CN102185295B - Selective short-circuited protection device and method for mine low-voltage power supply system - Google Patents
Selective short-circuited protection device and method for mine low-voltage power supply system Download PDFInfo
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- CN102185295B CN102185295B CN201110107060.XA CN201110107060A CN102185295B CN 102185295 B CN102185295 B CN 102185295B CN 201110107060 A CN201110107060 A CN 201110107060A CN 102185295 B CN102185295 B CN 102185295B
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Abstract
The invention discloses a selective short-circuited protection device and a selective short-circuited protection method for a mine low-voltage power supply system. A main feed switch conducts output and is connected with two delay vacuum breakers, the outputs of both of the two delay vacuum breakers are connected with two paths in parallel, the two paths are connected with a vacuum contact respectively, and the vacuum contact is connected with the vacuum breaker in series respectively; short-circuited protection detection units are arranged in the main feed switch, the delay vacuum breakers and the vacuum contact respectively; the main feed switch, the delay vacuum breakers and the vacuum contact are connected with a comparator in parallel; the short-circuited protection detection units detect the short-circuited fault respectively and accordingly switch off the main feed switch; and if other faults are not detected, the comparator determines the line where the corresponding vacuum breaker is arranged as a fault line by comparing the parameters of the main feed switch, the delay vacuum breakers and the vacuum contact, and the corresponding vacuum contact sends closing signals to the switch. And the amplitude discrimination and phase discrimination combined short-circuit protection is adopted, so sensitivity is improved.
Description
Technical field
The present invention relates to a kind of selectivity short-circuit protection circuit of low-voltage power supply system, be applied to the short-circuit protection of Intelligent mining explosion-proof mobile substation low-voltage power supply system, also can be applicable to the short-circuit protection of other low-voltage variation system.
Background technology
In the power supply of colliery, because electric equipment residing environment in down-hole is severe, equipment moisture-sensitive, insulation natural aging, mechanical damage and over-voltage breakdown, artificial reasons such as misoperation, all very easily cause supply line and equipment phase shortage or short circuit, as excised not in time faulty line or equipment, often cause serious accident.Therefore, when there is short circuit and disconnected phase accident, should excise immediately faulty line and equipment, with accident prevention, spread.
Existing short-circuit protection method has: (1) adopts the short circuit current fuse of flowing through, and fuse is because of overheated fusing, thus the protection of the fuse of open failure circuit, and its defect is: excision is longer fault time, is only applicable to less demanding occasion.(2) thus adopting short circuit current to be greater than release operating current makes the thread off release protection of open failure circuit of release, can excise rapidly fault, adjust operating current, but cannot adjust operate time.(3) thus adopt short circuit current to be greater than the relay protection that actuating of relay electric current makes switch trip open failure circuit, be swift in motion, can adjust operate time, but have the place of DC power supply often to adopt.(4) thus while adopting short circuit, the power factor change of fault branch is carried out the phase sensitive short circuit protection of failure judgement branch road excision; without the size of considering starting current; can solve the problem that under coal mine, in remote power-feeding, large electric current is difficult to meet the demands as short-circuit signal, short-circuit protection, but be only applicable to three-phase symmetrical power consumption equipment.(5) adopt and on power circuit, apply high-frequency signal voltage; during short circuit, because impedance loop diminishes, high-frequency signal electric current increases, and signal voltage reduces even to disappear; thereby the carrier frequency short-circuit protection that makes switch trip excision fault, is often applied in electric coal drill short-circuit protection.
Summary of the invention
The selectivity short-circuit protection that the object of this invention is to provide a kind of mine low-voltage power supply system, makes to protect effect even more ideal.The present invention also provides the guard method of this selectivity short-circuit protection simultaneously, and the protection of amplitude discrimination formula and phase discriminator type protection are combined together, and improves sensitivity, rapidity and reliability.
