CN110470936B - A method and device for testing the resistive current of a line arrester - Google Patents
A method and device for testing the resistive current of a line arrester Download PDFInfo
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Abstract
本申请公开了一种线路避雷器阻性电流测试方法及装置，持续获取线路避雷器所在线路上电压互感器二次侧实时电压波形和线路避雷器处的全电流实时波形，实时电压波形由北斗卫星确定电压采样点的标准时间，全电流实时波形由北斗卫星确定电流采样点的标准时间；根据全电流实时波形和与其同时段的实时电压波形，计算阻性电流。本申请的技术方案可利用北斗卫星的精确授时功能同步电压与电流波形和相位信号，通过北斗卫星的定位功能获得线路避雷器的位置信息，根据输电线路的路径获得变电站到线路避雷器的线路长度，来矫正测量点因分布电感造成的相位差，从而可有效地根据电压与电流的相位差来获得阻性电流分量。
The present application discloses a method and device for testing the resistive current of a line arrester, which continuously obtains the real-time voltage waveform on the secondary side of the voltage transformer on the line where the line arrester is located and the full-current real-time waveform at the line arrester. The real-time voltage waveform is determined by the Beidou satellite. The standard time of the sampling point and the real-time waveform of the full current are determined by the Beidou satellite. The technical solution of the present application can use the precise timing function of the Beidou satellite to synchronize the voltage and current waveforms and phase signals, obtain the position information of the line arrester through the positioning function of the Beidou satellite, and obtain the line length from the substation to the line arrester according to the path of the transmission line. The phase difference caused by the distributed inductance at the measurement point is corrected, so that the resistive current component can be effectively obtained according to the phase difference between the voltage and the current.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a method and a device for testing resistive current of a line arrester.
Background
The line arrester is an important device on a power transmission line, and mainly plays a role in limiting overvoltage of the line, so that other power equipment is prevented from being damaged by overvoltage invasion, and the power line and power station equipment can run safely. The line lightning arrester is exposed to wind and sunlight, and the lightning arrester can be aged, damaged and damped under the environments of chemical erosion, weather and ray irradiation in the sun. The leakage current of the line arrester after being affected with damp is increased, so that the arrester is heated and even explodes, and whether the line arrester is affected with damp or not and whether insulation is necessary or not is detected.
The detection test of the line arrester mainly comprises a power failure test and a direct current leakage current test, the two methods both need the power failure test and need to detach the line arrester from a tower, the detachment process is very difficult, and defects cannot be effectively found in time. The live test of the line arrester can be carried out in a live mode, the damp condition of the line arrester can be judged through parameters such as total current and resistive current, and the live test can also be called as a resistive current test under the operating condition. The resistive current test needs to accurately obtain the phase angle difference between the voltage and the current of the lightning arrester, and needs the consistency between the current and a voltage clock. However, no TV near the line arrester can not obtain the voltage information of the line point nearby, so that the distance is long, no communication signal may exist in a remote substation, the communication transmission is delayed, and the line has distributed inductance and capacitance, and the phase angle difference problem exists in the remote transmission distance, which all affect the test of the line arrester.
Therefore, how to effectively measure the resistive current of the line arrester becomes an urgent problem to be solved by those skilled in the art.
Disclosure of Invention
The application provides a method and a device for testing the resistive current of a line arrester, which are used for solving the problem that the existing method for measuring the resistive current of the line arrester cannot effectively measure the resistive current.
In a first aspect, an embodiment of the present application provides a method for testing a resistive current of a line arrester, including:
continuously acquiring a secondary side real-time voltage waveform of a voltage transformer on a line where a line arrester is located and a full current real-time waveform at the line arrester, wherein a first transformer substation and a second transformer substation are respectively arranged at two ends of the line where the line arrester is located, the real-time voltage waveform determines standard time of a voltage sampling point by a Beidou satellite, and the full current real-time waveform determines standard time of a current sampling point by the Beidou satellite;
and calculating the resistive current according to the full current real-time waveform and the real-time voltage waveform in the same time period as the full current real-time waveform.
With reference to the first aspect, in an implementation manner of the first aspect, the step of calculating a resistive current according to the full-current real-time waveform and the real-time voltage waveform of the same time period as the full-current real-time waveform includes:
calculating the distances between the line arrester and a starting point transformer substation and a terminal point transformer substation on the line respectively according to the satellite positioning position of the line arrester and the line path information;
calculating the angle of the voltage phase lag of the line arrester at the starting transformer substation according to the voltage waveform phase difference angle under the real-time voltage waveform standard time and the distances between the line arrester and the starting transformer substation and the final transformer substation on the line respectively;
calculating the voltage waveform when the line arrester has resistive current according to the angle and the real-time voltage waveform;
and determining the part with the same phase in the voltage waveform when the line arrester has the resistive current and the full current real-time waveform as a resistive current component.
