CN101793939B - Partial discharge simulation experiment device of suspended metal particles in oil of transformer - Google Patents
Partial discharge simulation experiment device of suspended metal particles in oil of transformer Download PDFInfo
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- CN101793939B CN101793939B CN2009101908874A CN200910190887A CN101793939B CN 101793939 B CN101793939 B CN 101793939B CN 2009101908874 A CN2009101908874 A CN 2009101908874A CN 200910190887 A CN200910190887 A CN 200910190887A CN 101793939 B CN101793939 B CN 101793939B
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Abstract
The invention discloses a partial discharge simulation experiment device of suspended metal particles in oil of a transformer, which belongs to the technical field of partial discharge online monitoring of oil immersed transformers. The partial discharge simulation experiment device mainly comprises an induction regulator, a non-corona test transformer, a non-partial discharge protective resistor, a standard capacity voltage divider, a partial discharge generation device, a noninductive detection resistor, an ultrahigh frequency antenna, a coaxial cable, a broadband high-speed large-capacity digital storage oscillometer and the like. The partial discharge simulation experiment device can simulate stable partial discharge signals generated by the suspended metal particles in flowing oil with different oil flowing speeds at different temperatures when the oil immersed transformer is in a working stage. Therefore, the partial discharge simulation experiment device can be widely applied to the simulation of partial discharge generated by the defect of the suspended metal particles in the oil immersed transformer in a laboratory and can provide reliable experimental data for teaching, scientific research institutions and schools and transformer manufacturers to monitor oil immersed transformers on line and analyze and apply partial discharge signals.
Description
Technical field
The invention belongs to oil-immersed power transformer shelf depreciation (PD) on-line monitoring technique field, particularly relate to suspended metal particles shelf depreciation manual simulation experimental provision in a kind of forced oil-circulation formula transformer oil.
Background technology
Large-scale power transformer is the most expensive and one of equipment of strategic significance is arranged most in the electric power transmission network, and its reliability plays crucial effects to the safe and reliable operation of whole electric system.The 220kV of operation and the power transformer of above electric pressure all adopt oil-filled transformer at present, large oil immersed power transformer has serious consequence because paper oil insulation punctures the fault that causes, cause the huge maintenance cost and the economic loss of large-area power-cuts, the threat of its security of operation mainly comes from the oil-insulation system.Pure transformer oil insulating property are good, and its insulating property can descend greatly when having the foreign metal particulate in the oil.In the oil-immersed power transformer operational process, the well cuts metal particle generally is distributed near the high-low pressure winding, can be attracted between turn-to-turn, line cake and barrier and form conducting bridge, and then cause partial breakdown, threatens the transformer safe operation.Therefore, oil-immersed power transformer is carried out Partial Discharge Detection, can in time find the insulation defect that exists in the transformer and take appropriate measures, can avoid the generation of transformer fault, guarantee the safe and reliable operation of electric system.
Metal particle produces the experimental provision of shelf depreciation in the existing oil-immersed power transformer oil; as the 30th volume the 4th phase " High-Voltage Technology " of April in 2004 " in the super high band in the oil with the research of an aerial discharge spectral characteristic " literary composition; disclosed " Partial Discharge Detection loop "; mainly by automatic coupling voltage regulator; isolating transformer; HT testing transformer; the protection water resistance; high frequency sensors; standard capacitance; uhf sensor; electrode model; shielded cable is formed; electrode model adopts and places the floating potential discharge that metal particle simulation metal particle causes on post-plate electrode; sustainable tens nanoseconds of discharge pulse that produce; signal energy mainly is distributed in the 400-1000MHz scope, the band width broad.But discharging model can only be simulated the single metal particulate and produce shelf depreciation under post-plate electrode effect, can not change influence factors such as field intensity, temperature, and can't produce oil stream, can not real simulated actual motion transformer oil in metal particle cause the situation of shelf depreciation.Suspended metal particles produces shelf depreciation in transformer oil, therefore be subjected to the influence of factors such as field intensity, oily flow velocity degree, temperature, metal particle material and size thereof, with the shelf depreciation that metal particle causes in the forced oil-circulation formula transformer oil in can not dry run of metal particle defect model in the static oil.
