7 corresponds ground or is symmetrically wrapped in the outside of the insulating layer 9 of tested high-voltage cable joint 8
And in the copper-clad stratum reticulare 10 in high-voltage cable joint 8.Partial discharge capacitance sensor 7 is in the exhausted of the high-voltage cable joint 8
Between edge layer 9 and copper-clad stratum reticulare 10.
Embodiment 3：
As shown in Figs. 1-5, a kind of high-voltage cable joint partial discharge detection position indicator, including 1 grade of signal being mounted in shell 1 of shell
Harvester 3, signal processing apparatus 4 and data storage device 4.In the present embodiment, signal processing apparatus 4 is microprocessor.
Data storage device 4 is hard disk.The hard disk is in the lower position in shell 1.Control device 5 is manual key.Data are aobvious
Showing device 2 is tangible formula liquid crystal display.The microprocessor by circuit respectively with the hard disk being placed in shell 1,
The manual key, the tangible formula liquid crystal display are electrically connected.The tangible formula liquid crystal display removably glues
Knot is on shell 1.Partial discharge capacitance sensor 7 is electrically connected by circuit and the microprocessor.In the present embodiment, partial discharge electricity
The quantity for holding sensor 7 is eight, and each two partial discharge capacitance sensor 7 is one group, amounts to 4 groups.Every group of partial discharge capacitance sensing
The axial direction of the sequence successively of device 7 is distributed on the high-voltage cable joint 8.Each two partial discharge capacitance sensor 7 correspond ground or
Symmetrically it is wrapped in the outside of the insulating layer 9 of tested high-voltage cable joint 8 and the copper-clad stratum reticulare 10 in high-voltage cable joint 8
It is interior.Specifically, partial discharge capacitance sensor 7 is between the insulating layer 9 and copper-clad stratum reticulare 10 of the high-voltage cable joint 8.
Embodiment 4：
1. a kind of as shown in Figs. 1-5, high-voltage cable joint partial discharge detection position indicator, including partial discharge capacitance sensor 7 and solid respectively
Signal pickup assembly 3, signal processing apparatus 4 of the Dingan County in shell 1；The signal processing apparatus 4 has by connection
Data presentation device 2, control device 5 and data storage device 6；In the present embodiment, the signal pickup assembly 3 is height
Fast analog-digital converter.7 quantity of partial discharge capacitance sensor is at least one group, and every group includes two partial discharge capacitance sensors 7.Often
Group partial discharge capacitance sensor 7 is arranged using symmetric configuration.In the present embodiment, each two partial discharge capacitance sensor 7 is one group, altogether
Count three groups.Sequence is distributed on the high-voltage cable joint 8 successively for every group of partial discharge capacitance sensor 7.Each two partial discharge electricity
Hold sensor 7 to correspond ground or be symmetrically wrapped in the outside of the insulating layer 9 of tested high-voltage cable joint 8 and be in high pressure
In the copper-clad stratum reticulare 10 of cable connector 8.Partial discharge capacitance sensor 7 is in the insulating layer 9 and copper-clad net of the high-voltage cable joint 8
Between layer 10.In the present embodiment, the signal processing device is set to field programmable gate array（FPGA）.
Embodiment 5：
As shown in Figs. 1-5, a kind of high-voltage cable joint partial discharge detection position indicator, including 1 grade of signal being mounted in shell 1 of shell
Harvester 3, signal processing apparatus 4 and data storage device 4.In the present embodiment, signal processing apparatus 4 is microprocessor.
Data storage device 4 is hard disk.The hard disk is in the lower position in shell 1.5 tangible formula liquid crystal display of control device
Screen.Data presentation device 2 be also be the tangible formula liquid crystal display.The microprocessor by circuit respectively be placed in shell
The hard disk, the tangible formula liquid crystal display in body 1 are electrically connected.The tangible formula liquid crystal display is dismountable
It is bonded on shell 1.Partial discharge capacitance sensor 7 is electrically connected by circuit and the microprocessor.In the present embodiment, described
Signal pickup assembly 3 is multi-channel signal acquiring device.The quantity of partial discharge capacitance sensor 7 is 20, every four partial discharge capacitances
Sensor 7 is one group, amounts to five groups.Five groups of partial discharge capacitance sensors 7 are tactic successively to be wrapped in tested high-tension cable and connects
On first 8.Every group of four partial discharge capacitance sensors 7 be spaced it is symmetrical be wrapped on high-voltage cable joint 8 and be wrapped in high-voltage electricity
Insulating layer 9 outside cable joint 8 contacts.Partial discharge capacitance sensor 7 is in the insulating layer 9 and copper-clad of the high-voltage cable joint 8
Between stratum reticulare 10.
Embodiment 6：
As shown in Figs. 1-5, a kind of high-voltage cable joint partial discharge detection localization method, including each signal pickup assembly 3 is led to
Circuit is crossed to connect with each partial discharge capacitance sensor 7；
Partial discharge capacitance sensor 7 is wrapped in using positional symmetry layout outside the insulating layer 9 of high-voltage cable joint 8；
Partial discharge capacitance sensor 7 is between the insulating layer 9 of high-voltage cable joint 8 and the wrapped copper mesh layers of cable 10；
The high-voltage cable joint 8 that partial discharge capacitance sensor 7 measures the partial discharge quantity information of high-voltage cable joint 8 and will measure
The partial discharge quantity information of position passes to signal pickup assembly 3 by circuit；
Signal pickup assembly 3 receives the partial discharge quantity information that the partial discharge capacitance sensor 7 measures and passes to letter by circuit
Number processing unit 4；
The partial discharge quantity information that signal processing apparatus 4 receives the transmission of the signal pickup assembly 3 carries out processing and will be described
Partial discharge quantity information is compared with the threshold values being stored in the data storage device 6 and is shown in data presentation device
On 2.
