CN104991168A - Cable running state assessment method and system - Google Patents
Cable running state assessment method and system Download PDFInfo
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- CN104991168A CN104991168A CN201510491260.8A CN201510491260A CN104991168A CN 104991168 A CN104991168 A CN 104991168A CN 201510491260 A CN201510491260 A CN 201510491260A CN 104991168 A CN104991168 A CN 104991168A
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Abstract
Provided is a cable running state assessment method and system. The method is characterized by obtaining characteristic quantity of a cable, wherein the characteristic quantity comprises insulation resistance value, insulation resistance absorption ratio, average value of dielectric loss angle tangent values, linear fitting slope, residual sum of squares, partial discharge quantity, partial discharge quantity increment, partial discharge frequency, concentrated partial discharge point positions and harmful discharge information; judging grade of each characteristic quantity according to a preset standard; and obtaining a state assessment result according to the weight corresponding to the grade of each characteristic quantity. According to the cable running state assessment method and system, the obtained characteristic quantity comprises the insulation resistance value, the insulation resistance absorption ratio, the average value of dielectric loss angle tangent values, the linear fitting slope, the residual sum of squares, the partial discharge quantity, the partial discharge quantity increment, the partial discharge frequency, the concentrated partial discharge point positions and the harmful discharge information, so that the running state of the cable cam be evaluated more completely and accurately.
Description
Technical field
The present invention relates to cable quality evaluation areas, particularly relate to a kind of cable running status appraisal procedure and system.
Background technology
At present, the Cable Insulation Diagnosis Technology of power supply enterprise's application can be roughly divided into the diagnostic techniques based on non-electric quantity and the diagnostic techniques based on electric parameters.
For the power cable line of all insulation structure, the diagnostic techniques based on non-electric quantity mainly contains infrared measurement of temperature method and optical fiber temperature-measurement method.Infrared measurement of temperature method mainly utilizes the no-go sub of thermal infrared imager Cables for Dam Observation circuit and intermediate head compared with the Temperature Distribution under heavy load condition, judges whether cable line has local hot spot with or without cable splice place under Overload or normal load state.Optical fiber temperature-measurement method is in cable or cable presets fibre optic temperature sensor outward, according to laid condition and the cable temperature regularity of distribution of cable, finds temperature overheating point, avoid cable line that heat ageing or thermal breakdown occurred by thermometric.Two kinds of methods are all from temperature angle, in conjunction with the load condition of cable, and the running status of assessment cable line, but be all easily subject to the interference of environmental factor.
The electric parameters detected based on the diagnostic techniques of electric parameters mainly contains insulation resistance, dielectric loss angle tangent (tan δ) and shelf depreciation.Concrete diagnostic techniques method mainly contains the resistance to platen press of industrial frequency AC, ultralow frequency ac voltage withstanding method, tan δ detection method, oscillating wave voltage method, pulse current method etc.These methods all exist can not problem that is complete, assessment cable running status accurately.
Summary of the invention
Based on this, be necessary to provide a kind of more complete and cable running status appraisal procedure that accuracy is high.
A kind of cable running status appraisal procedure, comprises step:
Obtain the characteristic quantity of cable, described characteristic quantity comprise insulating resistance value, insulation resistance absorptance, dielectric loss angle tangent mean value, linear fit slope, residual sum of squares (RSS), partial discharge quantity, partial discharge quantity increment, shelf depreciation number of times, concentrate shelf depreciation point position and Harmful discharges situation;
Grade belonging to each described characteristic quantity is judged according to preset standard;
Weight belonging to each described characteristic quantity corresponding to grade, obtains condition evaluation results.
A kind of cable running status evaluating system, comprising:
Acquisition module, for obtaining the characteristic quantity of cable, described characteristic quantity comprises insulating resistance value, insulation resistance absorptance, the mean value of dielectric loss angle tangent, linear fit slope, residual sum of squares (RSS), partial discharge quantity, partial discharge quantity increment, shelf depreciation number of times, concentrates shelf depreciation point position and Harmful discharges situation;
Judge module, for judging grade belonging to each described characteristic quantity according to preset standard;
Evaluation module, for the weight belonging to each described characteristic quantity corresponding to grade, obtains condition evaluation results.