Summary of the invention
The objective of the invention is to produce the deficiency of shelf depreciation experimental provision at metal particle in the existing oil-immersed power transformer oil, suspended metal particles defective partial discharge simulation experiment device in a kind of transformer oil that provides, can in experiment lab simulation transformer oil, suspend, the moving metal particle defects, and can measure different field intensity, oil flow velocity degree, temperature, the local discharge signal that factor effects such as metal particle material produce down, obtain the shelf depreciation experimental data of this insulation defect of reflection, be feature and the influence factor of studying shelf depreciation under this defective, and then realize providing reliable experimental the PD Pattern Recognition and the fault diagnosis of metal particle defective in the transformer.
Apparatus of the present invention principle: the oil of oil-immersed power transformer can be considered incompressible viscous fluid, and it is moving that its flowing in the insulation oil duct can be referred to as incompressible viscous flow.Viscous fluid compares to the main difference of ideal fluid on mechanical model and mathematical description and shows as to exist in the viscous fluid on viscous stress and the solid walls border and satisfy non-slip condition, be that drag flow cognition is attached to solid walls, have identical speed with solid walls.Because the existence of viscosity, the motion of fluid generally has revolves.Can not press VISCOUS FLOW on mathematics, can describe by continuity equation and Navier-Stokes equation.Because real fluid all is to have viscosity, when real fluid flows, two kinds of flow states are arranged generally in pipeline, one is Laminar Flow, and one is Turbulence Flow, and this is the flow state of two kinds of different in kinds.During Laminar Flow, the tube fluid laminar flow does not mix mutually between each laminar flow and is parallel to conduit axis motion, does not have the mutual exchange of fluid particle between fluid layer, and the pressure of fluid by a segment pipe falls with flow and is directly proportional.During Turbulence Flow, tube fluid is laminar flow no longer, and fluid particle is except that also having violent radial motion along the conduit axis direction is moved, and the pressure of fluid by a segment pipe falls and square being directly proportional of flow.
Typical average oil flow velocity degree is 0.2m/s in the large-scale forced oil-circulation power transformer, can reach 0.45～0.60m/s between the line cake, the stream scooter 1～2m/s of transformer hydraulic fluid port place.In order to study the influence of flow velocity to suspended particulate shelf depreciation, the flow velocity in the oil duct model should have enough wide variation range.But then, ultrahigh voltage transformer oil flow velocity degree is controlled at below the 1m/s usually at present.For this reason, selecting for use 2m/s on average to test flow velocity as maximum should be able to engineering demands.The oil clearance cross section is flat rectangle in the design oil duct, and the oil duct long enough, and fluidised form can attain full development, and its oil stream flox condition is similar to transformer device structure with discharging condition.By between pole plate, applying AC field, can the analog AC uniform field under suspended metal particles defective discharge in the oil.
Flow in the oil duct
In the formula: Q
VBe flow in the oil duct, W
1Be oil duct width, H
1Be the oil duct height,
Be oily flow velocity degree in the oil duct.
China's oil-immersed power transformer, most of paper oil insulation (being the A class B insulation) that adopts.For the transformer of A class B insulation, be 105 ℃ in the limit of working temperature normally in service, transformer insulated, temperature rise is less than 60K, and its nominal operation temperature is 0～55 ℃.The density of oil is about 0.85kg/m
3By with oily 8L, then You quality is m=6.8kg.The specific heat of oil is C=2.0kJ/ (kg ℃), as if the influence of not considering to dispel the heat, and t=1 ℃ of the every rising Δ of then oily temperature, required time is Δ t ', is got by cm Δ t=p Δ t ':
Δ t '=cm Δ t/p, wherein: P is the heating tube general power.
