CN213482361U - Single-phase earth fault section non-setting positioning device - Google Patents
Single-phase earth fault section non-setting positioning device Download PDFInfo
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- CN213482361U CN213482361U CN202021642551.5U CN202021642551U CN213482361U CN 213482361 U CN213482361 U CN 213482361U CN 202021642551 U CN202021642551 U CN 202021642551U CN 213482361 U CN213482361 U CN 213482361U
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Abstract
The utility model discloses a single-phase earth fault section non-setting positioning device, which comprises a neutral point voltage acquisition module, an FTUDSP processor, a voltage comparison module, a data receiver, a distance comparison module and a central control decision module; the FTU DSP processor is connected with the data receiver, the neutral point voltage acquisition module is connected with the voltage comparison module, the data receiver, the voltage comparison module and the distance comparison module are all connected with the central control decision module, and the display module and the communication module are all connected with the central control decision module; the device can quickly and accurately find out the section of the power distribution network in which the single-phase earth fault occurs, setting values do not need to be set, the device is not influenced by a system operation mode, line length and transition resistance, and the device is strong in robustness, good in anti-interference capability and strong in self-adaptive capability.
Description
Technical Field
The utility model belongs to distribution network earth fault location field especially relates to a single-phase earth fault section does not have positioner of adjusting.
Background
The most likely fault in a power distribution network is a single-phase earth fault. The distribution network in China mostly adopts a low-current grounding mode, and after a single-phase grounding fault occurs, although the fault current is low and the line voltage is still symmetrical, the continuous power supply to users is not influenced for a moment, the fault is expanded or the electric equipment is damaged due to long-time operation. Therefore, after the power distribution network fault occurs, the fault is quickly and accurately detected and the section is positioned, which is a precondition and a basis for fault isolation, elimination, load transfer and power restoration, and has great significance for improving the power supply reliability of the whole power system.
In recent years, single-phase earth fault positioning theory and method are becoming mature, and mainly include: signal injection, traveling wave, transient power direction, correlation coefficient, frequency, etc. The fault location is realized by adopting a signal injection method without deep circuit analysis and simple principle, but special signal detection equipment is needed, and the cost is higher. When the fault positioning method based on the traveling wave propagation principle is used for processing the condition that the distribution network has more branches, the refraction and reflection of the traveling wave are greatly influenced, and the positioning effect is poor. The transient power direction method shows strong applicability when arc light or intermittent earth faults occur, but zero sequence voltage signals need to be collected, and most feeder line terminals can only meet the acquisition of line voltage. The correlation coefficient method has poor positioning effect on arc grounding and is easy to misjudge. When a frequency method is adopted to position a fault section, the fault working condition is complex and is often influenced by transformer saturation and electromagnetic interference.
In summary, there is a need for a device capable of rapidly and accurately positioning sections under various fault conditions in different operation modes.
SUMMERY OF THE UTILITY MODEL
In order to solve the not enough of current single-phase earth fault section positioning technique, the utility model provides a single-phase earth fault section does not have positioner of adjusting, can carry out fault location fast, accurately.
The technical scheme of the utility model as follows:
a single-phase earth fault section no-setting positioning device comprises: the system comprises a neutral point voltage acquisition module, an FTU DSP (digital signal processing unit), a voltage comparison module, a data receiver, a distance comparison module and a central control decision module;
the FTU DSP processor is connected with the data receiver, the neutral point voltage acquisition module is connected with the voltage comparison module, the data receiver, the voltage comparison module and the distance comparison module are all connected with the central control decision module, and the display module and the communication module are all connected with the central control decision module;
the distance comparison module is used for comparing the distance between each sample to be tested and the clustering center, determining the position of the fault information source and returning the position to the central control decision module;
the neutral point voltage acquisition module is used for acquiring neutral point voltage from the secondary side of the neutral point voltage transformer and transmitting the neutral point voltage to the voltage comparison module;
the voltage comparison module is used for comparing the voltage signal acquired by the neutral point voltage acquisition module with a reference signal, sending the ratio of the voltage signal to the reference signal to the central control decision module, and analyzing whether a single-phase earth fault occurs or not; and
the FTU DSP processor is used for processing fault characteristic quantities of all nodes in n FTU slave lines distributed in the whole network;
the data receiver is used for receiving the processing result of the FTU DSP processor and sending the processing result to the central control decision module;
and the central control decision module is used for acquiring a single-phase earth fault signal.
Further, the neutral point voltage acquisition module is transmitted to the voltage comparison module through the signal processing circuit.
The utility model discloses a voltage signal that signal processing circuit will gather from neutral point voltage transformer secondary side handles, obtains the signal that voltage comparison module can handle.
