CN106093716A - Local discharge of electrical equipment detection device - Google Patents
Local discharge of electrical equipment detection device Download PDFInfo
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- CN106093716A CN106093716A CN201610363340.XA CN201610363340A CN106093716A CN 106093716 A CN106093716 A CN 106093716A CN 201610363340 A CN201610363340 A CN 201610363340A CN 106093716 A CN106093716 A CN 106093716A
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- electrical equipment
- local discharge
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- detection device
- discharge
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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 local discharge of electrical equipment detection device, described device includes detecting the D dot sensor of local discharge of electrical equipment, local discharge signal that described D dot sensor detected is filtered and the signal processing module of noise reduction process, the discharge signal acquisition module that is acquired described local discharge signal and shows, the signal output part of described D dot sensor connects the input of described signal processing module, and the outfan of described signal processing module connects the input of described discharge signal acquisition module.Said apparatus not only has the features such as simple in construction, volume is little, be easy to carry, simultaneously, owing to D dot sensor and tested electrical equipment end are without there being physical contact, therefore the insulating properties of tested electrical equipment are affected little by local discharge of electrical equipment detection device self so that local discharge of electrical equipment detection device has that Partial Discharge Detection is highly sensitive, the feature of good directionality, fast response time.
Description
Technical field
The present invention relates to technical field of power systems, particularly relate to a kind of local discharge of electrical equipment detection device.
Background technology
Along with being skyrocketed through of China's power consumption, electrical network scale constantly increases, and electric pressure also steps up.Guarantee electrically
The insulation safety of equipment is the important prerequisite safeguarding power grid operation.In transmission system, transformator is as the core of most critical
Heart equipment, its state of insulation is most important to the safe operation of electrical network.Generally, the preventive experiment of transformator and maintenance
Can periodically find the deterioration of its state of insulation, thus prevent the accident occurred because of failure of insulation, but this preventive experiment
Not only there is the problem of ageing deficiency with maintenance, and experiment itself also also has infringement to insulation to a certain extent.In recent years
Come, electrical equipment is carried out online status monitoring, the state of insulation information of real-time collecting electrical equipment, and carry out reliability
Analysis and evaluation, have become as a kind of make up preventive experiment and the deficiency of maintenance, detection insulation of electrical installation performance important
Technological means.
Shelf depreciation is a kind of under electric field action, and in insulation system, only subregion occurs electric discharge and do not extends through Jie
The electric discharge phenomena of matter.Shelf depreciation makes the long-time breakdown voltage of electrolyte usually less than the part of short-time breakdown voltage, because of
This is considered as the one of the main reasons causing Electric Power Equipment Insulation to damage all the time.At present, seal due to inside transformer
And structure is complicated, during operation, interior oil paper insulation structure bears the highest electric field intensity, and is among the environment of high temperature, is used for
The built-in measurement apparatus of the Partial Discharge Detection equipment of on-line monitoring is not only difficult to bear high temperature for a long time, easily loses efficacy, and
The existence of built-in measurement apparatus self often affects the insulation system of transformator, and then affects the state of insulation of transformator, because of
This, be currently based on the Partial Discharge Detection equipment not only installation process complexity of built-in measurement apparatus, installation difficulty greatly, and can be right
The insulation system of transformator impacts, and affects the state of insulation of transformator.
Summary of the invention
Based on this, it is necessary to the peace existed for Partial Discharge Detection equipment based on built-in measurement apparatus in prior art
The problem that dress difficulty is big, can affect the insulation system of electrical equipment, it is provided that a kind of local discharge of electrical equipment detection device.
For solving above-mentioned technical problem, the present invention takes following technical scheme:
A kind of local discharge of electrical equipment detection device, this device includes that the D-dot detecting local discharge of electrical equipment passes
Sensor, the local discharge signal described D-dot sensor being detected is filtered and the signal processing module of noise reduction process, right
The discharge signal acquisition module that described local discharge signal is acquired and shows,
The signal output part of described D-dot sensor connects the input of described signal processing module,
The outfan of described signal processing module connects the input of described discharge signal acquisition module.
