CN107015132A - A kind of different metal material is to SF6Exchange influence experimental provision and its method that PD is decomposed - Google Patents
A kind of different metal material is to SF6Exchange influence experimental provision and its method that PD is decomposed Download PDFInfo
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- CN107015132A CN107015132A CN201710401625.2A CN201710401625A CN107015132A CN 107015132 A CN107015132 A CN 107015132A CN 201710401625 A CN201710401625 A CN 201710401625A CN 107015132 A CN107015132 A CN 107015132A
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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
- G01R31/1254—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 gas-insulated power appliances or vacuum gaps
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Abstract
The present invention relates to a kind of different metal material to SF6Influence experimental provision and its method that PD is decomposed are exchanged, influence experimental provision includes compression system, electric discharge air chamber, detecting system and metal material protrusion defect model；The output end of the compression system is connected with metal material protrusion defect model, and metal material protrusion defect model is placed in electric discharge air chamber, and detecting system is connected with electric discharge air chamber and compression system simultaneously.Cost of the present invention is low, and experimental provision and its method are simply easy to spread, the PD malfunctions that different metal protrusion defect is caused in simulation gas-insulated group electrical equipment that can be good.
Description
Technical field
The invention belongs to the insulated on-line monitoring of outlet openings insulator arrangement and diagnostic techniques field, and in particular to one kind is not
With metal to sulfur hexafluoride (SF6) exchange air insulating device partial discharges fault analogue experiment installation and its method.
Background technology
With the development of electric utility, SF6Due to its good insulating properties, excellent arc-extinguishing and preferable cooling
Property, it has been widely used in such as power system devices such as gas-insulated group electrical equipment (Gas InsulateSwitchgear, GIS).
As GIS is using more and more extensive, voltage class also more and more higher, its importance in power system becomes increasingly conspicuous, GIS hairs
Raw failure will constitute huge threat to power system security, have a strong impact on the stability of power supply, gently then cause through
Ji loss, heavy then cause large-area power-cuts, it is therefore necessary to which that the operation conditions to GIS is paid much attention to, reduction GIS failures as far as possible
Odds.
However, SF6Gas insulated electric apparatus occurs that metal is dashed forward in which can not avoid in manufacture, assembling and running
Go out the insulation defect such as thing or the free particulate of metal, these insulation defects can be gradually degraded in During Process of Long-term Operation, when reaching
Device interior can be caused to occur shelf depreciation (PartialDischarge, PD) when to a certain degree, under PD effects, SF6Gas
It can decompose, generate a series of low-fluorine sulfide SFx(such as SF5、SF4、SF3、SF2, SF) and F atom etc., these decompose production
The thing such as foreign gases such as micro-moisture, oxygen are it also occur that a series of increasingly complex chemical reactions, generation such as SO2F2、
SOF2、CF4、SO2、SOF4、HF、CH4、CO2And H2The products such as S.Primary Study is found, solves content size and its change rule of product
Rule has close internal relation with PD types and its order of severity, therefore, it can utilize SF6Resolution characteristic is exhausted to monitor gas
The state of insulation of edge equipment, and carry out fault diagnosis.
At present on SF6The study hotspot for studying any art of resolution characteristic under exchange PD.But both at home and abroad in gas
The few different metal materials that are directed to of the research of body insulation electrical equipment on-line monitoring are to SF6Exchange the influence that PD is decomposed.
Such as " sulfur hexafluoride discharge decomposed gas component analysis system and its using for Patent No. ZL200710078493.0
" the insulating gas shelf depreciation decomposition components multizone detecting system of method " patent and Patent No. ZL 201210089955.X
And its method " patent, just for the simulation of gas insulated electric apparatus experiment under AC conditions, it is only capable of acquisition gas-insulated electric
The experimental data such as decomposition components of gas under equipment AC conditions, it is impossible to carry out different metal material to SF6Exchange what PD was decomposed
The related simulated experiment of influence.However, equipment air chamber part uses various metals material members, and under PD effects, SF6Decompose
F atom can be reacted with various metals, generation metal fluoride or metal sulfide, and the physical property of different metal
Also there is larger difference between chemical property, the formation of electrode material and analyte has direct relation.Therefore, only
Different metal material is differentiated to SF6The influencing characterisitic and mechanism of action of positive polarity direct current PD decomposable processes, could set up corresponding
Fault diagnosis practical technique.
