CN203037795U - Small current grounding line selection system based on CAN network - Google Patents
Small current grounding line selection system based on CAN network Download PDFInfo
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- CN203037795U CN203037795U CN 201220723076 CN201220723076U CN203037795U CN 203037795 U CN203037795 U CN 203037795U CN 201220723076 CN201220723076 CN 201220723076 CN 201220723076 U CN201220723076 U CN 201220723076U CN 203037795 U CN203037795 U CN 203037795U
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Abstract
The utility model discloses a small current grounding line selection system based on a CAN network. The system mainly comprises microcomputer integrated protection measurement and control devices which calculate and analyze zero-sequence protection steady components. A number of microcomputer integrated protection measurement and control devices are connected through the CAN network and share the zero-sequence protection steady components which are calculated by the microcomputer integrated protection measurement and control devices. When a line has a grounding fault, all protection devices which detect the abnormal state simultaneously share own steady zero-sequence component data through the CAN network. Through the principle of line selection, the most possible grounding fault point is found out, and then the grounding fault is cut off by tripping, thus the fault is reliably cut off. According to the small current grounding line selection system, a number of protection devices are used to analyze and judge the steady data when the grounding fault occurs, which effectively prevents the situation of extensive misoperation or maloperation, wherein the situation is caused by the limitations of the field environment and the line selection condition of a single protection device.
Description
Technical field
The present invention is a kind of small current earthing wire-selecting 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 takes place, and detect, the steady-state characteristic during analysis of failure carries out route selection; But when earth fault took place reality, protective relaying device can be subjected to the influence of many factors such as system operation mode, circuit length and load harmonic wave, and causes falsely dropping, leaks choosing, multiselect.
Summary of the invention
The invention provides a kind of small current earthing wire-selecting system, to overcome the deficiency that present separate unit Small Electric Current Earthing And Routing Device is judged.
This system is made up of many computer integrated protections that can detect, analyze the zero-sequence fault lower state; connection by the CAN communication network; when earth fault takes place; 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: the outside amount of opening 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 made up of DSP, ferroelectric memory, sample circuit, relay, and its contained relay is made up of protection divide-shut brake relay, guard relay, signal relay; Described power panel is made up 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 made up 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 that photoelectricity is isolated, 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 colony than width of cloth principle, from circuit, select earlier the circuit of the circuit of three and above zero-sequence current value maximum and three and above quintuple harmonics zero-sequence current value maximum with " maximal value " principle.
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 the difference of maximum zero sequence current value and second largest zero-sequence current value again, 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 smaller 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; from circuit, select earlier the circuit of three and above zero-sequence current maximum with " maximal value " principle; searching zero-sequence current direction value with the power orientation principle from the circuit of selecting then 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 close friend provides complete Chinese display interface and simple and direct visualized operation; Adaptability is strong, has the kinds of protect 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 multiple 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 the stable state zero-sequence component data of self simultaneously by the CAN network, and by the route selection principle, found out most possible earth fault, excised fault reliably.
The analysis and judgement of steady state data when this small current earthing wire-selecting system utilizes 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 made up 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 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 handle, computing obtains corresponding electric current and voltage value; DSP accepts to open into button signal through pulse signal and switching value input signal (as circuit-breaker status), outside that photoelectricity is isolated 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.
The CAN communication interface of isolating by photoelectricity 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 small current earthing wire-selecting 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 operate as normal, protective device does not send data in the CAN network;
Step 2: when earth fault took place, 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 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) during operate as normal, the PA62 device is not uploaded data to the CAN bus;
(2) when earth fault takes place, all PA62 devices that detect the residual voltage abnormal state upload to self detected zero-sequenceprotection steady-state component on the CAN bus;
(3) the PA62 device utilizes colony than width of cloth 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, screens the circuit that may break down again;
(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 the zero-sequenceprotection steady-state component data of sharing are analyzed, compared, and finally select earth fault line, excise earth fault accurately and effectively.