The technical scheme that realizes the object of the invention is: suspended metal particles partial discharge simulation experiment device in a kind of transformer oil; mainly comprise induction voltage regulator (T1); there is not dizzy testing transformer (T2); protective resistance (R) is put in no office; standard capacitor divider (C1; C2); the shelf depreciation generating means; ultra-high frequency antenna; noninductive detection resistance; concentric cable; wideband high speed vast capacity digital storage oscilloscope; the secondary of induction voltage regulator (T1) links to each other with the former limit of not having dizzy testing transformer (T2) by cable; the secondary that does not have a dizzy testing transformer (T2) earlier and no office put after protective resistance (R) connects; again with standard capacitor divider (C1; C2) parallel connection, and then be connected by the indoor shelf depreciation generating means of high-voltage connection and metallic shield.Feature is: the shelf depreciation generating means is made up of oil duct model, two disc electrodes, oil pump, flow control valve, temperature controller, flowmeter, oil duct model and disc electrode are installed in the oil duct supporting box, flowmeter and temperature controller are installed in the stainless-steel tube, connect by leather hose between the stainless-steel tube two ends of the circular joint of the simulation oil duct square tube in the oil duct model, flow control valve, oil pump, installing flowmeter, temperature controller.Simulation oil duct square tube in the oil duct model is the plexi-glass tubular of long 600～650mm, the cross section is a rectangle, its length is 85～95mm, the wide 15～20mm of being, two disc electrodes are installed in the upper and lower surface place of simulation oil duct square tube respectively, so that the oil duct model is applied ac high-voltage.The two ends of simulation oil duct square tube are equiped with the organic glass seal pad and the pipe joint of band central through hole respectively, so that be connected with oil pump and flowmeter by leather hose respectively, are full of the insulating oil that transformer is used in simulation oil duct square tube.Oil pump circulates and produces oil pressure in order to impel the oil in the oil duct model, and flowmeter is in order to instantaneous delivery and the integrated flux and the demonstration of oil stream in the metering oil duct model.Exit at oil pump is equiped with flow control valve, so that the flow velocity of oil in the control oil duct model.Between flow control valve and flowmeter, temperature controller is housed, temperature controller comprises thermopair, heating resistor, the digital displaying temperature instrument that is installed in the stainless-steel tube, heating resistor is electrically connected with the 220V city by thermopair and lead, and thermopair is connected with the digital displaying temperature instrument by signal wire.Regulate the digital displaying temperature instrument experimental temperature is set, thermopair heats the oil in the stainless-steel tube with regard to controlling heating resistor, and makes the oil in the oil duct model reach the experimental temperature of setting by the oil pump circulation, so that experimentize.Metal particle is the stainless steel bead of diameter 1～2mm, and it is positioned over impeller place in the oil pump, starts oil pump, and metal particle flows to into the oil duct model with oil and is suspension, mobile status, thus suspended metal particles defective in the analogue transformer oil.Ultra-high frequency antenna is installed on the outer lower wall of shelf depreciation generating means, and is connected with wideband high speed vast capacity digital storage oscilloscope by concentric cable, in order to collection local discharge superhigh frequency signal, and is transferred to wideband high speed vast capacity digital storage oscilloscope.It is indoor that shelf depreciation generating means and ultra-high frequency antenna all are installed in metallic shield, and metallic shielded room is in order to the analogue transformer casing, and shielding external electromagnetic wave interference, guarantees the reliability of experimental data.Disc electrode is by high tension terminal and spherical shield cover and insulating sleeve, be connected with high-voltage connection, another disc electrode is connected with noninductive detection resistance one end by concentric cable, and be connected noninductive detection resistance other end ground connection with wideband high-speed high capacity digital storage oscilloscope by concentric cable.The AC field effect under different field intensity, oily flow velocity degree, temperature of suspension moving metal particulate produces shelf depreciation in apparatus of the present invention energy analogue transformer oil, the ultra-high frequency antenna of device is gathered the local discharge superhigh frequency electromagnetic wave signal, noninductive detection resistance measurement partial discharge pulse current signal, and transfer to wideband high speed vast capacity digital storage oscilloscope by concentric cable respectively and carry out analyzing and processing.
The concrete steps of the experimental technique of suspended metal particles partial discharge simulation experiment device are as follows in a kind of transformer oil:
(1) the maximum outer experimental voltage U that executes of measurement apparatus of the present invention
Max
Regulate the induction voltage regulator (T1) of experimental provision of the present invention earlier, begin to raise gradually from 0kV, examine in the process of boosting on the wideband high-speed figure storage oscilloscope no signal is arranged, when the fine discharge pulse signal occurring, note the maximum outer experimental voltage (U that executes that the applied voltage that is added in this moment on the analogue experiment installation is this device
Max).
(2) measure firing potential U
St
In the oil duct model of apparatus of the present invention, put into the stainless steel bead of diameter 1～2mm, make its density in oil reach 1/more than the 100mL, regulate the induction voltage regulator (T1) of experimental provision of the present invention, begin to raise gradually from 0kV, examine in the process of boosting on the wideband high-speed figure storage oscilloscope no signal is arranged, when the fine discharge pulse signal occurring, note the applied voltage that is added on the analogue experiment installation this moment and be shelf depreciation firing potential (U
St).
