CN104833868B - High s/n ratio pressure wave method model cable space charge test system - Google Patents
High s/n ratio pressure wave method model cable space charge test system Download PDFInfo
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- CN104833868B CN104833868B CN201510218716.3A CN201510218716A CN104833868B CN 104833868 B CN104833868 B CN 104833868B CN 201510218716 A CN201510218716 A CN 201510218716A CN 104833868 B CN104833868 B CN 104833868B
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Abstract
The present invention discloses a kind of high s/n ratio pressure wave method model cable space charge test system, protective resistance（16）, model cable（18）, electric capacity（19）It is arranged on metallic shield case（20）It is interior, DC generator（11）, high-voltage connection（12）, protective resistance（16）It is linked in sequence successively, high-voltage connection（12）Through the metallic shield case（20）Tank wall, the waveguide（14）It is arranged on high-voltage connection（12）At the tank wall of entrance, the high-voltage connection（12）Middle series connection goes to disturb resistance（15）；Going to disturb resistance（15）After outer layer covers tack insulating tape, wrapped cable stress cone（13）；The present invention can greatly reduce influence of the external interference signals to space charge test system, and significantly improve system signal noise ratio by installing waveguide in high-voltage connection entrance, being connected in lead and remove interference resistance, using measures such as metallic shield casees.
Description
Technical field
The invention belongs to model cable space charge technical field of measurement and test, and in particular to be surveyed for model cable space charge
The high s/n ratio pressure wave method model cable space charge test system of examination.
Background technology
Under direct current high electric field, the subject matter that direct current cables faces be in dielectric or interface on can accumulate certain
Space charge, if space charge density is sufficiently high, internal field causes possibly even beyond the breakdown electric field of dielectric
Dielectric breakdown.Space charge measuring technology, including electroacoustic pulse（Pulsed electro-acoustic, PEA）Method, pressure wave
（Pressure wave propagation, PWP）Method etc., has effectively promoted the research of space charge.It is presently used for space
The cable insulation thickness of electric charge test is 2 ~ 6 mm, referred to as model cable, and the test of model cable space charge is usually used
Method be PEA methods.
In the test of PEA methods, plus high-pressure electric pulse can not possibly be too high, therefore test signal is smaller.In addition, in order to obtain
Accurate electric impulse signal, need to use the PVDF piezoelectric membranes in broadband, but the sensitivity of this sensor is not high.So one
As in the case of the obtained signal of additional single electric pulse be difficult to analysis, it usually needs additional hundreds of to thousands of electricity arteries and veins
Punching, processing is then averaged to measured signal can just obtain space charge signal.Meanwhile, insulated in model cable empty
Between in electric charge test process, because signal attenuation is larger, also need to carry out data processing to fundamental space charge signal using software,
Space charge research can be used for.So, in the test of model cable space charge, the data that PEA methods are surveyed exist certain
Randomness, and there is certain distorted signals.In addition, the temperature in use of pvdf membrane is limited to, in the test of PEA method test systems
Temperature is general below 70 DEG C, but the need for being due to research, it is often necessary to sky of the test model cable insulation more than 70 DEG C
Between charge character.So, in test temperature this link, there is certain limitation in PEA methods.
The content of the invention
The present invention proposes a kind of high s/n ratio pressure wave method model cable space charge test system, realizes PWP method moulds
Type cable space charge is tested, and signal is stronger, and the real reliability of test signal, no temperature limitations can significantly improve letter
Make an uproar and compare, improve testing reliability.
Technical solution of the present invention is as follows：
Pressure wave method model cable space charge test system, it is characterised in that including DC generator, high-voltage connection,
Stress cone, waveguide, go interference resistance, protective resistance, model cable, electric capacity, metallic shield case, pulse laser, amplifier,
Oscillograph and grading ring.
Protective resistance, model cable, electric capacity are arranged in metallic shield case, and high-voltage connection passes through the metallic shield case
Tank wall, the waveguide is arranged at the tank wall of high-voltage connection entrance, and series connection goes to disturb resistance in the high-voltage connection；Going to do
Disturb after resistive outer skin parcel tack insulating tape, wrapped cable stress cone；DC generator, high-voltage connection are connected；High pressure is drawn
Between line and protective resistance, connected respectively by grading ring between protective resistance and model cable, electric capacity.
Model cable includes the first connection end close to protective resistance, interlude and the second connection away from protective resistance
End, first connection end and the second connection end are the two ends for the model cable for peeling off certain length out semiconductor layer.
First connection end of model cable connects electric capacity by grading ring, and electric capacity, amplifier, oscillograph sequentially connect successively
Connect；Second connection end connection grading ring sky connects.
Setting pulse laser, the transmitting light of pulse laser at unthreaded hole, unthreaded hole are provided with the tank wall of metallic shield case
It can be radiated at by unthreaded hole on model cable.