2, software design: the route selection principle is handled 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 takes place; single protective device receives residual voltage value, zero-sequence current value by the analog quantity 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 takes place; 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 the zero-sequenceprotection steady-state component data of other devices simultaneously; numbering according to other devices; these data are stored in order in the register of self, are used for analysis and judgement.
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 handled and is comprised CAN transceiver, DSP in the invention.The nucleus module that DSP handles for the route selection principle is finished reception, calculating and route selection etc. to zero sequence steady-state component data.
Though 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 doing various variations or retouching, 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 (2)
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 the outside on the described master control borad and opens into amount input terminal, relay output end, CAN communication terminal, insulation resistance monitor input terminal; 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;
Described master control borad is made up of digital signal processor DSP, ferroelectric memory, sample circuit, relay, and described relay is made up of protection divide-shut brake relay, guard relay, signal relay; Described power panel is made up 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 made up of active opening into button, pilot lamp, LCD and infrared remote receiver;
It also has the communicating circuit part that is integrated on the master control borad, and by the communication interface that photoelectricity is isolated, all devices can be connected on the CAN bus.
2. computer integrated protection measure and control device according to claim 1 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220723076 CN203037795U (en) | 2012-12-25 | 2012-12-25 | Small current grounding line selection system based on CAN network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220723076 CN203037795U (en) | 2012-12-25 | 2012-12-25 | Small current grounding line selection system based on CAN network |
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| CN203037795U true CN203037795U (en) | 2013-07-03 |
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| CN 201220723076 Expired - Lifetime CN203037795U (en) | 2012-12-25 | 2012-12-25 | Small current grounding line selection system based on CAN network |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981105A (en) * | 2012-12-25 | 2013-03-20 | 南京因泰莱电器股份有限公司 | Low current earth routing system based on CAN |
| CN104007368A (en) * | 2014-06-17 | 2014-08-27 | 漳州市锦成电力设备有限公司 | High-voltage electric wire fault detecting system based on CAN bus |
| CN104991163A (en) * | 2015-06-23 | 2015-10-21 | 国网甘肃省电力公司天水供电公司 | Single-phase phase-selection system |
| CN107255774A (en) * | 2017-06-16 | 2017-10-17 | 济南置真电气有限公司 | It is a kind of based on the selection method for falsely dropping line tripping combined floodgate information |
| CN108508314A (en) * | 2018-02-24 | 2018-09-07 | 安徽合凯电气科技股份有限公司 | A kind of high-precision route selection tripgear |
-
2012
- 2012-12-25 CN CN 201220723076 patent/CN203037795U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981105A (en) * | 2012-12-25 | 2013-03-20 | 南京因泰莱电器股份有限公司 | Low current earth routing system based on CAN |
| CN102981105B (en) * | 2012-12-25 | 2015-12-23 | 南京因泰莱电器股份有限公司 | Based on the Little Current Ground Connection System of CAN network |
| CN104007368A (en) * | 2014-06-17 | 2014-08-27 | 漳州市锦成电力设备有限公司 | High-voltage electric wire fault detecting system based on CAN bus |
| CN104007368B (en) * | 2014-06-17 | 2017-01-18 | 漳州市锦成电力设备有限公司 | High-voltage electric wire fault detecting system and method based on CAN bus |
| CN104991163A (en) * | 2015-06-23 | 2015-10-21 | 国网甘肃省电力公司天水供电公司 | Single-phase phase-selection system |
| CN107255774A (en) * | 2017-06-16 | 2017-10-17 | 济南置真电气有限公司 | It is a kind of based on the selection method for falsely dropping line tripping combined floodgate information |
| CN107255774B (en) * | 2017-06-16 | 2020-01-14 | 济南置真电气有限公司 | Line selection method based on trip and closing information of mistakenly selected line |
| CN108508314A (en) * | 2018-02-24 | 2018-09-07 | 安徽合凯电气科技股份有限公司 | A kind of high-precision route selection tripgear |
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Granted publication date: 20130703 |