Above-mentioned local discharge of electrical equipment detection device, based on contactless detection mode, utilizes the frequency with non-constant width
The D-dot sensor of rate response range and higher sensitivity is as the sensor of detection local discharge of electrical equipment, due to D-dot
Sensor has good transient characterisitics, therefore, it is possible to accurate response goes out the reason such as insulation degradation in transformator and the local that causes
Electric discharge, is filtered and noise reduction process the local discharge signal that D-dot sensor detects by signal processing module, is entering
After one step improves the quality of local discharge signal, by discharge signal acquisition module local discharge signal it is acquired and shows
Show, thus realize the detection to local discharge of electrical equipment signal, local discharge of electrical equipment detection dress proposed by the invention
Put except having that Partial Discharge Detection is highly sensitive, in addition to the feature of good directionality, fast response time, also there is simple in construction, body
Long-pending little, detachable, the feature such as be easy to carry, simultaneously as D-dot sensor and tested electrical equipment end are without there being physics to connect
Touching, therefore the insulating properties of tested electrical equipment are affected little by local discharge of electrical equipment detection device self, will not give tested
Electrical equipment end brings insulation hidden danger, does not also interfere with the normal work of tested electrical equipment end.
Accompanying drawing explanation
Fig. 1 is the structural representation of local discharge of electrical equipment detection device in one of them embodiment of the present invention；
Fig. 2 is equivalent circuit diagram during D-dot working sensor in the present invention；
Fig. 3 is the front view of D-dot sensor in one of them detailed description of the invention of the present invention；
Fig. 4 is the top view of D-dot sensor cross-section in one of them detailed description of the invention of the present invention；
Fig. 5 is the experimental circuit in the present invention；
Fig. 6 is the local discharge signal utilizing local discharge of electrical equipment detection device to record in the present invention；
Fig. 7 is the local discharge signal that in the present invention, pulse current method records；
Fig. 8 is the shelf depreciation letter utilizing local discharge of electrical equipment detection device and pulse current method to record in the present invention
The comparison diagram of number peak-to-peak value.
Detailed description of the invention
Below in conjunction with accompanying drawing and preferred embodiment, technical scheme is described in detail.
Wherein in an embodiment, shown in Figure 1, a kind of local discharge of electrical equipment detection device, this device bag
The D-dot sensor 100 including detection local discharge of electrical equipment, local discharge signal D-dot sensor being detected are carried out
The discharge signal collection mould filtering the signal processing module 200 with noise reduction process, local discharge signal being acquired and shows
Block 300, the signal output part of D-dot sensor 100 connects the input of signal processing module 200, signal processing module 200
Outfan connects the input of discharge signal acquisition module 300.
In the present embodiment, when the inside of tested electrical equipment creates shelf depreciation, it is arranged at tested electrical equipment
D-dot sensor 100 that is neighbouring and that remain stationary as will be by electromagnetic wave induction produced by tested local discharge of electrical equipment
Go out corresponding local discharge signal, owing to there is no direct physical contact between D-dot sensor 100 and tested electrical equipment,
But realize the measurement to tested local discharge of electrical equipment by the change of electric field, therefore D-dot sensor 100 will not be to quilt
The state of insulation surveying electrical equipment produces impact, input side will not be produced impact.Equivalence when D-dot sensor 100 works
Circuit as in figure 2 it is shown, in fig. 2, CLThe space electric capacity between source V and sensor, C is put for officeGFor sensor direct-to-ground capacitance, iL、
iS、iGIt is respectively each branch current, V0For output voltage values.The signal V that sensor recordsSBy resistance RSIt is delivered to discharge signal
Acquisition module, it and the characteristic impedance Z of coaxial cable0Together constitute load resistance R.As R (CL+CG) ＜ ＜ τr(τrFor tested
The forward position of signal) time CGCan regard open circuit as, now probe is operated under the Pattern of Differential, and output signal is
The local discharge signal detected is sent to signal processing module 200, signal processing mould by D-dot sensor 100
Local discharge signal is filtered and noise reduction process by block 200, thus improves the quality of local discharge signal further, specifically
Ground, owing to the frequency band range of D-dot sensor 100 is wider, and the local discharge signal of electrical equipment is often in higher frequency
Band scope, therefore, in order to remove the unwanted low frequency coupled signals such as power frequency, signal processing module 200 need to be to D-dot sensor
100 local discharge signals sended over are filtered processing, to filter low frequency signal, and reserved high-frequency signal；Simultaneously as it is electric
The working environment of gas apparatus local discharge detection device is complicated and changeable, inevitably introduces during Partial Discharge Detection
The noise of certain magnitude, it is therefore desirable to filtered local discharge signal is carried out noise reduction process, thus is conducive to obtaining quality
More excellent local discharge signal.
