CN101309006B - Selective leakage protective detection method and apparatus under coal mine - Google Patents
Selective leakage protective detection method and apparatus under coal mine Download PDFInfo
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- CN101309006B CN101309006B CN2008101231898A CN200810123189A CN101309006B CN 101309006 B CN101309006 B CN 101309006B CN 2008101231898 A CN2008101231898 A CN 2008101231898A CN 200810123189 A CN200810123189 A CN 200810123189A CN 101309006 B CN101309006 B CN 101309006B
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- sequence current
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- zero sequence
- mutual inductor
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Abstract
Disclosed is a selective current leakage detecting protection method and detecting device used in coal mine well. The method is characterized in that aiming at the three-phase branch being tested at the load side of a feed witch KF, a reference three-phase branch grounded through a capacitor is arranged at the inner power supply side of the same feed switch KF; a zero sequence current transformer for the branch being tested and a zero sequence current transformer for the reference branch are respectively arranged on the three-phase branch being tested and the reference three-phase branch. A detected signal processing circuit is also arranged, which can output current leakage control signal when the zero sequence current direction detected by the zero sequence current transformer on the branch being tested and the zero sequence current transformer on the reference branch is reverse. The detecting method of the invention can effectively eliminate the influence by the large distributed capacitance of the power network, suffices the field requirement and does not generate misoperation of leakage selection with reliable working.
Description
Technical field
The present invention relates to underground mine use electricity security protection detection method and checkout gear.More particularly relate to flame proof feeding switch selective earth leakage protection detection method and checkout gear.
Technical background
In the underground power supply system of colliery, as shown in Figure 4, at branch road low-voltage feeder switch KF
1, KF
2, KF
3, KF
4In selective leakage protection device is housed, leak detector is supporting in this device and the master switch KZ of system, realizes vertical protection and cross-protection.Vertical protection realizes that with the time difference cross-protection realizes that with power direction reaching certain branch road has unidirectional leak current fault, then this branch road feeding switch tripping operation, and a line feed of other non-electric leakages does not trip, and plays the purpose of selective earth leakage protection.Avoid a branch road electric leakage, influence the safety in production of other non-electric leakage branch roads.
Underground electric network is made up of cable, and cable distribution electric capacity is excessive to form influence to existing selective earth leakage protection, and phenomenon inoperative or misoperation happens occasionally, and has problem on functional reliability.Cause the reason of this problem be selective earth leakage protection in the prior art based on the detection principle be the power direction type that residual voltage and zero-sequence current are formed; residual voltage is taken from three-phase reactor central point high impedance two ends over the ground; its zero-sequence current is taken from the feeding switch load side and is sleeved on zero sequence current mutual inductor on the triple line; distributed capacitance and reactor central point equivalence over the ground are in parallel; when distributed capacitance is excessive; its capacitive reactance is very low; cause reactor central point earth impedance very low; its residual voltage descends significantly, and the residual voltage after the decline loses detectability.Cable has changed shielded type cable in recent years, and its distributed capacitance is bigger than former common cable distributed capacitance, and residual voltage can further reduce, and more can lose detectability.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point, selective earth leakage protection detection method and checkout gear under a kind of coal mine being provided, to eliminate the excessive influence that is brought of electrical network distributed capacitance.
Technical solution problem of the present invention adopts following technical scheme:
The characteristics of selective earth leakage protection detection method are to utilize feeding switch KF load side electric leakage branch road and the non-electric leakage branch road of mains side zero-sequence current direction to determine the tested three-phase branch road of electric leakage on the contrary under the coal mine of the present invention.
The characteristics of the inventive method also are at the tested three-phase branch road of feeding switch KF load side A
1, B
1, C
1, mains side is provided with terminal reference three-phase branch road A with capacitor C ground connection in same feeding switch
2, B
2, C
2As tested three-phase branch road A
1, B
1, C
1With reference three-phase branch road A
2, B
2, C
2In zero-sequence current direction when opposite, be judged to be tested three-phase branch road A
1, B
1, C
1Leak current fault is arranged.
The design feature of Coal mine downhole selective leakage protection detection device of the present invention is at the tested three-phase branch road of feeding switch KF load side A
1, B
1, C
1, mains side is provided with terminal reference three-phase branch road A with capacity earth in same feeding switch KF
2, B
2, C
2At tested three-phase branch road with on, tested branch road zero sequence current mutual inductor LI is set respectively with reference to the three-phase branch road
2With reference arm zero sequence current mutual inductor LI
1The detection signal treatment circuit is set, output leakage control signal when the zero-sequence current direction that the detection signal treatment circuit detects at described tested branch road zero sequence current mutual inductor and reference arm zero sequence current mutual inductor is opposite.
