CN103441470B - Electric leakage protection system based on DSP - Google Patents
Electric leakage protection system based on DSP Download PDFInfo
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- CN103441470B CN103441470B CN201310370331.XA CN201310370331A CN103441470B CN 103441470 B CN103441470 B CN 103441470B CN 201310370331 A CN201310370331 A CN 201310370331A CN 103441470 B CN103441470 B CN 103441470B
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Abstract
The invention discloses an electric leakage protection system based on a DSP. The electric leakage protection system is characterized by being composed of a data acquisition device, a DSP control device, a man-machine conversation device and an executing device, wherein the DSP control device is connected with the data acquisition device, and the man-machine conversation device and the executing device are respectively connected with the DSP control device. The data acquisition device is communicated with the DSP control device through a CAN bus. The DSP control device is further communicated with the executing device and the man-machine conversation device through the CAN bus. According to the electric leakage protection system, the safety performance of a circuit can be improved through real-time monitoring on the power grid circuit. The electric leakage protection system is suitable for an underground power supply system with neutrals not connected with the ground and a power supply system with neutrals connected with the ground through arc suppression coils, improves the reliability of selective electric leakage motions and ensures the stability of motion values. When control is interrupted, the time is shorter than 1 nanosecond, and the speed enables the underground safety performance to be greatly improved.
Description
Technical field
The present invention relates to power system, specifically a kind of leakage protection system based on DSP.
Background technology
Down-hole feed master switch at present in underground leakage protection system and branch switch principle, master switch QF1 place so adopts additional dc power supply inspection technique, adopts zero-sequence current amplitude com parison method, colony amplitude comparison phase comparing method and zero sequence power direction method in branch switch.In branch road, adopt the method comparison of these methods complicated, sampling quantity is many, and the systematic comparison of formation is complicated; In Signal transmissions, adopt RS485 bus, the distance of this bus transfer is less than one kilometer, can not meet the requirement of current coal production long distance power delivery; In signal connecting system, adopt the I/O mouth of the AD conversion of direct access controller, what require along with modern production improves constantly, and the situation that controller controls multiple unit simultaneously become, and this connection presents the phenomenon of wasting a large amount of I/O resources; In controller, then adopt single-chip microcomputer or come compared with the chip of lowest version, such controller can not meet the requirement of modern production; The human-computer dialogue unit that some systems are imperfect yet.
Summary of the invention
The object of the invention is will for overcoming the deficiency existed in traditional leakage protection system; and a kind of leakage protection system based on DSP is provided; this system is compared with traditional leakage protection system, and not only system is optimized more, and performance have also been obtained further improvement.
The technical scheme realizing the object of the invention is:
Based on a leakage protection system of DSP, be made up of with the data acquisition unit be connected with control device respectively, human-computer dialogue device, actuating unit control device.
Described data acquisition unit is made up of zero-sequence current, phase current sampling unit, zero-sequence voltage samples unit, low pass filter, A/D converter, the first signal conditioning circuit, secondary signal modulate circuit, analog switch and photoelectric isolation module; Zero-sequence voltage samples unit is connected with control device by secondary signal modulate circuit; After zero-sequence current, phase current sampling unit, low pass filter, the first signal conditioning circuit, A/D converter are linked in sequence, be connected with photoelectric isolation module by CAN, photoelectric isolation module is connected with analog switch, and analog switch is connected with control device.
Described control device is by the dsp controller adopting TMS320C6678 chip to form.
Described human-computer dialogue device is connected and composed by print unit, display unit, key input unit and alarm unit, wherein:
Print unit: after being connected to printer, directly can print the physical quantity of required data or current operation;
Display unit: be used for display routine init state, operation of power networks state, input through keyboard state;
Key input unit: the physical quantity being used for setting initial value and running status;
Alarm unit: when running status and set state inconsistent time, as occur electric leakage accident time, immediately sound, to reach warning reminding effect.
Described actuating unit is connected to form by relay and electrical apparatus release unit.
Advantage of the present invention is:
1., by the present invention, system obtains obvious optimization.This system is in controller, just can realize by one piece of TMS320C6678 control chip and one piece of AD conversion chip, the MCU chip that system in the past accesses respectively at each switch-dividing place adds DSP control chip, make system complex, and the simultaneity factor that native system reduces costs have also been obtained obvious optimization.
