CN114236423A - Power system transmission line short-circuit fault diagnosis method - Google Patents
Power system transmission line short-circuit fault diagnosis method Download PDFInfo
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Abstract
The invention discloses a method for diagnosing short-circuit faults of a power transmission line of a power system, which comprises the following steps: s1, firstly, installing circuit detectors on each branch point of the power transmission line; s2, collecting the current signal data of the circuit detectors mounted on each branch point in real time, and preprocessing the current signal data; s3, comparing and analyzing the preprocessed current signal data with historical current data, and judging whether a short-circuit fault of the electric line occurs; and S4, determining the specific branch point of the electric line with the current short-circuit fault according to the corresponding circuit detector after determining that the electric line has the short-circuit fault. The method for diagnosing the short-circuit fault of the power transmission line of the power system can effectively monitor and record various parameters in the operation of the power distribution line. When the monitoring data is abnormal, the specific position of the fault can be calculated according to the data, the detection efficiency is higher, and the working personnel can be rapidly helped to overhaul the fault stage.
Description
Technical Field
The invention belongs to the technical field of power transmission safety of a power system, and particularly relates to a method for diagnosing a short-circuit fault of a power transmission line of the power system.
Background
On one hand, the power transmission line spans a large space distance, generally dozens of to thousands of kilometers, on the other hand, the power transmission line is exposed outdoors with severe environmental conditions for a long time and cannot be effectively maintained, and compared with other electrical elements, the condition of the power transmission line determines that the power transmission line is the most prone to faults in a power system. The most common and at the same time the most dangerous faults on a transmission line are abnormal connections between phases or phases and ground, i.e. short circuits. These faults are classified in the power system as single-phase ground short, two-phase interphase short, two-phase ground short, and three-phase ground short. Single phase ground shorts are most common, while three phase shorts are less common. When short circuit occurs, large short circuit current is generated, and meanwhile, the voltage in the system is greatly reduced. Short-circuit point short-circuit currents and thermal and mechanical effects of the short-circuit currents can directly damage electrical equipment. The voltage drop affects the normal work of the user and the product quality. The more serious consequence of a short circuit is that the voltage drop may cause the stability of the parallel operation between power plants of the power system to be destroyed, causing the system to oscillate until the whole system collapses. Therefore, the diagnosis of the short-circuit fault of the transmission line is a key point of the fault diagnosis of the power system.
At present, when a fault occurs in a power system, wavelet transformation is generally adopted to judge the fault, and the wavelet entropy is mainly used in heuristic algorithms such as a neural network or a fuzzy system to identify the fault. And generating a wavelet entropy characteristic vector through wavelet transformation and wavelet time-frequency parameters, and then identifying the fault by combining a neural network. However, in the identification mode, when the specific node with the problem of the power transmission line is judged, the speed is low, and workers need to check the nodes in sequence, so that the recovery time of the whole power transmission line after short circuit is low.
Disclosure of Invention
The invention aims to provide a method for diagnosing a short-circuit fault of a power transmission line of a power system, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for diagnosing short-circuit faults of power transmission lines of a power system comprises the following steps:
s1, firstly, installing circuit detectors on each branch point of the power transmission line;
s2, collecting the current signal data of the circuit detectors mounted on each branch point in real time, and preprocessing the current signal data;
s3, comparing and analyzing the preprocessed current signal data with historical current data, and judging whether a short-circuit fault of the electric line occurs;
and S4, determining the specific branch point of the electric line with the current short-circuit fault according to the corresponding circuit detector after determining that the electric line has the short-circuit fault.
Preferably, in S1, when the circuit detector is installed, the circuit detector is mainly installed in an area where a failure is relatively easy to occur, and the distance between every two adjacent branch points is adjustable, and after the circuit detector is installed, a GPS positioning chip should be installed in the circuit detector to facilitate positioning during detection.
Preferably, the circuit probe transmits the detected current signal to the processing center in each branch point mainly by means of a sensor after the installation of each branch point is completed.
Preferably, in S2, the current signal data includes various parameters of the electric line operation and real-time records of the corresponding parameters, and the current signal is converted into a digital signal capable of being processed by a computer through a transmitter of the processing center after the current signal is collected.
