CN109031048B - Fault positioning system and method based on fiber bragg grating current sensor - Google Patents
Fault positioning system and method based on fiber bragg grating current sensor Download PDFInfo
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- CN109031048B CN109031048B CN201811002456.6A CN201811002456A CN109031048B CN 109031048 B CN109031048 B CN 109031048B CN 201811002456 A CN201811002456 A CN 201811002456A CN 109031048 B CN109031048 B CN 109031048B
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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
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Abstract
The embodiment discloses a fault positioning system and method based on a fiber bragg grating current sensor, wherein the system comprises: fiber grating current sensor and monitoring host computer, the monitoring host computer includes: the optical signal component transmits an optical signal to the fiber grating current sensor and processes the optical signal reflected by the fiber grating current sensor, the electrical signal component converts the processed optical signal into an electrical signal and processes the electrical signal, the digital signal component converts the processed electrical signal into a digital signal and processes the digital signal to obtain the current and the central wavelength corresponding to the optical signal reflected by the fiber grating current sensor, and the fault diagnosis component judges the position of a fault according to the current and the central wavelength. By adopting the system or the method, the current information of the power transmission line can be monitored in real time, the fault can be found in time, and the position of the fault point can be accurately obtained according to the position of the fiber bragg grating current sensor.
Description
Technical Field
The application relates to the field of fault detection and positioning in a power system, in particular to a fault positioning system and method based on a fiber bragg grating current sensor.
Background
With the rapid development of electric utilities, more and more transmission lines are arranged in a power distribution system, so that more and more faults of the transmission lines are caused. If the faults of the power transmission line are not checked and repaired in time, huge economic loss can be brought to people, and meanwhile, great inconvenience can be brought to the life of people.
Most of the existing 10KV-35KV power distribution systems adopt a neutral ungrounded system or an arc suppression coil grounded system, but the probability of single-phase ground faults in the neutral ungrounded system or the arc suppression coil grounded system is high and accounts for more than 80%. When single-phase earth fault occurs, the voltage and phase between phases are kept unchanged, the balance of the three-phase system is not damaged, and therefore, the three-phase system can continue to operate in a short time. However, as the operation time of the belt fault point is prolonged, the belt fault point may cause phase-to-phase short circuit and even lead to the breakdown of the whole system. Therefore, there is a need to detect single-phase ground faults in power distribution systems.
At present, a commonly used method for detecting a single-phase ground fault includes a user complaint and a manual inspection, wherein the user complaint means that when the single-phase ground fault occurs and power supply is interrupted, the user complaint is sent to a relevant department of charge, and the manual inspection means that each branch point assigns power maintenance personnel regularly and inspects an area to which the power maintenance personnel belongs by using a special instrument for inspecting a power line.
However, the existing method for detecting the single-phase earth fault depends on customer complaints and manual inspection, so that the fault and the position of the fault cannot be timely and accurately found.
Disclosure of Invention
The application provides a fault positioning system and method based on a fiber bragg grating current sensor, which aim to solve the problem that when single-phase earth faults are detected in the prior art, the faults and the positions of the faults cannot be timely and accurately found out depending on user complaints and manual inspection.
In a first aspect, an embodiment of the present application provides a fault location system based on a fiber bragg grating current sensor, where the fault location system includes:
monitoring host computer and fiber grating current sensor, the monitoring host computer includes: the device comprises an optical signal component, an electrical signal component, a digital signal component and a fault diagnosis component;
the monitoring host is connected with the fiber bragg grating current sensor through an optical fiber;
the fiber bragg grating current sensor is arranged on the cable and used for reflecting the received optical signals;
the optical signal assembly is used for providing an optical signal for the fiber bragg grating current sensor and processing the optical signal reflected by the fiber bragg grating current sensor;
the electrical signal assembly is used for converting the processed optical signal reflected by the fiber bragg grating current sensor into an electrical signal and carrying out filtering and amplifying processing;
the digital signal assembly is used for converting the electric signal after filtering and amplifying into a digital signal and processing the digital signal to obtain the current and the central wavelength corresponding to the optical signal reflected by the fiber bragg grating current sensor;
and the fault diagnosis component is used for judging whether a fault occurs and the position of the fault according to the current and the central wavelength.
