CN103078301A - Override trip protection system and method for coal mine power network - Google Patents
Override trip protection system and method for coal mine power network Download PDFInfo
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- CN103078301A CN103078301A CN2012100364047A CN201210036404A CN103078301A CN 103078301 A CN103078301 A CN 103078301A CN 2012100364047 A CN2012100364047 A CN 2012100364047A CN 201210036404 A CN201210036404 A CN 201210036404A CN 103078301 A CN103078301 A CN 103078301A
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Abstract
The invention discloses an override trip protection system and method for a coal mine power network. The override trip protection system comprise a ground power substation, a center power substation, a mining area power substation and switches, and is characterized in that a first switch and a second switch are cascaded between the ground power substation and the center power substation, a third switch and a fourth switch are cascaded between the center power substation and the mining area power substation, and the switches are respectively connected with a longitudinal differential protector.
Description
Technical field
The present invention relates to a kind of safety protection equipment for Coal Mine Power Network, relate in particular to a kind of overstep tripping protection system and method for Coal Mine Power Network.
Background technology
Syllogic current protection principle is adopted in relaying protection usually in the electric power system, and the syllogic current protection generally consists of a whole set of protection by cooperatively interacting without time limit current quick (I section), band time limit current quick (II section) and specified time overcurrent protection (III section).Wherein I, II section are united the main protection as circuit, and the III section is as the nearly reserve of this circuit and the backup protection far away of adjacent lines.
Theoretical by the syllogic protection, fast tripping protection only can be protected 80% of total track length, protects in support below the switch that can protect electric substation of subordinate with the overcurrent protection of time delay.And Coal Mine Power Network all is short-term road, doorway short circuit and line end short circuit.The short circuit current that switch is experienced is basically the same, causes electric substation of the superior and the subordinate short-circuit protection to cooperate, and so just causes the line short when electric substation of subordinate, and the superior and the subordinate's short-circuit protection all starts, and causes the generation of overstep tripping.For this situation, the way of urban power distribution network is that the fast tripping protection of first order switch does not drop into, and adopts overcurrent protection to carry out the cooperation of the superior and the subordinate's overcurrent protection by delay time.And Coal Mine Power Network, its transformer station is divided into integrated power system transformer station and Coal Mine Power Network transformer station usually, wherein 35KV transformer station or 110KV transformer station are the integrated power system transformer stations by electric company's unified management, and only have subordinate and lower-level 6kv electric substation just to belong to Coal Mine Power Network transformer station.Therefore, when situation that Coal Mine Power Network is short-circuited, can't realize that fast tripping protection withdraws from.In the prior art; in the transformer substation system of ground, adopt overcurrent protection can realize the protection of ground electrical network by the differential way that cooperates of time; but because distance is usually shorter between Coal Mine Power Network higher level and the subordinate, rely on conventional differential fitting method of time obviously not easy to identify.This also is one of reason that causes the Coal Mine Power Network overstep tripping.
Can't realize cooperating the overstep tripping that causes except above-mentioned because of fast tripping protection and overcurrent protection; also can reduce the no-voltage trip that causes because of voltage fluctuation and doorway short-circuit voltage; cause the large-area power-cuts problem, perhaps cause ground, down-hole high pressure switch malfunction problem because of the high pressure electric leakage.In case the large-area power-cuts problem occurs under the coal mine, very easily bring out the downhole safety accident, cause casualties and device damage.
Therefore prior art is badly in need of a kind of safe and reliable overstep tripping protection system that is used for Coal Mine Power Network.
Summary of the invention
For overcoming the shortcoming that exists in the prior art, the invention provides a kind of overstep tripping protection system and method for Coal Mine Power Network, solved the generation that fast tripping protection and overcurrent protection can't cooperate the overstep tripping that causes.
In order to realize the foregoing invention purpose; the present invention discloses a kind of overstep tripping protection system for Coal Mine Power Network; comprise ground transformer substation, central substation, working section sub station and switch; it is characterized in that; cascade the first switch and second switch between this ground transformer substation and this central substation; cascade the 3rd switch and the 4th switch between this central substation and the working section sub station, this switch connects respectively a longitudinal difference protection device.
Further, also comprise a differential protection connection between this first switch and the second switch, also comprise a differential protection connection between the 3rd switch and the 4th switch.
Further, this differential protection connection looped network connects or point to point connect.
Further, this differential protection connection is communication cable or optical cable.
Further, this looped network is the optical fiber ring network system, and this optical fiber ring network system also comprises optic fiber converter.
Further, this switch is high-voltage switch gear.
Further, this longitudinal difference protection device is arranged at this switch inside.
Further, this longitudinal difference protection device is a full digital comprehensive protection device.
Further, the protection of this switch includes fast tripping protection and with the overcurrent protection in time limit.
The present invention discloses a kind of method of the overstep tripping protection for Coal Mine Power Network simultaneously; comprise: cascade the first switch and second switch between ground transformer substation and central substation; cascade the 3rd switch and the 4th switch between central substation and working section sub station, this switch connects a longitudinal difference protection device respectively.
Compared with prior art, the invention provides a kind of overstep tripping protection system and method for Coal Mine Power Network, solved the generation that fast tripping protection and overcurrent protection can't cooperate the overstep tripping that causes.Can realize Real Time Monitoring and in time processing for short trouble.Overstep tripping protection system for Coal Mine Power Network provided by the invention can access original mining electrical network at once simultaneously, the seamless access of realization and original grid monitoring system, the vertical difference of the cascade net of formation full electric network.
Description of drawings
Can be by following detailed Description Of The Invention and appended graphic being further understood about the advantages and spirit of the present invention.
Fig. 1 is the schematic diagram of overstep tripping protection system involved in the present invention;
Fig. 2 is the structural representation of overstep tripping protection system involved in the present invention;
Fig. 3 is the longitudinal difference protection anastomose composition of the redundancy of overstep tripping protection system involved in the present invention.
Embodiment
Describe specific embodiments of the invention in detail below in conjunction with accompanying drawing.
Fig. 1 is cascade Differential Current Protection Principle figure.
As shown in Figure 1,5DL, 6DL, 7DL, 8DL are cascaded switch, and main protection is 0 second cascade longitudinal difference protection, and backup protection is the overcurrent protection with the time limit, and overcurrent protection delay time definite value can be set as respectively: 5DL-0.5S; 6DL, 7DL-0.35S; 8DL-0.2S.All the other load-carrying switch main protections are 0 second short-circuit protection and with the overload protection in time limit.
When cascade line fault: during cascade line short between 7DL, the 8DL, 5DL, 6DL, 7DL have all experienced short circuit current, and rest switch flows through without short circuit current; Spill current between 5DL, the 6DL is 0, and the cascade longitudinal difference protection is failure to actuate; Spill current between 7DL, the 8DL is short circuit current, 7DL, L8D action in equal 0 second, the cascade circuit of isolation short circuit.
When the outlet fault: during the 1S short circuit, 5DL, 6DL, 7DL, 8DL, 1S have all experienced short circuit current, between 5DL, the 6DL and the spill current between 7DL, the L8DL be 0, longitudinal difference protection all is failure to actuate.The short-circuit protection action in 0 second of 1S, the excision fault; The 1S short circuit, during switch failure, its higher level's switch 8DL reserve overcurrent protection action, excision fault.
When busbar fault: 5DL, 6DL, 7DL, 8DL all experience short circuit current, and spill current is 0, and longitudinal difference protection is failure to actuate; By the time after the 8DL overcurrent delay time arrives, the overcurrent protection of 8DL action, excision fault bus.
The overcurrent protection delay time definite value of 5DL, 6DL, 7DL, 8DL can be set as respectively: 5DL-0.5S; 6DL, 7DL-0.35S; 8DL-0.2S.
