CN212723181U - Cable fault on-line detection and positioning device based on shield layer grounding wire coupling - Google Patents
Cable fault on-line detection and positioning device based on shield layer grounding wire coupling Download PDFInfo
- Publication number
- CN212723181U CN212723181U CN202021375630.4U CN202021375630U CN212723181U CN 212723181 U CN212723181 U CN 212723181U CN 202021375630 U CN202021375630 U CN 202021375630U CN 212723181 U CN212723181 U CN 212723181U
- Authority
- CN
- China
- Prior art keywords
- signal
- cable
- fault
- detection
- coupler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 47
- 230000008878 coupling Effects 0.000 title claims abstract description 28
- 238000010168 coupling process Methods 0.000 title claims abstract description 28
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 28
- 238000012790 confirmation Methods 0.000 claims abstract 2
- 238000004891 communication Methods 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 8
- 230000001939 inductive effect Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims description 4
- 230000004807 localization Effects 0.000 claims 1
- 238000009826 distribution Methods 0.000 abstract description 9
- 238000001228 spectrum Methods 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000001028 reflection method Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000003750 conditioning effect Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 229910001053 Nickel-zinc ferrite Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Images
Landscapes
- Locating Faults (AREA)
Abstract
The utility model discloses a cable fault on-line measuring and positioner based on shield layer grounding wire coupling mainly includes marginal platform equipment and signal coupler two parts and constitutes. The edge platform equipment consists of a display screen, a power key, an up-shift key, a down-shift key, a left-shift key, a right-shift key, a confirmation key, a signal wire connection port, an upper computer connection port, a shell and an internal mainboard. The device carries out signal non-contact coupling on a cable terminal shielding layer grounding wire, carries out real-time online detection on the cable by utilizing the principle of a spread spectrum time domain reflection method, can directly check a detection result from a screen of edge platform equipment on a working site, and can also check the detection result at a far end through a network. The utility model discloses have on-line measuring, non-contact coupling, the degree of accuracy is high, detection speed is fast, the interference killing feature is strong and remote monitoring's advantage, be applicable to distribution network cable's fault detection and location, can effectively assist the maintainer to confirm the fault point, improve the automation level of work efficiency and distribution network.
Description
Technical Field
The utility model relates to a cable fault on-line measuring and positioner belongs to cable fault detection field.
Background
With the continuous improvement of the living standard of people, the power consumption demand is increased, so that the scale of the power grid is further enlarged. In an electric power system, a power distribution network distributes electric energy of a transmission network to users, and has an important role in starting and stopping. In recent years, urban construction is rapidly developed, and the cable more meets the urban construction requirements in the aspects of reliable power supply, beautiful city, land saving and the like. Therefore, the number of cables in the urban power distribution network is increased, and the cables are laid more densely. The cable is used as an electric power operation carrier, and the safe operation of the cable is an important factor for determining the safety and stability of the power distribution network.
The cables are usually laid underground in a direct-buried manner, in a pipe-drawing manner or in a pipeline manner. In long-term operation, due to insulation aging, external force damage and the influence of the laying environment (high temperature, moisture and corrosion), insulation defects of a cable body or accessories are caused, insulation is finally broken down, and faults such as grounding, short circuit and disconnection of a power distribution network are caused. The cable can not be like an overhead line, the specific situation of the underground operation part can be intuitively patrolled, and the difficulty of troubleshooting is increased. The long-time power failure caused by the fault causes loss to industrial production and inconvenience to the life of residents. Therefore, the cables in the power distribution network need to be timely and effectively subjected to fault detection and positioning, repaired and restored to supply power as soon as possible.