(3) carry out partial discharge simulation experiment
(1), after (2) step finishes, regulate earlier the flow control valve Control Flow respectively, regulate the temperature that temperature controller control experiment needs, again apparatus of the present invention are applied firing potential (U
St) 1.2～1.5 times of voltages carry out suspended metal particles shelf depreciation experiment in the oil duct model.
(4) measure and write down local discharge signal
Local discharge signal under the suspended metal particles defective that produces in the oil duct model, after the local discharge signal pulse can inspire the uhf electromagnetic wave signal, in double layer screen is indoor, propagate, utilize 50 ohm of noninductive detection resistance and be installed in pulsed current signal and the uhf electromagnetic wave signal that the uhf sensor on the box body wall can receiving trap produces, transfer to storage oscilloscope collection of wideband high-speed figure and tracer signal waveform through concentric cable.According to discharge signal repeatability and stable, considering the discharge has certain statistical law, experimental data can be pressed the group # record.This device is 1 group to the artificial defect experimental data of different experimental conditions with 80～150 pulse trains and writes down more appropriate.
After the present invention adopts technique scheme, mainly contain following effect:
1) apparatus of the present invention are not adding under the defect situation, and the highest voltage that applies is 25kV, in this interference such as can not producing corona discharge that experimentizes below voltage.Add the metal particle defective and experimentize, firing potential obviously reduces, and minimum firing potential is 5kV, and discharge signal is stable;
2) apparatus of the present invention can be regulated oily flow velocity degree and temperature variation easily, and actual adjustable flow variation range is 0.5～10.9m
3/ h, the adjustable temperature variation range is 20～75 ℃, the local discharge signal that produces under the different oily flow velocity degree of transformer and the temperature in therefore can dry run;
3) Fig. 5 and Fig. 6 are respectively the time domain and the frequency-domain waveform of metal particle generation local discharge signal in the static oil, and trial voltage is 10kV, and particulate is the 1.5mm steel ball, and its signal amplitude is approximately 12mV, and its spectral range is between 100MHz～200MHz.Fig. 7 and Fig. 8 are respectively the time domain and the frequency-domain waveform of suspended metal particles generation local discharge signal in the mobiloil, and trial voltage is 10kV, and particulate is the 1.5mm steel ball, and its signal amplitude is approximately 8mV, and its spectral range is between 100MHz～500MHz.From the signal that records, the shelf depreciation that the metal particle defective produces under two kinds of test conditions has obvious difference on waveform and frequency spectrum, and apparatus of the present invention can be used for simulating the local discharge signal that mobiloil suspended metal particles defective produces.
The present invention can be widely used in the shelf depreciation that the inner suspended metal particles defective of experiment lab simulation oil-filled transformer produces, and gather original local discharge signal waveform by the high-speed figure storage oscilloscope, be teaching, scientific research institutions and transformer manufacturing firm, provide reliable experimental oil-filled transformer on-line condition monitoring and the analysis and the application that detect local discharge signal.
Description of drawings
Fig. 1 is apparatus of the present invention wiring diagram;
Fig. 2 is apparatus of the present invention schematic diagram;
Fig. 3 is the oil stream circulation synoptic diagram of shelf depreciation analogue means among Fig. 2;
Fig. 4 is an oil duct model structure synoptic diagram among Fig. 3;
Fig. 5 is metal particle shelf depreciation time domain waveform figure in the static transformator oil;
Fig. 6 is metal particle shelf depreciation frequency-domain waveform figure in the static transformator oil;
Fig. 7 is suspended metal particles shelf depreciation time domain waveform figure in the transformer oil;
Fig. 8 is suspended metal particles shelf depreciation frequency-domain waveform figure in the transformer oil.
Among the figure: 1 induction voltage regulator (T1), 2 do not have dizzy testing transformer (T2), and protective resistance (R) is put in 3 no offices; 4 standard capacitor divider (C1; C2), 5 supporting insulators, 6 high-voltage connections; 7 metallic shielded room, 8 insulating sleeves, 9 shelf depreciation generating meanss; 10 simulation oil ducts; 11 ultra-high frequency antennas, 12 50 ohm of noninductive detection resistance, 13 concentric cable; 14 wideband high speed vast capacity digital storage oscilloscopes; 15 flowmeters, 16 temperature controllers, 17 flow control valves; 18 oil pumps; 19 spherical shield covers, 20 high tension terminals, 21 high-field electrode fixed sleevings; 22 oil duct supporting box; 23; 26 disc electrodes, 24 simulation oil duct square tubes, 25 pipe joints; 27 low-field electrode fixed sleevings, 28 ground connection binding posts.
