CN214067309U - Positioning device for medium-voltage cable fault based on FDR - Google Patents
Positioning device for medium-voltage cable fault based on FDR Download PDFInfo
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- CN214067309U CN214067309U CN202022629354.6U CN202022629354U CN214067309U CN 214067309 U CN214067309 U CN 214067309U CN 202022629354 U CN202022629354 U CN 202022629354U CN 214067309 U CN214067309 U CN 214067309U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The utility model relates to a positioning device for medium voltage cable fault based on FDR, which comprises a high frequency signal source arranged at the head end of a tested cable, a power divider connected with the high frequency signal source, a coupler circuit connected with the first branch of the power divider, a signal processor connected with the second branch of the power divider, and a data processing unit connected with the signal processor; the high-frequency signal source generates a high-frequency signal with a set frequency and sends the high-frequency signal to the power divider; the power divider divides the high-frequency signal energy into an incident signal and a standard signal; the incident signal is coupled to the tested cable through the coupler circuit, and the standard signal is output to the signal processor; the coupler circuit is coupled with the tested cable, receives the reflected signal of the tested cable and transmits the reflected signal to the signal processor; the signal processor sends the standard signal and the reflected signal to the data processing unit. The problem of unable detection and location when having solved nuclear power plant's medium voltage cable and breaking down is solved, the utility model discloses can detect and fix a position the higher high resistance trouble of frequency of occurrence.
Description
Technical Field
The utility model relates to a cable fault location technical field, more specifically say, relate to a positioner of middling pressure cable fault based on FDR.
Background
The medium voltage cable in the nuclear power plant lays the path length and complicated usually, in case be difficult to look for and fix a position when insulating low fault takes place, in order to effectively reduce the economic loss who causes because of the whole change, need develop a cable defect/fault location technique suitable for the nuclear power plant, can find the weak position of cable fast, provide the guarantee for follow-up fixed point repair work.
At present, in the field of nuclear power, no effective cable fault detection method and distance measurement scheme exist for medium-voltage cables. In other projects, most widely used power cable diagnosis methods are pulse reflection measurement methods of traveling waves, such as low-voltage pulse reflection method, also called time domain reflection method (TDR).
The measurement principle is as follows: when the cable breaks down, pour into a low pressure pulse signal into at the cable head end, the signal takes place to return at the impedance mismatch department of fault point and penetrates the phenomenon, sets up signal receiver at the cable head end to record the signal waveform in the time domain that reflects back. And calculating the distance L between the fault and the head end of the cable by calculating the time difference Deltat between the injected signal and the reflected signal and the speed v of the electromagnetic wave in the cable.
L=V*△t/2
However, this detection technique has the following disadvantages: only low-resistance faults and open-circuit faults with low occurrence frequency can be detected, and high-resistance faults with occurrence frequency exceeding 80% cannot be detected; due to the existence of the pulse width, a detection blind area exists in the low-voltage pulse reflection method, when the cable is short or a fault point is close to the head end, an accurate measurement result cannot be obtained, and the measurement precision is low; the method is sensitive to signal noise and weak in anti-interference capability.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, a positioner of middling pressure cable fault based on FDR is provided.
The utility model provides a technical scheme that its technical problem adopted is: the positioning device for the medium-voltage cable fault based on the FDR is constructed and comprises a high-frequency signal source arranged at the head end of a tested cable, a power divider connected with the high-frequency signal source, a coupler circuit connected with a first branch of the power divider, a signal processor connected with a second branch of the power divider, and a data processing unit connected with the signal processor;
the high-frequency signal source generates a high-frequency signal with a set frequency and sends the high-frequency signal to the power divider; the power divider divides the high-frequency signal energy into an incident signal and a standard signal; the incident signal is coupled to the tested cable through a coupler circuit, and the standard signal is output to the signal processor; the coupler circuit is coupled with the tested cable, receives the reflection signal of the tested cable and transmits the reflection signal to the signal processor; and the signal processor sends the standard signal and the reflected signal to the data processing unit.
Preferably, the high-frequency signal source is a variable-frequency high-frequency signal generator, and the transmitting frequency range of the high-frequency signal generator is 200kHz-1 GHz.
