CN220508230U - Real-time fault detection equipment in transformer substation - Google Patents
Real-time fault detection equipment in transformer substation Download PDFInfo
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- CN220508230U CN220508230U CN202320063394.XU CN202320063394U CN220508230U CN 220508230 U CN220508230 U CN 220508230U CN 202320063394 U CN202320063394 U CN 202320063394U CN 220508230 U CN220508230 U CN 220508230U
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- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 239000013307 optical fiber Substances 0.000 claims abstract description 74
- 230000003287 optical effect Effects 0.000 claims abstract description 72
- 230000008054 signal transmission Effects 0.000 claims abstract description 53
- 238000011897 real-time detection Methods 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 230000001427 coherent effect Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000004927 fusion Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000000253 optical time-domain reflectometry Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
The application discloses a fault real-time detection equipment in transformer substation. The system comprises a signal transmission optical cable and optical fiber vibration signal demodulation equipment, wherein the signal transmission optical cable is designed, a plurality of optical fiber vibration sensors are connected in series on the signal transmission optical cable, and the optical fiber vibration sensors are respectively arranged on each fault detection point of a transformer substation; the optical fiber vibration signal demodulation equipment is connected with the optical fiber vibration sensor through the signal transmission optical cable, faults of each fault detection point are detected through the optical fiber vibration sensor, then detection signals are transmitted to the optical fiber vibration signal demodulation equipment through the signal transmission optical cable, each fault detection point can be continuously monitored for a long distance through the optical fiber vibration sensor, the fault condition of the transformer substation is effectively detected in real time, and accurate positioning is achieved.
Description
Technical Field
The disclosure relates to the technical field of transformer substation fault detection, in particular to a transformer substation internal fault real-time detection device.
Background
In the monitoring of faults in the transformer substation, parameters are usually detected by an electrified instrument, and the faults of the transformer substation mainly comprise automatic disconnection of a switch, disconnection of the switch during relay protection, abnormal power and the like; when a fault occurs, the fault monitoring equipment in the transformer station can give an alarm and wait for manual inspection to find (such as a direct current fault real-time monitoring device in a transformer station of CN 214503855U); therefore, some faults cannot be detected in real time, and some faults which are developing cannot be detected at the same time until the faults have certain consequences.
Disclosure of Invention
In view of the above-mentioned drawbacks or shortcomings in the prior art, it is desirable to provide an in-substation fault real-time detection device capable of detecting a substation fault in real time.
In a first aspect, a real-time fault detection device in a substation includes:
the signal transmission optical cable is connected with a plurality of optical fiber vibration sensors in series, and the optical fiber vibration sensors are respectively arranged on each fault detection point of the transformer substation;
and the optical fiber vibration signal demodulation equipment is connected with the optical fiber vibration sensor through the signal transmission optical cable.
According to the technical scheme provided by the embodiment of the application, the optical fiber vibration sensor comprises an elastic sensor base, wherein the elastic sensor base is attached to each fault detection point, an optical fiber is wound on the elastic sensor base, connecting flanges are arranged at two ends of the optical fiber, and the connecting flanges are connected with the signal transmission optical cable.
According to the technical scheme provided by the embodiment of the application, the optical fiber with the first spatial resolution is wound on the elastic sensor base.
According to the technical scheme provided by the embodiment of the application, the optical fiber vibration signal demodulation equipment has the second spatial resolution, and the second spatial resolution is larger than the first spatial resolution which is 5 times larger than the first spatial resolution.
According to the technical scheme provided by the embodiment of the application, the optical fiber vibration signal demodulation equipment comprises a narrow linewidth laser, a pulse modulator, an optical circulator, a photoelectric conversion module, a data acquisition module and a processing module which are electrically connected in sequence;
the narrow linewidth laser is configured to provide continuous light with a narrow linewidth for the light source and output the continuous light to the pulse modulator;
the pulse modulator is configured to modulate the continuous light into a pulsed light signal;
the optical circulator is configured to inject a pulse optical signal into the signal transmission optical cable, the optical signal is subjected to Rayleigh scattering in the signal transmission optical cable, and coherent light reflected back in the signal transmission optical cable is received and output to the photoelectric conversion module;
the photoelectric conversion module is configured to convert the Rayleigh scattered coherent light into an electrical signal;
the data acquisition module is configured to acquire the electric signals output by the photoelectric conversion module and transmit the electric signals to the processing module;
the processing module is configured to perform signal processing on the electric signals to obtain real-time vibration amplitude and frequency of a fault detection point of the transformer substation.
