CN103311883A - Leakage protection system and method for mine power distribution network - Google Patents
Leakage protection system and method for mine power distribution network Download PDFInfo
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- CN103311883A CN103311883A CN2013102529655A CN201310252965A CN103311883A CN 103311883 A CN103311883 A CN 103311883A CN 2013102529655 A CN2013102529655 A CN 2013102529655A CN 201310252965 A CN201310252965 A CN 201310252965A CN 103311883 A CN103311883 A CN 103311883A
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Abstract
A leakage protection system for a mine power distribution network comprises a single-phase earth detection and pilot frequency signal injection device and a plurality of leakage protection devices, wherein the single-phase grounding detection and pilot frequency signal injection device is used for detecting single-phase earth faults of the mine power distribution network and injecting pilot frequency signals into the earth phase of the mine power distribution network through a ground substation busbar of the mine power distribution network; and the plurality of leakage protection devices are used for detecting whether pilot frequency signals of phase lines of branch cables of the mine power distribution network are out of limit or not and commanding switches on the mine power distribution network to disconnect corresponding lines of out-of-limit phases. According to the leakage protection system and method, when the mine power distribution network has single-phase earth faults, the pilot frequency signals are injected into the ground substation busbar, the pilot frequency signals of the ground phases are detected through the leakage protection devices, tripping is performed after faults are judged, judging conditions are determinate, the accuracy is high, each leakage protection device is mounted on each branch cable of the power distribution network dispersedly and capable of judging independently and commanding corresponding protection switches to trip, and the reliability is high.
Description
Technical field
The invention belongs to the mine field of distribution network, relate in particular to a kind of mine power distribution network leakage protection system and guard method thereof.
Background technology
Because the particularity of colliery subsurface environment; it is high more than general ground industry with the probability that the person gets an electric shock that electric leakage occurs; in case down-hole distrbution network electric leakage occurs; can cause that not only the person gets an electric shock; but also may cause gas, matchmaker's dust explosion, even electric detonator is ignited in advance, therefore; must take practicable earth leakage protective measure, significant for mine safe power supply.
The fault signature of the direction of zero-sequence current, quintuple harmonics, zero sequence admittance etc. was as the earth leakage protective of basis for estimation when traditional mine power distribution network earth leakage protective was normally utilized single-phase earthing; because zero-sequence current can't be made accurate judgment greatly by the dynamic operational mode of electrical network and environmental impact, cause the malfunctioning problem of earth leakage protective.
Summary of the invention
Based on this, for above-mentioned technical problem, provide a kind of mine power distribution network leakage protection system and guard method thereof.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of mine power distribution network leakage protection system comprises:
Single phase earth fault detection and alien frequencies signal injection device, single phase ground fault for detection of the mine power distribution network, and the ground transformer substation bus by the mine power distribution network injects the alien frequencies signal to mine power distribution network Earth Phase, single phase earth fault detection and alien frequencies signal injection device are connected on the ground transformer substation bus of described mine power distribution network, and described alien frequencies signal differs from the power frequency component of mine power distribution network;
A plurality of earth leakage protective devices, whether out-of-limit for detection of the alien frequencies signal on each phase circuit of mine power distribution network branch cable, and the switch on the instruction mine power distribution network disconnects corresponding out-of-limit phase circuit, described a plurality of earth leakage protective device is located at respectively on a plurality of branch cables of described mine power distribution network, and is connected with described switch;
Described single phase earth fault detection and alien frequencies signal injection device are connected with described earth leakage protective device by the mine power distribution network.
Described single phase earth fault detection and alien frequencies signal injection device comprise single phase earth fault detection unit and alien frequencies signal generating unit, and described single phase earth fault detection unit is connected with described alien frequencies signal generating unit.
Described earth leakage protective device comprises alien frequencies signal filtering detecting unit and tripping operation control unit, and described alien frequencies signal filtering detecting unit is connected with described tripping operation control unit, and described tripping operation control unit is connected with described switch.
This programme also relates to a kind of mine power distribution network earth leakage protecting method, comprising:
Single phase earth fault detection and alien frequencies signal injection device detect in real time whether single-phase earthing occurs on the mine power distribution network, if not, then continue to detect, if, then
The ground transformer substation bus that single phase earth fault detection and alien frequencies signal injection device produce the alien frequencies signal and pass through the mine power distribution network is to mine power distribution network Earth Phase injection alien frequencies signal, and described alien frequencies signal differs from the power frequency component of mine power distribution network;
Whether the alien frequencies signal that a plurality of earth leakage protective devices detect on each phase circuit of mine power distribution network branch cable in real time is single-phase out-of-limit, if not, then continue to detect, if, then
Switch on the instruction mine power distribution network disconnects corresponding single-phase out-of-limit circuit, finishes earth leakage protective.
