CN203178408U - Cable line fault indicator - Google Patents
Cable line fault indicator Download PDFInfo
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- CN203178408U CN203178408U CN 201320166977 CN201320166977U CN203178408U CN 203178408 U CN203178408 U CN 203178408U CN 201320166977 CN201320166977 CN 201320166977 CN 201320166977 U CN201320166977 U CN 201320166977U CN 203178408 U CN203178408 U CN 203178408U
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- cable line
- line fault
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Abstract
A cable line fault indicator belongs to the field of electric automation. The indicator comprises an MCU and is characterized in that an ADC is arranged inside the MCU; a measurement unit, a power drawing unit, an energy storage unit, a power supply module and a communication module are connected with the MCU; and the measurement unit is connected with the ADC disposed in the MCU. The MCU controls the ADC to be enabled for data acquisition of the measurement unit, the acquired data is sent to a central processing unit inside the MCU for data processing and fault determination, the processed data is sent to a communication port inside the MCU, and the communication port uploads the data through the communication module connected with the communication port; and the power drawing unit supplies power to the MCU through the power supply module connected with the power drawing unit, and the power drawing unit is at the same time connected with the energy storage unit and charges the energy storage unit. The cable line fault indicator helps to solve problems of unreliable indication, inaccurate uploaded current, a narrow application scope and short service life of a conventional cable line fault indicator.
Description
Technical field
A kind of cable line fault indicator belongs to the power automation field.Be specifically related to the fault detect indicator of cable line in a kind of 10kV of being applicable to ring main unit, the cable branch box.
Background technology
Cable fault indicator is a kind of for the short trouble of power cable section and the comprehensive detection device of singlephase earth fault.It is installed in loop-network switch cabinet in the distribution network system, the cable branch box, and the staff can determine rapidly and the failure judgement section by the warning indication of indicator, finds out the trouble spot.In the prior art, cable fault indicator mainly is divided into analog and digital two types product.Analog product is early production, and each function of analog cable fault indicator realizes that by mimic channel its reliability and measuring accuracy are often relatively poor fully, and automatization level is lower simultaneously; The structure of digital product mainly comprises following components as shown in Figure 3: data acquisition module, CPU (central processing unit) and communication module.Wherein central processing module is mainly finished functions such as controlling of sampling, data processing, logic judgement; The sampling control signal that data acquisition module receiving center processing module is sent is finished the collection of analog quantity; Communication module requires to carry out the transmission of data according to particular communication port and stipulations.But cable fault indicator in the prior art exist usually when using indicating fault unreliable, report electric current inaccurate, the shortcoming that the scope of application is little, and generally adopt battery as power supply, serviceable life and job stability have been subjected to very big restriction.
Summary of the invention
The technical problems to be solved in the utility model is: overcome the deficiencies in the prior art, a kind of a kind of cable line fault indicator that has solved drawbacks such as the indication of present cable line fault indicator is unreliable, to upload electric current inaccurate, and the scope of application is little, serviceable life is short is provided.
The technical scheme that its technical matters that solves the utility model adopts is: this a kind of cable line fault indicator, comprise MCU, it is characterized in that: MCU is built-in with ADC, be connected with measuring unit with MCU, the power taking unit, energy-storage units, power module and communication module, the built-in ADC of measuring unit and MCU links to each other, MCU starts by sampling enabling signal control ADC measuring unit is carried out the collection of data, and the data that collect are delivered to CPU (central processing unit) in the MCU carry out that data are handled and fault is judged, and the data of handling are sent to communication port in it, communication port is uploaded data by the communication module that is attached thereto; The power taking unit is that MCU powers by the power module that is attached thereto, and the power taking unit links to each other with energy-storage units simultaneously and is its charging.
Described measuring unit comprises measures CT, rectifier bridge and measuring resistance, and measure CT and from circuit, be truncated to ac current signal, be dc current signal through the rectifier bridge rectification, dc current signal is loaded into the measuring resistance two ends and forms measurement voltage signal.
Described power taking unit comprises power taking CT, rectifier bridge, holding circuit and mu balanced circuit.
Described sampling enabling signal is the look-at-me of overflowing of the built-in autotimer of MCU.
Described energy-storage units adopts super capacitor.
Described communication module is provided with standard SC optical fiber interface, and realizes uploading of data by standard SC optical fiber interface.
Described MCU adopts the microprocessor chip of PIC16F690.
Described MCU or employing STC15F2K60S2 series microprocessor chip.
Compared with prior art, the beneficial effect that has of the present utility model is:
1, adopt high-performance super low-power consumption MCU as processor, built-in ADC module, antijamming capability is strong, and order set is simple, and indication is reliable, and is practical;
2, MCU uploads current data and fault-signal by SC standard fiber interface, has improved the antijamming capability in the transmission course, uploads electric current accurately and reliably;
3, take all factors into consideration the current characteristic of various line faults, failure criterion is rationally reliable, and is applied widely;
4, built-in power taking unit need not battery, has avoided damaging or to exhaust the indicator that causes malfunctioning because of battery;
5, adopted super capacitor that lithium battery commonly used in the like product is substituted, it is short and cause problems such as indicating fault is malfunctioning because lithium battery exhausts to have solved in the prior art serviceable life;
6, adopt current transformer as the element of current acquisition and electric energy intercepting, make work more reliable and more stable, acquisition precision is higher simultaneously.
Description of drawings
Fig. 1 is a kind of cable line fault indicator block diagram.
Fig. 2 is a kind of cable line fault indicator software configuration synoptic diagram.
Fig. 3 is the prior art block diagram.
Embodiment
Fig. 1 ~ 2nd, most preferred embodiment of the present utility model is described further below in conjunction with 1 ~ 3 pair of the utility model of accompanying drawing.
As shown in Figure 1, a kind of cable line fault indicator of the present utility model consists of the following components: as the MCU of whole device core and the measuring unit that links to each other with MCU, power taking unit, energy-storage units, power module and communication module.The built-in ADC of measuring unit and MCU links to each other, the data that collect are carried out the data processing by the CPU (central processing unit) that ADC is delivered in the MCU, and the data of handling are sent to communication port in it, communication port upload the data to user's set by the communication module that is attached thereto, simultaneously data are sent to panel, realize the demonstration of fault.The power taking unit intercepts micro-electric energy and is that MCU powers by the power module that is attached thereto from circuit.The power taking unit links to each other with energy-storage units simultaneously and for its charging, when breaking down in the circuit, replacing the power taking unit by the energy-storage units energy stored is that MCU powers, to keep uploading of data.
Structure and the concrete function of each unit are as follows:
MCU: in the utility model, what MCU adopted is that model is the low-power consumption type process chip of PIC16F690, and inside is built-in with ADC, has on-line debugging and online download function simultaneously.Realize analog to digital conversion by its built-in ADC, reduced wiring quantity, strengthened antijamming capability.When real work, by the program setting, use overflowing of autotimer to interrupt as the sampling enabling signal, MCU starts the respective channel of ADC according to the sampling enabling signal and carries out the collection of data, and the data that collect are delivered to CPU (central processing unit) is carried out the processing of data and fault is judged, calculate the current data in the circuit.By the communication port in the MCU and the communication module that links to each other with communication port the current data of circuit is uploaded to user's set according to time interval of presetting then; When breaking down, the fault current value is uploaded, simultaneously fault-signal is sent to panel, carry out the demonstration of fault by panel.The time interval of data upload can be set according to user's requirement, is defaulted as 15 minutes.
Measuring unit: measuring unit comprises measures CT, rectifier bridge and measuring resistance.Software program utilizes the instantaneous voltage signal (this voltage signal and line current signal are linear) on the built-in ADC collection measuring resistance of MCU, obtains characterizing the digital signal of line current, and recycling MCU calculates the momentary current value on the circuit.In this device, adopt current transformer (CT) as data acquisition element, thereby can reach higher measuring accuracy, when this device was measured, precision can reach 5%.
The power taking unit: the power taking unit comprises power taking CT, rectifier bridge, holding circuit and mu balanced circuit.The AC energy of trace is obtained in the power taking unit from cable line; obtained alternating current electric energy becomes stable, pure direct current electric energy after the processing through rectifier bridge, holding circuit and mu balanced circuit successively; being the energy-storage units charging, is the MCU power supply by power module simultaneously.In the present embodiment, adopted current transformer (CT) as the power taking element equally.Holding circuit in the power taking unit mainly comprises current foldback circuit and overvoltage crowbar.
Energy-storage units: when in the circuit phase fault or shorted to earth fault taking place, the protective relaying device that is installed in the faulty line can cut off faulty line in the extremely short time, and the faulty line electric current reduces to zero immediately.This moment, the power taking unit can't satisfy the power demands of MCU, and energy stored replaces the power taking unit to power as MCU in the energy-storage units thereby use, to keep uploading of data.In the utility model, energy-storage units uses super capacitor to replace the lithium battery of using always in the like product, and the super capacitor memory-less effect can carry out unlimited discharging and recharging in theory, and prolonged the serviceable life of device greatly.
Power module: the electric energy that the power taking unit is obtained from circuit is current signal, this current signal can't directly be that MCU is used, the current signal of the power taking unit being obtained by power module is converted to the voltage signal that is fit to the MCU use, to satisfy the demand of MCU work.When realizing that current signal is converted to voltage signal, can adopt resistance to realize conversion.Because this device is directly installed in the cable line; so electric current changes greatly in the circuit; only can't reliably working by resistance, in side circuit, can cooperate with resistance and finish current signal to the conversion of voltage signal by current drain circuit and overcurrent, overvoltage crowbar are set.
The data that communication module: MCU finishes dealing with its CPU (central processing unit) are passed to communication module by communication port, then by communication module with data upload to user's set.What adopt between a kind of cable line fault indicator of the present utility model and the user's set is standard SC optical fiber interface, so communication module at first is converted to light signal with electric signal after receiving the data that central processing unit for processing finishes, by standard SC optical fiber interface light signal is passed to user's set then, finishes uploading of data.Communication module has been owing to adopted standard SC optical fiber interface, and its built-in be highlighted light emitting diode, so the signal transmission is more reliable.
Be illustrated in figure 2 as software configuration synoptic diagram of the present utility model.MCU receives the signal controlling ADC startup of timer and finishes data collection task, and ADC is passed to CPU (central processing unit) with the data that collect, and finishes data processing and fault judgement in CPU (central processing unit).The data of finishing dealing with are passed to communication module according to the communication port of pre-set time interval by MCU, by communication module with data upload to user's set.
Concrete criterion when CPU (central processing unit) is finished the fault judgement is:
1, initial line current is non-vanishing;
2, line current sudden change amount is greater than setting value (be defaulted as 200A, can set according to customer requirements);
3, the circuit mutation current duration is in 3 seconds;
4, sudden change back line current vanishing.
When satisfying above four criterions simultaneously, then can be judged to be phase fault or shorted to earth fault take place in the circuit.
After breaking down, the panel of a kind of cable line fault indicator of the present utility model shows fault, when phase fault took place, the short trouble indicator that articulates on the short circuit two-phase sent failure message, characterized the LED lamp flicker of fault phase on the panel indicator; When single-phase shorted to earth took place, the short trouble indicator that fault articulates on mutually sent failure message, characterizes the LED lamp flicker of fault phase on the panel indicator, and when two kinds of faults took place, the flashing mode of LED was identical.
A kind of cable line fault indicator of the present utility model automatically resets after finishing indicating fault and uploading current data, and automatically reset setting is by realizing by MCU being carried out software programming.Panel automatically resets at the appointed time simultaneously.Resetting equally by realizing that by MCU being carried out software programming the above-mentioned stipulated time can set up on their own, is defaulted as 2 hours of panel.
The concrete course of work is as follows:
A kind of cable line fault indicator course of work of the present utility model can be divided into following a few step:
1, it is the prerequisite that this device can be worked that power taking process, power taking unit can obtain enough electric energy.When line current during greater than 2A, electricity getting device can be from power taking on the circuit.The electric energy of the trace that the unit of power taking at this moment goes from circuit, this part electric energy is divided into two parts, and a part is charged to energy-storage units, and another part is by the working power of power module as Single Chip Microcomputer (SCM) system;
2, DATA REASONING, upload procedure, measuring unit are measured and by current transformer (CT) circuit to be measured, and what measure that CT collects this moment is alternating current.Alternating current is rectified into DC current through the rectifier bridge in the measuring unit, and this DC current flows through measuring resistance, forms measuring voltage (this measuring voltage and line current signal are linear) at the measuring resistance two ends.Software program utilizes the built-in ADC of MCU to gather instantaneous voltage signal on the measuring resistance then, and is converted to the digital signal that characterizes line current, and the CPU (central processing unit) in the MCU calculates momentary current value on the circuit according to above-mentioned digital signal then.When CPU (central processing unit) is carried out data computation, CPU (central processing unit) is sent to communication port according to pre-set time interval, and be sent to the communication module that is attached thereto by communication port, communication module at first is converted to light signal with electric signal, and by the standard SC optical fiber interface established in it with data upload to user's set;
3, the CPU (central processing unit) that fault is judged, data upload process: MCU is interior is judged line fault according to the momentary current value that ADC collects: when the circuit operate as normal, this current instantaneous value changes little, even there is big fluctuation to surpass setting value, because line current finally recovers normal value, and should not send alerting signal; When line fault; what flow through on the circuit is that (current value is generally less for normal line current; generally between 10A ~ 200A) can sport more than the 400A even higher; the protective relaying device of installing this moment on the line can be at extremely short time internal cutting off faulty line, and the faulty line electric current reduces to zero immediately.This moment, the work of this device can't power taking be kept in the power taking unit, continued as MCU by energy-storage units and powered to keep uploading of fault data, and this device is answered after having indicated fault and having uploaded current data automatically; MCU is passed to panel with fault-signal simultaneously fault is shown, panel at the appointed time to after reset.
In the utility model, as mentioned above, what MCU adopted is PIC16F690 type single-chip microcomputer, also can adopt other single-chip microcomputers with low-power consumption function and built-in ADC module, as the STC15F2K60S2 series of macrocrystalline.Described user's set is the light signal receiving of realizing optical communication with communication module, and this light signal receiving receives after the light signal of communication module, can the light signal that receive be further processed, and finishes further uploading of data.
The above, it only is preferred embodiment of the present utility model, be not to be the restriction of the utility model being made other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solutions of the utility model content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment does, still belongs to the protection domain of technical solutions of the utility model according to technical spirit of the present utility model.
Claims (8)
1. cable line fault indicator, comprise MCU, it is characterized in that: MCU is built-in with ADC, be connected with measuring unit with MCU, the power taking unit, energy-storage units, power module and communication module, the built-in ADC of measuring unit and MCU links to each other, MCU starts by sampling enabling signal control ADC measuring unit is carried out the collection of data, the CPU (central processing unit) that the data that collect are delivered in the MCU is carried out data processing and fault judgement, and the data of handling are sent to communication port in it, communication port is uploaded data by the communication module that is attached thereto; The power taking unit is that MCU powers by the power module that is attached thereto, and the power taking unit links to each other with energy-storage units simultaneously and is its charging.
2. a kind of cable line fault indicator according to claim 1, it is characterized in that: described measuring unit comprises measures CT, rectifier bridge and measuring resistance, measure CT and from circuit, be truncated to ac current signal, be dc current signal through the rectifier bridge rectification, dc current signal is loaded into the measuring resistance two ends and forms measurement voltage signal.
3. a kind of cable line fault indicator according to claim 1, it is characterized in that: described power taking unit comprises power taking CT, rectifier bridge, holding circuit and mu balanced circuit.
4. a kind of cable line fault indicator according to claim 1, it is characterized in that: described sampling enabling signal is the look-at-me of overflowing of the built-in autotimer of MCU.
5. a kind of cable line fault indicator according to claim 1 is characterized in that: described energy-storage units employing super capacitor.
6. a kind of cable line fault indicator according to claim 1, it is characterized in that: described communication module is provided with standard SC optical fiber interface, and realizes uploading of data by standard SC optical fiber interface.
7. a kind of cable line fault indicator according to claim 1 is characterized in that: the microprocessor chip of described MCU employing PIC16F690.
8. a kind of cable line fault indicator according to claim 1 is characterized in that: described MCU or employing STC15F2K60S2 series microprocessor chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320166977 CN203178408U (en) | 2013-04-07 | 2013-04-07 | Cable line fault indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320166977 CN203178408U (en) | 2013-04-07 | 2013-04-07 | Cable line fault indicator |
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| CN203178408U true CN203178408U (en) | 2013-09-04 |
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| CN 201320166977 Expired - Fee Related CN203178408U (en) | 2013-04-07 | 2013-04-07 | Cable line fault indicator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116296A (en) * | 2015-10-12 | 2015-12-02 | 国家电网公司 | Special fault indicator for high-voltage power transmission network cable line |
| CN105225466A (en) * | 2015-09-16 | 2016-01-06 | 安康鸿天科技开发有限公司 | A kind of data transmission and fault detection system |
| CN105527544A (en) * | 2016-02-17 | 2016-04-27 | 上海紫通信息科技有限公司 | Distribution line fault positioning device |
-
2013
- 2013-04-07 CN CN 201320166977 patent/CN203178408U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105225466A (en) * | 2015-09-16 | 2016-01-06 | 安康鸿天科技开发有限公司 | A kind of data transmission and fault detection system |
| CN105116296A (en) * | 2015-10-12 | 2015-12-02 | 国家电网公司 | Special fault indicator for high-voltage power transmission network cable line |
| CN105527544A (en) * | 2016-02-17 | 2016-04-27 | 上海紫通信息科技有限公司 | Distribution line fault positioning device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 255095 Shandong Province, Zibo city Zhangdian District win Road No. 77, Zibo science and Technology Industrial Park Business Park Patentee after: Zibo Yuanxing Electronics Co., Ltd. Patentee after: SHANDONG KEHUI POWER AUTOMATION CO., LTD. Address before: 255095 Shandong Province, Zibo city Zhangdian District win Road No. 77, Zibo science and Technology Industrial Park Business Park Patentee before: Zibo Yuanxing Electronics Co., Ltd. Patentee before: Shandong Kehui Electric Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20200407 |
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| CF01 | Termination of patent right due to non-payment of annual fee |