Further, the signal processing circuit comprises a filter circuit, an amplifying circuit and an A/D conversion circuit which are connected in series;
the voltage comparison module judges that the single-phase earth fault occurs by comparing whether the neutral point voltage detection value is a setting value.
Furthermore, the central control decision module is also connected with the upper computer through a communication module.
Furthermore, the central control decision module is also connected with a remote server through a communication module, and the remote server is connected with a remote terminal.
Furthermore, the central control decision module is further connected with a cloud server through a communication module, and the cloud server is connected with the mobile terminal.
Furthermore, the communication module is a wireless communication module or a wired cable.
Furthermore, the central control decision module is also connected with a display module.
Further, the display module is a touch screen or an LED screen.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a single-phase earth fault section does not have setting positioner, can accurately discern whether the distribution network takes place single-phase earth fault, make full use of the difference of trouble section and non-trouble section check point, can find out the section that the single-phase earth fault of distribution network takes place fast, accurately;
(2) the utility model discloses a single-phase earth fault section does not have positioner of adjusting, need not to set for the setting value, does not receive system operation mode, circuit length, transition resistance's influence, and the robustness is strong, and the interference killing feature is good to very strong self-adaptability has.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic diagram of a single-phase earth fault section no-setting positioning device of the present invention;
fig. 2 is a schematic diagram of a neutral point voltage acquisition module of the present invention;
fig. 3 is a schematic diagram of the voltage comparison module of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Fig. 1 is the utility model discloses a single-phase earth fault section does not have positioner schematic diagram of adjusting.
As shown in fig. 1, the utility model discloses a single-phase earth fault district section does not have positioner of adjusting, include:
the system comprises a neutral point voltage acquisition module, an FTU DSP (digital signal processing unit), a voltage comparison module, a data receiver, a distance comparison module and a central control decision module;
the FTU DSP processor is connected with the data receiver, the neutral point voltage acquisition module is connected with the voltage comparison module, the data receiver, the voltage comparison module and the distance comparison module are all connected with the central control decision module, and the display module and the communication module are all connected with the central control decision module;
the central control decision module 1 is connected with the distance comparison module 6;
the distance comparison module is used for comparing the distance between each sample to be tested and the clustering center, realizing the classification of the whole network FTU, searching the fault characteristic information transmission path, determining the position of a fault information source and returning the position to the central control decision module, and realizing the positioning of a fault section;
the neutral point voltage acquisition module 2 is used for acquiring neutral point voltage from the secondary side of the neutral point voltage transformer and transmitting the neutral point voltage to the voltage comparison module 3;
the voltage comparison module 3 is used for comparing the voltage signal acquired from the neutral point voltage acquisition module 2 with a reference signal, sending the ratio of the voltage signal to the reference signal to the central control decision module 1, and analyzing whether a single-phase earth fault occurs;
the voltage comparison module compares whether the neutral point voltage monitoring value exceeds a setting value or not and sends a comparison result to the central control decision module.
The FTU DSP processor 4 is used for processing fault characteristic quantities of all nodes in n FTU slave lines distributed in the whole network;
and the data receiver 5 is used for receiving the processing result of the FTU DSP processor 4 and sending the processing result to the central control decision module 1.
In this embodiment, the central control decision module 1 may be implemented by a single chip or a programmable logic device.
The neutral point voltage acquisition module 2 can be realized by adopting a voltage transformer.
As shown in fig. 2, the neutral point voltage acquisition circuit of the present invention acquires a signal of a neutral point voltage after passing through a voltage transformer whose ZMPT101B is 1:1, and obtains an amplified neutral point voltage signal through a single operational amplifier chip LMV 321.
Specifically, the neutral point voltage acquisition module is transmitted to the central control decision module through the signal processing circuit.
As shown in fig. 3, the voltage comparison module of the present invention obtains two voltage signals AIN1 and AIN2 through the operation amplifier circuit LMV321, and because the resistance values of R137 and R129 are different, the values of AIN1 and AIN2 are different, and the other signal is a square wave signal obtained through the LM393 voltage comparator and is shaped by the second-stage 74HC14D to obtain the comparison result.
The utility model discloses utilize the signal processing circuit to handle the back to the neutral point voltage that neutral point voltage transformer secondary side was gathered, input central control decision module.
Specifically, the signal processing circuit includes a filter circuit, an amplification circuit, and an a/D conversion circuit connected in series.
In another embodiment, the central control decision module 1 is further connected to a display module 7.
The display module 7 may be a touch screen or an LED screen, and is used for displaying the segment positioning result.
In another embodiment, the central control decision module 1 is further connected with the communication module 8 and connected with an upper computer.
The communication module 8 can be implemented by a wireless communication module or a wired cable.
In another embodiment, the central control decision module 1 is further connected to a remote server, which is connected to a remote terminal.
This sample utility model realizes long-range single-phase earth fault district section location result of looking over through these structures of remote server and remote terminal.
In another embodiment, the central control decision module 1 is further connected to a cloud server, and the cloud server is connected to a mobile terminal.
This sample utility model discloses a high in the clouds server and these structures of mobile terminal realize in real time and long-range single-phase earth fault district section positioning result of looking over.
Use the utility model provides a pair of single-phase earth fault district section does not have the district section of setting positioner and takes place single-phase earth fault to the distribution network and fixes a position, and the result is shown as table 1. According to trouble district section location result can know, the utility model discloses can pinpoint single-phase earth fault district section, satisfy the operation demand.
TABLE 1
The utility model discloses a single-phase earth fault section does not have positioner of adjusting, can accurately discern whether the distribution network takes place single-phase earth fault, the difference of make full use of trouble section and non-trouble section check point can be fast, accurately find out the section that the single-phase earth fault of distribution network takes place, need not to set for the setting value, do not receive system operation mode, circuit length, transition resistance's influence, the robustness is strong, the interference killing feature is good to very strong self-adaptability has.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. A single-phase earth fault section non-setting positioning device is characterized by comprising:
the system comprises a neutral point voltage acquisition module, an FTU DSP (digital signal processing unit), a voltage comparison module, a data receiver, a distance comparison module and a central control decision module;
the FTU DSP processor is connected with the data receiver, the neutral point voltage acquisition module is connected with the voltage comparison module, the data receiver, the voltage comparison module and the distance comparison module are all connected with the central control decision module, and the display module and the communication module are all connected with the central control decision module;
the distance comparison module is used for comparing the distance between each sample to be tested and the clustering center, determining the position of the fault information source and returning the position to the central control decision module;
the neutral point voltage acquisition module is used for acquiring neutral point voltage from the secondary side of the neutral point voltage transformer and transmitting the neutral point voltage to the voltage comparison module;
the voltage comparison module is used for comparing the voltage signal acquired by the neutral point voltage acquisition module with a reference signal, sending the ratio of the voltage signal to the reference signal to the central control decision module, and analyzing whether a single-phase earth fault occurs or not;
the FTU DSP processor is used for processing fault characteristic quantities of all nodes in n FTU slave lines distributed in the whole network;
the data receiver is used for receiving the processing result of the FTU DSP processor and sending the processing result to the central control decision module;
and the central control decision module is used for acquiring a single-phase earth fault signal.
2. The single-phase earth fault section no-setting positioning device of claim 1, wherein the neutral point voltage acquisition module is transmitted to the voltage comparison module through a signal processing circuit.
3. The single-phase earth fault section no-setting positioning device according to claim 2, wherein the signal processing circuit comprises a filter circuit, an amplifying circuit and an a/D conversion circuit connected in series;
the voltage comparison module judges that the single-phase earth fault occurs by comparing whether the neutral point voltage detection value is a setting value.
4. The non-setting positioning device for the single-phase earth fault section as claimed in claim 1, wherein the central control decision module is further connected with an upper computer through a communication module.
5. The single-phase earth fault section no-setting positioning device of claim 1, wherein the central control decision module is further connected with a remote server through a communication module, and the remote server is connected with a remote terminal.
6. The single-phase earth fault section no-setting positioning device of claim 1, wherein the central control decision module is further connected with a cloud server through a communication module, and the cloud server is connected with a mobile terminal.
7. The single-phase earth fault section no-setting positioning device according to any one of claims 4 to 6, wherein the communication module is a wireless communication module or a wired cable.
8. The single-phase earth fault section no-setting positioning device of claim 1, wherein the central control decision module is further connected with a display module.
9. The single-phase earth fault section no-setting positioning device of claim 1, wherein the display module is a touch screen or an LED screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021642551.5U CN213482361U (en) | 2020-08-08 | 2020-08-08 | Single-phase earth fault section non-setting positioning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021642551.5U CN213482361U (en) | 2020-08-08 | 2020-08-08 | Single-phase earth fault section non-setting positioning device |
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| Publication Number | Publication Date |
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| CN213482361U true CN213482361U (en) | 2021-06-18 |
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| CN202021642551.5U Active CN213482361U (en) | 2020-08-08 | 2020-08-08 | Single-phase earth fault section non-setting positioning device |
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