CN203289073U - Electric leakage protection system for mine power distribution network - Google Patents
Electric leakage protection system for mine power distribution network Download PDFInfo
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- CN203289073U CN203289073U CN2013203643314U CN201320364331U CN203289073U CN 203289073 U CN203289073 U CN 203289073U CN 2013203643314 U CN2013203643314 U CN 2013203643314U CN 201320364331 U CN201320364331 U CN 201320364331U CN 203289073 U CN203289073 U CN 203289073U
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Abstract
An electric leakage protection system for a mine power distribution network comprises a signal-phase grounding detection and pilot frequency signal injection device and a plurality of electric leakage protection devices, wherein the single-phase grounding detection and pilot frequency signal injection device is connected to a ground substation busbar of the mine power distribution network, a pilot frequency signal is different form a power frequency signal of the mine power distribution network, the plurality of electric leakage protection devices are arranged on a plurality of branch cables of the mine power distribution network, and are connected with switches on the mine power distribution network, and the single-phase grounding detection and pilot frequency signal injection device is connected with the electric leakage protection devices through the mine power distribution network According to the electric leakage protection system for a mine power distribution network, when a single-phase grounding fault occurs in the mine power distribution network, a pilot frequency signal is injected to the ground substation busbar, the pilot frequency signal of a grounding phase is detected through the electric leakage protection devices, a fault is judged and tripping is performed, the judging criteria are definite, and the accuracy is high, the electric leakage protection devices are mounted on the branch cables of the power distribution network in a scattered manner, each of the electric leakage protection devices can independently judge and instruct a corresponding switch to trip, and the reliability is high.
Description
Technical field
The utility model belongs to the mine field of distribution network, relates in particular to a kind of mine power distribution network leakage protection system.
Background technology
Particularity due to the 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, electric detonator is ignited in advance, therefore; must take practicable earth leakage protective measure, significant for mine safe power supply.
When traditional mine power distribution network earth leakage protective is normally utilized single-phase earthing, the fault signature of the direction of zero-sequence current, quintuple harmonics, zero sequence admittance etc. is as the earth leakage protective of basis for estimation;, 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.
The utility model content
, based on this,, for above-mentioned technical problem, provide a kind of mine power distribution network leakage protection system.
For solving the problems of the technologies described above, the utility model 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, described 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, described a plurality of earth leakage protective devices are located at respectively on a plurality of branch cables of described mine power distribution network, and with the switch on described mine power distribution network, are connected;
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.
The utility model 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 arranged on 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
Be elaborated below in conjunction with the drawings and specific embodiments the utility model:
Fig. 1 is structural representation of the present utility model.
Fig. 2 is principle schematic of the present utility model.
Embodiment
As shown in Figure 1 and Figure 2, a kind of mine power distribution network leakage protection system, comprise 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 with the switch on the mine power distribution network, be connected; whether out-of-limit for detection of the alien frequencies signal on mine power distribution network branch cable 24 each phase circuits; and the switch on 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 occurred, 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 circuits, while out-of-limit situation being detected, by the switch 25 on tripping operation control unit 122 instruction mine power distribution networks, disconnect corresponding out-of-limit phase circuit.
Earth leakage protective process of the present utility model is as follows:
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, continues to detect, if,
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 circuits in real time is single-phase out-of-limit, if not, continue to detect, if,
Switch 25 on tripping operation control unit 122 instruction mine power distribution networks disconnects corresponding single-phase out-of-limit circuit, completes earth leakage protective.
But, those of ordinary skill in the art will be appreciated that, above embodiment illustrates the utility model, and not be used as restriction of the present utility model, as long as in connotation scope of the present utility model, to variation, the modification of the above embodiment, all will drop in claims scope of the present utility model.
Claims (3)
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, described 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, described a plurality of earth leakage protective devices are located at respectively on a plurality of branch cables of described mine power distribution network, and with the switch on described mine power distribution network, are connected;
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203643314U CN203289073U (en) | 2013-06-24 | 2013-06-24 | Electric leakage protection system for mine power distribution network |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203643314U CN203289073U (en) | 2013-06-24 | 2013-06-24 | Electric leakage protection system for mine power distribution network |
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| CN203289073U true CN203289073U (en) | 2013-11-13 |
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Cited By (1)
| 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 |
-
2013
- 2013-06-24 CN CN2013203643314U patent/CN203289073U/en not_active Expired - Lifetime
Cited By (1)
| 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 |
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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: 201100, Minhang District, Wuzhong Road, No. 15, building 1050, -1378, Shanghai Patentee after: Shanghai Sany Electronic Technology Co.,Ltd. Address before: 201100, Minhang District, Wuzhong Road, No. 15, building 1050, -1378, Shanghai Patentee before: Shanghai Shanyuan Electronic Electrical Technology Development Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20131113 |
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| CX01 | Expiry of patent term |