CN105426649B - A kind of separation computational methods of Leakage Current - Google Patents
A kind of separation computational methods of Leakage Current Download PDFInfo
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- CN105426649B CN105426649B CN201410477086.7A CN201410477086A CN105426649B CN 105426649 B CN105426649 B CN 105426649B CN 201410477086 A CN201410477086 A CN 201410477086A CN 105426649 B CN105426649 B CN 105426649B
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- 238000000205 computational method Methods 0.000 title claims abstract description 12
- 238000000926 separation method Methods 0.000 title claims abstract description 12
- 108010076504 Protein Sorting Signals Proteins 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000000737 periodic effect Effects 0.000 claims abstract description 20
- 238000009413 insulation Methods 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims description 8
- 230000003595 spectral effect Effects 0.000 claims description 5
- 230000011664 signaling Effects 0.000 claims description 3
- 238000009499 grossing Methods 0.000 claims description 2
- 238000000691 measurement method Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 description 5
- 238000009422 external insulation Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a kind of separation computational methods of Leakage Current, comprise the following steps：Step 1：The ac leakage current signal of insulation is obtained with particular element；Step 2：Secondary signal sequence is obtained by the first formulating method；Step 3：Secondary signal sequence is calculated by the second designation method, obtains the 3rd signal sequence；Step 4：4th signal sequence is obtained by the ac leakage current signal of insulation and the difference of the 3rd signal sequence；4th signal sequence is judged, obtains the 5th signal sequence, then the 5th signal sequence is steep-sided pulse component；Step 5：The ac leakage current signal of insulation and the difference of the 5th signal sequence are periodic component.The steep-sided pulse and periodic component in ac leakage current can be efficiently separated using the computational methods, and the applicable ability of computational methods is strong.
Description
Technical field
The present invention relates to power transmission control field, the separation computational methods of particularly a kind of Leakage Current.
Background technology
Contain periodic component in the ac leakage current of insulation, also often include very steep pulse component, the two contains body
The information of existing insulation status, has a variety of insulation analysis based on leakage current to need to divide periodic component and pulse component
Analysis, if the two can not be precisely separating, the effect of the external insulation analysis based on leakage current will be influenceed.Digital filtering
The separation to cyclical component and pulse component can be realized with non-filtered mode.Filtering method is by filtering out pulse component so as to obtaining
Cyclical component is obtained, principle simple realization is easy, can reach preferable when this method does not have frequency overlapping two parts to be separated
Effect.But the spectrum distribution of pulse component is very extensive, and cyclical component is also made up of multiple harmonic, and the side based on filtering
Formula, the method for being based especially on frequency domain are only capable of obtaining the cyclical component of signal in a certain frequency range as analysis gained, so
Part periodic component is necessarily given up in the cyclical component of gained, while has remained partial pulse component again, in certain journey
The effect of separation is influenceed on degree.Rather than filtering mode has the letter for then using no pulse by whether having pulse in threshold decision electric current
Number replace.This method principle is simple, it is easy to realize, periodic component is periodically strong in the signal and pulse component and periodic component area
There is good effect when unobvious.But existing pulsed discharge amplitude varies in practice, when there is the pulse compared with small magnitude
Electric discharge occurs at the non-peak area of electric current, judges that electric discharge whether occurs in the cycle there is according to the maximum amplitude of signal
Certain difficulty, especially to realize that then difficulty is bigger for automatic threshold.Therefore, periodic component and steep-sided pulse point in insulated leakage current
The separation of amount is up for further research.Contain periodic component in the ac leakage current of insulation, also often include very steep pulse
Component, the two containing the information for embodying insulation status, has a variety of insulation analysis based on leakage current to need to periodic component
Analyzed with pulse component, if the two can not be precisely separating, the external insulation based on leakage current point will be influenceed
The effect of analysis.
The content of the invention
The deficiency that can only be filtered for the existing filtering method mentioned in above-mentioned background technology to band segment, the present invention carry
A kind of leakage current separation computational methods are gone out.
To reach above-mentioned purpose, the present invention comprises the following steps：
Step 1：The ac leakage current signal of insulation is obtained with particular element；
Step 2：The ac leakage current signal of insulation is carried out with setting the spectral window of length by the first designation method
Filtering obtains the first signal sequence；And with first designation method to set the spectral window of length half to the first signal sequence again
Once filter, obtain secondary signal sequence；
Step 3：Secondary signal sequence is calculated by the second designation method, obtains the 3rd signal sequence；
Step 4：4th signal sequence is obtained by the ac leakage current signal of insulation and the difference of the 3rd signal sequence；
4th signal sequence is judged, obtains the 5th signal sequence, then the 5th signal sequence is steep-sided pulse component；
Step 5：The ac leakage current signal of insulation and the difference of the 5th signal sequence are periodic component.
The specified element is noninductive resistance or Rogowski coil.
First designation method is calculated by 53H algorithms.
Second designation method is smoothing filter mensuration.
The formula that is calculated by the second designation method secondary signal sequence is：
S3 (i)=0.25S2 (i-1)+0.5S2 (i)+0.25S2 (i+1)
2≤i≤N-1S3 (i)=S2 (i) i=1, N
Wherein：
S3 (i) is the 3rd signal sequence；
S2 (i) is secondary signal sequence；
I is the sequence number of signal sequence；
N is leakage current signal total length.
Described that 4th signal sequence is judged, the process for obtaining the 5th signal sequence is：
Step 4.1：Obtain the array a that amplitude in the 4th signal sequence is the positional information composition corresponding to 0 signaling point
(i), i=1,2 ..., L, L are the number that signal amplitude is 0；
Step 4.2：If the maximum of the absolute value of the sequences of pulsed signals between a (i) and a (i+1) is more than or equal to setting
Threshold value, this maximum is steep-sided pulse, then retains this section of pulse signal；Otherwise steep-sided pulse is not belonging to, respective pulses signal is set to 0.
Advantages of the present invention has：Advantages of the present invention has：
(1) steep-sided pulse and periodic component in ac leakage current can be efficiently separated
Because steep-sided pulse is catastrophe point, the present invention can effectively identify catastrophe point by 53H algorithms, and consider pulse
Feature, using based on Adaptive Thresholding, real steep discharge pulse is effectively have identified, steep-sided pulse and periodic component obtain
Efficiently separate.
(2) it is strong to be applicable ability
Because 53H algorithms can effectively find catastrophe point, no matter the amplitude of pulse is big or small, and discharge position is at peak
Still on smaller value, the present invention can separate steep-sided pulse component very well with periodic component value.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention；
Fig. 2 is experimental principle figure.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the invention will be further described, the illustrative examples invented herein
And explanation is used for explaining the present invention, but it is not as a limitation of the invention.
With reference to shown in Fig. 1 Fig. 2, the technical scheme is that comprising the following steps：
Step 1：The ac leakage current signal of insulation is obtained with noninductive resistance or Rogowski coil, is designated as S；
Step 2：The signal of Leakage Current is filtered by 53H algorithms, obtains signal S1；
Step 3：S2=S-S1, processing is carried out to S2 and obtains discharge pulse component, is designated as S3；
Step 4：S4=S-S3, S4 are isolated periodic component；
Step 5：The ac leakage current signal of insulation and the difference of the 5th signal sequence are periodic component.
Wherein, 53H algorithms, 2 spectral window adjustable lengths, are not fixed as 5 and 3.Arteries and veins is assumed when handling S2
Punching is since zero crossing, and then amplitude increases to after peak value and reduced again through zero crossing, according to the pulse that this acquisition is independent.Electric discharge
Pulse amplitude thinks that the pulse is steep discharge pulse when being more than critical value Ipc.Critical value Ipc is one and exchanges leakage with what is insulated
The directly proportional amount of the average of the amplitude of current signal.
The formula that is calculated by the second designation method secondary signal sequence is：
S3 (i)=0.25S2 (i-1)+0.5S2 (i)+0.25S2 (i+1)
2≤i≤N-1S3 (i)=S2 (i) i=1, N
Wherein：
S3 (i) is the 3rd signal sequence；
S2 (i) is secondary signal sequence；
I is the sequence number of signal sequence；
N is leakage current signal total length.
Described that 4th signal sequence is judged, the process for obtaining the 5th signal sequence is：
Step 4.1：Obtain the array a that amplitude in the 4th signal sequence is the positional information composition corresponding to 0 signaling point
(i), i=1,2 ..., L, L are the number that signal amplitude is 0；
Step 4.2：If the maximum of the absolute value of the sequences of pulsed signals between a (i) and a (i+1) is more than or equal to setting
Threshold value, this maximum is steep-sided pulse, then retains this section of pulse signal；Otherwise steep-sided pulse is not belonging to, respective pulses signal is set to 0.
By above computational methods, the steep-sided pulse and periodic component in ac leakage current can be efficiently separated.Due to rake vein
Punching is catastrophe point, and the present invention can effectively identify catastrophe point by 53H algorithms, and consider the feature of pulse, using based on certainly
Threshold method is adapted to, effectively have identified real steep discharge pulse, therefore, steep-sided pulse and periodic component are efficiently separated.
And the applicable ability of this method is strong.Because 53H algorithms can effectively find catastrophe point, no matter the amplitude of pulse is big or small, is put
Electric position is in peak value or on smaller value, and the present invention can separate steep-sided pulse component very well with periodic component.
Technical scheme is not limited to the limitation of above-mentioned specific embodiment, and every technique according to the invention scheme is done
The technology deformation gone out, each falls within protection scope of the present invention.
Claims (4)
- A kind of 1. separation computational methods of Leakage Current, it is characterized in that this method comprises the following steps：Step 1：The ac leakage current signal of insulation is obtained with electric current signal collecting element；Step 2：It is filtered to obtain to set the spectral window of length to the ac leakage current signal of insulation by 53H algorithms One signal sequence；And the first signal sequence is filtered again with setting the spectral window of length half with 53H algorithms, obtain second Signal sequence；Step 3：Secondary signal sequence is calculated by filter measurement method, obtains the 3rd signal sequence；Step 4：4th signal sequence is obtained by the ac leakage current signal of insulation and the difference of the 3rd signal sequence；To Four signal sequences are judged, obtain the 5th signal sequence, and deterministic process is：Step 4.1：Obtain the array a (i), i that amplitude in the 4th signal sequence is the positional information composition corresponding to 0 signaling point =1,2 ..., L, L are the number that signal amplitude is 0；Step 4.2：If the maximum of the absolute value of the sequences of pulsed signals between a (i) and a (i+1) is more than or equal to the threshold of setting Value, this maximum is steep-sided pulse, then retains this section of pulse signal；Otherwise steep-sided pulse is not belonging to, respective pulses signal is set to 0, then and Five signal sequences are steep-sided pulse component；Step 5：The ac leakage current signal of insulation and the difference of the 5th signal sequence are periodic component.
- 2. a kind of separation computational methods of leakage current according to claim 1, it is characterized in that：The current signal collection Element is noninductive resistance or Rogowski coil.
- 3. a kind of separation computational methods of leakage current according to claim 1, it is characterized in that：The filter measurement method For smoothing filter mensuration.
- 4. a kind of separation computational methods of leakage current according to claim 3, it is characterized in that：It is described to pass through smothing filtering The formula that device mensuration is calculated secondary signal sequence is：S3 (i)=0.25S2 (i-1)+0.5S2 (i)+0.25S2 (i+1)；2≤i≤N-1；S3 (i)=S2 (i) i=1, N；Wherein：S3 (i) is the 3rd signal sequence；S2 (i) is secondary signal sequence；I is the sequence number of signal sequence；N is leakage current signal total length.
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2014
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