According to the technical scheme provided by the embodiment of the application, the method further comprises the following steps: and the alarm module is configured to detect the change of the vibration signal in real time and send out an alarm.
According to the technical scheme provided by the embodiment of the application, the optical fiber vibration sensor is directly connected with the signal transmission optical cable in a fusion mode or connected with the signal transmission optical cable through a connecting flange.
According to the technical scheme provided by the embodiment of the application, the signal transmission optical cable is a single-mode communication optical cable, and the model of the signal transmission optical cable is a G.652 type conventional single-mode optical cable.
In summary, the technical scheme specifically discloses a real-time fault detection device in a transformer substation, which is designed with a signal transmission optical cable, a plurality of optical fiber vibration sensors are connected in series on the signal transmission optical cable, and the optical fiber vibration sensors are respectively arranged on each fault detection point of the transformer substation; the optical fiber vibration signal demodulation equipment is connected with the optical fiber vibration sensor through the signal transmission optical cable, faults of each fault detection point are detected through the optical fiber vibration sensor, then detection signals are transmitted to the optical fiber vibration signal demodulation equipment through the signal transmission optical cable, each fault detection point can be continuously monitored for a long distance through the optical fiber vibration sensor, the fault condition of the transformer substation is effectively detected in real time, and accurate positioning is achieved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
fig. 1 is a schematic structural diagram of a real-time fault detection device in a transformer substation.
Fig. 2 is a schematic structural diagram of an optical fiber vibration sensor of a real-time fault detection device in a transformer substation.
Fig. 3 is a schematic structural diagram of an optical fiber vibration signal demodulation device of a real-time fault detection device in a transformer substation.
Reference numerals in the drawings: 1. a signal transmission optical cable; 2. an optical fiber vibration sensor; 21. an elastic sensor base; 22. an optical fiber; 23. a connecting flange; 3. an optical fiber vibration signal demodulation device; 31. a narrow linewidth laser; 32. a pulse modulator; 33. an optical circulator; 34. a photoelectric conversion module; 35. a data acquisition module; 36. a processing module; 4. and an alarm module.
Detailed Description
The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the utility model are shown in the drawings.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
Please refer to fig. 1, which illustrates an in-substation fault real-time detection device provided by the present application, including:
the signal transmission optical cable 1 is connected with a plurality of optical fiber vibration sensors 2 in series, and the optical fiber vibration sensors 2 are respectively arranged on each fault detection point of the transformer substation;
further, the sensitivity of the signal transmission optical cable 1 is set to 0, and the response of the signal transmission optical cable 1 to the signal is eliminated;
an optical fiber vibration signal demodulation device 3 connected to the optical fiber vibration sensor 2 through a signal transmission optical cable 1.
In the present embodiment, a signal transmission optical cable 1 for transmitting an optical signal;
the optical fiber vibration sensors 2 are connected in series with the signal transmission optical cable 1 and are respectively arranged on each fault detection point of the transformer substation;
furthermore, the optical fiber vibration sensor 2 is a distributed optical fiber vibration sensor 2, and the distributed optical fiber sensing technology is a new technology developed in recent years, has the characteristics of corrosion resistance, high sensitivity, large dynamic range and long-distance continuous monitoring, can effectively detect the fault condition of a transformer substation through processing and analyzing detection signals, and realizes accurate positioning;
the optical fiber vibration signal demodulation equipment 3 is connected with the optical fiber vibration sensor 2 through the signal transmission optical cable 1 and is used for demodulating the vibration signal of the optical fiber vibration sensor 2 on the signal transmission optical cable 1 to obtain real-time vibration data;
the optical fiber vibration signal demodulation device 3 is based on the principle of phase OTDR (OpticalTimeDomain Reflectometer), and is characterized by strong anti-interference performance, the signal transmission optical cable 1 is divided into a plurality of independent vibration sensing segments, the independent vibration sensing segments are not affected by each other, the independence of the optical fiber vibration sensors 2 between each fault detection point can be ensured when the optical fiber vibration signal demodulation device 3 is applied to fault detection of a transformer substation, and the optical fiber vibration signal demodulation device 3 can also perform independent parameter setting on each optical fiber vibration sensor 2.
