CN103424666A - Overhead line fault indicator with voltage detection function - Google Patents
Overhead line fault indicator with voltage detection function Download PDFInfo
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- CN103424666A CN103424666A CN2013103033290A CN201310303329A CN103424666A CN 103424666 A CN103424666 A CN 103424666A CN 2013103033290 A CN2013103033290 A CN 2013103033290A CN 201310303329 A CN201310303329 A CN 201310303329A CN 103424666 A CN103424666 A CN 103424666A
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Abstract
An overhead line fault indicator with a voltage detection function comprises a CT power taking module (1), a power supply power (2), a data acquisition and signal conditioning module (3), a digital signal processing module (4) and a wireless communication module (5). The CT power taking module is connected with the power supply module, the power supply module is connected with the data acquisition and signal conditioning module, the digital signal processing module and the wireless communication module, and the data acquisition and signal conditioning module is connected with the digital signal processing module and the wireless communication module in sequence. The overhead line fault indictor can take power from an overhead line by induction, can monitor the voltage of the line through a multi-displacement current sensor mDCS, can monitor the temperature of a line conductor through a thermistor, can perform time slot allocation via the digital signal processing module according to requirements on priorities and sampling rates of different tasks, and can communicate with a master station through a ZigBee wireless communication module. Distinguishing accuracy of various faults of the overhead line is improved greatly.
Description
Technical field
The present invention relates to a kind of electric system fault indicator for overhead lines, especially relate to a kind of fault indicator for overhead lines with voltage detecting function.
Background technology
In recent years, the use of regenerative resource and distributed power generation has increased the complexity of electric network composition, and the raising of distribution network automated level has also caused rolling up of electric network information amount and capital assets equipment investment in addition.If in distribution, overhead transmission line breaks down, often, by the method investigation fault of artificial line walking, time and effort consuming is very inconvenient, and power supply reliability also can't be protected.
Existing electric system fault indicator for overhead lines generally only has the effect that detects short circuit or ground current, indicating fault is provided, do not possess the function that line voltage distribution detects, therefore can only only rely on single current signal to differentiate singlephase earth fault, reliability is very low, and the fault of overhead transmission line more than 70% is single-phase earthing, so a kind of novel fault indicator for overhead lines with voltage detecting function of necessary research.
In order to realize the collection of remote signalling on overhead transmission line, remote measurement amount, the fault detector that can a large amount of economy, autonomy, intelligence are installed on overhead transmission line and can communicate by letter, for the electrical network geographically disperseed provides lasting on-line monitoring, with this, improve availability and the reliability of existing electric system.What fault indicator for overhead lines adopted is passive cognition technology, by the electromagnetic field around perception overhead transmission line conductor, distributes to measure conductor voltage.
Summary of the invention
Technical matters to be solved by this invention, just be to provide a kind of fault indicator for overhead lines with voltage detecting function, not only there is current sense function, can also detection line voltage and conductor temperature, and communicate by wireless communication module and main website, improve the differentiation accuracy rate of the various faults of overhead transmission line.
Solve the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of fault indicator for overhead lines with voltage detecting function, it is characterized in that: described fault detector comprises CT electricity-fetching module 1, power module 2, data acquisition and signal condition module 3, digital signal processing module 4, wireless communication module 5, described CT electricity-fetching module 1 is connected with power module 2, described power module 2 also respectively with data acquisition and signal condition module 3, digital signal processing module 4, wireless communication module 5 connects, described data acquisition and signal condition module 3 and digital signal processing module 4, wireless communication module 5 also connects successively.Referring to Fig. 1.
