CN102981105B - Based on the Little Current Ground Connection System of CAN network - Google Patents

Based on the Little Current Ground Connection System of CAN network Download PDF

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CN102981105B
CN102981105B CN201210569093.0A CN201210569093A CN102981105B CN 102981105 B CN102981105 B CN 102981105B CN 201210569093 A CN201210569093 A CN 201210569093A CN 102981105 B CN102981105 B CN 102981105B
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zero
protection measure
computer integrated
integrated protection
route selection
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CN102981105A (en
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张杭
陈军
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NANJING INTELLIGENT APPARATUS CO Ltd
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NANJING INTELLIGENT APPARATUS CO Ltd
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Abstract

The present invention discloses a kind of Little Current Ground Connection System based on CAN network and disposal route thereof, system mainly comprises one and can calculate zero-sequenceprotection steady-state component, the computer integrated protection measure and control device analyzed, multiple stage computer integrated protection measure and control device is connected by CAN network, share and adopt the zero-sequenceprotection steady-state component calculated separately, when there is earth fault in circuit, all protective devices abnormality being detected, shared the stable state zero-sequence component data of self by CAN network simultaneously, and by route selection principle, find out most possible earth fault, tripping operation disconnects this earth fault, thus excise fault reliably.This Little Current Ground Connection System utilizes multiple stage protective device to judge the analysis of steady state data during earth fault, effectively prevents because the restriction of site environment and protecting single device route selection condition, causes the situation of large area malfunction or tripping.

