CN104749506B - Method for calculating running electrical equipment partial discharge quantity through SF6 decomposition product content - Google Patents
Method for calculating running electrical equipment partial discharge quantity through SF6 decomposition product content Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000000354 decomposition reaction Methods 0.000 title abstract description 17
- 239000007789 gas Substances 0.000 claims description 45
- 238000001514 detection method Methods 0.000 claims description 27
- 238000002474 experimental method Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 9
- OBTWBSRJZRCYQV-UHFFFAOYSA-N sulfuryl difluoride Chemical compound FS(F)(=O)=O OBTWBSRJZRCYQV-UHFFFAOYSA-N 0.000 claims description 9
- DUGWRBKBGKTKOX-UHFFFAOYSA-N tetrafluoro(oxo)-$l^{6}-sulfane Chemical compound FS(F)(F)(F)=O DUGWRBKBGKTKOX-UHFFFAOYSA-N 0.000 claims description 9
- LSJNBGSOIVSBBR-UHFFFAOYSA-N thionyl fluoride Chemical compound FS(F)=O LSJNBGSOIVSBBR-UHFFFAOYSA-N 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000004587 chromatography analysis Methods 0.000 claims 1
- 229910018503 SF6 Inorganic materials 0.000 abstract description 26
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 abstract description 10
- 229960000909 sulfur hexafluoride Drugs 0.000 abstract description 4
- 238000011156 evaluation Methods 0.000 abstract 1
- 238000004088 simulation Methods 0.000 description 14
- 230000007547 defect Effects 0.000 description 10
- 238000012360 testing method Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011981 development test Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003909 pattern recognition Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention provides a method for calculating running electric equipment partial discharge quantity through SF6 decomposition product content. The method includes: S1, recording the content of decomposition products at the time of a; S2, recording the content of the decomposition products at the time of b; S3, recording total degree Nt of partial discharge occurring in the time of t; S4, calculating average discharge quantity Q of the partial discharge, occurring in the time of t, of equipment. Partial discharge level in the equipment is calculated through SF6 gas decomposition product content, the problem that the partial discharge quantity in the equipment cannot be quantitatively detected when the partial discharge occurs under the running condition of existing sulfur hexafluoride gas-insulated equipment is solved, and very important data support can be provided for the running state or fault degree evaluation of the sulfur hexafluoride gas-insulated equipment.
Description
Technical field
SF in running is calculated the invention belongs to one kind6The method of partial discharge quantity size in gas insulated electric apparatus, it is special
It is not related to utilize SF in equipment during live live detection6Catabolite content calculates the partial discharge quantity in operation electrical equipment.
Background technology
Equipment Common Electrical Apparatus feature is most with shelf depreciation effect, and occurrence cause is various by its internal presence
Defect triggers the electric field distortion of device interior, causes some position Electric Field Distributions uneven, causes shelf depreciation to produce.Shelf depreciation
It is the main cause for causing insulation degradation, conventional equipment fault diagnosis method is mainly to device interior shelf depreciation mistake at present
Cheng Jinhang detections and monitoring, can be found that and determine the presence of equipment component built-in electrical insulation defect in general, right
Ensure that the safe and reliable operation of power network has important practical significance.
Common detection method of partial discharge of electrical equipment has：Pulse current method, high-frequency method (hyperfrequency method) and ultrasonic wave
Method.Pulse current method application time is more long, there is international standard IEC 60270：2000 and standard GB/T/T 7354-2003 are advised
Model its measure loop, scaling method and test procedure etc., it is possible to obtain apparent partial discharge quantity, but anti-interference is poor,
Signal to noise ratio is low, but cannot realize running the live detection of electrical equipment.Live operational outfit Partial Discharge Detection can be used at present
Method be high-frequency method (hyperfrequency method) and supercritical ultrasonics technology.The high-frequency electrical that high-frequency method (hyperfrequency method) is given off using shelf depreciation
Magnetostatic wave signal is detected that be effectively shielded from live common electromagnetic interference, sensitivity is high, and antijamming capability is stronger, and can
On-line monitoring, pattern-recognition and fault location are realized, but partial discharge quantity is difficult to demarcate.Supercritical ultrasonics technology is produced using shelf depreciation
Raw vibration signal is detected that sensor is contacted with the electric loop of Devices to test without any, and anti-electromagnetic interference capability is stronger,
And the fault location of shelf depreciation can be realized, but there is also partial discharge quantity and be difficult to demarcate, signal to noise ratio is low, and anti-interference is poor
It is not enough.