The detection of the cable fault adopted at present generally comprises four steps of fault analysis, prepositioning, accurate positioning and cable identification. The method mainly comprises a bridge method, a distributed parameter method, a low-voltage pulse reflection method, a pulse voltage method, a pulse current method, a secondary pulse method and a tertiary pulse method. The methods are used for detecting under the condition of power failure, are relatively complex in operation, cannot monitor cable faults in real time, and prolong the power failure time. The spread spectrum time domain reflection method takes a spread spectrum signal as a detection signal, adopts a spread spectrum method of pseudo-random sequence and sine carrier modulation, has excellent correlation characteristic of the spread spectrum signal, has less frequency spectrum overlap with a low-frequency power signal, and can realize online detection.
The effective coupling of the detection signal to the cable is a precondition for realizing the on-line detection of the cable. Due to the special working environment, the structure of the cable is much more complicated than that of an overhead line. Taking a commonly used 10kv armored cable as an example, the cable structure comprises a conductor, an inner semi-conducting layer, an insulating layer, an outer semi-conducting layer, a metal shielding layer, a filler, a wrapping tape, an inner sheath, an armor layer and an outer sheath. The complex structure of the cable increases the signal coupling difficulty of the actual site, and further limits the on-line detection of the cable.
To sum up, off-line detection of power distribution network cable faults spends a lot of time and manpower in finding fault points, reduces maintenance work efficiency, increases power failure loss, and influences power supply reliability. The complex structure of the cable increases the difficulty of on-line detection signal coupling.
Disclosure of Invention
The utility model discloses the problem that will solve is: aiming at the defects of cable off-line detection and the problem of signal coupling of a complex cable structure in the prior art, the power distribution network cable fault on-line detection and positioning device based on shielding layer grounding wire coupling is provided.
The utility model adopts the following technical scheme:
a cable fault on-line detection and positioning device based on shield layer grounding wire coupling is characterized by mainly comprising an edge platform device and a signal coupler; the edge platform equipment consists of a shell and an internal mainboard, wherein the shell is provided with a signal wire connection port for connecting the internal mainboard with a signal coupler; the mainboard takes the FPGA as a control core, and is peripherally provided with a power supply module, an AD module, a DA module, an isolation coupling module, a high-speed clock signal module and a wireless communication module; the signal coupler is arranged on the side of a ground wire of a shielding layer of a tested cable terminal, and the ground wire of the shielding layer penetrates through the signal coupler to be grounded; the detection signal that the mainboard sent carries out signal non-contact coupling at cable termination shielding layer grounding through signal coupler, and detection signal takes place the reflection at the fault point, and signal coupler separates out the reflection signal, reaches the mainboard, and FPGA handles reflection signal based on edge calculation, draws fault type and fault distance information.
The utility model has the advantages that:
(1) the cable terminal shielding layer is connected with the ground wire to carry out signal non-contact coupling without damaging the original structure of the cable;
(2) the cable is detected on line under the condition of no power failure;
(3) by adopting edge calculation, the cable fault is rapidly detected and positioned in real time, and the power failure time is effectively reduced;
(4) working parameters are adjusted through equipment keys or a remote monitoring platform, so that the cable monitoring device can adapt to cables of different models;
(5) the display screen displays the working state and the detection result of the detection system in real time, so that the working personnel can conveniently check the working state and the detection result on site;
(6) the wireless communication module transmits the fault information to the gateway, and the gateway transmits the fault information to the remote monitoring center through the broadband network, so that the working state and the detection result of the detection system can be remotely checked, and the working efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a structural diagram of a cable on-line monitoring system according to the present invention;
fig. 3 is a block diagram of a system hardware configuration.
Detailed Description
The utility model provides a cable fault on-line measuring and positioner based on shield layer grounding wire coupling.
