CN102981105A - Low current earth routing system based on CAN - Google Patents
Low current earth routing system based on CAN Download PDFInfo
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- CN102981105A CN102981105A CN2012105690930A CN201210569093A CN102981105A CN 102981105 A CN102981105 A CN 102981105A CN 2012105690930 A CN2012105690930 A CN 2012105690930A CN 201210569093 A CN201210569093 A CN 201210569093A CN 102981105 A CN102981105 A CN 102981105A
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Abstract
The invention discloses a low current earth routing system based on a CAN (controller area network) and a processing method of the system. The system mainly comprises a plurality of integrated microcomputer protection measurement and control devices capable of calculating and analyzing zero-sequence protection steady state components, wherein the integrated microcomputer protection measurement and control devices are connected by the CAN and share the respective zero-sequence protection steady state components obtained by calculation; when a line has an earth fault, all the protection devices detecting error states share respective zero-sequence component data simultaneously through the CAN; the most likely earth fault spot is found out by a routing principle; and the fault earth is lift by tripping so that the fault is removed securely. According to the low current earth routing system, the protection devices are used for analytical judgment of the steady state data when the earth fault happens, and large-area unwanted operation or refuse operation caused by limitation of a site environment and a single protection device routing condition is avoided effectively.
Description
Technical field
The present invention is a kind of Little Current Ground Connection System, belongs to the relay protection field.
Background technology
The electric power system of China's power distribution network and large industrial enterprise mostly adopts isolated neutral or through the method for operation of grounding through arc, some urban distribution networks are used the resistance eutral grounding method of operation instead in recent years.Mine 6 ~ 10kv electrical network adopts the isolated neutral mode in the past always, and with the lengthening of underground power supply used circuit, capacitance current increases.Arc suppression coil has obtained applying and mainly adopting the earthing mode of arc suppression coil and crosstalk resistance in power system in mines in recent years.
In the actual motion, singlephase earth fault accounts for 80% of total failare; Therefore when small current neutral grounding system generation singlephase earth fault, correctly timely faulty line is detected, to improving power supply reliability, have important practical significance.
Present selection method, great majority all are the separate unit protective relaying devices when earth fault occurs, and detect, the steady-state characteristic during analysis of failure carries out route selection; But during actual generation earth fault, protective relaying device can be subject to system operation mode, circuit length and Load harmonic etc. and be permitted multifactorial impact, and causes falsely dropping, leaks choosing, multiselect.
Summary of the invention
The invention provides a kind of Little Current Ground Connection System, the deficiency of judging to overcome present separate unit Small Electric Current Earthing And Routing Device.
This system is comprised of many computer integrated protections that can detect, analyze the zero-sequence fault lower state; connection by the CAN communication network; when earth fault occurs; all computer integrated protections send in the CAN network and share separately zero-sequence fault steady state measurement data, and can be by data are relatively judged a kind of intelligence system that is grounded route selection.
The technical solution adopted for the present invention to solve the technical problems is: a kind of is the computer integrated protection measure and control device that can detect, analyze the zero-sequence fault lower state, model is PA62, comprise master control borad, power panel, display module, Infrared remote controller, it is characterized in that: outside intake input terminal, relay output end, CAN communication terminal, insulation resistance monitor input terminal all are integrated on the master control borad; External analog amount input terminal links to each other with master control borad by power panel; Display module links to each other with master control borad by communication cable; The outside is opened into control knob and is linked to each other with master control borad by display module; Infrared remote controller links to each other with master control borad by display module.
Above-mentioned computer integrated protection measure and control device, it is further characterized in that: described master control borad is comprised of DSP, ferroelectric memory, sample circuit, relay, and its contained relay is comprised of protection divide-shut brake relay, guard relay, signal relay; Described power panel is comprised of mutual inductor module and power module, and the mutual inductor module is a kind of current-to-voltage converter module; Described display module is comprised of active opening into button, pilot lamp, LCD and infrared remote receiver.