Above-mentioned cable running status appraisal procedure and system, the characteristic quantity obtained comprises insulating resistance value, insulation resistance absorptance, the mean value of dielectric loss angle tangent, linear fit slope, residual sum of squares (RSS), partial discharge quantity, partial discharge quantity increment, shelf depreciation number of times, concentrates shelf depreciation point position and Harmful discharges situation, therefore, it is possible to running status that is more complete, that assess cable accurately.
Accompanying drawing explanation
Fig. 1 is a kind of process flow diagram of cable running status appraisal procedure of embodiment;
Fig. 2 is pulse current method Partial Discharge Detection test connection schematic diagram;
Fig. 3 is the particular flow sheet of a step of Fig. 1;
Fig. 4 is the structural drawing of the dielectric loss measuring instrument adopted in an embodiment;
Fig. 5 is a kind of structural drawing of cable running status evaluating system of embodiment;
Fig. 6 is the concrete structure figure of a module of Fig. 5.
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.
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 " or/and " comprise arbitrary and all combinations of one or more relevant Listed Items.
As shown in Figure 1, a kind of cable running status appraisal procedure of embodiment, comprises the following steps:
S110: the characteristic quantity obtaining cable.Wherein, described characteristic quantity comprises insulating resistance value, insulation resistance absorptance, the mean value of dielectric loss angle tangent, linear fit slope, residual sum of squares (RSS), partial discharge quantity, partial discharge quantity increment, shelf depreciation number of times, concentrates shelf depreciation point position and Harmful discharges situation.
Wherein in an embodiment, the pulse current method Partial Discharge Detection test connection schematic diagram of the prior art according to Fig. 2, carries out cable status test experience.Power frequency high voltage is provided without office's discharge source, the cable carrying out testing is connected to through capacitive divider and coupling condenser, PD meter is through amplifier butt coupling capacitor and gather discharge signal, A.C. voltmeter access capacitive divider also measures trial voltage, in the present embodiment, PD meter is JF-2008 PD meter.For PDBase system (PDBase partial discharge test system), current transformer entangles cable shield ground wire, connect the collecting unit of PDBase system through concentric cable, PDBase system and computer for controlling carry out communication by optical fiber and network cable converter.
Found through experiments, insulating resistance value, the larger cable status of insulation resistance absorptance are better; The mean value of dielectric loss angle tangent, linear fit slope, residual sum of squares (RSS), partial discharge quantity, partial discharge quantity increment, the less cable status of shelf depreciation number of times are better; Concentrate shelf depreciation point position more concentrated, the local defect possibility that cable exists is larger, and cable status is poorer; The fewer cable status of Harmful discharges situation is better.
S130: judge grade belonging to each described characteristic quantity according to preset standard.
Described grade comprises outstanding level, regular grade, difference level.Wherein, outstanding level represents that cable status is good, and regular grade represents that cable status is general, and difference level represents that cable status is poor.
S150: the weight belonging to each described characteristic quantity corresponding to grade, obtains condition evaluation results.
Described weight can be mark.Particularly, pre-set the mark corresponding to affiliated grade of each described characteristic quantity, and the mark corresponding to grade belonging to each described characteristic quantity is added, obtain condition evaluation results.Wherein in an embodiment, the mark of described outstanding level correspondence is 10 points, and mark corresponding to described regular grade is 6 points, and the mark of described poor level correspondence is 2 points.The total score of condition evaluation results is higher, shows that cable status is better.Number due to characteristic quantity is 10, so full marks are 100 points, corresponding with the full marks in daily learning life, meets the conventional thought custom of user.Understandable, above-mentioned mark also can replace with number percent.