In SF6Gas used as in the electrical equipment of dielectric, send out during shelf depreciation can also cause operational outfit by SF6 gases
Solution estranged, with moisture micro in equipment and oxygen generation H2S、SO2、SOF2、SO2F2Deng some low-fluorine sulfides.By chemistry
Detection means detects these catabolites, can be as the supplementary means of live Partial Discharge Detection.At present both at home and abroad to electric
SF in equipment6Corresponding relation does not do related further investigation also between catabolite and shelf depreciation state, only exists experienced
Judge.Particularly SF in electrical equipment6The composition and content of catabolite are how much between partial discharge quantity size in the equipment
There is no clear and definite corresponding relation.There is no any standard or research to show, SF6A certain or several catabolites in catabolite
Appearance, and how much correspondences of catabolite content certain specific energy shelf depreciation.
The method that applicant is calculated using chemical theory, according to Hubei Province SF6The practical operation situation of electrical equipment, sets up
SF under different condition6Gas produces the Chemical Reaction Model of catabolite and is simulated calculating, under the conditions of research differential responses
Various SF6The size of the possibility of gas decomposition product generation and reaction energy needed for generation different decomposition product.Meanwhile, application
People also designs and has manufactured a set of for SF6The GIS partial discharge analogue experiment installation of gas decomposition product research, using device
The shelf depreciation of energy Simulated GlS inside typical defect generation simultaneously detects discharge voltage and discharge capacity, is examined using chromatogram, infrared technique
Survey SF caused by shelf depreciation6Gas decomposition product, by data correlation and conversed analysis, it is proposed that one kind utilizes SF6Decompose and produce
The method that thing content calculates operation electrical equipment partial discharge amount, cannot measure local in electrical equipment for solving live live detection
The deficiency of discharge capacity.
The content of the invention
The present invention provides a kind of SF according to the deficiencies in the prior art6Catabolite content calculates that operation electrical equipment is locally put
The method of electricity, solving live live detection cannot measure the deficiency of partial discharge quantity in electrical equipment.
Technical scheme：A kind of SF6The method that catabolite content calculates operation local discharge of electrical equipment amount,
It is characterised in that it includes following steps：
S1, using chemical detection means, to the SF that shelf depreciation occurs6Gas insulated electric apparatus carry out gas componant inspection
Survey, record content X of each catabolite at a momentiaAnd Xja, i is catabolite SOF4、SOF2、SO2F2、SO2、S2F10, j is point
Solution product H2S；
S2, by after at least 1 hour, the SF to there is shelf depreciation again6Gas insulated electric apparatus composition of gases within
Detected, recorded content X of each catabolite at the b momentibAnd Xjb；
S3, using high frequency partial discharge detection instrument, ultrahigh frequency partial discharge detector or ultrasonic partial discharge detector to there is local putting
The SF of electricity6The number of times that shelf depreciation occurs in gas insulated electric apparatus is monitored, and records time t (t=tb–ta) interior generation
The total degree N of shelf depreciationt；
There is the SF of shelf depreciation in S4, record6The working voltage U of gas insulated electric apparatus, it is absolute in equipment air chamber
, there is the mean discharge magnitude Q of shelf depreciation within the t time periods using equation below computing device in pressure p：
Wherein, EipIt is catabolite SOF4、SOF2、SO2F2、SO2、S2F10Theoretical molar generation energy under p pressure；
EjpIt is catabolite H2S existspTheoretical molar generation energy under pressure；F is shelf depreciation electric energy conversion ratio.