Description

Based on the Little Current Ground Connection System of CAN network
Technical field
The present invention is a kind of Little Current Ground Connection System, belongs to relay protection field.
Background technology
The electric power system of China's power distribution network and large industrial enterprise mostly adopts isolated neutral or the method for operation through grounding through arc, and some urban distribution networks use the resistance eutral grounding method of operation instead in recent years.Mine 6 ~ 10kv electrical network adopts isolated neutral mode in the past always, and with the lengthening of underground power supply used circuit, capacitance current increases.Arc suppression coil obtains and applies and mainly adopt arc suppression coil and the earthing mode of crosstalk resistance in power system in mines in recent years.
In 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 raising power supply reliability, have important practical significance.
Current selection method, great majority are all separate unit protective relaying devices when there is earth fault, detect, analysis of failure time steady-state characteristic carry 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, leaking choosing, multiselect.
Summary of the invention
The invention provides a kind of Little Current Ground Connection System, to overcome the deficiency that current separate unit Small Electric Current Earthing And Routing Device judges.
This system can be detected by multiple stage, analyze the computer integrated protection of zero-sequence fault lower state forms; by the connection of CAN communication network; when earth fault occurs; all computer integrated protections send and share respective zero-sequence fault steady state measurement data in CAN network, and by being grounded a kind of intelligent system of route selection to the multilevel iudge of data.
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 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 are all integrated on master control borad; External analog amount input terminal is connected with master control borad by power panel; Display module is connected with master control borad by communication cable; Outside is opened and is connected with master control borad by display module into control knob; Infrared remote controller is connected 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 relay contained by it is made up of protection divide-shut brake relay, guard relay, alarm relay; Described power panel is made up of mutual inductor module and power module, and mutual inductor module is a kind of current-to-voltage converter module; Described display module is made up of into button, pilot lamp, LCD and infrared remote receiver active opening.
Above-mentioned computer integrated protection measure and control device, it is further characterised in that: power panel, by the power taking of PT three-phase, is supplied to master control borad power supply and exports DC110V and DC24V; It also has the communicating circuit part be integrated on master control borad, and by the communication interface of Phototube Coupling, all devices can be connected in a CAN.
Above-mentioned computer integrated protection measure and control device; it is further characterised in that: when line zero sequence voltage is abnormal, all detect all protective devices of residual voltage exception by CAN interface circuit steady-state component data upload relevant for now zero-sequenceprotection in CAN.
Above-mentioned computer integrated protection measure and control device; it is further characterised in that: when protective device send the relevant steady-state component of zero-sequenceprotection on CAN after; protective device in all CAN 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 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 amplitude comparison principle, first use " maximal value " principle from circuit, select three and the maximum circuit of above zero-sequence current value, and three and the maximum circuit of above quintuple harmonics zero-sequence current value.
Above-mentioned route selection principle, it is further characterized in that: route selection principle 2, utilize colony than facies principle, from the circuit selected, search zero-sequence current direction value with power orientation principle and quintuple harmonics zero-sequence current direction value is all positive circuit, thus select faulty line.
Above-mentioned route selection principle, it is further characterized in that: route selection principle 3, in order to prevent the protective device selected more than 1, for the zero-sequence current value maximum protection device selected, calculate the difference of maximum zero sequence current value and second largest zero-sequence current value again, if difference is greater than zero-sequence current and compares setting valve, then zero-sequenceprotection is by time delay outlet actuation time of adjusting; If difference is less than or equal to zero-sequence current and compares setting valve, then zero-sequenceprotection basis actuation time increases again 1S deferred action outlet adjusting.
Above-mentioned route selection principle; it is further characterized in that: route selection principle 4; if do not select the protective device meeting decision condition; first use " maximal value " principle from circuit, select three and the maximum circuit of above zero-sequence current; then from the circuit selected, searching zero-sequence current direction value with power orientation principle is positive circuit, thus selects faulty line.
Above-mentioned route selection principle, it is further characterized in that: route selection principle 5, exports according to the protective device that route selection principle 4 is selected according to route selection principle 3 action again.
beneficial effect of the present invention:
Computer integrated protection PA62 man-machine interface is friendly, provides full Chinese display interface and simple and direct visualized operation; Strong adaptability, has multi-protective function, is applicable to multiple primary equipment requirement; Can formation intelligent switchboard system supporting with Gao Bao switch cubicle producer, improve the technology content of switch cubicle itself, the competitive strength of enhancing 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.Fashionable appearance, volume is little, modular design, easy to maintenance, reduces costs.
When earth fault appears in circuit, all protective devices abnormality being detected, are shared the stable state zero-sequence component data of self simultaneously, and by route selection principle, find out most possible earth fault, excise fault reliably by CAN network.
This Little Current Ground Connection System utilizes multiple stage protective device to judge the analysis of steady state data during earth fault,
Effectively prevent because the restriction of site environment and protecting single device route selection condition, cause the situation of large area malfunction or tripping.
Accompanying drawing explanation
Fig. 1 ~ Fig. 5 is the structured flowchart of computer integrated protection in the present invention.
Fig. 6 is the wiring schematic diagram of the embodiment of the present invention.
Embodiment
Technical scheme of the present invention is described further by specific embodiment below in conjunction with accompanying drawing.
Computer integrated protection PA62 is primarily of parts compositions 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.
As shown in Figure 1, be the structured flowchart of computer integrated protection PA62 in the present invention or utility model.
Voltage and current signal after the conversion of electrical network primary equipment voltage, current transformer 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, then undertaken processing by DSP, computing obtains corresponding electric current and voltage value; Simultaneously DSP accepts to open into button signal through the pulse signal of Phototube Coupling and On-off signal signal (as circuit-breaker status), outside; All signals are after calculation process, and send corresponding breaker tripping and closing signal and alarm signal to driving interface circuit, these signals are delivered to each relay by driving circuit, and breaker tripping and closing relay contact connects the closing loop of contactor.The measured value of various signal, protection act value, fixed value adjusting are all shown by LCD.
The microcomputer protecting device be in same CAN network can be made to share respective zero-sequenceprotection steady-state component by the CAN communication interface of Phototube Coupling.
Set up this Little Current Ground Connection System, it needs multiple stage to detect, analyzes the computer integrated protection PA62 of zero-sequence fault lower state, is undertaken interconnected each other by CAN network.Its step is:
Step one: when normally working, protective device does not send data in CAN network;
Step 2: upon the occurrence of a ground fault, allly detects that respective zero-sequenceprotection steady-state component shared mutually by the protective device of abnormality;
Step 3: all protective devices obtain the zero-sequenceprotection steady-state component of other protective devices by CAN network, carries out analyzing, comparing according to route selection principle, judges actual most possible faulty line; Action exports, and eliminates fault.
In the invention, the design proposal of route selection principle comprises algorithm design, Software for Design and hardware design part.
1, algorithm design: in the invention, the core algorithm of route selection principle is that protective device is analyzed zero-sequenceprotection steady-state components all in CAN network, compared, judges.
(1) when normally working, PA62 device not uploading data in CAN;
(2) upon the occurrence of a ground fault, all zero-sequenceprotection steady-state components detecting that the PA62 device of residual voltage abnormal state detects self upload in CAN;
(3) PA62 device is according to route selection principle 1, utilizes colony amplitude comparison principle, selects the circuit that part may break down;
(4) PA62 device is according to route selection principle 2, utilizes colony than facies principle, again screens the circuit that may break down;
(5) 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 pass through the zero-sequenceprotection steady-state component data analysis shared, compare, and judge, finally select earth fault line, excise earth fault accurately and effectively.
2, Software for Design: in the invention, the process of route selection principle is divided on software: 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: upon the occurrence of a ground fault; 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 CAN network program: upon the occurrence of a ground fault; single protective device is fixed the steady-state component that the zero-sequenceprotection of calculating is correlated with data length with a frame; be sent in CAN network by CAN communication chip; and receive the zero-sequenceprotection steady-state component data of other devices simultaneously; according to the numbering of other devices; these data are stored in order in the register of self, for analyzing judgement.
Route selection determining program: single protective device is according to route selection principle, if self meet route selection principle, then judge to judge itself whether as earth fault, deferred action exports, excision earth fault.
3, hardware design: in the invention, the process of route selection principle comprises CAN transceiver, DSP.DSP is the nucleus module of route selection principle process, completes the reception to zero sequence steady-state component data, calculating and route selection etc.
Although the present invention is with preferred embodiment openly as above, they are not for limiting the present invention, anyly haveing the knack of this those skilled in the art, without departing from the spirit and scope of the invention, from when making various changes or retouch, but same within protection scope of the present invention.What therefore protection scope of the present invention should define with the claims of the application is as the criterion.

