CN202455054U - Override trip protection system for coal mine power grid - Google Patents
Override trip protection system for coal mine power grid Download PDFInfo
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- CN202455054U CN202455054U CN2012200509592U CN201220050959U CN202455054U CN 202455054 U CN202455054 U CN 202455054U CN 2012200509592 U CN2012200509592 U CN 2012200509592U CN 201220050959 U CN201220050959 U CN 201220050959U CN 202455054 U CN202455054 U CN 202455054U
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Abstract
The utility model discloses an override trip protection system for a coal mine power grid. The override trip protection system comprises a ground substation, a central substation, a mining area substation and switches and is characterized in that a first switch and a second switch are cascaded between the ground substation and the central substation; a third switch and a fourth switch are cascaded between the central substation and the mining substation; and the switches are respectively connected with a longitudinal difference protector.
Description
Technical field
The utility model relates to a kind of safety protection equipment that is used for the colliery electrical network, relates in particular to a kind of overstep tripping protection system that is used for the colliery electrical network.
Background technology
Syllogic current protection principle is adopted in relaying protection usually in the electric power system, and the syllogic current protection is generally cooperatively interacted by no time limit current quick (I section), band time limit current quick (II section) and specified time overcurrent protection (III section) and constitutes a whole set of protection.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, and the overcurrent protection of band time delay is protected below the switch that can protect electric substation of subordinate in support.And the colliery electrical network all is a short-term road, doorway short circuit and line end short circuit.The short circuit current that switch is experienced is the same basically, 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 through delay time.And the colliery electrical network; Its transformer station is divided into integrated power system transformer station and colliery electricity grid substation usually; Wherein 35KV transformer station or 110KV transformer station are the integrated power system transformer stations by electric company's unified management, and have only subordinate and lower-level 6kv electric substation just to belong to the colliery electricity grid substation.Therefore, when situation that the colliery electrical network is short-circuited, can't realize that fast tripping protection withdraws from.In the prior art; In ground power transformation system, adopt overcurrent protection to lean on the differential way that cooperates of time can realize the protection of ground electrical network; But, rely on conventional differential fitting method of time obviously to be difficult for identification because distance is shorter usually between colliery electrical network higher level and the subordinate.This also is one of reason that causes colliery electrical 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 takes place 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 the colliery electrical network.
The utility model content
For overcoming the shortcoming that exists in the prior art, the utility model provides a kind of overstep tripping protection system that is used for the colliery electrical network, has solved the generation that fast tripping protection and overcurrent protection can't cooperate the overstep tripping that causes.
In order to realize above-mentioned utility model purpose; The utility model discloses a kind of overstep tripping protection system that is used for the colliery electrical network; Comprise ground electric substation, central substation, working section sub station and switch, it is characterized in that, cascade first switch and second switch between this ground electric 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 a longitudinal difference protection device respectively.
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 connection.
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 a high-voltage switch gear.
Further, it is inner that this longitudinal difference protection device is arranged at this switch.
Further, this longitudinal difference protection device is a full digital comprehensive protection device.
Further, the protection of this switch includes the overcurrent protection in fast tripping protection and band time limit.
The utility model discloses a kind of method that is used for the overstep tripping protection of colliery electrical network simultaneously; Comprise: cascade first switch and second switch between ground electric 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 utility model provides a kind of overstep tripping protection system and method that is used for the colliery electrical network, has solved the generation that fast tripping protection and overcurrent protection can't cooperate the overstep tripping that causes.Can realize monitoring in real time and in time handle to short trouble.The overstep tripping protection system that is used for the colliery electrical network that while the utility model provides can insert original mining electrical network at once, realizes and the seamless access of original grid monitoring system that the difference net is indulged in the cascade that constitutes full electric network.
Description of drawings
Can detail and appendedly graphicly further understood through following utility model about the advantage of the utility model and spirit.
Fig. 1 is the schematic diagram of the related overstep tripping protection system of the utility model;
Fig. 2 is the structural representation of the related overstep tripping protection system of the utility model;
Fig. 3 is the longitudinal difference protection anastomose composition of the redundancy of the related overstep tripping protection system of the utility model.
Embodiment
Specify the specific embodiment of the utility model 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 in band time limit, and overcurrent protection delay time definite value can be set at 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 are 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 does not have short circuit current and flows through; 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 a short circuit current, 7DL, L8D action in equal 0 second, the cascade circuit of isolating 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 the 7DL, 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 the switch tripping, its higher level's switch 8DL reserve overcurrent protection action, excision fault.
When busbar fault: 5DL, 6DL, 7DL, 8DL, 1S all experience short circuit current, and spill current is 0, and longitudinal difference protection is failure to actuate; By the time after 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 at respectively: 5DL-0.5S; 6DL, 7DL-0.35S; 8DL-0.2S.
Fig. 2 is the structural representation of the related overstep tripping protection system of the utility model.In this execution mode, the Project Realization of cascade longitudinal difference protection is following:
1+, the 1-main protection is selected differential, and matches; 2+, it is poor that the 2-main protection is selected, and match; 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 in band 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: link up the switch at cascade circuit two ends with optical cable or communication cable, just can constitute the longitudinal difference protection passage.