Embodiment
Below in conjunction with embodiment, further specify the present invention.
Embodiment
Shown in Fig. 1-6; suspended metal particles partial discharge simulation experiment device in a kind of transformer oil mainly comprises induction voltage regulator 1, does not have dizzy testing transformer 2, protective resistance 3, standard capacitor divider 4, shelf depreciation generating means 9, ultra-high frequency antenna 11, noninductive detection resistance 12, concentric cable 13, wideband high speed vast capacity digital storage oscilloscope 14 are put in no office.The secondary of induction voltage regulator 1 links to each other with the former limit of not having dizzy testing transformer 2 by cable; the secondary that does not have a dizzy testing transformer 2 earlier and no office put after protective resistance 3 connects; in parallel with standard capacitor divider 4 again, and then be connected with shelf depreciation generating means 9 by high-voltage connection 6.Feature is: shelf depreciation generating means 9 is made up of oil duct model 10, flowmeter 15, temperature controller 16, flow control valve 17, oil pump 18, two disc electrodes 23,26, oil duct model 10 and disc electrode 23,26 are installed in the oil duct supporting box 22, flowmeter 15 and temperature controller 16 are installed in the stainless-steel tube, connect by leather hose between the stainless-steel tube two ends of circular joint 25, flow control valve 17 and the oil pump 18 of the simulation oil duct square tube 24 in the oil duct model 10, installing flowmeter 15, temperature controller 16.Simulation oil duct square tube 24 in the oil duct model 10 is the plexi-glass tubular of long 600mm, the cross section is a rectangle, its long for 85mm, wide be 15mm, two disc electrodes 23,26 are installed in the upper and lower surface place of simulating oil duct square tube 24 respectively, so that oil duct model 10 is applied ac high-voltage.The two ends of simulation oil duct square tube 24 are equiped with the organic glass seal pad and the pipe joint 25 of band central through hole respectively, so that be connected with oil pump 18 and flowmeter 15 by leather hose respectively, are full of the insulating oil that transformer is used in simulation oil duct square tube 24.Oil pump 18 circulates and produces oil pressure in order to impel the oil in the oil duct model 10, and flowmeter 15 also shows in order to the instantaneous delivery and the integrated flux of oil stream in the metering oil duct model.Be equiped with flow control valve 17 in the exit of oil pump, so that the flow velocity of oil in the control oil duct model.Between flow control valve 17 and flowmeter 15, temperature controller 16 is housed, temperature controller 16 comprises thermopair, heating resistor, the digital displaying temperature instrument that is installed in the stainless-steel tube, heating resistor is electrically connected with the 220V city by thermopair and lead, and thermopair is connected with the digital displaying temperature instrument by signal wire.Regulate the digital displaying temperature instrument experimental temperature is set, thermopair heats the oil in the stainless-steel tube with regard to controlling heating resistor, and makes the oil in the oil duct model reach the experimental temperature of setting by oil pump 18 circulations, so that experimentize.Metal particle is the stainless steel bead of diameter 1mm, 1.5mm, and it is positioned over impeller place in the oil pump 18, starts oil pump 18, and metal particle flows to into oil duct model 10 with oil and is suspension, mobile status, thus suspended metal particles defective in the analogue transformer oil.On the outer lower wall of ultra-high frequency antenna 11 installing shelf depreciation generating meanss, and be connected with wideband high speed vast capacity digital storage oscilloscope 14 by concentric cable 13, in order to collection local discharge superhigh frequency signal, and be transferred to wideband high speed vast capacity digital storage oscilloscope 14.Shelf depreciation generating means 9 and ultra-high frequency antenna 11 all are installed in the metallic shielded room 7, and metallic shielded room 7 is in order to the analogue transformer casing, and shielding external electromagnetic wave interference, guarantee the reliability of experimental data.Disc electrode 23 is by high tension terminal 20 and spherical shield cover 19 and insulating sleeve 8, be connected with high-voltage connection 6, another disc electrode 26 is connected with noninductive detection resistance 12 1 ends by concentric cable 13, and be connected noninductive detection resistance 12 other end ground connection with wideband high-speed high capacity digital storage oscilloscope 14 by concentric cable 13.The AC field effect under different field intensity, oily flow velocity degree, temperature of suspension moving metal particulate produces shelf depreciation in apparatus of the present invention energy analogue transformer oil, the ultra-high frequency antenna of device is gathered the local discharge superhigh frequency electromagnetic wave signal, noninductive detection resistance measurement partial discharge pulse current signal, and transfer to wideband high speed vast capacity digital storage oscilloscope by concentric cable respectively and carry out analyzing and processing.