With reference to the first aspect, in an implementable manner of the first aspect, the angle of the line arrester with respect to which the voltage phase lags the origin substation is calculated according to the following formula:
wherein l1For the distance, l, of the line arrester from the starting point substation on the line2The distance between the line arrester and the end-point substation on the line,
and the phase difference angle of the voltage waveform under the standard time of the real-time voltage waveform is obtained.
With reference to the first aspect, in one implementation form of the first aspect, the voltage waveform when the line arrester has resistive current is calculated according to the following formula:
wherein U ═ g (t) is the real-time voltage waveform.
With reference to the first aspect, in an implementation manner of the first aspect, before the calculating distances between the line arrester and the starting-point substation and the ending-point substation on the line according to the satellite positioning position of the line arrester and the line path information, the method further includes:
and determining the transmission direction of the electric energy on the lead according to the phase difference angle of the voltage waveform under the standard time, wherein the transformer substation in the voltage leading direction is a starting transformer substation, and the transformer substation in the voltage lagging direction is a finishing transformer substation.
In a second aspect, an embodiment of the present application provides a device for testing a resistive current of a line arrester, including:
the system comprises a waveform acquisition module, a voltage transformer, a line arrester and a power supply module, wherein the waveform acquisition module is used for continuously acquiring a secondary side real-time voltage waveform of the voltage transformer on a line where the line arrester is located and a full current real-time waveform at the line arrester, a first transformer substation and a second transformer substation are respectively arranged at two ends of the line where the line arrester is located, the real-time voltage waveform determines standard time of a voltage sampling point by a Beidou satellite, and the full current real-time waveform determines standard time of a current sampling point by the Beidou satellite;
and the resistive current calculating module is used for calculating the resistive current according to the full current real-time waveform and the real-time voltage waveform in the same time period as the full current real-time waveform.
With reference to the second aspect, in one implementation manner of the second aspect, the resistive current calculation module includes:
the distance calculation unit is used for calculating the distances between the line arrester and a starting point transformer substation and a terminal point transformer substation on the line respectively according to the satellite positioning position of the line arrester and the line path information;
the angle calculation unit is used for calculating the angle of the voltage phase lag of the line arrester at the starting transformer substation according to the voltage waveform phase difference angle under the real-time voltage waveform standard time and the distances between the line arrester and the starting transformer substation and the final transformer substation on the line respectively;
the waveform calculating unit is used for calculating the voltage waveform when the line arrester has resistive current according to the angle and the real-time voltage waveform;
and the resistive current determining unit is used for determining the voltage waveform when the line arrester has resistive current and the part with the same phase in the full current real-time waveform as a resistive current component.
With reference to the second aspect, in an implementable manner of the second aspect, the angle calculation unit calculates the angle of the line arrester with respect to the voltage phase lag starting point substation according to the following formula:
wherein l1For the distance, l, of the line arrester from the starting point substation on the line2The distance between the line arrester and the end-point substation on the line,
and the phase difference angle of the voltage waveform under the standard time of the real-time voltage waveform is obtained.
With reference to the second aspect, in an implementable manner of the second aspect, the waveform calculation unit calculates a voltage waveform when the line arrester has a resistive current according to the following formula:
wherein U ═ g (t) is the real-time voltage waveform.
With reference to the second aspect, in an implementation manner of the second aspect, the resistive current calculation module further includes:
and the propagation direction determining unit is used for determining the propagation direction of the electric energy on the lead according to the phase difference angle of the voltage waveform under the standard time, wherein the transformer substation in the voltage leading direction is a starting transformer substation, and the transformer substation in the voltage lagging direction is a finishing transformer substation.
