CN112782530A - Fault indicator for line real-time fault judgment and control method and equipment thereof - Google Patents
Fault indicator for line real-time fault judgment and control method and equipment thereof Download PDFInfo
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- CN112782530A CN112782530A CN202110062947.5A CN202110062947A CN112782530A CN 112782530 A CN112782530 A CN 112782530A CN 202110062947 A CN202110062947 A CN 202110062947A CN 112782530 A CN112782530 A CN 112782530A
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
The invention relates to a fault indicator for line real-time fault judgment and a control method and equipment thereof, wherein the fault indicator comprises at least 3 unit elements, any two unit elements form a collecting device, the other unit element is a synthesizing device, and the collecting device is used for collecting the electric quantity of a line in real time and transmitting the collected electric quantity to the synthesizing device through a wireless communication module; the synthesis device is used for synthesizing the collected electric quantity into real-time zero sequence current. The fault indicator for real-time fault judgment of the line collects the electrical quantity through the collection device and sends the collected electrical quantity to the synthesis device to synthesize the zero sequence current for judging the line fault, and the technical problems that the precision of the zero sequence current is not high and the error is large when the existing fault indicator judges the fault of the line by adopting the zero sequence current are solved.
Description
Technical Field
The invention relates to the technical field of fault indicators, in particular to a fault indicator for line real-time fault judgment and a control method and equipment thereof.
Background
The existing high-voltage grounding fault judgment basically takes the change of zero-sequence current as the basis of line fault. However, the zero sequence current transformer cannot be directly used on a high-voltage line, particularly an overhead line.
In the market, a fault indicator is generally adopted to judge a high-voltage ground fault, the existing fault indicator generally obtains a zero-sequence current by a synthesis method, and the synthesized zero-sequence current of the fault indicator is limited by the strict requirements of power supply capacity and power consumption, so that the problems are as follows: firstly, the synthesized zero-sequence current starts wave recording through current mutation or electric field mutation, after wave recording is completed by an acquisition unit of the fault indicator, waveform data are wirelessly transmitted to a collection unit through micropower (the rate is below 500 kbps), the collection unit synthesizes the zero-sequence current, and the synthesis precision of the zero-sequence current is not high due to limited communication rate; and the zero sequence current can only be synthesized when the current or the electric field is suddenly changed, and the zero sequence current cannot be synthesized in real time. Secondly, the wave recording waveform synchronization precision between the acquisition units of the fault indicator is not high, so that the error of the synthesized zero sequence current is large.
Disclosure of Invention
The embodiment of the invention provides a fault indicator for real-time fault judgment of a line and a control method and equipment thereof, which are used for solving the technical problems that the existing fault indicator adopts zero-sequence current to judge the fault of the line, and the zero-sequence current is low in precision and large in error.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a fault indicator for line real-time fault judgment comprises at least 3 unit elements, wherein any two unit elements form a collecting device, and the other unit element is a synthesizing device;
the acquisition device is used for acquiring the electric quantity of a line in real time and transmitting the acquired electric quantity to the synthesis device through the wireless communication module;
the synthesis device is used for synthesizing the collected electric quantity into real-time zero sequence current;
wherein the electrical quantities comprise current and voltage.
Preferably, each unit element comprises a DSP element, and a current transformer, a voltage transformer, an AD conversion module, a Beidou positioning module and a wireless communication module which are connected with the DSP element;
the Beidou positioning module is used for acquiring a pulse signal of 1 PPS;
the current transformer is used for collecting the current of a line according to the rising or falling of the pulse signal;
the voltage transformer is used for acquiring the voltage of a line according to the rising or falling of the pulse signal;
the AD conversion module is used for converting the acquired current and voltage into a current signal and a voltage signal of a digital signal;
the DSP element is used for controlling the wireless communication module to transmit the current signal and the voltage signal.
Preferably, the two unit elements of the acquisition device transmit the acquired current signal and the acquired voltage signal to the synthesis device through the wireless communication module, and the DSP element of the synthesis device synthesizes the zero sequence current from the current signal and the voltage signal by using point operation and algebraic sum operation.
Preferably, when the DSP element of the synthesizing device synthesizes the zero sequence current, the DSP elements of the 3 unit elements record the collected electrical quantity.