Fig. 2 is the structural representation of overstep tripping protection system involved in the present invention.In the present embodiment, the Project Realization of cascade longitudinal difference protection is as follows:
1+, the 1-main protection is selected differential, and matches; 2+, the 2-main protection is selected differential, and matches; 3+, the 3-main protection is selected differential, and matches; 4+, the 4-main protection is selected differential, and matches; 5+, the 5-main protection is selected differential, and matches; 6+, the 6-main protection is selected differential, and matches; Their backup protection all is the overcurrent protection with the time limit.As: 1+, the time limit of 2+ is 0.5S; 1-, 2-, 3+, 4+, 5+, 6+ the time be limited to 0.35S, 3-, 4-, 5-, 6-the time be limited to 0.2S.All outlets all are quick-break in 0 second.
Point-to-point optical differential and cable are differential: with optical cable or communication cable the switch at cascade circuit two ends is linked up, just can consist of the longitudinal difference protection passage.
Two fibre cores for subsequent use of the built cable system of the present embodiment utilization, the longitudinal difference protection net of a redundancy of formation, as shown in Figure 3:
The differential high speed communication mouth of the interconnection comprehensive protection device of each electric substation connects together, and converts two core fibres to by optic fiber converter 302, in the access looped network cable system.In this embodiment, the looped network cable system is an optical fiber ethernet ring network 3, takies two fibre cores of cable system, and this looped network cable system connects by ring exchanger 301 each other, has ensured the unimpeded of information.
The differential connection of the interconnection of each electric substation protection connects together, and consists of a high speed communication bus 201, by optic fiber converter 302 signal of telecommunication is converted to light signal again, and the access optical cable system is connected on the bus of another electric substation.Consisted of like this high speed communication bus system of a full electric network.This high speed communication bus system has consisted of redundant network too, to improve the communication reliability.
Described in this specification is preferred embodiment of the present invention, and above embodiment is only in order to illustrate technical scheme of the present invention but not limitation of the present invention.All those skilled in the art all should be within the scope of the present invention under this invention's idea by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. overstep tripping protection system that is used for Coal Mine Power Network; comprise ground transformer substation, central substation, working section sub station and switch; it is characterized in that; cascade the first switch and second switch between described ground transformer substation and the described central substation; cascade the 3rd switch and the 4th switch between described central substation and the working section sub station, described switch connects respectively a longitudinal difference protection device.
2. overstep tripping protection system for Coal Mine Power Network as claimed in claim 1; it is characterized in that; also comprise a differential protection connection between described the first switch and the second switch, also comprise a differential protection connection between described the 3rd switch and the 4th switch.
3. the overstep tripping protection system for Coal Mine Power Network as claimed in claim 2 is characterized in that, described differential protection connection looped network connects or point to point connect.
4. the overstep tripping protection system for Coal Mine Power Network as claimed in claim 2 is characterized in that, described differential protection connection is communication cable or optical cable.
5. the overstep tripping protection system for Coal Mine Power Network as claimed in claim 3 is characterized in that, described looped network is the optical fiber ring network system, and described optical fiber ring network system also comprises optic fiber converter.
6. the overstep tripping protection system for Coal Mine Power Network as claimed in claim 1 is characterized in that, described switch is high-voltage switch gear.
7. the overstep tripping protection system for Coal Mine Power Network as claimed in claim 1 is characterized in that, it is inner that described longitudinal difference protection device is arranged at described switch.
8. the overstep tripping protection system for Coal Mine Power Network as claimed in claim 7 is characterized in that, described longitudinal difference protection device is a full digital comprehensive protection device.
9. the overstep tripping protection system for Coal Mine Power Network as claimed in claim 1 is characterized in that, the protection of described switch includes fast tripping protection and with the overcurrent protection in time limit.
10. method that is used for the overstep tripping protection of Coal Mine Power Network; comprise: cascade the first switch and second switch between ground transformer substation and central substation; cascade the 3rd switch and the 4th switch between central substation and working section sub station, described switch connects a longitudinal difference protection device respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100364047A CN103078301A (en) | 2011-10-25 | 2012-02-13 | Override trip protection system and method for coal mine power network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110328096.0 | 2011-10-25 | ||
| CN201110328096 | 2011-10-25 | ||
| CN2012100364047A CN103078301A (en) | 2011-10-25 | 2012-02-13 | Override trip protection system and method for coal mine power network |
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| CN103078301A true CN103078301A (en) | 2013-05-01 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543725A (en) * | 2013-10-24 | 2014-01-29 | 河南理工大学 | Underground override trip preventing system based on EtherCAT and 485 communication |
| CN103730885A (en) * | 2014-01-24 | 2014-04-16 | 兖州东方机电有限公司 | Power distribution device, protective system, mining power monitoring system and protection method |
| CN104716637A (en) * | 2015-04-01 | 2015-06-17 | 哈尔滨国力电气有限公司 | Method for preventing override trip of coal mine power supply system |
| CN105490257A (en) * | 2015-12-30 | 2016-04-13 | 神华集团有限责任公司 | Underground safe power supply protection system |
| CN105914721A (en) * | 2016-06-08 | 2016-08-31 | 南京弘毅电气自动化有限公司 | Override trip prevention system used for multi-power-supply distribution network and protection method thereof |
| CN114971938A (en) * | 2022-06-07 | 2022-08-30 | 上海山源电子科技股份有限公司 | Method and device for detecting override-proof network topology of coal mine power supply system and storage medium |
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| JPH0426320A (en) * | 1990-05-16 | 1992-01-29 | Mitsubishi Electric Corp | High voltage distribution loop protective unit |
| CN201332264Y (en) * | 2009-01-05 | 2009-10-21 | 河南理工大学 | Chain safeguard intelligent control device for coal mine downhole power supply system |
| CN202455054U (en) * | 2011-10-25 | 2012-09-26 | 上海山源电子电气科技发展有限公司 | Override trip protection system for coal mine power grid |
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| JPH0426320A (en) * | 1990-05-16 | 1992-01-29 | Mitsubishi Electric Corp | High voltage distribution loop protective unit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543725A (en) * | 2013-10-24 | 2014-01-29 | 河南理工大学 | Underground override trip preventing system based on EtherCAT and 485 communication |
| CN103543725B (en) * | 2013-10-24 | 2016-01-13 | 河南理工大学 | A kind of down-hole anti-overstep tripping system based on EtherCAT and 485 communications |
| CN103730885A (en) * | 2014-01-24 | 2014-04-16 | 兖州东方机电有限公司 | Power distribution device, protective system, mining power monitoring system and protection method |
| CN104716637A (en) * | 2015-04-01 | 2015-06-17 | 哈尔滨国力电气有限公司 | Method for preventing override trip of coal mine power supply system |
| CN104716637B (en) * | 2015-04-01 | 2017-09-29 | 哈尔滨国力电气有限公司 | It is a kind of to prevent that Coal Mine Power Distribution System from bypassing the immediate leadership the method for tripping operation |
| CN105490257A (en) * | 2015-12-30 | 2016-04-13 | 神华集团有限责任公司 | Underground safe power supply protection system |
| CN105914721A (en) * | 2016-06-08 | 2016-08-31 | 南京弘毅电气自动化有限公司 | Override trip prevention system used for multi-power-supply distribution network and protection method thereof |
| CN105914721B (en) * | 2016-06-08 | 2019-05-24 | 南京弘毅电气自动化有限公司 | A kind of anti-overstep tripping system and its guard method for more electrical power distribution networks |
| CN114971938A (en) * | 2022-06-07 | 2022-08-30 | 上海山源电子科技股份有限公司 | Method and device for detecting override-proof network topology of coal mine power supply system and storage medium |
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Application publication date: 20130501 |