Preferably, in S3, before comparing the processed current signals, historical information of current signal data is obtained from the power system, and then the obtained target data is compared with the historical data to determine whether the target data is current data after a fault, specifically as follows:
s301, firstly, arranging the collected current data according to the collected time sequence, and when obtaining a current data arrangement information sequence N (S) in the current time stage, the time between every two adjacent groups of interval data is 0.400 ms;
s302, obtaining historical data in the time sequence of the step S301 from the power database, and arranging the historical data according to the time sequence to obtain current data arrangement information M (S) in the historical time stage;
s303, transversely comparing the arrangement sequence n (S) in S301 with the arrangement sequence m (S) in S302 to obtain difference data j (S) ═ n (S) -m (S) under comparison;
and S304, judging whether the difference data J (S) in the S303 contains the difference sequence P (S '), if so, acquiring whether current output adjustment exists in the time S ' from the power database, if so, judging that the current output adjustment is normal data, and if not, judging that the short-circuit fault exists in the starting stage of the S '.
Preferably, S301 (S) represents the current time phase, and S303 (S') represents the differential time phase.
Preferably, in S4, when it is determined that the short-circuit fault exists, the power line node where the short-circuit fault occurs is determined by the circuit detector in the corresponding branch point and the GPS chip installed in the circuit detector.
The invention has the technical effects and advantages that: according to the method for diagnosing the short-circuit fault of the power transmission line of the power system, the whole power transmission line is divided into the power transmission lines with the nodes by the circuit detector, independent current data collection is carried out among the power transmission lines with the nodes, and the collected current data are uploaded and judged rapidly through the nodes, so that whether the power transmission line under the corresponding node has the short-circuit fault or not is rapidly obtained, and various parameters of the power distribution line in operation can be effectively monitored and recorded. When the monitoring data is abnormal, the specific position of the fault can be calculated according to the data, the detection efficiency is higher, and the working personnel can be rapidly helped to overhaul the fault stage.
Drawings
FIG. 1 is a flow chart of the invention as a whole;
fig. 2 is a flow chart of the fault analysis and determination of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for diagnosing a short-circuit fault of a power transmission line of a power system, which comprises the following steps of:
s1, firstly, installing circuit detectors on each branch point of the power transmission line;
s2, collecting the current signal data of the circuit detectors mounted on each branch point in real time, and preprocessing the current signal data;
s3, comparing and analyzing the preprocessed current signal data with historical current data, and judging whether a short-circuit fault of the electric line occurs;
and S4, determining the specific branch point of the electric line with the current short-circuit fault according to the corresponding circuit detector after determining that the electric line has the short-circuit fault.
Further, in S1, when installing the circuit detector, the circuit detector is mainly installed in an area where faults are likely to occur, detection of the operation status of each section is enhanced, and the distance between every two adjacent branch points is adjustable, so that the corresponding node can be adjusted according to the actual status, and is not limited to a node with a certain length.
Furthermore, after the circuit detector is installed at each branch point, the detected current signal is transmitted to the processing center in each branch point mainly in a sensor mode, and then each branch point uploads data to the master control center in a network mode, so that the centralized and rapid processing of the data is facilitated.
Further, in S2, the current signal data includes various parameters in the operation of the power line and real-time records under the corresponding parameters, where the current data is total data in the power transmission process of the power transmission line, and does not refer to only one form of current or voltage, and after the current signal is collected, the current signal is converted into a digital signal capable of being processed by a computer through a transmitter of the processing center, where the transmitter includes a current transmitter and a voltage transmitter.
Further, in S3, before comparing the processed current signals, historical information of current signal data is obtained from the power system, and then the obtained target data is compared with the historical data to determine whether the target data is current data after a fault, which is specifically as follows:
s301, firstly, arranging the collected current data according to the collected time sequence, and when obtaining a current data arrangement information sequence N (S) in the current time stage, the time between every two adjacent groups of interval data is 0.400 ms;
s302, obtaining historical data in the time sequence of the step S301 from the power database, and arranging the historical data according to the time sequence to obtain current data arrangement information M (S) in the historical time stage;
s303, transversely comparing the arrangement sequence n (S) in S301 with the arrangement sequence m (S) in S302 to obtain difference data j (S) ═ n (S) -m (S) under comparison;
and S304, judging whether the difference data J (S) in the S303 contains the difference sequence P (S '), if so, acquiring whether current output adjustment exists in the time S ' from the power database, if so, judging that the current output adjustment is normal data, and if not, judging that the short-circuit fault exists in the starting stage of the S '.