Preferably, a filter circuit is further disposed between the high-frequency signal source and the power divider.
Preferably, the power divider comprises resistors R2, R3, R4, R5 and R6, wherein the resistors R2 and R3 are output to the coupler circuit in series; the resistors R4 and R5 are output to the signal processor in series; the two ends of the resistor R6 are respectively connected between the resistors R2 and R3 and between the resistors R4 and R5.
Preferably, the resistance value of the resistor R2 is equal to the resistance value of the resistor R4, and the resistance value of the resistor R3 is equal to the resistance value of the resistor R5.
Preferably, the coupler circuit includes a first coupler T1 and a second coupler T2; the first coupler T1 detects the incident signal output to the cable under test; the second coupler T2 detects the reflected signal on the cable under test.
Preferably, the signal processor is an a/D data processing circuit, and converts the detected electromagnetic wave signal into a digital signal and outputs the digital signal to the data processing unit.
Preferably, the positioning device further comprises a geographic data information unit connected with the data processing unit.
Preferably, the positioning device further comprises a data storage unit connected with the geographic data information unit.
Preferably, the positioning device further comprises a display and control panel connected to the data processing unit.
Implement the utility model discloses following beneficial effect has at least: the problem of unable detection and location when having solved the medium voltage cable trouble of nuclear power plant is compared in the low pressure pulse reflection method, the utility model discloses can detect and fix a position the higher high resistance trouble of frequency of occurrence. The FDR measurement is only related to the frequency value of each antinode or node of the standing wave, and is insensitive to noise in actual engineering, so that the FDR has stronger anti-interference capability.
Furthermore, by combining a Geographic Information System (GIS) and an FDR method, the fault point of the cable can be quickly positioned, information such as the distance of the fault point, the room number, the equipment position and the like can be provided for maintenance personnel in time, the fault troubleshooting time is shortened, and the safety and the economy of the nuclear power station are improved;
visualization of cable fault position information is achieved through a three-dimensional image of a geographic position of a GIS;
the medium-voltage cable in the nuclear power plant has the characteristics of short power transmission distance and few intermediate joints, and can reduce the interference of the intermediate joints on measurement signals and reduce the attenuation degree of the measurement signals. Therefore, when the FDR technology is applied to the field of nuclear power, the fault position can be more accurately positioned, and the measurement error is reduced.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic block diagram of an FDR-based medium voltage cable fault location apparatus in accordance with some embodiments of the present invention;
FIG. 2 is a schematic representation of standing waves of the FDR process;
fig. 3 is a schematic circuit diagram of a FDR-based medium voltage cable fault location apparatus according to some embodiments of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1-3 illustrate some preferred embodiments of the FDR-based medium voltage cable fault location apparatus of the present invention. The positioning device comprises a high-frequency signal source 11, a power divider 12, a coupler circuit 13, a signal processor 14, a data processing unit 15 and the like; further, a geographic data information unit 16, a data storage unit 17, a display and control panel 18, and the like may also be provided as necessary. The positioning of medium voltage cable faults is realized by the FDR method (frequency domain reflection method).
The FDR method is characterized in that a fixed stepping sweep frequency signal in a certain frequency range is transmitted to the head end of a tested cable, and if a fault point exists in the cable, due to impedance mismatching of the fault point, an incident signal generates a reflected wave at the impedance mismatching position. At this time, a standing wave in which two waveforms are superimposed can be detected at the leading end position, and the fault distance can be obtained from the frequency difference Δ f between adjacent antinodes (or nodes) of the standing wave (as shown in fig. 2) and the propagation velocity V of the wave in the cable:
L=V/（2*△f）
the high frequency signal source 11 is a variable frequency high frequency signal generator 111, and the transmitting frequency range thereof is 200kHz-1 GHz. When the detection is needed, the data processing unit 15 outputs the frequency range and the stepping speed, and the high-frequency signal generator 111 injects a fixed stepping frequency wave into the cable to be detected.