Above-mentioned computer integrated protection measure and control device, it further is characterised in that: power panel offers the master control borad power supply and exports DC110V and DC24V by the power taking of PT three-phase; It also has the communicating circuit part that is integrated on the master control borad, and by the communication interface of photoelectricity isolation, all devices can be connected on the CAN bus.
Above-mentioned computer integrated protection measure and control device; it further is characterised in that: when the line zero sequence voltage was unusual, all detected all unusual protective devices of residual voltage and pass through the relevant steady-state component data upload of CAN interface circuit handle zero-sequenceprotection this moment on the CAN bus.
Above-mentioned computer integrated protection measure and control device; it further is characterised in that: when protective device send the relevant steady-state component of zero-sequenceprotection on the CAN bus after; protective device on all CAN buses receives the zero-sequenceprotection steady-state component that other protective devices send simultaneously; each protective device analysis contrasts the data of all steady-state components; according to the route selection principle; judge real zero-sequence fault point, the protective device delay tripping at this some place.
The steady-state component that above-mentioned zero-sequenceprotection is relevant, it is further characterized in that: steady-state component comprises zero-sequence current value, zero-sequence current direction value, quintuple harmonics zero-sequence current value and quintuple harmonics zero-sequence current direction value.
Above-mentioned route selection principle, it is further characterized in that: route selection principle 1, utilize the colony amplitude comparison principle, use first " maximal value " principle from circuit, to select the circuit of three and above zero-sequence current value maximum, and the circuit of three and above quintuple harmonics zero-sequence current value maximum.
Above-mentioned route selection principle, it is further characterized in that: route selection principle 2, utilize colony than facies principle, from the circuit of selecting, search zero-sequence current direction value and quintuple harmonics zero-sequence current direction value is positive circuit all with the power orientation principle, thereby select faulty line.
Above-mentioned route selection principle, it is further characterized in that: route selection principle 3, for the protective device that prevents from selecting above 1, for the zero-sequence current value maximum protection device of selecting, calculate again the difference of maximum zero sequence current value and second largest zero-sequence current value, if difference compares setting valve greater than zero-sequence current, then zero-sequenceprotection is by time-delay outlet actuation time of adjusting; If difference compares setting valve less than or equal to zero-sequence current, then zero-sequenceprotection increases 1S deferred action outlet again on basis actuation time of adjusting.
Above-mentioned route selection principle; it is further characterized in that: route selection principle 4; if do not select the protective device that satisfies decision condition; use first " maximal value " principle from circuit, to select the circuit of three and above zero-sequence current maximum; then searching zero-sequence current direction value with the power orientation principle from the circuit of selecting is positive circuit, thereby selects faulty line.
Above-mentioned route selection principle, it is further characterized in that: route selection principle 5,3 actions export the protective device of selecting according to route selection principle 4 according to the route selection principle again.
Beneficial effect of the present invention:Computer integrated protection PA62 man-machine interface is friendly, and full Chinese display interface and simple and direct visualized operation are provided; Strong adaptability has multi-protective function, is applicable to multiple primary equipment requirement; Can protect the supporting formation intelligent switchboard system of switch cubicle producer with height, improve the technology content of switch cubicle itself, strengthen the competitive strength of switch cubicle; Integrated and the standardized product structure form of the height of pluralistic function integrates the several functions such as protection, measurement, control, monitoring, communication, record ripple, logout.Outward appearance fashion, volume is little, and modular design is easy to maintenance, reduces cost.
When earth fault appearred in circuit, all detected the protective device of abnormality, shared simultaneously the stable state zero-sequence component data of self by the CAN network, and by the route selection principle, found out most possible earth fault, excised reliably fault.
The analysis of steady state data was judged when this Little Current Ground Connection System utilized many protective devices to earth fault,
Effectively prevent the restriction because of site environment and protecting single device route selection condition, caused the situation of large tracts of land malfunction or tripping.