Chinese patent literature CN1012059485A disclosed sulfur hexafluoride discharge decomposition gas group on October 24th, 2007
Divide analysis system and its application method, including with lower component：
Regulation Control platform, isolating transformer, halo-free experimental transformer, without partial discharge protective resistance, capacitive divider, lithium
Sulphur electric discharge decomposer, noninductive detection impedance, matching impedance, high-speed figure storage oscillograph and gas chromatograph.
State patent document CN1012059485A disclosed sulfur hexafluoride discharge decomposed gas component on October 24th, 2007
Analysis system and its application method, including following key step：
Vacuumize, inflate, measuring starting PD voltages, producing shelf depreciation, gas production, component analysis and discharge pulse signal and adopt
Collection.
The content of the invention
For fault simulation experimental provision not enough of existing gas insulated electric apparatus, there is provided a kind of different technologies material
Material is to SF6Influence experimental provision and method that PD is decomposed are exchanged, gas-insulated can electrically be set under laboratory simulation AC conditions
PD under the metallic projections defect model that standby interior various different metal materials are constituted, obtains different metal material to decomposition gas
The influence of the characteristic quantity such as component and its content, for the on-line monitoring and Condition assessment of insulation of gas insulated electric apparatus, provide can
Energy.
Realizing the technical scheme of the object of the invention is：
1. a kind of different metal material is to SF6Exchange the influence experimental provision that PD is decomposed, it is characterised in that including pressure system
System, electric discharge air chamber, detecting system and metal material protrusion defect model；The output end of the compression system is dashed forward with metal material
Go out thing defect model connection, metal material protrusion defect model be placed on electric discharge air chamber in, detecting system simultaneously with electric discharge gas
Room and compression system connection.
In a kind of above-mentioned different metal material to SF6Exchange the influence experimental provision that PD is decomposed, described compression system
It is made up of adjustable transformer, the halo-free experimental transformer of high pressure, capacitive divider and protective resistance.Pressure regulation becomes input connection of presenting a theatrical performance as the last item on a programme
220kV/50Hz civil powers, and pass through the halo-free experimental transformer of high pressure, the alternating voltage needed for output end is obtained.Connection protection electricity
Resistance, obtains the continually and steadily adjustable alternating voltage for putting on electric discharge air chamber.And pass through the real-time monitoring voltage value of voltage-dividing capacitor.
In a kind of above-mentioned different metal material to SF6The influence experimental provision that PD is decomposed is exchanged, the electric discharge air chamber is used
In placement metal material protrusion defect model, and exchange the part of PD experiments.It includes high pressure SF6/ casing air, gas
Room capping, air chamber cavity, metallic projections defect model, thief hatch ball valve, thief hatch, vavuum pump, grounded metal bar, three pin gold
Belong to support, injection port ball valve, injection port, vavuum pump, vacuum pump ball-valve, pressure gauge needle-valve, pressure gauge, O-ring seal screw rod spiral shell
Cap, quartz observing window and ground connection conducting rod.Air chamber is in slightly integrally spheroid shape, and be supported by three pin metallic supports.Air chamber
Capping and air chamber body are made of 202 steel.And sealed by O-ring seal and threaded spindle cap nut.Outer DC voltage of applying leads to
Cross high pressure SF6/ casing air is applied in metal material protrusion defect, carries out high-voltage alternating PD experiments.
