CN112202473A - Cable fault detection device based on power line carrier - Google Patents
Cable fault detection device based on power line carrier Download PDFInfo
- Publication number
- CN112202473A CN112202473A CN202011167062.3A CN202011167062A CN112202473A CN 112202473 A CN112202473 A CN 112202473A CN 202011167062 A CN202011167062 A CN 202011167062A CN 112202473 A CN112202473 A CN 112202473A
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- unit
- carrier
- circuit
- cable
- signal
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
- H04B3/48—Testing attenuation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to a medium-voltage carrier technology and discloses a cable fault detection device based on a power line carrier, which comprises a host and a slave, wherein the host and the slave respectively comprise a micro-processing unit, a signal sending unit, a signal processing unit and a digital-to-analog conversion unit; the microprocessing unit comprises a switch unit, an MCU power circuit and a power supply unit. The device judges the cable state by judging the communication quality of the carrier, the communication quality of the carrier is good, the communication rate is high, and the communication link is normal and the cable state is good; when the carrier communication quality is not good, the carrier system adopts slow communication, which indicates that the cable is likely to have faults, acquires the communication link condition to make preliminary judgment and makes response measures in advance, and eliminates the line faults in time.
Description
Technical Field
The invention relates to a medium-voltage carrier technology, in particular to a cable fault detection device based on a power line carrier.
Background
The fault of the power cable is directly related to the safe operation of the whole power system, so that when the power cable breaks down, the fault point needs to be detected and checked as soon as possible and eliminated in time. At present, the fault types are mainly divided into open-circuit faults, low-resistance faults and high-resistance faults. Because power cable buries underground mostly, wants to investigate the fault point, will consume a large amount of manpower and materials, and to a great extent has influenced power supply and has resumeed normal progress, consequently needs a equipment that can short-term test cable trouble. The existing power cable fault detection methods are various and mainly comprise a low-voltage pulse reflection method, a pulse voltage method, a pulse current method and a secondary pulse method. The low-voltage pulse reflection method is simple to operate, has low technical requirements, is intuitive in measurement effect and is high in measurement accuracy. However, for short-circuit faults with resistances above 100k, it is difficult to observe the reflected wave because it is attenuated too much during transmission. In addition, if the location of the fault is too close to the test point, reflected waves are not observed, which makes the test difficult.
The secondary pulse method is simple to operate, safe and reliable, and the accuracy of the measurement result is high, but instruments used in the method are more than those used in other test modes, and the time spent on fault breakdown is long due to the fact that the resistance requirement of a fault point is reduced to be low.
Moreover, the existing microprocessor work control circuit has the following defects:
when the switch unit sends a working starting signal to the MCU power circuit, the MCU power circuit starts working, and the power supply unit provides working power for the microprocessor after passing through the MCU power circuit. When the microprocessor works, the switch unit is required to continuously send a working signal to the MCU power circuit, otherwise, the microprocessor stops working and is in a standby state.
When the switch unit sends a stop signal to the MCU power circuit, the MCU power circuit does not stop working, and the microprocessor is in a low power consumption state at the moment and cannot cut off the power supply of the microprocessor, so that part of the electric quantity of the power supply unit can be consumed by the microprocessor through the MCU power circuit. Thereby causing the power supply unit (battery) to run out and be damaged when the product is not used for a long time.
Disclosure of Invention
Based on the defects, the invention provides the cable fault detection device based on the power line carrier, which can realize real-time detection of cable faults, quickly distinguish fault positions, has high accuracy and is convenient to install and maintain.
In order to achieve the above object, the present invention provides a cable fault detection device based on a power line carrier, including a host and a slave, wherein the host and the slave respectively include the following functional modules:
the micro-processing unit controls the work of the carrier machine and the processing operation of the test data; sending a fault detection command to a signal sending unit to control sending signals; receiving and analyzing the result converted by the analog-digital conversion unit, and returning the analysis result; the micro-processing unit is respectively connected with the signal sending unit, the analog-to-digital conversion unit and the signal receiving and shaping unit; the microprocessor comprises a switch unit, an MCU power circuit and a power supply unit, wherein the output end of the power supply unit is electrically connected with the input end of the MCU power circuit;
the signal sending unit is used for receiving a carrier command of the microprocessor, generating a carrier signal with fixed frequency and transmitting the carrier signal with fixed frequency to the tested cable;
the signal processing unit is used for receiving the signals transmitted by the tested cable and filtering and shaping the carrier signals and transmitting the shaped signals to the analog-to-digital conversion unit;
the analog-to-digital conversion unit is used for carrying out digital processing on the acquired signals and converting the analog signals into digital signals which can be processed by the micro-processing unit, and the analog-to-digital conversion unit is electrically connected with the signal processing unit and the micro-processing unit respectively.
