CN104375071A - Decomposition simulation experiment method for sulfur hexafluoride gas insulating medium electro-thermo combination - Google Patents
Decomposition simulation experiment method for sulfur hexafluoride gas insulating medium electro-thermo combination Download PDFInfo
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- CN104375071A CN104375071A CN201410705155.5A CN201410705155A CN104375071A CN 104375071 A CN104375071 A CN 104375071A CN 201410705155 A CN201410705155 A CN 201410705155A CN 104375071 A CN104375071 A CN 104375071A
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Abstract
The invention discloses a decomposition simulation experiment method for sulfur hexafluoride gas insulating medium electro-thermo combination. A decomposition experiment system for sulfur hexafluoride under the application number 201310551600.2 is used, and the method includes the steps of examining seal performance of the experiment system, cleaning a cylinder and performing SF6 gas filling. The method further includes the following steps that the maximum externally exerted experiment voltage Umax is measured, a parallel-plate electrode and a heating body are installed, initial discharging voltage Ust is measured, the initial decomposition temperature T0 of SF6 is measured when experiment voltage U=0.5 Ust, and an decomposition experiment is performed on SF6 at different temperatures when the experiment voltage U=0.5 Ust. The method has the advantages that the failure state of electro-thermo combination in SF6 gas insulation electrical equipment can be simulated, the defects that an existing experiment method and an existing evaluation method evaluate the state of the SF6 insulation electrical equipment through detecting components of SF6 decomposed gas, and take a discharging failure or an overheating failure in the SF6 gas insulation electrical equipment into consideration instead of both the discharging failure and the overheating failure are overcome, and the accuracy of judging the failures of the SF6 gas insulation electrical equipment is improved.
Description
Technical field
The present invention relates to a kind of gas-insulated medium, be specifically related to a kind of sulfur hexafluoride (SF
6) gas-insulated medium decomposition analogue experiment method.
Background technology
SF
6gas-insulated equipment (as gas-insulated switch GIS and gas-insulated transformer GIT etc.) because it is stable, compact conformation and the little advantage of maintenance workload, in the construction and transformation of modern power network, be widely used, and progressively one of major equipment becoming modern power network.Although SF
6gas-insulated equipment reliability of operation is higher than other common electrical equipments; but operating experience shows: its inner conductive joint usually there will be loose contact because of problems such as manufacture, mounting processs; contact resistance is caused to become large; contact point can cause abnormal heating and then bring out local overheating fault (Partial Over-thermal Fault under normal working current effect; be called for short POF), due to SF
6the special construction that gas-insulated equipment is inner, makes also do not have a kind of monitoring method effectively can monitoring POF fault at present.Under the effect of POF, SF
6the primary insulation medium SF of gas insulated electric apparatus inside
6can occur to decompose and generate various low-fluorine sulfide SF
x, these SF
xthe micro-H that can mix with device interior
2o and O
2various feature decomposition product is generated as SO Deng the reaction that series of complex occurs
2f
2, SOF
2, SO
2, H
2s, CO
2and CF
4deng, and there is substantial connection in the malfunction of these characteristics of decomposition products and content and POF.
Chinese patent literature CN102495319A discloses a kind of analogue experiment method of overheat faults of contact surface in sulfur hexafluoride gas insulation equipment on June 13rd, 2012, comprises following key step:
1, the sealing property of checking experiment device
Open pressure vacuum gauge ball valve and the vacuum pump ball valve of experimental provision, then vacuum pump is started, the cylinder body of experimental provision is vacuumized, when the vacuum tightness in cylinder body is 0.005 ~ 0.01MPa, close described vacuum pump ball valve and vacuum pump successively, leave standstill the pressure vacuum gauge registration of observation experiment device again after 10 ~ 12 hours, when described pressure vacuum gauge registration remains on 0.005 ~ 0.012MPa, show that experimental provision sealing is under vacuum conditions intact; Open the SF of experimental provision again
6the valve of gas cylinder and air inlet ball valve, be filled with SF in the cylinder body of experimental provision
6gas, till described cylinder body internal gas pressure reaches 0.2 ~ 0.3MPa, then closes described SF successively
6the valve of gas cylinder and air inlet ball valve, leave standstill and observe pressure vacuum gauge registration again in 10 ~ 12 hours, when pressure vacuum gauge registration remains on 0.195 ~ 0.3MPa, show that the sealing of experimental provision under barotropic state is intact.