In a kind of above-mentioned different metal material to SF6Exchange the influence experimental provision that PD is decomposed, the monitoring system bag
Include noninductive resistance, gas chromatography-mass spectrometry and high speed digital oscilloscope.The ground connection of noninductive resistance discharged in series air chamber is conductive
Bar, and be connected by cable with high speed digital oscilloscope, record corresponding PD letters obtained when exchange PD is tested and storing
Number.Gas chromatography-mass spectrometry is connected by PTFE flexible pipes with thief hatch, is analyzed and is obtained sample gas component.
In a kind of above-mentioned different metal material to SF6Exchange the influence experimental provision that PD is decomposed, the metallic projections
Defect model uses pin-template, and the needle point radius of curvature of pin electrode is about 0.3mm, and point angle is about 30 °, diameter about total length
About 60mm, and pass through internal thread hole and high pressure SF6/ casing air is affixed；Ground electrode is circle, a diameter of 120mm, thickness
10mm, crosses internal thread hole and ground connection conducting rod is affixed.SF is respectively adopted in pin electrode6Common fine aluminium fine copper in air insulating device
It is respectively prepared with 304 stainless steels, and plate electrode is made of 304 stainless steels.Pin-plate spacing can be by grounded metal bar and connecing
Elevating screw thread between ground conducting rod realizes adjustment, and pin-plate spacing can be made to be adjusted in the range of 0-30mm.
A kind of different metal material is to SF6The influence experimental method that PD is decomposed is exchanged, methods described is specific as follows：
Step 1, first, is carried out with absolute ethyl alcohol to wall in metallic projections defect model and air chamber capping and air chamber body
Wipe, to remove residual impurity；
Step 2, install after the metallic projections defect model of certain metal material, close thief hatch ball valve, injection port ball
Valve and pressure gauge needle-valve.And vacuum pump ball-valve is opened, vavuum pump is powered and run, electric discharge air chamber is vacuumized, when electric discharge air chamber
When vacuum is about 0.005MPa, vavuum pump and vacuum pump ball-valve, and static 12 hours are closed successively；
Step 3, with reference to the accompanying drawings circuit shown in 1 are attached and checked.Open and pressure gauge needle-valve.Vavuum pump is opened successively
With vacuum pump ball-valve, electric discharge air chamber is evacuated to vacuum again, when the chamber vacuum degree that discharges is about 0.005MPa, closed successively true
Empty pump and vacuum pump ball-valve.Injection port ball valve is opened, and it 99.999% is SF to be filled with volume fraction to be from injection port6Gas, directly
When to reading shown in pressure gauge being 1.5 atmospheric pressure, close injection port ball valve and stop sample introduction.After standing 5 minutes, open successively true
Empty pump and vacuum pump ball-valve, vacuum is evacuated to by electric discharge air chamber again, is closed successively when the chamber vacuum degree that discharges is about 0.005MPa
Close vavuum pump and vacuum pump ball-valve.Repetition above step last time 3 times；
Step 4, injection port ball valve is opened, and it 99.999% is SF to be filled with volume fraction to be from injection port6Gas, Zhi Daofang
Electric room pressure reaches requirement of experiment air pressure.And close injection port ball valve.To the H in electric discharge air chamber2O and O2Content is surveyed
Amount, it is ensured that H in air chamber2O and O2Content meets the requirements of DL/T596-2005；
Step 5, regulation Regulation Control platform, using method of progressively boosting, examine the waveform on high speed digital oscilloscope, when
When just there are PD pulses, voltage shown in the moment Regulation Control platform is recorded, firing potential U is designated as0.Consider SF6Point
Speed and experiment condition are solved, experimental voltage is firing potential U01.2~1.5 times of voltages be advisable.Experimental voltage is applied
In high pressure SF6On/casing air, metallic projections defect model is set to produce PD；
Step 6,96 hour voltages are applied to metallic projections defect model, Regulation Controls are closed every 12 hours
Platform, opens vavuum pump and the PTFE flexible pipes that thief hatch is connected with gas chromatography-mass spectrometry is evacuated into vacuum.Close vavuum pump simultaneously
Thief hatch ball valve is opened, qualitative and quantitative analysis is carried out to sample gas by gas chromatography-mass spectrometry.After analysis terminates, closing is adopted
Sample mouthful ball valve, and open vavuum pump PTFE flexible pipes are evacuated to vacuum.Vavuum pump is closed, Regulation Control platform is adjusted to experimental voltage；
Step 7, after the completion of step 6, close Regulation Control platform, vavuum pump and vacuum pump ball-valve opened successively, will be discharged
Air chamber is evacuated to vacuum again.When the chamber vacuum degree that discharges is about 0.005MPa, vavuum pump and vacuum pump ball-valve are closed successively.More
The metallic projections defect model that other metal materials are made is changed, then 1-step 6 of repeat step.
