CN109406964A - A kind of cable system partial discharge positioning method of more cut cables - Google Patents
A kind of cable system partial discharge positioning method of more cut cables Download PDFInfo
- Publication number
- CN109406964A CN109406964A CN201811368071.1A CN201811368071A CN109406964A CN 109406964 A CN109406964 A CN 109406964A CN 201811368071 A CN201811368071 A CN 201811368071A CN 109406964 A CN109406964 A CN 109406964A
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- Prior art keywords
- shelf depreciation
- cable
- section
- partial discharge
- connector
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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 present invention provides a kind of cable system partial discharge positioning methods of more cut cables, include the following steps: step (1): acquiring each connector shelf depreciation current signal of the cable；Step (2): the shelf depreciation current signal is filtered；Step (3): A/D conversion is carried out to the shelf depreciation current signal；Step (4): wavelet transformation is carried out to the shelf depreciation current signal, obtains the 9th decomposition level energy eigenvalue of wavelet transformation；Step (5): all connector energy eigenvalues of the cable are compared judgement, determine partial discharge position.The present invention provides a kind of cable system partial discharge positioning method of more cut cables, judges partial discharge position according to shelf depreciation energy eigenvalue, improves the reliability and safety of power supply and distribution.
Description
Technical field
The invention belongs to Partial Discharge Detecting Technology field, in particular to a kind of cable system shelf depreciation of more cut cables
Localization method.
Background technique
With the continuous development of science and technology, power technology is also being constantly progressive, and demand of the people to electric energy is also higher and higher.Electricity
Important component of the cable as electric system is more and more paid close attention to by people.
Raising due to people to electrical energy demands, the security and stability of electric system are the important factors for guaranteeing power quality
One of.The main reason for insulation performance of cable is generation failure, is the key factor for causing power grid accident, it is therefore desirable to electricity
The insulation status of cable is effectively detected.The present invention proposes a kind of cable system partial discharge positioning method, being capable of positioning cable
Network partial discharge position, and the different situations of single or double defective cable section are distinguished, and then improve the reliability and peace of power supply and distribution
Quan Xing.
Summary of the invention
The present invention provides a kind of cable system partial discharge positioning method of more cut cables, according to shelf depreciation energy feature
Value judges partial discharge position, improves the reliability and safety of power supply and distribution.
The present invention provides a kind of cable system partial discharge positioning method of more cut cables, the partial discharge positioning method
Include the following steps:
Step (1): each connector shelf depreciation current signal of cable is acquired using current sensor；
Step (2): the shelf depreciation current signal is filtered；
Step (3): A/D conversion is carried out to the shelf depreciation current signal；
Step (4): wavelet transformation is carried out using db7 morther wavelet to the shelf depreciation current signal, obtains wavelet transformation
9th decomposition level energy eigenvalueN is data sampling sum, D9kFor the shelf depreciation current signal
The 9th component after wavelet transformation；
Step (5): all connector energy eigenvalues of the cable are compared judgement, determine partial discharge position.
All connector energy eigenvalues of the cable are compared judgement in the step (5), determine shelf depreciation position
It sets, specifically includes following content:
If there are maximum values for the energy eigenvalue in the joint that two pairs separate, it is located at connector Mi、Mi+1And Mj、Mj+1Place,
Then i-th section of the cable and jth section are shelf depreciation section；
If there are maximum values for the energy eigenvalue two pairs of adjacent joints, it is located at connector Mi、Mi+1、Mi+2、Mi+3
Place, then i-th section and the i-th+2 sections of the cable is shelf depreciation section；
If only there are maximum values for the energy eigenvalue 3 adjacent joints, it is located at connector Mi、Mi+1、Mi+2Place, then
I-th section of the cable and i+1 section are shelf depreciation section；
If only there are maximum values for the energy eigenvalue 1 pair of adjacent joint, it is located at connector Mi、Mi+1, then the electricity
I-th section of cable is shelf depreciation section.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the cable system partial discharge positioning method of more cut cables of the present invention.
Specific embodiment
With reference to the accompanying drawing to a kind of specific implementation of the cable system partial discharge positioning method of more cut cables of the present invention
Mode elaborates.
As shown in Figure 1, the present invention provides a kind of cable system partial discharge positioning method of more cut cables, the part is put
Electric localization method includes the following steps:
Step (1): each connector shelf depreciation current signal of cable is acquired using current sensor；
Step (2): the shelf depreciation current signal is filtered；
Step (3): A/D conversion is carried out to the shelf depreciation current signal；
Step (4): wavelet transformation is carried out using db7 morther wavelet to the shelf depreciation current signal, obtains wavelet transformation
9th decomposition level energy eigenvalueN is data sampling sum, D9kFor the shelf depreciation current signal
The 9th component after wavelet transformation；
Step (5): all connector energy eigenvalues of the cable are compared judgement, determine partial discharge position.
All connector energy eigenvalues of the cable are compared judgement in the step (5), determine shelf depreciation position
It sets, specifically includes following content:
If there are maximum values for the energy eigenvalue in the joint that two pairs separate, it is located at connector Mi、Mi+1And Mj、Mj+1Place,
Then i-th section of the cable and jth section are shelf depreciation section；
If there are maximum values for the energy eigenvalue two pairs of adjacent joints, it is located at connector Mi、Mi+1、Mi+2、Mi+3
Place, then i-th section and the i-th+2 sections of the cable is shelf depreciation section；
If only there are maximum values for the energy eigenvalue 3 adjacent joints, it is located at connector Mi、Mi+1、Mi+2Place, then
I-th section of the cable and i+1 section are shelf depreciation section；
If only there are maximum values for the energy eigenvalue 1 pair of adjacent joint, it is located at connector Mi、Mi+1, then the electricity
I-th section of cable is shelf depreciation section.
Finally it should be noted that only illustrating technical solution of the present invention rather than its limitations in conjunction with above-described embodiment.Institute
The those of ordinary skill in category field is it is to be understood that those skilled in the art can repair a specific embodiment of the invention
Change or equivalent replacement, but these modifications or change are being applied among pending claims.
Claims (2)
1. a kind of cable system partial discharge positioning method of more cut cables, which is characterized in that the partial discharge positioning method
Include the following steps:
Step (1): each connector shelf depreciation current signal of cable is acquired using current sensor；
Step (2): the shelf depreciation current signal is filtered；
Step (3): A/D conversion is carried out to the shelf depreciation current signal；
Step (4): wavelet transformation is carried out using db7 morther wavelet to the shelf depreciation current signal, obtains wavelet transformation the 9th
Decomposition level energy eigenvalueN is data sampling sum, D9kFor shelf depreciation current signal process
9th component after wavelet transformation；
Step (5): all connector energy eigenvalues of the cable are compared judgement, determine partial discharge position.
2. a kind of cable system partial discharge positioning method of more cut cables according to claim 1, which is characterized in that institute
It states in step (5) and all connector energy eigenvalues of the cable is compared judgement, determine partial discharge position, specifically include
Following content:
If there are maximum values for the energy eigenvalue in the joint that two pairs separate, it is located at connector Mi、Mi+1And Mj、Mj+1Locate, then institute
It states i-th section of cable and jth section is shelf depreciation section；
If there are maximum values for the energy eigenvalue two pairs of adjacent joints, it is located at connector Mi、Mi+1、Mi+2、Mi+3Locate, then institute
I-th section and the i-th+2 sections of cable is stated as shelf depreciation section；
If only there are maximum values for the energy eigenvalue 3 adjacent joints, it is located at connector Mi、Mi+1、Mi+2Place, then it is described
I-th section of cable and i+1 section are shelf depreciation section；
If only there are maximum values for the energy eigenvalue 1 pair of adjacent joint, it is located at connector Mi、Mi+1, then the cable i-th
Section is shelf depreciation section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811368071.1A CN109406964A (en) | 2018-11-16 | 2018-11-16 | A kind of cable system partial discharge positioning method of more cut cables |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811368071.1A CN109406964A (en) | 2018-11-16 | 2018-11-16 | A kind of cable system partial discharge positioning method of more cut cables |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109406964A true CN109406964A (en) | 2019-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811368071.1A Pending CN109406964A (en) | 2018-11-16 | 2018-11-16 | A kind of cable system partial discharge positioning method of more cut cables |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113835005A (en) * | 2021-09-15 | 2021-12-24 | 国网江苏省电力有限公司盐城供电分公司 | Method for detecting partial discharge fault of internal power distribution equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113835005A (en) * | 2021-09-15 | 2021-12-24 | 国网江苏省电力有限公司盐城供电分公司 | Method for detecting partial discharge fault of internal power distribution equipment |
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Application publication date: 20190301 |