The technical scheme that the selectivity short-circuit protection of mine low-voltage power supply system of the present invention adopts is: the output of phase shifting transformer is connected in series total feeding switch, the output of total feeding switch also connects 2 time delay vacuum circuit-breakers, the output of 2 time delay vacuum circuit-breakers all and connect 2 tunnels, this 2 road connects vacuum contactor respectively, and the output of vacuum contactor is connected in series vacuum circuit-breaker respectively; In total feeding switch, time delay vacuum circuit-breaker and vacuum circuit-breaker, be provided with respectively short-circuit protection detecting unit, vacuum circuit-breaker is respectively by switch stube cable earthing device; Total feeding switch, time delay vacuum circuit-breaker and vacuum circuit-breaker also connect comparator.
The technical scheme that the selectivity short-circuit protection method of mine low-voltage power supply system of the present invention adopts is to have following steps: when the fault end points on time delay vacuum circuit-breaker output line breaks down, corresponding short-circuit protection detecting unit detects respectively short trouble, if remaining short-circuit protection detecting unit also detects short trouble, disconnect total feeding switch; If remaining short-circuit protection detecting unit does not detect short trouble; Comparator is faulty line by the relatively more definite corresponding time delay vacuum circuit-breaker place circuit to parameter on total feeding switch, time delay vacuum circuit-breaker and vacuum circuit-breaker circuit, disconnects this time delay vacuum circuit-breaker, and other devices are failure to actuate; 2), when there is three-phase asymmetry short circuit fault, corresponding short-circuit protection detecting unit detects respectively short trouble; If remaining short-circuit protection detecting unit also detects short trouble, disconnect total feeding switch; If remaining short-circuit protection detecting unit does not detect short trouble; comparator is faulty line by the relatively more definite corresponding vacuum circuit-breaker place circuit to parameter on total feeding switch, time delay vacuum circuit-breaker and vacuum circuit-breaker circuit; disconnect this vacuum circuit-breaker; corresponding vacuum contactor sends closure signal to switch, and other devices are failure to actuate.
The present invention's advantage is compared with prior art:
1, single amplitude discrimination formula short circuit current protection cannot be distinguished starting current and short circuit current in the past; operating value is more difficult to be adjusted; easily malfunction, tripping; single phase discriminator type short-circuit protection is easily malfunction, tripping also; poor reliability; the present invention adopts the hybrid short-circuit protection of amplitude discrimination phase demodulation that amplitude discrimination and phase demodulation are combined, and has improved sensitivity, and protection effect is comparatively desirable.
2, due to phase discriminator type short-circuit protection monitoring be the variation of power factor, again owing to being transformer station movably, so there is not the problem that guard space is inadequate.
3, single phase-sensitive protection can only be applied in three-phase symmetrical short trouble, adopts the ratio amplitude ratio phase rule of negative-sequence current, negative sequence voltage to solve this problem, and asymmetry short circuit fault is also protected.
What 4, adopt negative-sequence current, negative sequence voltage can realize optionally short-circuit protection than width phase comparing method, disjunction faulty line selectively, both disjunction faulty line, guaranteed that again the safety of other non-fault line is normally moved.
5, the air type switch in the past breath arc time long, the blow-out time of employing vacuum circuit-breaker and vacuum contactor is short, is conducive to improve the rapidity of short-circuit protection, and protection equipment is played to vital effect.
While 6, breaking down, cable easily produces spark, often burns, and shielded type cable has prevented that short circuiting arc from leaking well, has also improved the integrated explosion proof system of low-voltage power supply system.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of selectivity short-circuit protection of the present invention;
In figure: T. phase shifting transformer; A. total feeding switch; B1, B2. time delay vacuum circuit-breaker; C1, C2, C3, C4. vacuum contactor; D1, D2, D3, D4. vacuum circuit-breaker; E1, E2, E3, E4, E5, E6, E7. short-circuit protection detecting unit; F1, F2. comparator; G. cable grounding device; K1, K2. fault end.
Embodiment
Referring to Fig. 1, the output of phase shifting transformer T is connected in series total feeding switch A, the output of total feeding switch A also meets 2 time delay vacuum circuit-breaker B1, B2, the output of time delay vacuum circuit-breaker B1 also connects 2 tunnels, one tunnel meets vacuum contactor C1, the output serial connection vacuum circuit-breaker D1 of vacuum contactor C1, another road meets vacuum contactor C2, and the output of vacuum contactor C2 connects vacuum circuit-breaker D2.The output of vacuum circuit-breaker B2 also connects 2 tunnels, and a road meets vacuum contactor C3, the output serial connection vacuum circuit-breaker D3 of vacuum contactor C3, and another road meets vacuum contactor C4, the output serial connection vacuum circuit-breaker D4 of vacuum contactor C4.
Total feeding switch A, time delay vacuum circuit-breaker B1, B2, be respectively equipped with short-circuit protection detecting unit E1, E2, E3, E4, E5, E6, E7 in vacuum circuit-breaker D1, D2, D3, D4.Vacuum circuit-breaker D1, D2, D3, D4 are connected in series respectively vacuum contactor C1, C2, C3, C4.Vacuum circuit-breaker D1, D2, D3, D4 are respectively by switch J1, J2, J3, J4 stube cable earthing device G.Vacuum circuit-breaker D1, D2, D3, D4 transmission line material below all adopts cable material, and cable grounding device G is by the closure of vacuum contactor C1, C2, C3, C4 control switch J1, J2, J3, J4.
Total feeding switch A, time delay vacuum circuit-breaker B1, vacuum circuit-breaker D1 and vacuum circuit-breaker D2 also meet comparator F1, and total feeding switch A, time delay vacuum circuit-breaker B2, vacuum circuit-breaker D3 and vacuum circuit-breaker D4 also meet comparator F2.
When the fault end points on time delay vacuum circuit-breaker output line breaks down; for example; fault end K1 point on time delay vacuum circuit-breaker B2 output line breaks down, and corresponding short-circuit protection detecting unit E1, E3, E6, E7 on total feeding switch A, time delay vacuum circuit-breaker B2, vacuum circuit-breaker D3, vacuum circuit-breaker D4 detect respectively short trouble.If remaining time delay vacuum circuit-breaker B1, vacuum circuit-breaker D1, the short-circuit protection detecting unit E2 of vacuum circuit-breaker D2, E4, E5 also detect short trouble, disconnect rapidly total feeding switch A, prevent from burning transformer T; If remaining time delay vacuum circuit-breaker B1, vacuum circuit-breaker D1, the short-circuit protection detecting unit E2 of vacuum circuit-breaker D2, E4, E5 do not detect short trouble; comparator F2 is faulty line by the relatively more definite corresponding time delay vacuum circuit-breaker B2 place circuit to parameter on total feeding switch A, time delay vacuum circuit-breaker B2, vacuum circuit-breaker D3, vacuum circuit-breaker D4 circuit; rapid off delay vacuum circuit-breaker B2, other devices are failure to actuate.
When there is three-phase asymmetry short circuit fault; for example, when the fault end K2 point on vacuum circuit-breaker D4 output line breaks down, corresponding short-circuit protection detecting unit E1, E3, E6, E7 on total feeding switch A, time delay vacuum circuit-breaker B2, vacuum circuit-breaker D3, vacuum circuit-breaker D4 detect respectively short trouble.If remaining time delay vacuum circuit-breaker B1, vacuum circuit-breaker D1, the short-circuit protection detecting unit E2 of vacuum circuit-breaker D2, E4, E5 also detect short trouble, disconnect rapidly total feeding switch A, prevent from burning phase shifting transformer T.If remaining time delay vacuum circuit-breaker B1, vacuum circuit-breaker D1, the short-circuit protection detecting unit E2 of vacuum circuit-breaker D2, E4, E5 do not detect short trouble; comparator F2 is faulty line by relatively more definite corresponding this vacuum circuit-breaker D4 place circuit to parameter on total feeding switch A, time delay vacuum circuit-breaker B2, vacuum circuit-breaker D3, vacuum circuit-breaker D4 circuit; disconnect rapidly vacuum circuit-breaker D4; vacuum contactor C4 sends closure signal to switch; complete the protective earthing of this cable line, other devices are failure to actuate.Detection by short-circuit protection detecting unit to negative-sequence current, disengagement failure loop, has made up regretting that " phase sensitivity " protection can only be worked in three-phase symmetrical short trouble effectively.Adopt current/voltage phase comparing method, by the comparison to negative-sequence current and negative sequence voltage phase place, can Judging fault circuit and non-fault line, thus horizontal and vertical selective excision faulty line, and do not affect the safe operation of other regular link.
Claims (1)
1. the selectivity short-circuit protection method of a mine low-voltage power supply system, adopt the selectivity short-circuit protection of mine low-voltage power supply system, the selectivity short-circuit protection of described mine low-voltage power supply system comprises total feeding switch, the output of phase shifting transformer is connected in series total feeding switch, the output of total feeding switch also connects 2 time delay vacuum circuit-breakers, the output of 2 time delay vacuum circuit-breakers all and connect 2 tunnels, this 2 road connects vacuum contactor respectively, and the output of vacuum contactor is connected in series vacuum circuit-breaker respectively; In total feeding switch, time delay vacuum circuit-breaker and vacuum circuit-breaker, be provided with respectively short-circuit protection detecting unit, vacuum circuit-breaker is respectively by switch stube cable earthing device; Total feeding switch, time delay vacuum circuit-breaker and vacuum circuit-breaker also connect comparator, it is characterized in that having following steps:
1), when the end points on time delay vacuum circuit-breaker output line breaks down, corresponding short-circuit protection detecting unit detects respectively short trouble, if remaining short-circuit protection detecting unit also detects short trouble, disconnects total feeding switch; If remaining short-circuit protection detecting unit does not detect short trouble; Comparator is faulty line by the relatively more definite corresponding time delay vacuum circuit-breaker place circuit to parameter on total feeding switch, time delay vacuum circuit-breaker and vacuum circuit-breaker circuit, disconnects this time delay vacuum circuit-breaker;
2), when there is three-phase asymmetry short circuit fault, corresponding short-circuit protection detecting unit detects respectively short trouble; If remaining short-circuit protection detecting unit also detects short trouble, disconnect total feeding switch; If remaining short-circuit protection detecting unit does not detect short trouble; comparator is faulty line by the relatively more definite corresponding vacuum circuit-breaker place circuit to parameter on total feeding switch, time delay vacuum circuit-breaker and vacuum circuit-breaker circuit; disconnect this vacuum circuit-breaker, corresponding vacuum contactor sends closure signal to switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110107060.XA CN102185295B (en) | 2011-04-27 | 2011-04-27 | Selective short-circuited protection device and method for mine low-voltage power supply system |
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| CN201110107060.XA CN102185295B (en) | 2011-04-27 | 2011-04-27 | Selective short-circuited protection device and method for mine low-voltage power supply system |
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| CN102185295A CN102185295A (en) | 2011-09-14 |
| CN102185295B true CN102185295B (en) | 2014-08-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2994349A1 (en) * | 2012-08-02 | 2014-02-07 | Schneider Electric Ind Sas | SYSTEM FOR PROTECTING A PLURALITY OF ELECTRICAL DEPARTURES AGAINST SHORT CIRCUITS, AND ELECTRICAL INSTALLATION COMPRISING SUCH A PROTECTION SYSTEM |
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| CN2245290Y (en) * | 1995-06-06 | 1997-01-15 | 郑明� | Selective comprehensive protector for electrical leakage, phase-sensitive short circuit |
| CN101046499A (en) * | 2007-02-13 | 2007-10-03 | 傅桂兴 | Method of detecting triphase asymmetry failure in low voltage line and comprehensive protection module |
| CN202084914U (en) * | 2011-04-27 | 2011-12-21 | 江苏大学 | Selective short-circuit protection device of mine low voltage power supply system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007036513A1 (en) * | 2007-08-01 | 2009-02-05 | Rational Ag | Method for energy-savingly leading a food treatment process or treatment room cleaning process and cooking appliance therefor |
| DE102008030987A1 (en) * | 2008-06-27 | 2010-01-07 | Siemens Aktiengesellschaft | Method for selective tripping of circuit breakers in the event of a short circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2245290Y (en) * | 1995-06-06 | 1997-01-15 | 郑明� | Selective comprehensive protector for electrical leakage, phase-sensitive short circuit |
| CN101046499A (en) * | 2007-02-13 | 2007-10-03 | 傅桂兴 | Method of detecting triphase asymmetry failure in low voltage line and comprehensive protection module |
| CN202084914U (en) * | 2011-04-27 | 2011-12-21 | 江苏大学 | Selective short-circuit protection device of mine low voltage power supply system |
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