Cost of the present invention is low, and experimental provision and its method are simply easy to spread, the good simulation gas-insulated group electrical equipment of energy
The PD malfunctions that middle different metal protrusion defect is caused.
Brief description of the drawings
Fig. 1 is the experimental circuit theory diagram of apparatus of the present invention；
Fig. 2 is the structural representation of the electric discharge air chamber of apparatus of the present invention；
Fig. 3 is Fig. 2 top view；
The structural representation of the metallic projections defect model for the device that Fig. 4 utilizes for the present invention
Fig. 5 is the CO that embodiment 4 is detected2The change curve of content；
Fig. 6 is the SOF that embodiment 4 is detected2The change curve of content；
Fig. 7 is the SO that embodiment 4 is detected2F2The change curve of content；
Fig. 8 is the SO that embodiment 4 is detected2F2+SOF2The change curve of content；
Embodiment
Below in conjunction with the accompanying drawings and embodiment, the invention will be further described, in figure：Presented a theatrical performance as the last item on a programme 1. pressure regulation becomes, 2. high pressures
Halo-free experimental transformer, 3. protective resistances, 4. voltage-dividing capacitors, 5. electric discharge air chambers, 6. noninductive resistances, 7.High-speed figure oscillography
Device, 8. gas chromatography-mass spectrometries, 9. high pressure SF6/ casing air, 10. air chambers capping, 11. air chamber cavitys, 12. metals are dashed forward
Go out thing defect model, 12. thief hatch ball valves, 13. thief hatch, 14. vavuum pumps, 15. grounded metal bars, 16. 3 pin metallic supports,
17. injection port ball valve, 18. injection ports, 19. vavuum pumps, 20. vacuum pump ball-valves, 21. pressure gauge needle-valves, 22. pressure gauges, 23.O
Type sealing ring, 24. threaded spindle cap nuts, 25. quartz observing windows, 26. ground connection conducting rods, 27. pin electrodes, 28. ground electrodes.
Embodiment 1
A kind of different metal material is to SF6Exchange the influence experimental provision that PD is decomposed.Mainly include：Compression system, electric discharge
Air chamber, detecting system and metal protrude defect model.It is characterized in that described metal material protrusion defect model is described
Different metal material is to SF6Tested respectively in the influence experimental provision that exchange PD is decomposed.
Described compression system is by adjustable transformer, the halo-free experimental transformer of high pressure, capacitive divider and protective resistance group
Into.Pressure regulation becomes (1) input connection 220kV/50Hz civil powers of presenting a theatrical performance as the last item on a programme, and by the halo-free experimental transformer of high pressure (2), in output end
Alternating voltage needed for obtaining.Protective resistance (3) is connected, the continual and steady adjustable exchange for putting on electric discharge air chamber (5) is obtained
Voltage.And pass through the real-time monitoring voltage value of voltage-dividing capacitor (4).
The electric discharge air chamber (5) exchange the part of PD experiments to place metal material protrusion defect model.Its
Including high pressure SF6/ casing air (9), air chamber capping (10), air chamber cavity (11), metallic projections defect model (12), sampling
Mouth ball valve (13), thief hatch (14), vavuum pump (15), grounded metal bar (16), three pin metallic supports (17), injection port ball valve
(18), injection port (19), vavuum pump (20), vacuum pump ball-valve (21), pressure gauge needle-valve (22), pressure gauge (23), O-ring seal
(24) threaded spindle cap nut (25), quartz observing window (26) and ground connection conducting rod (27).Air chamber is in slightly integrally spheroid shape, and pass through three pin
Metallic support (17) is supported.Air chamber is covered (10) and air chamber body (11) and is made of 202 steel.And pass through O-ring seal
(24) sealed with threaded spindle cap nut (25).Apply DC voltage is applied to metal material by high pressure SF6/ casing airs (9) outside
In protrusion defect (12), high-voltage alternating PD experiments are carried out.