Fig. 1 is the structure diagram of the utility model, which includes 1 display screen, 2 shells, 3 left shift keys, 4 up shift keys, 5 right shift keys, 6 enter keys, 7 down shift keys, 8 power keys, 9 signal line wiring ports, 10 signal lines, 11 signal couplers, 12 upper computer wiring ports. The display screen 1, the left shift key 3, the up shift key 4, the right shift key 5, the enter key 6, the down shift key 7, the power key 8, the signal line interface 9 and the upper computer interface 12 are arranged on the shell 2. The inside mainboard that is of shell mainly includes power module, FPGA minimum system module, AD module, DA module, isolation coupling module, high-speed clock signal module and wireless communication module. In an actual working site, a power key 8 is used for connecting the device, the display screen 1 displays working parameters and detection results of the device, and commands are input through keys 3, 4, 5, 6 and 7. Signal line port 9 provides a 4-way port so that the device can detect 4 cables. The signal line 10 is connected between the edge platform device and the signal coupler by using a coaxial cable. The signal coupler 11 is installed on the ground wire side of the terminal shielding layer of the tested cable, so that the ground wire passes through the signal coupler 11, and non-contact coupling of the detection signal is realized. The upper computer wiring port 12 is connected with an upper computer and used for data reading, internal parameter modification and system upgrading of the device.
Fig. 3 is a block diagram of a system hardware circuit configuration.
In the power supply module, working voltage needs to be provided for the FPGA and other various hardware. According to the requirements of the device on a power supply, linear voltage regulators ADP3339-1.8-RL and ADP3339-3.3-RL are adopted to output 1.8V and 3.3V respectively; the charge pump inverter MAX889T outputs-5V; the synchronous buck current mode converters TPS54618, TPS54318, TPS75725 output 1.1V, 1.9V and 2.5V respectively.
The high-speed clock signal module is composed of a clock chip CDCE62002 and a peripheral circuit, and outputs 2 paths of 500Mhz high-frequency clock signals to the AD chip and the DA chip respectively.
The FPGA minimum system module is composed of an FPGA, a clock circuit, a reset circuit and a configuration circuit, wherein the clock circuit, the reset circuit and the configuration circuit provide a working clock, a reset signal and configuration management for the FPGA, and the FPGA can work normally. The FPGA is internally provided with an NIOS II soft-core processor which is mainly used for generating digital spread spectrum detection signals, synchronously caching the detection signals and reflection signals, communicating with a wireless communication module, configuring internal clock signals, receiving key input, controlling display screen display and performing cross-correlation operation.
The DA module comprises a DA chip AD9734, a peripheral configuration circuit and a DA output signal conditioning circuit. And configuring the level of a corresponding DA control pin through a peripheral configuration circuit, setting the working mode of the DA, and realizing the control of the DA. Because the AD9734 is differential output, in the DA output signal conditioning circuit, a radio frequency transformer ADT1-1WT is firstly adopted to be converted into single-ended output, and then an AD8045 operational amplifier is used to construct a circuit with primary following and secondary amplification, so that the amplitude of an output signal can be adjusted.
The AD module comprises an AD chip ADC08D500, a peripheral configuration circuit and an AD input signal conditioning circuit. And the level of the corresponding AD control pin is configured through the peripheral configuration circuit, the working mode of the AD is set, and the AD is controlled. In the present invention, the input range of the AD is set to 650mVP-P at the maximum. In the AD input signal conditioning circuit, a first-stage following and second-stage amplifying circuit is constructed by using an AD8045 operational amplifier, and the input signal is adjusted to be within the input range of the AD. Since the ADC08D500 adopts a differential input form, a radio frequency transformer ADT1-1WT is used after the amplification circuit to convert the single-ended signal into a differential signal, which is input to the ADC08D 500.
The keys and the display screen on the shell form a man-machine interaction module in the figure, and mainly realize the input of the keys, the display of working states and detection results. The display screen adopts a 12864 liquid crystal display screen and mainly displays the working state, the fault length, the signal propagation speed and the fault type.
The wireless communication module adopts an LoRa module Ra-02, is connected with the FPGA through a UART, receives instructions of the FPGA, and transmits data to a remote server through an LoRa wireless network.