2, cylinder body is cleaned
First open vacuum pump ball valve, start vacuum pump, the cylinder body of experimental provision is vacuumized, when the vacuum tightness in cylinder body is 0.005 ~ 0.01MPa, closes vacuum pump ball valve and vacuum pump successively, then open the SF of experimental provision
6the valve of gas cylinder and air inlet ball valve, be filled with SF in the cylinder body of experimental provision
6gas, until when cylinder body internal gas pressure value is 0.15 ~ 0.25MPa, then close described SF successively
6the valve of gas cylinder and air inlet ball valve, clean the cylinder body of experimental provision.By aforementioned operation step, first vacuumize, then be filled with SF
6purge of gas, after so repeating flushing 2 ~ 5 times, vacuumizes described cylinder body again, then leaves standstill 10 ~ 12h, makes the SF of attachment in described cylinder body
6the decomposition gas of gas and moisture fully gasify release, are then first filled with SF
6gas, then vacuumize.
3, SF is filled with
6gas
After cleaning cylinder body, open the SF of experimental provision
6the valve of gas cylinder and air inlet ball valve, be filled with SF in the cylinder body of experimental provision
6gas, till air pressure is 0.1 ~ 0.4MPa, then closes described SF successively
6the valve of gas cylinder and air inlet ball valve.
4, the simulated experiment of Superheated steam drier is carried out.
The weak point that above-mentioned experimental technique exists is: it can only be tested the sulfur hexafluoride gas decomposition of Superheated steam drier.But the SF in actual motion
6during gas-insulated equipment inner generation POF, trouble spot not only has the effect of the high heat in local, also can be in high field intensity region simultaneously.I.e. electricity-Re coexisting state.Although the POF that joint area causes due to loose contact generally can not supervene discharging fault simultaneously, due to can SF be caused under the effect of localized hyperthermia
6gas-insulated medium and high-pressure metal conductive surface generation thermal ionization, form free thermoelectron, various charged particle and molecular fragment, the heat of ionization electronics produced and charged particle will regain energy and accelerate under the intrinsic highfield effect of fault point, after the energy of electron accumulation acquires a certain degree, just can there is electron impact ionization, aggravate SF further
6the decomposition of gas-insulated medium.Therefore, as the SF in actual motion
6when there is POF in gas-insulated equipment, SF
6decomposition be actually the coefficient result of localized hyperthermia's thermal field that inner intrinsic highfield and fault formed.
Chinese patent literature CN101059485A discloses a kind of sulfur hexafluoride discharge decomposition components analytic system and using method thereof on October 24th, 2007, and this method of testing comprises the steps: 1) with vacuum pump, sulfur hexafluoride discharge decomposer is vacuumized; 2) by air inlet needle-valve, SF is poured to sulfur hexafluoride discharge decomposer
6gas; 3) measure and maximumly outer execute experimental voltage and initial PD voltage; 4) PD under Different electrodes is produced; 5) gas is gathered; 6) gas composition analysis; 7) gather PD pulse signal waveform, and carry out fault diagnosis and pattern-recognition.The weak point that this method of testing exists is: it is tested the sulfur hexafluoride gas decomposition in discharge process, considers " heat " effect that discharge process is adjoint.
If utilizing SF
6when decomposition components carries out fault diagnosis, electric discharge and local overheating only consider one of them factor to two key elements that affect that sulfur hexafluoride gas decomposes, and ignore another key factor, the diagnostic result then drawn accordingly will there will be some deviations, for unnecessary loss served by the safe and reliable operation band of electrical network.
Summary of the invention
For existing SF
6the deficiency of gas-insulated equipment failure analogue experiment method, technical matters to be solved by this invention is just to provide a kind of decomposition analogue experiment method of sulfur hexafluoride gas-insulating medium electricity-thermal, it can in laboratory the SF such as more real Simulated GlS
6malfunction in various degree and SF in gas-insulated equipment
6decomposable process under electricity-heat effect that gas-insulated medium is adjoint in this failure process, and obtain SF in air chamber
6the data of decomposed gas component and content thereof, for improving assessment SF further
6gas-insulated equipment state of insulation provides reliable experiment basis.