The monitoring system includes noninductive resistance (6), gas chromatography-mass spectrometry (7) and high speed digital oscilloscope (8).
The ground connection conducting rod (27) of noninductive resistance (6) discharged in series air chamber (9), and be connected by cable with high speed digital oscilloscope (8),
Obtain and store when carrying out exchange PD experiments and record corresponding PD signals.Gas chromatography-mass spectrometry (7) is soft by PTFE
Pipe is connected with thief hatch (14), analyzes and obtains sample gas component.
The metallic projections defect model (12) uses pin-template.Pin electrode (28) is made of fine aluminium, needle point it is bent
Rate radius is about 0.3mm, and point angle is about 30 °, diameter about total length about 60mm, and passes through internal thread hole and high pressure SF6/ air
Sleeve pipe (9) is affixed；Ground electrode (29) is circle, is made of 304 stainless steels, a diameter of 120mm, thickness 10mm, crosses internal thread
Hole and ground connection conducting rod (27) are affixed.Pin-plate spacing can be by the liter between grounded metal bar (16) and ground connection conducting rod (29)
Drop screw thread and realize adjustment, pin-plate spacing can be made to be adjusted in the range of 0-30mm.
Embodiment 2
A kind of different metal material is to SF6Exchange the influence experimental provision that PD is decomposed, be the same as Example 1.Wherein described category is prominent
The pin electrode for going out thing defect model (12) is made of pure copper material, and the needle point radius of curvature of pin electrode (31) is about 0.3mm, cone
Wedge angle is about 30 °, total length about 65mm, and passes through internal thread hole and high pressure SF6/ casing air (12) is affixed；Ground electrode (32)
For circle, it is made of 304 stainless steels, a diameter of 120mm, thickness 10mm, crosses internal thread hole and ground connection conducting rod (30) is affixed.
Pin-plate spacing is adjusted by the elevating screw thread between grounded metal bar (19) and ground connection conducting rod (30), makes pin-plate spacing
For 3.3mm.
Embodiment 3
A kind of different metal material is to SF6Exchange the influence experimental provision that PD is decomposed, be the same as Example 1.Wherein described category is prominent
The pin electrode for going out thing defect model (12) is made of 304 stainless steel materials, and the needle point radius of curvature of pin electrode (31) is about
0.3mm, point angle is about 30 °, total length about 65mm, and passes through internal thread hole and high pressure SF6/ casing air (12) is affixed；Ground
Electrode (32) is circle, is made of 304 stainless steels, a diameter of 120mm, thickness 10mm, crosses internal thread hole and ground connection conducting rod
(30) it is affixed.Pin-plate spacing is adjusted by the elevating screw thread between grounded metal bar (19) and ground connection conducting rod (30), is made
Pin-plate spacing is 3.3mm.