Described CT electricity-fetching module 1 comprises current transformer, and the cylindrical iron core of current transformer is comprised of two parts, and what the CT core material adopted is the silicon steel that relative permeability is 5000, and iron core is connected on overhead transmission line to form a complete magnetic circuit.Overhead transmission line itself is as the coil of mutual inductor primary side, and secondary side winding has multiturn coil, and the CT no-load voltage ratio is 100:1, and the electric current on overhead transmission line is changed and reduces, continue for latter linked power module, providing energy.The composition of described power module 2 with annexation is: the input of rectification module is connected with the secondary side of CT electricity-fetching module 1, the output one end ground connection of rectification module, and the other end is connected with switching device Q1 drain electrode by the first resistance R 01 through current limliting; The drain electrode of switching device Q1 through the first diode D1 with after the 5th resistance R _ f b2 and the first resistance R 1, with comparer U02 electrode input end, be connected, source electrode through the 4th resistance R _ f b1 with the first resistance R 1, with the electrode input end of comparer U02, be connected, gate pole is connected with the output terminal of comparer U02, gate pole also after antiparallel the second diode D2 ground connection, gate pole also through the second resistance R 2 and the electrode input end of comparer U02, be connected to form feedback; The negative pole of comparer U02 is connected with reference signal Vref through the 3rd resistance R 3; Shunt capacitance C1 and being connected with the input end of voltage stabilizer between the first diode D1 output terminal and the second diode D2 input end; Output termination+the 5V of voltage stabilizer ,+3.3V, GND are connected.Referring to Fig. 2.
The composition of described data acquisition and signal condition module 3 with annexation is: CT electricity-fetching module 1 secondary side is connected with Op amplifier 9 input ends through rectification module output terminal 6, thermistor 7 and multidigit are moved current sensor mDCS8 and also are connected with Op amplifier 9 input ends, Op amplifier 9 output terminals are connected with low-pass filter 10 input ends, and low-pass filter 10 output terminals are connected with ADC sampling module 11 input ends in digital signal processing module 4.Referring to Fig. 3.
Composition and annexation that described multidigit is moved current sensor mDCS8 are: mDCS8 inner layer metal plate 13 is monoblocks, is electrically connected with overhead transmission line conductor 14, has identical electromotive force; The mDCS8 skin is comprised of six sheet metals, every 60 degree of being separated by, between inside and outside layer and skin by insulating material, separated each other, six electric capacity of formation between outer and inner layer metal plate.
Flow through six capacitor C of mDCS by measurement
iSix displacement current i
d(t), can catch in real time the distribution situation of mDCS surface induction electric charge, and the generation of displacement current can calculate line voltage distribution from the variation of overhead transmission line conductor 14. dielectric (flux) density D by the distribution of induced charge on every side of monitoring overhead transmission line.Move current sensor (mDCS) schematic diagram referring to the multidigit of Fig. 4.
The composition of described digital signal processing module 4 and annexation are: digital signal processing module 4 comprises D/A conversion unit ADC, PWM unit, FLASH storage unit, serial communication interface SCI, general purpose I/O interface, external SRAM; The output terminal of the input end of described ADC and data acquisition and low-pass filter 10 in the signal condition module is connected, described SCI is connected with the RS232 serial ports with the SCI in wireless communication module, described Flash storage is connected with external SRAM, described digital signal processing module and power module+the 5V output terminal is connected.Referring to Fig. 5.
The composition of described wireless communication module 5 and annexation are: comprise ZigBee radio-frequency module, RS232 serial port module, the SCI in the ZigBee module is connected with the SCI of digital signal processing module, and the RS232 serial ports is connected with the exterior PC communication port.
Beneficial effect: compared with prior art, the present invention can respond to power taking from overhead transmission line; Can move current sensor mDCS Monitoring Line voltage by multidigit; Can pass through thermistor Monitoring Line conductor temperature; Can require to carry out time slot allocation according to priority and the sampling rate of different task by digital signal processing module; Can communicate by ZigBee wireless communication module and main website.Greatly improved the differentiation accuracy rate of the various faults of overhead transmission line.
The accompanying drawing explanation
Fig. 1 is composition of the present invention and annexation schematic diagram;
The composition that Fig. 2 is power module 2 of the present invention and annexation schematic diagram;
The composition that Fig. 3 is data acquisition of the present invention and signal condition module and annexation schematic diagram;
The multidigit that Fig. 4 is data acquisition of the present invention and signal condition module is moved current sensor mDCS8 and is formed and the annexation schematic diagram;
The composition that Fig. 5 is digital signal processing module of the present invention and annexation schematic diagram.Embodiment
As shown in Figure 1, the fault indicator for overhead lines embodiment with voltage detecting function of the present invention, comprise CT electricity-fetching module 1, power module 2, data acquisition and signal condition module 3, digital signal processing module 4, wireless communication module 5.