2. native system is carrying out transmission of digital signals with CAN fieldbus, meets the needs of down-hole long distance detection of electrical leakage.
3. this system was first connected with analog switch before CAN is connected with dsp controller, analog switch is connected with the I/O mouth of dsp controller again, to reduce the occupancy of I/O mouth resource, for DSP in satisfied future control larger system, needs more I/O mouth resource also makes control system simpler while providing a kind of mentality of designing.
4. this system time detection of electrical leakage time: master switch place additional dc power supply detection method, adopts zero-sequence current characteristic quantity to realize selective earth leakage protection at switch-dividing place.Zero-sequence current characteristic quantity only relates to the characteristic quantity of electric current; simple with reference to electric parameters; improve interference performance strong; highly sensitive; effectively can solve that selective earth leakage protection sensitivity on a small scale electric power system is low, the technical barrier of poor reliability, only need detect when detecting simultaneously and sample to electric current, the device of use is simple; it is easier to implement, and system is further optimized.
5. the control unit related in the present invention, in this unit kernel control chip adopt TMS320C6678, the dominant frequency of this chip is 1.5GHz, instruction cycle is 0.67ns, when there is electric leakage, CPU produces interruption, at enough short time internal cutting off electric leakage branch road, can avoid the accident occurred because of electric leakage.Meanwhile, reduce CPU widely and constantly scan each tributary signal of being transmitted by change-over switch time used, system is optimized further and provides safeguard.
6. the present invention is simultaneously for monitor staff provides a safety, improves and human-computer dialogue platform easily, directly can be monitored the operation conditions of electrical network, thus meet the requirement of the automatic technology of development by this platform.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of leakage protection system of the present invention.
Fig. 2 is feed master switch and branch switch schematic diagram.
Fig. 3 is the connection block diagram of each unit in leakage protection system of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and the specific embodiments, the invention will be further described:
As shown in Figure 1; a kind of leakage protection system based on DSP; be made up of with the data acquisition unit be connected with DSP control device respectively, human-computer dialogue device, actuating unit DSP control device; data acquisition unit carries out communication by CAN and DSP control device, and DSP control device carries out communication by CAN and actuating unit and human-computer dialogue device again.Wherein:
DSP control device is that the TMS320C6678 dsp controller unit of 2000 series of being produced by IT company is formed;
Data acquisition unit is made up of zero-sequence current, phase current sampling unit, zero-sequence voltage samples unit, low pass filter, A/D converter, the first signal conditioning circuit, secondary signal modulate circuit, analog switch and photoelectric isolation module; Zero-sequence voltage samples unit is connected with control device by secondary signal modulate circuit; After zero-sequence current, phase current sampling unit, low pass filter, the first signal conditioning circuit, A/D converter are linked in sequence, be connected with photoelectric isolation module by CAN, photoelectric isolation module is connected with analog switch, and analog switch is connected with control device.
Human-computer dialogue device is made up of print unit, display unit, key input unit and alarm unit;
Actuating unit is made up of relay and electrical apparatus release;
As shown in Figure 3, during work, the sampling zero-sequence current collected from electrical network by current transformer and phase current, realize the continuous detection to line insulation resistance in master switch QF1 place employing additional dc power supply method; At switch-dividing QF2 place, then zero-sequence current characteristic quantity is adopted to realize selecting earth leakage protective.The signal that each branch road collects is through low pass filter, first signal conditioning circuit, after A/D conversion, Field Bus CAN is utilized to change next data signal after photoelectric isolation module Phototube Coupling, pass to analog switch place, give dsp controller again, photoelectric isolation module can improve antijamming capability, dsp controller utilizes zero-sequence current characteristic to judge by programming and constantly scans the branch road of the sample rate current that each branch road transmits with or without electric leakage by analog switch, zero-sequence voltage samples unit is in feeding switch master switch QF1 place, collection sampling voltage and additional DC voltage directly deliver to the I/O mouth place of the A/D conversion of dsp controller after secondary signal modulate circuit, through the process of dsp controller, complete and the insulaion resistance of total switch circuit is detected continuously, and corresponding instruction is sent to the performance element at master switch QF1 place.In human-computer dialogue device, alarm unit, display unit, print unit and key input unit realize real-time communication by CAN and dsp controller, dsp controller sends warning the relevant information of process by alarm unit, by display unit display system running status, and information is printed by print unit, finally by the instruction needed for key input unit input.