Claims (2)

1. the Little Current Ground Connection System based on CAN network, comprise and can detect, analyze the computer integrated protection measure and control device of zero-sequence fault lower state, described computer integrated protection measure and control device comprises master control borad, power panel, display module, Infrared remote controller, also comprise external analog amount input terminal, outside is opened into control knob, master control borad is integrated with outside intake input terminal, relay output end, CAN communication terminal, insulation resistance monitor input terminal, external analog amount input terminal is connected with master control borad by described power panel, display module is connected with described master control borad by communication cable, outside is opened and is connected with master control borad by described display module into control knob, Infrared remote controller is connected with master control borad by display module, described master control borad is by digital signal processor DSP, ferroelectric memory, sample circuit, relay forms, described relay is by protecting divide-shut brake relay, guard relay, alarm relay forms, 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 into button, pilot lamp, LCD and infrared remote receiver active opening, described power panel, by the power taking of mutual inductor module, is supplied to master control borad power supply and exports DC110V and DC24V, described computer integrated protection measure and control device also has the communicating circuit part be integrated on master control borad, by the communication interface of Phototube Coupling, arbitrary described computer integrated protection measure and control device can be connected in a CAN, be it is characterized in that: when line zero sequence voltage is abnormal, allly detect that all computer integrated protection measure and control devices of residual voltage exception upload in CAN by CAN interface circuit now zero-sequenceprotection steady-state component, when computer integrated protection measure and control device sends after on zero-sequenceprotection steady-state component to CAN, computer integrated protection measure and control device in all CAN receives the zero-sequenceprotection steady-state component that other computer integrated protection measure and control devices send simultaneously, the analysis of each computer integrated protection measure and control device contrasts all zero-sequenceprotection steady-state components, according to route selection principle, judge real zero-sequence fault point, the computer integrated protection measure and control device at this some place is after time delay, and tripping relay action exports, the zero-sequenceprotection steady-state component judged for route selection principle comprises zero-sequence current value, zero-sequence current direction value, quintuple harmonics zero-sequence current value and quintuple harmonics zero-sequence current direction value.
2. realize a route selection principle disposal route for Little Current Ground Connection System described in claim 1, it is characterized in that following steps:
Step one: when normally working, computer integrated protection measure and control device does not send data in CAN network;
Step 2: upon the occurrence of a ground fault, allly detects that the computer integrated protection measure and control device of abnormality shares respective zero-sequenceprotection steady-state component 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 CAN network, carries out analyzing, comparing according to route selection principle, judges real zero-sequence fault point; Action exports, and eliminates fault;
Route selection principle one, utilizes colony amplitude comparison principle, first uses " maximal value " principle from circuit, select three and the maximum circuit of above zero-sequence current value, and three and the maximum circuit of above quintuple harmonics zero-sequence current value;
Route selection principle two, utilizes colony than facies principle, searches zero-sequence current direction value and quintuple harmonics zero-sequence current direction value is all positive circuit with power orientation principle from the circuit selected, thus selects faulty line;
Route selection principle three, in order to prevent the computer integrated protection measure and control device selected more than 1, for the maximum computer integrated protection measure and control device of the zero-sequence current value selected, calculate the difference of maximum zero sequence current value and second largest zero-sequence current value again, if difference is greater than zero-sequence current and compares setting valve, then zero-sequenceprotection is by time delay outlet actuation time of adjusting; If difference is less than or equal to zero-sequence current and compares setting valve, then zero-sequenceprotection basis actuation time increases again 1S deferred action outlet adjusting;
Route selection principle four, if do not select the computer integrated protection measure and control device meeting decision condition, first use " maximal value " principle from circuit, select three and the maximum circuit of above zero-sequence current, then from the circuit selected, searching zero-sequence current direction value with power orientation principle is positive circuit, thus selects faulty line;
Route selection principle five, exports according to route selection principle three action according to the computer integrated protection measure and control device that route selection principle four is selected again.
CN201210569093.0A 2012-12-25 2012-12-25 Based on the Little Current Ground Connection System of CAN network Active CN102981105B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103245892B (en) * 2013-05-28 2015-11-18 安徽新在线科技股份有限公司 The earthing wire-selecting method of Small Electric Current Earthing And Routing Device
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
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