As shown in fig. 2, in particular, the optical fiber vibration sensor 2 includes an elastic sensor base 21, an optical fiber 22, and a connection flange 23;
the elastic sensor base 21 is attached to each fault detection point, and has a cylindrical or conical shape, for example, which facilitates the concentration of the optical fiber 22 on the fault detection point by winding for improving the signal-to-noise ratio;
an optical fiber 22 wound around the elastic sensor base 21, for transmitting a substance of an optical signal;
and a connection flange 23 connected to both ends of the optical fiber 22, the connection flange 23 being connected to the signal transmission cable 1.
As shown in fig. 2, the elastic sensor base 21 is wound with an optical fiber 22 having a first spatial resolution;
further, the optical fiber 22 of the first spatial resolution wound on the elastic sensor base 21 completely separates the vibration signals of the adjacent two optical fiber vibration sensors 2.
As shown in fig. 1, the optical fiber vibration signal demodulation apparatus 3 has a first spatial resolution, the signal transmission optical cable 1 between two adjacent optical fiber vibration sensors 2 has a second length, and the signal transmission optical cable 1 of the second length has a second spatial resolution, so that the second spatial resolution is greater than the first spatial resolution of the optical fiber vibration signal demodulation apparatus 3 by 5 times in order to ensure the independence between the respective optical fiber vibration sensors 2.
As shown in fig. 3, the optical fiber vibration signal demodulation apparatus 3 includes a narrow linewidth laser 31, a pulse modulator 32, an optical circulator 33, a photoelectric conversion module 34, a data acquisition module 35, and a processing module 36, which are electrically connected in this order;
the narrow linewidth laser 31 is configured to provide a light source with continuous light of a narrow linewidth, and output to the pulse modulator 32;
the pulse modulator 32 is configured to modulate the continuous light into a pulsed light signal;
the optical circulator is configured to inject a pulse optical signal into the signal transmission optical cable 1, perform rayleigh scattering on the light in the signal transmission optical cable 1, receive coherent light reflected back in the signal transmission optical cable 1, and output the coherent light to the photoelectric conversion module 34;
the photoelectric conversion module 34 is configured to convert the rayleigh scattered coherent light into an electrical signal;
the data acquisition module 35 is configured to acquire the electrical signal output by the photoelectric conversion module 34, and transmit the electrical signal to the processing module 36;
the processing module 36 is configured to perform signal processing on the electrical signal to obtain real-time vibration amplitude and frequency of a fault detection point of the transformer substation;
further, the processing module 36 is specifically configured to:
1) Each fiber vibration sensor 2 on the signal transmission cable 1 has a time-varying signal X according to the original rayleigh scattering curve s (t) wherein X s (t) represents a vibration signal on the signal transmission optical cable 1 at a distance s from the optical fiber vibration signal demodulation apparatus 3;
2) Signal X for each fault detection point s (T) adding width T w Then wavelet transformation is carried out on the signals in each time window, the threshold value is reduced in noise, the root mean square is obtained on the reconstructed signals, the vibration level of the signals in the time window is obtained, and then the vibration signals at each fault detection point on the signal transmission optical cable 1 are obtained as YT(s), wherein YT(s) represents the vibration of all positions of the signal transmission optical cable 1 at the moment TA signal; the positioning period is as follows: t (T) 1 ＝T p *T w Wherein T is 1 Indicating the positioning period, T p Representing pulse repetition period, T w Representing a time window;
3) And (3) carrying out peak detection on the YT(s) to obtain the position of the mutation edge, thereby obtaining the position of the fault detection point at the time point.
As shown in fig. 1, further includes: and the alarm module 4 is configured to detect the change of the vibration signal in real time, and when detecting that the vibration amplitude or the frequency is changed, an alarm is sent out, and the alarm content comprises the number of the optical fiber vibration sensor 2 and the change trend of the vibration signal.