Embodiment 4
1) first, with absolute ethyl alcohol to metallic projections defect model (12) and air chamber capping (10) and air chamber body (11)
Inwall is wiped, to remove residual impurity；
2) after the metallic projections defect model (12) for installing certain metal material, thief hatch ball valve (13), sample introduction are closed
Mouth ball valve (18) and pressure gauge needle-valve (22).And vacuum pump ball-valve (21) is opened, vavuum pump (20) is powered and run, to electric discharge gas
Room (5) is vacuumized, and when air chamber (5) vacuum of discharging is about 0.005MPa, vavuum pump (20) and vacuum pump ball-valve are closed successively
(21) it is, and static 12 hours；
3) circuit shown in 1 is attached and checked with reference to the accompanying drawings.Open and pressure gauge needle-valve (22).Vavuum pump is opened successively
(20) electric discharge air chamber (5) and vacuum pump ball-valve (21), is evacuated to vacuum again, when electric discharge air chamber (5) vacuum is about
During 0.005MPa, vavuum pump (20) and vacuum pump ball-valve (21) are closed successively.Injection port ball valve (18) is opened, and from injection port
(19) it 99.999% is SF to be filled with volume fraction to be6Gas, until when reading shown in pressure gauge (23) is 1.5 atmospheric pressure, closing
Close injection port ball valve (18) and stop sample introduction.After standing 5 minutes, vavuum pump (20) and vacuum pump ball-valve (21) are opened successively, will be put
Electric panel room (5) is evacuated to vacuum again, closes vavuum pump (20) successively when air chamber (5) vacuum of discharging is about 0.005MPa and true
Empty pump ball-valve (21).Repetition above step last time 3 times；
4) injection port ball valve (18) is opened, and it 99.999% is SF to be filled with volume fraction to be from injection port (19)6Gas, directly
Requirement of experiment air pressure is reached to electric discharge air chamber (5) interior air pressure.And close injection port ball valve (18).To the H in electric discharge air chamber (5)2O
And O2Content is measured, it is ensured that H in air chamber2O and O2Content meets the requirements of DL/T596-2005；
5) regulation Regulation Control platform (1), applies 37.5kV stable alternating voltage in high pressure SF6On/casing air (9),
Metallic projections defect model (12) is set to produce PD；
6) 96 hour voltages are applied to metallic projections defect model (12), Regulation Control platform is closed every 12 hours
(1), open vavuum pump (15) and thief hatch (14) is evacuated to vacuum with the PTFE flexible pipes that gas chromatography-mass spectrometry (7) is connected.
Close vavuum pump (15) and open thief hatch ball valve (13), it is qualitative fixed that sample gas is carried out by gas chromatography-mass spectrometry (7)
Amount analysis.Analyze after terminating, closing thief hatch ball valve (13), and open vavuum pump (15) and PTFE flexible pipes are evacuated to vacuum.Close
Vavuum pump (15), experimental voltage is adjusted to by Regulation Control platform (1)；
7) after the completion of the 6) step, Regulation Control platform (1) is closed, vavuum pump (20) and vacuum pump ball-valve are opened successively
(21) electric discharge air chamber (5), is evacuated to vacuum again.When air chamber (5) vacuum of discharging is about 0.005MPa, vacuum is closed successively
Pump (20) and vacuum pump ball-valve (21).The metallic projections defect model (12) that other metal materials are made is changed, is returned to 1)
Step, then repeatedly 1) -6) step.
8) the is completed using the device of embodiment 1 6) after step, is closing Regulation Control platform (1), vavuum pump is opened successively
(23) and vacuum pump ball-valve (24), by SF6Electric discharge air chamber (10) is evacuated to vacuum again.Work as SF6Electric discharge air chamber (10) vacuum be
When 0.005~0,01MPa, vavuum pump (23) and vacuum pump ball-valve (24) are closed successively.The device for changing embodiment 1 is embodiment
2 device, returns to the 1) step, then repeatedly 1) -6) step.
9) the is completed using the device of embodiment 2 6) after step, is closing Regulation Control platform (1), vavuum pump is opened successively
(23) and vacuum pump ball-valve (24), by SF6Electric discharge air chamber (10) is evacuated to vacuum again.Work as SF6Electric discharge air chamber (10) vacuum be
When 0.005~0,01MPa, vavuum pump (23) and vacuum pump ball-valve (24) are closed successively.The device for changing embodiment 2 is embodiment
3 device, returns to the 1) step, then repeatedly 1) -6) step.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (6)
1. a kind of different metal material is to SF6Exchange the influence experimental provision that PD is decomposed, it is characterised in that including compression system, put
Electric panel room, detecting system and metal material protrusion defect model；The output end of the compression system and metal material protrusion
Defect model connect, metal material protrusion defect model be placed on electric discharge air chamber in, detecting system simultaneously with electric discharge air chamber with
And compression system connection.
