CN106019089A - Method for carrying out partial discharging determination based on related relationship feature of alternate signals - Google Patents
Method for carrying out partial discharging determination based on related relationship feature of alternate signals Download PDFInfo
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- CN106019089A CN106019089A CN201610312148.8A CN201610312148A CN106019089A CN 106019089 A CN106019089 A CN 106019089A CN 201610312148 A CN201610312148 A CN 201610312148A CN 106019089 A CN106019089 A CN 106019089A
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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
- G01R31/1263—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 solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Abstract
The invention relates to a method for carrying out partial discharging determination based on a related relationship feature of alternate signals. The method comprises: (1), pulse current signals of an A phase, a B phase and a C phase are collected and are transmitted to partial discharging detector for processing by a coaxial line; (2), threshold logic determination and neural network determination are carried out on the processed signals to obtain zero-level, first-level, second-level, and third-level threshold logic determination results and zero-level, first-level, second-level, and third-level neural network determination results; (3), according to the threshold logic determination results and the neural network determination results, integrated determination is carried out, thereby obtaining alarm-free, low-level-alarm, middle-level-alarm, and high-level-alarm integrated determination results; and (4), on the basis of the integrated determination results of the three phase of signals, association determination is carried out to obtain a final result. Compared with the prior art, the method has the following advantages of high precision, high accuracy, and great convenience for testing staff.
Description
Technical field
The invention belongs to power cable partial discharge detection field, especially relate to a kind of special according to alternate signal correction relation
Levy and carry out shelf depreciation and sentence method for distinguishing.
Background technology
At present, the partial discharge detection that the equipment for power transmission and distribution etc. such as cable, GIS, transformator are carried out, the letter that detection finds
Number whether be Partial discharge signal, be typically based on the various features of Partial discharge signal, i.e. frequency f, phase place ф, density n,
Size q, time t etc., signal threephase cable being detected carries out independent analysis and judgement, and Partial discharge signal is sentenced
Disconnected foundation is:
1) f: identical signal, simultaneously appears in multiple frequency band → PD probability big；
2) phase contrast between ф: two signal groups is that 180 ° → PD probability is big；
3) n: signal pulse repetitive rate is big higher than 30 (pps) → PD probabilities per second；
4) q: signal is under identical voltage, and level is roughly the same → likely PD；
5) t: signal is long lasting for → likely PD occur.
Feature according to Partial discharge signal carries out independent judgement to each phase, when the signal detected by tested phase meet with
During upper Partial discharge signal feature, will be considered as Partial discharge signal, it is well known that test site circumstance complication, exist
Various noises, gas discharge, equipment noise, outside burst noise etc., these noises the most also can meet office and put letter
Number feature, therefore, it is very easy to noise is determined as Partial discharge signal, cause misjudgment phenomenon, simultaneously reduce system survey
The accuracy of examination.It is illustrated in figure 2 prior art office and puts judgment rule flow chart.
Three-phase independent judgment flow process be the signal that each phase is detected carrying out individually first through threshold values logical judgment,
After neutral net judges, then through comprehensive descision, the result of comprehensive descision has two kinds, i.e. Partial discharge signal or noise.
Judgement for three-phase signal is all independent individually carrying out, and judges without contrast between three-phase.
It practice, it is all association that threephase cable is put in test in the office of cable run, when wherein a phase generation office puts,
Other are biphase also can carry out, as judgment basis, the final judgement that office puts.In the prior art, only monophasic pulses is entered
Row independent judgment, from operating experience, when carrying out office and putting on-line monitoring, it may appear that false alarm, at least
Situation about reporting by mistake in short-term or unavoidable, has office put the interference signal of feature because always there will be for a long time, and this just holds
Easily cause the failing to judge of Partial discharge signal, misjudge, judge by accident, namely reduce the precision of partial discharge detecting system.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and provide a kind of accuracy rate high
Carry out shelf depreciation according to alternate signal correction relationship characteristic and sentence method for distinguishing.
The purpose of the present invention can be achieved through the following technical solutions: a kind of according to alternate signal correction relationship characteristic
Carry out shelf depreciation and sentence method for distinguishing, by a partial discharge detection instrument the most three-channel and supporting PC software
Realizing, the method comprises the following steps:
(1) gathered the pulse current letter of A, B, C three-phase by the pulses of current sensor of three same specifications simultaneously
Number and by coaxial line be transferred to partial discharge detection instrument process；
(2) signal after processing is transferred to backstage, backstage respectively the signal after processing is carried out voting logic and sentence
Disconnected and neutral net judges, draw zero level, one-level, two grades, the voting logic judged result of three grades and grade 0,
Grade 1, grade 2, the neutral net judged result of grade 3；
(3) carry out comprehensive descision according to voting logic judged result and neutral net judged result, draw without alarm,
Low Alert, middle rank alarm, the comprehensive descision result of high level alarm；
(4) it is associated judging according to the comprehensive descision result of three-phase signal, draws final result, and by PC
Output final result.
Described voting logic judges particularly as follows: to the charge value Q of signal after processing in step (2), signal
Occurrence number N and time duration T compare with setting value, draw zero level, one-level, two grades, three grades
Voting logic judged result.The concrete comparison procedure that voting logic judges is as follows: preset charge value Q, signal occurs
Frequency N, the judgment threshold of T signal duration,
(21) judge whether the charge value Q detecting signal is more than or equal to judgment threshold, if it is, perform
Step (22), is otherwise judged to zero level；
(22) judge whether frequency of occurrence value N of this signal is more than or equal to judgment threshold, if it is, hold
Row step (23), is otherwise judged to zero level；
(23) the lasting time of occurrence T of this signal is judged, if at following interval range, and export logic
Judged result:
A judges whether the persistent period is less than 1/3rd (i.e. T/3) of Preset Time.If it is, judged result is
Zero level, otherwise performs step B；
B judges whether the persistent period is less than 1/2nd (i.e. T/2) of Preset Time.If it is, judged result is
One-level, otherwise performs step C；
C judges that whether the persistent period is less than preset time T.If it is, judged result is two grades；Otherwise (the biggest
In or equal to T), output judges the highest alarm grade, three grades.
Described neutral net judges particularly as follows: the collection of illustrative plates of the signal after processing in step (2) is done neutral net
Differentiate, show that this signal collection of illustrative plates is the similarity of Partial discharge signal, similarity less than 90% for grade 0, similarity
90%～95% for grade 1, similarity 95%～98% for grade 2, similarity 98%～100% for etc.
Level 3.
The detailed process of described comprehensive descision is: the result judging described voting logic and neutral net judge
Result do alternate analysis, if voting logic sentence read result is zero level or neutral net judged result is grade 0, then
Without alarm, if neutral net judged result is grade 1 and voting logic judged result is not zero level or nerve net
Network judged result is grade 2 and voting logic judged result is one-level, then be Low Alert, if neutral net judges
Result is grade 3 and voting logic judged result is three grades, then be high level alarm, and it is alert that remaining situation is middle rank
Report.(as shown in table 1).
The detailed process that described association judges is: judge according to voting logic, neutral net judges and comprehensively sentences
Disconnected result, is associated judging, particularly as follows:
(41) when the comprehensive descision result of three-phase signal is all without alarm, then the signal detected is noise signal；
(42), in three-phase signal, have and the comprehensive descision result of only one phase is alarm, or biphase and above
Comprehensive descision result is alarm, then perform step (43)；
(43) the signal level size of three-phase is compared, biphase signal level the most both less than another letter that signal is slightly lower
The 60% of number level, if it is, the signal detected is, otherwise, it is judged that the signal detected is noise.
Collecting and research, by 15 years of present invention mass data based on cable partial discharge electro-detection on-the-spot test
Office puts test experience and field test data collects and analyzes the three-phase signal of the cable run that discovery detects
There is a following rule:
1) being contrasted by the signal detected by three-phase, less biphase signal level is all at bigger signal
When less than 60%, it is judged that bigger signal is Partial discharge signal；
2) it is more or less the same in 40% time when the three-phase signal detected, it is judged that each phase signals is noise；
3) in the three-phase signal detected the most biphase or meet office above and put feature, it is judged that each phase signals is makes an uproar
Sound.
Table 1 comprehensive descision rule
The present invention relies on following hardware system and realizes: it is main that this system includes that Partial discharge signal sensor, Partial discharge signal process
Machine, signal centralized processor MS.The various Partial discharge signal sensors being arranged in cable intermediate joint or terminal
Process main frame by coaxial cable and Partial discharge signal to be connected, Partial discharge signal process detection main frame by netting twine or optical fiber and
Signal centralized processor MS connects.
This system by high-frequency electrical pulses flow sensor (HFCT), electromagnetic wave uhf sensor (UHF),
Radio wave sensor (TEV), ultrasonic sensor (AE), paper tinsel membrane electrode sensor (FE), high-frequency pulse voltage
8 kinds of sensor detection cable terminations such as sensor (PDD), antenna (HF), noncontacting pickup (LAS),
Transition joint, the internal local discharge signal produced of GIS, the signal that Partial discharge signal sensor detects, will transmission
Processing main frame to Partial discharge signal, Partial discharge signal processes main frame and is filtered signal, amplifies, adds up, and place postpones
Signal is transferred to signal centralized processor MS mother station by optical fiber, 3G, Ethernet, serial communication, and MS is female
Stand and can carry out data analysis, display, alert management, diagnose and store.
Compared with prior art, the invention have the advantages that
(1) this method is associated by three and judges that carrying out the work of the data analysis after test is put in office is no longer necessary to artificial
Carry out numerous and diverse data post analysis work, just can be automatically analyzed by PC and discriminate whether as Partial discharge signal, this
Planting method precision higher, accuracy rate is higher, can provide higher convenience for tester；
(2) three-phase comprehensive compares, judges, according to alternate signal magnitude relation, Partial discharge signal is compared without office
Discharge signal phase signals level value is big, thus the office of judgement more accurately can put generation in which phase；
(3) occur with without Partial discharge signal phase level value magnitude relationship according to Partial discharge signal, the method can be applied
Put in differentiation to unattended station；
(4) contrast alternate signal magnitude, counter can push away the probability of noise, when in three-phase any biphase more than have office
When putting characteristic signal, can determine whether that this signal is noise, can be used to distinguish noise and Partial discharge signal.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention；
Fig. 2 is system construction drawing；
Fig. 3 is the signal collection of illustrative plates of the embodiment of the present invention 1；
Fig. 4 is the signal collection of illustrative plates of the embodiment of the present invention 2；
Fig. 5 is the signal collection of illustrative plates of the embodiment of the present invention 3.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As it is shown in figure 1, one carries out shelf depreciation according to alternate signal correction relationship characteristic sentences method for distinguishing, pass through
One partial discharge detection instrument the most three-channel and supporting PC software realize, and the method comprises the following steps:
(1) gathered the pulse current letter of A, B, C three-phase by the pulses of current sensor of three same specifications simultaneously
Number and by coaxial line be transferred to partial discharge detection instrument process；
(2) signal after processing is transferred to backstage, backstage respectively the signal after processing is carried out voting logic and sentence
Disconnected and neutral net judges, draw zero level, one-level, two grades, the voting logic judged result of three grades and grade 0,
Grade 1, grade 2, the neutral net judged result of grade 3；
Voting logic judges particularly as follows: the charge value Q of signal after processing in step (2), signal are gone out occurrence
Number N and time duration T compare with setting value, draw zero level, one-level, two grades, the threshold value of three grades patrols
Collect judged result；The concrete comparison procedure that voting logic judges is as follows: be preset with charge value Q, signal frequency of occurrence
N, the judgment threshold of T signal duration,
First, it is determined that whether the charge value Q of detection signal is more than or equal to judgment threshold, if it is, continue
Next judges, is otherwise judged to zero level；
Secondly, it is judged that whether frequency of occurrence value N of this signal is more than or equal to judgment threshold, if it is, continue
Next judgement continuous, is otherwise judged to zero level；
Finally, it is judged that the lasting time of occurrence T of this signal, if at following interval range, and export logic
Judged result:
(1) judge whether the persistent period is less than 1/3rd (i.e. T/3) of Preset Time.If it is, judge knot
Fruit is zero level, otherwise jumps into next and judges.
(2) judge whether the persistent period is less than 1/2nd (i.e. T/2) of Preset Time.If it is, judge knot
Fruit is one-level, otherwise jumps into next and judges.
(3) judge that whether the persistent period is less than preset time T.If it is, judged result is two grades；Otherwise (i.e.
More than or equal to T), the output the highest alarm grade of judgement, three grades.
Neutral net judges particularly as follows: the collection of illustrative plates of the signal after processing in step (2) is done neutral net differentiation,
Show that this signal collection of illustrative plates is the similarity of Partial discharge signal, similarity less than 90% for grade 0, similarity 90%～
95% for grade 1, similarity 95%～98% for grade 2, similarity 98%～100% for grade 3；
(3) carry out comprehensive descision according to voting logic judged result and neutral net judged result, draw without alarm,
Low Alert, middle rank alarm, the comprehensive descision result of high level alarm；
The detailed process of comprehensive descision is: the result that the result judging described voting logic and neutral net judge
Do alternate analysis, if voting logic sentence read result is zero level or neutral net judged result is grade 0, then without alarm,
If level that neutral net judged result is grade 1 and voting logic judged result is not zero or neutral net judge knot
Fruit is one-level for grade 2 and voting logic judged result, then be Low Alert, if neutral net judged result is
Level 3 and voting logic judged result are three grades, then be high level alarm, and remaining situation is middle rank alarm.(such as table
Shown in 1)；
(4) it is associated judging according to the comprehensive descision result of three-phase signal, draws final result, and by PC
Output final result；The detailed process that association judges is: judge according to voting logic, neutral net judges and combines
Close judged result, be associated judging, particularly as follows:
(41) when the comprehensive descision result of three-phase signal is all without alarm, then the signal detected is noise signal；
(42), in three-phase signal, have and the comprehensive descision result of only one phase is alarm, or biphase and above
Comprehensive descision result is alarm, then perform step (43)；
(43) the signal level size of three-phase is compared, biphase signal level the most both less than another letter that signal is slightly lower
The 60% of number level, if it is, the signal detected is, otherwise, it is judged that the signal detected is noise.
Collecting and research, by 15 years of present invention mass data based on cable partial discharge electro-detection on-the-spot test
Office puts test experience and field test data collects and analyzes the three-phase signal of the cable run that discovery detects
There is a following rule:
1) being contrasted by the signal detected by three-phase, less biphase signal level is all at bigger signal
When less than 60%, it is judged that bigger signal is Partial discharge signal；
2) it is more or less the same in 40% time when the three-phase signal detected, it is judged that each phase signals is noise；
3) in the three-phase signal detected the most biphase or meet office above and put feature, it is judged that each phase signals is makes an uproar
Sound.
Table 1 comprehensive descision rule
The present invention relies on hardware system as shown in Figure 2 and realizes: this system includes that letter is put in Partial discharge signal sensor, office
Number process main frame, signal centralized processor MS.Letter is put in the various offices being arranged in cable intermediate joint or terminal
Number sensor processes main frame by coaxial cable with Partial discharge signal and is connected, and Partial discharge signal process detects main frame and passes through netting twine
Or optical fiber is connected with signal centralized processor MS.
This system by high-frequency electrical pulses flow sensor (HFCT), electromagnetic wave uhf sensor (UHF),
Radio wave sensor (TEV), ultrasonic sensor (AE), paper tinsel membrane electrode sensor (FE), high-frequency pulse voltage
8 kinds of sensor detection cable terminations such as sensor (PDD), antenna (HF), noncontacting pickup (LAS),
Transition joint, the internal local discharge signal produced of GIS, the signal that Partial discharge signal sensor detects, will transmission
Processing main frame to Partial discharge signal, Partial discharge signal processes main frame and is filtered signal, amplifies, adds up, and place postpones
Signal is transferred to signal centralized processor MS mother station by optical fiber, 3G, Ethernet, serial communication, and MS is female
Stand and can carry out data analysis, display, alert management, diagnose and store.
Based on said method and system, after the present embodiment acquires three-phase pulse current signal and processes, first,
Three-phase is carried out independent judgment, is judged by threshold values logical judgment and neutral net, and judge rule according to comprehensive alarm
Then, comprehensive descision result is A phase alarm, and B phase is without alarm, and C phase is without alarm, secondly, according to the alarm of each phase
Situation carries out three and is associated judgement, and the result that association judges is to have in three-phase and only one phase has alarm, and compares three
The signal level of phase, do not have the biphase signal level of alarm all alarm that signal level less than 60%,
Judging that this signal is Partial discharge signal, signal collection of illustrative plates is as shown in Figure 3.
Embodiment 2
First, three-phase is carried out independent judgment, judged by threshold values logical judgment and neutral net, and according to comprehensively
Judgment rule, comprehensive descision result be A phase without alarm, secondly B phase is without alarm, and C phase is without alarm, according to respectively
The alarm condition of phase carries out three and is associated judgement, and the result that association judges is all without alarm, the letter detected in three-phase
Number being noise, signal collection of illustrative plates is as shown in Figure 4.Remaining is with embodiment 1.
Embodiment 3
First, three-phase is carried out independent judgment, judged by threshold values logical judgment and neutral net, and according to comprehensively
Judgment rule, comprehensive descision result is A phase alarm, B phase alarm, C phase alarm, secondly, according to the police of each phase
Report situation carries out three and is associated judgement, and the result that association judges is any in three-phase biphase above to have alarm, and compares
The signal level size of three-phase, the 60% of biphase signal level the most both less than another signal level that signal is slightly lower,
The signal detected is Partial discharge signal, and signal collection of illustrative plates is as shown in Figure 5.Remaining is with embodiment 1.
Claims (5)
1. one kind carries out shelf depreciation according to alternate signal correction relationship characteristic and sentences method for distinguishing, it is characterised in that
Comprise the following steps:
(1) gather the pulsed current signal of A, B, C three-phase and be transferred at partial discharge detection instrument by coaxial line
Reason；
(2) respectively the signal after processing is carried out voting logic judgement and neutral net to judge, draw zero level, one
Level, two grades, the voting logic judged result of three grades and grade 0, grade 1, grade 2, the nerve net of grade 3
Network judged result；
(3) carry out comprehensive descision according to voting logic judged result and neutral net judged result, draw without alarm,
Low Alert, middle rank alarm, the comprehensive descision result of high level alarm；
(4) it is associated judging according to the comprehensive descision result of three-phase signal, draws final result.
One the most according to claim 1 carries out shelf depreciation differentiation according to alternate signal correction relationship characteristic
Method, it is characterised in that described voting logic judges particularly as follows: to the signal after processing in step (2)
Charge value Q, signal occurrence number N and time duration T compare with setting value, draw zero level, one
Level, two grades, the voting logic judged result of three grades.
One the most according to claim 1 carries out shelf depreciation differentiation according to alternate signal correction relationship characteristic
Method, it is characterised in that described neutral net judges particularly as follows: to the signal after processing in step (2)
Collection of illustrative plates do neutral net differentiate, show that this signal collection of illustrative plates is the similarity of Partial discharge signal, similarity less than 90%
For grade 0, similarity 90%～95% for grade 1, similarity 95%～98% for grade 2, similarity
98%～100% for grade 3.
One the most according to claim 1 carries out shelf depreciation differentiation according to alternate signal correction relationship characteristic
Method, it is characterised in that the detailed process of comprehensive descision is: the result judging described voting logic and god
The result judged through network does alternate analysis, if voting logic sentence read result is zero level or neutral net judged result is
Grade 0, then without alarm, if neutral net judged result is grade 1 and voting logic judged result is not zero level or
Person's neutral net judged result is grade 2 and voting logic judged result is one-level, then be Low Alert, if neural
Network judged result is grade 3 and voting logic judged result is three grades, then be high level alarm, and remaining situation is
Middle rank alarm.
One the most according to claim 3 carries out shelf depreciation differentiation according to alternate signal correction relationship characteristic
Method, it is characterised in that the detailed process that described association judges is: judge according to voting logic, nerve net
Network judges and comprehensive descision result, is associated judging, particularly as follows:
(41) when the comprehensive descision result of three-phase signal is all without alarm, then the signal detected is noise signal；
(42), in three-phase signal, have and the comprehensive descision result of only one phase is alarm, or biphase and above
Comprehensive descision result is alarm, then perform step (43)；
(43) the signal level size of three-phase is compared, biphase signal level the most both less than another letter that signal is slightly lower
The 60% of number level, if it is, the signal detected is, otherwise, it is judged that the signal detected is noise.
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| CN113238128A (en) * | 2021-05-11 | 2021-08-10 | 广州智丰电气科技有限公司 | Circulating progressive partial discharge discrimination method |
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