Preferably, the power supply unit further comprises a second switch circuit, the power supply unit is rechargeable, and the power supply unit further comprises a charging interface and a charging circuit, wherein the charging interface is electrically connected with the input end of the power supply unit through the charging circuit; the charging interface is also electrically connected with the input end of the second switch circuit, the first output end of the second switch circuit is electrically connected with the enabling end of the MCU power circuit, and the second output end of the second switch circuit is electrically connected with the input end of the MCU power circuit.
Preferably, the charging device further comprises a protection circuit, and the charging circuit is electrically connected with the power supply unit through the protection circuit.
The invention has the beneficial effects that:
because the communication link is the outer shielding layer of the cable, the fault existing in the shielding layer is solved in advance after the fault of the shielding layer is detected, and the factors causing the cable fault can be extracted and eliminated; because the related equipment is less, the installation is convenient and the maintenance is convenient; meanwhile, when the power supply unit is charged, the microprocessor does not consume the electric quantity of the power supply unit, so that the power supply unit can be quickly filled with the electric quantity, the charging time is reduced, the safety is good, and the product performance and the user experience are improved.
Detailed Description
The technical solution of the present invention will be described below:
the medium-voltage carrier communication system comprises a management machine and a fault detection device, wherein a master station is communicated with the management machine, the management machine is connected with a host of the fault detection device, the host of the fault detection device is connected with a slave, and the slave is connected with terminal equipment. The cable fault detection device comprises a host and a slave, wherein the host and the slave respectively comprise the following functional modules:
the micro-processing unit controls the work of the carrier machine and the processing operation of the test data; sending a fault detection command to a signal sending unit to control sending signals; receiving and analyzing the result converted by the analog-digital conversion unit, and returning the analysis result; the micro-processing unit is respectively connected with the signal sending unit, the analog-to-digital conversion unit and the signal receiving and shaping unit; the microprocessor comprises a switch unit, an MCU power circuit and a power supply unit, wherein the output end of the power supply unit is electrically connected with the input end of the MCU power circuit;
the signal sending unit is used for receiving a carrier command of the microprocessor, generating a carrier signal with fixed frequency and transmitting the carrier signal with fixed frequency to the tested cable;
the signal processing unit is used for receiving the signals transmitted by the tested cable and filtering and shaping the carrier signals and transmitting the shaped signals to the analog-to-digital conversion unit;
the analog-to-digital conversion unit is used for carrying out digital processing on the acquired signals and converting the analog signals into digital signals which can be processed by the micro-processing unit, and the analog-to-digital conversion unit is electrically connected with the signal processing unit and the micro-processing unit respectively.
The power supply unit is rechargeable, and comprises a charging interface and a charging circuit, wherein the charging interface is electrically connected with the input end of the power supply unit through the charging circuit; the charging interface is also electrically connected with the input end of the second switch circuit, the first output end of the second switch circuit is electrically connected with the enabling end of the MCU power circuit, and the second output end of the second switch circuit is electrically connected with the input end of the MCU power circuit.
The charging circuit is electrically connected with the power supply unit through the protection circuit.
The factors of cable faults mainly comprise the quality problem of the cable; the construction quality problem is as follows: in the installation process of the cable, some necessary protection or protection measures are not taken for the cable, for example, the cable is affected with damp due to poor sealing performance, and the interface is unreasonable in design; cable management problems: aged cables are not replaced in time, so that the cables are used for a long time under an overload condition, or the cables are placed in a corrosive environment for a long time to work, and the like, and the insulation aging and deterioration of the cables can be caused. Analysis of cable fault factors shows that the occurrence of the fault of the shielding layer is prior to the occurrence of the fault of the cable, so that the state of the cable can be known in time according to the state of the shielding layer. The specific communication link of the medium-voltage carrier communication is a cable shielding layer, so that the quality of the carrier communication is influenced by the communication link, and whether the cable fails or not can be detected through the quality of the carrier communication.
When the carrier system works normally, the carrier communication quality is good, the communication speed is high, when the carrier communication quality is not good, the carrier system adopts slow communication, at the moment, the cable is proved to have faults possibly, and a master station worker can acquire the communication link condition to make preliminary judgment and make a countermeasure in advance.
When the master station sends a fault detection command, the management machine receives the fault detection command and sends the fault detection command to the host of the fault detection device.