The isolation coupling module mainly comprises an isolation transformer ADT4-6, a high voltage resistant capacitor (1nF), a TVS (transient suppression diode) GBLC12C and a voltage regulator GBLC5C, wherein the voltage regulator GBLC5C and the TVS (transient suppression diode) GBLC12C are respectively connected in parallel to the input side and the output side of the isolation transformer, and the high voltage resistant capacitor is connected in series to the output end. The detection signal is coupled to the external signal line, and the reflected signal is received from the external signal line, so that the isolation protection effect is achieved.
The signal coupler is a circular inductive coupler (the embodiment adopts an inductive coupler of a ReyKa electrical model RK-DG 100A), and the inductive coupler adopts nickel-zinc ferrite as a magnetic core and consists of two semicircular rings. The shielding layer grounding wire is used as a primary coil to penetrate through the signal coupler, and the built-in secondary coil is wound on the magnetic core of the coupler and is used as a signal output end, is externally connected with a signal wire and is connected to the output end of the isolation coupling module on the edge platform equipment mainboard through a signal wire interface.
FIG. 2 is a structural diagram of a cable on-line monitoring system according to the present invention; the cable on-line monitoring system includes: cable fault on-line measuring and positioner, gateway and surveillance center based on shield layer grounding wire coupling will the utility model discloses install in the switch board, make the shield layer grounding wire that is surveyed the cable terminal pass from signal coupler. The whole system works as follows: in the edge platform equipment, a main board sends out a detection signal, signal non-contact coupling is carried out on a ground wire of a cable terminal shielding layer through a signal coupler, and the detection signal is reflected at a fault point. And separating the reflected signal from the signal coupler, transmitting the reflected signal to a mainboard of the edge platform equipment, processing the reflected signal in the mainboard based on edge calculation, extracting fault type and fault distance information, and displaying a detection result on a display screen. The wireless communication module transmits the detection result to the gateway, and the gateway transmits the detection information of the detection devices distributed at different positions to the remote monitoring center through the broadband network.
Claims (5)
1. A cable fault on-line detection and positioning device based on shield layer grounding wire coupling is characterized by mainly comprising an edge platform device and a signal coupler; the edge platform equipment consists of a shell and an internal mainboard, wherein the shell is provided with a signal wire connection port for connecting the internal mainboard with a signal coupler; the mainboard takes the FPGA as a control core, and is peripherally provided with a power supply module, an AD module, a DA module, an isolation coupling module, a high-speed clock signal module and a wireless communication module; the signal coupler is arranged on the side of a ground wire of a shielding layer of a tested cable terminal, and the ground wire of the shielding layer penetrates through the signal coupler to be grounded; the detection signal that the mainboard sent carries out signal non-contact coupling at cable termination shielding layer grounding through signal coupler, and detection signal takes place the reflection at the fault point, and signal coupler separates out the reflection signal, reaches the mainboard, and FPGA handles reflection signal based on edge calculation, draws fault type and fault distance information.
2. The shield-layer ground-wire coupling based cable fault on-line detection and localization apparatus of claim 1, wherein said signal line is a coaxial cable and said signal line interface comprises a plurality of interfaces.
3. The shielding layer ground wire coupling-based cable fault on-line detection and positioning device as claimed in claim 1, wherein the wireless communication module adopts an LoRa module, is connected with the FPGA through a UART, receives an instruction of the FPGA, and transmits data to the remote monitoring center through an LoRa wireless network.
4. The apparatus for on-line detection and location of cable fault based on shield layer ground wire coupling as claimed in claim 1, wherein said signal coupler is a circular ring type inductive coupler, the shield layer ground wire is used as a primary coil to pass through the signal coupler, a secondary coil built in the inductive coupler is wound around the magnetic core of the coupler, used as a signal output terminal, externally connected to the signal wire, and connected to the main board of the edge platform device by the signal wire interface.