With reference to the first aspect, in one implementation, the optical signal assembly includes: the device comprises a broadband light source, a semiconductor optical amplifier module, an optical coupler, an optical circulator and an array waveguide grating module;
the broadband light source is used for providing optical signals for the fiber bragg grating current sensor;
the semiconductor optical amplifier module is used for amplifying the optical signal output by the broadband light source;
the optical coupler is used for dividing the amplified optical signals into three paths which are respectively used as one of three phases of electricity, and respectively transmitting the three paths of optical signals to the fiber bragg grating current sensor;
the optical circulator is used for separating the amplified optical signal from the optical signal reflected by the fiber bragg grating current sensor;
the array waveguide grating module is used for separating optical signals reflected by the fiber grating current sensor according to different wavelengths.
With reference to the first aspect, in one implementation, the electrical signal assembly includes: the photoelectric detector comprises a photoelectric detector array module and a multi-path input filtering and amplifying circuit module;
the photoelectric detector array module is used for converting optical signals with different wavelengths output by the arrayed waveguide grating module into electric signals;
and the multi-path input filtering and amplifying circuit module is used for filtering and amplifying the multi-path electric signals with different wavelengths output by the photoelectric detector array module.
With reference to the first aspect, in one implementation manner, the digital signal component includes: the device comprises a multi-path input analog-to-digital conversion module and a digital signal processing unit module.
The multi-channel input analog-to-digital conversion module is used for converting the electric signals output by the multi-channel input filtering amplification circuit module into digital signals;
and the digital signal processing unit module is used for processing the digital signals output by the multiple input analog-to-digital conversion modules to obtain the current and the central wavelength corresponding to the optical signals reflected by the fiber grating current sensor.
With reference to the first aspect, in one implementation, the fault diagnosis component includes: an industrial personal computer module;
and the industrial personal computer module is used for comparing the current corresponding to the optical signal reflected by the fiber grating current sensor with the historical current of the position where the fiber grating current sensor is located, judging whether the current is a fault current or not, and determining the position of the fault according to the corresponding relation between the central wavelength corresponding to the optical signal reflected by the fiber grating current sensor and the installation position of the fiber grating current sensor after determining that the current is the fault current.
With reference to the first aspect, in one implementation manner, the monitoring host is installed in a power grid operation control center.
With reference to the first aspect, in an implementation manner, the number of the fiber grating current sensors is N, where N is greater than or equal to 2, N is an integer, and wavelengths of adjacent fiber grating current sensors are different.
With reference to the first aspect, in one implementation, the specific location of the fault is determined from adjacent fiber grating current sensors.
In a second aspect, an embodiment of the present application provides a fault location method based on a fiber bragg grating current sensor, where the fault location method is applied to a fault location system of the fiber bragg grating current sensor, and the fault location method of the fiber bragg grating current sensor includes:
the optical signal assembly provides an optical signal for the fiber bragg grating current sensor and processes the optical signal reflected by the fiber bragg grating current sensor;
the electrical signal assembly converts the processed optical signal reflected by the fiber bragg grating current sensor into an electrical signal and performs filtering and amplification processing;
the digital signal assembly converts the electric signal after filtering and amplifying into a digital signal, and acquires the current and the central wavelength corresponding to the optical signal reflected by the fiber bragg grating current sensor by processing the digital signal;
and the fault diagnosis component judges whether a fault occurs and the position of the fault according to the current and the central wavelength.
The system and the method for fault location based on the fiber bragg grating current sensor provided by the embodiment comprise the following steps: fiber grating current sensor and monitoring host computer, the monitoring host computer includes: the device comprises an optical signal component, an electrical signal component, a digital signal component and a fault diagnosis component; wherein, the monitoring host is connected with the fiber grating current sensor through an optical fiber, the fiber grating current sensor is installed on a cable, an optical signal component transmits an optical signal to the fiber grating current sensor through the optical fiber, the fiber grating current sensor receives the optical signal, then reflects back an optical signal through the optical fiber according to the actual parameter value of the power transmission line, the optical signal reflected by the fiber grating current sensor is transmitted to the optical signal component, the optical signal component processes the reflected optical signal, the electrical signal component converts the optical signal reflected by the fiber grating current sensor after the optical signal component is processed into an electrical signal, and performs filtering amplification processing, the digital signal component converts the electrical signal processed by the electrical signal component into a digital signal, and processes the digital signal to obtain the current and the central wavelength corresponding to the optical signal reflected by the fiber grating current sensor, the current parameter information of the power transmission line and the center wavelength of the corresponding fiber bragg grating current sensor are obtained, and the fault diagnosis component judges whether a fault occurs and the position of the fault according to the current and the center wavelength.
The application provides a fault location system based on fiber grating current sensor has adopted fiber grating current sensor, can real-time supervision transmission line's current information to timely discovery trouble, and according to fiber grating current sensor's position, the accurate position of acquireing the fault point. In addition, the fiber grating current sensor has the advantages of accurate current information acquisition, strong anti-interference capability, good insulating property and no need of cable disconnection, and is a passive device, does not need external power supply, and is fast in response and high in sensitivity.
Drawings
In order to more clearly explain 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 schematic structural diagram of a fault location system based on a fiber grating current sensor according to the present application;
FIG. 2 is a schematic structural diagram of an optical signal assembly in a fault location system based on a fiber grating current sensor according to the present application;
FIG. 3 is a schematic structural diagram of an electrical signal component in a fault location system based on a fiber grating current sensor according to the present application;
FIG. 4 is a schematic structural diagram of a digital signal component in a fault location system based on a fiber grating current sensor according to the present application;
FIG. 5 is a schematic structural diagram of a fault diagnosis component in a fault location system based on a fiber grating current sensor provided by the present application;
fig. 6 is a schematic flowchart of a fault location method based on a fiber grating current sensor provided in the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
The application provides a fault positioning system and method based on a fiber bragg grating current sensor, which aim to solve the problem that when single-phase earth faults are detected in the prior art, the faults and the positions of the faults cannot be timely and accurately found out depending on user complaints and manual inspection.
Referring to fig. 1, an embodiment of the present application provides a fault location system based on a fiber bragg grating current sensor, where the fault location system includes:
the fiber grating current sensor 100 and the monitoring host 200, the monitoring host 200 includes: an optical signal component 201, an electrical signal component 202, a digital signal component 203, and a fault diagnosis component 204;
the monitoring host 200 is connected with the fiber bragg grating current sensor 100 through an optical fiber;
the fiber grating current sensor 100 is installed on a cable, and the fiber grating current sensor 100 is used for reflecting a received optical signal;
compared with other types of fault indicators, the fiber grating current sensor 100 has the advantages of accurate current information acquisition, strong anti-interference capability, good insulating property and no need of disconnecting a cable for installation, and the fiber grating current sensor 100 is a passive device and does not need external power supply; the fiber grating current sensor 100 has fast response and high sensitivity, and improves the positioning accuracy of the fault positioning system.
In addition, the fault positioning system adopts the optical fiber to transmit signals, and is high in anti-interference capacity, so that the measurement result is more accurate.
The optical signal component 201 is configured to provide an optical signal to the fiber grating current sensor 100, and process the optical signal reflected by the fiber grating current sensor 100;
the optical signal component 201 transmits an optical signal to the fiber grating current sensor 100 through an optical fiber, the fiber grating current sensor 100 receives the optical signal, and then reflects an optical signal back through the optical fiber according to the actual parameter value of the power transmission line, the optical signal reflected by the fiber grating current sensor 100 is transmitted to the optical signal component 201, and the optical signal component 201 processes the reflected optical signal.
The electrical signal component 202 is configured to convert the processed optical signal reflected by the fiber grating current sensor 100 into an electrical signal, and perform filtering and amplification processing;
the electric signal assembly 202 is used for converting the optical signal reflected by the fiber grating current sensor 100 after being processed by the optical signal assembly 201 into an electric signal, and performing filtering and amplification processing.
