CN109444680A - GIS metal particle extent of injury judgment method - Google Patents
GIS metal particle extent of injury judgment method Download PDFInfo
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- CN109444680A CN109444680A CN201811238801.6A CN201811238801A CN109444680A CN 109444680 A CN109444680 A CN 109444680A CN 201811238801 A CN201811238801 A CN 201811238801A CN 109444680 A CN109444680 A CN 109444680A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
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Abstract
The invention discloses a kind of GIS metal particle extent of injury judgment methods, the specific steps are that: (1) GIS ultrasonic signal and pulse current discharging signal are obtained, free metal particle is judged whether there is by consistency；(2) metal particle shape is judged by the electric discharge repetitive rate of pulse current discharging signal and electric discharge pulsewidth；(3) the n-T/2 histogram for drawing ultrasonic frequency n and corresponding half of power frequency period T/2, estimates metal particle quantity；(4) different size particles maximum carried charges and maximum Apparent discharge magnitude are emulated, the proportionality coefficient k of the two is obtainedi, emulate different size particles collision frequency pi, sample database is obtained, the k that actual measurement is obtainedmWith pmIt is compared with sample database, realizes the estimation of metal particle size；(5) judge the extent of injury of metal particle.The method achieve the estimations to metal particle motion state, shape, quantity and size, and judge the extent of injury of metal particle.
Description
Technical field
The present invention relates to Electric Power Equipment Insulation status assessment technical field, especially a kind of GIS metal particle extent of injury
Judgment method.
Background technique
Recently as the rapid development of power industry, gas insulation metal seal combined electrical apparatus (Gas Insulated
Switch-gear, abbreviation GIS) it is widely used in electric system.It is to set the transforming plant primary in addition to power transformer
Combined electrical apparatus that is standby to be closed in the metal shell filled with certain pressure SF6 gas, and being formed.With conventional open style switchgear
It compares, the advantages that connecting-disconnecting function is strong, failure rate is low, convenient for installation and maintenance, space occupied is small.
While GIS device has above-mentioned advantage, insulation fault always be influence GIS reliability an important factor for one of,
The wherein failure rate of insulation highest as caused by particle and foreign matter, affects the reliability service of equipment.Therefore, it is quite necessary to right
The metal particle extent of injury of SF6 gas insulated electric apparatus carries out assessment and early warning.
The detection of metal particle relies primarily on the measurement of shelf depreciation in GIS at present, and many scholars are for moving gold in GIS
The partial discharge phenomenon for belonging to particle is studied, and obtain it is preferable as a result, but current research focus primarily upon individually
The description of particle partial discharge phenomenon under different motion behavior, due to the motor behavior of size particles different under working voltage
Different, the shelf depreciation of generation is there is also difference, how by the motor behavior of the shelf depreciation of different type particle and particle
Certain magnitude relation is established, and realizes the estimation of metal particle shape, size, quantity by shelf depreciation, can be had to metal particle
The judgement of evil property provides important evidence.
The insulation fault as caused by particle and foreign matter is the major reason for causing combined electrical apparatus failure, to SF6 gas-insulated
The metal particle extent of injury of electrical equipment carries out assessment and early warning, is the basic need for ensureing equipment and systematic economy operation,
It is also the necessary basis for realizing GIS repair based on condition of component and equipment life cycle management economic management.And gas insulated electric apparatus metal
The particle extent of injury, which carries out assessment and early warning technology, not only academicly has important scientific research meaning, also has good
Engineering application value.
Summary of the invention
A kind of practical and reliable GIS metal particle is provided it is an object of the invention to solve above-mentioned technical problem
Extent of injury judgment method.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme:
A kind of GIS metal particle extent of injury judgment method, comprising the following steps:
1) GIS ultrasonic signal and pulse current discharging signal are obtained, it is micro- that free metal is judged whether there is by consistency
Grain；
2) metal particle shape is judged by the electric discharge repetitive rate of pulse current discharging signal and electric discharge pulsewidth；
3) ultrasonic signal in half period is counted, the n-T/2 of ultrasonic frequency n and corresponding half of power frequency period T/2 is drawn
Histogram estimates metal particle quantity；
4) different size (r are emulatedi,li) metal particle maximum carried charge QamaxiWith maximum Apparent discharge magnitude Qbmaxi, obtain
Proportionality coefficient ki=Qamaxi/Qbmaxi, emulate different size metallic particle collision frequency pi, sample database is obtained, will be surveyed
The k arrivedmWith pmIt is compared with sample database, realizes the estimation of metal particle size；
Wherein riFor the radius of i-th of metal particle, liFor the length of i-th of metal particle, kiFor i-th of metal particle
Proportionality coefficient, piFor the collision frequency of i-th of metal particle, kmFor the proportionality coefficient of m-th of metal particle, pmFor m-th of gold medal
Belong to the collision frequency of particle；
5) motion state, shape, quantity and the size of comprehensive metal particle judge the extent of injury of metal particle.
Further, free metal particle described in step 1) (metal particle freely beated), general pulse electric current
The position of the ultrasonic signal for the discharge pulse signal that detector and ultrasound measuring instrument can more sensitively detect signal, and detect
It is preferable to set consistency, and during GIS inside typical defect such as spine, creeping discharge, general pulse current detecting instrument can be cleverer
Quick detects discharge signal, and ultrasound measuring instrument is then difficult to detect ultrasonic signal.
It further, include: to calculate maximum discharge pulse cluster time span Δ in N number of power frequency period in the step 2)
Tmax, averaged discharge impulse cluster time span Δ Tave, averaged discharge pulse number Nave, maximum pd quantity Qmax, mean discharge magnitude
Qave, according to the above parameter region parting category particulate form, calculation method are as follows:
ΔTmax=MAX (Δ Ti) (1)
Qmax=MAX (qi) (4)
In formula, △ TiFor the discharge pulse cluster time span of i-th of metal particle, m is discharge pulse in N number of power frequency period
The number of cluster, k are the number of discharge pulse in N number of power frequency period, and q is discharge capacity, qiFor the discharge capacity of i-th of metal particle.
Further, in the step 3) maximum height of the n-T/2 histogram of metal particle mainly with metal particle
Number is related, and smaller, maximum ultrasound frequency n is influenced by voltage and particle sizemaxWith the relationship of the number x of metal particle are as follows:
nmax-2≤x≤nmax。
Further, the step 4) includes:
Step 41): proportionality coefficient k is establishediSample database, first to different radii riDifferent length liLinear metal particle
Maximum carried charge QamaxiSimulation calculation is carried out, and measures the maximum of different size metallic particles using general pulse current detecting instrument
Apparent discharge magnitude Qbmaxi, the different dimension combination (r of metal particlei,li) correspond to different proportionality coefficient ki；
Step 42): metal particle partial discharge test is measured using general pulse current detecting instrument and ultrasonic detector
The partial discharge quantity and ultrasonic signal of metal particle, and then obtain the maximum pd quantity of metal particle and ultrasonic arteries and veins in the unit time
Rush number；
Step 43): the estimation of metal particle size, simulation calculation difference dimension combination (ri,li) metal particle collision frequency
Rate, and collision frequency is compared with the ultrasonic pulse frequency of metal particle, obtain the ultrasound of collision frequency and metal particle
Dimension combination (the r of metal particle when pulse frequency is closer tom,lm), wherein rmFor the radius of m-th of metal particle, lmIt is
The length of m metal particle, m=1,2,3 ...；Simulation calculation difference dimension combination (rm,lm) metal particle maximum carried charge,
And multiplied by proportionality coefficient kmThe calculated value of metal particle maximum Apparent discharge magnitude is obtained, wherein kmFor the ratio of m-th of metal particle
Coefficient；The simulation result of metal particle maximum Apparent discharge magnitude is compared with measured result, obtains collision frequency and metal
One dimension combination (r, l) of the metal particle when ultrasonic pulse frequency of particle is closer to, to realize linear metal particle
The estimation of size, wherein r is the radius of metal particle, and l is the length of metal particle.
The beneficial effects of the present invention are: a kind of GIS metal particle extent of injury judgment method proposed by the present invention, establishes
Relationship between metal particle motor behavior, shelf depreciation and the extent of injury realizes metal particle shape, ruler by shelf depreciation
Very little, quantity estimation, and the extent of injury of particle is judged.
Detailed description of the invention
Fig. 1 is the flow chart of GIS metal particle extent of injury judgment method of the present invention；
Fig. 2 is the corresponding n-T/2 histogram of the linear aluminium particle of 10mm radius 0.25mm 1 long；
Fig. 3 is the corresponding n-T/2 histogram of the linear aluminium particle of 10mm radius 0.25mm 2 long；
Fig. 4 is the corresponding n-T/2 histogram of the linear aluminium particle of 10mm radius 0.25mm 8 long.
Specific embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
Referring to Fig. 1, the key step of GIS metal particle extent of injury judgment method of the invention:
(1) GIS ultrasonic signal and pulse current discharging signal are obtained, it is micro- that free metal is judged whether there is by consistency
Grain, the metal particle freely beated, the signal for the detection that general pulse current detecting instrument and ultrasound measuring instrument can be more sensitive,
And the location consistency of the ultrasonic signal of the discharge pulse signal detected is preferable；
(2) metal particle shape is judged by the electric discharge repetitive rate of pulse current discharging signal and electric discharge pulsewidth, calculated N number of
Maximum discharge pulse cluster time span Δ T in power frequency periodmax, averaged discharge impulse cluster time span Δ Tave, averaged discharge arteries and veins
Rush number Nave, maximum pd quantity Qmax, mean discharge magnitude Qave, and result is analyzed, judge metal particle shape.With phase
Linear particle (long 15mm, radius 0.25mm) and flaky particles (the long 15mm, width 2.45mm, thickness of same volume equal length
For 0.08mm), its discharge characteristic parameter under working voltage in 100 power frequency periods is counted, can determine whether out flaky particles
Discharge characteristic parameter be much larger than linear particle discharge characteristic parameter.
1 metal particle discharge characteristic parameter comparison result of table
| Discharge characteristic parameter | Flaky particles | Linear particle |
| ΔTmax | 8.51ms | 4.68ms |
| ΔTave | 6.13ms | 1.89ms |
| Nave | 151.7 | 5.17 |
| Qmax | 1560pC | 1270pC |
| Qave | 601pC | 262pC |
(3) ultrasonic signal in half period is counted, the n-T/2 of ultrasonic frequency n and corresponding half of power frequency period T/2 is drawn
Histogram estimates metal particle quantity.The maximum height of the n-T/2 histogram of metal particle mainly with the number phase of metal particle
It closes, and is influenced smaller, maximum height n by voltage and particle sizemaxWith the relationship of the number x of metal particle are as follows: nmax-2≤x≤
nmax.Fig. 2, Fig. 3, Fig. 4 are respectively 1,2, the corresponding n-T/2 histogram of the linear aluminium particle of 10mm radius 0.25mm 8 long.
(4) different size (r are emulatedi,li) metal particle maximum carried charge (Qamaxi) and maximum Apparent discharge magnitude (Qbmaxi),
Obtain ki=Qamaxi/Qbmaxi, emulate different size particles collision frequency pi, sample database is obtained, the k that actual measurement is obtainedmWith pmTogether
Sample database is compared, and realizes the estimation of metal particle size.Include:
Step (41): k is establishediSample database, first to different radii riDifferent length liThe maximum carried charge of linear particle
QamaxiSimulation calculation is carried out, and measures the maximum Apparent discharge magnitude of different size particles using general pulse current detecting instrument
Qbmaxi.Different dimension combination (the r of metal particlei,li) correspond to different proportionality coefficient ki；
Step (42): metal particle partial discharge test is surveyed using general pulse current detecting instrument and ultrasonic detector
The partial discharge quantity and ultrasonic signal of metal particle are measured, and then obtains the maximum pd quantity and ultrasound of metal particle in the unit time
Pulse number.
Step (43): the estimation of particle size, simulation calculation difference dimension combination (ri,li) metal particle collision frequency,
And collision frequency is compared with the ultrasonic pulse frequency of particle, the ultrasonic pulse frequency for obtaining collision frequency and particle relatively connects
Dimension combination (the r of particle when closem,lm) (wherein m=1,2,3 ...).Simulation calculation difference dimension combination (rm,lm) metal is micro-
The maximum carried charge of grain, and multiplied by kmObtain the calculated value of particle maximum Apparent discharge magnitude.By particle maximum Apparent discharge magnitude
Simulation result is compared with measured result, obtains the metal particle when ultrasonic pulse frequency of collision frequency and particle is closer to
A dimension combination (r, l), to realize the estimation of linear particle size.
A kind of GIS metal particle extent of injury judgment method proposed by the present invention, establishes metal particle motor behavior, office
Relationship between portion's electric discharge and the extent of injury, the estimation of metal particle shape, size, quantity is realized by shelf depreciation, and to micro-
The extent of injury of grain is judged.
In conclusion the contents of the present invention are not limited in the above embodiments, those skilled in the art can be
It is proposed other embodiments within technological guidance's thought of the invention, but these embodiments be included in the scope of the present invention it
It is interior.
Claims (5)
1. a kind of GIS metal particle extent of injury judgment method, which comprises the following steps:
1) GIS ultrasonic signal and pulse current discharging signal are obtained, free metal particle is judged whether there is by consistency；
2) metal particle shape is judged by the electric discharge repetitive rate of pulse current discharging signal and electric discharge pulsewidth；
3) ultrasonic signal in half period is counted, the n-T/2 column of ultrasonic frequency n and corresponding half of power frequency period T/2 is drawn
Figure estimates metal particle quantity；
4) different size (r are emulatedi,li) metal particle maximum carried charge QamaxiWith maximum Apparent discharge magnitude Qbmaxi, obtain ratio
Coefficient ki=Qamaxi/Qbmaxi, emulate different size metallic particle collision frequency pi, sample database is obtained, actual measurement is obtained
kmWith pmIt is compared with sample database, realizes the estimation of metal particle size；
Wherein riFor the radius of i-th of metal particle, liFor the length of i-th of metal particle, kiFor the ratio of i-th of metal particle
Example coefficient, piFor the collision frequency of i-th of metal particle, kmFor the proportionality coefficient of m-th of metal particle, pmIt is micro- for m-th of metal
The collision frequency of grain；
5) motion state, shape, quantity and the size of comprehensive metal particle judge the extent of injury of metal particle.
2. GIS metal particle extent of injury judgment method as described in claim 1, which is characterized in that free metal particle, often
The discharge pulse signal that rule pulsed amperometric detector and ultrasound measuring instrument can more sensitively detect signal, and detect surpasses
The location consistency of acoustical signal is preferable, and during GIS inside typical defect such as spine, creeping discharge, the inspection of general pulse electric current
Discharge signal can more sensitively be detected by surveying instrument, and ultrasound measuring instrument is then difficult to detect ultrasonic signal.
3. GIS metal particle extent of injury judgment method as described in claim 1, which is characterized in that packet in the step 2)
It includes: calculating maximum discharge pulse cluster time span Δ T in N number of power frequency periodmax, averaged discharge impulse cluster time span Δ Tave、
Averaged discharge pulse number Nave, maximum pd quantity Qmax, mean discharge magnitude Qave, according to the above parameter region parting category particulate form,
Calculation method are as follows:
ΔTmax=MAX (Δ Ti) (1)
Qmax=MAX (qi) (4)
In formula, △ TiFor the discharge pulse cluster time span of i-th of metal particle, m is discharge pulse cluster in N number of power frequency period
Number, k are the number of discharge pulse in N number of power frequency period, and q is discharge capacity, qiFor the discharge capacity of i-th of metal particle.
4. GIS metal particle extent of injury judgment method as described in claim 1, which is characterized in that golden in the step 3)
The maximum height for belonging to the n-T/2 histogram of particle is mainly related to the number of metal particle, and is influenced by voltage and particle size
It is smaller, maximum ultrasound frequency nmaxWith the relationship of the number x of metal particle are as follows: nmax-2≤x≤nmax。
5. GIS metal particle extent of injury judgment method as described in claim 1, which is characterized in that the step 4) includes:
Step 41): proportionality coefficient k is establishediSample database, first to different radii riDifferent length liThe maximum of linear metal particle
Carried charge QamaxiSimulation calculation is carried out, and is existed using the maximum view that general pulse current detecting instrument measures different size metallic particles
Discharge capacity Qbmaxi, the different dimension combination (r of metal particlei,li) correspond to different proportionality coefficient ki；
Step 42): metal particle partial discharge test measures metal using general pulse current detecting instrument and ultrasonic detector
The partial discharge quantity and ultrasonic signal of particle, and then obtain the maximum pd quantity of metal particle and ultrasonic pulse in the unit time
Number；
Step 43): the estimation of metal particle size, simulation calculation difference dimension combination (ri,li) metal particle collision frequency,
And collision frequency is compared with the ultrasonic pulse frequency of metal particle, obtain the ultrasonic pulse of collision frequency and metal particle
Dimension combination (the r of metal particle when frequency is closer tom,lm), wherein rmFor the radius of m-th of metal particle, lmIt is m-th
The length of metal particle, m=1,2,3 ...；Simulation calculation difference dimension combination (rm,lm) metal particle maximum carried charge, and multiply
With proportionality coefficient kmThe calculated value of metal particle maximum Apparent discharge magnitude is obtained, wherein kmFor the ratio system of m-th of metal particle
Number；The simulation result of metal particle maximum Apparent discharge magnitude is compared with measured result, it is micro- with metal to obtain collision frequency
One dimension combination (r, l) of the metal particle when ultrasonic pulse frequency of grain is closer to, to realize linear metal particle ruler
Very little estimation, wherein r is the radius of metal particle, and l is the length of metal particle.
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| CN110672619A (en) * | 2019-09-30 | 2020-01-10 | 广州供电局有限公司 | GIS running-in product comparison block, comparison device and application of comparison device |
| CN112578245A (en) * | 2020-12-09 | 2021-03-30 | 广西电网有限责任公司电力科学研究院 | GIS disconnecting link air chamber fault diagnosis method and device based on optical technology |
| CN112881871A (en) * | 2021-01-13 | 2021-06-01 | 国网宁夏电力有限公司电力科学研究院 | Detection method and detection system for metal particles in GIS equipment |
| CN113189454A (en) * | 2021-04-02 | 2021-07-30 | 西安交通大学 | GIS metal particle identification method based on ultrasonic signal collision frequency normalization |
| CN113848442A (en) * | 2021-10-22 | 2021-12-28 | 云南电网有限责任公司电力科学研究院 | Method and device for identifying particle size defects in gas insulation environment |
| CN114441910A (en) * | 2022-01-28 | 2022-05-06 | 上海格鲁布科技有限公司 | High-precision anti-interference partial discharge live detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113189454A (en) * | 2021-04-02 | 2021-07-30 | 西安交通大学 | GIS metal particle identification method based on ultrasonic signal collision frequency normalization |
| CN113189454B (en) * | 2021-04-02 | 2022-10-28 | 西安交通大学 | GIS metal particle identification method based on ultrasonic signal collision frequency normalization |
| CN113848442A (en) * | 2021-10-22 | 2021-12-28 | 云南电网有限责任公司电力科学研究院 | Method and device for identifying particle size defects in gas insulation environment |
| CN114441910A (en) * | 2022-01-28 | 2022-05-06 | 上海格鲁布科技有限公司 | High-precision anti-interference partial discharge live detection device |
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