CN116593840A - Method for detecting discharge faults of power transmission and distribution cable based on historical data - Google Patents
Method for detecting discharge faults of power transmission and distribution cable based on historical data Download PDFInfo
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- CN116593840A CN116593840A CN202310550819.4A CN202310550819A CN116593840A CN 116593840 A CN116593840 A CN 116593840A CN 202310550819 A CN202310550819 A CN 202310550819A CN 116593840 A CN116593840 A CN 116593840A
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- discharge
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- quantization factor
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000002159 abnormal effect Effects 0.000 claims abstract description 13
- 230000005856 abnormality Effects 0.000 claims abstract description 8
- 238000013139 quantization Methods 0.000 claims description 48
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention provides a method for detecting discharge faults of power transmission and distribution cables based on historical data, which comprises the following steps: (1): collecting a current signal and a discharge current signal of a power transmission and distribution cable; (2): carrying out preliminary judgment on the power transmission and distribution cable according to the current signal, and entering (3) if abnormality exists; if no abnormality exists, returning to the step (1); (3): judging whether the discharge current is larger than a discharge current reference value, if so, entering (4); if not, returning to (1); (4): performing abnormal timing; (5): judging whether the discharge current is larger than a discharge current reference value, if so, stopping timing, and entering (6); if not, return (4); (6): the fault condition is determined by the discharge current signal and the discharge duration. The invention provides a method for detecting discharge faults of an electric transmission and distribution cable based on historical data, which can accurately judge the discharge faults of the electric transmission and distribution cable and judge fault conditions so as to perform timely and effective fault treatment.
Description
Technical Field
The invention belongs to the technical field of power detection, and particularly relates to a power transmission and distribution cable discharge fault detection method based on historical data.
Background
The transmission and distribution cable is used as an important carrier for electric energy transmission of an electric power system, so that the safety and reliability of the operation of the transmission and distribution cable are required to be ensured, and further the transmission and distribution faults and the waste of electric energy are prevented, but the transmission and distribution cable is required to be monitored according to different conditions due to the complex diversity of the working environment of the transmission and distribution cable, the aging caused by long-term operation and the like. The discharge fault is a multiple fault of cable faults, causes of faults are diversified, and if the faults can be rapidly and accurately found, further timely and effective fault processing is performed, so that the discharge fault is an important guarantee for guaranteeing safety and reliability of a power transmission and distribution system.
The invention provides a method for detecting discharge faults of an electric transmission cable based on historical data, which is characterized in that current signals and discharge current signals are respectively collected, preliminary judgment is carried out according to the current signals, the discharge current signals are analyzed, proper reference values are selected according to historical fault information, and characteristic information is determined by combining with discharge current amplitude and duration, so that the degree of the discharge faults is accurately judged and classified, and more effective and economical fault treatment is adopted.
Disclosure of Invention
The invention provides a method for detecting discharge faults of an electric transmission and distribution cable based on historical data, which can accurately judge the discharge faults of the electric transmission and distribution cable and judge fault conditions so as to perform timely and effective fault treatment.
The invention particularly relates to a method for detecting discharge faults of power transmission and distribution cables based on historical data, which comprises the following steps:
step (1): collecting the current signals of the power transmission and distribution cable and the discharge current signals;
step (2): carrying out preliminary judgment on the power transmission and distribution cable according to the current signal, and if abnormality exists, entering a step (3); if no abnormality exists, returning to the step (1);
step (3): judging whether the discharge current is larger than a discharge current reference value, if so, entering a step (4); if not, returning to the step (1);
step (4): performing abnormal timing;
step (5): judging whether the discharge current is larger than the discharge current reference value, if so, stopping timing, and entering a step (6); if not, returning to the step (4);
step (6): and judging the fault condition through the discharge current signal and the discharge duration.
In the step (1), a current sensor is adopted to collect the current signal, and a discharge current sensor is adopted to collect the discharge current signal.
The specific method for primarily judging the power transmission and distribution cable according to the current signal comprises the following steps:
judging whether the current signal is in a current reference range, if so, the transmission and distribution cable is not abnormal; if not, the transmission and distribution cable is abnormal, and the step (3) is carried out for further analysis.
The specific method for judging the fault condition according to the discharge current signal and the discharge duration in the step (6) is as follows:
(61) Calculating the discharge current signal quantization factor;
(62) And determining the fault degree according to the discharge current signal quantization factor.