As shown in fig. 3, the high-frequency signal emitted from the high-frequency signal source 11 passes through a filter circuit, which is composed of a resistor R1 and a capacitor C1, and the high-frequency signal emitted from the high-frequency signal source 11 passes through the filter circuit and then enters the power divider 12.
As shown in fig. 3, the power divider 12 includes resistors R2, R3, R4, R5, and R6, wherein the resistors R2 and R3 are serially output to the coupler circuit 13; the resistors R4 and R5 are output in series to the signal processor 14; the two ends of the resistor R6 are respectively connected between the resistors R2 and R3 and between the resistors R4 and R5. The resistance of the resistor R2 is equal to the resistance of the resistor R4, and the resistance of the resistor R3 is equal to the resistance of the resistor R5. It can be understood that the resistance value can be adjusted according to actual needs.
The high-frequency signal energy input into the power divider 12 is divided into two paths, one path is input into the coupler circuit 13 and finally enters into the tested cable; the other path is output to the signal processor 14 for processing.
The coupler circuit 13 includes a first coupler T1 and a second coupler T2; the first coupler T1 detects the incident signal output to the tested cable, including current signal, waveform information, etc.; the second coupler T2 detects the reflection signal on the cable under test, including the reflection waveform information, etc.
The signal processor 14 is an a/D data processing circuit 141, and converts the detected electromagnetic wave signal into a digital signal and outputs the digital signal to the data processing unit 15.
Furthermore, the geographic data information of the tested cable of the power plant can be recorded in advance through a geographic data information unit 16 (GIS unit), a three-dimensional model of the geographic position of the cable is established, and data storage can be carried out through a data storage unit 17 connected with the three-dimensional model. The data processing unit 15 sends the calculation result of the fault position to the GIS unit, and the calculation result is compared with the geographic data in the GIS unit, so that the fault point of the cable can be quickly positioned, information such as the distance of the fault point, the room number and the equipment position can be provided for maintenance personnel in time, the fault troubleshooting time is shortened, and the safety and the economy of the nuclear power station are improved.
The display and control panel 18 is connected with the data processing unit 15 and can display cable fault information, and real-time paths, fault positions, early warning information, three-dimensional images and the like of cable faults can be displayed on the display panel through analysis of the GIS module, so that maintenance personnel can conveniently judge the fault positions. The calling control panel 18 can set and control the parameters of the fault location device.
When the positioning device is used for positioning faults of the medium-voltage cable, the high-frequency signal source 11 generates a high-frequency signal with a set frequency and sends the high-frequency signal to the power divider 12;
the power divider 12 divides the high-frequency signal energy into an incident signal and a standard signal; the incident signal is coupled to the tested cable through the coupler circuit 13, and the standard signal is output to the signal processor 14;
the coupler circuit 13 is coupled with the tested cable, receives the reflected signal of the tested cable and transmits the reflected signal to the signal processor 14;
the signal processor 14 converts the standard signal and the reflected signal into digital signals and sends the digital signals to the data processing unit 15. The data processing unit 15 analyzes the digital information, calculates a frequency difference Δ f, a fault type, a fault distance, and the like, and simultaneously transmits the analysis result to the display panel, the data storage, and the GIS unit.
The positioning device adopting the embodiment at least has the following advantages: the problem that the medium-voltage cable of the nuclear power plant cannot be detected and positioned when the medium-voltage cable breaks down is solved, and compared with a low-voltage pulse reflection method, the utility model can detect and position high-resistance faults with higher frequency;
the FDR measurement is only related to the frequency value of each antinode or node of the standing wave, and is insensitive to noise in actual engineering, so that the FDR has stronger anti-interference capability;
by combining a Geographic Information System (GIS) and an FDR method, the fault point of the cable can be quickly positioned, information such as the distance of the fault point, the room number, the equipment position and the like can be provided for maintenance personnel in time, the troubleshooting time is shortened, and the safety and the economy of the nuclear power station are improved;
visualization of cable fault position information is achieved through a three-dimensional image of a geographic position of a GIS;
the medium-voltage cable in the nuclear power plant has the characteristics of short power transmission distance and few intermediate joints, and can reduce the interference of the intermediate joints on measurement signals and reduce the attenuation degree of the measurement signals. Therefore, when the FDR technology is applied to the field of nuclear power, the fault position can be more accurately positioned, and the measurement error is reduced.
It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. An FDR-based positioning device for medium-voltage cable faults is characterized by comprising a high-frequency signal source arranged at the head end of a tested cable, a power divider connected with the high-frequency signal source, a coupler circuit connected with a first branch of the power divider, a signal processor connected with a second branch of the power divider, and a data processing unit connected with the signal processor;
the high-frequency signal source generates a high-frequency signal with a set frequency and sends the high-frequency signal to the power divider; the power divider divides the high-frequency signal energy into an incident signal and a standard signal; the incident signal is coupled to the tested cable through a coupler circuit, and the standard signal is output to the signal processor; the coupler circuit is coupled with the tested cable, receives the reflection signal of the tested cable and transmits the reflection signal to the signal processor; and the signal processor sends the standard signal and the reflected signal to the data processing unit.
2. An FDR-based medium voltage cable fault location device as claimed in claim 1, wherein said high frequency signal source is a variable frequency high frequency signal generator having a transmission frequency range of 200kHz-1 GHz.
3. An FDR-based medium voltage cable fault location apparatus as claimed in claim 2, wherein a filter circuit is further provided between said high frequency signal source and said power divider.
4. An FDR-based medium voltage cable fault location apparatus as claimed in claim 1 wherein said power splitter includes resistors R2, R3, R4, R5, R6, wherein resistors R2 and R3 are output in series to said coupler circuit; the resistors R4 and R5 are output to the signal processor in series; the two ends of the resistor R6 are respectively connected between the resistors R2 and R3 and between the resistors R4 and R5.
5. An FDR-based medium voltage cable fault location device as claimed in claim 4 wherein said resistor R2 has a resistance equal to the resistance of resistor R4 and said resistor R3 has a resistance equal to the resistance of resistor R5.
6. An FDR-based medium voltage cable fault location device as claimed in claim 1 wherein said coupler circuit includes a first coupler T1 and a second coupler T2; the first coupler T1 detects the incident signal output to the cable under test; the second coupler T2 detects the reflected signal on the cable under test.
7. An FDR-based medium voltage cable fault location device as claimed in claim 1, wherein said signal processor is an a/D data processing circuit, converts the detected electromagnetic wave signal into a digital signal and outputs it to said data processing unit.
8. An FDR-based medium voltage cable fault location device according to any of the claims 1-7, characterized in that said location device further comprises a geographical data information unit connected to said data processing unit.
9. An FDR-based medium voltage cable fault location device as recited in claim 8 wherein said location device further comprises a data storage unit connected to said geographic data information unit.
10. An FDR-based medium voltage cable fault location device according to any of the claims 1-7, further comprising a display and control panel connected to the data processing unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022629354.6U CN214067309U (en) | 2020-11-13 | 2020-11-13 | Positioning device for medium-voltage cable fault based on FDR |
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| CN202022629354.6U CN214067309U (en) | 2020-11-13 | 2020-11-13 | Positioning device for medium-voltage cable fault based on FDR |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114414947A (en) * | 2022-01-05 | 2022-04-29 | 四川大学 | Head end impedance matching method suitable for FDR test and cable impedance mismatching position reflection state evaluation method |
| CN114895148A (en) * | 2022-05-23 | 2022-08-12 | 杭州迅基信息科技有限公司 | Distribution network line fault positioning method and system based on frequency domain reflection technology |
-
2020
- 2020-11-13 CN CN202022629354.6U patent/CN214067309U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114414947A (en) * | 2022-01-05 | 2022-04-29 | 四川大学 | Head end impedance matching method suitable for FDR test and cable impedance mismatching position reflection state evaluation method |
| CN114414947B (en) * | 2022-01-05 | 2023-05-09 | 四川大学 | Head-end impedance matching method and cable impedance mismatch position reflection state evaluation method suitable for FDR test |
| CN114895148A (en) * | 2022-05-23 | 2022-08-12 | 杭州迅基信息科技有限公司 | Distribution network line fault positioning method and system based on frequency domain reflection technology |
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