CN210954296U - Cable line ground fault detection device and system - Google Patents
Cable line ground fault detection device and system Download PDFInfo
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- CN210954296U CN210954296U CN201921708900.6U CN201921708900U CN210954296U CN 210954296 U CN210954296 U CN 210954296U CN 201921708900 U CN201921708900 U CN 201921708900U CN 210954296 U CN210954296 U CN 210954296U
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Abstract
The utility model provides a cable run ground fault detection device and system, include: the fault indication unit is arranged on the cable line, and the collection unit is electrically connected with the fault indication unit; the fault indication unit comprises an A-phase fault indicator, a B-phase fault indicator and a C-phase fault indicator which are respectively arranged on A, B, C three-phase lines of the cable line; the collecting unit comprises a main controller, a first wireless module and a signal receiving module, the signal receiving module is electrically connected with the main controller, the first wireless module is electrically connected with the main controller, and the fault indicating unit is electrically connected with the signal receiving module and used for sending waveform and short-circuit fault information of a cable line to the collecting unit, and the collecting unit performs zero sequence synthesis and calculates zero sequence current according to the waveform. Based on the utility model discloses, can accurately judge earth fault and save an earth fault indicator.
Description
Technical Field
The utility model relates to a cable run fault detection field, in particular to cable run ground fault detection device and system.
Background
The fault indicator is widely installed in a medium-low voltage distribution network line and used for monitoring line short circuit and ground fault. After the circuit breaks down, the concrete position of instruction fault point that can be quick helps the fortune dimension personnel to rush to the scene at the very first time, and the troubleshooting resumes the power supply. At present, cable fault indicators on the market are various in types, but are different in size, and comprise 3 short circuit fault indicators and 1 ground fault indicator. The 3 short-circuit type fault indicators are used for detecting the short-circuit fault of the line, and the ground fault indicator is used for detecting the ground fault of the line. And transmitting the fault information to the collecting unit and finally transmitting the fault information to the background.
The existing product consists of 3 short-circuit fault indicators and 1 ground fault indicator, and detects the short-circuit fault and the ground fault respectively. The short-circuit fault indicator calculates an effective value by sampling the load current of the cable line, and judges whether a short-circuit fault occurs according to the change rule of the effective value. The earth fault indicator samples the zero sequence current of the cable line, calculates an effective value, and judges whether an earth fault occurs according to the magnitude and duration of the zero sequence current. However, the short-circuit fault indicator cannot monitor real-time changes of waveforms, only can calculate effective values, and cannot effectively restore the real state of a line when a fault occurs. Secondly, the earth fault indicator collects zero sequence current, the error is large, and misjudgment is easily caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a cable run ground fault detection device and system is through setting up three short circuit fault indicator on three-phase cable circuit to send the waveform of three-phase cable circuit to the unit that collects through optic fibre and synthesize the zero sequence, and calculate zero sequence current, be used for fortune dimension personnel accurate the searching out fault location.
The utility model discloses a first embodiment discloses cable run ground fault detection device, include: the fault indication device comprises a fault indication unit arranged on a cable line and a collection unit electrically connected with the fault indication unit;
the fault indication unit comprises an A-phase fault indicator, a B-phase fault indicator and a C-phase fault indicator which are respectively arranged on A, B, C three-phase lines of the cable line;
the collecting unit comprises a main controller, a first wireless module and a signal receiving module, the signal receiving module is electrically connected with the main controller, the first wireless module is electrically connected with the main controller, and the fault indicating unit is electrically connected with the signal receiving module, wherein the fault indicating unit is used for sending the waveform of the cable line to the collecting unit, and the collecting unit carries out zero sequence synthesis and calculates zero sequence current according to the waveform.
Preferably, the phase a fault indicator, the phase B fault indicator and the phase C fault indicator are all provided with a power module, a processing chip, a PCB rogowski coil, a second wireless module and an LED indicator light;
the processing chip is electrically connected with the power module, the output end of the processing chip is electrically connected with the LED indicating lamp, the input end of the processing chip is electrically connected with the PCB Rogowski coil, and the second wireless module is electrically connected with the processing chip.
Preferably, the a-phase fault indicator, the B-phase fault indicator and the C-phase fault indicator are short-circuit fault indicators.
Preferably, the signal receiving module is a photosensitive receiving module, wherein the fault indicating unit communicates with the photosensitive receiving module of the collecting unit through an optical fiber.
Preferably, the phase a fault indicator, the phase B fault indicator and the phase C fault indicator are all provided with a wire clamping structure, the PCB rogowski coil is arranged in the wire clamping structure, and the phase a fault indicator, the phase B fault indicator and the phase C fault indicator are fixed on the cable line through the wire clamping structure.
Preferably, the processing chip model is MSP430FR 5949.
Preferably, the chip model of the main controller is stm32f 103.
A second embodiment of the present invention provides a cable ground fault detection system, which includes a terminal and the cable ground fault detection apparatus as described above, where the aggregation unit transmits data to the terminal through the first wireless module.
Preferably, the first wireless module is a 4G module.
Based on the utility model provides a cable run ground fault detection device and system installs on the three-phase line through the three-phase fault indicator that is provided with the card line structure for the wave form on the admission three-phase line, and send to collecting the unit through optic fibre, carry out the synthesis of zero sequence, and calculate accurate zero sequence current, and then judge ground fault, be used for fortune dimension personnel accurate the searching out fault location, save a ground fault indicator simultaneously.
Drawings
Fig. 1 is a schematic view of a cable line ground fault detection device according to a first embodiment of the present invention;
fig. 2 is a schematic view of a wire-clamping structure of a fault indicator provided by the present invention;
fig. 3 is a schematic diagram of a cable line ground fault detection system according to a second embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
Referring to fig. 1, a first embodiment of the present invention discloses a cable line ground fault detection apparatus, including: a fault indication unit 1 mounted on a cable line, and a collection unit 2 electrically connected to the fault indication unit 1;
the fault indication unit 1 comprises an A-phase fault indicator, a B-phase fault indicator and a C-phase fault indicator which are respectively arranged on A, B, C three-phase lines of a cable line;
collect unit 2 and include main control unit, first wireless module, signal reception module with main control unit electrical connection, first wireless module with main control unit electrical connection, fault indication unit 1 and signal reception module electrical connection, wherein, fault indication unit 1 is used for sending cable run's wave form and short circuit fault information to collect unit 2, collect unit 2 basis the wave form carries out the zero sequence synthesis and calculates the zero sequence current.
It should be noted that the fault indication unit 1 is installed on the secondary side of 10kV and is used for detecting short-circuit fault and ground fault in the cable line, the fault indication unit 1 is provided with three fault indicators, which are an a-phase fault indicator, a B-phase fault indicator and a C-phase fault indicator, respectively, installed on A, B, C three-phase lines of the cable line, records A, B, C waveforms of the three-phase lines and sends the waveforms to the collecting unit 2, the collecting unit 2 carries out A, B, C three-phase line waveform through the signal receiving module, synthesizes the waveform into zero sequence through the main controller, calculates zero sequence current, further judging the grounding fault, sending the fault information to the terminal through the wireless module for the operation and maintenance personnel of the terminal to process the fault, when handling, the trouble of the earth fault indicator and the connection to the collecting unit 2 can be eliminated.
In this embodiment, the a-phase fault indicator, the B-phase fault indicator and the C-phase fault indicator are all provided with a power module, a processing chip, a PCB rogowski coil, a second wireless module and an LED indicator light;
the processing chip is electrically connected with the power module, the output end of the processing chip is electrically connected with the LED indicating lamp, the input end of the processing chip is electrically connected with the PCB Rogowski coil, the second wireless module is electrically connected with the processing chip, the second wireless module can be a 4G module or an NB-IOT module, and is used for carrying out wireless information interaction with the collection terminal when the optical fiber is unexpectedly disconnected or wired communication connection in other modes is disconnected.
It should be noted that the rogowski coil of the PCB has the characteristics of real-time current measurement, high response speed, no saturation and almost no phase error, and is used for collecting current signals in a cable line and sending the current signals to the processing chip for processing, the second wireless module can send the processing chip to the collecting unit 2 in a wireless transmission manner or send the processing chip to a terminal with processing capacity for processing, the power module is used for supplying power to the processing chip, and the LED indicator lamp can be used for indicating the current running state of the fault indicator.
In this embodiment, the a-phase fault indicator, the B-phase fault indicator, and the C-phase fault indicator are short-circuit fault indicators.
The short-circuit fault indicator consists of an electronic element and a mechanical structure, is arranged on the power cable, and collects the load current of the line when the line normally runs; when a line fails, the short-circuit fault of the power line is analyzed and sent to the collecting unit 2.
In this embodiment, the signal receiving module is a photosensitive receiving module, wherein the fault indicating unit 1 and the photosensitive receiving module of the collecting unit 2 communicate with each other through an optical fiber.
It should be noted that the fault indication unit 1 and the collection unit 2 communicate with each other by using optical fibers, and the optical fiber communication has strong anti-electromagnetic interference performance, wide transmission band and large communication capacity; the transmission loss is low, the relay distance is long, the wire diameter is small, the weight is light, and the installation on a cable line is easy.
In this embodiment, referring to fig. 2, the phase a fault indicator, the phase B fault indicator, and the phase C fault indicator are all provided with a wire clamping structure 5, the PCB rogowski coil is arranged in the wire clamping structure 5, and the phase a fault indicator, the phase B fault indicator, and the phase C fault indicator are fixed on the cable line through the wire clamping structure 5.
It should be noted that, the wire clamping structure 5 is provided with a first semicircular arc 3 and a second semicircular arc 4, and a wire of a cable line is arranged between the first semicircular arc 3 and the second semicircular arc 4, so that the fault indicator is fixed on the cable line, the PCB rogowski coil is arranged in the first semicircular arc 3 and the second semicircular arc 4, of course, in other embodiments, the wire clamping structure 5 may also be of other structures, and may also obtain an induced current in other manners, and may be correspondingly arranged according to other situations, and no specific limitation is made here, but these schemes are all in the protection scope of the present invention.
In this embodiment, the type of the processing chip may be MSP430FR 5949. In other embodiments, the processing chip may be a core of another chip model used as a fault indicator, which is not specifically limited herein, but these solutions are all within the protection scope of the present invention. In this embodiment, the chip type number of the main controller may be stm32f 103.
In other embodiments, the chip of the main controller may be another chip model, and is not limited in detail here, but these solutions are all within the protection scope of the present invention.
Referring to fig. 3, a cable ground fault detection system according to a second embodiment of the present invention includes a terminal 6 and a cable ground fault detection apparatus as described above, where the aggregation unit 2 transmits data to the terminal 6 through the first wireless module.
It should be noted that the terminal 6 may be a power distribution master station, and after receiving the fault information transmitted from the collecting unit 2 and analyzing the fault information, an operation and maintenance person of the power distribution master station can accurately process the ground fault occurring on the cable line.
In this embodiment, the first wireless module may be a 4G module. Of course, in other embodiments, the first wireless module may also be an NB-IOT module for communicating with the terminal 6, and these solutions may rotate according to specific situations, which are not specifically limited herein, but these solutions are all within the protection scope of the present invention.
Based on the utility model provides a cable run ground fault detection device and system installs on the three-phase line through the three-phase fault indicator that is provided with the card line structure for the wave form on the admission three-phase line, and send to collecting the unit through optic fibre, carry out the synthesis of zero sequence, and calculate accurate zero sequence current, and then judge ground fault, be used for fortune dimension personnel accurate the searching out fault location, save a ground fault indicator simultaneously.
Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection.
Claims (9)
1. A cable line ground fault detection device, comprising: the fault indication device comprises a fault indication unit arranged on a cable line and a collection unit electrically connected with the fault indication unit;
the fault indication unit comprises an A-phase fault indicator, a B-phase fault indicator and a C-phase fault indicator which are respectively arranged on A, B, C three-phase lines of the cable line;
the collecting unit comprises a main controller, a first wireless module and a signal receiving module, the signal receiving module is electrically connected with the main controller, the first wireless module is electrically connected with the main controller, and the fault indicating unit is electrically connected with the signal receiving module, wherein the fault indicating unit is used for sending waveform and short-circuit fault information of a cable line to the collecting unit, and the collecting unit carries out zero sequence synthesis and calculates zero sequence current according to the waveform.
2. The cable line ground fault detection device according to claim 1, wherein the a-phase fault indicator, the B-phase fault indicator and the C-phase fault indicator are all provided with a power module, a processing chip, a PCB rogowski coil, a second wireless module and an LED indicator light;
the processing chip is electrically connected with the power module, the output end of the processing chip is electrically connected with the LED indicating lamp, the input end of the processing chip is electrically connected with the PCB Rogowski coil, and the second wireless module is electrically connected with the processing chip.
3. The cable line ground fault detection device of claim 2, wherein the a-phase fault indicator, the B-phase fault indicator, and the C-phase fault indicator are short circuit fault indicators.
4. The cable line ground fault detection device of claim 1, wherein the signal receiving module is a photosensitive receiving module, and wherein the fault indication unit communicates with the photosensitive receiving module of the aggregation unit through an optical fiber.
5. The device as claimed in claim 2, wherein the a-phase fault indicator, the B-phase fault indicator and the C-phase fault indicator are all provided with a wire clamping structure, the PCB rogowski coil is arranged in the wire clamping structure, and the a-phase fault indicator, the B-phase fault indicator and the C-phase fault indicator are fixed on the cable line through the wire clamping structure.
6. The cable line ground fault detection device of claim 2, wherein the processing chip is model MSP430FR 5949.
7. The cable line ground fault detection device of claim 1, wherein the main controller has a chip model number stm32f 103.
8. A cable line ground fault detection system comprising a terminal and a cable line ground fault detection device according to any one of claims 1 to 7, said aggregation unit transmitting data to said terminal via said first wireless module.
9. A cable line ground fault detection system as recited in claim 8, wherein said first wireless module is a 4G module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921708900.6U CN210954296U (en) | 2019-10-12 | 2019-10-12 | Cable line ground fault detection device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921708900.6U CN210954296U (en) | 2019-10-12 | 2019-10-12 | Cable line ground fault detection device and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210954296U true CN210954296U (en) | 2020-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921708900.6U Active CN210954296U (en) | 2019-10-12 | 2019-10-12 | Cable line ground fault detection device and system |
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| Country | Link |
|---|---|
| CN (1) | CN210954296U (en) |
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2019
- 2019-10-12 CN CN201921708900.6U patent/CN210954296U/en active Active
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