CN106814290A - A kind of 10kV switch cabinet states detection method - Google Patents
A kind of 10kV switch cabinet states detection method Download PDFInfo
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- CN106814290A CN106814290A CN201510875752.7A CN201510875752A CN106814290A CN 106814290 A CN106814290 A CN 106814290A CN 201510875752 A CN201510875752 A CN 201510875752A CN 106814290 A CN106814290 A CN 106814290A
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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
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Abstract
The present invention provides a kind of 10kV switch cabinet states detection method, sets up 10kV switch cubicle test platforms；Obtain defect statistics collection of illustrative plates and state criterion comparison library；Measure the transient state ground electric wave amplitude of partial discharge of switchgear；And judge transient state ground electric wave amplitude whether higher than ambient noise；Contrast switch cubicle counts the defect statistics collection of illustrative plates in collection of illustrative plates and state criterion comparison library and calculates the degree of correlation, obtains and compare the end value of tested switch cubicle statistics collection of illustrative plates and whole defect statistics collection of illustrative plates, and the collection of illustrative plates of setting value maximum is result of determination；Assess current 10kV switch cabinet states.Method proposed by the present invention, it is to avoid the weak point of state criterion method in the switch cabinet state assessment that tradition is set up according to threshold method, can accurately, efficiently and reliably reflect the time of day of switch cubicle；The operation stability and security of 10kV switch cubicles are improve, and then ensure that the safety in operation and stability of power distribution network.
Description
Technical field
The present invention relates to the measurement testing field of controller switching equipment, and in particular to a kind of 10kV switch cabinet states detection method.
Background technology
Switch cubicle is the visual plant in power distribution network, its state is correctly assessed, and taken in time according to assessment result
Countermeasure is the effective means for ensureing power distribution network safe and stable operation.Find to open by measuring transient state ground potential (TEV)
It is the method generally used during current switch cabinet is detected to close cabinet inside shelf depreciation, and the amplitude of transient state ground potential is assessment switch
The important evidence of cabinet state.
At present, in switch cabinet state assessment, the criterion of switch cabinet state uses the threshold method based on experience, when
When transient state ground potential measurement amplitude is less than 20dB, switch cabinet state is judged to normally；Transient state ground potential measurement amplitude is more than
During equal to 20dB, switch cabinet state is judged to defect.This decision method belongs to very coarse decision method, it is impossible to
Reflect the time of day of switch cubicle.Shelf depreciation is closely related to the extent of injury of switch cubicle and the type of shelf depreciation.Open
Closing shelf depreciation in cabinet can be divided into suspended discharge, creeping discharge, spine electric discharge, insulating part internal discharge from mechanism
4 kinds.The harm of wherein creeping discharge is maximum, may cause punch through at any time；The harm of suspended discharge and creeping discharge is minimum,
Inside switch cabinet can be for a long time present in, without causing accident.If judging there is 19dB width using traditional threshold method
The switch cabinet state of value creeping discharge can be judged as normally, and there is the switch cabinet state meeting of 21dB amplitude suspended discharges
It is judged as defect.This criterion obviously can not accurately reflect switch cabinet state, therefore, set up a kind of based on local
The switch cabinet state criterion of discharge defect type identification is urgently carried out.
The content of the invention
In view of this, a kind of 10kV switch cabinet states detection method that the present invention is provided, it is to avoid tradition is according to threshold method
The weak point of state criterion method, can accurately, efficiently and reliably reflect in the switch cabinet state assessment of foundation
The time of day of switch cubicle；The operation stability and security of 10kV switch cubicles are improve, and then ensure that power distribution network
Safety in operation and stability.
The purpose of the present invention is achieved through the following technical solutions：
A kind of 10kV switch cabinet states detection method, methods described comprises the following steps：
Step 1. sets up the 10kV switch cubicle test platforms for including typical shelf depreciation defect model；
Step 2. is measured and counts the transient state ground potential signal of local discharge defect, obtains defect statistics collection of illustrative plates；
Step 3. counts the defect statistics collection of illustrative plates of various shelf depreciation defect types, obtains state criterion comparison
Storehouse；
The transient state ground electric wave amplitude of the tested 10kV partial discharge of switchgear of step 4. measurement；And judge transient state ground electric wave
Whether amplitude is higher than ambient noise；
If so, then counting transient state ground electric wave amplitude, tested 10kV switch cubicles statistics collection of illustrative plates is obtained；Into step 5；
If it is not, then judging that the tested 10kV switch cubicles are in normal condition, detection terminates；
Step 5. is by the defect in the tested 10kV switch cubicles statistics collection of illustrative plates and the state criterion comparison library
Statistics collection of illustrative plates is contrasted and is calculated the degree of correlation one by one, takes the average value of the degree of correlation as the final of every kind of defect statistics collection of illustrative plates
Value；
Step 6. compares the end value of the tested 10kV switch cubicles statistics collection of illustrative plates and the defect statistics collection of illustrative plates of whole, setting
It is result of determination to be worth maximum collection of illustrative plates；
Step 7. assesses the current 10kV switch cabinet states according to result of determination.
Preferably, the described typical shelf depreciation defect model in the step 1 includes suspended discharge defect model, along face
Discharge defect model, spine discharge defect model and insulating part internal discharge defect model；
There is metal parts loosening or comes off to lead for simulating the 10kV inside switch cabinets in the suspended discharge defect model
Send a telegraph the inconsistent state in position；
The creeping discharge defect model has state during strong tangential component electric field for analog insulation sublist face；
There is electrode design manufacturing defect for simulation in the spine discharge defect model, wedge angle, the shape of spine projection occurs
State；
The insulating part internal discharge defect model is used for inside analog insulation part the state that there is bubble and impurity.
Preferably, the quantity of each typical shelf depreciation defect model be all higher than be equal to 10 and by adjusting electrode between
Away from, electrode curvature radius, tangent line electric field component ratio, the mode of bubble volume obtain.
Preferably, the step 2 includes：
The transient state ground potential signal of the local discharge defect of 2-1. measurements；
The transient state ground potential signal of the local discharge defect of 2-2. statistics, obtains defect statistics collection of illustrative plates；Wherein, the defect system
Meter collection of illustrative plates is pulse number-pulse amplitude collection of illustrative plates.
Preferably, the abscissa of the pulse number-pulse amplitude collection of illustrative plates in the step 2-2 be pulse amplitude, its indulge
Coordinate is the excitation pulse number of times of respective pulses amplitude.
Preferably, the step 3 includes：
The defect statistics collection of illustrative plates of various shelf depreciation defect types is counted, state is obtained and is judged spectrum library, the state
Judge that spectrum library is the state criterion comparison library of the 10kV switch cubicles；
Wherein, every kind of state judges that the picture number in spectrum library is more than or equal to 200.
Preferably, the step 5 includes：
5-1. calculates the degree of correlation σ of the tested 10kV switch cubicles statistics collection of illustrative plates and each defect statistics collection of illustrative plates respectively：
In formula (1), sijIt is two coincidence points of not cospectral graph；I, j be respectively the point where ranks number；
nijIt is misaligned point；
5-2. takes the average value of degree of correlation σAs the end value of every kind of defect statistics collection of illustrative plates；C is pulse number higher limit；
D is the pulse amplitude sum in pulse amplitude interval.
Preferably, the step 7 includes：
If the result of determination is creeping discharge, it is danger to assess the current 10kV switch cabinet states；
If the result of determination is insulating part internal discharge, the current 10kV switch cabinet states are assessed for existing defects；
If the result of determination is suspended discharge or spine discharging, it is presence to assess the current 10kV switch cabinet states
It is abnormal.
It can be seen from above-mentioned technical scheme that, the invention provides a kind of 10kV switch cabinet states detection method, set up
10kV switch cubicle test platforms；Obtain defect statistics collection of illustrative plates and state criterion comparison library；Measurement switch cubicle is locally put
The transient state ground electric wave amplitude of electricity；And judge transient state ground electric wave amplitude whether higher than ambient noise；Contrast switch cubicle statistics collection of illustrative plates
With the defect statistics collection of illustrative plates in state criterion comparison library and calculate the degree of correlation, obtain and relatively more tested switch cubicle statistical chart
The end value of spectrum and whole defect statistics collection of illustrative plates, the maximum collection of illustrative plates of setting value is result of determination；Current 10kV is assessed to open
Close cabinet state.Method proposed by the present invention, it is to avoid state is sentenced in the switch cabinet state assessment that tradition is set up according to threshold method
Determine the weak point of standard method, can accurately, efficiently and reliably reflect the time of day of switch cubicle；Improve 10kV
The operation stability and security of switch cubicle, and then ensure that the safety in operation and stability of power distribution network.
With immediate prior art ratio, the present invention provide technical scheme there is following excellent effect：
1st, in technical scheme provided by the present invention, it is to avoid in the switch cabinet state assessment that tradition is set up according to threshold method
The weak point of state criterion method, can accurately, efficiently and reliably reflect the time of day of switch cubicle；Improve
The operation stability and security of 10kV switch cubicles, and then ensure that the safety in operation and stability of power distribution network.
2nd, the technical scheme that the present invention is provided, is widely used, with significant Social benefit and economic benefit.
Brief description of the drawings
Fig. 1 is a kind of flow chart of 10kV switch cabinet states detection method of the invention；
Fig. 2 is the schematic flow sheet of step 2 in detection method of the invention；
Fig. 3 is the schematic flow sheet of step 5 in detection method of the invention；
Fig. 4 is the 10kV switch cabinets in a kind of concrete application example of 10kV switch cabinet states detection method of the invention
The flow chart of state criterion；
Fig. 5 is the use flow chart of the 10kV switch cabinet state criterion in concrete application example of the invention；
Fig. 6 is the canonical reference collection of illustrative plates in concrete application example of the invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground description, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Base
In embodiments of the invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
As shown in figure 1, the present invention provides a kind of 10kV switch cabinet states detection method, comprise the following steps：
Step 1. sets up the 10kV switch cubicle test platforms for including typical shelf depreciation defect model；
Step 2. is measured and counts the transient state ground potential signal of local discharge defect, obtains defect statistics collection of illustrative plates；
Step 3. counts the defect statistics collection of illustrative plates of various shelf depreciation defect types, obtains state criterion comparison library；
The transient state ground electric wave amplitude of the tested 10kV partial discharge of switchgear of step 4. measurement；And judge transient state ground electric wave amplitude
Whether it is higher than ambient noise；
If so, then counting transient state ground electric wave amplitude, tested 10kV switch cubicles statistics collection of illustrative plates is obtained；Into step 5；
If it is not, then judging that tested 10kV switch cubicles are in normal condition, detection terminates；
Step 5. carries out tested 10kV switch cubicles statistics collection of illustrative plates with the defect statistics collection of illustrative plates in state criterion comparison library
The degree of correlation is contrasted and calculated one by one, takes the average value of the degree of correlation as the end value of every kind of defect statistics collection of illustrative plates；
The end value of the defect statistics collection of illustrative plates of the relatively more tested 10kV switch cubicles statistics collection of illustrative plates of step 6. and whole, setting value is most
Big collection of illustrative plates is result of determination；
Step 7. assesses current 10kV switch cabinet states according to result of determination.