After the host receives the command, the received command is sent to the signal sending unit through the micro-processing unit, the signal sending unit receives the command, generates a carrier signal with fixed frequency, and sends the carrier signal with fixed frequency to the tested cable. At the moment, a signal receiving and shaping unit of the slave machine receives a signal transmitted by the tested cable, filters and shapes a carrier signal, and transmits the signal to a digital-to-analog conversion unit, the digital-to-analog conversion unit carries out digital processing on the filtered signal, converts an analog signal into a digital signal which can be processed by an unprocessed unit, and transmits the digital signal to a micro-processing unit, and the micro-processing unit analyzes noise parameters and attenuation data of the tested circuit through processing operation on the digital signal.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (3)
1. The cable fault detection device based on the power line carrier is characterized by comprising a host and a slave, wherein the host and the slave respectively comprise the following functional modules:
the micro-processing unit controls the work of the carrier machine and the processing operation of the test data; sending a fault detection command to a signal sending unit to control sending signals; receiving and analyzing the result converted by the analog-digital conversion unit, and returning the analysis result; the micro-processing unit is respectively connected with the signal sending unit, the analog-to-digital conversion unit and the signal receiving and shaping unit; the microprocessor comprises a switch unit, an MCU power circuit and a power supply unit, wherein the output end of the power supply unit is electrically connected with the input end of the MCU power circuit;
the signal sending unit is used for receiving a carrier command of the microprocessor, generating a carrier signal with fixed frequency and transmitting the carrier signal with fixed frequency to the tested cable;
the signal processing unit is used for receiving the signals transmitted by the tested cable and filtering and shaping the carrier signals and transmitting the shaped signals to the analog-to-digital conversion unit;
the analog-to-digital conversion unit is used for carrying out digital processing on the acquired signals and converting the analog signals into digital signals which can be processed by the micro-processing unit, and the analog-to-digital conversion unit is electrically connected with the signal processing unit and the micro-processing unit respectively.
2. The cable fault detection device based on the power line carrier as claimed in claim 1, further comprising a second switch circuit, wherein the power supply unit is rechargeable, and further comprising a charging interface and a charging circuit, wherein the charging interface is electrically connected with the input terminal of the power supply unit through the charging circuit; the charging interface is also electrically connected with the input end of the second switch circuit, the first output end of the second switch circuit is electrically connected with the enabling end of the MCU power circuit, and the second output end of the second switch circuit is electrically connected with the input end of the MCU power circuit.
3. The power line carrier-based cable fault detection device according to claim 2, further comprising a protection circuit, wherein the charging circuit is electrically connected to the power supply unit through the protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011167062.3A CN112202473A (en) | 2020-10-28 | 2020-10-28 | Cable fault detection device based on power line carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011167062.3A CN112202473A (en) | 2020-10-28 | 2020-10-28 | Cable fault detection device based on power line carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112202473A true CN112202473A (en) | 2021-01-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011167062.3A Withdrawn CN112202473A (en) | 2020-10-28 | 2020-10-28 | Cable fault detection device based on power line carrier |
Country Status (1)
| Country | Link |
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| CN (1) | CN112202473A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285615A (en) * | 2020-10-27 | 2021-01-29 | 衡阳市一鑫光电科技有限公司 | Cable detection device capable of rapidly distinguishing fault position |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026247A (en) * | 2016-06-17 | 2016-10-12 | 上海与德通讯技术有限公司 | Charging equipment and charging method thereof |
| CN209516686U (en) * | 2019-03-15 | 2019-10-18 | 湖南中烟工业有限责任公司 | A kind of microprocessor work control circuit |
| US20200189416A1 (en) * | 2018-12-18 | 2020-06-18 | Hyundai Motor Company | Charging cable and communication device communicating with the same |
| CN111679152A (en) * | 2020-06-10 | 2020-09-18 | 青岛鼎信通讯股份有限公司 | Cable fault detection device based on power line carrier |
| CN112285615A (en) * | 2020-10-27 | 2021-01-29 | 衡阳市一鑫光电科技有限公司 | Cable detection device capable of rapidly distinguishing fault position |
-
2020
- 2020-10-28 CN CN202011167062.3A patent/CN112202473A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026247A (en) * | 2016-06-17 | 2016-10-12 | 上海与德通讯技术有限公司 | Charging equipment and charging method thereof |
| US20200189416A1 (en) * | 2018-12-18 | 2020-06-18 | Hyundai Motor Company | Charging cable and communication device communicating with the same |
| CN209516686U (en) * | 2019-03-15 | 2019-10-18 | 湖南中烟工业有限责任公司 | A kind of microprocessor work control circuit |
| CN111679152A (en) * | 2020-06-10 | 2020-09-18 | 青岛鼎信通讯股份有限公司 | Cable fault detection device based on power line carrier |
| CN112285615A (en) * | 2020-10-27 | 2021-01-29 | 衡阳市一鑫光电科技有限公司 | Cable detection device capable of rapidly distinguishing fault position |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285615A (en) * | 2020-10-27 | 2021-01-29 | 衡阳市一鑫光电科技有限公司 | Cable detection device capable of rapidly distinguishing fault position |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210108 |