Wherein in an embodiment, described preset standard is:
Described insulating resistance value belongs to outstanding level when being greater than 1000G Ω (gigohm), belongs to regular grade, belong to poor level when being less than 100G Ω time in the scope of 100 ~ 1000G Ω;
Described insulation resistance absorptance belongs to outstanding level when being greater than 1, belongs to regular grade time in the scope of 0.9 ~ 1, belongs to poor level when being less than 0.9;
The mean value of described dielectric loss angle tangent belongs to outstanding level when being less than 0.002%, belongs to regular grade time in the scope of 0.002% ~ 0.05%, belongs to poor level when being greater than 0.05%;
Described linear fit slope belongs to outstanding level when being less than 0.005, belongs to regular grade time in the scope of 0.005 ~ 0.01, belongs to poor level when being greater than 0.01;
Described residual sum of squares (RSS) is less than 1e
-5time belong to outstanding level, at 1e
-5~ 1e
-3scope in time belong to regular grade, be greater than 1e
-3time belong to poor level;
Described partial discharge quantity belongs to outstanding level when being less than 5pC, belongs to regular grade, belong to poor level when being greater than 200pC time in the scope of 5pC (skin coulomb) ~ 200pC;
Described partial discharge quantity increment belongs to outstanding level when being less than 10pC, belongs to regular grade time in the scope of 10pC ~ 100pC, belongs to poor level when being greater than 100pC;
Described shelf depreciation number of times belongs to outstanding level when being less than 1, belongs to regular grade time in the scope of 1 ~ 10, belongs to poor level when being greater than 10;
Described concentrated shelf depreciation point position, for belonging to outstanding level when not existing, belongs to regular grade, belongs to poor level time on cable splice time on cable body;
Described Harmful discharges situation is without belonging to outstanding level during Harmful discharges, belongs to regular grade when may there is Harmful discharges, exists when determining Harmful discharges and belongs to poor level.
Wherein in an embodiment, as shown in Figure 3, the step of the characteristic quantity of described acquisition cable comprises:
S111: the insulating resistance value and the insulation resistance absorptance that obtain the cable that Insulation Resistance Tester records.
S112: the dielectric loss angle tangent of cable under the different voltages that acquisition dielectric loss measuring instrument records.
In the present embodiment, the dielectric loss angle tangent of cable measured respectively by dielectric loss measuring instrument under 4kV, 5.5kV, 7kV, 8.5kV and 10kV voltage.
Fig. 4 is the structural drawing of the dielectric loss measuring instrument of the prior art adopted in an embodiment.Wherein, the built-in Fourier transform of metering circuit and complex operation function, controllable amounts journey switches and variable-frequency power sources simultaneously.Guidance panel comprises operation push-button and display.The built-in SPWM of variable-frequency power sources (SinusoidalPWM, three phase sine width modulation) circuit, Absorbable organic halogens exports high-power sine wave.Variable-frequency power sources output voltage can be risen to measuring voltage by step-up transformer.In internal standard capacitor, Cn is as measuring basis.Cx reverse wiring current detection module is only for the current detecting of reverse wiring, and measurement range is 0.01 ~ 1A.Reverse wiring current signal can be delivered to low-pressure side by numeral isolation communication module, can isolate the highest 20kV voltage.The dielectric loss angle tangent of test cable after 30 times, 40 times, 50 times and 60 circulations respectively, examination pressurization sequence, for being initial test voltage with 4kV, be that voltage increment is forced into 10kV, then inverted order is depressurized to 4kV successively with 1.5kV.
S113: the mean value of described dielectric loss angle tangent, dielectric loss and the linear fit slope of voltage and the residual sum of squares (RSS) of dielectric loss and voltage under calculating different voltage by described dielectric loss angle tangent.
The linear fit slope of dielectric loss and voltage and the residual sum of squares (RSS) of dielectric loss and voltage can be calculated by the relation of dielectric loss angle tangent and voltage.Wherein in an embodiment, can also draw out the curve map of dielectric loss angle tangent and voltage according to voltage and dielectric loss angle tangent, analysis meter calculates the linear fit slope of dielectric loss and voltage and the residual sum of squares (RSS) of dielectric loss and voltage.
Wherein in an embodiment, the step of the characteristic quantity of described acquisition cable comprises:
Described partial discharge quantity, described partial discharge quantity increment, described shelf depreciation number of times, described concentrated shelf depreciation point position and described Harmful discharges situation is obtained by shelf depreciation system; Described shelf depreciation system comprises PDBase system, PD meter and OWTS system.Described by shelf depreciation system obtain described partial discharge quantity, described partial discharge quantity increment, described shelf depreciation number of times, described concentrated shelf depreciation point position and described Harmful discharges situation step comprise the following steps, namely the step of the characteristic quantity of described acquisition cable also comprises:
S114: the partial discharge quantity and the partial discharge quantity increment that obtain the cable that PDBase system, PD meter or OWTS system (Oscillating waveform testsystem, wave of oscillation pilot system) record.