The present invention is when mine power distribution network generation single phase ground fault; inject an alien frequencies signal at the ground transformer substation bus; this alien frequencies signal characteristic is determined; and the stable impact that is not subjected to operational mode, electric network composition; detect the alien frequencies signal of Earth Phase by earth leakage protective device; and failure judgement is tripped; decision condition is determined; accuracy is high; on the branch cable that is installed in power distribution network that each earth leakage protective device disperses; can independently judge and the corresponding switch trip of instruction, reliability is high.
Description of drawings
The present invention is elaborated below in conjunction with the drawings and specific embodiments:
Fig. 1 is structural representation of the present invention.
Fig. 2 is principle schematic of the present invention.
Embodiment
Such as Fig. 1 and shown in Figure 2, a kind of mine power distribution network leakage protection system comprises single phase earth fault detection and alien frequencies signal injection device 110 and a plurality of earth leakage protective device 120.
Single phase earth fault detection and alien frequencies signal injection device 110 are connected with earth leakage protective device 120 by the mine power distribution network.
In the mine power distribution network, generally have ground transformer substation bus 21, central substation bus 22 and working section sub station bus 23, be connected with respectively a plurality of branch cables 24 on each bus, on each branch cable 24 switch 25 is installed all.
Single phase earth fault detection and alien frequencies signal injection device 110 are connected on the ground transformer substation bus 21 of mine power distribution network, everyly all need to connect single phase earth fault detection and alien frequencies signal injection device 110 for underground power supply used bus, can detect the single phase ground fault of mine power distribution network, and the ground transformer substation bus 21 by the mine power distribution network injects the alien frequencies signal to mine power distribution network Earth Phase, and the alien frequencies signal differs from the power frequency component of mine power distribution network.
Particularly, single phase earth fault detection and alien frequencies signal injection device 110 comprise single phase earth fault detection unit 111 and alien frequencies signal generating unit 112, and single phase earth fault detection unit 111 is connected with alien frequencies signal generating unit 112.
When mine power distribution network generation electric leakage was single phase ground fault, residual voltage will raise, and Earth Phase voltage will reduce, and other ungrounded phase voltages also can raise.Thus, whether the variation of single phase earth fault detection unit 111 by the above-mentioned voltage of real-time detection just can detect the mine power distribution network and leak electricity.
A plurality of earth leakage protective devices 120 are located at respectively on a plurality of branch cables 24 of mine power distribution network; and be connected with the switch on the mine power distribution network; whether out-of-limit for detection of the alien frequencies signal on mine power distribution network branch cable 24 each phase circuit; and the switch on the instruction mine power distribution network 25 disconnects corresponding out-of-limit phase circuit; can independently judge and corresponding switch 25 tripping operations of instruction, reliability is high.
Utilize Earth Phase and the ungrounded difference of sensing the alien frequencies signal of injection on mutually, can judge which bar circuit ground connection has occured, because the alien frequencies signal characteristic that injects is determined and the stable impact that is not subjected to operational mode, like this, decision condition is definite, and accuracy is high.
Particularly, earth leakage protective device 120 comprises alien frequencies signal filtering detecting unit 121 and tripping operation control unit 122, and alien frequencies signal filtering detecting unit 121 is connected with tripping operation control unit 122, and tripping operation control unit 122 is connected with switch 25.
Wherein, whether alien frequencies signal filtering detecting unit 121 is out-of-limit for detection of the alien frequencies signal on mine power distribution network branch cable 24 each phase circuit, when detecting out-of-limit situation, disconnect corresponding out-of-limit phase circuit by the switch 25 on the tripping operation control unit 122 instruction mine power distribution networks.
The present embodiment also comprises a kind of mine power distribution network earth leakage protecting method, comprising:
The single phase earth fault detection unit 111 of single phase earth fault detection and alien frequencies signal injection device 110 detects on the mine power distribution network whether single-phase earthing occurs in real time, if not, then continues to detect, if, then
The ground transformer substation bus 21 that the alien frequencies signal generating unit 112 of single phase earth fault detection and alien frequencies signal injection device 110 produces the alien frequencies signal and passes through the mine power distribution network is to mine power distribution network Earth Phase injection alien frequencies signal, and the alien frequencies signal differs from the power frequency component of mine power distribution network.
Wherein, when mine power distribution network generation electric leakage was single phase ground fault, residual voltage will raise, and Earth Phase voltage will reduce, and other ungrounded phase voltages also can raise.Thus, whether the variation of single phase earth fault detection unit 111 by the above-mentioned voltage of real-time detection just can detect the mine power distribution network and leak electricity.
Whether the alien frequencies signal that the alien frequencies signal filtering detecting unit 121 of a plurality of earth leakage protective devices 120 detects on mine power distribution network branch cable 24 each phase circuit in real time is single-phase out-of-limit, if not, then continue to detect, if, then
Switch 25 on the tripping operation control unit 122 instruction mine power distribution networks disconnects corresponding single-phase out-of-limit circuit, finishes earth leakage protective.
But, those of ordinary skill in the art will be appreciated that, above embodiment illustrates the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (4)
1. a mine power distribution network leakage protection system is characterized in that, comprising:
Single phase earth fault detection and alien frequencies signal injection device, single phase ground fault for detection of the mine power distribution network, and the ground transformer substation bus by the mine power distribution network injects the alien frequencies signal to mine power distribution network Earth Phase, single phase earth fault detection and alien frequencies signal injection device are connected on the ground transformer substation bus of described mine power distribution network, and described alien frequencies signal differs from the power frequency component of mine power distribution network;
A plurality of earth leakage protective devices, whether out-of-limit for detection of the alien frequencies signal on each phase circuit of mine power distribution network branch cable, and the switch on the instruction mine power distribution network disconnects corresponding out-of-limit phase circuit, described a plurality of earth leakage protective device is located at respectively on a plurality of branch cables of described mine power distribution network, and is connected with described switch;
Described single phase earth fault detection and alien frequencies signal injection device are connected with described earth leakage protective device by the mine power distribution network.
2. a kind of mine power distribution network leakage protection system according to claim 1; it is characterized in that; described single phase earth fault detection and alien frequencies signal injection device comprise single phase earth fault detection unit and alien frequencies signal generating unit, and described single phase earth fault detection unit is connected with described alien frequencies signal generating unit.
3. a kind of mine power distribution network leakage protection system according to claim 1 and 2; it is characterized in that; described earth leakage protective device comprises alien frequencies signal filtering detecting unit and tripping operation control unit; described alien frequencies signal filtering detecting unit is connected with described tripping operation control unit, and described tripping operation control unit is connected with described switch.
4. a mine power distribution network earth leakage protecting method is characterized in that, comprising:
Single phase earth fault detection and alien frequencies signal injection device detect in real time whether single-phase earthing occurs on the mine power distribution network, if not, then continue to detect, if, then
The ground transformer substation bus that single phase earth fault detection and alien frequencies signal injection device produce the alien frequencies signal and pass through the mine power distribution network is to mine power distribution network Earth Phase injection alien frequencies signal, and described alien frequencies signal differs from the power frequency component of mine power distribution network;
Whether the alien frequencies signal that a plurality of earth leakage protective devices detect on each phase circuit of mine power distribution network branch cable in real time is single-phase out-of-limit, if not, then continue to detect, if, then
Switch on the instruction mine power distribution network disconnects corresponding single-phase out-of-limit circuit, finishes earth leakage protective.
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| CN2013102529655A CN103311883A (en) | 2013-06-24 | 2013-06-24 | Leakage protection system and method for mine power distribution network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779576A (en) * | 2015-04-20 | 2015-07-15 | 上海山源电子科技股份有限公司 | Selective leakage protection method and system by composite signal method |
| CN114909966A (en) * | 2022-06-04 | 2022-08-16 | 北京伊拜科技有限责任公司 | Anti-interference wireless detonator with small antenna |
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| JP2004215478A (en) * | 2002-08-07 | 2004-07-29 | Kansai Electric Power Co Inc:The | Transmission line fault locator, transmission line fault locating method, transmission line fault locating program, and recording medium recording the program |
| CN2783338Y (en) * | 2004-12-08 | 2006-05-24 | 珠海泰坦科技股份有限公司 | Small current grounding line selector |
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| CN102035172A (en) * | 2010-12-21 | 2011-04-27 | 山西晋城无烟煤矿业集团有限责任公司 | Injection leakage protection method |
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| JP2004215478A (en) * | 2002-08-07 | 2004-07-29 | Kansai Electric Power Co Inc:The | Transmission line fault locator, transmission line fault locating method, transmission line fault locating program, and recording medium recording the program |
| CN2783338Y (en) * | 2004-12-08 | 2006-05-24 | 珠海泰坦科技股份有限公司 | Small current grounding line selector |
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| CN104779576A (en) * | 2015-04-20 | 2015-07-15 | 上海山源电子科技股份有限公司 | Selective leakage protection method and system by composite signal method |
| CN114909966A (en) * | 2022-06-04 | 2022-08-16 | 北京伊拜科技有限责任公司 | Anti-interference wireless detonator with small antenna |
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Application publication date: 20130918 |