As a kind of specific embodiment, signal processing module 200 includes high pass filter and the small echo being sequentially connected with
Denoising module, wherein high pass filter is the wave filter that band connection frequency is more than 50MHz, and the input of high pass filter connects D-
The signal output part of dot sensor 100, the outfan of Wavelet Denoising Method module connects the input of discharge signal acquisition module 300.
In the signal processing module 200 of present embodiment, band connection frequency is utilized to be more than 50MHz high pass filter to D-dot sensor
100 local discharge signals sended over are filtered processing, thus filter the low frequency signal in local discharge signal, and utilize
Wavelet Denoising Method module carries out noise reduction process to filtered local discharge signal, owing to Wavelet Denoising Method has low entropy, differentiates more
Characteristic, decorrelation and select base motility, be highly suitable for processing non-stationary signal, the therefore signal processing in present embodiment
Module 200 utilizes Wavelet Denoising Method module to carry out noise reduction process, is conducive to making the signal of the final gained of discharge signal acquisition module 300
Figure becomes apparent from, and more conforms to practical situation during tested electrical equipment generation shelf depreciation.Present embodiment utilizes high pass
Wave filter and Wavelet Denoising Method module realize the signal processing to local discharge signal, further increase the matter of local discharge signal
Amount, is analyzed laying a good foundation to local discharge of electrical equipment for the follow-up characteristic according to local discharge signal.
Through signal processing module 200, local discharge signal is filtered and after noise reduction process, signal processing module 200
Local discharge signal after processing sends to discharge signal acquisition module 300, and discharge signal acquisition module 300 gathers local and puts
The signal of telecommunication, and the signal gathered is shown and stores, thus the shelf depreciation that ancillary staff is to tested electrical equipment
Situation more gets information about and recognizes.Discharge signal acquisition module 300 is capable of the collection to local discharge signal
And display, it can be signals collecting/display device of the prior art or device, as the optional embodiment party of one of which
Formula, discharge signal acquisition module 300 is any one in oscillograph or Partial discharge detector, when discharge signal gathers mould
When block 300 is oscillograph, oscillograph is capable of the collection to local discharge signal and display in real time, has frequency response range
Wide, the time dependent waveform of voltage can be shown visually and frequency and the isoparametric feature of phase place can be measured；Shelf depreciation is examined
Surveying instrument is then that a kind of shelf depreciation with stronger practicality being widely used in electrical equipment real time monitoring field is surveyed
Test instrument, it is particularly well-suited to the application in engineering, when discharge signal acquisition module 300 is Partial discharge detector, locally
Local discharge signal after the process that signal processing module 200 sends over can be acquired by discharge detector, and will adopt
Collect to data show in real time and store, and after suitably calibration, it is possible to the generation of direct-reading tested electrical equipment is locally put
The discharge capacity of discharge pulse during electricity, and pointer header and digital gauge outfit can show have the high spy of detection sensitivity simultaneously
Point, its practicality and adaptability are the strongest.
Local discharge of electrical equipment detection device in the present embodiment has non-based on contactless detection mode, utilization
The frequency response range of constant width and the D-dot sensor of higher sensitivity as the sensor of detection local discharge of electrical equipment,
Owing to D-dot sensor has good transient characterisitics, therefore, it is possible to accurate response go out the reason such as insulation degradation in transformator and
The shelf depreciation caused, is filtered the local discharge signal that D-dot sensor detects by signal processing module and drops
Make an uproar process, after further increasing the quality of local discharge signal, by discharge signal acquisition module to local discharge signal
It is acquired and shows, thus realizing the detection to local discharge of electrical equipment signal, electrical equipment office proposed by the invention
Portion's discharging detection device, except having that Partial Discharge Detection is highly sensitive, in addition to the feature of good directionality, fast response time, also has
The features such as simple in construction, volume are little, be easy to carry, simultaneously as D-dot sensor and tested electrical equipment end are without there being physics
Contact, therefore the insulating properties of tested electrical equipment are affected little by local discharge of electrical equipment detection device self, will not give quilt
Survey electrical equipment end and bring insulation hidden danger, also do not interfere with the normal work of tested electrical equipment end.
As a kind of specific embodiment, the D-dot sensor in local discharge of electrical equipment detection device includes base
Seat, be arranged on pedestal and be set to earthy shell, be arranged on shell formed cavity in inner core, be arranged at inner core
In inner core, insulating element, be provided with the opening corresponding with inner core position and fix the cover being connected with shell and be arranged in
Opening the joint being tightly connected with cover, one end of inner core is connected with inner core, and the other end of inner core is connected with the copper pin of joint
And insulated with cover by insulating element, the heart yearn of joint is connected with the input of signal processing module by coaxial cable.Tool
Body ground, sees Fig. 3 and Fig. 4, and wherein Fig. 3 show the front view of D-dot sensor, and Fig. 4 show D-dot sensor cross-section
Top view, in figure 3, D-dot sensor is the structure with same shape shaft, and it includes shell 1, inner core 2, pedestal 3, absolutely
Edge part 4, cover 5, joint 6 and inner core 8, wherein, shell 1 is set to earth potential and is arranged on pedestal 3, forms chamber
Body, inner core 2 is arranged in this cavity, and inner core 8 is arranged in inner core 2, and cover 5 is provided with the opening corresponding with inner core 8 position,
And cover 5 is fixing with shell 1 to be connected, and joint 6 is arranged in the opening on cover 5 and is tightly connected with cover 5 by this opening,
Such as, an opening is offered in position corresponding with inner core 8 on cover 5, and the diameter of this opening is bigger than the diameter of joint 6 and energy
Reaching and the outer conductor airtight connection of joint 6, one end of inner core 8 is connected with the inner side of inner core 2, the other end of inner core 8 and joint 6
Copper pin connects, and the other end of inner core 8 is insulated with cover 5 by insulating element 4, the heart yearn of joint 6 by coaxial cable and
The input of signal processing module connects.In the present embodiment, inner core 2 and inner core 8 are as signal receiving end, the core of joint 6
Line is as signal output part, and owing to shell 1 is set to earth potential, cover 5 is connected with shell 1, and the two is conducted mutually, therefore cylinder
Lid 5 is set to earth potential, and the outer conductor by opening with the joint 6 of cover 5 airtight connection is earth potential too simultaneously.
Additionally, D-dot sensor could be included for the metal connecting piece 9 fixing with other devices or equipment, inner core 2 and inner core
Air layer 7 is had between 8.Present embodiment ultimate principle based on voltage sensor, in conjunction with local discharge of electrical equipment detection
Practical situation, provides the concrete structure of D-dot sensor, by the enforcement of this detailed description of the invention, for the local of electrical equipment
The detection of electric discharge provides relevant detection device and detection means.
As a kind of specific embodiment, D-dot sensor also includes insulating barrier, and this insulating barrier is filled in shell with interior
Between Tong, to ensure the insulating properties of the inner core in inner core and inner core.The insulating properties of the insulating barrier normal work to D-dot sensor
Make there is a highly important impact, and the material of insulating barrier has conclusive effect, as one for the insulating properties of insulating barrier
Planting optional embodiment, the material of insulating barrier is epoxy resin, and the relative dielectric constant of epoxy resin is 5.2, asphalt mixtures modified by epoxy resin
Fat material has the spies such as cohesiveness is big, adhesive force is strong, compliance is good, excellent heat cure performance and stable chemical resistance
Point, epoxy resin the insulating part being prepared from not only has good electrical insulation properties, and it is strong to be generally also provided with machinery
Degree is high, arc resistance is strong, compactness is high, any surface finish, thermostability and the tolerance to cold advantage such as preferably, and therefore present embodiment is with phase
To the epoxy resin that dielectric constant is 5.2 as insulating barrier, it is filled between shell and the inner core of D-dot sensor, fully protects
The insulating properties of card D-dot sensor, the concrete numerical value of the relative dielectric constant of its epoxy resin can be according to actual D-dot
Electric field intensity that sensor is subjected to and specifically set, the relative dielectric constant of epoxy resin is set as 5.2 by present embodiment
It is to set for the satisfied demand that generally local discharge of electrical equipment is detected by D-dot sensor.
As a kind of specific embodiment, in D-dot sensor, shell be shaped as cylindrical shape, and the wall of shell
A height of 22mm, the internal diameter of shell is 22mm, and the internal diameter of inner core is 17mm, and being shaped as of inner core is cylindric, and inner core is a diameter of
6mm, a length of 20mm.Present embodiment gives the supporting shell of D-dot sensor, inner core and the size of inner core, according to this
Dimensional parameters given by embodiment prepares D-dot sensor, and not only preparation technology is simple, and can effectively change circuit
Direct-to-ground capacitance, keep D-dot sensor the Pattern of Differential working condition, thus improve local discharge of electrical equipment detection device
Output effect to different local discharge signals, the most also the realization for local discharge of electrical equipment detection device has provided
The reference data being worth.
As a kind of specific embodiment, the material of the shell of D-dot sensor is any one in copper, ferrum or aluminum
Kind, and shell is screwed with cover and is connected, such as shell be shaped as class annular, installation is left in the centre of shell
The cavernous structure of inner core, cover be shaped as annular, the diameter of cover is more slightly larger than the aperture of shell, and cover is provided with 4 screws
Installing port, shell and cover be connected so that screw is fixing by screw installing port, thus convenient dismantle, here D-dot sensor
The material of shell can be any one in the conducting metals such as copper, ferrum or aluminum, it is also possible to for the gold that other electric conductivity are good
Belong to, such as gold, silver etc..
As a kind of specific embodiment, the material of the inner core of D-dot sensor is copper, and inner core be shaped as cylinder
Shape, using copper as the inner core of D-dot sensor, not only ensure that the electric conductivity that inner core is good, and the preparation letter of columned inner core
Single, reduce the cost of D-dot sensor.
As a kind of specific embodiment, the joint of D-dot sensor is Q9 adapter BNC male, and Q9 adapter is
The coaxial cable connector of conventional model in a kind of prior art, such as welded fitting etc., using Q9 adapter BNC male as
The joint of D-dot sensor can respond effect to realize the more excellent signal of sensor.
For further illustrating effectiveness and the feasibility of local discharge of electrical equipment detection device proposed by the invention, under
Same office is put model carry out simultaneously with pulse current method and the local discharge of electrical equipment detection device of national regulations by face respectively
Measure, to verify the performance of local discharge of electrical equipment signal supervisory instrument proposed by the invention.Specific experiment circuit diagram is such as
Shown in Fig. 5, in this experimental circuit, including alternating current power supply 10, pressure regulator 11, testing transformer 12, protective resistance 13, coupling
Electric capacity 14, shelf depreciation test product 15, detects impedance 16, D-dot sensor 17, signal processing module 18 and discharge signal and gathers mould
Block 19, shelf depreciation test product 15 simulates the shelf depreciation of electrical equipment, and it is attached that D-dot sensor 17 is arranged at shelf depreciation test product 15
Closely, the shelf depreciation of shelf depreciation test product 15 under the conditions of test experience, and the local discharge signal detected is sent to
Signal processing module 18 and discharge signal acquisition module 19 process accordingly.Based on above-mentioned experimental circuit, utilize and electrically set
The local discharge signal that standby local discharge detection device records as shown in Figure 6, is surveyed according to the pulse current method of national regulations simultaneously
The local discharge signal obtained is as it is shown in fig. 7, be utilized respectively shelf depreciation test product under above two method repetitive measurement different condition
The local discharge signal of 15, the ratio relation of the peak-to-peak value of contrast above two method gained multiple pulses signal, and to data
Carry out once fitting, obtain the local discharge of electrical equipment that utilizes as shown in Figure 8 and detect that device records and utilize pulse current
The comparison diagram of the local discharge signal peak-to-peak value that method records, the abscissa in Fig. 8 is (single for recording peak-to-peak value according to pulse current method
Position is V), vertical coordinate records peak-to-peak value (unit is V), as shown in Figure 8, gained for utilizing local discharge of electrical equipment detection device
The determination coefficient of matching is 0.9919, shows that the measurement result linear correlation degree of above two measuring method is good, it can be seen that,
The measurement result utilizing local discharge of electrical equipment detection device to obtain is close with the measurement result utilizing pulse current method, card
Bright local discharge of electrical equipment detection device has higher certainty of measurement and accuracy.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, not to above-mentioned reality
The all possible combination of each technical characteristic executed in example is all described, but, as long as the combination of these technical characteristics is not deposited
In contradiction, all it is considered to be the scope that this specification is recorded.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, but also
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that, come for those of ordinary skill in the art
Saying, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a local discharge of electrical equipment detection device, it is characterised in that include the D-dot detecting local discharge of electrical equipment
Sensor, the local discharge signal described D-dot sensor being detected is filtered and the signal processing module of noise reduction process,
The discharge signal acquisition module described local discharge signal being acquired and show,
The signal output part of described D-dot sensor connects the input of described signal processing module,
The outfan of described signal processing module connects the input of described discharge signal acquisition module.
Local discharge of electrical equipment the most according to claim 1 detection device, it is characterised in that
Described signal processing module includes high pass filter and the Wavelet Denoising Method module being sequentially connected with, and described high pass filter is logical
The wave filter of 50MHz it is more than with frequency,
The input of described high pass filter connects the signal output part of described D-dot sensor, described Wavelet Denoising Method module
Outfan connects the input of described discharge signal acquisition module.
Local discharge of electrical equipment the most according to claim 1 and 2 detection device, it is characterised in that
Described discharge signal acquisition module is oscillograph or Partial discharge detector.
Local discharge of electrical equipment the most according to claim 1 and 2 detection device, it is characterised in that
Described D-dot sensor includes pedestal, be arranged on described pedestal and be set to earthy shell, be arranged on described
Shell formed cavity in inner core, the inner core being arranged in described inner core, insulating element, be provided with relative with described inner core position
The opening answered and fix with described shell the cover being connected and be arranged in described opening and with connecing that described cover is tightly connected
Head,
One end of described inner core is connected with described inner core, and the other end of described inner core is connected with the copper pin of described joint and by absolutely
Edge part insulate with described cover,
The heart yearn of described joint is connected with the input of described signal processing module by coaxial cable.
Local discharge of electrical equipment the most according to claim 4 detection device, it is characterised in that
Described D-dot sensor also includes that insulating barrier, described insulating barrier are filled between described shell and described inner core.
Local discharge of electrical equipment the most according to claim 5 detection device, it is characterised in that
The material of described insulating barrier is epoxy resin, and the relative dielectric constant of described epoxy resin is 5.2.
Local discharge of electrical equipment the most according to claim 4 detection device, it is characterised in that
Described shell be shaped as cylindrical shape, and a height of 22mm of wall of described shell, the internal diameter of described shell is 22mm,
The internal diameter of described inner core is 17mm,
Being shaped as of described inner core is cylindric, and a diameter of 6mm of described inner core, a length of 20mm.
Local discharge of electrical equipment the most according to claim 4 detection device, it is characterised in that
The material of described shell is any one in copper, ferrum or aluminum, and described shell is screwed with described cover
Connect.
Local discharge of electrical equipment the most according to claim 4 detection device, it is characterised in that
The material of described inner core is copper, and being shaped as of described inner core is cylindric.
Local discharge of electrical equipment the most according to claim 4 detection device, it is characterised in that
Described joint is Q9 adapter BNC male.
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| CN201610363340.XA CN106093716A (en) | 2016-05-26 | 2016-05-26 | Local discharge of electrical equipment detection device |
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| CN201610363340.XA CN106093716A (en) | 2016-05-26 | 2016-05-26 | Local discharge of electrical equipment detection device |
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| CN111208467A (en) * | 2020-02-19 | 2020-05-29 | 鑫鸿瑞科技(深圳)有限公司 | Remote control type partial discharge signal source and method for simulating partial discharge |
| CN111208467B (en) * | 2020-02-19 | 2022-04-19 | 鑫鸿瑞科技(深圳)有限公司 | Remote control type partial discharge signal source and method for simulating partial discharge |
| CN117554768A (en) * | 2024-01-12 | 2024-02-13 | 广州南网科研技术有限责任公司 | Cable accessory partial discharge monitoring method |
| CN117554768B (en) * | 2024-01-12 | 2024-03-15 | 广州南网科研技术有限责任公司 | Cable accessory partial discharge monitoring method |
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Application publication date: 20161109 |