Further, (S) in S301 denotes the current time phase, and S303(S ') denotes the difference time phase, where (S') is equal to or less than (S).
Further, in S4, when it is determined that the short-circuit fault exists, the power line node where the short-circuit fault occurs is determined by the circuit detector in the corresponding branch point and the GPS chip installed in the circuit detector.
According to the working principle, the method for diagnosing the short-circuit fault of the power transmission line of the power system comprises the steps of firstly installing circuit detectors on each branch point of the power transmission line; collecting current signal data of circuit detectors mounted on each branch point in real time, and preprocessing the current signal data; arranging the collected current data according to the collected time sequence, and obtaining a current data arrangement information sequence N(s) at the current time stage, wherein the time between every two adjacent groups of interval data is 0.400 ms; obtaining historical data in the time sequence of S301 from the power database, and arranging the historical data according to the time sequence to obtain current data arrangement information M (S) in the historical time stage; transversely comparing the arrangement sequence N (S) in the S301 with the arrangement sequence M (S) in the S302 to obtain difference data J (S) -N (S) -M (S) under comparison; and judging whether the difference data J (S) in the S303 contains the difference sequence P (S '), if so, acquiring whether current output adjustment exists in the time S ' from the power database, if so, judging that the current output adjustment is normal data, if not, judging that the short-circuit fault exists in the starting stage of the S ', determining the short-circuit fault of the electric line, and then determining the specific branch point of the electric line with the current short-circuit fault according to a corresponding circuit detector.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. A method for diagnosing short-circuit fault of power transmission line of power system is characterized by comprising the following steps:
s1, firstly, installing circuit detectors on each branch point of the power transmission line;
s2, collecting the current signal data of the circuit detectors mounted on each branch point in real time, and preprocessing the current signal data;
s3, comparing and analyzing the preprocessed current signal data with historical current data, and judging whether a short-circuit fault of the electric line occurs;
and S4, determining the specific branch point of the electric line with the current short-circuit fault according to the corresponding circuit detector after determining that the electric line has the short-circuit fault.
2. The method according to claim 1, wherein in step S1, when installing the circuit detector, the circuit detector is mainly installed in an area where faults are relatively easy to occur, the distance between every two adjacent branch points is adjustable, and after the circuit detector is installed, a GPS positioning chip is further installed in the circuit detector for facilitating positioning during detection.
3. The method according to claim 2, wherein the circuit detector transmits the detected current signal to the processing center in each branch point mainly by means of a sensor after the installation of each branch point is completed.
4. The method according to claim 3, wherein in step S2, the current signal data includes various parameters of the operation of the power line and real-time records of the parameters, and the current signal is converted into digital signals capable of being processed by a computer via a transmitter of the processing center after the current signal is collected.
5. The method according to claim 4, wherein in step S3, before comparing the processed current signals, historical information of current signal data is obtained from the power system, and then the obtained target data is compared with the historical data to determine whether the target data is current data after a fault, specifically as follows:
s301, firstly, arranging the collected current data according to the collected time sequence, and when obtaining a current data arrangement information sequence N (S) in the current time stage, the time between every two adjacent groups of interval data is 0.400 ms;
s302, obtaining historical data in the time sequence of the step S301 from the power database, and arranging the historical data according to the time sequence to obtain current data arrangement information M (S) in the historical time stage;
s303, transversely comparing the arrangement sequence n (S) in S301 with the arrangement sequence m (S) in S302 to obtain difference data j (S) ═ n (S) -m (S) under comparison;
and S304, judging whether the difference data J (S) in the S303 contains the difference sequence P (S '), if so, acquiring whether current output adjustment exists in the time S ' from the power database, if so, judging that the current output adjustment is normal data, and if not, judging that the short-circuit fault exists in the starting stage of the S '.
6. The method for diagnosing the short-circuit fault of the transmission line of the power system according to claim 5, wherein S301 represents a current time phase (S) and S303 represents a differential time phase (S').
7. The method for diagnosing the short-circuit fault of the transmission line of the power system according to claim 5, characterized in that: in S4, when it is determined that there is a short-circuit fault, the power line node at which the short-circuit fault occurs is determined by the circuit detector in the corresponding branch point and the GPS chip mounted in the circuit detector.
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