CT electricity-fetching module 1 is connected with power module 2, power module 2 also is connected power supply with data acquisition and signal condition module 3, digital signal processing module 4, wireless communication module 5 respectively, and 3 of data acquisition and signal condition modules are connected successively with digital signal processing module 4, wireless communication module 5.
CT electricity-fetching module 1 comprises current transformer, and the cylindrical iron core of current transformer is comprised of two parts, and what the CT core material adopted is the silicon steel that relative permeability is 5000, and iron core is connected on overhead transmission line to form a complete magnetic circuit.Overhead transmission line itself is as the coil of mutual inductor primary side, and secondary side winding has multiturn coil, and the CT no-load voltage ratio is 100:1, and the electric current on overhead transmission line is changed and reduces, continue for latter linked power module, providing energy.
Referring to Fig. 2, the composition of power module 2 with annexation is: the input of rectification module is connected with the secondary side of CT electricity-fetching module 1, the output one end ground connection of rectification module, and the other end is connected with switching device Q1 drain electrode through current-limiting resistance R01; The drain electrode of switching device Q1 through the first diode D1 with after the 5th resistance R _ f b2 and the first resistance R 1, with comparer U02 electrode input end, be connected, source electrode through the 4th resistance R _ f b1 with the first resistance R 1, with the electrode input end of comparer U02, be connected, gate pole is connected with the output terminal of comparer U02, gate pole also after antiparallel the second diode D2 ground connection, gate pole also through the second resistance R 2 and the electrode input end of comparer U02, be connected to form feedback; The negative pole of comparer U02 is connected with reference signal Vref through the 3rd resistance R 3; Between the first diode D1 output terminal and the second diode D2 input end shunt capacitance C1 and with voltage stabilizer. input end be connected; Output termination+the 5V of voltage stabilizer ,+3.3V, GND are connected.
Referring to Fig. 3, the composition of data acquisition and signal condition module 3 with annexation is: CT electricity-fetching module 1 secondary side is connected with Op amplifier 9 input ends through rectification module output terminal 6, thermistor 7 and multidigit are moved current sensor mDCS8 and also are connected with Op amplifier 9 input ends, Op amplifier 9 output terminals are connected with low-pass filter 10 input ends, and low-pass filter 10 output terminals are connected with ADC sampling module 11 input ends in digital signal processing module 4.
Referring to Fig. 4, composition and annexation that the multidigit wherein of data acquisition and signal condition module 3 is moved current sensor mDCS8 are: mDCS8 inner layer metal plate 13 and 14 electrical connections of overhead transmission line conductor have identical electromotive force; The mDCS8 skin is comprised of six sheet metals, every 60 degree of being separated by, inside and outside between and skin by insulating material, separated each other, six electric capacity of formation between outer and inner layer metal plate.
Flow through six capacitor C of mDCS by measurement
iSix displacement current i
d(t), can catch in real time the distribution situation of mDCS surface induction electric charge, and the generation of displacement current can calculate line voltage distribution from the variation of overhead transmission line conductor 14 dielectric (flux) density D by the distribution of induced charge on every side of monitoring overhead transmission line.
Referring to Fig. 5, the composition of digital signal processing module 4 and annexation are: digital signal processing module 4 comprises D/A conversion unit ADC, PWM unit, FLASH storage unit, serial communication interface SCI, general purpose I/O interface, external SRAM; The output terminal of the input end of ADC and data acquisition and low-pass filter 10 in the signal condition module is connected, SCI is connected with the RS232 serial ports with the SCI in wireless communication module, Flash storage is connected with external SRAM, digital signal processing module and power module+the 5V output terminal is connected.
The composition of wireless communication module 5 and annexation are: comprise ZigBee radio-frequency module, RS232 serial port module, the SCI in the ZigBee module is connected with the SCI of digital signal processing module, and the RS232 serial ports is connected with the exterior PC communication port.
Fault detector of the present invention is arranged on overhead power line, from circuit, carries out power taking, for the operation of sensing and communication module.By but the fault detector of numerous low costs, autonomy, intelligence and communication is installed on the line, can form the overhead transmission line sensor network, for overhead transmission line provides lasting on-line monitoring function.In the overhead transmission line sensor network, each fault detector, as a communication node, communicates between adjacent node.The MANET function has been guaranteed can not have influence on the continuous service of whole network when single or multiple node stop work.Communication distance between node, according to the difference of neighbourhood noise, can reach several kilometers from 100 meters.The local information of each fault detector is transmitted back several kilometers outer host nodes by point-to-point mode.Host node, as all data concentrators from node, provides a simple data-interface, with SCADA system or EMS system, communicates.
A kind of function realizing method of the fault indicator for overhead lines with voltage detecting function is as following table:
| Function | Implementation method |
| Wireless communication module | Zigbee/IEEE802.15.4 |
| Data acquisition and signal condition module | The high impedance differential amplifier |
| Digital signal processing module | TMS320F2812 |
| Energy acquisition | The CT power taking |
| Electric field measurement around conductor | Multidigit is moved current sensor mDCS |
This fault indicator for overhead lines can work on the circuit of 100A～1000A, and the rate of accuracy reached to 1.3% of measuring circuit electric current.Error mainly comes from the nonlinear characteristic after saturated unshakable in one's determination of CT under the heavy current condition.
Claims (7)
1. the fault indicator for overhead lines with voltage detecting function, it is characterized in that: described fault detector comprises CT electricity-fetching module (1), power module (2), data acquisition and signal condition module (3), digital signal processing module (4), wireless communication module (5), described CT electricity-fetching module is connected with power module, described power module also respectively with data acquisition and signal condition module, digital signal processing module, wireless communication module connects, described data acquisition and signal condition module and digital signal processing module, wireless communication module also connects successively.
2. the fault indicator for overhead lines with voltage detecting function according to claim 1, it is characterized in that: described CT electricity-fetching module (1) comprises current transformer, the cylindrical iron core of current transformer is comprised of two parts, what the CT core material adopted is the silicon steel that relative permeability is 5000, and iron core is connected on overhead transmission line to form a complete magnetic circuit.Overhead transmission line itself is as the coil of mutual inductor primary side, and secondary side winding has multiturn coil, and the CT no-load voltage ratio is 100:1.
3. the fault indicator for overhead lines with voltage detecting function according to claim 1, it is characterized in that: the composition of described power module (2) with annexation is: the input of rectification module is connected with the secondary side of CT electricity-fetching module (1), the output one end ground connection of rectification module, the other end is connected with switching device (Q1) drain electrode through current-limiting resistance (R01), the drain electrode of switching device (Q1) through the first diode (D1) with after the 5th resistance (Rfb2) and the first resistance (R1), with comparer (U02) electrode input end, be connected, source electrode is connected with the electrode input end of comparer (U02) with the first resistance (R1) through the 4th resistance (Rfb1), gate pole is connected with the output terminal of comparer (U02), gate pole is ground connection after antiparallel the second diode (D2) also, gate pole also is connected to form feedback through the second resistance (R2) and the electrode input end of comparer (U02), the negative pole of comparer (U02) is connected with reference signal Vref through the 3rd resistance (R3), shunt capacitance C1 and being connected with the input end of voltage stabilizer between the first diode D1 output terminal and the second diode D2 input end, output termination+the 5V of voltage stabilizer ,+3.3V, GND are connected.
4. the fault indicator for overhead lines with voltage detecting function according to claim 1, it is characterized in that: the composition of described data acquisition and signal condition module (3) with annexation is: CT electricity-fetching module (1) secondary side is connected with Op amplifier (9) input end through rectification module output terminal (6), thermistor (7) and multidigit are moved current sensor mDCS(8) also with Op amplifier (9) input end, be connected, Op amplifier (9) output terminal is connected with low-pass filter (10) input end, low-pass filter (10) output terminal is connected with ADC sampling module (11) input end in digital signal processing module (4).
5. the fault indicator for overhead lines with voltage detecting function according to claim 4, it is characterized in that: described multidigit is moved current sensor mDCS(8) composition and annexation be: mDCS(8) inner layer metal plate (13) be a monoblock, with overhead transmission line conductor (14) electrical connection, there is identical electromotive force; MDCS(8) outerly by six sheet metals, formed, every 60 degree of being separated by, between inside and outside layer and skin by insulating material, separated each other, six electric capacity of formation between outer and inner layer metal plate.