Wherein, the typical shelf depreciation defect model in step 1 includes suspended discharge defect model, creeping discharge Defect Modes
Type, spine discharge defect model and insulating part internal discharge defect model；
There is metal parts loosening or comes off to cause current potential not for simulating 10kV inside switch cabinets in suspended discharge defect model
Consistent state；
Creeping discharge defect model has state during strong tangential component electric field for analog insulation sublist face；
There is electrode design manufacturing defect for simulation in spine discharge defect model, wedge angle, the state of spine projection occurs；
Insulating part internal discharge defect model is used for inside analog insulation part the state that there is bubble and impurity.
Wherein, the quantity of each typical shelf depreciation defect model is all higher than being equal to 10 and by adjusting electrode spacing, electricity
Pole radius of curvature, tangent line electric field component ratio, the mode of bubble volume are obtained.
As shown in Fig. 2 step 2 includes：
The transient state ground potential signal of the local discharge defect of 2-1. measurements；
The transient state ground potential signal of the local discharge defect of 2-2. statistics, obtains defect statistics collection of illustrative plates；Wherein, defect statistics figure
It is pulse number-pulse amplitude collection of illustrative plates to compose.
Wherein, the abscissa of the pulse number in step 2-2-pulse amplitude collection of illustrative plates is pulse amplitude, its ordinate to correspond to
The excitation pulse number of times of pulse amplitude.
Wherein, step 3 includes：
The defect statistics collection of illustrative plates of various shelf depreciation defect types is counted, the state that obtains judges spectrum library, state judges collection of illustrative plates
Storehouse is the state criterion comparison library of 10kV switch cubicles；
Wherein, every kind of state judges that the picture number in spectrum library is more than or equal to 200.
As shown in figure 3, step 5 includes：
5-1. calculates the degree of correlation σ of tested 10kV switch cubicles statistics collection of illustrative plates and each defect statistics collection of illustrative plates respectively：
In formula (1), sijIt is two coincidence points of not cospectral graph；I, j be respectively the point where ranks number；
nijIt is misaligned point；
5-2. takes the average value of degree of correlation σAs the end value of every kind of defect statistics collection of illustrative plates；C is pulse number higher limit；
D is the pulse amplitude sum in pulse amplitude interval.
Wherein, step 7 includes：
If it is determined that result is creeping discharge, then it is danger to assess current 10kV switch cabinet states；
If it is determined that result is insulating part internal discharge, then current 10kV switch cabinet states are assessed for existing defects；
If it is determined that result is suspended discharge or spine discharging, then it is in the presence of exception to assess current 10kV switch cabinet states.
As shown in Figures 4 and 5, the present invention provides a kind of concrete application example of 10kV switch cabinet states detection method, as follows：
(1) initially set up with suspended discharge, creeping discharge, spine electric discharge, the typical office of 4 kinds of insulating part internal discharge
The switch cubicle test platform of portion's discharge defect.Wherein, suspended discharge model is used for metal parts occur inside analog switch cabinet
Loosen or come off the situation for causing current potential inconsistent；Creeping discharge model has strong tangential component for analog insulation sublist face
Situation during electric field；There is electrode design manufacturing defect for simulation in spine discharging model, wedge angle, spine projection occurs
Situation；Insulating part internal discharge model is used for there is the situations such as bubble, impurity inside analog insulation part.
Wherein, the model quantity of every kind of discharge defect is not less than 10, by adjust electrode spacing, electrode curvature radius,
The modes such as tangent line electric field component ratio, bubble volume are obtained.
(2) then the local discharge defect of measurement transient state ground potential signal, and statistical analysis is carried out to signal, form arteries and veins
Jig frequency number-pulse amplitude statistics collection of illustrative plates.The abscissa of pulse amplitude collection of illustrative plates is pulse amplitude, and unit is dB, and ordinate is right
Answer the excitation pulse number of times of pulse amplitude.As shown in fig. 6, the abscissa scope of standard diagram is 0-50, ordinate scope
It is 0-100.
(3) collection of illustrative plates of different shelf depreciation defect types is accumulated, state is formed and is judged spectrum library, as judgment basis.
Preferably, picture number is not less than 200 in every kind of discharge defect spectrum library.
(4) when needing the collection of illustrative plates for judging to compare with collection of illustrative plates in comparison library, preferential choosing, taking pulse amplitude interval is
9dB-33dB, totally 25 are worth.In this 25 pulse amplitude values, the pulse number upper limit is taken for 100 times.Then in warp
In the pulse amplitude collection of illustrative plates crossed after above-mentioned preliminary treatment, laterally 100,25 grid lines in longitudinal direction, by collection of illustrative plates point are drawn
2500 crosspoints are segmented into, all crosspoints are divided into " null point " and " real point " two class, for example, it is assumed that pulse amplitude is
The pulse number of 25dB is 30, then abscissa is 25, and ordinate is that 30 point is " real point ", and ordinate is 31
Point is then " null point ".If in a certain pulse amplitude collection of illustrative plates, certain point is null point, then be designated as " 0 " point；Another point
It is real point, then the point is designated as " 1 ", by that analogy, whole pulse amplitude collection of illustrative plates can be converted into one by 0 and 1 liang
The matrix of the 100*25 that dvielement is constituted.After the collection of illustrative plates of any two group pulses amplitude distribution data is converted into matrix, lead to
Cross the comparing of identical points, you can relatively accurately analyze two similarities of different discharge pulse amplitude collection of illustrative plates.Using formula
(1) method calculates similarity.If the coincidence point of two different collection of illustrative plates is designated as sij, misaligned point is designated as nij, wherein i,
J be respectively the point where ranks number.The similarity of two collection of illustrative plates is designated as σ, then can obtain following formula：
In this way, the similarity of collection of illustrative plates in collection of illustrative plates to be determined and 4 kinds of comparison libraries, the phase of each spectrum library are calculated respectively
Knowledge and magnanimity are tried to achieve using the average value in spectrum libraryMeter, you can obtain collection of illustrative plates to be determined similar to all kinds electric discharge collection of illustrative plates
Degree, takes soprano as recognition result.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than its limitations, although with reference to above-described embodiment to this
Invention has been described in detail, and those of ordinary skill in the art can still enter to specific embodiment of the invention
Row modification or equivalent, and these are without departing from any modification of spirit and scope of the invention or equivalent, its is equal
Applying within pending claims of the invention.
Claims (8)
1. a kind of 10kV switch cabinet states detection method, it is characterised in that methods described comprises the following steps：
Step 1. sets up the 10kV switch cubicle test platforms for including typical shelf depreciation defect model；
Step 2. is measured and counts the transient state ground potential signal of local discharge defect, obtains defect statistics collection of illustrative plates；
Step 3. counts the defect statistics collection of illustrative plates of various shelf depreciation defect types, obtains state criterion comparison
Storehouse；
The transient state ground electric wave amplitude of the tested 10kV partial discharge of switchgear of step 4. measurement；And judge transient state ground electric wave
Whether amplitude is higher than ambient noise；
If so, then counting transient state ground electric wave amplitude, tested 10kV switch cubicles statistics collection of illustrative plates is obtained；Into step 5；
If it is not, then judging that the tested 10kV switch cubicles are in normal condition, detection terminates；
Step 5. is by the defect in the tested 10kV switch cubicles statistics collection of illustrative plates and the state criterion comparison library
Statistics collection of illustrative plates is contrasted and is calculated the degree of correlation one by one, takes the average value of the degree of correlation as the final of every kind of defect statistics collection of illustrative plates
Value；
Step 6. compares the end value of the tested 10kV switch cubicles statistics collection of illustrative plates and the defect statistics collection of illustrative plates of whole, setting
It is result of determination to be worth maximum collection of illustrative plates；
Step 7. assesses the current 10kV switch cabinet states according to result of determination.
2. the method for claim 1, it is characterised in that the described typical shelf depreciation in the step 1 lacks
Falling into model includes suspended discharge defect model, and creeping discharge defect model is put inside spine discharge defect model and insulating part
Electric defect model；
There is metal parts loosening or comes off to lead for simulating the 10kV inside switch cabinets in the suspended discharge defect model
Send a telegraph the inconsistent state in position；
The creeping discharge defect model has state during strong tangential component electric field for analog insulation sublist face；
There is electrode design manufacturing defect for simulation in the spine discharge defect model, wedge angle, the shape of spine projection occurs
State；
The insulating part internal discharge defect model is used for inside analog insulation part the state that there is bubble and impurity.
3. method as claimed in claim 2, it is characterised in that
The quantity of each typical shelf depreciation defect model is all higher than being equal to 10 and by adjusting electrode spacing, electrode
Radius of curvature, tangent line electric field component ratio, the mode of bubble volume are obtained.
4. the method for claim 1, it is characterised in that the step 2 includes：
The transient state ground potential signal of the local discharge defect of 2-1. measurements；
The transient state ground potential signal of the local discharge defect of 2-2. statistics, obtains defect statistics collection of illustrative plates；Wherein, the defect system
Meter collection of illustrative plates is pulse number-pulse amplitude collection of illustrative plates.
5. method as claimed in claim 4, it is characterised in that the pulse number-pulse in the step 2-2
The excitation pulse number of times that the abscissa of amplitude collection of illustrative plates is pulse amplitude, its ordinate is respective pulses amplitude.
6. the method for claim 1, it is characterised in that the step 3 includes：
The defect statistics collection of illustrative plates of various shelf depreciation defect types is counted, state is obtained and is judged spectrum library, the state
Judge that spectrum library is the state criterion comparison library of the 10kV switch cubicles；
Wherein, every kind of state judges that the picture number in spectrum library is more than or equal to 200.
7. the method for claim 1, it is characterised in that the step 5 includes：
5-1. calculates the degree of correlation σ of the tested 10kV switch cubicles statistics collection of illustrative plates and each defect statistics collection of illustrative plates respectively：
In formula (1), sijIt is two coincidence points of not cospectral graph；I, j be respectively the point where ranks number；
nijIt is misaligned point；
5-2. takes the average value of degree of correlation σAs the end value of every kind of defect statistics collection of illustrative plates；C is pulse number higher limit；
D is the pulse amplitude sum in pulse amplitude interval.
8. method as claimed in claim 2, it is characterised in that the step 7 includes：
If the result of determination is creeping discharge, it is danger to assess the current 10kV switch cabinet states；
If the result of determination is insulating part internal discharge, the current 10kV switch cabinet states are assessed for existing defects；
If the result of determination is suspended discharge or spine discharging, it is presence to assess the current 10kV switch cabinet states
It is abnormal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109088328A (en) * | 2018-09-10 | 2018-12-25 | 国网河北省电力有限公司沧州供电分公司 | A kind of switchgear security maintenance system |
| CN110554281A (en) * | 2019-08-26 | 2019-12-10 | 广州供电局有限公司 | Inspection method, maintenance method and inspection system for electrical equipment |
| CN113568353A (en) * | 2021-07-30 | 2021-10-29 | 国网四川省电力公司电力科学研究院 | Switch cabinet partial discharge monitoring and early warning method based on reduced state feature set |
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| CN110554281A (en) * | 2019-08-26 | 2019-12-10 | 广州供电局有限公司 | Inspection method, maintenance method and inspection system for electrical equipment |
| CN113568353A (en) * | 2021-07-30 | 2021-10-29 | 国网四川省电力公司电力科学研究院 | Switch cabinet partial discharge monitoring and early warning method based on reduced state feature set |
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| Publication number | Publication date |
|---|---|
| CN106814290B (en) | 2019-11-08 |
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