2. a kind of different metal material according to claim 1 is to SF6Exchange the influence experimental provision that PD is decomposed, its feature
It is, described compression system is made up of adjustable transformer, the halo-free experimental transformer of high pressure, capacitive divider and protective resistance；
Pressure regulation becomes (1) input connection 220kV/50Hz civil powers of presenting a theatrical performance as the last item on a programme, and by the halo-free experimental transformer of high pressure (2), is obtained in output end
Obtain required alternating voltage；Protective resistance (3) is connected, the continually and steadily adjustable alternating current for putting on electric discharge air chamber (5) is obtained
Pressure；And pass through the real-time monitoring voltage value of voltage-dividing capacitor (4).
3. a kind of different metal material according to claim 1 is to SF6Exchange the influence experimental provision that PD is decomposed, its feature
It is, the electric discharge air chamber (5) is used to place metal material protrusion defect model, and exchange the part of PD experiments；Its
Including high pressure SF6/ casing air (9), air chamber capping (10), air chamber cavity (11), metallic projections defect model (12), sampling
Mouth ball valve (13), thief hatch (14), vavuum pump (15), grounded metal bar (16), three pin metallic supports (17), injection port ball valve
(18), injection port (19), vavuum pump (20), vacuum pump ball-valve (21), pressure gauge needle-valve (22), pressure gauge (23), O-ring seal
(24) threaded spindle cap nut (25), quartz observing window (26) and ground connection conducting rod (27)；Air chamber is in slightly integrally spheroid shape, and pass through three pin
Metallic support (17) is supported；Air chamber is covered (10) and air chamber body (11) and is made of 202 steel；And pass through O-ring seal
(24) sealed with threaded spindle cap nut (25)；Applying DC voltage passes through high pressure SF outside6/ casing air (9) is applied to metal material
In protrusion defect (12), high-voltage alternating PD experiments are carried out.
4. a kind of different metal material according to claim 1 is to SF6Exchange the influence experimental provision that PD is decomposed, its feature
It is, the monitoring system includes noninductive resistance (6), gas chromatography-mass spectrometry (7) and high speed digital oscilloscope (8)；Nothing
The ground connection conducting rod (27) of sensing resistor (6) discharged in series air chamber (9), and be connected by cable with high speed digital oscilloscope (8),
Obtain and store during exchange PD experiments recording corresponding PD signals；Gas chromatography-mass spectrometry (7) passes through PTFE flexible pipes
It is connected with thief hatch (14), analyzes and obtain sample gas component.
5. a kind of different metal material according to claim 1 is to SF6Exchange the influence experimental provision that PD is decomposed, its feature
It is, the metallic projections defect model (12) uses pin-template, and the needle point radius of curvature of pin electrode (28) is about 0.3mm,
Point angle is about 30 °, diameter about total length about 60mm, and passes through internal thread hole and high pressure SF6/ casing air (9) is affixed；Ground electricity
Pole (29) is circle, and a diameter of 120mm, thickness 10mm, cross internal thread hole and ground connection conducting rod (27) is affixed；Pin electrode is adopted respectively
Use SF6Common fine aluminium fine copper and 304 stainless steels are respectively prepared in air insulating device, and plate electrode uses 304 stainless steels
It is made；Pin-plate spacing can be realized by the elevating screw thread between grounded metal bar (16) and ground connection conducting rod (29) and adjusted, and can be made
Pin-plate spacing is adjusted in the range of 0-30mm.
6. a kind of different metal material is to SF6Exchange the influence experimental method that PD is decomposed, it is characterised in that specifically include：
Step 1, first, with absolute ethyl alcohol to metallic projections defect model (12) and air chamber capping (10) and air chamber body (11)
Inwall is wiped, to remove residual impurity；
Step 2, install after the metallic projections defect model (12) of certain metal material, close thief hatch ball valve (13), sample introduction
Mouth ball valve (18) and pressure gauge needle-valve (22)；And vacuum pump ball-valve (21) is opened, vavuum pump (20) is powered and run, to electric discharge gas
Room (5) is vacuumized, and when air chamber (5) vacuum of discharging is about 0.005MPa, vavuum pump (20) and vacuum pump ball-valve are closed successively
(21) it is, and static 12 hours；
Step 3, with reference to the accompanying drawings circuit shown in 1 are attached and checked；Open and pressure gauge needle-valve (22)；Vavuum pump is opened successively
(20) electric discharge air chamber (5) and vacuum pump ball-valve (21), is evacuated to vacuum again, when electric discharge air chamber (5) vacuum is about
During 0.005MPa, vavuum pump (20) and vacuum pump ball-valve (21) are closed successively；Injection port ball valve (18) is opened, and from injection port
(19) it 99.999% is SF to be filled with volume fraction to be6Gas, until when reading shown in pressure gauge (23) is 1.5 atmospheric pressure, closing
Close injection port ball valve (18) and stop sample introduction；After standing 5 minutes, vavuum pump (20) and vacuum pump ball-valve (21) are opened successively, will be put
Electric panel room (5) is evacuated to vacuum again, closes vavuum pump (20) successively when air chamber (5) vacuum of discharging is about 0.005MPa and true
Empty pump ball-valve (21)；Repetition above step last time 3 times；
Step 4, injection port ball valve (18) is opened, and it 99.999% is SF to be filled with volume fraction to be from injection port (19)6Gas, directly
Requirement of experiment air pressure is reached to electric discharge air chamber (5) interior air pressure；And close injection port ball valve (18)；To the H in electric discharge air chamber (5)2O
And O2Content is measured, it is ensured that H in air chamber2O and O2Content meets the requirements of DL/T596-2005；
Step 5, regulation Regulation Control platform (1), using method of progressively boosting, examine the waveform on high speed digital oscilloscope (8),
When just there are PD pulses, voltage shown in the moment Regulation Control platform (1) is recorded, firing potential U is designated as0；Synthesis is examined
Consider SF6Decomposition rate and experiment condition, experimental voltage are firing potential U01.2~1.5 times of voltages be advisable；Will experiment electricity
Pressure is applied to high pressure SF6On/casing air (9), metallic projections defect model (12) is set to produce PD；
Step 6,96 hour voltages are applied to metallic projections defect model (12), Regulation Control platforms are closed every 12 hours
(1), open vavuum pump (15) and thief hatch (14) is evacuated to vacuum with the PTFE flexible pipes that gas chromatography-mass spectrometry (7) is connected；
Close vavuum pump (15) and open thief hatch ball valve (13), it is qualitative fixed that sample gas is carried out by gas chromatography-mass spectrometry (7)
Amount analysis；Analyze after terminating, closing thief hatch ball valve (13), and open vavuum pump (15) and PTFE flexible pipes are evacuated to vacuum；Close
Vavuum pump (15), experimental voltage is adjusted to by Regulation Control platform (1)；
Step 7, after the completion of step 6, close Regulation Control platform (1), vavuum pump (20) and vacuum pump ball-valve (21) opened successively,
Electric discharge air chamber (5) is evacuated to vacuum again；When air chamber (5) vacuum of discharging is about 0.005MPa, vavuum pump is closed successively
And vacuum pump ball-valve (21) (20)；The metallic projections defect model (12) that other metal materials are made is changed, then repeats to walk
Rapid 1-step 6.
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| CN113406243A (en) * | 2021-07-26 | 2021-09-17 | 沈阳工业大学 | Gas decomposition product component detection system and method |
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| CN109688688A (en) * | 2018-07-20 | 2019-04-26 | 南京航空航天大学 | A kind of gas medium barrier discharge plasma generation device |
| CN113406243A (en) * | 2021-07-26 | 2021-09-17 | 沈阳工业大学 | Gas decomposition product component detection system and method |
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