Technical matters to be solved by this invention is realized by such technical scheme, its request for utilization number is " a kind of sulfur hexafluoride decomposition experiment system " of 201310551600.2, simulated experiment and analysis carried out to the decomposition of sulfur hexafluoride gas-insulating medium electricity-thermal, comprises the sealing property of checking experiment system, clean cylinder body, be filled with SF
6the step of gas, further comprising the steps of:
1, measure and maximumly outer execute experimental voltage
u max
When not placing parallel-plate electrode and heater, connecting experimental line, regulating pressure regulator, slow rising experimental voltage, examining on high-speed figure storage oscilloscope and have no signal, when there is fine discharge pulse signal, recording the applied voltage be now added on analogue experiment installation
u max;
2, parallel-plate electrode and heater are installed, measure firing potential U
st
After voltage is down to 0V by pressure regulator, closes pressure regulator switch, with ground rod, High-Voltage Experimentation equipment is discharged, open pressure vacuum gauge ball valve and vacuum pump ball valve, then start vacuum pump, cylinder body is vacuumized to the SF drained in cylinder body
6gas and decomposition gas thereof; Then open the sealing of cylinder body, by the screw thread of bushing and low-tension bushing inner wire, parallel-plate electrode is arranged between bushing and low-tension bushing, and adjusts to suitable height; By two wiring poles of the heater of aluminium or cathode copper material, be connected with two heater binding posts of binding post mounting flange respectively by rigid insulation copper conductor, and described heater be supported on the central axis place of two described parallel-plate electrodes by insulation column; Heater temperature sensor is arranged on the side of described heater, is connected respectively at the two ends of described heater temperature sensor, finally covers the sealing of cylinder body by wire with two heater temperature sensor binding posts of binding post mounting flange;
Again through checking experiment system sealing property, clean cylinder body, be filled with SF
6after gas, when disconnecting thermode control circuit, connect experimental circuit, regulate pressure regulator, slow rising experimental voltage, examining on high-speed figure storage oscilloscope and have no signal, when there is fine discharge pulse signal, recording the applied voltage U be now added on analogue experiment installation
st;
3, experimental voltage is U=0.5U
sttime, measure SF
6temperature of initial decomposition T
0
After voltage is down to 0V by pressure regulator, closes pressure regulator switch, with ground rod, High-Voltage Experimentation equipment is discharged; Through cleaning cylinder body, be filled with SF
6after gas, connect experimental circuit, regulate pressure regulator, slow rising is applied to the voltage extremely experiment required voltage value U between parallel-plate electrode, regulate intelligent digital humidostat again, setting experiment initial temperature value T=100 DEG C, with 10 DEG C for step-length, within every 1 hour, gather gas and gas composition analysis, within every 3 hours, manually improve the setting value of a temperature; Until the SOF in the gaseous sample gathered
2when content starts to increase, record the Temperature displaying value T of intelligent digital humidostat
0, it is U=0.5U that this temperature value is experimental voltage
sttime, electricity-thermal decomposes SF in simulated experiment
6temperature of initial decomposition value;
4, experimental voltage is U=0.5U
sttime, SF under different temperatures
6decomposition experiment
After voltage is down to 0 by pressure regulator, closes pressure regulator switch, with ground rod, High-Voltage Experimentation equipment is discharged; Implement cleaning cylinder body and be filled with SF
6gas, connects experimental circuit, regulates pressure regulator, slowly raises the voltage extremely experiment required voltage value U be applied between parallel-plate electrode, then regulates intelligent digital humidostat to desired temperature: from SF
6temperature of initial decomposition value T
0start to 500 DEG C, T is set
1, T
2, T
3t
10totally 10 desired temperatures; Intelligent digital humidostat described in manual adjustments is to desired temperature T
1after, intelligent digital humidostat regulates the surface heat temperature of described heater to T automatically
1carry out experiment in 10 hours, gather gas and gas composition analysis every 1 hour;
Desired temperature T
1experiment terminate, through cleaning cylinder body, be filled with SF
6after gas, regulate pressure regulator, slow boosted voltage is to experiment required voltage value U, and the intelligent digital humidostat described in manual adjustments is to desired temperature T
2, carry out experiment in 10 hours, gathered gas and gas composition analysis every 1 hour;
Desired temperature T
2experiment terminate, through cleaning cylinder body, be filled with SF
6after gas, so repeat experiment, record desired temperature T respectively
3, T
4t
10under SF
6the data of gas decomposition components and content thereof; The T that last basis detects
1~ T
10under decomposed gas component in SO
2f
2, SOF
2, SO
2, CO
2, CF
4content, when to draw out experimental voltage be U, SF
6the relation curve of gas decomposition components and heater surface heat temperature.
After adopting technique scheme, the present invention has following technique effect:
SF can be simulated
6the malfunction of electricity-thermal in gas insulated electric apparatus, compensate for existing by detecting SF
6decomposed gas component assessment SF
6experimental technique and the appraisal procedure of insulation electrical equipment state only consider SF
6discharging fault or Superheated steam drier in gas insulated electric apparatus and do not consider the two simultaneous deficiency, improve SF
6the accuracy of gas insulated electric apparatus breakdown judge.For in scientific research, teaching, institute and device fabrication producer and electric system to SF
6the theoretical analysis that gas insulated electric apparatus presence detects and applied research provide a kind of simple method of testing.