In the present embodiment, can by PDBase system, PD meter or OWTS system, any one or a few is tested cable.Obtain partial discharge quantity and the partial discharge quantity increment of the cable recorded.
Wherein, the instantaneous value of PD meter to local discharge signal gathers, and discharge capacity has local discharge signal and weighs intuitively, have higher sensitivity.
The described shelf depreciation number of times that S115: acquisition OWTS system records and shelf depreciation point location figure, and by concentrating shelf depreciation point position described in the map analysis of described shelf depreciation point location.
OWTS system by the position of pulse reflection method location shelf depreciation, and can reflect the discharge capacity and discharge time with centrality point of discharge by shelf depreciation distribution plan intuitively.
In the present embodiment, shelf depreciation number of times and shelf depreciation point location figure can be obtained by OWTS system.Concentrated shelf depreciation point position is obtained by the shelf depreciation point location map analysis got.Concentrated partial discharge position can for not exist, on cable body and on cable splice.
S116: the local discharge signal obtaining PDBase system acquisition, and analyze Harmful discharges situation according to described local discharge signal.
PDBase system can characterize the statistical nature of discharge signal in the sampling time, has the characteristic differentiating shelf depreciation type.
Described local discharge signal comprise in corona discharge, creeping discharge, internal discharge, noise and invalid data any one or multiple.
When noise and invalid data stable, can determine local discharge signal whether comprise corona discharge, creeping discharge or internal discharge time, determine that harmful discharge scenario is for existing Harmful discharges or there is not Harmful discharges by whether comprising corona discharge, creeping discharge or internal discharge.
When noise and invalid data instability, can not determine local discharge signal whether comprise corona discharge, creeping discharge or internal discharge time, for may Harmful discharges be there is in Harmful discharges situation.
Above-mentioned cable running status appraisal procedure, the characteristic quantity obtained comprises insulating resistance value, insulation resistance absorptance, the mean value of dielectric loss angle tangent, linear fit slope, residual sum of squares (RSS), partial discharge quantity, partial discharge quantity increment, shelf depreciation number of times, concentrates shelf depreciation point position and Harmful discharges situation, therefore, it is possible to running status that is more complete, that assess cable accurately.
As shown in Figure 5, a kind of cable running status evaluating system of embodiment, comprising:
Acquisition module 110, for obtaining the characteristic quantity of cable.Wherein, described characteristic quantity comprises insulating resistance value, insulation resistance absorptance, the mean value of dielectric loss angle tangent, linear fit slope, residual sum of squares (RSS), partial discharge quantity, partial discharge quantity increment, shelf depreciation number of times, concentrates shelf depreciation point position and Harmful discharges situation.
Wherein in an embodiment, the pulse current method Partial Discharge Detection test connection schematic diagram of the prior art according to Fig. 2, carries out cable status test experience.There is provided power frequency high voltage without office's discharge source, be connected to the cable carrying out testing through capacitive divider and coupling condenser, PD meter is through amplifier butt coupling capacitor and gather discharge signal, and A.C. voltmeter access capacitive divider also measures trial voltage.For PDBase system, current transformer entangles cable shield ground wire, and connect the collecting unit of PDBase system through concentric cable, PDBase system and computer for controlling carry out communication by optical fiber and network cable converter.
Found through experiments, insulating resistance value, the larger cable status of insulation resistance absorptance are better; The mean value of dielectric loss angle tangent, linear fit slope, residual sum of squares (RSS), partial discharge quantity, partial discharge quantity increment, the less cable status of shelf depreciation number of times are better; Concentrate shelf depreciation point position more concentrated, the local defect possibility that cable exists is larger, and cable status is poorer; The fewer cable status of Harmful discharges situation is better.
Judge module 130, for judging grade belonging to each described characteristic quantity according to preset standard.
Described grade comprises outstanding level, regular grade, difference level wherein, and outstanding level represents that cable status is good, and regular grade represents that cable status is general, and difference level represents that cable status is poor.
Evaluation module 150, for the weight belonging to each described characteristic quantity corresponding to grade, obtains condition evaluation results.
Described weight can be mark.Particularly, pre-set the mark corresponding to affiliated grade of each described characteristic quantity, and the mark corresponding to grade belonging to each described characteristic quantity is added, obtain condition evaluation results.Wherein in an embodiment, the mark of described outstanding level correspondence is 10 points, and mark corresponding to described regular grade is 6 points, and the mark of described poor level correspondence is 2 points.The total score of condition evaluation results is higher, shows that cable status is better.Number due to characteristic quantity is 10, so full marks are 100 points, corresponding with the full marks in daily learning life, meets the conventional thought custom of user.Understandable, above-mentioned mark also can replace with number percent.
Wherein in an embodiment, described preset standard is:
Described insulating resistance value belongs to outstanding level when being greater than 1000G Ω, belongs to regular grade, belong to poor level when being less than 100G Ω time in the scope of 100 ~ 1000G Ω;
Described insulation resistance absorptance belongs to outstanding level when being greater than 1, belongs to regular grade time in the scope of 0.9 ~ 1, belongs to poor level when being less than 0.9;
The mean value of described dielectric loss angle tangent belongs to outstanding level when being less than 0.002%, belongs to regular grade time in the scope of 0.002% ~ 0.05%, belongs to poor level when being greater than 0.05%;
Described linear fit slope belongs to outstanding level when being less than 0.005, belongs to regular grade time in the scope of 0.005 ~ 0.01, belongs to poor level when being greater than 0.01;
Described residual sum of squares (RSS) is less than 1e
-5time belong to outstanding level, at 1e
-5~ 1e
-3scope in time belong to regular grade, be greater than 1e
-3time belong to poor level;
Described partial discharge quantity belongs to outstanding level when being less than 5pC, belongs to regular grade time in the scope of 5pC ~ 200pC, belongs to poor level when being greater than 200pC;
Described partial discharge quantity increment belongs to outstanding level when being less than 10pC, belongs to regular grade time in the scope of 10pC ~ 100pC, belongs to poor level when being greater than 100pC;
Described shelf depreciation number of times belongs to outstanding level when being less than 1, belongs to regular grade time in the scope of 1 ~ 10, belongs to poor level when being greater than 10;
Described concentrated shelf depreciation point position, for belonging to outstanding level when not existing, belongs to regular grade, belongs to poor level time on cable splice time on cable body;
Described Harmful discharges situation is without belonging to outstanding level during Harmful discharges, belongs to regular grade when may there is Harmful discharges, exists when determining Harmful discharges and belongs to poor level.
Wherein in an embodiment, as shown in Figure 6, described acquisition module 110 comprises:
Insulation resistance acquiring unit 111, for obtaining insulating resistance value and the insulation resistance absorptance of the cable that Insulation Resistance Tester records.
Dielectric loss acquiring unit 112, for obtaining the dielectric loss angle tangent of cable under different voltages that dielectric loss measuring instrument records.
In the present embodiment, the dielectric loss angle tangent of cable measured respectively by dielectric loss measuring instrument under 4kV, 5.5kV, 7kV, 8.5kV and 10kV voltage.
Fig. 4 is the structural drawing of the dielectric loss measuring instrument of the prior art adopted in an embodiment.Wherein, the built-in Fourier transform of metering circuit and complex operation function, controllable amounts journey switches and variable-frequency power sources simultaneously.Guidance panel comprises operation push-button and display.The built-in SPWM circuit of variable-frequency power sources, Absorbable organic halogens exports high-power sine wave.Variable-frequency power sources output voltage can be risen to measuring voltage by step-up transformer.In internal standard capacitor, Cn is as measuring basis.Cx reverse wiring current detection module is only for the current detecting of reverse wiring, and measurement range is 0.01 ~ 1A.Reverse wiring current signal can be delivered to low-pressure side by numeral isolation communication module, can isolate the highest 20kV voltage.The dielectric loss angle tangent of test cable after 30 times, 40 times, 50 times and 60 circulations respectively, examination pressurization sequence, for being initial test voltage with 4kV, be that voltage increment is forced into 10kV, then inverted order is depressurized to 4kV successively with 1.5kV.