Claims (1)
1., based on a leakage protection system of DSP, comprise DSP control device and data acquisition unit, it is characterized in that:
Described DSP control device is TMS320C6678 dsp controller, this controller is connected with data acquisition unit, human-computer dialogue device and actuating unit respectively, data acquisition unit carries out communication by CAN and control device, and DSP control device carries out communication by CAN and actuating unit and human-computer dialogue device again;
Described data acquisition unit is made up of zero-sequence current, phase current sampling unit, zero-sequence voltage samples unit, low pass filter, A/D converter, the first signal conditioning circuit, secondary signal modulate circuit, analog switch and photoelectric isolation module; Zero-sequence voltage samples unit is connected with control device by secondary signal modulate circuit; After zero-sequence current, phase current sampling unit, low pass filter, the first signal conditioning circuit, A/D converter are linked in sequence, be connected with photoelectric isolation module by CAN, photoelectric isolation module is connected with analog switch, and analog switch is connected with control device;
Described human-computer dialogue device is connected and composed by print unit, display unit, key input unit and alarm unit;
Described actuating unit is connected to form by relay and electrical apparatus release.
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| CN201310370331.XA CN103441470B (en) | 2013-08-23 | 2013-08-23 | Electric leakage protection system based on DSP |
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| CN201310370331.XA CN103441470B (en) | 2013-08-23 | 2013-08-23 | Electric leakage protection system based on DSP |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201063435Y (en) * | 2007-06-12 | 2008-05-21 | 辽宁工程技术大学 | Mine high voltage intelligent switch protector |
| CN201398062Y (en) * | 2009-05-12 | 2010-02-03 | 张国军 | Mine switch intelligent integrated protector |
| CN102904209A (en) * | 2012-11-01 | 2013-01-30 | 四川省电力公司资阳公司 | Digital signal processing (DSP)-based current separation motion type electric leakage protection device and method |
| CN202840479U (en) * | 2012-10-24 | 2013-03-27 | 重庆飞尔达机械有限责任公司 | Underground coal mine high-voltage switch protector |
| CN203149066U (en) * | 2013-04-18 | 2013-08-21 | 安徽巨森电器有限公司 | Distributed on-line insulation monitoring device for electrical network operation equipment |
-
2013
- 2013-08-23 CN CN201310370331.XA patent/CN103441470B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201063435Y (en) * | 2007-06-12 | 2008-05-21 | 辽宁工程技术大学 | Mine high voltage intelligent switch protector |
| CN201398062Y (en) * | 2009-05-12 | 2010-02-03 | 张国军 | Mine switch intelligent integrated protector |
| CN202840479U (en) * | 2012-10-24 | 2013-03-27 | 重庆飞尔达机械有限责任公司 | Underground coal mine high-voltage switch protector |
| CN102904209A (en) * | 2012-11-01 | 2013-01-30 | 四川省电力公司资阳公司 | Digital signal processing (DSP)-based current separation motion type electric leakage protection device and method |
| CN203149066U (en) * | 2013-04-18 | 2013-08-21 | 安徽巨森电器有限公司 | Distributed on-line insulation monitoring device for electrical network operation equipment |
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Application publication date: 20131211 Assignee: Guilin Intelligent Technology Co.,Ltd. Assignor: GUILIN University OF ELECTRONIC TECHNOLOGY Contract record no.: X2023980044266 Denomination of invention: A Leakage Protection System Based on DSP Granted publication date: 20150325 License type: Common License Record date: 20231025 |
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Assignee: Guilin Intelligent Technology Co.,Ltd. Assignor: GUILIN University OF ELECTRONIC TECHNOLOGY Contract record no.: X2023980044266 Date of cancellation: 20231201 |
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Application publication date: 20131211 Assignee: Guilin Intelligent Technology Co.,Ltd. Assignor: GUILIN University OF ELECTRONIC TECHNOLOGY Contract record no.: X2023980050657 Denomination of invention: A leakage protection system based on DSP Granted publication date: 20150325 License type: Common License Record date: 20231207 |