Preferably, the beidou positioning module of each unit element is further configured to provide a timestamp for the electrical quantity collected by the corresponding unit element.
Preferably, each of the unit cells further includes a power supply module for supplying power.
Preferably, the acquisition device acquires the electrical quantity of the line by adopting a sampling rate of 25.6kHz, 51.2kHz or 102.4 kHz.
The invention also provides a control method of the fault indicator for the real-time fault judgment of the line, which is applied to the fault indicator for the real-time fault judgment of the line and comprises the following steps:
acquiring the electrical quantity of a line in real time by adopting an acquisition device and transmitting the acquired electrical quantity to the synthesis device through a wireless communication module;
the synthesis device synthesizes the collected electric quantity into real-time zero sequence current, and simultaneously, the 3 unit elements record the collected electric quantity.
The present invention also provides a computer-readable storage medium for storing computer instructions, which, when run on a computer, cause the computer to execute the above-mentioned method for controlling a fault indicator for line real-time fault diagnosis.
The invention also provides a terminal device, comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the control method of the fault indicator for real-time fault judgment of the line according to the instructions in the program codes.
According to the technical scheme, the embodiment of the invention has the following advantages:
the fault indicator for line real-time fault judgment and the control method and the equipment thereof comprise at least 3 unit elements, wherein any two unit elements form a collecting device, the other unit element is a synthesizing device, and the collecting device is used for collecting the electric quantity of a line in real time and transmitting the collected electric quantity to the synthesizing device through a wireless communication module; the synthesis device is used for synthesizing the collected electric quantity into real-time zero sequence current. The fault indicator for real-time fault judgment of the line collects the electrical quantity through the collection device and sends the collected electrical quantity to the synthesis device to synthesize the zero sequence current for judging the line fault, and the technical problems that the precision of the zero sequence current is not high and the error is large when the existing fault indicator judges the fault of the line by adopting the zero sequence current are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a circuit block diagram of a fault indicator for line real-time fault determination according to an embodiment of the present invention.
Fig. 2 is a block diagram of three unit elements of a fault indicator for real-time fault diagnosis of a line according to an embodiment of the present invention.
Fig. 3 is a circuit block diagram of a fault indicator unit element for line real-time fault diagnosis according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below 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 embodiment of the application provides a fault indicator for real-time fault judgment of a line and a control method and equipment thereof, which are used for solving the technical problems that the existing fault indicator judges the fault of the line by adopting zero-sequence current, the precision of the zero-sequence current is not high and the error is large.
The first embodiment is as follows:
fig. 1 is a circuit block diagram of a fault indicator for line real-time fault determination according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a fault indicator for line real-time fault determination, which includes at least 3 unit elements, where any two unit elements form an acquisition device 10, and another unit element is a synthesis device 20;
the acquisition device 10 is used for acquiring the electrical quantity of the line in real time and transmitting the acquired electrical quantity to the synthesis device 20 through the wireless communication module;
the synthesizer 20 is configured to synthesize the collected electrical quantities into a real-time zero-sequence current;
wherein the electrical quantities comprise current and voltage.
In the embodiment of the present invention, 3 unit elements are respectively referred to as a first unit element a, a second unit element B, and a third unit element C, the first unit element a and the second unit element B constitute the acquisition apparatus 10, and the third unit element C is described as a case of the synthesis apparatus 20. In other embodiments, the first unit element a and the third unit element C constitute the acquisition device 10, and the second unit element B serves as the synthesis device 20; or the third unit cell C and the second unit cell B constitute the acquisition device 10, and the first unit cell a serves as the synthesis device 20.
Fig. 2 is a block diagram of three unit elements of a fault indicator for real-time fault diagnosis of a line according to an embodiment of the present invention.
Note that, as shown in fig. 2, the first unit cell a and the second unit cell B are connected to the third unit cell C, respectively.
Fig. 3 is a circuit block diagram of a fault indicator unit element for line real-time fault diagnosis according to an embodiment of the present invention.
As shown in fig. 1 to 3, in the embodiment of the present invention, each unit element includes a DSP element, and a current transformer, a voltage transformer, an AD conversion module, a beidou positioning module, and a wireless communication module connected to the DSP element;
the Beidou positioning module is used for acquiring a pulse signal of 1 PPS;
the current transformer is used for collecting the current of the line according to the rising or falling of the pulse signal;
the voltage transformer is used for acquiring the voltage of the line according to the rising or falling of the pulse signal;
the AD conversion module is used for converting the acquired current and voltage into a current signal and a voltage signal of a digital signal;
the DSP element is used for controlling the wireless communication module to transmit the current signal and the voltage signal.
It should be noted that, the first unit element a and the second unit element B send the original value of the collected electrical quantity to the third unit element C in real time through the wireless communication module, and the DSP element of the third unit element C synthesizes the zero sequence current in real time. Compared with the prior fault indicator for real-time fault judgment of the line, the prior fault indicator collects the effective value of the electric quantity, the effective value is calculated by the original AD value, and the prior fault indicator cannot realize real-time synthesis under the condition of low power consumption because the waveform data quantity of the collected electric quantity is very huge (for example, the collected waveform is 16 kByte/cycle wave). In this embodiment, the wireless communication module may implement data transmission by using WiFi, and may also implement data transmission by using wireless communication methods such as a local area network and the internet.
In the embodiment of the present invention, the two unit elements of the collecting device 10 transmit the collected current signal and voltage signal to the synthesizing device 20 through the wireless communication module, and the DSP element of the synthesizing device synthesizes the current signal and voltage signal into zero sequence current by using point operation and algebraic sum operation.
In embodiments of the present invention, the collection device 10 preferably collects electrical quantities of the line using a sampling rate of 25.6kHz, 51.2kHz, or 102.4 kHz.
It should be noted that, the first unit element a, the second unit element B and the third unit element C all obtain pulse signals of 1PPS standard through respective beidou positioning modules (synchronization error of each unit element is within 100 ns), AD sampling is performed on the electrical quantity of each unit element at the rising or falling edge moment of 1PPS, and after sampling for a certain time (for example, 8 cycles to 50 cycles), the first unit element a or the second unit element B transmits the electrical quantity value originally sampled by AD to the third unit element C through the transmission of the wireless communication module; the third unit element C receives the electrical quantity after the original value of the AD conversion module of the first unit element a or the second unit element B, and performs sampling point operation and algebraic sum operation on the electrical quantity original value obtained by the Beidou positioning module of the third unit element C and converted at the moment of the third unit element C to obtain a waveform electrical quantity value of the zero sequence current, so as to obtain an accurate zero sequence current waveform.
The invention provides a fault indicator for real-time fault judgment of a line, which comprises at least 3 unit elements, wherein any two unit elements form a collecting device, the other unit element is a synthesizing device, and the collecting device is used for collecting the electric quantity of the line in real time and transmitting the collected electric quantity to the synthesizing device through a wireless communication module; the synthesis device is used for synthesizing the collected electric quantity into real-time zero sequence current. The fault indicator for real-time fault judgment of the line collects the electrical quantity through the collection device and sends the collected electrical quantity to the synthesis device to synthesize the zero sequence current for judging the line fault, and the technical problems that the precision of the zero sequence current is not high and the error is large when the existing fault indicator judges the fault of the line by adopting the zero sequence current are solved.
In an embodiment of the present invention, while the DSP elements of the synthesizing device 20 synthesize the zero sequence current, the DSP elements of the 3 unit elements record the collected electrical quantity. The Beidou positioning module of each unit element is also used for providing a time stamp for the electric quantity collected by the corresponding unit element.
It should be noted that the fault indicator for real-time fault judgment of the line of the invention uses the Beidou positioning module for accurate time service, and the wireless communication module performs high-speed communication to complete the real-time synthesis of the zero-sequence current of the high-voltage overhead line of the distribution network, and also relies on the synthesized high-precision zero-sequence current to judge and position the line fault and serve as the basis for starting wave recording.
In one embodiment of the present invention, each unit cell further includes a power supply module for supplying power.
It should be noted that the power supply module is mainly used for providing a power supply of 3.5 to 5V for the DSP element, the current transformer, the voltage transformer, the AD conversion module, the beidou positioning module and the wireless communication module.
