CN105182204A - SF6 electrical equipment state detection method and simulation detection device - Google Patents

SF6 electrical equipment state detection method and simulation detection device Download PDF

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CN105182204A
CN105182204A CN201510646464.4A CN201510646464A CN105182204A CN 105182204 A CN105182204 A CN 105182204A CN 201510646464 A CN201510646464 A CN 201510646464A CN 105182204 A CN105182204 A CN 105182204A
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concentration
electrode
electrical equipment
device status
electrical device
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CN105182204B (en
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王宇
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Abstract

The invention relates to an SF6 electrical equipment state detection method and simulation detection device. The invention provides a new marker CO2 for detecting an SF6 electrical equipment state, which can be used as a gas maker to be applied to SF6 electrical equipment state detection. The new gas marker CO2 is discovered by analyzing gas components of faulted SF6 electrical equipment; the inner operation state of the SF6 electrical equipment can be effectively determined by detecting the CO2 concentration of contents of the SF6 electrical equipment. Compared with a traditional detection method of detecting gas markers such as CF4, SO2, SOF2, SO2F2, etc., the detection method of the invention is simpler, and can obtain more sensitive, effective and reliable results.

Description

SF 6the detection method of electrical device status and analoging detecting device
Technical field
The present invention relates to electric field, especially relate to a kind of SF 6the detection method of electrical device status and analoging detecting device.
Background technology
Sulfur hexafluoride (SF 6) be at normal temperatures and pressures a kind of colourless, tasteless, nontoxic, do not fire, the forming gas of chemical property stabilizer pole.SF 6molecule be the symmetrical structure of single sulphur polyfluoro, there is extremely strong electronegativity, thus give its excellent electrical isolation and arc extinction performance.At present, SF 6as the insulating medium of a new generation, be widely used in high pressure, extra-high voltage electrical equipment.Fill SF 6electrical equipment (i.e. SF 6electrical equipment) floor area is few, running noises is little, without fire hazard, drastically increases the safe reliability of electric equipment operation.
SF 6gas is under the effect of overheated, electric arc, electric spark and corona discharge, and can decompose, its decomposition product also can react with the micro-moisture in equipment, electrode and solid insulating material, and its product more complicated, has gaseous impurities, as carbon tetrafluoride (CF 4), fluoridize sulfonyl (SO 2f 2), fluoridize thionyl (SOF 2), sulphuric dioxide (SO 2) etc., also have some solid impurities, as aluminum fluoride (AlF 3), tungsten fluoride (WF 6) etc., concrete decomposition approach is as follows:
For operating electrical equipment, judging its device interior running status relative difficulty, detecting SF by analyzing 6the decomposition product of gas judges SF 6strong means of inside electric appliance ruuning situation.In recent years, SF 6cF in gas 4and SO 2be widely recognized as Deng decomposition product and can be used for the mark of judgment device internal operation state.CF 4at SF 6exist in production process, need in conjunction with SO 2index is used together, and SO 2in actual motion equipment, often violent growth suddenly, for operation maintenance personnel, probably can not capture in time, cause the Best Times missing treatment facility defect.Moreover, CF 4and SO 2deng decomposition product complicated component, corresponding inside electric appliance state differs, and needs in conjunction with other mark to judge the state of inside electric appliance.
Summary of the invention
Based on this, be necessary to provide a kind of convenient SF detected 6the detection method of electrical device status and analoging detecting device.
The present invention proposes a kind of detection SF 6the new mark of electrical device status, i.e. CO 2(carbon dioxide), CO 2can be used as gas mark and be applied in detection SF 6in electrical device status.
Present invention also offers a kind of SF 6the detection method of electrical device status, it comprises the steps:
Collect SF 6the gas sample produced in electrical equipment;
Detect CO in described gas sample 2concentration, and according to described CO 2concentration analysis described in SF 6the state of electrical equipment.
Wherein in an embodiment, described according to described CO 2concentration analysis described in SF 6the state of electrical equipment described CO detected 2concentration higher than 300 μ L/L time, and along with passage of time, described CO 2concentration sustainable growth, then may there is exception in judgment device inside.
Wherein in an embodiment, also comprise and detect CF in described gas sample 4, SO 2, SOF 2and SO 2f 2the step of concentration, and according to described CO 2concentration coordinate CF 4, SO 2, SOF 2and SO 2f 2concentration analysis described in SF 6the state of electrical equipment, works as CF 4concentration higher than 400 μ L/L, SO 2, SOF 2and SO 2f 2start to occur, and along with passage of time, CF 4, SO 2, SOF 2and SO 2f 2concentration sustainable growth, then judge described SF 6electrical equipment is abnormal.