The specific algorithm for calculating the discharge current signal quantization factor in the step (61) is as follows:
wherein a and b are continuous starting amplitude values and ending amplitude values of the discharge current signals, and T is the duration time of the corresponding discharge current signals.
The specific method for determining the fault degree according to the discharge current signal quantization factor in the step (62) is as follows:
judging whether the discharge current signal quantization factor is larger than a first quantization factor reference value, if so, the discharge of the power transmission and distribution cable is serious;
if not, judging whether the discharge current signal quantization factor is larger than a second quantization factor reference value, and if so, slightly discharging the power transmission and distribution cable.
The method for acquiring the first quantization factor reference value and the second quantization factor reference value comprises the following steps:
and acquiring the discharge current amplitude of the slight discharge fault of the power transmission and distribution cable, the discharge current amplitude of the severe discharge fault and the abnormal duration according to historical data, and further calculating a quantization factor in the severe discharge fault and a quantization factor in the micro discharge fault, wherein the quantization factor and the quantization factor are respectively used as the first quantization factor reference value and the second quantization factor reference value.
Compared with the prior art, the beneficial effects are that: the power transmission and distribution cable discharge fault detection method is characterized in that current signals and discharge current signals are respectively collected, preliminary judgment is carried out according to the current signals, the discharge current signals are analyzed, a proper reference value is selected according to historical fault information, characteristic information is determined by combining the discharge current amplitude and duration, and further the discharge fault degree is accurately judged, so that the safety and stability of a power transmission and distribution system are further ensured.
Drawings
Fig. 1 is a flowchart of a method for detecting discharge faults of an electric transmission and distribution cable based on historical data.
Detailed Description
The following describes a specific embodiment of a method for detecting discharge faults of an electric transmission and distribution cable based on historical data in detail with reference to the accompanying drawings.
As shown in fig. 1, the method for detecting discharge faults of the power transmission and distribution cable of the present invention comprises the following steps:
step (1): collecting the current signals of the power transmission and distribution cable and the discharge current signals;
step (2): carrying out preliminary judgment on the power transmission and distribution cable according to the current signal, and if abnormality exists, entering a step (3); if no abnormality exists, returning to the step (1);
step (3): judging whether the discharge current is larger than a discharge current reference value, if so, entering a step (4); if not, returning to the step (1);
step (4): performing abnormal timing;
step (5): judging whether the discharge current is larger than the discharge current reference value, if so, stopping timing, and entering a step (6); if not, returning to the step (4);
step (6): and judging the fault condition through the discharge current signal and the discharge duration.
Collecting the current signal by adopting a current sensor in the step (1); and collecting the discharge current signals by adopting a discharge current sensor, wherein the discharge current sensor is sleeved on each grounding wire of the power transmission and distribution cable.
The specific method for primarily judging the power transmission and distribution cable according to the current signal comprises the following steps:
judging whether the current signal is in a current reference range, if so, the transmission and distribution cable is not abnormal; if not, the transmission and distribution cable is abnormal, and the step (3) is carried out for further analysis.
The specific method for judging the fault condition according to the discharge current signal and the discharge duration in the step (6) is as follows:
(61) Calculating the discharge current signal quantization factor:wherein a and b are continuous starting amplitude values and ending amplitude values of the discharge current signals, and T is the duration time of the corresponding discharge current signals; successive ones of said discharge current signals i e (a, b);
(62) Determining a fault degree according to the discharge current signal quantization factor:
judging whether the discharge current signal quantization factor is larger than a first quantization factor reference value, if so, the discharge of the power transmission and distribution cable is serious;
if not, judging whether the discharge current signal quantization factor is larger than a second quantization factor reference value, and if so, slightly discharging the power transmission and distribution cable.
The method for acquiring the first quantization factor reference value and the second quantization factor reference value comprises the following steps:
and acquiring the discharge current amplitude of the slight discharge fault of the power transmission and distribution cable, the discharge current amplitude of the severe discharge fault and the abnormal duration according to historical data, and further calculating a quantization factor in the severe discharge fault and a quantization factor in the micro discharge fault, wherein the quantization factor and the quantization factor are respectively used as the first quantization factor reference value and the second quantization factor reference value.