Description of drawings
Fig. 1 is the general construction block diagram of computer integrated protection among the present invention.
Fig. 2 is the structured flowchart of the part parts of computer integrated protection among the present invention.
Fig. 3 is the structured flowchart of the master control borad of computer integrated protection among the present invention.
Fig. 4 is the structured flowchart of the power panel of computer integrated protection among the present invention.
Fig. 5 is the structured flowchart of the display module of computer integrated protection among the present invention.
Fig. 6 is the CAN network joint synoptic diagram of the embodiment of the invention.
Embodiment
Technical scheme of the present invention is described further by specific embodiment below in conjunction with accompanying drawing.
Computer integrated protection PA62 mainly is comprised of parts such as mainboard (comprising DSP, ferroelectric memory, sample circuit, protection divide-shut brake relay, guard relay etc.), power panel (comprising power module, current-to-voltage converter module, amplifier module etc.), display module and Infrared remote controller.
To shown in Figure 5, be general construction block diagram and each the modular construction block diagram of computer integrated protection PA62 among the present invention such as Fig. 1.
Voltage and current signal after electrical network primary equipment voltage, the current transformer conversion is transformed into weak electric signal through microcomputer protecting device builtin voltage current transformer, be converted to digital quantity through multicircuit switch, operational amplifier, A/D converter, again by DSP process, computing obtains corresponding electric current and voltage value; DSP accepts to open into button signal through pulse signal and switching value input signal (such as circuit-breaker status), the outside of photoelectricity isolation simultaneously; All signals send corresponding breaker tripping and closing signal and alarm signal to driving interface circuit after calculation process, driving circuit is delivered to each relay with these signals, and the breaker tripping and closing relay contact is connected the closing loop of contactor.The measured value of various signals, protection working value, fixed value adjusting all show by LCD.
CAN communication interface by the photoelectricity isolation can make the shared zero-sequenceprotection steady-state component separately of the microcomputer protecting device that is in the same CAN network.
Set up this Little Current Ground Connection System, it needs many computer integrated protection PA62 that can detect, analyze the zero-sequence fault lower state, is undertaken interconnected by the CAN network each other.Fig. 6 is the CAN network joint synoptic diagram of the embodiment of the invention.Its step is:
Step 1: during normal operation, protective device does not send data in the CAN network;
Step 2: when earth fault occured, all protective devices that detect abnormality were shared zero-sequenceprotection steady-state component separately mutually;
Step 3: all protective devices obtain the zero-sequenceprotection steady-state component of other protective devices by the CAN network, analyze, relatively according to the route selection principle, judge actual most possible faulty line; Fault is eliminated in the action outlet.
Comprise algorithm design, Software for Design and hardware design part in the invention in the design proposal of route selection principle.
1, algorithm design: the core algorithm of route selection principle is that protective device is analyzed, compared zero-sequenceprotection steady-state components all in the CAN network in the invention, judges.
(1) when normal operation, the PA62 device not uploading data to the CAN bus;
(2) when earth fault occurs, all detect the zero-sequenceprotection steady-state component that the PA62 device of residual voltage abnormal state detects self and upload on the CAN bus;
(3) the PA62 device utilizes the colony amplitude comparison principle according to route selection principle 1, selects the circuit that part may break down;
(4) the PA62 device utilizes colony than facies principle according to route selection principle 2, again screens the circuit that may break down;
(5) the PA62 device is according to route selection principle 3,4,5, and final judgement filters out earth fault line.
When circuit generation earth fault, through above step, all relevant PA62 devices are judged through zero-sequenceprotection steady-state component data analysis, comparison to sharing, finally select earth fault line, excise accurately and effectively earth fault.
2, Software for Design: the route selection principle is processed and is divided at software in the invention: zero-sequenceprotection steady-state component calculation procedure, data upload are to CAN network program and route selection determining program.
Zero-sequenceprotection steady-state component calculation procedure: when earth fault occurs; single protective device receives residual voltage value, zero-sequence current value by analog input, and calculates zero-sequence current direction value, quintuple harmonics zero-sequence current value and quintuple harmonics zero-sequence current direction value.
Data upload is to the CAN network program: when earth fault occurs; single protective device is fixed the relevant steady-state component of the zero-sequenceprotection of calculating with a frame data length; send in the CAN network by the CAN communication chip; and receive simultaneously the zero-sequenceprotection steady-state component data of other devices; numbering according to other devices; these data are stored in order in the register of self, are used for analyzing and judge.
The route selection determining program: single protective device, is then judged and is judged whether itself is earth fault if self meet the route selection principle according to the route selection principle, deferred action outlet, excision earth fault.
3, hardware design: the route selection principle is processed and is comprised CAN transceiver, DSP in the invention.DSP is the nucleus module that the route selection principle is processed, and finishes reception, calculating and route selection etc. to zero sequence steady-state component data.
Although the present invention is with preferred embodiment openly as above, they are not to limit the present invention, anyly have the knack of this skill person, without departing from the spirit and scope of the invention, and certainly when can making various changes or retouch, but equally within protection scope of the present invention.What therefore protection scope of the present invention should be defined with the application's claim protection domain is as the criterion.
Claims (12)
1. one kind is the computer integrated protection measure and control device that can detect, analyze the zero-sequence fault lower state, comprise master control borad, power panel, display module, Infrared remote controller, it is characterized in that: it comprises that also external analog amount input terminal, outside open into control knob, is integrated with outside intake input terminal, relay output end, CAN communication terminal, insulation resistance monitor input terminal on the described master control borad; Described external analog amount input terminal links to each other with master control borad by described power panel; Described display module links to each other with described master control borad by communication cable; Described outside is opened into control knob and is linked to each other with master control borad by described display module; Described Infrared remote controller links to each other with master control borad by described display module.
2. computer integrated protection measure and control device according to claim 1, it is characterized in that: described master control borad is comprised of digital signal processor DSP, ferroelectric memory, sample circuit, relay, and described relay is comprised of protection divide-shut brake relay, guard relay, signal relay; Described power panel is comprised of mutual inductor module and power module, and described mutual inductor module is a kind of current-to-voltage converter module; Described display module is comprised of active opening into button, pilot lamp, LCD and infrared remote receiver.
3. computer integrated protection measure and control device according to claim 2 is characterized in that: described power panel offers the master control borad power supply and exports DC110V and DC24V by the threephase potential transformer power taking.
4. computer integrated protection measure and control device according to claim 2, it is characterized in that: it also has the communicating circuit part that is integrated on the master control borad, and by the communication interface of photoelectricity isolation, all devices can be connected on the CAN bus.
5. Little Current Ground Connection System based on the CAN network; comprise the described computer integrated protection measure and control device that can detect, analyze the zero-sequence fault lower state of one of a plurality of claims 1 to 4; it is characterized in that: arbitrary described computer integrated protection measure and control device; by the CAN network; receive the zero-sequenceprotection steady-state component of other computer integrated protection measure and control devices; by the route selection principle, judge earth fault, tripping operation disconnects this earth fault.
6. Little Current Ground Connection System according to claim 5; it is characterized in that: when the line zero sequence voltage was unusual, all detected all unusual protective devices of residual voltage and pass through the relevant steady-state component data upload of CAN interface circuit handle zero-sequenceprotection this moment on the CAN bus.
7. Little Current Ground Connection System according to claim 6; it is characterized in that: when the computer integrated protection measure and control device send the relevant steady-state component of zero-sequenceprotection on the CAN bus after; computer integrated protection measure and control device on all CAN buses receives the zero-sequenceprotection steady-state component that other computer integrated protection measure and control devices send simultaneously; each computer integrated protection measure and control device analysis contrasts the data of all steady-state components; according to the route selection principle; judge real zero-sequence fault point; the protective device at this some place is after time-delay, and the tripping relay action exports.
8. Little Current Ground Connection System according to claim 7 is characterized in that: be used for the zero-sequenceprotection steady-state component that the route selection principle judges and comprise zero-sequence current value, zero-sequence current direction value, quintuple harmonics zero-sequence current value and quintuple harmonics zero-sequence current direction value.
9. route selection principle disposal route that realizes the described Little Current Ground Connection System of one of claim 5 to 8 is characterized in that following steps:
Step 1: during normal operation, the computer integrated protection measure and control device does not send data in the CAN network;
Step 2: when earth fault occured, all computer integrated protection measure and control devices that detect abnormality were shared zero-sequenceprotection steady-state component separately mutually;
Step 3: all computer integrated protection measure and control devices obtain the zero-sequenceprotection steady-state component of other computer integrated protection measure and control devices by the CAN network, analyze, relatively according to the route selection principle, judge actual most possible faulty line; Fault is eliminated in the action outlet.
10. route selection principle disposal route according to claim 9 is characterized in that:
Route selection principle one is utilized the colony amplitude comparison principle, uses first " maximal value " principle to select the circuit of three and above zero-sequence current value maximum from circuit, and the circuit of three and above quintuple harmonics zero-sequence current value maximum;
Route selection principle two utilizes colony than facies principle, searches zero-sequence current direction value and quintuple harmonics zero-sequence current direction value is positive circuit all from the circuit of selecting with the power orientation principle, thereby selects faulty line.
11. route selection principle disposal route according to claim 10 is characterized in that:
Route selection principle three, for the computer integrated protection measure and control device that prevents from selecting above 1, for the maximum computer integrated protection measure and control device of the zero-sequence current value of selecting, calculate again the difference of maximum zero sequence current value and second largest zero-sequence current value, if difference compares setting valve greater than zero-sequence current, then zero-sequenceprotection is by time-delay outlet actuation time of adjusting; If difference compares setting valve less than or equal to zero-sequence current, then zero-sequenceprotection increases 1S deferred action outlet again on basis actuation time of adjusting;
Route selection principle four; if do not select the computer integrated protection measure and control device that satisfies decision condition; use first " maximal value " principle from circuit, to select the circuit of three and above zero-sequence current maximum; then searching zero-sequence current direction value with the power orientation principle from the circuit of selecting is positive circuit, thereby selects faulty line.
12. route selection principle disposal route according to claim 11 is characterized in that:
Route selection principle five, three actions export the computer integrated protection measure and control device of selecting according to route selection principle four according to the route selection principle again.
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| CN107290628A (en) * | 2017-07-10 | 2017-10-24 | 合肥东玖电气有限公司 | A kind of line-selected earthing device based on low current |
| CN107462803A (en) * | 2017-09-25 | 2017-12-12 | 南京瑞博特电气有限公司 | A kind of magnetic suspension train supply line plus earth selection method |
| CN112130091A (en) * | 2020-09-24 | 2020-12-25 | 中国南方电网有限责任公司超高压输电公司梧州局 | Multi-source data-based single-phase grounding on-line monitoring method for ungrounded system of transformer substation |
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| CN107462803A (en) * | 2017-09-25 | 2017-12-12 | 南京瑞博特电气有限公司 | A kind of magnetic suspension train supply line plus earth selection method |
| CN107462803B (en) * | 2017-09-25 | 2019-11-01 | 南京瑞博特电气有限公司 | A kind of magnetic suspension train power supply line plus earth selection method |
| CN112130091A (en) * | 2020-09-24 | 2020-12-25 | 中国南方电网有限责任公司超高压输电公司梧州局 | Multi-source data-based single-phase grounding on-line monitoring method for ungrounded system of transformer substation |
| CN112130091B (en) * | 2020-09-24 | 2023-12-12 | 中国南方电网有限责任公司超高压输电公司梧州局 | Single-phase grounding online monitoring method for substation ungrounded system based on multi-source data |
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