5. The shielding layer ground wire coupling based cable fault on-line detection and positioning device of claim 1, wherein a display screen, a power key, an up shift key, a down shift key, a left shift key, a right shift key, a confirmation key and an upper computer wiring port which are electrically connected with the internal main board are arranged on the housing; the display screen displays the working state and the detection result of the device in real time; the power key is used for connecting a power supply to the device; the up shift key, the down shift key, the left shift key, the right shift key and the enter key are used for inputting instructions; and the upper computer wiring port is used for connecting an upper computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021375630.4U CN212723181U (en) | 2020-07-14 | 2020-07-14 | Cable fault on-line detection and positioning device based on shield layer grounding wire coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021375630.4U CN212723181U (en) | 2020-07-14 | 2020-07-14 | Cable fault on-line detection and positioning device based on shield layer grounding wire coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212723181U true CN212723181U (en) | 2021-03-16 |
Family
ID=74983563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021375630.4U Active CN212723181U (en) | 2020-07-14 | 2020-07-14 | Cable fault on-line detection and positioning device based on shield layer grounding wire coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212723181U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114397548A (en) * | 2022-03-28 | 2022-04-26 | 广东电网有限责任公司惠州供电局 | Cable insulation state detection system and method based on FPGA chip |
-
2020
- 2020-07-14 CN CN202021375630.4U patent/CN212723181U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114397548A (en) * | 2022-03-28 | 2022-04-26 | 广东电网有限责任公司惠州供电局 | Cable insulation state detection system and method based on FPGA chip |
| WO2023185311A1 (en) * | 2022-03-28 | 2023-10-05 | 广东电网有限责任公司惠州供电局 | Cable insulation state detection system and method employing fpga chip |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102590670B (en) | High voltage cable smart grounding box | |
| CN103293443A (en) | Overhead wire grounding fault locating method for power distribution network | |
| CN103235168B (en) | Measuring system for shunt vectors of metal frames of large ground grids on basis of wireless transmission | |
| CN102129018A (en) | Insulation online monitoring method for high-voltage capacitive equipment | |
| CN103163561A (en) | Cable path electriferous probing method and device | |
| CN105158643A (en) | Remote control detecting device for corrosion state of grounding grid horizontal voltage-sharing conductor of substation | |
| CN107478909A (en) | A kind of smart grounding resistance on-line computing model and its system | |
| CN212723181U (en) | Cable fault on-line detection and positioning device based on shield layer grounding wire coupling | |
| CN103389437A (en) | Device and method for monitoring shielding current of secondary control cable of transformer substation in real time | |
| CN207074234U (en) | A kind of ultra-high-tension power transmission line power frequency parameter measuring system of frequency conversion strong anti-interference | |
| CN216485329U (en) | Cable health monitoring device | |
| CN103616616A (en) | Fault detection method for large-scale grounding grid | |
| CN203311010U (en) | Buried wire cable testing instrument | |
| CN203259663U (en) | Cable route electrification detection device | |
| CN206773053U (en) | A kind of novel intelligent wireless monitoring device for cross connection grounding | |
| CN203561722U (en) | Two-frequency signal detection position indicator for electricity overhead line | |
| CN116930684A (en) | System and method for monitoring state of seabed high-voltage cable of offshore wind farm | |
| CN205139294U (en) | Ground net corrodes situation testing arrangement based on wireless sensor network | |
| CN107462760A (en) | A kind of high-voltage switch gear transient state earth testing system being used under forceful electric power magnetic environment | |
| CN108646301A (en) | A kind of detection method and detection device in low-voltage cable path | |
| CN102231571A (en) | Ground wire on-line monitor system | |
| CN202794417U (en) | Sensing and transforming integrated device for transformer iron core grounding monitoring | |
| CN101762756B (en) | Laser pump-based online monitoring system for power equipment running state | |
| CN210109247U (en) | Optical fiber sensing long-distance lightning stroke positioning device based on power system intranet | |
| CN204989391U (en) | Horizontal voltage -sharing conductor etch state remote control detection device of substation grounding grid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |