CN1901313A - Method for selective leakage protection of electric feeding switch protector - Google Patents
Method for selective leakage protection of electric feeding switch protector Download PDFInfo
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- CN1901313A CN1901313A CN 200610041081 CN200610041081A CN1901313A CN 1901313 A CN1901313 A CN 1901313A CN 200610041081 CN200610041081 CN 200610041081 CN 200610041081 A CN200610041081 A CN 200610041081A CN 1901313 A CN1901313 A CN 1901313A
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- feeding switch
- protective device
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Abstract
This invention relates to a selective leakage protection method for feed switch protection devices characterizing in utilizing CAN bus to communicate and endue the CAN bus ID of different priorities based on the level of the feed switch protection device places including setting the ID priority of the main feed switch protection device the lowest and the ID priorities of the branch devices higher in file, when leakage happens to the load side of any branch device, the branch and the main feed protection devices test it at the same time, the branch wins the bus arbitration in terms of its ID and transmits the information, the main and the branch feed switch protection devices without errors keep normal.
Description
Technical field:
The present invention relates to a kind of method that is applied in selective earth leakage protection in the 380～1140V electrical network of colliery.
Background technology:
Coal production is mainly carried out in the down-hole, and major part is a cable power supply, and environment is abominable, and fault is many, and single-phase electric leakage or single phase ground fault often take place cable line.Perfect selective earth leakage protection is set, takes practicable earth leakage protective measure, can dwindle the power failure scope, improve the fail safe and the reliability of coal production greatly.Low-voltage power supply system under the coal mine as shown in drawings.Wherein, the M1 place is total feeding switch, and S2, S3 and S4 place are branch's feeding switch, and T is a step-down transformer.
In system shown in the accompanying drawing, the earth leakage protective device branch is located at total feeding switch and branch's feeding switch two places, that is adopts two-stage selective earth leakage protection system.For guaranteeing its selectivity, existingly between the two-stage earth leakage protective device, generally can only realize the selectivity of moving by time-delay, should promptly follow differential principle of time limit the operate time of higher level's earth leakage protective device than long stage in time limit of next stage; Laterally selectivity then adopts zero-sequence current directional power protection principle to realize, the earth leakage protective device at total feeding switch protective device place adopts the protection philosophy of additional dc power supply.Differential 200～the 500ms that is about of operation time limit between the upper and lower two-stage selective leakage protection device.
Selective earth leakage protection malfunction in the use of China's underground low-tension network at present, tripping phenomenon happen occasionally, and have a strong impact on the safety in production of coal.Have time-delay because higher level's selective leakage protection device moves simultaneously, make the operate time long (when leaking electricity as circuit 1) near the selective leakage protection device of power supply, the danger that the person gets an electric shock in this protection range is just bigger.Thereby the selectivity of earth leakage protective device action and the contradiction between the personal fail safe of getting an electric shock have occurred, sacrificed certain fail safe in other words and just brought selectivity.
Summary of the invention:
The present invention is for avoiding above-mentioned existing in prior technology weak point, providing a kind of CAN bus of utilizing quick, stepless difference to realize the method for selective leakage protection of electric feeding switch protector.
The technical scheme that technical solution problem of the present invention is adopted is:
The characteristics of the inventive method are to utilize the CAN bus to carry out communication; give the identifier of the different priority of CAN bus according to the residing level of feeding switch protective device; comprise: the identifier priority that total feeding switch protective device (M1) is set is minimum; each feeding switch protective device (S2 of branch; S3 and S4) the identifier priority higher successively; during arbitrary branch feeding switch protective device load-side generation leak current fault; branch's feeding switch protective device and total feeding switch protective device detect this fault simultaneously; this branch's feeding switch protective device wins bus arbitration according to the priority of its identifier; and information sent; host computer writes down this warning message, and total feeding switch protective device and the branch's feeding switch protective device that does not break down keep operate as normal.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention and external communication adopt CAN field bus control system mode, and the CAN bus is the many main machine structures bus with peak transfer rate 1 megabit per second.Node on the CAN bus is broadcasted data in network, any node that message is interested in can both receive these data, and knows that this information is to send wherefrom.The CAN agreement provides the method for multiple error detection and correction, if message destroyed it can detect and also network in all nodes can ignore this message, till this message can be sent to always and accurately be received, so the CAN bus still can be transmitted data exactly in the very big environment of electrical noise.Compare with traditional RS485 communication modes, the CAN bus mode is except obtaining higher communication speed and reliability, more advanced part is that the CAN bus protocol supports the bus arbitration of many main frames, that is to say, when bus is idle, any unit can begin to transmit message, and the unit with higher-priority message can obtain bus access power.If there are two or more unit to begin to transmit message simultaneously, then can solve this bus access conflict by the position form arbitration of using identifier, the higher node of identifier priority can win bus control right.The mechanism of arbitration guarantees that information and time all can not lose.
2, physical connection aspect, CAN bus and RS485 use the band Shielded Twisted Pair equally, and cabling requirement does not improve.If before had the RS485 network, then can directly utilize basically and need not other wiring.
Description of drawings:
Accompanying drawing is underground low voltage power system figure.
Among the figure: M1 is total feeding switch protective device, and S2 is that circuit 2 branch's feeding switch protective devices, S3 are that circuit 3 branch's feeding switch protective devices, S4 are circuit 4 branch's feeding switch protective devices.
Below by embodiment the present invention is further described:
Embodiment:
Present embodiment is to utilize the CAN bus to carry out communication; give the identifier of the different priority of CAN bus according to the residing level of feeding switch protective device; for low-voltage power supply system; the identifier priority that total feeding switch protective device M1 is set is minimum; the identifier priority order of each the feeding switch protective device S2 of circuit top set, S3 and S4 is higher, i.e. P
S2＞P
S3＞P
S4＞P
M1Earth leakage protecting method is: during arbitrary branch feeding switch protective device load-side generation leak current fault; branch's feeding switch protective device and total feeding switch protective device detect this fault simultaneously; this branch's feeding switch protective device wins bus arbitration according to the priority of its identifier; and information sent; host computer writes down this warning message, and total feeding switch protective device and the branch's feeding switch protective device that does not break down keep operate as normal.
As follows for the concrete protected mode of circuit shown in the drawings:
A, arbitrary branch feeding switch protective device load-side generation leak current fault, with circuit 4 is example, the feeding switch protective device S4 of branch and total feeding switch protective device M1 detect this fault simultaneously, and the feeding switch protective device S4 of branch protects separating brake immediately, and faulty line is cut off; The feeding switch protective device S4 of branch and total feeding switch protective device M1 all attempt sending electric leakage information to the CAN bus; after the higher feeding switch protective device S4 of branch of identifier priority wins bus arbitration information is sent; total feeding switch protective device M1 detects the leak current fault eliminating and recovers normal condition and cancel the trial that sends leak current fault information behind this branch's feeding switch protective device separating brake, host computer writes down the warning message of the feeding switch protective device S4 of branch.
Leak current fault takes place in a plurality of load-side simultaneously in b, each branch's feeding switch protective device; with circuit 2 and circuit 4 places is example; the feeding switch protective device S2 of branch, S4 and total feeding switch protective device M1 detect this fault simultaneously; feeding switch protective device S2 of branch and S4 protect separating brake immediately, and faulty line is cut off.The feeding switch protective device S2 of branch; S4 and total feeding switch protective device M1 all attempt sending electric leakage information to the CAN bus; after the feeding switch protective device S2 of branch that the identifier priority is the highest wins bus arbitration information is sent; the higher feeding switch protective device S4 of branch of identifier priority still attempts sending fault message after losing bus arbitration; S4 successfully sends information after treating the CAN bus recovery free time; total feeding switch protective device M1 detects the leak current fault eliminating and recovers normal condition and cancel the trial that sends leak current fault information behind feeding switch protective device S2 of branch and S4 separating brake, host computer has write down the warning message of S2 and S4 successively.
Circuit generation leak current fault between c, hypothesis branch feeding switch protective device and the total feeding switch protective device; it in this figure circuit 1 place; only there is total feeding switch protective device M1 to detect this fault; total feeding switch protective device M1 attempts successfully sending after the CAN bus sends electric leakage information; total feeding switch protective device M1 protection separating brake, electric leakage circuit 1 and circuit are afterwards all cut off from main line.Host computer can record the warning message of total feeding switch protective device M1.
D; suppose that leak current fault takes place certain moment many places circuit simultaneously; with circuit 1; 2 and 4 places are example; the feeding switch protective device S2 of branch; S4 and total feeding switch protective device M1 detect this fault simultaneously; feeding switch protective device S2 of branch and S4 protect separating brake immediately; the feeding switch protective device S2 of branch; S4 and total feeding switch protective device M1 all attempt sending electric leakage information to the CAN bus; after the feeding switch protective device S2 of branch that the identifier priority is the highest wins bus arbitration information is sent; the higher feeding switch protective device S4 of branch of identifier priority still attempts sending fault message after losing bus arbitration; S4 successfully sends information after treating the CAN bus recovery free time; total feeding switch protective device M1 still detects leak current fault behind feeding switch protective device S2 of branch and S4 separating brake; total feeding switch protective device M1 attempts successfully sending after the CAN bus sends electric leakage information; total feeding switch protective device M1 protection separating brake, electric leakage circuit 1 and circuit are afterwards all cut off from main line.Host computer can record the warning message of S2, S4 and M1 successively.
E, if circuit generation leak current fault, and branch's feeding switch tripping, then total feeding switch device does not have in the preset time of having delayed time (200ms) back selectively protects separating brake.
More than the protection process of several electric leakage situations be equally applicable to install on the same branch road situation of the feeder protection equipment of greater number.
Claims (1)
1; the method of selective leakage protection of electric feeding switch protector; it is characterized in that utilizing the CAN bus to carry out communication; give the identifier of the different priority of CAN bus according to the residing level of feeding switch protective device; comprise: the identifier priority that total feeding switch protective device (M1) is set is minimum; each feeding switch protective device (S2 of branch; S3 and S4) the identifier priority higher successively; during arbitrary branch feeding switch protective device load-side generation leak current fault; branch's feeding switch protective device and total feeding switch protective device detect this fault simultaneously; this branch's feeding switch protective device wins bus arbitration according to the priority of its identifier; and information sent; host computer writes down this warning message, and total feeding switch protective device and the branch's feeding switch protective device that does not break down keep operate as normal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100410815A CN100499308C (en) | 2006-07-21 | 2006-07-21 | Method for selective leakage protection of electric feeding switch protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100410815A CN100499308C (en) | 2006-07-21 | 2006-07-21 | Method for selective leakage protection of electric feeding switch protector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1901313A true CN1901313A (en) | 2007-01-24 |
| CN100499308C CN100499308C (en) | 2009-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100410815A Expired - Fee Related CN100499308C (en) | 2006-07-21 | 2006-07-21 | Method for selective leakage protection of electric feeding switch protector |
Country Status (1)
| Country | Link |
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| CN (1) | CN100499308C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834464A (en) * | 2010-05-11 | 2010-09-15 | 梅勒电气(武汉)有限公司 | Charging pile for electric vehicle |
| CN101860007A (en) * | 2010-04-20 | 2010-10-13 | 山东卓尔电气有限公司 | Remote intelligent residual current monitoring and protection system |
| CN101582581B (en) * | 2008-08-14 | 2012-05-02 | 韩俊 | Electricity leakage-prevention and overcurrent protection device |
-
2006
- 2006-07-21 CN CNB2006100410815A patent/CN100499308C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582581B (en) * | 2008-08-14 | 2012-05-02 | 韩俊 | Electricity leakage-prevention and overcurrent protection device |
| CN101860007A (en) * | 2010-04-20 | 2010-10-13 | 山东卓尔电气有限公司 | Remote intelligent residual current monitoring and protection system |
| CN101860007B (en) * | 2010-04-20 | 2012-08-15 | 山东卓尔电气有限公司 | Remote intelligent residual current monitoring and protection system |
| CN101834464A (en) * | 2010-05-11 | 2010-09-15 | 梅勒电气(武汉)有限公司 | Charging pile for electric vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100499308C (en) | 2009-06-10 |
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Granted publication date: 20090610 Termination date: 20180721 |