The E being calculated by chemistry calculation software GaussianipValue be 488.6kJ/mol (p=3atm)~
693.0kJ/mol (p=6atm), EjpValue is 1124.4kJ/mol (p=3atm)~1529.2kJ/mol (p=6atm).
The shelf depreciation electric energy conversion ratio f is determined by GIS partial discharge analogue experiment installation.
The beneficial effects of the present invention are：The present invention realize by SF6 gas decomposition product contents come estimation apparatus
Interior local discharging level, when solving current sulfur hexafluoride gas insulation equipment shelf depreciation occurring under running conditions, it is impossible to
The problem of partial discharge quantity in quantitative determination equipment, can be the running status or fault degree of sulfur hexafluoride gas insulation equipment
Evaluate and very important data support is provided.
Brief description of the drawings
Fig. 1 is overall flow figure of the invention；
Fig. 2 to Fig. 5 is the SOF for simulating partial discharge experiment 1 to simulation partial discharge experiment 42Concentration changes with time figure.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings：
The present invention proposes a kind of SF6Catabolite content calculates the method for operation local discharge of electrical equipment amount, its feature
It is to comprise the following steps：
S1, using chemical detection means, to the SF that shelf depreciation occurs6Gas insulated electric apparatus carry out gas componant inspection
Survey, record content X of each catabolite at a momentiaAnd Xja, i is catabolite SOF4、SOF2、SO2F2、SO2、S2F10, j is point
Solution product H2S；
S2, by after at least 1 hour, the SF to there is shelf depreciation again6Gas insulated electric apparatus composition of gases within
Detected, recorded content X of each catabolite at the b momentibAnd Xjb；
S3, using high frequency partial discharge detection instrument, ultrahigh frequency partial discharge detector or ultrasonic partial discharge detector to there is local putting
The SF of electricity6The number of times that shelf depreciation occurs in gas insulated electric apparatus is monitored, and records time t (t=tb–ta) interior generation
The total degree N of shelf depreciationt；
There is the SF of shelf depreciation in S4, record6The working voltage U of gas insulated electric apparatus, it is absolute in equipment air chamber
, there is the mean discharge magnitude Q of shelf depreciation within the t time periods using equation below computing device in pressure p：
Wherein, EipIt is catabolite SOF4、SOF2、SO2F2、SO2、S2F10Theoretical molar generation energy under p pressure；
EjpIt is catabolite H2S existspTheoretical molar generation energy under pressure；F is shelf depreciation electric energy conversion ratio.
Before method is implemented, first have to determine parameter E in computing formulaip、Ejp, f concrete numerical values, step is as follows：
1st, SF is studied using chemistry calculation software Gaussian6The response path of the chemical reaction of decomposition, by based on point
The theoretical molar being calculated by needed for generating feature decomposition product of sub- thermodynamics stable state generates ENERGY Eip、Ejp, major experimental knot
By as follows：
At 20 DEG C, under the absolute pressure of 3atm~6atm, SOF4、SOF2、SO2F2、SO2、S2F10As long as these products SF6
It is decomposed into SF4Afterwards, in H2O and O2In the presence of under conditions of, it is possible to be spontaneously generated.The growing amount of all catabolites containing S elements
With reactant SF4Consumption be one-to-one relation, that is, generate 1mol specific catabolite (SOF4、SOF2、SO2F2、
SO2、S2F10) SF that is consumed4Be similarly 1mol, then least energy required for generation 1mol these specific catabolites with
Generate the SF of 1mol4Required energy is identical in theory, is 488.6kJ/mol (p=3atm)~693.0kJ/mol
(p=6atm), so EipValue is 488.6kJ/mol (p=3atm)~693.0kJ/mol (p=6atm).
At 20 DEG C, under the absolute pressure of 3atm~6atm, H is generated2This catabolites of S are, it is necessary to energy higher.Will
Make H2This catabolites of S can be generated, i.e., at least need to provide 1124.4kJ/mol (p=3atm)~1529.2kJ/ to system
The energy of mol (p=6atm), so EjpValue is 1124.4kJ/mol (p=3atm)~1529.2kJ/mol (p=6atm).