The digital signal component 203 is configured to convert the electric signal after filtering and amplifying into a digital signal, and process the digital signal to obtain a current and a central wavelength corresponding to an optical signal reflected by the fiber grating current sensor 100;
the digital signal component 203 is configured to convert the electrical signal processed by the electrical signal component 202 into a digital signal, and process the digital signal to obtain a current and a center wavelength corresponding to an optical signal reflected by the fiber grating current sensor 100, so as to obtain current parameter information of the power transmission line and the center wavelength of the corresponding fiber grating current sensor 100.
The fault diagnosis component 204 is configured to determine whether a fault occurs and a position of the fault according to the current and the center wavelength.
The fault diagnosis method comprises the following steps: comparing the current corresponding to the optical signal reflected by the fiber grating current sensor 100 with the historical current of the position where the fiber grating current sensor 100 is located, determining whether the current is a fault current, and determining the position of the fault according to the corresponding relationship between the center wavelength corresponding to the optical signal reflected by the fiber grating current sensor 100 and the installation position of the fiber grating current sensor 100 after determining that the current is the fault current.
The working principle of the fault location system based on the fiber grating current sensor 100 in the embodiment of the present application is as follows: when the power distribution network normally operates, the voltage and the current on the power transmission line are relatively stable, and the phenomenon of violent sudden change can not occur. However, when a power transmission line fails, especially when a single-phase ground fault occurs, the current near the fault point may suddenly change. Therefore, whether the power transmission line has a single-phase earth fault can be detected by detecting sudden change of current on the power transmission line, and the position information of a fault point can be obtained by further determining the position of the fiber grating current sensor 100 which detects the sudden change of current.
The present embodiment provides a fault location system based on fiber grating current sensor 100, including: the fiber grating current sensor 100 and the monitoring host 200, the monitoring host 200 includes: an optical signal component 201, an electrical signal component 202, a digital signal component 203, and a fault diagnosis component 204; wherein, the monitoring host 200 is connected with the fiber grating current sensor 100 through an optical fiber, the fiber grating current sensor 100 is installed on a cable, the optical signal component 201 transmits an optical signal to the fiber grating current sensor 100 through the optical fiber, the fiber grating current sensor 100 receives the optical signal, then reflects an optical signal back through the optical fiber according to the actual parameter value of the power transmission line, the optical signal reflected by the fiber grating current sensor 100 is transmitted to the optical signal component 201, the optical signal component 201 processes the reflected optical signal, the electrical signal component 202 converts the optical signal reflected by the fiber grating current sensor 100 after being processed by the optical signal component 201 into an electrical signal and performs filtering and amplifying processing, the digital signal component 203 converts the electrical signal processed by the electrical signal component 202 into a digital signal and processes the digital signal, the current and the center wavelength corresponding to the optical signal reflected by the fiber grating current sensor 100 are obtained, that is, the current parameter information of the power transmission line and the center wavelength corresponding to the fiber grating current sensor 100 are obtained, and the fault diagnosis component 204 determines whether a fault occurs and the position of the fault according to the current and the center wavelength.
The application provides a fault location system based on fiber grating current sensor 100 has adopted fiber grating current sensor 100, can real-time supervision transmission line's current information to timely discovery trouble, and according to fiber grating current sensor 100's position, the accurate position of acquireing the fault point. In addition, the fiber grating current sensor 100 adopted by the application has the advantages of accurate current information acquisition, strong anti-interference capability, good insulating property and no need of disconnecting a cable for installation, and meanwhile, the fiber grating current sensor 100 is a passive device, does not need external power supply, and is fast in response and high in sensitivity.
Referring to fig. 2, the optical signal assembly 201 includes: a broadband light source 2011, a semiconductor optical amplifier module 2012, an optical coupler 2013, an optical circulator 2014 and an arrayed waveguide grating module 2015;
the broadband light source 2011 is configured to provide an optical signal to the fiber grating current sensor 100;
the broadband light source 2011 may be customized according to actual requirements, for example, the broadband light source 2011 has a central wavelength of 1550nm, and a wavelength range that can selectively cover a C-band (1530nm to 1565nm) of optical fiber communication.
The semiconductor optical amplifier module 2012 is configured to amplify the optical signal output by the broadband light source 2011;
the wavelength response range of the semiconductor optical amplifier module 2012 needs to cover the output light wavelength range of the broadband light source 2011, and can be customized according to the wavelength range of the broadband light source 2011. Since the amplitude of the current anomaly is small in the case of a single-phase ground fault, the signal needs to be amplified.
The optical coupler 2013 is configured to divide the amplified optical signal into three paths, each of which serves as one of three phases of power, and transmit the three paths of optical signals to the fiber bragg grating current sensor 100;
the optical coupler 2013 may be a single-mode optical fiber coupler for optical fiber communication, or other optical couplers 2013 capable of achieving the same function may be used according to actual needs, and the application is not particularly limited.
The optical circulator 2014 is used for separating the amplified optical signal from the optical signal reflected by the fiber grating current sensor 100;
the optical circulator 2014 may be a single-mode optical fiber circulator for optical fiber communication, or may be other optical circulators 2014 capable of implementing the same function according to actual needs, which is not specifically limited in this application.
The arrayed waveguide grating module 2015 is configured to separate optical signals reflected by the fiber grating current sensor 100 according to different wavelengths.
The light splitting range of the arrayed waveguide grating module 2015 is to cover the central wavelength of the fiber grating current sensor 100, and can be customized according to the wavelength range of the fiber grating current sensor 100.
In this embodiment, the broadband light source 2011 is connected to the semiconductor optical amplifier module 2012, the semiconductor optical amplifier module 2012 is connected to one channel of the optical circulator, another channel of the optical circulator is connected to the arrayed waveguide grating module 2015, and the optical coupler 2013 is connected to the fiber grating current sensor 100 and also connected to the optical circulator 2014. The broadband light source 2011 firstly provides an optical signal, the semiconductor optical amplifier module 2012 amplifies the optical signal so that the fiber grating current sensor 100 can better identify, the amplified optical signal is divided into three paths by the optical coupler 2013 and respectively transmitted to the fiber grating current sensor 100 on each phase of the three-phase power, then the fiber grating current sensor 100 reflects the optical signal, the reflected optical signal passes through another channel of the optical circulator and is transmitted to the arrayed waveguide grating module 2015, and the optical signal reflected by the fiber grating current sensor 100 is separated according to different wavelengths.
Referring to fig. 3, the electrical signal assembly 202 includes: a photodetector array module 2021 and a multi-input filter amplifying circuit module 2022;
the photodetector array module 2021 is configured to convert the optical signals with different wavelengths output by the arrayed waveguide grating module 2015 into electrical signals;
the response wavelength of the photodetector array module 2021 should correspond to the sensor center wavelength one by one, and can be customized according to actual needs.
The multi-channel input filtering and amplifying circuit module 2022 is configured to perform filtering and amplifying processing on the multi-channel electrical signals with different wavelengths output by the photodetector array module 2021.
In this embodiment, the photodetector array module 2021 is connected to the arrayed waveguide grating module 2015, and is also connected to the multi-input filtering and amplifying circuit module 2022. The photodetector array module 2021 converts the optical signals with different wavelengths output by the arrayed waveguide grating module 2015 into electrical signals, and the multi-input filtering and amplifying circuit module 2022 performs filtering and amplifying processing on the electrical signals. Since the amplitude of the current anomaly is small in the case of a single-phase ground fault, the signal needs to be amplified.
Referring to fig. 4, the digital signal assembly 203 includes: a multi-input analog-to-digital conversion module 2031 and a digital signal processing unit module 2032.
The multi-input analog-to-digital conversion module 2031 is configured to convert the electrical signals output by the multi-input filtering and amplifying circuit module 2022 into digital signals;
the digital signal processing unit module 2032 is configured to process the digital signals output by the multiple input analog-to-digital conversion modules 2031 to obtain a current and a center wavelength corresponding to the optical signal reflected by the fiber grating current sensor 100.
In this embodiment, the multiple input analog-to-digital conversion module 2031 is connected to the multiple input filtering and amplifying circuit module 2022, and is also connected to the digital signal processing unit module 2032, the multiple input analog-to-digital conversion module 2031 converts the electrical signal output by the multiple input filtering and amplifying circuit module 2022 into a digital signal, and the digital signal processing unit module 2032 processes the digital signal to obtain the current and the center wavelength corresponding to the optical signal reflected by the fiber grating current sensor 100.
Referring to fig. 5, the fault diagnosis component 204 includes: an industrial personal computer module 2041;
the industrial personal computer module 2041 is configured to compare a current corresponding to an optical signal reflected by the fiber grating current sensor 100 with a historical current of a position where the fiber grating current sensor 100 is located, determine whether the current is a fault current, and determine a position where a fault occurs according to a correspondence between a center wavelength corresponding to the optical signal reflected by the fiber grating current sensor 100 and a position where the fiber grating current sensor 100 is installed after determining that the current is the fault current.
The diagnostic method of the industrial personal computer module 2041 is to compare the current with the historical current of the current position, determine the current as a fault current if the current is different from the historical current, and determine the position of the fault according to the position of the fiber grating current sensor 100.
Preferably, the monitoring host 200 is installed in a grid operation control center.
Preferably, the number of the fiber grating current sensors 100 is N, N is greater than or equal to 2, and N is an integer, and the wavelengths of the adjacent fiber grating current sensors 100 are different.
Preferably, the specific location of the fault is determined from adjacent fiber grating current sensors 100.
The fiber bragg grating current sensor with different central wavelengths is adopted, the installation position of the sensor corresponds to the central wavelength of the sensor, and the installation position of the sensor can be obtained by checking the central wavelength value at the output end of the sensor.
Referring to fig. 6, an embodiment of the present application provides a fault location method based on a fiber bragg grating current sensor, where the fault location method is applied to a fault location system of the fiber bragg grating current sensor, and the fault location method of the fiber bragg grating current sensor includes:
102, converting the processed optical signal reflected by the fiber bragg grating current sensor into an electric signal by an electric signal assembly, and carrying out filtering and amplifying processing;
103, converting the electric signal after filtering and amplifying into a digital signal by a digital signal assembly, and processing the digital signal to obtain a current and a central wavelength corresponding to an optical signal reflected by the fiber bragg grating current sensor;
and 104, judging whether a fault occurs and the position of the fault according to the current and the central wavelength by the fault diagnosis component.
In this embodiment, a fault location method based on a fiber grating current sensor includes: acquiring current information of a power transmission line, transmitting the current information to a monitoring host, comparing the current information with historical current of the position where a fiber grating current sensor is located, judging whether the current is fault current, and determining the position of a fault according to the position of the fiber grating current sensor if the current is the fault current.
In specific implementation, the present application further provides a computer storage medium, where the computer storage medium may store a program, and the program may include some or all of the steps in the embodiments of the fiber grating current sensor-based fault location method provided in the present application when executed. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).
Those skilled in the art will clearly understand that the techniques in the embodiments of the present application may be implemented by way of software plus a required general hardware platform. Based on such understanding, the technical solutions in the embodiments of the present application may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present application.
The same and similar parts in the various embodiments in this specification may be referred to each other. In particular, as for the method embodiment, since it is substantially similar to the system embodiment, the description is simple, and the relevant points can be referred to the description in the method embodiment.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (8)
1. A fiber grating current sensor based fault location system for single phase ground fault detection, the fault location system comprising:
monitoring host computer and fiber grating current sensor, the monitoring host computer includes: the device comprises an optical signal component, an electrical signal component, a digital signal component and a fault diagnosis component;
the monitoring host is connected with the fiber bragg grating current sensor through an optical fiber;
the fiber bragg grating current sensor is arranged on the cable and used for reflecting the received optical signals;
the optical signal assembly is used for providing an optical signal for the fiber bragg grating current sensor and processing the optical signal reflected by the fiber bragg grating current sensor;
the electrical signal assembly is used for converting the processed optical signal reflected by the fiber bragg grating current sensor into an electrical signal and carrying out filtering and amplifying processing;
the digital signal assembly is used for converting the electric signal after filtering and amplifying into a digital signal and processing the digital signal to obtain the current and the central wavelength corresponding to the optical signal reflected by the fiber bragg grating current sensor;
the fault diagnosis component is used for judging whether a single-phase earth fault occurs or not and the position of the fault according to the current and the central wavelength;
the fault diagnosis assembly comprises: an industrial personal computer module;
and the industrial personal computer module is used for comparing the current corresponding to the optical signal reflected by the fiber grating current sensor with the historical current of the position where the fiber grating current sensor is located, judging whether the current is a single-phase earth fault current or not, and determining the position of the single-phase earth fault according to the corresponding relation between the central wavelength corresponding to the optical signal reflected by the fiber grating current sensor and the installation position of the fiber grating current sensor after determining that the current is the fault current.