Accompanying drawing explanation
Accompanying drawing of the present invention is described as follows:
Fig. 1 is the theory diagram that the present invention utilizes experimental system;
Fig. 2 is the structural representation of electricity-thermal failure simulation device that the present invention utilizes;
Fig. 3 is the vertical view of Fig. 2;
Fig. 4 is the CF that embodiment 1 detects
4the change curve of content;
Fig. 5 is the CO that embodiment 1 detects
2the change curve of content;
Fig. 6 is the SO that embodiment 1 detects
2f
2the change curve of content;
Fig. 7 is the SOF that embodiment 1 detects
2the change curve of content;
Fig. 8 is the SO that embodiment 1 detects
2the change curve of content.
In Fig. 1, Fig. 2 and Fig. 3: 1, pressure regulator, 5, bushing, 6, cylinder body, 7, plate electrode, 8, heater, 9, heater temperature sensor, 10, low-tension bushing, 12, digital oscilloscope, 15, intelligent digital displays temperature adjusting apparatus, 17, heater control loop power switch, 18, electricity-thermal fault simulation experimental provision, 19, SF
6gas cylinder, 20, air inlet ball valve, 21, sampling ball valve, 22, gas chromatograph-mass spectrometer, 23, vacuum pump ball valve, 24, vacuum pump, 26, heater binding post, 27, heater temperature sensor binding post, 28, pressure vacuum gauge, 29, pressure vacuum gauge ball valve, 31, binding post mounting flange.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment 1
Request for utilization of the present invention number is " a kind of sulfur hexafluoride decomposition experiment system " of 201310551600.2, simulated experiment and analysis carried out to the decomposition of sulfur hexafluoride gas-insulating medium electricity-thermal, comprises the sealing property of checking experiment system, clean cylinder body, be filled with SF
6the step of gas:
The sealing property of checking experiment system: as shown in Figure 2, open pressure vacuum gauge ball valve 29 and the vacuum pump ball valve 23 of this device, then vacuum pump 24 is started, the cylinder body 6 of this device is vacuumized, when the vacuum tightness in cylinder body 6 is 0.005 ~ 0.01MPa, close vacuum pump ball valve 23 and vacuum pump 24 successively, leave standstill pressure vacuum gauge 28 registration of observing this device after 10 ~ 12 hours again, when described pressure vacuum gauge 28 registration remains on 0.005 ~ 0.01MPa, show that this device sealing is under vacuum conditions intact; Open the SF of this device again
6the valve of gas cylinder 19 and air inlet ball valve 20, be filled with SF in this device cylinder body
6gas, till described cylinder body internal gas pressure reaches 0.2 ~ 0.3MPa, then closes described SF successively
6the valve of gas cylinder 19 and air inlet ball valve 20, leave standstill and within 10 ~ 12 hours, observe pressure vacuum gauge 28 registration again, when pressure vacuum gauge 28 registration remains on 0.2 ~ 0.3MPa, show that the described electricity-sealing of heat integration decomposition analogue experiment installation under barotropic state is intact.
Cleaning cylinder body: first open vacuum pump ball valve 23, start vacuum pump 24, the cylinder body 6 electricity shown in Fig. 2-thermal being decomposed to analogue experiment installation vacuumizes, when the vacuum tightness in described cylinder body is 0.005 ~ 0.01MPa, close vacuum pump ball valve 23 and vacuum pump 24 successively, then open SF
6the valve of gas cylinder 19 and air inlet ball valve 20, be filled with SF in cylinder body 6
6gas, until when cylinder body 6 internal gas pressure value is 0.1MPa, then close SF successively
6the valve of gas cylinder 19 and air inlet ball valve 20, clean the cylinder body 6 shown in Fig. 2.By aforementioned operation step, first vacuumize, then be filled with SF
6purge of gas, after so repeating flushing 2 ~ 3 times, vacuumizes described cylinder body again, then leaves standstill 10 ~ 12h, makes the SF of attachment in described cylinder body
6the decomposition gas of gas and moisture fully gasify release, are then first filled with SF
6gas, then vacuumize, to be washed by the impurity of release of gasifying in standing process, ensure that in cylinder body, foreign gas and inherent moisture content reduce to minimum.
Be filled with SF
6gas: open SF
6the valve of gas cylinder 19 and air inlet ball valve 20, be filled with SF in the cylinder body 6 shown in Fig. 2
6gas, till air pressure is 0.1 ~ 0.4MPa, then closes described SF successively
6the valve of gas cylinder 19 and air inlet ball valve 20.