2nd, by homemade a set of for SF6The partial discharge simulation experiment device of gas decomposition product research, simulation electricity
The shelf depreciation of gas device interior typical defect generation simultaneously passes through pulse current partial discharge detection instrument quantitative determination discharge voltage and puts
Electricity；By detecting SF caused by shelf depreciation6Gas decomposition product, determines the transformation in planta rate f of shelf depreciation electric energy, mainly
Experiment conclusion is as follows：
For exciting SF6The GIS partial discharge analogue experiment installation of gas decomposition run is main by high-voltage test electric power, liter
Plenum chamber, coupled capacitor air chamber, SF6Electric discharge air chamber (volume 60L), manual simulation's defect, discharge pulse signal monitoring system etc.
Composition, the insulation defect in device electric discharge air chamber has selected point discharge model as the Defect Modes for producing local discharge signal
Type.SF is carried out on the test platform developed6Shelf depreciation gas decomposition components development test process is as follows：First, by experiment
Principle main wiring diagram connecting components；Secondly, manual simulation's defect is installed, the SF that pressure is 0.30~0.6MPa is re-filled with6Gas
Body；Then, applying enough voltage makes simulated defect produce shelf depreciation, and local putting is recorded by pulse current partial discharge detection instrument
The discharge voltage and partial discharge quantity of electricity, and gather gas sample injection gas-chromatography, infrared detection system and carry out gas sample
Component analysis.Specific test procedure：
1. discharge voltage and discharge capacity are measured
The manual simulation's defect model for needing detection is inserted, by gas sampling valve toward pressure needed for injection in electric discharge air chamber
SF6Gas, adjusts pressure regulator console, slowly raises experimental voltage, examines the ripple on high-speed figure storage oscillograph
Shape, when there is discharge pulse, slow regulation Regulation Control platform makes partial discharge amount stablize relatively, using software records with hour as single
Position records interior partial discharge number of times and the corresponding partial discharge amount of each partial discharge per hour.
2. catabolite content is measured
A gas sample collection is carried out within 1 hour in every electric discharge, gas-chromatography and infrared detection system are injected immediately after
Carry out gas sample component analysis.SOF is detected by infrared detection system2、SO2And H2S contents, chromatographic system detection (SOF4+
SO2F2) whole content.
Using GIS partial discharge analogue experiment installations, we simulate 4 groups of partial discharge experiments.
Simulation partial discharge experiment 1
Experimental condition：Needle plate is apart from 1cm, discharge voltage 55kV, electric discharge air chamber pressure 0.4MPa, SF6Content 99.9%,
AIR contents 0.1%, the μ L/L of moisture 150.
Catabolite content, such as following table in an air chamber are detected every 1 hour：
Linear fit is carried out by curve, relational expression is obtained：
Y=0.03096x-0.00734
Wherein Y is SOF2Content, x is discharge time, and the slope of a curve is 0.03096, represents SOF per hour2Content
Can increase by 0.03096 μ L/L.So, the SOF of 0.03096 μ L/L is increased per hour2Required minimum chemical energy=
0.03096×10-6×60L×4÷22.4L/mol×691×103J/mol=0.229215J.
Every partial discharge parameter hourly see the table below：
| Discharge time | Electric discharge total amount pC | Mean discharge magnitude pC | Electric energy J | |
| 1h | 518221 | 8038697.2 | 15.51210239 | 0.442128347 |
| 2h | 525695 | 9230081.8 | 17.55786487 | 0.507654497 |
| 3h | 409364 | 7250346.8 | 17.71124677 | 0.398769075 |
| 4h | 603389 | 10865856 | 18.00804479 | 0.597622088 |
| 5h | 1029589 | 18798714 | 18.25846409 | 1.033929258 |
| 6h | 1553577 | 31590859 | 20.3342734 | 1.73749727 |
| 7h | 1475974 | 30474207 | 20.64684514 | 1.676081364 |
| 8h | 1534500 | 34569730 | 22.52833508 | 1.90133516 |
| Average value | 890576 | 18852311.5 | 21.16865447 | 1.0369 |
According to the discharge capacity and discharge time of record, it may be seen that being after mean discharge magnitude hourly conversion
1.0369J, then in this simulation partial discharge test, the transformation in planta rate f=0.229215 ÷ of shelf depreciation electric energy
1.0396=22.05%.
Simulation partial discharge experiment 2
Experimental condition：Needle plate is apart from 1cm, discharge voltage 55kV, electric discharge air chamber pressure 0.4MPa, SF6Content 99.9%,
AIR contents 0.1%, the μ L/L of moisture 1000.
Catabolite content, such as following table in an air chamber are detected every 1 hour：
Linear fit is carried out by curve, relational expression is obtained：
Y=0.03442x+0.00905
Wherein Y is SOF2Content, x is discharge time, and the slope of a curve is 0.03442, represents SOF per hour2Content
Can increase by 0.03442 μ L/L.So, the SOF of 0.03442 μ L/L is increased per hour2Required minimum chemical energy=0.03442
×10-6×60L×4÷22.4L/mol×691×103J/mol=0.254831J.
Every partial discharge parameter hourly see the table below：
| Discharge time | Electric discharge total amount pC | Mean discharge magnitude pC | Electric energy J | |
| 1h | 519549 | 12382151.37033200 | 23.8325 | 0.681018 |
| 2h | 344344 | 7458427.59310398 | 21.65982 | 0.410214 |
| 3h | 344232 | 7751704.47089803 | 22.51884 | 0.426344 |
| 4h | 463880 | 10770026.87769100 | 23.21727 | 0.592351 |
| 5h | 497371 | 11053803.95468990 | 22.22446 | 0.607959 |
| 6h | 430820 | 9165236.32414198 | 21.27393 | 0.504088 |
| 7h | 447992 | 10299426.15355000 | 22.9902 | 0.566468 |
| 8h | 455045 | 10286244.07289400 | 22.60489 | 0.565743 |
| 9h | 512781 | 11583446.71570910 | 22.58946 | 0.63709 |
| Average value | 446223 | 10083385.281 | 22.59715 | 0.5546 |
According to the discharge capacity and discharge time of record, it may be seen that being after mean discharge magnitude hourly conversion
0.5546J, then in this simulation partial discharge test, the transformation in planta rate f=0.254831 ÷ of shelf depreciation electric energy
0.5546=45.95%.
Simulation partial discharge experiment 3
Experimental condition：Needle plate is apart from 1cm, discharge voltage 55kV, electric discharge air chamber pressure 0.4MPa, SF6Content 97.0%,
AIR contents 3.0%, the μ L/L of moisture 150.
Catabolite content, such as following table in an air chamber are detected every 1 hour：
Linear fit is carried out by curve, relational expression is obtained：
Y=0.02752x-0.00324
Wherein Y is SOF2Content, x is discharge time, and the slope of a curve is 0.03442, represents SOF per hour2Content
Can increase by 0.02752 μ L/L.So, the SOF of 0.02752 μ L/L is increased per hour2Required minimum chemical energy=0.02752
×10-6×60L×4÷22.4L/mol×691×103J/mol=0.203746J.
Every partial discharge parameter hourly see the table below：
| Discharge time | Electric discharge total amount pC | Mean discharge magnitude pC | Electric energy J | |
| 1h | 839179 | 18670924.31385490 | 22.24904 | 1.026901 |
| 2h | 887341 | 19787040.49549000 | 22.29925 | 1.088287 |
| 3h | 501004 | 11368000.33135200 | 22.69044 | 0.62524 |
| 4h | 699817 | 16033134.81209980 | 22.91047 | 0.881822 |
| 5h | 449871 | 10392081.77929990 | 23.10014 | 0.571564 |
| 6h | 538480 | 11099239.39595300 | 20.61217 | 0.610458 |
| 7h | 431814 | 9808070.65712290 | 22.71365 | 0.539444 |
| 8h | 395186 | 9175575.72580798 | 23.21837 | 0.504657 |
| 9h | 556925 | 12498623.00679700 | 22.4422 | 0.687424 |
| Average value | 588846 | 13203632 | 22.42288 | 0.7262 |
According to the discharge capacity and discharge time of record, it may be seen that being after mean discharge magnitude hourly conversion
0.7262J, then in this simulation partial discharge test, the transformation in planta rate f=0.203746 ÷ of shelf depreciation electric energy
0.7262=28.06%.
Simulation partial discharge experiment 4
Experimental condition：Needle plate is apart from 2cm, discharge voltage 85kV, electric discharge air chamber pressure 0.4MPa, SF6Content 99.9%,
AIR contents 0.1%, the μ L/L of moisture 150.
Catabolite content, such as following table in an air chamber are detected every 1 hour：
Linear fit is carried out by curve, relational expression is obtained：
Y=0.06615x+0.00519
Wherein Y is SOF2Content, x is discharge time, and the slope of a curve is 0.06615, represents SOF per hour2Content
Can increase by 0.06615 μ L/L.So, the SOF of 0.06615 μ L/L is increased per hour2Required minimum chemical energy=0.06615
×10-6×60L×4÷22.4L/mol×691×103J/mol=0.489746J.
Every partial discharge parameter hourly see the table below：
| Discharge time | Electric discharge total amount pC | Mean discharge magnitude pC | Electric energy J | |
| 1h | 1050827 | 22673265.72664300 | 21.57659227 | 1.927228 |
| 2h | 671121 | 14597434.69594610 | 21.75082391 | 1.240782 |
| 3h | 928720 | 21097299.58720600 | 22.71653414 | 1.79327 |
| 4h | 946592 | 20967745.52835600 | 22.15077407 | 1.782258 |
| Average value | 899315 | 19833936 | 22.0486811 | 1.68588459 |
According to the discharge capacity and discharge time of record, it may be seen that being after mean discharge magnitude hourly conversion
1.68588J, then in this simulation partial discharge test, the transformation in planta rate f=0.489746 ÷ of shelf depreciation electric energy
1.68588=29.05%.
In summary experiment conclusion, determines that the transformation in planta rate f of shelf depreciation electric energy is 30% or so.
Embodiment 1：
The 220kV voltage class GIS main gas tank of certain suspected malfunctions, air chamber absolute pressure 6MPa, chamber volume 100L, partial discharge
Live detection obtains per hour that mean discharge number is about by ultrahigh frequency partial discharge detector continuous monitoring to there is continuous Partial discharge signal
It is 2 × 109Secondary, the detection of SF6 gas decomposition products only detects SOF2And SO2, SOF is obtained by continuous monitoring2And SO2Per hour
Increment is each about 0.1 μ L/L, and water content detection is not exceeded.
According to formula：
It is not detected by H2S, (Xjb–Xja) it is 0；
SOF2And SO2Increment is each about 0.1 μ L/L per hour, shows ∑ (Xib–Xia)=(SOF2Increment+SO per hour2Often
Hour increment) × gas indoor gas volume ÷ 22.4L/mol at ambient pressure gas constant=0.2 μ L/Lh × 100L × 5
÷ 22.4L/mol=4.464 × 10-3mol/h；
Under absolute pressure 6atm, EipIt is 693.0kJ/mol,
Equipment operating pressure U is 220kV, and ultrahigh frequency partial discharge detector continuous monitoring obtains mean discharge number N per hourt
About 2 × 109It is secondary；
Conversion ratio according to f=30% is calculated, Q=23.415pC.
Claims (4)
1. a kind of SF6The method that catabolite content calculates operation local discharge of electrical equipment amount, it is characterised in that including following
Step：
S1, using chemical detection means, to the SF that shelf depreciation occurs6Gas insulated electric apparatus carry out gas componant detection, note
Record content X of each catabolite at a momentiaAnd Xja, i is catabolite SOF4、SOF2、SO2F2、SO2、S2F10, j is to decompose to produce
Thing H2S；
S2, by after at least 1 hour, the SF to there is shelf depreciation again6Gas insulated electric apparatus composition of gases within is examined
Survey, record content X of each catabolite at the b momentibAnd Xjb；
S3, using high frequency partial discharge detection instrument, ultrahigh frequency partial discharge detector or ultrasonic partial discharge detector to there is shelf depreciation
SF6The number of times that shelf depreciation occurs in gas insulated electric apparatus is monitored, and occurs in record time t total time of shelf depreciation
Number Nt, t=tb–ta；
There is the SF of shelf depreciation in S4, record6The working voltage U of gas insulated electric apparatus, the absolute pressure p in equipment air chamber,
There is the mean discharge magnitude Q of shelf depreciation within the t time periods using equation below computing device：
Wherein, EipIt is catabolite SOF4、SOF2、SO2F2、SO2、S2F10Theoretical molar generation energy under p pressure；EjpFor
Catabolite H2Theoretical molar generation energy of the S under p pressure；F is shelf depreciation electric energy conversion ratio.
2. a kind of SF according to claim 16The method that catabolite content calculates operation local discharge of electrical equipment amount,
It is characterized in that：By chemistry calculation software Gaussian be calculated as p=3atm~p=6atm, EipValue is
488.6kJ/mol~693.0kJ/mol, EjpValue is 1124.4kJ/mol~1529.2kJ/mol.
3. a kind of SF according to claim 16The method that catabolite content calculates operation local discharge of electrical equipment amount,
It is characterized in that：The shelf depreciation electric energy conversion ratio f is determined by GIS partial discharge analogue experiment installation.
4. a kind of SF according to claim 16The method that catabolite content calculates operation local discharge of electrical equipment amount,
It is characterized in that：Chemical detection means in the step S1 include chromatography, infra-red sepectrometry, electrochemical sensor method.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510158356.2A CN104749506B (en) | 2015-04-03 | 2015-04-03 | Method for calculating running electrical equipment partial discharge quantity through SF6 decomposition product content |
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| CN201510158356.2A CN104749506B (en) | 2015-04-03 | 2015-04-03 | Method for calculating running electrical equipment partial discharge quantity through SF6 decomposition product content |
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| CN105572159B (en) * | 2015-12-24 | 2018-06-01 | 莆田学院 | One kind is based on SF under molecular dynamics and shelf depreciation6Decomposition analysis method |
| CN105676085B (en) * | 2016-01-31 | 2018-12-04 | 国家电网公司 | Based on extra-high voltage GIS detection method for local discharge combined of multi-sensor information |
| CN106680674B (en) * | 2016-11-29 | 2020-06-12 | 国网重庆市电力公司电力科学研究院 | Cable joint insulation state assessment method |
| CN107255777A (en) * | 2017-05-31 | 2017-10-17 | 武汉大学 | A kind of SF for being used to characterize air insulating device shelf depreciation energy6Decomposition components characteristic quantity |
| CN109298293B (en) * | 2018-09-18 | 2019-12-24 | 西安理工大学 | Gas decomposition characteristic quantity for representing arc extinguishing and insulating capability of novel power equipment |
| CN111123044A (en) * | 2019-11-25 | 2020-05-08 | 国网江西省电力有限公司电力科学研究院 | SF (sulfur hexafluoride)6Method and device for judging GIS release amount by concentration of acidic decomposition product |
| CN111678982B (en) * | 2020-06-24 | 2022-03-29 | 广东电网有限责任公司电力科学研究院 | Experimental method and device for detecting gas-solid insulation compatibility of substitute gas |
| CN111916157A (en) * | 2020-08-07 | 2020-11-10 | 国网重庆市电力公司电力科学研究院 | SF6 spark discharge decomposition impurity analysis method and device |
| CN112763875A (en) * | 2020-12-30 | 2021-05-07 | 广东电网有限责任公司电力科学研究院 | Method and system for monitoring local discharge amount in gas insulated switchgear |
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| CN101059485B (en) * | 2007-05-23 | 2010-07-21 | 重庆大学 | Sulfur hexafluoride discharge decomposed gas component analysis system and its usage method |
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