The design feature of apparatus of the present invention also is to be provided with tested branch road zero sequence current mutual inductor LI
2With reference arm zero sequence current mutual inductor LI
1End of the same name opposite; Described detection signal treatment circuit is for from tested branch road zero sequence current mutual inductor LI
2With reference arm zero sequence current mutual inductor LI
1Transducing signal synthesize the homophase square-wave signal through amplification, filtering and shaping respectively, described homophase square-wave signal through the phase angle voltage conversion circuit after in discriminator circuit corresponding output detection of electrical leakage high level signal, after described detection of electrical leakage high level signal triggers broadening via differential circuit, drive the execution relay at output circuit by triode, make tested branch road feeding switch tripping operation with the cut-offfing of contact of carrying out relay.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the inventive method is to utilize feeding switch load side electric leakage branch road and the non-electric leakage branch road of same feeding switch mains side zero-sequence current direction to judge the tested three-phase branch road of electric leakage on the contrary.For the excessive electrical network of distributed capacitance, zero-sequence current is also big.But in the inventive method, be not the size of considering zero-sequence current, just can not lose detectability as long as have zero-sequence current, detection method of the present invention satisfies on-the-spot requirement fully, choosing can not occur and leak misoperation.
2, among the present invention with reference to the setting of zero sequence current mutual inductor, be in order to take out mains side branch road zero-sequence current, so that compare with the direction of this feeding switch load side branch road zero-sequence current.Thereby judge whether this branch road has electric leakage, when having only this branch road feeding switch load side that electric leakage is arranged, above-mentioned two senses of current are just opposite.The setting of capacitor C is in order to produce zero-sequence current, otherwise can't take out zero-sequence current, though grounding through resistance also can take out zero-sequence current, and resistance value influences networking insulation values, inadvisable.Being provided with and amplifying and filter circuit, is for the interference signal of filtering from zero sequence current mutual inductor.Because zero-sequence transformer output signal voltage, minimum have only tens millivolts, add that stray electromagnetic interference may cause misoperation, amplification and filtering have been arranged, the useful signal amplitude has improved, the interference signal filtering, can avoid misoperation, improve reliability.
Description of drawings
Fig. 1 is a test side of the present invention structural representation.
Fig. 2 is a detection signal treatment circuit block diagram of the present invention.
Fig. 3 is a detection signal treatment circuit schematic diagram of the present invention.
Fig. 4 is the tested branch road feeding switch of a present invention schematic diagram.
Fig. 5 is that inventive principle is according to figure.
Below by embodiment, the invention will be further described in conjunction with the accompanying drawings.
Embodiment
The method that selective earth leakage protection detects under the coal mine in the present embodiment is to utilize feeding switch KF load side electric leakage branch road and the non-electric leakage branch road of mains side zero-sequence current direction to determine the tested three-phase branch road of electric leakage on the contrary.
Detection method in concrete the enforcement is at the tested three-phase branch road of feeding switch KF load side A
1, B
1, C
1, mains side is provided with terminal reference three-phase branch road A with capacitor C ground connection in feeding switch
2, B
2, C
2, it is protection electric equipment, phase fault and person electric leakage safety that earth leakage protective mainly acts on.For person electric leakage safety, capacitance current is the smaller the better.Cable natural capacity electric current is unavoidable, and otherwise capacitance current is as far as possible little, and this reference arm capacitance is embodied as about 3% of cable maximum distribution capacitance.Small to whole networking distributed capacitance capacity increment.As tested three-phase branch road A
1, B
1, C
1With reference three-phase branch road A
2, B
2, C
2In zero-sequence current direction when opposite, be judged to be tested three-phase branch road A
1, B
1, C
1Leak current fault is arranged.
Referring to Fig. 1, the Coal mine downhole selective leakage protection detection device in the present embodiment is at the tested three-phase branch road of feeding switch KF load side A
1, B
1, C
1, mains side is provided with terminal reference three-phase branch road A with capacitor C ground connection in feeding switch KF
2, B
2, C
2, with reference three-phase branch road A
2, B
2, C
2Simulate non-fault branch.At tested three-phase branch road A
1, B
1, C
1With reference three-phase branch road A
2, B
2, C
2On, tested branch road zero sequence current mutual inductor LI is set respectively
2With reference arm zero sequence current mutual inductor LI
1
Referring to Fig. 2, the detection signal treatment circuit is set in the present embodiment, the detection signal treatment circuit is at tested branch road zero sequence current mutual inductor LI
2With reference arm zero sequence current mutual inductor LI
1Output leakage control signal when the zero-sequence current direction that detects is opposite.
In concrete the enforcement, tested branch road zero sequence current mutual inductor LI is set
2With reference arm zero sequence current mutual inductor LI
1End of the same name opposite; Shown in Figure 2, the detection signal treatment circuit is for from tested branch road zero sequence current mutual inductor LI
2With reference arm zero sequence current mutual inductor LI
1Transducing signal synthesize the homophase square-wave signal through amplification, filtering and shaping respectively, the homophase square-wave signal through the phase angle voltage conversion circuit after, corresponding output detection of electrical leakage high level signal in discriminator circuit, after the detection of electrical leakage high level signal triggers broadening via differential circuit, drive the execution relay at output circuit by triode, make tested branch road feeding switch tripping operation with the cut-offfing of contact of carrying out relay, the setting of widening circuit is the reliably working that has further guaranteed drive circuit.
Referring to Fig. 3, the concrete setting comprises:
Amplifying circuit N
1, N
5By four high guaily unit 224 and peripheral resistance R
1, R
2, R
3, R
4, R
12, R
13, R
14, R
15And voltage-stabiliser tube DW
1, DW
2, DW
3, DW
4Constitute;
Filter circuit N
2, N
6By amplifier 224 and peripheral resistance R
5, R
6, R
7, R
16, R
17, R
18, capacitor C
1, C
2, C
3, C
4Form;
Shaping circuit N
3, N
7By amplifier 224 and peripheral resistance R
8, R
9, R
19, R
21, R
32With diode V
1, V
2Form;
The phase angle voltage conversion circuit is by R
10, R
23, C
5Form;
Discriminator circuit N
4By amplifier 224 and peripheral resistance R
24, R
25, R
26With diode V
3Form;
Widening circuit N
8By amplifier 224 and peripheral resistance R
28, R
29, R
30, capacitor C
7, diode V
4, V
5Form;
The square wave of discriminator circuit output is through capacitor C
6, resistance R
27The differential circuit that constitutes produces pulse widening circuit is triggered;
Triode BG in the output circuit and relay J constitute executive circuit.
Tested branch road zero sequence current mutual inductor LI is set in the present embodiment
2With reference arm zero sequence current mutual inductor LI
1End of the same name opposite, can greatly be convenient to the enforcement of circuit; When tested branch road load side electrical network has single-phase electric leakage, N
3, N
7Output has synchronous square-wave signal, through phase angle voltage conversion circuit R
10, R
23, C
5Square width is converted to the correspondent voltage value, and N4 output square wave is through C
6, R
27Trigger N
8, its output high potential, the J adhesive, its normally opened contact is controlled corresponding branch road feeding switch tripping operation.Because the leak detector of the master switch KZ of system leaks length than the KF choosing operate time, so master switch KZ does not trip; Simultaneously, two zero-sequence current directions are identical in the non-leak current fault branch road, but because the opposite form that is provided with of zero sequence current mutual inductor end of the same name makes the actual current direction in the zero sequence current mutual inductor opposite, therefore at circuit N
3, N
7The square wave of output is opposite, and clamp makes capacitor C mutually
5The two ends no-voltages have N
4Therefore export electronegative potential, N
8The output electronegative potential that also continues, triode GB Triggerless, the effect of selective earth leakage protection is so played in not adhesive of relay J.
In addition, signal amplification circuit input voltage-stabiliser tube DW shown in Figure 3
1, DW
2, DW
3, and DW
4Setting be for restriction high voltage input, avoid damaging N
1, N
2The diode V that the shaping circuit signal output part is provided with
1, V
2For the repid discharge loop, with C
5In last time remaining electric charge put only, for fault-signal next time enters C
5Prepare, otherwise will make the phase angle voltage transitions inaccurate; Diode V in the voltage conversion circuit of phase angle
3Be used to limit negative half-wave,, only get positive half wave because be converted to the voltage of direct current character.
Claims (2)
1. selective earth leakage protection detection method under the coal mine is characterized in that:
At the tested three-phase branch road of feeding switch (KF) load side (A
1, B
1, C
1), mains side is provided with terminal reference three-phase branch road (A with electric capacity (C) ground connection in same feeding switch
2, B
2, C
2); With reference three-phase branch road (A
2, B
2, C
2) simulate non-fault branch; As tested three-phase branch road (A
1, B
1, C
1) and with reference to three-phase branch road (A
2, B
2, C
2) in zero-sequence current direction when opposite, be judged to be tested three-phase branch road (A
1, B
1, C
1) leak current fault arranged;
At described tested three-phase branch road with on, tested branch road zero sequence current mutual inductor (LI is set respectively with reference to the three-phase branch road
2) and reference arm zero sequence current mutual inductor (LI
1); Described tested branch road zero sequence current mutual inductor (LI
2) and reference arm zero sequence current mutual inductor (LI
1) end of the same name opposite; From tested branch road zero sequence current mutual inductor (LI
2) and reference arm zero sequence current mutual inductor (LI
1) transducing signal synthesize the homophase square-wave signal through amplification, filtering and shaping respectively, described homophase square-wave signal through the phase angle voltage conversion circuit after in discriminator circuit corresponding output detection of electrical leakage high level signal, after described detection of electrical leakage high level signal triggers broadening via differential circuit, drive the execution relay at output circuit by triode, make described feeding switch (KF) tripping operation with the cut-offfing of contact of carrying out relay.
2. Coal mine downhole selective leakage protection detection device is characterized in that:
At the tested three-phase branch road of feeding switch (KF) load side (A
1, B
1, C
1), mains side is provided with terminal reference three-phase branch road (A with capacity earth in same feeding switch (KF)
2, B
2, C
2); At described tested three-phase branch road with on, tested branch road zero sequence current mutual inductor (LI is set respectively with reference to the three-phase branch road
2) and reference arm zero sequence current mutual inductor (LI
1); The detection signal treatment circuit is set, output leakage control signal when the zero-sequence current direction that described detection signal treatment circuit detects at described tested branch road zero sequence current mutual inductor and reference arm zero sequence current mutual inductor is opposite;
Described tested branch road zero sequence current mutual inductor (LI is set
2) and reference arm zero sequence current mutual inductor (LI
1) end of the same name opposite; Described detection signal treatment circuit is for from tested branch road zero sequence current mutual inductor (LI
2) and reference arm zero sequence current mutual inductor (LI
1) transducing signal synthesize the homophase square-wave signal through amplification, filtering and shaping respectively, described homophase square-wave signal through the phase angle voltage conversion circuit after in discriminator circuit corresponding output detection of electrical leakage high level signal, after described detection of electrical leakage high level signal triggers broadening via differential circuit, drive the execution relay at output circuit by triode, make described feeding switch (KF) tripping operation with the cut-offfing of contact of carrying out relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101231898A CN101309006B (en) | 2008-06-16 | 2008-06-16 | Selective leakage protective detection method and apparatus under coal mine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101231898A CN101309006B (en) | 2008-06-16 | 2008-06-16 | Selective leakage protective detection method and apparatus under coal mine |
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| Publication Number | Publication Date |
|---|---|
| CN101309006A CN101309006A (en) | 2008-11-19 |
| CN101309006B true CN101309006B (en) | 2010-06-09 |
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|---|---|---|---|
| CN2008101231898A Active CN101309006B (en) | 2008-06-16 | 2008-06-16 | Selective leakage protective detection method and apparatus under coal mine |
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| CN104467444B (en) * | 2013-09-16 | 2017-04-12 | 遵义长征电器智控设备有限责任公司 | Line fracture protection printed board |
| JP6324629B2 (en) * | 2015-06-19 | 2018-05-16 | 三菱電機株式会社 | Leakage current detector |
| CN115588964B (en) * | 2022-12-12 | 2023-03-03 | 杭州红芯微电子信息科技有限公司 | Threshold voltage correctable full-waveband leakage detection protection circuit |
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| CN101309006A (en) | 2008-11-19 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yang Yunfu Inventor after: Yang Bo Inventor before: Yang Yunfu |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: YANG YUNFU TO: YANG YUNFU YANG BO |
|
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Huainan Anhui Huaguang mining Electronic Technology Research Institute Assignor: Yang Yunfu Contract record no.: 2011340000478 Denomination of invention: Selective leakage protective detection method and apparatus under coal mine Granted publication date: 20100609 License type: Exclusive License Open date: 20081119 Record date: 20111219 |