It is when the discharge capacity that any partial discharge capacitance sensor 7 measures is more than threshold values, then logical more than the maximum pd quantity of threshold value
Road is partial discharge channel, realizes the positioning of partial discharge：
The above is only the preferred embodiment of the present invention, is not intended to limit the present invention in any form, every according to this
The technical spirit of invention still falls within skill of the present invention to any simple modification, equivalent change and modification made by above example
In the range of art scheme.
After having read this specification, those skilled in the art are not difficult to find out, the present invention is bonded by the prior art, this
Some give detailed description to the prior art of a little each sections for constituting the present invention herein, some then concisely consider for specification
Do not repeat all matters, big and small, but those skilled in the art read specification after just know institute's cloud.And those skilled in the art
Also it is not difficult to find out, is to be full of a large amount of creative works to the combination of these prior arts to constitute the present invention, is that inventor is more
The crystallization of year theory analysis and many experiments.Those skilled in the art can equally find out from specification, described herein
The arbitrary combination of each technical solution and each feature belongs to the part of the present invention.
Claims (10)
1. a kind of high-voltage cable joint partial discharge detection position indicator, including partial discharge capacitance sensor and the signal that can be mounted in shell
Harvester, signal processing apparatus；It is characterized in that：The signal processing apparatus by connection data show device,
Control device and data storage device；It the partial discharge capacitance sensor quantity at least two and is put using multi-drop arrangement array
The outside for the insulating layer for being wrapped in tested high-voltage cable joint is set, each described partial discharge capacitance sensor is respectively by independent
Circuit is electrically connected with the signal pickup assembly.
2. high-voltage cable joint partial discharge detection position indicator as described in claim 1, it is characterised in that：The data storage device
It is arranged in shell.
3. high-voltage cable joint partial discharge detection position indicator as claimed in claim 1 or 2, it is characterised in that：The data are shown
Device is display screen.
4. high-voltage cable joint partial discharge detection position indicator as claimed in claim 1 or 2, it is characterised in that：The control device
For manual key.
5. high-voltage cable joint partial discharge detection position indicator as claimed in claim 1 or 2, it is characterised in that：The control device
For touch screen.
6. high-voltage cable joint partial discharge detection position indicator as claimed in claim 1 or 2, it is characterised in that：The data storage
Device is storage card.
7. high-voltage cable joint partial discharge detection position indicator as claimed in claim 1 or 2, it is characterised in that：The data storage
Device is flash memory.
8. high-voltage cable joint partial discharge detection position indicator as claimed in claim 1 or 2, it is characterised in that：State data storage dress
It is set to hard disk.
9. high-voltage cable joint partial discharge detection position indicator as described in claim 1, it is characterised in that：The partial discharge capacitance sensing
Device is arranged using symmetric configuration.
10. a kind of high-voltage cable joint partial discharge detection localization method, including by each signal pickup assembly by circuit and often
One partial discharge capacitance sensor connection, it is characterised in that：
Partial discharge capacitance sensor is wrapped in using positional symmetry layout outside the insulating layer of high-voltage cable joint；
Partial discharge capacitance sensor is between the insulating layer of high-voltage cable joint and the wrapped copper mesh layers of cable；
The high-voltage cable joint position that partial discharge capacitance sensor measures the partial discharge quantity information of high-voltage cable joint and will measure
Partial discharge quantity information signal pickup assembly is passed to by circuit；
Signal pickup assembly receives the partial discharge quantity information that the partial discharge capacitance sensor measures and passes to signal by circuit
Processing unit；
Signal processing apparatus receives the partial discharge quantity information that the signal pickup assembly is sent and carries out processing and by the office
Portion's discharge capacity information is compared and is shown on data presentation device with the threshold values being stored in the data storage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810226618.8A CN108459247A (en) | 2018-03-19 | 2018-03-19 | A kind of high-voltage cable joint partial discharge detection position indicator and partial discharge detection localization method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810226618.8A CN108459247A (en) | 2018-03-19 | 2018-03-19 | A kind of high-voltage cable joint partial discharge detection position indicator and partial discharge detection localization method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110045241A (en) * | 2019-04-18 | 2019-07-23 | 中国电力科学研究院有限公司 | A kind of method and system for the capacitive coupling partial discharge detection to high-voltage crosslinking sea cable factory connector |
| CN111103515A (en) * | 2019-12-10 | 2020-05-05 | 国网上海市电力公司 | Built-in cable partial discharge detection device and method |
| WO2020177158A1 (en) * | 2019-03-01 | 2020-09-10 | 浙江新图维电子科技有限公司 | Resonant mutual inductance partial discharge detection device and detection method for cable joint |
| CN111754748A (en) * | 2020-05-28 | 2020-10-09 | 中山市惠丰达电气设备有限公司 | Ultrasonic wave partial discharge breakdown positioning system |
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