CN103441470A - Electric leakage protection system based on DSP - Google Patents

Electric leakage protection system based on DSP Download PDF

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Publication number
CN103441470A
CN103441470A CN201310370331XA CN201310370331A CN103441470A CN 103441470 A CN103441470 A CN 103441470A CN 201310370331X A CN201310370331X A CN 201310370331XA CN 201310370331 A CN201310370331 A CN 201310370331A CN 103441470 A CN103441470 A CN 103441470A
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China
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control device
protection system
leakage protection
dsp
unit
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CN201310370331XA
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CN103441470B (en
Inventor
高鹏
莫兴洋
罗奕
唐焱
叶仿拥
蒋占四
张斌
陈金龙
高成
林伟通
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Guilin University of Electronic Technology
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Guilin University of Electronic Technology
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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

A kind of leakage protection system based on DSP
Technical field
The present invention relates to electric power system, specifically a kind of leakage protection system based on DSP.
Background technology
Current down-hole feed master switch and branch switch principle in the underground leakage protection system, master switch QF1 place so adopts the additional dc power supply inspection technique, adopts zero-sequence current amplitude comparison method, colony amplitude comparison phase comparing method and zero sequence power direction method in branch switch.Adopt the algorithm more complicated of these methods in branch road, sampling quantity is many, the systematic comparison complexity of formation; Adopt the RS485 bus at the side signal transmission face, 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 the signal connecting system, adopt the I/O mouth of the AD conversion of direct access controller, along with improving constantly that modern production requires, the situation that controller is controlled a plurality of unit simultaneously becomes, and this connection presents the phenomenon of wasting a large amount of I/O resources; Aspect controller, adopt single-chip microcomputer or complete than the chip of lowest version, controller can not meet the requirement of modern production like this; Some systems do not have perfect human-computer dialogue unit yet.
Summary of the invention
The objective of the invention is will be for overcoming the deficiency existed in traditional leakage protection system; and provide a kind of leakage protection system based on DSP; this system is compared with traditional leakage protection system, and not only system is optimized more, and performance has also obtained further improvement.
The technical scheme that realizes the object of the invention is:
A kind of leakage protection system based on DSP, be comprised of with the data acquisition unit be connected with control device respectively, human-computer dialogue device, final controlling element control device.
Described data acquisition unit consists of zero-sequence current, phase current sampling unit, residual voltage sampling unit, low pass filter, A/D converter, first signal modulate circuit, secondary signal modulate circuit, analog switch and photoelectric isolation module; The residual voltage sampling unit is connected with control device by the secondary signal modulate circuit; After zero-sequence current, phase current sampling unit, low pass filter, first signal modulate circuit, A/D converter are linked in sequence, by the CAN bus, with photoelectric isolation module, be connected, photoelectric isolation module is connected with analog switch, and analog switch is connected with control device.
Described control device is by the dsp controller that adopts the TMS320C6678 chip to form.
Described human-computer dialogue device is connected and composed by print unit, display unit, keyboard input unit and alarm unit, wherein:
Print unit: after being connected to printer, can directly print required data or the physical quantity of current operation;
Display unit: be used for display routine init state, operation of power networks state, keyboard input state;
Keyboard input unit: the physical quantity that is used for setting initial value and running status;
Alarm unit: when running status and set state when inconsistent, when the electric leakage accident occurs, immediately sound, to reach the warning reminding effect.
Described final controlling element is connected to form by relay and release unit.
Advantage of the present invention is:
1. by the present invention, system has obtained obvious optimization.This system is aspect controller, with a TMS320C6678 control chip and an AD conversion chip, just can realize, the MCU chip that system in the past accesses respectively at each switch-dividing place adds the DSP control chip, make system complex, and the simultaneity factor that native system reduces costs has also obtained obvious optimization.
2. native system is carrying out transmission of digital signals with the CAN fieldbus, meets the needs of down-hole length apart from detection of electrical leakage.
This system the CAN bus with first with analog switch, be connected before dsp controller is connected, analog switch is connected with the I/O mouth of dsp controller again, to reduce the occupancy of I/O mouth resource, when for meeting, controlling larger a kind of mentality of designing of system, needs more I/O mouth Resource Supply with DSP in the future, also make control system simpler.
This system the time during detection of electrical leakage: master switch place additional dc power supply detection method adopts the zero-sequence current characteristic quantity to realize selective earth leakage protection at the switch-dividing place.The 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; can effectively solve that selective earth leakage protection sensitivity in electric power system on a small scale is low, the technical barrier of poor reliability, while detecting simultaneously, only need detect electric current is sampled, 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 electric leakage occurs when, CPU produces interruption, can, at enough short time internal cutting off electric leakage branch road, avoid the accident occurred because of electric leakage.Simultaneously, reduce widely CPU each tributary signal time used that constantly scanning is transmitted by change over switch, make system further optimize and provide safeguard.
6. the present invention for the monitor staff provides a safety, improved and human-computer dialogue platform easily, can directly monitor the operation conditions of electrical network by this platform, thereby meet the requirement of the automatic technology of development simultaneously.
The accompanying drawing explanation
The structured flowchart that Fig. 1 is leakage protection system of the present invention.
Fig. 2 is feed master switch and branch switch schematic diagram.
The connection block diagram that Fig. 3 is each unit in leakage protection system of the present invention.
Embodiment
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; by the DSP control device, with the data acquisition unit be connected with the DSP control device respectively, human-computer dialogue device, final controlling element, formed; data acquisition unit carries out communication by CAN bus and DSP control device, and the DSP control device carries out communication by CAN bus and final controlling element and human-computer dialogue device again.Wherein:
The DSP control device is the TMS320C6678 dsp controller cell formation by 2000 series of IT company production;
Data acquisition unit consists of zero-sequence current, phase current sampling unit, residual voltage sampling unit, low pass filter, A/D converter, first signal modulate circuit, secondary signal modulate circuit, analog switch and photoelectric isolation module; The residual voltage sampling unit is connected with control device by the secondary signal modulate circuit; After zero-sequence current, phase current sampling unit, low pass filter, first signal modulate circuit, A/D converter are linked in sequence, by the CAN bus, with photoelectric isolation module, be connected, photoelectric isolation module is connected with analog switch, and analog switch is connected with control device.
The human-computer dialogue device consists of print unit, display unit, keyboard input unit and alarm unit;
Final controlling element consists of relay and release;
As shown in Figure 3, during work, the sampling zero-sequence current and the phase current that by current transformer, from electrical network, collect, adopt the additional dc power supply method to realize the continuous detecting to line insulation resistance at master switch QF1 place; At switch-dividing QF2 place, adopt the zero-sequence current characteristic quantity to realize selecting earth leakage protective.The signal that each branch road collects is through low pass filter, the first signal modulate circuit, after the A/D conversion, utilize Field Bus CAN will change next digital signal after the isolation of photoelectric isolation module photoelectricity, pass to the analog switch place, give again dsp controller, photoelectric isolation module can improve antijamming capability, dsp controller utilizes the zero-sequence current characteristic to judge that the branch road that constantly scans the sample rate current that each branch road transmits by analog switch has or not electric leakage by programming, the residual voltage sampling unit is in feeding switch master switch QF1 place, gather sampling voltage and additional direct voltage and directly deliver to the I/O mouth place of the A/D conversion of dsp controller after the secondary signal modulate circuit, processing through dsp controller, complete the insulation resistance continuous detecting to total switch circuit, and the performance element at master switch QF1 place is sent to corresponding instruction.In the human-computer dialogue device, alarm unit, display unit, print unit and keyboard input unit are realized real-time communication by CAN bus and dsp controller, dsp controller sends warning to the relevant information of processing by alarm unit, by display unit display system running status, and information exchange is crossed to print unit print, finally by the keyboard input unit, input required instruction.