Example two:
the embodiment of the invention also provides a control method of the fault indicator for the real-time fault judgment of the line, which is applied to the fault indicator for the real-time fault judgment of the line and comprises the following steps:
the method comprises the steps that a collecting device is adopted to collect the electric quantity of a line in real time and transmit the collected electric quantity to a synthesizing device through a wireless communication module;
the synthesis device synthesizes the collected electric quantity into real-time zero sequence current, and simultaneously, the 3 unit elements record the collected electric quantity.
It should be noted that the fault indicator for line real-time fault determination applied in the control method of the second embodiment has been described in detail in the first embodiment, and therefore, the contents of the fault indicator for line real-time fault determination in the control method of the second embodiment are not described in detail. The control method in the second embodiment is also described in the first embodiment.
Example three:
an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium is used for storing computer instructions, and when the computer instructions are run on a computer, the computer is enabled to execute the above-mentioned method for controlling a fault indicator for line real-time fault determination.
Example four:
the embodiment of the invention also provides a terminal device, which comprises a processor and a memory:
a memory for storing the program code and transmitting the program code to the processor;
and the processor is used for executing the control method of the fault indicator for the real-time fault judgment of the line according to the instructions in the program codes.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A fault indicator for line real-time fault judgment is characterized by comprising at least 3 unit elements, wherein any two unit elements form an acquisition device, and the other unit element is a synthesis device;
the acquisition device is used for acquiring the electric quantity of a line in real time and transmitting the acquired electric quantity to the synthesis device through the wireless communication module;
the synthesis device is used for synthesizing the collected electric quantity into real-time zero sequence current;
wherein the electrical quantities comprise current and voltage.
2. The fault indicator for line real-time fault diagnosis according to claim 1, wherein each unit element comprises a DSP element, and a current transformer, a voltage transformer, an AD conversion module, a Beidou positioning module and a wireless communication module which are connected with the DSP element;
the Beidou positioning module is used for acquiring a pulse signal of 1 PPS;
the current transformer is used for collecting the current of a line according to the rising or falling of the pulse signal;
the voltage transformer is used for acquiring the voltage of a line according to the rising or falling of the pulse signal;
the AD conversion module is used for converting the acquired current and voltage into a current signal and a voltage signal of a digital signal;
the DSP element is used for controlling the wireless communication module to transmit the current signal and the voltage signal.
3. The fault indicator for real-time line fault diagnosis according to claim 2, wherein the two unit elements of the collecting device transmit the collected current signal and the collected voltage signal to the synthesizing device through the wireless communication module, and the DSP element of the synthesizing device synthesizes the current signal and the voltage signal into a zero-sequence current by using a point operation and an algebraic sum operation.
4. The fault indicator for line real-time fault diagnosis according to claim 3, wherein the DSP elements of the 3 unit elements record the collected electrical quantities while the DSP elements of the synthesizing device synthesize the zero sequence current.
5. The fault indicator for line real-time fault diagnosis according to claim 2, wherein the Beidou positioning module of each unit element is further configured to provide a time stamp for the electrical quantity collected by the corresponding unit element.
6. The fault indicator for line real-time fault diagnosis according to claim 1, wherein each of the unit cells further comprises a power supply module for supplying power.
7. The fault indicator for line real-time fault diagnosis according to claim 1, wherein the collecting means collects the electrical quantities of the line with a sampling rate of 25.6kHz, 51.2kHz or 102.4 kHz.
8. A control method of a fault indicator for line real-time fault diagnosis, which is applied to the fault indicator for line real-time fault diagnosis according to any one of claims 1 to 7, and is characterized by comprising the following steps:
acquiring the electrical quantity of a line in real time by adopting an acquisition device and transmitting the acquired electrical quantity to the synthesis device through a wireless communication module;
the synthesis device synthesizes the collected electric quantity into real-time zero sequence current, and simultaneously, the 3 unit elements record the collected electric quantity.
9. A computer-readable storage medium for storing computer instructions which, when run on a computer, cause the computer to execute the method for controlling a fault indicator for line real-time fault diagnosis according to claim 8.
10. A terminal device, comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the control method of the fault indicator for line real-time fault diagnosis according to claim 8 according to instructions in the program code.
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Application publication date: 20210511 |
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