According to the technical scheme, the embodiment of the application provides a method and a device for testing the resistive current of the line arrester, the method and the device are used for continuously obtaining the real-time voltage waveform of the secondary side of a voltage transformer on the line where the line arrester is located and the real-time full current waveform of the line arrester, a first transformer substation and a second transformer substation are respectively arranged at two ends of the line where the line arrester is located, the standard time of a voltage sampling point is determined by a Beidou satellite for the real-time voltage waveform, and the standard time of a current sampling point is determined by the Beidou satellite for the real-time full current waveform; and calculating the resistive current according to the full current real-time waveform and the real-time voltage waveform in the same time period as the full current real-time waveform. The technical scheme of this application can utilize the accurate time service function synchronizing voltage and current waveform and the phase signal of big dipper satellite, obtains the positional information of line arrester through the locate function of big dipper satellite, obtains the circuit length of transformer substation to line arrester according to transmission line's route, corrects the phase difference that the measuring point caused because of distributed inductance to can obtain resistive current component according to the phase difference of voltage and electric current effectively.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a flowchart of a method for testing a resistive current of a line arrester according to an embodiment of the present application;
fig. 2 is a schematic diagram of a line structure for installing a line arrester according to an embodiment of the present application;
fig. 3 is a block diagram of a resistive current testing apparatus for a line arrester according to an embodiment of the present disclosure.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for testing a resistive current of a line arrester according to an embodiment of the present disclosure. As shown in fig. 1, the method for testing the resistive current of the line arrester provided by the embodiment of the present application includes the following steps:
s101, continuously obtaining a secondary side real-time voltage waveform of a voltage transformer on a line where a line arrester is located and a full current real-time waveform at the line arrester, wherein a first transformer substation and a second transformer substation are respectively arranged at two ends of the line where the line arrester is located, the real-time voltage waveform determines standard time of a voltage sampling point through a Beidou satellite, and the full current real-time waveform determines standard time of a current sampling point through the Beidou satellite. The first transformer substation and the second transformer substation receive the real-time voltage waveform and the full-current real-time waveform through satellite communication, and a main processor is further arranged in the first transformer substation and the second transformer substation and used for processing waveform signals. The real-time voltage waveform may be denoted by U ═ g (t), and the full-current real-time waveform may be denoted by I ═ f (t).
Fig. 2 is a schematic diagram of a line structure for installing a line arrester according to an embodiment of the present application. As shown in fig. 2, the real-time voltage waveform signals of the line are obtained at the line voltage transformer 1 of the first substation a and the line voltage transformer 7 of the second substation B at the head and the tail of the line, and may be single-phase or three-phase. The implementation method is that the voltage acquisition units on the first main processor 3 and the second main processor 5 are respectively obtained at the secondary terminals of the secondary terminal box 2 of the corresponding voltage transformer 1 and the secondary terminal box 6 of the corresponding voltage transformer 7. The voltage acquisition units on the first main processor 3 and the second main processor 5 respectively obtain time under a standard clock through the Beidou satellite time service function synchronous clocksThe voltage waveform U ═ g (T), the first main processor 3 continuously acquires the voltage signal and temporarily stores it, and the second main processor 5 stores the time TB∈[tb1,tb2]Is transmitted to the first main processor 3 in the a station through satellite communication. The method comprises the steps of obtaining real-time full current information of leakage current of a line arrester 8 to be measured at a discharge counting position of the arrester, transmitting full current real-time waveform to a current acquisition terminal 4, synchronizing a clock by the current acquisition terminal 4 through a Beidou satellite time service function, acquiring a synchronous clock signal for current, continuously obtaining standard time, namely current waveform I (f) (t), and transmitting the information to a first main processor 3 located in a transformer substation A through satellite communication.
And S102, calculating the resistive current according to the full current real-time waveform and the real-time voltage waveform in the same time period as the full current real-time waveform. In the embodiment of the application, the process of calculating the resistive current is realized by the main processor in the first substation, and meanwhile, the period can be understood as the time T of the full-current real-time waveform and the real-time voltage waveformB∈[tb1,tb2]Is obtained in a time period, wherein the time TB∈[tb1,tb2]Is transmitted by the second substation to the first substation via satellite communication.
In addition, before the resistive current is calculated, the propagation direction of the electric energy on the lead is determined according to the phase difference angle of the voltage waveform in the standard time, wherein a substation in the voltage leading direction is a starting substation, and a substation in the voltage lagging direction is a finishing substation.
Further, after determining the propagation direction of the electric energy on the wire, the method further comprises the following steps:
s201, calculating the distances between the line arrester and a starting point transformer substation and a destination transformer substation on the line respectively according to the satellite positioning position of the line arrester and the line path information; wherein, can be used1Indicating the distance between the line arrester and the starting point substation on the line by l2Indicating the distance of the line arrester from the end-point substation on the line.
T is intercepted from the stored waveform by the first main processor 3B∈[tb1,tb2]Waveform comparison ofUnder the same standard clock, the waveform of the same phase time-voltage U ═ g (t) acquired by the station A and the station B, and the fundamental wave function is provided through Fourier transform
And
comparison
And
larger is the starting point of current propagation.
S201, calculating the angle of the voltage phase lag of the line arrester at the starting point transformer substation according to the voltage waveform phase difference angle under the real-time voltage waveform standard time and the distances between the line arrester and the starting point transformer substation and the finishing point transformer substation on the line respectively; the angle of the voltage phase lag starting point transformer substation of the line arrester is calculated according to the following formula:
wherein l1For the distance, l, of the line arrester from the starting point substation on the line2The distance between the line arrester and the end-point substation on the line,
and the phase difference angle of the voltage waveform under the standard time of the real-time voltage waveform is obtained.
S201, calculating voltage waveform when the line arrester has resistive current according to the angle and the real-time voltage waveform; calculating the voltage waveform when the line arrester has resistive current according to the following formula:
wherein U ═ g (t) is the real-time voltage waveform.