Further comprising the steps of:
1, measure and maximumly outer execute experimental voltage
u max
On inspection experimental system sealing property, clean cylinder body, be filled with SF
6after gas, when not placing plate electrode 7 and heater 8 and heater temperature sensor 9, as shown in Figure 1, connect experimental line, regulate pressure regulator 1, slowly raise experimental voltage, examine on high-speed figure storage oscilloscope 12 and have no signal, when there is fine discharge pulse signal, recording the applied voltage be now added on analogue experiment installation and (being
u max), the applied voltage that this magnitude of voltage is the highest in experimentation after being, namely simulated experiment voltage can not exceed this magnitude of voltage, otherwise the PD signal that the electric heating field that the local discharge signal produced by experimental provision itself can be formed with parallel-plate electrode and heater causes obscured, cause experimental result inaccurate, even whether None-identified is the PD signal that electric heating field that parallel-plate electrode and heater are formed causes.
2, parallel-plate electrode and heater are installed, measure firing potential U
st
As shown in Figure 1, Figure 2 and Figure 3, after voltage is down to 0V by pressure regulator 1, closes pressure regulator switch, with ground rod, High-Voltage Experimentation equipment is discharged, then open vacuum pump ball valve 23, then start vacuum pump 24, cylinder body is vacuumized to the SF drained in cylinder body
6gas and decomposition gas thereof, then the sealing of cylinder body 6 is opened, by the screw thread of bushing 5 and low-tension bushing 10 inner wire, plate electrode 7 is arranged between bushing 5 and low-tension bushing 10, and adjust to suitable height, by two wiring poles of the heater 8 of aluminium material, be connected with two heater binding posts 26 of binding post mounting flange 31 respectively by rigid insulation copper conductor, and by insulation column, described heater is supported on the central axis place of two described plate electrodes 7, heater temperature sensor 9 is arranged on the side of described heater 8, the two ends of described heater temperature sensor 9 are connected with two heater temperature sensor binding posts 27 of binding post mounting flange 31 respectively by wire, then sealing is covered,
Again through checking experiment system sealing property, clean cylinder body, be filled with SF
6after gas, when disconnecting heater 8 control circuit, connect experimental circuit, regulate pressure regulator, slow rising experimental voltage, examining on high-speed figure storage oscilloscope 12 and have no signal, when there is fine discharge pulse signal, recording the applied voltage U be now added on electricity-thermal fault simulation experimental provision 18
st, this voltage is as experiment starting potential.
3, experimental voltage is U=0.5U
sttime, measure SF
6temperature of initial decomposition T
0
After voltage is down to 0V by pressure regulator 1, closes pressure regulator switch, with ground rod, High-Voltage Experimentation equipment is discharged; Through cleaning cylinder body, be filled with SF
6after gas, connect experimental circuit, regulate pressure regulator 1, slow rising is applied to the voltage extremely experiment required voltage value U between parallel-plate electrode, regulate intelligent digital humidostat 15 again, setting experiment initial temperature value T=100 DEG C, with 10 DEG C for step-length, within every 1 hour, gather gas and gas composition analysis, within every 3 hours, manually improve the setting value of a temperature;
After one time temperature experiment terminates, through cleaning cylinder body, be filled with SF
6after gas, then carry out temperature experiment next time; Until the SOF in the gaseous sample gathered
2when content starts to increase, record the Temperature displaying value of intelligent digital humidostat, be designated as T
0, it is U=0.5U that this temperature value is experimental voltage
sttime, electricity-thermal decomposes SF in simulated experiment
6temperature of initial decomposition value.
4, experimental voltage is U=0.5U
sttime, SF under different temperatures
6decomposition experiment
After voltage is down to 0 by pressure regulator 1, closes pressure regulator switch, with ground rod, High-Voltage Experimentation equipment is discharged; Through cleaning cylinder body, be filled with SF
6after gas, connect experimental circuit, regulate pressure regulator 1, slowly raise experimental voltage to setting value U, then regulate intelligent digital humidostat 15 to desired temperature T: from temperature of initial decomposition T
0start to 500 DEG C, T is set
1, T
2, T
3t
10totally 10 desired temperatures; Intelligent digital humidostat 15 described in manual adjustments is to experiment setting value T
1after, the surface heat temperature of the heater 8 described in intelligent digital humidostat 15 regulates automatically is to T
1carry out experiment in 10 hours, gather gas and gas composition analysis every 1 hour;
Desired temperature T
1experiment terminate, through cleaning cylinder body, be filled with SF
6after gas, regulate pressure regulator 1, slow boosted voltage is to experiment required voltage value U, intelligent digital humidostat 15 to the desired temperature T described in manual adjustments
2, carry out experiment in 10 hours, gathered gas and gas composition analysis every 1 hour;
Desired temperature T
2experiment terminate, through cleaning cylinder body, be filled with SF
6after gas, so repeat experiment, record desired temperature T respectively
3, T
4t
10under SF
6the data of gas decomposition components and content thereof; The T that last basis detects
1~ T
10under SF
6sO in gas decomposition components
2f
2, SOF
2, SO
2, CO
2, CF
4content, when to draw out experimental voltage be U, SF
6the relation curve of gas decomposition components and heater 8 surface heat temperature, as shown in Fig. 4 ~ 8.
As seen from Figure 4, CF
4content raises with temperature and increases, and is being greater than under the temperature conditions of 420 DEG C, CF
4content sharply increases.As seen from Figure 5, CO
2content raises with temperature and increases, and occurs flex point at 340 DEG C of places, being greater than after 340 DEG C, and CO
2the amplification of content strengthens.As seen from Figure 6, SO
2f
2content raises with temperature and increases, SO between 400 DEG C ~ 480 DEG C
2f
2the amplification of content is larger.As seen from Figure 7, SOF
2content raises with temperature and increases, and temperature is higher, SOF
2the amplification of content also strengthens.As seen from Figure 8, SO
2content raises with temperature and increases, and is being greater than under the temperature conditions of 380 DEG C, SO
2content sharply increases.
Utilize SF
6the relation curve of gas decomposition components and heater surface heat temperature, can analyze when experimental voltage is U, SF
6the relation of gas decomposition components and heater surface heat temperature, SF
6the relation of gas decomposition rate and heater surface heat temperature, thus according to SF under equipment actual conditions
6the order of severity of the situation judgment device fault that gas decomposes.
Embodiment 2
As different from Example 1, embodiment 2 also comprises embodiment 2:
5, experimental temperature is T
0time, SF under different experiments voltage
6decomposition experiment
After voltage is down to 0V by pressure regulator, closes pressure regulator switch, with ground rod, High-Voltage Experimentation equipment is discharged; Through cleaning cylinder body, be filled with SF
6after gas, connect experimental circuit, the intelligent digital humidostat described in manual adjustments is to SF
6temperature of initial decomposition value T
0; Regulating pressure regulator again, slowly raising the voltage that is applied between parallel-plate electrode to testing setting value: U
1=0.3U
st, U
2=0.4U
st, U
3=0.5U
st, U
4=0.6U
st, U
5=0.7U
st, U
6=0.8U
st, U
7=0.9U
st, U
8=U
st, U
9=1.1U
st, U
10=1.2U
sttotally 10 experiment setting values; At experimental voltage value U
1carry out the experiment of 96 hours under condition, gather gas and gas composition analysis every 12 hours;
Experiment setting value U
1experiment terminate, through cleaning cylinder body, be filled with SF
6after gas, connect experimental circuit, the intelligent digital humidostat described in manual adjustments is to SF
6temperature of initial decomposition value T
0, regulate pressure regulator, slow boosted voltage is to experiment required voltage value U
2, carry out the experiment of 96 hours, gathered gas and gas composition analysis every 12 hours;
Experiment setting value U
2experiment terminate, through cleaning cylinder body, be filled with SF
6after gas, so repeat experiment, record experiment setting value U respectively
3, U
4u
10under SF
6the data of gas decomposition components and content thereof, the last U according to detecting
1~ U
10under SF
6sO in gas decomposition components
2f
2, SOF
2, CO
2, SO
2, CF
4content, draw out SF
6temperature of initial decomposition value T
0time, SF
6the relation curve of gas decomposition components and experimental voltage U.
Utilize SF
6the relation curve of gas decomposition components and experimental voltage U, can analyze at SF
6temperature of initial decomposition value T
0time, SF
6the relation of gas decomposition components and experimental voltage U, the relation of decomposition rate and experimental voltage U, thus according to SF under equipment actual conditions
6the order of severity of the situation judgment device fault that gas decomposes.
Described collection gas and gas composition analysis comprise: after voltage is down to 0V, close pressure regulator 1 switch, close heater control loop power switch 17 again, finally with ground rod, High-Voltage Experimentation equipment is discharged, then open described sampling ball valve 21, allow gas slowly enter sampler bag to the micro-drum of sampler bag, close sampling ball valve 21, the gas of collection is sent into the gas chromatograph-mass spectrometer 22 of this device, to SF
6the decomposition components of gas and content thereof carry out detecting and record.
This method invention, by arranging experimental voltage and heater temperature, can control described heater surrounding electric field intensity and its surface heat temperature; Also by placing the following two kinds of situations of heating physical efficiency simulation of unlike material:
1, the voltage U between same parallel-plate electrode, when same surface heat temperature T, changes the material of heater, makes SF
6gas decomposes, and experimenter is by the SF testing gained
6the data such as the component of decomposition gas and content, draw out SF
6the relation curve of gas decomposition components and heater material, finds out voltage U between same parallel-plate electrode, SF under same heater surface heat temperature action
6the relation of the component of decomposition gas and content and heater material.
2, the voltage U between same parallel-plate electrode, when same surface heat temperature T and different heat body material, makes SF
6gas decomposes, with 1 hour for interval, get fixed 10 gaseous sample acquisition times, also namely at the experimentation repeated acquisition gaseous sample 10 times of 10 hours, experimenter by the voltage U between same parallel-plate electrode, SF in the different tests time under the heater effect of same heater surface heat temperature T and unlike material
6the data such as the component of decomposition gas and content, draw out SF
6relation curve between gas decomposition components and heater material and test period, finds out the SF under identical heater surface heat temperature action
6relation between the component of decomposition gas and content and heater material and test period.
Claims (3)
1. the decomposition analogue experiment method of sulfur hexafluoride gas-insulating medium electricity-thermal, request for utilization number is " a kind of sulfur hexafluoride decomposition experiment system " of 201310551600.2, simulated experiment and analysis carried out to the decomposition of sulfur hexafluoride gas-insulating medium electricity-thermal, comprises the sealing property of checking experiment system, clean cylinder body, be filled with SF
6the step of gas, is characterized in that further comprising the steps of:
Step 1, measure and maximumly outer execute experimental voltage
u max
When not placing parallel-plate electrode and heater, connecting experimental line, regulating pressure regulator, slow rising experimental voltage, examining on high-speed figure storage oscilloscope and have no signal, when there is fine discharge pulse signal, recording the applied voltage be now added on analogue experiment installation
u max;
Step 2, installation parallel-plate electrode and heater, measure firing potential U
st
After voltage is down to 0V by pressure regulator, closes pressure regulator switch, with ground rod, High-Voltage Experimentation equipment is discharged, open pressure vacuum gauge ball valve and vacuum pump ball valve, then start vacuum pump, cylinder body is vacuumized to the SF drained in cylinder body
6gas and decomposition gas thereof; Then open the sealing of cylinder body, by the screw thread of bushing and low-tension bushing inner wire, parallel-plate electrode is arranged between bushing and low-tension bushing, and adjusts to suitable height; By two wiring poles of the heater of aluminium or cathode copper material, be connected with two heater binding posts of binding post mounting flange respectively by rigid insulation copper conductor, and described heater be supported on the central axis place of two described parallel-plate electrodes by insulation column; Heater temperature sensor is arranged on the side of described heater, is connected respectively at the two ends of described heater temperature sensor, finally covers the sealing of cylinder body by wire with two heater temperature sensor binding posts of binding post mounting flange;
Again through checking experiment system sealing property, clean cylinder body, be filled with SF
6after gas, when disconnecting thermode control circuit, connect experimental circuit, regulate pressure regulator, slow rising experimental voltage, examining on high-speed figure storage oscilloscope and have no signal, when there is fine discharge pulse signal, recording the applied voltage U be now added on analogue experiment installation
st;
Step 3, experimental voltage are U=0.5U
sttime, measure SF
6temperature of initial decomposition T
0
After voltage is down to 0V by pressure regulator, closes pressure regulator switch, with ground rod, High-Voltage Experimentation equipment is discharged; Through cleaning cylinder body, be filled with SF
6after gas, connect experimental circuit, regulate pressure regulator, slow rising is applied to the voltage extremely experiment required voltage value U between parallel-plate electrode, regulate intelligent digital humidostat again, setting experiment initial temperature value T=100 DEG C, with 10 DEG C for step-length, within every 1 hour, gather gas and gas composition analysis, within every 3 hours, manually improve the setting value of a temperature; Until the SOF in the gaseous sample gathered
2when content starts to increase, record the Temperature displaying value T of intelligent digital humidostat
0, it is U=0.5U that this temperature value is experimental voltage
sttime, electricity-thermal decomposes SF in simulated experiment
6temperature of initial decomposition value;
Step 4, experimental voltage are U=0.5U