Dielectric loss computing unit 113, for the mean value of described dielectric loss angle tangent under calculating different voltage by described dielectric loss angle tangent, dielectric loss and the linear fit slope of voltage and the residual sum of squares (RSS) of dielectric loss and voltage.
The linear fit slope of dielectric loss and voltage and the residual sum of squares (RSS) of dielectric loss and voltage can be calculated by the relation of dielectric loss angle tangent and voltage.Wherein in an embodiment, can also draw out the curve map of dielectric loss angle tangent and voltage according to voltage and dielectric loss angle tangent, analysis meter calculates the linear fit slope of dielectric loss and voltage and the residual sum of squares (RSS) of dielectric loss and voltage.
Wherein in an embodiment, described acquisition module 110 is also for obtaining described partial discharge quantity, described partial discharge quantity increment, described shelf depreciation number of times, described concentrated shelf depreciation point position and described Harmful discharges situation by shelf depreciation system; Described shelf depreciation system comprises PDBase system, PD meter and OWTS system.Acquisition module 110 also comprises:
Partial discharge quantity acquiring unit 114, for obtaining partial discharge quantity and the partial discharge quantity increment of the cable that PDBase system, PD meter or OWTS system record.
In the present embodiment, can by PDBase system, PD meter or OWTS system, any one or a few is tested cable.Obtain partial discharge quantity and the partial discharge quantity increment of the cable recorded.
Wherein, the instantaneous value of PD meter to local discharge signal gathers, and discharge capacity has local discharge signal and weighs intuitively, have higher sensitivity.
Number of times position acquisition unit 115, for obtaining the described shelf depreciation number of times and shelf depreciation point location figure that OWTS system records, and by concentrating shelf depreciation point position described in the map analysis of described shelf depreciation point location.
OWTS system by the position of pulse reflection method location shelf depreciation, and can reflect the discharge capacity and discharge time with centrality point of discharge by shelf depreciation distribution plan intuitively.
In the present embodiment, shelf depreciation number of times and shelf depreciation point location figure can be obtained by OWTS system.Concentrated shelf depreciation point position is obtained by the shelf depreciation point location map analysis got.Concentrated partial discharge position can for not exist, on cable body and on cable splice.
Adverse condition acquiring unit 116, for obtaining the local discharge signal of PDBase system acquisition, and analyzes Harmful discharges situation according to described local discharge signal.
PDBase system can characterize the statistical nature of discharge signal in the sampling time, has the characteristic differentiating shelf depreciation type.
Described local discharge signal comprise in corona discharge, creeping discharge, internal discharge, noise and invalid data any one or multiple.
When noise and invalid data stable, can determine local discharge signal whether comprise corona discharge, creeping discharge or internal discharge time, determine that harmful discharge scenario is for existing Harmful discharges or there is not Harmful discharges by whether comprising corona discharge, creeping discharge or internal discharge.
When noise and invalid data instability, can not determine local discharge signal whether comprise corona discharge, creeping discharge or internal discharge time, for may Harmful discharges be there is in Harmful discharges situation.
Above-mentioned cable running status evaluating system, the characteristic quantity obtained comprises insulating resistance value, insulation resistance absorptance, the mean value of dielectric loss angle tangent, linear fit slope, residual sum of squares (RSS), partial discharge quantity, partial discharge quantity increment, shelf depreciation number of times, concentrates shelf depreciation point position and Harmful discharges situation, therefore, it is possible to running status that is more complete, that assess cable accurately.
Above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.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 multiple 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. a cable running status appraisal procedure, is characterized in that, comprises step:
Obtain the characteristic quantity of cable, described characteristic quantity comprise insulating resistance value, insulation resistance absorptance, dielectric loss angle tangent mean value, linear fit slope, residual sum of squares (RSS), partial discharge quantity, partial discharge quantity increment, shelf depreciation number of times, concentrate shelf depreciation point position and Harmful discharges situation;
Grade belonging to each described characteristic quantity is judged according to preset standard;
Belonging to each described characteristic quantity, weight corresponding to grade, obtains condition evaluation results.
2. cable running status appraisal procedure according to claim 1, is characterized in that, described weight is mark; Described belonging to each described characteristic quantity weight corresponding to grade, the step obtaining condition evaluation results is specially: the mark corresponding to affiliated grade pre-setting each described characteristic quantity, and the mark corresponding to grade belonging to each described characteristic quantity is added, obtain condition evaluation results;
Described grade comprises outstanding level, regular grade, difference level.
3. cable running status appraisal procedure according to claim 1, it is characterized in that, described preset standard is:
Described insulating resistance value belongs to outstanding level when being greater than 1000G Ω, belongs to regular grade, belong to poor level when being less than 100G Ω time in the scope of 100 ~ 1000G Ω;
Described insulation resistance absorptance belongs to outstanding level when being greater than 1, belongs to regular grade time in the scope of 0.9 ~ 1, belongs to poor level when being less than 0.9;
The mean value of described dielectric loss angle tangent belongs to outstanding level when being less than 0.002%, belongs to regular grade time in the scope of 0.002% ~ 0.05%, belongs to poor level when being greater than 0.05%;
Described linear fit slope belongs to outstanding level when being less than 0.005, belongs to regular grade time in the scope of 0.005 ~ 0.01, belongs to poor level when being greater than 0.01;
Described residual sum of squares (RSS) is less than 1e
-5time belong to outstanding level, at 1e
-5~ 1e
-3scope in time belong to regular grade, be greater than 1e
-3time belong to poor level;
Described partial discharge quantity belongs to outstanding level when being less than 5pC, belongs to regular grade time in the scope of 5pC ~ 200pC, belongs to poor level when being greater than 200pC;
Described partial discharge quantity increment belongs to outstanding level when being less than 10pC, belongs to regular grade time in the scope of 10pC ~ 100pC, belongs to poor level when being greater than 100pC;
Described shelf depreciation number of times belongs to outstanding level when being less than 1, belongs to regular grade time in the scope of 1 ~ 10, belongs to poor level when being greater than 10;
Described concentrated shelf depreciation point position, for belonging to outstanding level when not existing, belongs to regular grade, belongs to poor level time on cable splice time on cable body;
Described Harmful discharges situation is without belonging to outstanding level during Harmful discharges, belongs to regular grade when may there is Harmful discharges, exists when determining Harmful discharges and belongs to poor level.
4. cable running status appraisal procedure according to claim 1, is characterized in that, the step of the characteristic quantity of described acquisition cable comprises:
Obtain insulating resistance value and the insulation resistance absorptance of the cable that Insulation Resistance Tester records;
The dielectric loss angle tangent of cable under the different voltages that acquisition dielectric loss measuring instrument records;
The mean value of described dielectric loss angle tangent, dielectric loss and the described linear fit slope of voltage and the described residual sum of squares (RSS) of dielectric loss and voltage under calculating different voltage by described dielectric loss angle tangent.
5. cable running status appraisal procedure according to claim 1, it is characterized in that, the step of the characteristic quantity of described acquisition cable also comprises and obtains described partial discharge quantity, described partial discharge quantity increment, described shelf depreciation number of times, described concentrated shelf depreciation point position and described Harmful discharges situation by shelf depreciation system; Described shelf depreciation system comprises PDBase system, PD meter and OWTS system, described by shelf depreciation system obtain described partial discharge quantity, described partial discharge quantity increment, described shelf depreciation number of times, described concentrated shelf depreciation point position and described Harmful discharges situation step comprise:
Obtain the described partial discharge quantity of the cable that described PDBase system, described PD meter or described OWTS system record and described partial discharge quantity increment;
Obtain described shelf depreciation number of times and shelf depreciation point location figure that described OWTS system records, and by concentrating shelf depreciation point position described in the map analysis of described shelf depreciation point location;
Obtain the local discharge signal of described PDBase system acquisition, and analyze described Harmful discharges situation according to described local discharge signal.
6. cable running status appraisal procedure according to claim 5, is characterized in that, described local discharge signal comprise in corona discharge, creeping discharge, internal discharge, noise and invalid data any one or multiple.
7. a cable running status evaluating system, is characterized in that, comprising:
Acquisition module, for obtaining the characteristic quantity of cable, described characteristic quantity comprises insulating resistance value, insulation resistance absorptance, the mean value of dielectric loss angle tangent, linear fit slope, residual sum of squares (RSS), partial discharge quantity, partial discharge quantity increment, shelf depreciation number of times, concentrates shelf depreciation point position and Harmful discharges situation;
Judge module, for judging grade belonging to each described characteristic quantity according to preset standard;
Evaluation module, for the weight belonging to each described characteristic quantity corresponding to grade, obtains condition evaluation results.
8. cable running status evaluating system according to claim 7, it is characterized in that, described preset standard is:
Described insulating resistance value belongs to outstanding level when being greater than 1000G Ω, belongs to regular grade, belong to poor level when being less than 100G Ω time in the scope of 100 ~ 1000G Ω;
Described insulation resistance absorptance belongs to outstanding level when being greater than 1, belongs to regular grade time in the scope of 0.9 ~ 1, belongs to poor level when being less than 0.9;
The mean value of described dielectric loss angle tangent belongs to outstanding level when being less than 0.002%, belongs to regular grade time in the scope of 0.002% ~ 0.05%, belongs to poor level when being greater than 0.05%;
Described linear fit slope belongs to outstanding level when being less than 0.005, belongs to regular grade time in the scope of 0.005 ~ 0.01, belongs to poor level when being greater than 0.01;
Described residual sum of squares (RSS) is less than 1e
-5time belong to outstanding level, at 1e
-5~ 1e
-3scope in time belong to regular grade, be greater than 1e
-3time belong to poor level;
Described partial discharge quantity belongs to outstanding level when being less than 5pC, belongs to regular grade time in the scope of 5pC ~ 200pC, belongs to poor level when being greater than 200pC;
Described partial discharge quantity increment belongs to outstanding level when being less than 10pC, belongs to regular grade time in the scope of 10pC ~ 100pC, belongs to poor level when being greater than 100pC;
Described shelf depreciation number of times belongs to outstanding level when being less than 1, belongs to regular grade time in the scope of 1 ~ 10, belongs to poor level when being greater than 10;
Described concentrated shelf depreciation point position, for belonging to outstanding level when not existing, belongs to regular grade, belongs to poor level time on cable splice time on cable body;
Described Harmful discharges situation is without belonging to outstanding level during Harmful discharges, belongs to regular grade when may there is Harmful discharges, exists when determining Harmful discharges and belongs to poor level.
9. cable running status evaluating system according to claim 7, it is characterized in that, described acquisition module comprises:
Insulation resistance acquiring unit, for obtaining insulating resistance value and the insulation resistance absorptance of the cable that Insulation Resistance Tester records;
Dielectric loss acquiring unit, for obtaining the dielectric loss angle tangent of cable under different voltages that dielectric loss measuring instrument records;
Dielectric loss computing unit, for the mean value of described dielectric loss angle tangent under calculating different voltage by described dielectric loss angle tangent, dielectric loss and the described linear fit slope of voltage and the described residual sum of squares (RSS) of dielectric loss and voltage.
10. cable running status evaluating system according to claim 9, it is characterized in that, described acquisition module is also for obtaining described partial discharge quantity, described partial discharge quantity increment, described shelf depreciation number of times, described concentrated shelf depreciation point position and described Harmful discharges situation by shelf depreciation system; Described shelf depreciation system comprises PDBase system, PD meter and OWTS system; Described acquisition module also comprises:
Partial discharge quantity acquiring unit, for obtaining the described partial discharge quantity of the cable that described PDBase system, described PD meter or described OWTS system record and described partial discharge quantity increment;
Number of times position acquisition unit, for obtaining the described shelf depreciation number of times and shelf depreciation point location figure that described OWTS system records, and by concentrating shelf depreciation point position described in the map analysis of described shelf depreciation point location;
Adverse condition acquiring unit, for obtaining the local discharge signal of described PDBase system acquisition, and analyzes described Harmful discharges situation according to described local discharge signal.
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