Claims (5)

1. the leakage protection system based on DSP; by control device, with the data acquisition unit be connected with control device respectively, human-computer dialogue device, final controlling element, formed; data acquisition unit carries out communication by CAN bus and control device, and the DSP control device carries out communication by CAN bus and final controlling element and human-computer dialogue device again.
2. leakage protection system according to claim 1, it is characterized in that: described data acquisition unit consists of zero-sequence current, phase current sampling unit, residual voltage sampling unit, low pass filter, A/D converter, first signal modulate circuit, secondary signal modulate circuit, analog switch and photoelectric isolation module; The residual voltage sampling unit is connected with control device by the secondary signal modulate circuit; After zero-sequence current, phase current sampling unit, low pass filter, first signal modulate circuit, A/D converter are linked in sequence, by the CAN bus, with photoelectric isolation module, be connected, photoelectric isolation module is connected with analog switch, and analog switch is connected with control device.
3. leakage protection system according to claim 1, is characterized in that: the dsp controller that described control device consists of employing TMS320C6678 chip.
4. leakage protection system according to claim 1, it is characterized in that: described human-computer dialogue device is connected and composed by print unit, display unit, keyboard input unit and alarm unit.
5. leakage protection system according to claim 1, it is characterized in that: described final controlling element is connected to form by relay and release.
CN201310370331.XA 2013-08-23 2013-08-23 Electric leakage protection system based on DSP Active CN103441470B (en)

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CN103441470B CN103441470B (en) 2015-03-25

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Citations (5)

* Cited by examiner, † Cited by third party
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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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