The interlude of model cable is grounded by metal fixture, wire connection.
The inside and outside semiconductive shielding layer thickness of model cable is 0.8 ~ 1.2mm.
Insulation thickness is 2 ~ 6 mm；
The strip length of first connection end and the second connection end is 300 ~ 400 mm；Middle segment length is 60 ~ 200 mm.
The BNC connector on tank wall that electric capacity passes through metallic shield case is connected with amplifier.
Go to disturb the resistance value of resistance to be the M Ω of 1000 Ω ~ 10.Go the wave impedance for disturbing resistance to be much larger than high-voltage connection, energy
Greatly reduce the external interference signals introduced by high-voltage connection.
Protective resistance is that resistance value is the G Ω of 200 M Ω ~ 2.Protective resistance not only can guard amplifier and oscillograph, moreover it is possible to
Remove DC generator and produce interference of the ripple voltage to test signal.
BNC connector is connected by double layer screen signal wire with amplifier.
Amplifier is connected with oscillograph by signal wire.
The kV of pressure voltage 150 ~ 200 of electric capacity, the nF of electric capacity 0.5 ~ 2.Electric capacity is by high direct voltage and secondary device（Amplifier and
Oscillograph）Isolation, and preferably coupled room charge signal.
Protective resistance, electric capacity, model cable etc. are shielded and prevented from extraneous electromagnetic interference by metallic shield case
Signal.
Between high-voltage connection and protective resistance, between protective resistance and model cable, electric capacity, the second connection end sky place of connecing is
It is respectively arranged with grading ring.High-pressure uniform can be distributed in around component by grading ring, it is ensured that electric discharge is not present in each tie point position
Phenomenon.
Compared with prior art, the present invention includes following beneficial effect：
（1）There is provided the specific configuration of PWP method model cable space charge test systems；
（2）By installing waveguide in high-voltage connection entrance, being connected in lead and remove interference resistance, using metallic shield case
Deng measure, influence of the external interference signals to space charge test system can be greatly reduced, and significantly improve system signal noise ratio；
(2) PWP methods model cable space charge test system signal is stronger, solves PEA method model cable space charges
Test system signal is weaker and the problem of relatively low signal to noise ratio；
(3) PWP methods model cable space charge test system only needs to test the space charge letter that can be once stablized
Number, solve PEA method model cable space charge test systems need to repeat hundreds of times even thousands of time tests and exist with
Machine sex chromosome mosaicism, it is ensured that the real reliability of test signal；
(4) PWP methods model cable space charge test system can be used for more than 70 DEG C of space charge test, solve
Limitation of the PEA methods test temperature below 70 DEG C；
(5) resistance, electric capacity, sample are shielded using metallic shield case, greatly reduces outer bound pair test system
Electromagnetic interference；
(6) resistance of high-voltage connection conductor series connection one, and resistance be located at metallic shield case tank wall at, reduce by high-voltage connection
The external electromagnetic interference of introducing, improves the signal to noise ratio of system.
Brief description of the drawings
Fig. 1 is the structural representation of pressure wave method model cable space charge test system of the present invention；
Fig. 2 is not add waveguide and go to disturb the interference signal waveform of resistance；
Fig. 3 is to add waveguide and go to disturb the interference signal waveform of resistance；
Fig. 4 is the structural representation of model cable；
Fig. 5 be high-voltage connection, stress cone, waveguide, go disturb resistance attachment structure detailed schematic.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, pressure wave method model cable space charge test system, it is characterised in that including DC generator
11st, high-voltage connection 12, stress cone 13, waveguide 14, go interference resistance 15, protective resistance 16, model cable 18, electric capacity 19, gold
Belong to shielded box 20, pulse laser 21, amplifier 22, oscillograph 23 and grading ring 30.
As shown in figure 1, protective resistance 16, model cable 18, electric capacity 19 are arranged in metallic shield case 20, high-voltage connection 12
Through the tank wall of the metallic shield case 20, the waveguide 14 is arranged at the tank wall of the entrance of high-voltage connection 12, the high pressure
Series connection goes to disturb resistance 15 in lead 12；After the interference outer layer covers tack insulating tape of resistance 15 is removed, wrapped cable stress cone
13；DC generator 11, high-voltage connection 12 are connected；Between high-voltage connection 12 and protective resistance 16, protective resistance 16 and model
Connected respectively by grading ring 30 between cable 18, electric capacity 19.
As shown in figure 4, model cable 18 is included close to the first connection end 1801 of protective resistance 16, interlude 1802 and remote
From the second connection end 1803 of protective resistance 16, the first connection end 1801 and the second connection end 1803 are outside stripping certain length half
The two ends of the model cable 18 of conductive shielding layer.In Fig. 4, interlude 1802 includes out semiconductor layer（Outermost layer）, insulation
Layer（Intermediate layer）And wire, out semiconductor layer has been peeled off in the first connection end 1801 and the second connection end 1803.
Include in the present embodiment between three grading rings 30, i.e. high-voltage connection 12 and protective resistance 16 altogether, protective resistance
16th, the first connection end 1801, on three's tie point of electric capacity 19, the sky place of connecing of the second connection end 1803 sets one and pressed respectively
Ring.
First connection end 1801 of model cable 18 connects electric capacity 19, electric capacity 19, amplifier 22, oscillograph by grading ring
23 are linked in sequence successively；Sky connects after second connection end 1803 connection grading ring 30.
Setting pulse laser 21 at unthreaded hole, unthreaded hole is provided with the tank wall of metallic shield case 20, pulse laser 21
Transmitting light can be radiated on the interlude 1802 of model cable 18 by unthreaded hole.
The interlude 1802 of model cable 18 is grounded by metal fixture, wire connection.I.e. metal fixture is clamped in centre
In section 1802, metal fixture passes through wired earth.
The inside and outside semiconductive shielding layer thickness of model cable 18 is 0.8 ~ 1.2mm.
Insulation thickness is 2 ~ 6 mm；
The strip length of first connection end 1801 and the second connection end 1803 is 300 ~ 400 mm；
The length of interlude 1802 is 60 ~ 200 mm.
The BNC connector on tank wall that electric capacity 19 passes through metallic shield case 20 is connected with amplifier 22.
Go to disturb the resistance value of resistance 15 to be the M Ω of 1000 Ω ~ 10.Go the wave resistance for disturbing resistance 15 to be much larger than high-voltage connection
It is anti-, the external interference signals introduced by high-voltage connection can be greatly reduced.
Protective resistance is that resistance value is the G Ω of 200 M Ω ~ 2.Protective resistance 16 not only can guard amplifier and oscillograph, also
DC generator can be removed and produce interference of the ripple voltage to test signal.
BNC connector is connected by double layer screen signal wire with amplifier 22.
Amplifier is connected with oscillograph by signal wire.
The kV of pressure voltage 150 ~ 200 of electric capacity 19, the nF of electric capacity 0.5 ~ 2.Electric capacity 19 is by high direct voltage and secondary device（Amplification
Device and oscillograph）Isolation, and preferably coupled room charge signal.
Protective resistance, electric capacity, model cable etc. are shielded and prevent to do from extraneous electromagnetism by metallic shield case 20
Disturb signal.
Between high-voltage connection 12 and protective resistance 16, between protective resistance 16 and model cable 18, electric capacity 19, the second connection
Grading ring is provided with end.In the present embodiment, between protective resistance 16 and model cable 18, protective resistance 16 and electric capacity 19 it
Between be provided with grading ring, the tail end of the second connection end of model cable 18（Sky connects end）Grading ring is set.Circle is represented in accompanying drawing 1
Include in grading ring, the present embodiment between three grading rings 30, i.e. high-voltage connection 12 and protective resistance 16 altogether, protective resistance
16th, the first connection end 1801, on three's tie point of electric capacity 19, the sky place of connecing of the second connection end 1803 sets one and pressed respectively
Ring.
In the out semiconductor layer surface smear signal enhancing agent 17 of model cable 18 in the present embodiment（In interlude
1802 out semiconductor layer surface）；The transmitting light of pulse laser 21 can be radiated at signal enhancing agent 17 by unthreaded hole
On, signal can be strengthened, signal to noise ratio is improved.
Specifically, component parameter is in the present embodiment：
（1）DC generator, voltage 80 ~ 200, ripple factor≤0.5%, the mA of maximum current 1 ~ 10；
（2）High-voltage connection, pressure voltage >=150 kV, the mm of external diameter 10 ~ 15；
（3）Go to disturb resistance, the M Ω of resistance 1000 ~ 10；
（4）Protective resistance, the G Ω of M Ω of resistance 200 ~ 2；
（5）Model cable, inside and outside semiconductive shielding layer thickness 0.8 ~ 1.2, the mm of insulation thickness 2 ~ 6, length
650 ~ 900 mm, the mm of two ends outer semiconducting layer strip length 300 ~ 400, remaining outer semiconducting layer is long
Spend 60 ~ 200 mm；
（6）Electric capacity, the kV of pressure voltage 150 ~ 200, the nF of electric capacity 0.5 ~ 2；
（7）Metallic shield case, material is stainless steel or aluminium alloy, and the mm of case thickness 2 ~ 4 grows 1700 ~ 2000 mm,
Wide 700 ~ 900 mm, high 700 ~ 1000 mm；
（8）Pulse laser, the nm of wavelength 1064, the ns of pulsewidth 5 ~ 8, the mJ of energy 500 ~ 900；
（9）Amplifier, the dB of multiplication factor 40 ~ 60, the MHz of bandwidth 40 ~ 200, the Ω of input impedance 50；
（10）Oscillograph, the MHz of bandwidth 100 ~ 500, the GSa.s-1 of sample rate 1 ~ 5, the Ω of input impedance 50.
By technical solution of the present invention, by waveguide 14, interference resistance 15 is gone to significantly improve system letter after acting on
Make an uproar ratio；As shown in Figures 2 and 3, Fig. 2 is does not add waveguide and goes to disturb the interference signal waveform of resistance, and Fig. 3 is plus waveguide
With the interference signal waveform for removing interference resistance, external interference signal is significantly reduced, and signal to noise ratio is improved.
Those skilled in the art can to the present invention be modified or modification design but do not depart from the present invention think of
Think and scope.Therefore, if these modifications and variations of the present invention belong to the claims in the present invention and its equivalent technical scope
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (9)
1. high s/n ratio pressure wave method model cable space charge test system, it is characterised in that including DC generator（11）、
High-voltage connection（12）, stress cone（13）, waveguide（14）, go disturb resistance（15）, protective resistance（16）, model cable（18）、
Electric capacity（19）, metallic shield case（20）, pulse laser（21）, amplifier（22）, oscillograph（23）And grading ring（30）；
The protective resistance（16）, model cable（18）, electric capacity（19）It is arranged on metallic shield case（20）It is interior, high-voltage connection（12）
Through the metallic shield case（20）Tank wall, the waveguide（14）It is arranged on high-voltage connection（12）At the tank wall of entrance, institute
State high-voltage connection（12）Middle series connection goes to disturb resistance（15）；Going to disturb resistance（15）After outer layer covers tack insulating tape, around
Bag cable stress cone（13）；DC generator（11）, high-voltage connection（12）It is connected；High-voltage connection（12）With protective resistance（16）
Between, protective resistance（16）With model cable（18）, electric capacity（19）Between pass through grading ring respectively（30）Connection；
The model cable（18）Including close to protective resistance（16）The first connection end（1801）, interlude（1802）With it is remote
Protective resistance（16）The second connection end（1803）, first connection end（1801）With the second connection end（1803）To peel off one
The model cable of measured length out semiconductor layer（18）Two ends；
The model cable（18）The first connection end（1801）Electric capacity is connected by grading ring（19）, electric capacity（19）, amplifier
（22）, oscillograph（23）It is linked in sequence successively；Second connection end（1803）Connect grading ring（30）Sky connects afterwards；
The metallic shield case（20）Tank wall on be provided with unthreaded hole, the unthreaded hole setting pulse laser（21）, the arteries and veins
Rush laser（21）Transmitting light model cable can be radiated at by unthreaded hole（18）Interlude（1802）On.
2. high s/n ratio pressure wave method model cable space charge test system according to claim 1, it is characterised in that
The model cable（18）Interlude（1802）Pass through metal fixture, wire connection ground connection.
3. high s/n ratio pressure wave method model cable space charge test system according to claim 1, it is characterised in that
The model cable（18）Out semiconductor layer thickness be 0.8 ~ 1.2mm；
Insulation thickness is 2 ~ 6 mm；
First connection end（1801）With the second connection end（1803）Strip length be 300 ~ 400 mm；
The interlude（1802）Length is 60 ~ 200 mm.
4. high s/n ratio pressure wave method model cable space charge test system according to claim 1, it is characterised in that
The electric capacity（19）Pass through metallic shield case（20）Tank wall on BNC connector and amplifier（22）It is connected.
5. high s/n ratio pressure wave method model cable space charge test system according to claim 1, it is characterised in that
It is described to go to disturb resistance（15）Resistance value be the M Ω of 1000 Ω ~ 10.
6. high s/n ratio pressure wave method model cable space charge test system according to claim 1, it is characterised in that
Protective resistance（16）It is the G Ω of 200 M Ω ~ 2 for resistance value.
7. high s/n ratio pressure wave method model cable space charge test system according to claim 4, it is characterised in that
The BNC connector passes through double layer screen signal wire and amplifier（22）It is connected.
8. high s/n ratio pressure wave method model cable space charge test system according to claim 1, it is characterised in that
The amplifier（22）With oscillograph（23）Connected by signal wire.
9. high s/n ratio pressure wave method model cable space charge test system according to claim 1, it is characterised in that
Electric capacity（19）The kV of pressure voltage 150 ~ 200, the nF of electric capacity 0.5 ~ 2.
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| CN109557344A (en) * | 2018-12-30 | 2019-04-02 | 南瑞集团有限公司 | A kind of high pressure resistant pin configuration |
| CN109557373B (en) * | 2018-12-30 | 2023-11-17 | 南瑞集团有限公司 | Volume resistivity test system under high temperature and high pressure |
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