In order to obtain the more accurate first quantization factor reference value and the second quantization factor reference value, the quantization factor when the transmission and distribution cable is subjected to the last 5 times of severe discharge faults and the quantization factor average value when the transmission and distribution cable is subjected to micro discharge faults are taken as reference values.
Finally, it should be noted that the above-mentioned embodiments are merely illustrative of the technical solution of the invention and not limiting thereof. It will be understood by those skilled in the art that modifications and equivalents may be made to the particular embodiments of the invention, which are within the scope of the claims appended hereto.
Claims (7)
1. The method for detecting the discharge faults of the power transmission and distribution cables based on the historical data is characterized by comprising the following steps of:
step (1): collecting the current signals of the power transmission and distribution cable and the discharge current signals;
step (2): carrying out preliminary judgment on the power transmission and distribution cable according to the current signal, and if abnormality exists, entering a step (3); if no abnormality exists, returning to the step (1);
step (3): judging whether the discharge current is larger than a discharge current reference value, if so, entering a step (4); if not, returning to the step (1);
step (4): performing abnormal timing;
step (5): judging whether the discharge current is larger than the discharge current reference value, if so, stopping timing, and entering a step (6); if not, returning to the step (4);
step (6): and judging the fault condition through the discharge current signal and the discharge duration.
2. The method for detecting discharge faults of power transmission and distribution cables based on historical data as claimed in claim 1, wherein in the step (1), a current sensor is adopted to collect the current signal, and a discharge current sensor is adopted to collect the discharge current signal.
3. The method for detecting discharge faults of power transmission and distribution cables based on historical data as claimed in claim 2, wherein the specific method for primarily judging the power transmission and distribution cables according to the current signals is as follows: judging whether the current signal is in a current reference range, if so, the transmission and distribution cable is not abnormal; if not, the transmission and distribution cable is abnormal, and the step (3) is carried out for further analysis.
4. A method for detecting a discharge fault in an electrical transmission and distribution cable based on historical data as claimed in claim 3, wherein the specific method for determining the fault condition in step (6) by the discharge current signal and the discharge duration is as follows:
(61) Calculating the discharge current signal quantization factor;
(62) And determining the fault degree according to the discharge current signal quantization factor.
5. The method for detecting discharge faults in power transmission and distribution cables based on historical data as claimed in claim 4, wherein the specific algorithm for calculating the discharge current signal quantisation factor in step (61) is:wherein a and b are continuous starting amplitude values and ending amplitude values of the discharge current signals, and T is the duration time of the corresponding discharge current signals.
6. The method for detecting discharge faults in power transmission and distribution cables based on historical data as claimed in claim 5, wherein the specific method for determining the fault level in step (62) according to the discharge current signal quantisation factor is as follows:
judging whether the discharge current signal quantization factor is larger than a first quantization factor reference value, if so, the discharge of the power transmission and distribution cable is serious;
if not, judging whether the discharge current signal quantization factor is larger than a second quantization factor reference value, and if so, slightly discharging the power transmission and distribution cable.
7. The method for detecting discharge faults of power transmission and distribution cables based on historical data as claimed in claim 6, wherein the method for obtaining the first quantization factor reference value and the second quantization factor reference value is as follows: and acquiring the discharge current amplitude of the slight discharge fault of the power transmission and distribution cable, the discharge current amplitude of the severe discharge fault and the abnormal duration according to historical data, and further calculating a quantization factor in the severe discharge fault and a quantization factor in the micro discharge fault, wherein the quantization factor and the quantization factor are respectively used as the first quantization factor reference value and the second quantization factor reference value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310550819.4A CN116593840A (en) | 2023-05-16 | 2023-05-16 | Method for detecting discharge faults of power transmission and distribution cable based on historical data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310550819.4A CN116593840A (en) | 2023-05-16 | 2023-05-16 | Method for detecting discharge faults of power transmission and distribution cable based on historical data |
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| Publication Number | Publication Date |
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| CN116593840A true CN116593840A (en) | 2023-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310550819.4A Pending CN116593840A (en) | 2023-05-16 | 2023-05-16 | Method for detecting discharge faults of power transmission and distribution cable based on historical data |
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| CN (1) | CN116593840A (en) |
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2023
- 2023-05-16 CN CN202310550819.4A patent/CN116593840A/en active Pending
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