Wherein in an embodiment, the concentration detecting each gas in described gas sample uses chromatogram analysis method to detect.
The present invention passes through SF after fault 6electrical equipment gas composition analysis, has found new gas mark CO 2, by detecting SF 6the CO of inside electric appliance 2concentration, can shift to an earlier date anticipation SF 6the running status of inside electric appliance, especially can reflect the situation relating to the damage of solid insulation surface imperfection, passes through detection CF than traditional 4, SO 2, SOF 2and SO 2f 2deng gas mark, can make defect dipoles in advance, provide grace time to equipment operation maintenance personnel and judge in advance, follow the tracks of confirmation and process defect equipment, this testing process is simpler, and result is sensitiveer, effective, reliability is high.Further, CO 2concentration easily survey, without the need to numerous and diverse checkout equipment, thus be convenient to Real-Time Monitoring SF 6electric equipment internal operation state.
In addition, present invention also offers a kind of SF 6the analoging detecting device of electrical device status, it comprises testing transformer, sleeve pipe and test cavity, described test cavity has test chamber, the first electrode and the second electrode that are oppositely arranged is provided with in described test chamber, described testing transformer is connected by described sleeve pipe with described first electrode, and described test cavity offers air intake opening and thief hatch and fills SF in described test chamber 6gas.
Wherein in an embodiment, between described first electrode and described second electrode, be provided with conductive material chip or surface imperfection type solid insulation.
Wherein in an embodiment, the distance between described first electrode and described second electrode is adjustable.
Wherein in an embodiment, in described test chamber, be also provided with adsorbent.
Wherein in an embodiment, described test cavity is provided with transparent windows.
Above-mentioned SF 6the analoging detecting device structure of electrical device status is simple, can be widely used in SF 6in the analog detection process of electrical device status, there is reliable results, advantage easy and simple to handle.
First electrode and the second electrode can be ball plate electrode group, needle plate electrode group or plate plate electrode group etc., by arranging conductive material chip (as metal fragment) or defective solid insulation (being provided with the solid insulation of the conductive materials such as tinsel as surface) between the first electrode and the second electrode, may be used for the multiple discharge defect of analog detection.
Accompanying drawing explanation
Fig. 1 is the SF of an embodiment 6the schematic flow sheet of the detection method of electrical device status;
Fig. 2 is the SF of an embodiment 6the structural representation of the analoging detecting device of electrical device status;
Fig. 3 is for using solid insulation surface metal silk creeping discharge defect model in Fig. 2 analoging detecting device.
Embodiment
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is described more fully.Preferred embodiment of the present invention is given in accompanying drawing.But the present invention can realize in many different forms, is not limited to embodiment described herein.On the contrary, provide the object of these embodiments be make the understanding of disclosure of the present invention more comprehensively thorough.
It should be noted that, when element is called as " being fixed on " another element, directly can there is element placed in the middle in it on another element or also.When an element is considered to " connection " another element, it can be directly connected to another element or may there is centering elements simultaneously.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used in the description of the invention herein just in order to describe specific embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
Present embodiment proposes a kind of detection SF 6the new mark of electric equipment state, i.e. CO 2(carbon dioxide), CO 2can be used as gas mark and be applied in detection SF 6in electrical device status.
Present embodiment additionally provides a kind of SF 6the detection method of electrical device status, as shown in Figure 1, it comprises the steps:
Step S10, collects SF 6the gas sample produced in electrical equipment.
Step S20, detects CO in gas sample 2concentration, and according to CO 2concentration analysis SF 6the state of electrical equipment.
In the present embodiment, according to CO 2concentration analysis SF 6the state of electrical equipment CO detected 2concentration higher than 300 μ L/L time, and along with passage of time, CO 2concentration sustainable growth, then may there is exception in judgment device inside.In addition, can also in conjunction with other gas composition in gas sample, as CF 4, SO 2, SOF 2and SO 2f 2isoconcentration judges SF further 6the internal state of electrical equipment, particularly detects and works as CF 4concentration higher than 400 μ L/L, SO 2, SOF 2and SO 2f 2start to occur, and along with passage of time, CF 4, SO 2, SOF 2and SO 2f 2concentration sustainable growth, then can judge described SF 6electrical equipment is abnormal, advises uncapping strip inspection.
In the present embodiment, CO in gas sample is detected 2, CF 4, SO 2, SOF 2and SO 2f 2concentration Deng gas uses chromatogram analysis method to detect, as request for utilization number " detects SF for CN201410425092.8, name are called 6the chromatogram analysis method of decomposition product " patented claim in the chromatogram analysis method mentioned, or use other conventional and easy detection method detects.