sttime, SF under different temperatures
6decomposition experiment
After voltage is down to 0 by pressure regulator, closes pressure regulator switch, with ground rod, High-Voltage Experimentation equipment is discharged; Implement cleaning cylinder body and be filled with SF
6gas, connects experimental circuit, regulates pressure regulator, slowly raises the voltage extremely experiment required voltage value U be applied between parallel-plate electrode, then regulates intelligent digital humidostat to desired temperature: from SF
6temperature of initial decomposition value T
0start to 500 DEG C, T is set
1, T
2, T
3t
10totally 10 desired temperatures; Intelligent digital humidostat described in manual adjustments is to desired temperature T
1after, intelligent digital humidostat regulates the surface heat temperature of described heater to T automatically
1carry out experiment in 10 hours, gather gas and gas composition analysis every 1 hour;
Desired temperature T
1experiment terminate, through cleaning cylinder body, be filled with SF
6after gas, regulate pressure regulator, slow boosted voltage is to experiment required voltage value U, and the intelligent digital humidostat described in manual adjustments is to desired temperature T
2, carry out experiment in 10 hours, gathered gas and gas composition analysis every 1 hour;
Desired temperature T
2experiment terminate, through cleaning cylinder body, be filled with SF
6after gas, so repeat experiment, record desired temperature T respectively
3, T
4t
10under SF
6the data of gas decomposition components and content thereof; The T that last basis detects
1~ T
10under decomposed gas component in SO
2f
2, SOF
2, SO
2, CO
2, CF
4content, when to draw out experimental voltage be U, SF
6the relation curve of gas decomposition components and heater surface heat temperature.
2. the decomposition analogue experiment method of sulfur hexafluoride gas-insulating medium electricity-thermal according to claim 1, is characterized in that further comprising the steps of:
Step 5, experimental temperature are T
0time, SF under different experiments voltage
6decomposition experiment
After voltage is down to 0V by pressure regulator, closes pressure regulator switch, with ground rod, High-Voltage Experimentation equipment is discharged; Through cleaning cylinder body, be filled with SF
6after gas, connect experimental circuit, the intelligent digital humidostat described in manual adjustments is to SF
6temperature of initial decomposition value T
0; Regulating pressure regulator again, slowly raising the voltage that is applied between parallel-plate electrode to testing setting value: U
1=0.3U
st, U
2=0.4U
st, U
3=0.5U
st, U
4=0.6U
st, U
5=0.7U
st, U
6=0.8U
st, U
7=0.9U
st, U
8=U
st, U
9=1.1U
st, U
10=1.2U
sttotally 10 experiment setting values; At experimental voltage value U
1carry out the experiment of 96 hours under condition, gather gas and gas composition analysis every 12 hours;
Experiment setting value U
1experiment terminate, through cleaning cylinder body, be filled with SF
6after gas, connect experimental circuit, the intelligent digital humidostat described in manual adjustments is to SF
6temperature of initial decomposition value T
0, regulate pressure regulator, slow boosted voltage is to experiment required voltage value U
2, carry out the experiment of 96 hours, gathered gas and gas composition analysis every 12 hours;
Experiment setting value U
2experiment terminate, through cleaning cylinder body, be filled with SF
6after gas, so repeat experiment, record experiment setting value U respectively
3, U
4u
10under SF
6the data of gas decomposition components and content thereof, the last U according to detecting
1~ U
10under SF
6sO in gas decomposition components
2f
2, SOF
2, CO
2, SO
2, CF
4content, draw out SF
6temperature of initial decomposition value T
0time, SF
6the relation curve of gas decomposition components and experimental voltage U.
3. the decomposition analogue experiment method of sulfur hexafluoride gas-insulating medium electricity-thermal according to claim 1 and 2, it is characterized in that, described collection gas and gas composition analysis comprise: after voltage is down to 0V, close pressure regulator switch, close heater control loop power switch again, finally with ground rod, High-Voltage Experimentation equipment is discharged, then described sampling ball valve is opened, gas is allowed slowly to enter sampler bag to the micro-drum of sampler bag, close sampling ball valve, the gas of collection is sent into the gas chromatograph-mass spectrometer of this device, to SF
6the decomposition components of gas and content thereof carry out detecting and record.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410705155.5A CN104375071A (en) | 2014-12-01 | 2014-12-01 | Decomposition simulation experiment method for sulfur hexafluoride gas insulating medium electro-thermo combination |
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| CN104375071A true CN104375071A (en) | 2015-02-25 |
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ID=52554108
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|---|---|---|---|
| CN201410705155.5A Pending CN104375071A (en) | 2014-12-01 | 2014-12-01 | Decomposition simulation experiment method for sulfur hexafluoride gas insulating medium electro-thermo combination |
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Application publication date: 20150225 |