The optical fiber vibration sensor 2 is directly fusion-connected with the signal transmission optical cable 1 or connected through a connecting flange 23.
As shown in fig. 1, the signal transmission optical cable 1 is a single-mode communication optical cable, and the model of the signal transmission optical cable is a g.652 type conventional single-mode optical cable, and the g.652 type conventional single-mode optical cable includes four subclasses of g.652a, g.652b, g.652c and g.652 d;
alternatively, the type of the signal transmission optical cable 1 is, for example, a g.653 conventional single-mode optical cable.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the utility model referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the utility model. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (8)
1. A real-time fault detection device in a substation, comprising:
the signal transmission optical cable (1) is connected with a plurality of optical fiber vibration sensors (2) in series, and the optical fiber vibration sensors (2) are respectively arranged on each fault detection point of the transformer substation;
and the optical fiber vibration signal demodulation device (3) is connected with the optical fiber vibration sensor (2) through the signal transmission optical cable (1).
2. The substation interior fault real-time detection device according to claim 1, wherein: the optical fiber vibration sensor (2) comprises an elastic sensor base (21) which is attached to each fault detection point, optical fibers (22) are wound on the elastic sensor base (21), connecting flanges (23) are arranged at two ends of each optical fiber (22), and the connecting flanges (23) are connected with the signal transmission optical cable (1).
3. The substation interior fault real-time detection device according to claim 2, wherein: the elastic sensor base (21) is wound with an optical fiber (22) with a first spatial resolution.
4. The substation interior fault real-time detection device according to claim 1, wherein: the optical fiber vibration signal demodulation apparatus (3) has a second spatial resolution that is greater than the first spatial resolution by a factor of 5.
5. The substation interior fault real-time detection device according to claim 1, wherein: the optical fiber vibration signal demodulation equipment (3) comprises a narrow linewidth laser (31), a pulse modulator (32), an optical circulator (33), a photoelectric conversion module (34), a data acquisition module (35) and a processing module (36) which are electrically connected in sequence;
the narrow linewidth laser (31) is configured to provide continuous light with a narrow linewidth for the light source and output the continuous light to the pulse modulator (32);
-the pulse modulator (32) is configured for modulating the continuous light into a pulsed light signal;
the optical circulator is configured to inject a pulse optical signal into the signal transmission optical cable (1), the light is subjected to Rayleigh scattering in the signal transmission optical cable (1), and coherent light reflected back in the signal transmission optical cable (1) is received and output to the photoelectric conversion module (34);
-the photoelectric conversion module (34) is configured for converting the rayleigh scattered coherent light into an electrical signal;
the data acquisition module (35) is configured to acquire an electric signal output by the photoelectric conversion module (34) and transmit the electric signal to the processing module (36);
the processing module (36) is configured to perform signal processing on the electrical signal to obtain real-time vibration amplitude and frequency of a fault detection point of the transformer substation.
6. The in-substation fault real-time detection device according to claim 1, further comprising: an alarm module (4) configured to detect in real time a change in the vibration signal and to issue an alarm.
7. The substation interior fault real-time detection device according to claim 1, wherein: the optical fiber vibration sensor (2) is directly connected with the signal transmission optical cable (1) in a fusion mode or is connected with the signal transmission optical cable through a connecting flange (23).
8. The substation interior fault real-time detection device according to claim 1, wherein: the signal transmission optical cable (1) is a single-mode communication optical cable, and the model of the signal transmission optical cable is a G.652 type conventional single-mode optical cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320063394.XU CN220508230U (en) | 2023-01-10 | 2023-01-10 | Real-time fault detection equipment in transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320063394.XU CN220508230U (en) | 2023-01-10 | 2023-01-10 | Real-time fault detection equipment in transformer substation |
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| Publication Number | Publication Date |
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| CN220508230U true CN220508230U (en) | 2024-02-20 |
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| CN202320063394.XU Active CN220508230U (en) | 2023-01-10 | 2023-01-10 | Real-time fault detection equipment in transformer substation |
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| CN (1) | CN220508230U (en) |
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- 2023-01-10 CN CN202320063394.XU patent/CN220508230U/en active Active
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