By to SF after fault 6electrical equipment gas composition analysis, has found new gas mark CO 2, by detecting SF 6the CO of electrical equipment content 2concentration, effectively can judge SF 6the running status of inside electric appliance, passes through detection CF than traditional 4, SO 2, SOF 2and SO 2f 2deng gas mark, testing process is simpler, and result is sensitiveer, effective, reliability is high.CO 2concentration easily survey, without the need to numerous and diverse checkout equipment, easy and simple to handle, practical, be convenient to Real-Time Monitoring SF 6electric equipment internal operation state.
As shown in Figure 2, present embodiment additionally provides a kind of SF 6the analoging detecting device 100 of electrical device status, it comprises testing transformer 110, sleeve pipe 120 and test cavity 130.
Resistance R is provided with between testing transformer 110 and sleeve pipe 120.Sleeve pipe 120 for playing the effect of step-down between testing transformer 110 and test cavity 130.Resistance R can be used as overload protection arrangement, when the electric current of system is excessive, can play the effect of open test transformer 110.
Test cavity 130 has test chamber 131.The first electrode 132 and the second electrode 133 is provided with in test chamber 131.Testing transformer 110 is connected by sleeve pipe 120 with the first electrode 132.First electrode 132 forms high-pressure side, and the second electrode 133 is zero potential, thus forms electric field between the first electrode 132 and the second electrode 133.In the present embodiment, between the first electrode 132 and the second electrode 133, be also provided with conductive material chip, can be used for analog machine electric discharge.In addition, surface imperfection type solid insulation can also be provided with between the first electrode 132 and the second electrode 133, as surface is provided with solid insulation wiry etc., can be used for the discharge defect of analog detection fixed insulation.
In the present embodiment, the first electrode 132 and the second electrode 133 can be ball plate electrode group, plate plate electrode group or needle plate electrode group etc., and distance between the first electrode 132 and the second electrode 133 is adjustable, can simulate different discharge conditions.
Test cavity 130 offers air intake opening and thief hatch, and is connected with draft tube 134 and sampling pipe 135, and wherein sampling pipe 135 is provided with tensimeter 136, for showing the pressure condition in test chamber 131 in real time.SF is filled in test chamber 131 6gas.Test cavity 130 is provided with transparent windows 137.Transparent windows 137 can adopt as quartz, glass or acryl resin etc. make shaping.In addition, in test chamber 131, adsorbent 138 is also provided with, for simulating the physical device that there is adsorbent.Adsorbent 138 can be used to adsorption plant internal moisture and impurity component, ensures gas degree of purity, improves its dielectric strength.
Above-mentioned SF 6analoging detecting device 100 structure of electrical device status is simple, can be widely used in SF 6in the analog detection process of electrical device status, there is reliable results, advantage easy and simple to handle.
Below in conjunction with several concrete power station or simulation embodiment to SF of the present invention 6detection method and the analoging detecting device of electrical device status are further described.
Embodiment 1
Following table 1 lists several power station at SF in recent years 6the result of gas composition analysis during electrical equipment malfunction, as can be seen from Table 1, except widely accepted CF 4, SO 2, SOF 2, SO 2f 2deng outside mark, also has partially decomposed product, as CO 2, H 2, CS 2rise appreciably Deng also, in standing 22035 disconnecting links at Dongguan 500KV, found a large amount of CF 4, SO 2, SO 2f 2, also have the CO of 2118.1 μ L/L simultaneously 2, 100 μ L/L H 2with the CS of 24.8 μ L/L 2; A large amount of CF has been found in Shantou 220kV stands 4688 switch A phases 4, SO 2, SOF 2, meanwhile, also have the CO of 864.2 μ L/L 2.
Table 1
Note: unit: μ L/L.
As can be seen from Table 1, the SF in part power station 6electrical equipment gas concentration lwevel is abnormal, therefore, by detecting CO 2concentration, can SF be reflected 6the internal operation state of electrical equipment.
Embodiment 2
Use analoging detecting device as shown in Figure 2 to carry out simulated experiment, in solid insulation surface metal silk Discharge Simulation experiment (arrange defect on the surface of solid insulation, defect is arranged as shown in Figure 3), detect obvious CO 2, SOF 2and SO 2generation, concrete condition sees table 2.Wherein, CO 2produce when there being electric discharge at the beginning, and SOF 2and SO 2remarkable increase is started when then observing obviously intermittent electric discharge at 21 hours.As can be seen here, when device interior has the shelf depreciation relating to solid insulation to produce, SF can be produced 6feature decomposition product C O 2, SOF 2and SO 2.Significant CO can be produced when relating to the defects such as solid insulator surface damage 2, during obvious intermittent spark discharge, then produce obvious SOF 2and SO 2.