Two subsequent use fibre cores of cable system have been built up in the present embodiment utilization, constitute the longitudinal difference protection net of a redundancy, and are 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 through optic fiber converter 302, inserts in the 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 through ring exchanger 301 each other, has ensured the unimpeded of information.
The differential connection of the interconnection protection of each electric substation connects together, and constitutes a high speed communication bus 201, is light signal by optic fiber converter 302 with electrical signal conversion again, inserts cable system, is connected on the bus of another electric substation.Constituted the high speed communication bus system of a full electric network like this.This high speed communication bus system has constituted redundant network too, to improve the communication reliability.
The preferred embodiment of the just the utility model described in this specification, above embodiment is only in order to the technical scheme of explanation the utility model but not to the restriction of the utility model.All those skilled in the art according to the design of the utility model through the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be within the scope of the utility model.
Claims (9)
1. overstep tripping protection system that is used for the colliery electrical network; Comprise ground electric substation, central substation, working section sub station and switch; It is characterized in that; Cascade first switch and second switch between said ground electric substation and the said central substation, cascade the 3rd switch and the 4th switch between said central substation and the working section sub station, said switch connects a longitudinal difference protection device respectively.
2. overstep tripping protection system that is used for the colliery electrical network as claimed in claim 1; It is characterized in that; Also comprise a differential protection connection between said first switch and the second switch, also comprise a differential connection between said the 3rd switch and the 4th switch.
3. an overstep tripping protection system that is used for the colliery electrical network as claimed in claim 2 is characterized in that, said differential protection connection looped network connects or point-to-point connection.
4. an overstep tripping protection system that is used for the colliery electrical network as claimed in claim 2 is characterized in that said differential protection connection is communication cable or optical cable.
5. an overstep tripping protection system that is used for the colliery electrical network as claimed in claim 3 is characterized in that said looped network is the optical fiber ring network system, and said optical fiber ring network system also comprises optic fiber converter.
6. an overstep tripping protection system that is used for the colliery electrical network as claimed in claim 1 is characterized in that said switch is a high-voltage switch gear.
7. an overstep tripping protection system that is used for the colliery electrical network as claimed in claim 1 is characterized in that, it is inner that said longitudinal difference protection device is arranged at said switch.
8. an overstep tripping protection system that is used for the colliery electrical network as claimed in claim 7 is characterized in that, said longitudinal difference protection device is a full digital comprehensive protection device.
9. an overstep tripping protection system that is used for the colliery electrical network as claimed in claim 1 is characterized in that, the protection of said switch includes the overcurrent protection in fast tripping protection and band time limit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200509592U CN202455054U (en) | 2011-10-25 | 2012-02-13 | Override trip protection system for coal mine power grid |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120411539.8 | 2011-10-25 | ||
| CN201120411539 | 2011-10-25 | ||
| CN2012200509592U CN202455054U (en) | 2011-10-25 | 2012-02-13 | Override trip protection system for coal mine power grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202455054U true CN202455054U (en) | 2012-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012200509592U Expired - Lifetime CN202455054U (en) | 2011-10-25 | 2012-02-13 | Override trip protection system for coal mine power grid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023014A (en) * | 2012-11-05 | 2013-04-03 | 中国电力科学研究院 | Simulation method of integrated defense system for enhancing coal enterprise power system power supply reliability |
| CN103078301A (en) * | 2011-10-25 | 2013-05-01 | 上海山源电子电气科技发展有限公司 | Override trip protection system and method for coal mine power network |
| CN105490257A (en) * | 2015-12-30 | 2016-04-13 | 神华集团有限责任公司 | Underground safe power supply protection system |
-
2012
- 2012-02-13 CN CN2012200509592U patent/CN202455054U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078301A (en) * | 2011-10-25 | 2013-05-01 | 上海山源电子电气科技发展有限公司 | Override trip protection system and method for coal mine power network |
| CN103023014A (en) * | 2012-11-05 | 2013-04-03 | 中国电力科学研究院 | Simulation method of integrated defense system for enhancing coal enterprise power system power supply reliability |
| CN103023014B (en) * | 2012-11-05 | 2014-07-23 | 中国电力科学研究院 | Simulation method of integrated defense system for enhancing coal enterprise power system power supply reliability |
| CN105490257A (en) * | 2015-12-30 | 2016-04-13 | 神华集团有限责任公司 | Underground safe power supply protection system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI SHANYUAN ELECTRONIC TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SHANGHAI SHANYUAN ELECTRONIC SCIENCE + TECHNOLOGY DEVELOPMENT CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 201103 Shanghai, Wuzhong Road, Minhang District, No. 1050, 15 Patentee after: Shanghai Sany Electronic Technology Co.,Ltd. Address before: 201103 Shanghai, Wuzhong Road, Minhang District, No. 1050, 15 Patentee before: Shanghai Shanyuan Electronic Electrical Technology Development Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20120926 |
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| CX01 | Expiry of patent term |