S201, determining a voltage waveform when the line arrester has resistive current and a part with the same phase in the full current real-time waveform as a resistive current component. That is, the full current real-time waveform I ═ f (t) and
the part with the same phase is a resistive current component, and the leading voltage in I ═ f (t)
The portion of (1) is the capacitive current.
Calculating the sum voltage of the current I ═ f (t)
The phase difference angle θ of (1) is the full current value I, and the resistive current is Icos θ. Meanwhile, harmonic components of the resistive current can be obtained through further processing by other methods such as Fourier transform and the like.
Therefore, the method for testing the resistive current of the line arrester, provided by the embodiment of the application, can utilize the precise time service function of the Beidou satellite to synchronize voltage and current waveforms and phase signals, obtain the position information of the line arrester through the positioning function of the Beidou satellite, obtain the line length from a transformer substation to the line arrester according to the path of a power transmission line, correct the phase difference of a measuring point caused by distributed inductance, and further effectively obtain the resistive current component according to the phase difference of the voltage and the current.
Fig. 3 is a block diagram of a resistive current testing apparatus for a line arrester according to an embodiment of the present disclosure. As shown in fig. 3, the line arrester resistive current testing apparatus provided in the embodiment of the present application includes: the waveform acquisition module 31 is used for continuously acquiring a secondary side real-time voltage waveform of a voltage transformer on a line where a line arrester is located and a full current real-time waveform at the line arrester, wherein a first transformer substation and a second transformer substation are respectively arranged at two ends of the line where the line arrester is located, the real-time voltage waveform determines standard time of a voltage sampling point by a Beidou satellite, and the full current real-time waveform determines standard time of a current sampling point by the Beidou satellite; and the resistive current calculating module 32 is configured to calculate a resistive current according to the full current real-time waveform and the real-time voltage waveform in the same time period as the full current real-time waveform.
Wherein the resistive current calculation module comprises:
the distance calculation unit is used for calculating the distances between the line arrester and a starting point transformer substation and a terminal point transformer substation on the line respectively according to the satellite positioning position of the line arrester and the line path information;
the angle calculation unit is used for calculating the angle of the voltage phase lag of the line arrester at the starting transformer substation according to the voltage waveform phase difference angle under the real-time voltage waveform standard time and the distances between the line arrester and the starting transformer substation and the final transformer substation on the line respectively;
the waveform calculating unit is used for calculating the voltage waveform when the line arrester has resistive current according to the angle and the real-time voltage waveform; and the resistive current determining unit is used for determining the voltage waveform when the line arrester has resistive current and the part with the same phase in the full current real-time waveform as a resistive current component.
The angle calculation unit calculates the angle of the voltage phase lag starting point transformer substation of the line arrester according to the following formula:
wherein l1For the distance, l, of the line arrester from the starting point substation on the line2The distance between the line arrester and the end-point substation on the line,
and the phase difference angle of the voltage waveform under the standard time of the real-time voltage waveform is obtained.
The waveform calculating unit calculates the voltage waveform when the line arrester has resistive current according to the following formula:
wherein U ═ g (t) is the real-time voltage waveform.
The resistive current calculation module further comprises: and the propagation direction determining unit is used for determining the propagation direction of the electric energy on the lead according to the phase difference angle of the voltage waveform under the standard time, wherein the transformer substation in the voltage leading direction is a starting transformer substation, and the transformer substation in the voltage lagging direction is a finishing transformer substation.
According to the technical scheme, the embodiment of the application provides a method and a device for testing the resistive current of the line arrester, the method and the device are used for continuously obtaining the real-time voltage waveform of the secondary side of a voltage transformer on the line where the line arrester is located and the real-time full current waveform of the line arrester, a first transformer substation and a second transformer substation are respectively arranged at two ends of the line where the line arrester is located, the standard time of a voltage sampling point is determined by a Beidou satellite for the real-time voltage waveform, and the standard time of a current sampling point is determined by the Beidou satellite for the real-time full current waveform; and calculating the resistive current according to the full current real-time waveform and the real-time voltage waveform in the same time period as the full current real-time waveform. The technical scheme of this application can utilize the accurate time service function synchronizing voltage and current waveform and the phase signal of big dipper satellite, obtains the positional information of line arrester through the locate function of big dipper satellite, obtains the circuit length of transformer substation to line arrester according to transmission line's route, corrects the phase difference that the measuring point caused because of distributed inductance to can obtain resistive current component according to the phase difference of voltage and electric current effectively.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
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| CN112305348A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | Method for quickly testing resistive current of reconstructed MOA (metal oxide arrester) by considering in-phase capacitive equipment |
| CN112305351A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | MOA resistive current measuring method for leakage current reconstruction voltage |
| CN112305349A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | MOA resistive current rapid measurement method |
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