Table 2
Pressing time CO 2 SOF 2 SO 2
4h 10.1 Do not detect Do not detect
8h 108.8 Do not detect Do not detect
13h 97.2 Do not detect Do not detect
16h 102.0 Do not detect Do not detect
21h 146.3 Do not detect Do not detect
24h 76.8 3.7 0.3
Note: unit: μ L/L.
In view of a large amount of CO found in equipment after a failure 2decomposition product, illustrates CO 2in physical device defect dipoles, there is good and sensitive indicating effect.
Embodiment 3
In April, 2014, find CO in certain station 800KV wall bushing 2it is high that concentration compared with normal runs air chamber.In view of the singularity of wall bushing structure, monthly this air chamber is followed the tracks of, CO in sleeve pipe 2concentration progressively rises to the 626.0 μ L/L in Dec from the 292.7 μ L/L in April.Through reaching the tracking of 8 months, on Dec 15th, 2014, machine operation worsens, SO 2in 2 days, increase to 18.6 μ L/L from 6.9 μ L/L, and detect the SOF of 7.5 μ L/L 2, concentration sharply increases, and suspects that device interior exists shelf depreciation, suggestion power failure strip inspection, and disintegrate and find that capacitance of bushing shields zero screen place and there is electric discharge, insulating medium burns.
Concrete decomposition product situation of change sees table 3.
Table 3
Note: unit: μ L/L.
As can be seen from the above table, from April 9th, 2014 to September 23, the CO in the I wall bushing of pole 2steady-state growth, rises to 630.1 μ L/L from 292.7 μ L/L, but has no by the mark SO extensively approved 2.Along with the cracking of insulation, Dec 15, there is the SO indicating shelf depreciation 2and SOF 2, and rapid development, according to previous experiences, discharge defect can be there is in judgment device inside, suggestion power failure Disintegration overhaul.
As can be seen here, CO 2can as than SO 2deng the gas mark for judgment device defect that conventional sign gas is sensitiveer.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (10)

1.CO 2as gas mark at detection SF 6application in electrical device status.
2. a SF 6the detection method of electrical device status, is characterized in that, comprises the steps:
Collect SF 6the gas sample produced in electrical equipment;
Detect CO in described gas sample 2concentration, and according to described CO 2concentration analysis described in SF 6the state of electrical equipment.
3. SF as claimed in claim 2 6the detection method of electrical device status, is characterized in that, described according to described CO 2concentration analysis described in SF 6the state of electrical equipment described CO detected 2concentration higher than 300 μ L/L time, and along with passage of time, described CO 2concentration sustainable growth, then may there is exception in judgment device inside.
4. SF as claimed in claim 3 6the detection method of electrical device status, is characterized in that, also comprises and detects CF in described gas sample 4, SO 2, SOF 2and SO 2f 2the step of concentration, and according to described CO 2concentration coordinate CF 4, SO 2, SOF 2and SO 2f 2concentration analysis described in SF 6the state of electrical equipment, works as CF 4concentration higher than 400 μ L/L, SO 2, SOF 2and SO 2f 2start to occur, and along with passage of time, CF 4, SO 2, SOF 2and SO 2f 2concentration sustainable growth, then judge described SF 6electrical equipment is abnormal.
5. SF as claimed in claim 4 6the detection method of electrical device status, is characterized in that, the concentration detecting each gas in described gas sample uses chromatogram analysis method to detect.
6. a SF 6the analoging detecting device of electrical device status, it is characterized in that, comprise testing transformer, sleeve pipe and test cavity, described test cavity has test chamber, the first electrode and the second electrode that are oppositely arranged is provided with in described test chamber, described testing transformer is connected by described sleeve pipe with described first electrode, and described test cavity offers air intake opening and thief hatch and fills SF in described test chamber 6gas.
7. SF as claimed in claim 6 6the analoging detecting device of electrical device status, is characterized in that, is provided with conductive material chip or surface imperfection type solid insulation between described first electrode and described second electrode.
8. SF as claimed in claims 6 or 7 6the analoging detecting device of electrical device status, is characterized in that, the distance between described first electrode and described second electrode is adjustable.
9. SF as claimed in claim 6 6the analoging detecting device of electrical device status, is characterized in that, is also provided with adsorbent in described test chamber.
10. SF as claimed in claim 6 6the analoging detecting device of electrical device status, is characterized in that, described test cavity is provided with transparent windows.
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CN110554254A (en) * 2019-09-23 2019-12-10 华北电力大学 observing device for metal dust adsorption and accumulated charges of GIS or GIL equipment
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