The concrete steps of the experimental technique of suspended metal particles shelf depreciation analogue means are as follows in a kind of transformer oil:
1, preliminary work: connect circulation line, pipe joint is partly made encapsulation process, the position that need seal comprises 10 liang of end interfaces of oil inlet and outlet, oil duct model and 15 liang of end interfaces of flowmeter of circulating oil pump 18, adopts leather hose to connect, and guarantees not have the gas leak of the oil leakage point.Inject clean 25# transformer oil from pouring orifice, make bubble discharge in the pipeline by oil pressure.For residual micro bubble, adopt to apply external force and to start oil pump in short-term to apply disturbance and transformer oil is heated, promote the discharge of bubble, storing to be installed is put certain hour and can be experimentized after stable.
The transformer analogue means exists sealing problem, and the installation of flowmeter 15 adopts flange to connect in this analogue means, and the middle rubber cushion that adopts seals.All the other oil pumps and simulation oil duct 10 and flowmeter 15 and temperature controller 16 employing leather hose connected modes, the connection of seam crossing adopts conical steel pipe to be connected with the steel wire leather hose, sealing adopts polytetrafluoroethylraw raw material band to tightly wrap, the gas leak of the oil leakage situation can be so that do not take place in the test in stirrup circle on the leather hose outer cover.
2, measure the maximum outer experimental voltage of executing.Not placing under the artificial defect model case, connect experimental line, regulate induction voltage regulator 1, slow rising experimental voltage, examining on the digital storage oscilloscope 14 has no signal, when the fine discharge pulse signal occurring, notes the applied voltage that is added on the analogue experiment installation this moment and (is U
Max), this magnitude of voltage is the highest applied voltage in the later experimentation, be that simulated experiment voltage can not surpass this magnitude of voltage, otherwise can be obscured with the PD signal that artificial defect causes by the local discharge signal that experimental provision itself produces, cause experimental result inaccurate, even whether can't discern be the PD signal that artificial defect produces.
The PD that carries out transformer detects in the test, and high-voltage connection 6 and high-field electrode 23 shieldings all should be not have to swoon, and all will adopt adequate shielding and all press measure the most advanced and sophisticated position on noble potential and the earth potential in the High-Voltage Experimentation, avoid producing on these positions discharge.In order to reduce surface electric field intensity, just must increase the surface curvature radius, increase interpolar or distance over the ground, the surfacing of attention electrode and smooth.High tension terminal 20 can adopt the radome 19 of sphere or Crossed Circle, and lead-in wire must adopt large diameter metal tube.The smooth aluminum pipe effect of high-voltage connection 6 usefulness is best, introduces screened rooms 7 inner high voltage sleeve pipes 8 through supporting insulator 5 and inserts high-field electrodes 23.Because this simulated experiment institute making alive is no more than 50kV, therefore adopting the aluminum pipe of diameter 10mm to do high-voltage connection can meet the demands.Lead-in wire is that the Metal Ball of 60mm is all pressed with the junction of device with diameter.
3, measure initial PD voltage.In the oil duct model of apparatus of the present invention, put into the stainless steel bead of diameter 1mm, 1.5mm, make its density in oil reach 1/more than the 100mL, regulate the induction voltage regulator 1 of experimental provision of the present invention, begin to raise gradually from 0kV, examine in the process of boosting on the wideband high-speed figure storage oscilloscope 14 no signal is arranged, when the fine discharge pulse signal occurring, note the applied voltage that is added on the analogue experiment installation this moment and be shelf depreciation firing potential (U
St).
4, carry out the shelf depreciation experiment.Regulate the oily flow velocity degree that flow control valve 17 selections need, reading is presented on the flowmeter gauge outfit.Regulate temperature controller 16 and set the experimental temperature that needs, treat that regulating induction voltage regulator 1 behind resistance heated a period of time temperature stabilization applies firing potential (U to apparatus of the present invention respectively
St) 1.2,1.3,1.4,1.5 times of voltages, examine the waveform on the digital storage oscilloscope 14, when the stable discharging pulse occurring, note this moment voltage, be designated as U
Ex, this voltage is the experimental voltage of shelf depreciation.