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101022216A (en) * 2007-02-07 2007-08-22 燕山大学 Small earthing current electric network single phase fault wire selecting method and apparatus
CN101359823A (en) * 2008-09-11 2009-02-04 樊国利 One-phase grounding hierarchical or integral wire-selective device for high-voltage grid
CN201226022Y (en) * 2008-07-04 2009-04-22 北京星火逐原科技有限公司 Route selection apparatus for low current grounding fault
CN201266827Y (en) * 2008-09-12 2009-07-01 南京因泰莱电器股份有限公司 Microcomputer comprehensive protector for mining
CN101701998A (en) * 2009-11-19 2010-05-05 山东泰开自动化有限公司 Novel faulty line selection method in low current faulty grounding system
CN201478809U (en) * 2009-07-23 2010-05-19 江苏省电力公司常州供电公司 Single-phase grounding line selection device for 20 kV power grid
CN101777757A (en) * 2009-01-12 2010-07-14 杭州德力西集团有限公司 Small current grounding route selection method
CN102110978A (en) * 2011-01-20 2011-06-29 单立辉 Method and device for high-accuracy low-current intelligent grounding wire selection
CN202281817U (en) * 2011-10-31 2012-06-20 杭州博瑞电气有限公司 Microcomputer low current grounding and line-selecting system
CN203037795U (en) * 2012-12-25 2013-07-03 南京因泰莱电器股份有限公司 Small current grounding line selection system based on CAN network

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001041995A (en) * 1999-07-28 2001-02-16 Kansai Electric Power Co Inc:The Ground fault locator and locating method

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101022216A (en) * 2007-02-07 2007-08-22 燕山大学 Small earthing current electric network single phase fault wire selecting method and apparatus
CN201226022Y (en) * 2008-07-04 2009-04-22 北京星火逐原科技有限公司 Route selection apparatus for low current grounding fault
CN101359823A (en) * 2008-09-11 2009-02-04 樊国利 One-phase grounding hierarchical or integral wire-selective device for high-voltage grid
CN201266827Y (en) * 2008-09-12 2009-07-01 南京因泰莱电器股份有限公司 Microcomputer comprehensive protector for mining
CN101777757A (en) * 2009-01-12 2010-07-14 杭州德力西集团有限公司 Small current grounding route selection method
CN201478809U (en) * 2009-07-23 2010-05-19 江苏省电力公司常州供电公司 Single-phase grounding line selection device for 20 kV power grid
CN101701998A (en) * 2009-11-19 2010-05-05 山东泰开自动化有限公司 Novel faulty line selection method in low current faulty grounding system
CN102110978A (en) * 2011-01-20 2011-06-29 单立辉 Method and device for high-accuracy low-current intelligent grounding wire selection
CN202281817U (en) * 2011-10-31 2012-06-20 杭州博瑞电气有限公司 Microcomputer low current grounding and line-selecting system
CN203037795U (en) * 2012-12-25 2013-07-03 南京因泰莱电器股份有限公司 Small current grounding line selection system based on CAN network

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
基于暂态特征信号综合判据的小电流接地选线装置的研制;揭林玲等;《2008中国电力系统保护与控制学术研讨会论文集》;20081231;75-78 *
网络化微机保护设计;李卫国;《万方学位论文》;20071112;第5-10,33-54页 *

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