2. The fiber grating current sensor-based fault location system of claim 1,
the optical signal assembly includes: the device comprises a broadband light source, a semiconductor optical amplifier module, an optical coupler, an optical circulator and an array waveguide grating module;
the broadband light source is used for providing optical signals for the fiber bragg grating current sensor;
the semiconductor optical amplifier module is used for amplifying the optical signal output by the broadband light source;
the optical coupler is used for dividing the amplified optical signals into three paths which are respectively used as one of three phases of electricity, and respectively transmitting the three paths of optical signals to the fiber bragg grating current sensor;
the optical circulator is used for separating the amplified optical signal from the optical signal reflected by the fiber bragg grating current sensor;
the array waveguide grating module is used for separating optical signals reflected by the fiber grating current sensor according to different wavelengths.
3. The fiber grating current sensor-based fault location system of claim 2,
the electrical signal assembly includes: the photoelectric detector comprises a photoelectric detector array module and a multi-path input filtering and amplifying circuit module;
the photoelectric detector array module is used for converting optical signals with different wavelengths output by the arrayed waveguide grating module into electric signals;
and the multi-path input filtering and amplifying circuit module is used for filtering and amplifying the multi-path electric signals with different wavelengths output by the photoelectric detector array module.
4. The fiber grating current sensor-based fault location system of claim 3,
the digital signal assembly includes: the multi-channel input analog-to-digital conversion module and the digital signal processing unit module;
the multi-channel input analog-to-digital conversion module is used for converting the electric signals output by the multi-channel input filtering amplification circuit module into digital signals;
and the digital signal processing unit module is used for processing the digital signals output by the multi-channel input analog-to-digital conversion module to obtain the current and the central wavelength corresponding to the optical signals reflected by the fiber grating current sensor.
5. The fiber grating current sensor-based fault location system of claim 1,
the monitoring host is installed in a power grid operation control center.
6. The fiber grating current sensor-based fault location system of claim 1,
the number of the fiber grating current sensors is N, N is not less than 2, N is an integer, and the wavelengths of the adjacent fiber grating current sensors are different.
7. The fiber grating current sensor-based fault location system of claim 6, wherein the specific location of the fault is determined from adjacent fiber grating current sensors.
8. A fault location method based on a fiber grating current sensor, wherein the fault location method is applied to the fault location system of the fiber grating current sensor according to any one of claims 1 to 7, and the fault location method of the fiber grating current sensor comprises:
the optical signal assembly provides an optical signal for the fiber bragg grating current sensor and processes the optical signal reflected by the fiber bragg grating current sensor;
the electrical signal assembly converts the processed optical signal reflected by the fiber bragg grating current sensor into an electrical signal and performs filtering and amplification processing;
the digital signal assembly converts the electric signal after filtering and amplifying into a digital signal, and acquires the current and the central wavelength corresponding to the optical signal reflected by the fiber bragg grating current sensor by processing the digital signal;
the fault diagnosis component judges whether the single-phase earth fault occurs or not and the position of the fault according to the current and the central wavelength, and the fault diagnosis component comprises: and the fault diagnosis component compares the current corresponding to the optical signal reflected by the fiber grating current sensor with the historical current of the position where the fiber grating current sensor is located, judges whether the current is a single-phase earth fault current, and determines the position of the single-phase earth fault according to the corresponding relation between the central wavelength corresponding to the optical signal reflected by the fiber grating current sensor and the installation position of the fiber grating current sensor after determining that the current is the fault current.
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| CN201811002456.6A CN109031048B (en) | 2018-08-30 | 2018-08-30 | Fault positioning system and method based on fiber bragg grating current sensor |
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| CN201811002456.6A CN109031048B (en) | 2018-08-30 | 2018-08-30 | Fault positioning system and method based on fiber bragg grating current sensor |
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| CN109031048B true CN109031048B (en) | 2021-07-13 |
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