5, experimental data collection.The suspended metal particles defective produces local discharge signal in the transformer oil, observes signal stabilization on digital storage oscilloscope 14, writes down this waveform when repetition rate is high.According to experimental data repeatability and stable, considering the discharge has certain statistical law, experimental data can be pressed the group # record.This device is 1 group to the artificial defect experimental data of different experimental conditions with 100 pulse trains and writes down more appropriately, writes down 15 groups altogether.
Claims (1)
1. suspended metal particles partial discharge simulation experiment device in the transformer oil; mainly comprise induction voltage regulator (1); there is not dizzy testing transformer (2); protective resistance (3) is put in no office; standard capacitor divider (4); shelf depreciation generating means (9); ultra-high frequency antenna (11); noninductive detection resistance (12); concentric cable (13); wideband high speed vast capacity digital storage oscilloscope (14); the secondary of induction voltage regulator (1) links to each other with the former limit of not having dizzy testing transformer (2) by cable; the secondary that does not have a dizzy testing transformer (2) earlier and no office put after protective resistance (3) connects; in parallel with standard capacitor divider (4) again; and then be connected with shelf depreciation generating means (9) by high-voltage connection (6); it is characterized in that shelf depreciation generating means (9) is by oil duct model (10); flowmeter (15); temperature controller (16); flow control valve (17); oil pump (18); two disc electrodes (23; 26) form; oil duct model (10) and two disc electrodes (23; 26) be installed in the oil duct supporting box (22); flowmeter (15) and temperature controller (16) are installed in the stainless-steel tube; the pipe joint (25) of the simulation oil duct square tube (24) in the oil duct model (10); flow control valve (17); oil pump (18); installing flowmeter (15); connect by leather hose between the stainless-steel tube two ends of temperature controller (16); simulation oil duct square tube (24) in the oil duct model (10) is the plexi-glass tubular of long 600～650mm; the cross section is a rectangle; its length is 85～95mm; wide is 15～20mm; two disc electrodes (23; 26) be separately positioned on the upper and lower surface place of simulating oil duct square tube (24); be equiped with the organic glass seal pad and the pipe joint (25) of band central through hole respectively at the two ends of simulation oil duct square tube (24); in simulation oil duct square tube (24), be full of the insulating oil that transformer is used; be equiped with flow control valve (17) in the exit of oil pump (18); between flow control valve (17) and flowmeter (15), temperature controller (16) is housed; temperature controller (16) comprises thermopair and heating resistor and the digital displaying temperature instrument that is installed in the stainless-steel tube; heating resistor is electrically connected with the 220V city by thermopair and lead; thermopair is connected with the digital displaying temperature instrument by signal wire; metal particle is the stainless steel bead of diameter 1～2mm; it is positioned over the interior impeller place of oil pump (18); start oil pump (18); metal particle flows to into oil duct model (10) with oil and is suspension; mobile status; ultra-high frequency antenna (11) is installed on the outer lower wall of shelf depreciation generating means (9); and be connected with wideband high speed vast capacity digital storage oscilloscope (14) by concentric cable (13); shelf depreciation generating means (9) and ultra-high frequency antenna (11) are installed in the metallic shielded room (7); disc electrode (23) is connected with high-voltage connection (6) with spherical shield cover (19) and insulating sleeve (8) by high tension terminal (20); another disc electrode (26) is connected with noninductive detection resistance (12) one ends; and be connected noninductive detection resistance (12) other end ground connection with wideband high speed vast capacity digital storage oscilloscope (14) by concentric cable (13).
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| CN2009101908874A CN101793939B (en) | 2009-09-18 | 2009-09-18 | Partial discharge simulation experiment device of suspended metal particles in oil of transformer |
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| CN102262204A (en) * | 2011-06-10 | 2011-11-30 | 河南电力试验研究院 | Local discharge detection system applicable to detection of phase-resolved partial discharge pattern (PRPD) and time-resolved partial discharge pattern (TRPD) |
| CN102508124B (en) * | 2011-10-18 | 2013-12-25 | 广西电网公司电力科学研究院 | Detection method of partial discharge of electrical equipment |
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