6. the fault indicator for overhead lines with voltage detecting function according to claim 1, it is characterized in that: composition and the annexation of described digital signal processing module (4) are: digital signal processing module (4) comprises D/A conversion unit ADC, PWM unit, FLASH storage unit, serial communication interface SCI, general purpose I/O interface, external SRAM; The output terminal of the input end of described ADC and data acquisition and low-pass filter (10) in the signal condition module is connected, described SCI is connected with the RS232 serial ports with the SCI in wireless communication module, described Flash storage is connected with external SRAM, described digital signal processing module and power module+the 5V output terminal is connected.
7. the fault indicator for overhead lines with voltage detecting function according to claim 1, it is characterized in that: composition and the annexation of described wireless communication module (5) are: comprise ZigBee radio-frequency module, RS232 serial port module, SCI in the ZigBee module is connected with the SCI of digital signal processing module, and the RS232 serial ports is connected with the exterior PC communication port.
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Cited By (10)
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| CN104007294A (en) * | 2014-06-06 | 2014-08-27 | 国家电网公司 | Overhead line parameter measurement wiring device |
| CN104062490A (en) * | 2014-07-16 | 2014-09-24 | 北京师范大学 | Current and temperature measuring sensor |
| CN104237604A (en) * | 2014-08-28 | 2014-12-24 | 国家电网公司 | Current monitoring warning device for overhead transmission line |
| GB2524055A (en) * | 2014-03-13 | 2015-09-16 | Cresatech Ltd | Improvements in or relating to power service monitoring |
| CN105260239A (en) * | 2015-10-19 | 2016-01-20 | 福建奥通迈胜电力科技有限公司 | Function and performance balanced scheduling method for fault indicators |
| CN105629118A (en) * | 2014-11-04 | 2016-06-01 | 国家电网公司 | Outdoor electric power line wireless monitoring system |
| CN108738351A (en) * | 2016-02-12 | 2018-11-02 | 施耐德电器工业公司 | The equipment of the electrical quantity of one phase of the AC electric currents for measuring aerial electrical network |
| CN110134176A (en) * | 2018-09-05 | 2019-08-16 | 江西联智集成电路有限公司 | LDO circuit and wireless charging system |
| CN112731127A (en) * | 2020-12-08 | 2021-04-30 | 贵州电网有限责任公司 | High-voltage circuit breaker multi-dimensional fusion diagnosis device and method |
| CN116865560A (en) * | 2023-09-05 | 2023-10-10 | 深圳市力生美半导体股份有限公司 | Switching power supply output control circuit and output control method |
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| CN105629118A (en) * | 2014-11-04 | 2016-06-01 | 国家电网公司 | Outdoor electric power line wireless monitoring system |
| CN105260239A (en) * | 2015-10-19 | 2016-01-20 | 福建奥通迈胜电力科技有限公司 | Function and performance balanced scheduling method for fault indicators |
| CN105260239B (en) * | 2015-10-19 | 2019-01-11 | 福建奥通迈胜电力科技有限公司 | One kind being used for fault detector functional performance equalization scheduling method |
| CN108738351A (en) * | 2016-02-12 | 2018-11-02 | 施耐德电器工业公司 | The equipment of the electrical quantity of one phase of the AC electric currents for measuring aerial electrical network |
| CN110134176A (en) * | 2018-09-05 | 2019-08-16 | 江西联智集成电路有限公司 | LDO circuit and wireless charging system |
| CN110134176B (en) * | 2018-09-05 | 2024-05-28 | 江西联智集成电路有限公司 | LDO circuit and wireless charging system |
| CN112731127A (en) * | 2020-12-08 | 2021-04-30 | 贵州电网有限责任公司 | High-voltage circuit breaker multi-dimensional fusion diagnosis device and method |
| CN116865560A (en) * | 2023-09-05 | 2023-10-10 | 深圳市力生美半导体股份有限公司 | Switching power supply output control circuit and output control method |
| CN116865560B (en) * | 2023-09-05 | 2023-12-29 | 深圳市力生美半导体股份有限公司 | Switching power supply output control circuit and output control method |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Co-patentee after: Keda Intelligent Technology Co., Ltd. Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510080 Dongfeng East Road, Guangdong, Guangzhou, water, Kong Kong, No. 8 Co-patentee before: Keda Intelligent Technology Co., Ltd. Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |