CN204089159U - The undetected protective circuit of a kind of underground coal mine mains lighting supply - Google Patents
The undetected protective circuit of a kind of underground coal mine mains lighting supply Download PDFInfo
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- CN204089159U CN204089159U CN201420365888.4U CN201420365888U CN204089159U CN 204089159 U CN204089159 U CN 204089159U CN 201420365888 U CN201420365888 U CN 201420365888U CN 204089159 U CN204089159 U CN 204089159U
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- 230000001681 protective effect Effects 0.000 title claims abstract description 22
- 239000003245 coal Substances 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 230000003111 delayed effect Effects 0.000 claims description 6
- 239000004821 Contact adhesive Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- 230000005283 ground state Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
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Abstract
The utility model relates to underground coal mine mains lighting supply earth leakage protective detection technique field, specifically the undetected protective circuit of a kind of underground coal mine mains lighting supply, is switched realize source-drain locking, earth leakage protective integrated protection by the actuating of relay.Line electrical leakage locking detection is carried out by insulation resistance RL in major loop off-position, as normal in detected, time-delay relay KT1 adhesive, relay K 1 action, major loop is connected, earth leakage search/lockout loop disconnects, leakage detecting circuit is connected, after this by detecting zero-sequence current Io, carry out line electrical leakage detection, in the process, as leaked electricity, by voltage comparator LM339 output control relay K2, K3 action, then relay K 1 action, major loop open circuit, major loop is by resistance R15 ground connection, be in earth leakage search/lockout state, major loop relay K 1 normally opened contact cannot adhesive.Compare traditional detection method, this circuit composition is simple, and highly sensitive, operate time is short, and circuit stability is reliable.
Description
Technical field
The utility model relates to underground coal mine mains lighting supply earth leakage protective detection technique field; be exactly the undetected protective circuit of a kind of underground coal mine mains lighting supply specifically; by the switching of relay normally open, normally-closed contact; realize the earth leakage search/lockout of underground coal mine mains lighting supply and earth leakage protective circuit, ensure that the fail safe that underground coal mine mains lighting supply uses.
Background technology
Leak current fault is underground coal mine low-voltage lighting system frequency fault the most frequently, and the ratio in total failare is up to more than 80%.The generation of underground coal mine electric leakage accident not only can cause the person to get an electric shock, but also likely causes gas, coal-dust explosion, serious also can ahead detonate electrical equipment detonator, therefore, leakage protection system is the most important thing of underground coal mine power supply protection.Under normal circumstances, underground coal mine is all install earth leakage protective to detect at power outlet place, and in magnetic starter, install earth leakage search/lockout detect, checkout equipment is various, complex structure.This utility model utilizes the switching of relay normally open, normally-closed contact, carries out earth leakage search/lockout and earth leakage protective change detection at power outlet place, and line construction is simple, highly sensitive.
Summary of the invention
The purpose of this utility model is to provide the comprehensive undetected protective circuit of the underground coal mine mains lighting supply of a kind of integrated earth leakage search/lockout together with earth leakage protective.
The technical scheme that the utility model adopts is: comprise delayed switching circuit, electric leakage shutting detection circuit and earth leakage protective testing circuit; Delayed switching circuit comprises relay K 1 and time-delay relay KT1, two normally opened contacts of relay K 1 are series at major loop for controlling the break-make of major loop, a normally-closed contact is series at electric leakage shutting detection circuit for controlling the break-make of electric leakage shutting detection circuit, a normally opened contact is series at earth leakage protective testing circuit for controlling the break-make of electric leakage shutting detection circuit, the action of the normally opened contact control relay K1 of time-delay relay KT1; When circuit carries out earth leakage search/lockout detection, power supply+12V, resistance R5 and insulating resistance of cable form bleeder circuit, produce voltage with reference voltage after voltage comparator LM339 compares, the action of output signal control relay K2, when insulating resistance of cable is reduced to below 4K, relay K 2 normally-closed contact disconnects, normally opened contact adhesive, and major loop is through resistance R15 ground connection; When earth leakage protective of carrying out circuit detects; major loop produces zero-sequence current through diode D3 halfwave rectifier; produce residual voltage with reference voltage after voltage comparator LM339 compares through resistance R6, the action of output signal control relay K3, when insulating resistance of cable is reduced to below 2K; relay K 3 normally-closed contact disconnects; normally opened contact adhesive, relay K 1 action then, major loop power-off; relay K 2 action, major loop is through resistance R15 ground connection.
Actual effect of the present utility model is: this circuit composition is simple, and highly sensitive, operate time is short, and circuit stability is reliable.
Below in conjunction with the drawings and specific embodiments, the technical solution of the utility model is described in detail.
Accompanying drawing explanation
Fig. 1: the utility model electrical schematic diagram.
Embodiment
The utility model comprises delayed switching circuit, electric leakage shutting detection circuit and earth leakage protective testing circuit.
Delayed switching circuit operation principle: two normally opened contacts of relay K 1 are series at major loop for controlling the break-make of major loop; a normally-closed contact is series at electric leakage shutting detection circuit for controlling the break-make of electric leakage shutting detection circuit, and a normally opened contact is series at earth leakage protective testing circuit for controlling the break-make of electric leakage shutting detection circuit.The action of the normally opened contact control relay K1 of time-delay relay KT1.
Electric leakage shutting detection circuit operation principle :+12V power supply forms bleeder circuit through the insulation resistance of resistance R5, relay K 1 normally-closed contact, main loop cabling, produce voltage enters voltage comparator LM339 7 pin through resistance R8, resistance R1 and diode D1 plays current-limiting protection effect, and C1 is filter capacitor; The bleeder circuit that+12V power supply is formed through resistance R7 and R10 produces voltage U
r10enter 6 pin of voltage comparator LM339 through resistance R9, after two-phase voltage compare, 1 pin through LM339 exports the action that low and high level carrys out control relay K2, and diode D6 is the afterflow protection of relay K 2.The normally opened contact of relay K 2 is in parallel with the normally opened contact of relay K 3, one end access main loop cabling, and the other end is through resistance R15 ground connection, and protection major loop is when there being electric leakage to occur, and be in ground state, relay K 1 normally opened contact cannot adhesive always.
Earth leakage protective testing circuit operation principle: the bleeder circuit that+12V power supply is formed through resistance R11 and R12 produces voltage U
r11enter 5 pin of LM339 through resistance R13, major loop produces zero-sequence current and produces residual voltage U through resistance R6 after resistance R3 and diode D3 halfwave rectifier
r6, after diode D5, electric capacity C2 rectifying and wave-filtering, enter 4 pin of LM339 through R14, after two-phase voltage compare, 1 pin through LM339 exports the action that low and high level carrys out control relay K3, and diode D7 is the afterflow protection of relay K 3.The normally opened contact of relay K 3 is in parallel with the normally opened contact of relay K 2, one end access main loop cabling, and the other end is through resistance R15 ground connection, and protection major loop is when there being electric leakage to occur, and be in ground state, major loop relay K 1 normally opened contact cannot adhesive always.
Claims (1)
1. the undetected protective circuit of underground coal mine mains lighting supply, is characterized in that: comprise delayed switching circuit, electric leakage shutting detection circuit and earth leakage protective testing circuit; Delayed switching circuit comprises relay (K1) and time-delay relay (KT1), two normally opened contacts of relay (K1) are series at major loop for controlling the break-make of major loop, a normally-closed contact is series at electric leakage shutting detection circuit for controlling the break-make of electric leakage shutting detection circuit, a normally opened contact is series at earth leakage protective testing circuit for controlling the break-make of electric leakage shutting detection circuit, the action of the normally opened contact control relay (K1) of time-delay relay (KT1); When circuit carries out earth leakage search/lockout detection, power supply (+12V), resistance (R5) and insulating resistance of cable form bleeder circuit, produce voltage with reference voltage after voltage comparator (LM339) compares, the action of output signal control relay (K2), when insulating resistance of cable is reduced to below 4K, relay (K2) normally-closed contact disconnects, normally opened contact adhesive, and major loop is through resistance (R15) ground connection; When earth leakage protective of carrying out circuit detects; major loop produces zero-sequence current through diode (D3) halfwave rectifier; residual voltage is produced with reference voltage after voltage comparator (LM339) compares through resistance (R6); the action of output signal control relay (K3); when insulating resistance of cable is reduced to below 2K; relay (K3) normally-closed contact disconnects; normally opened contact adhesive; then relay (K1) action; major loop power-off; relay (K2) action, major loop is through resistance (R15) ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420365888.4U CN204089159U (en) | 2014-07-04 | 2014-07-04 | The undetected protective circuit of a kind of underground coal mine mains lighting supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420365888.4U CN204089159U (en) | 2014-07-04 | 2014-07-04 | The undetected protective circuit of a kind of underground coal mine mains lighting supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204089159U true CN204089159U (en) | 2015-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420365888.4U Expired - Lifetime CN204089159U (en) | 2014-07-04 | 2014-07-04 | The undetected protective circuit of a kind of underground coal mine mains lighting supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204089159U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707087A (en) * | 2017-02-04 | 2017-05-24 | 山西全安新技术开发有限公司 | Grounding monitoring and controlling method and system for underground electric equipment |
| CN113625043A (en) * | 2021-08-16 | 2021-11-09 | 中煤科工集团重庆研究院有限公司 | Feed state detection method for active and passive fusion detection |
-
2014
- 2014-07-04 CN CN201420365888.4U patent/CN204089159U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707087A (en) * | 2017-02-04 | 2017-05-24 | 山西全安新技术开发有限公司 | Grounding monitoring and controlling method and system for underground electric equipment |
| CN106707087B (en) * | 2017-02-04 | 2024-04-05 | 山西全安新技术开发有限公司 | Underground electrical equipment grounding monitoring method and system |
| CN113625043A (en) * | 2021-08-16 | 2021-11-09 | 中煤科工集团重庆研究院有限公司 | Feed state detection method for active and passive fusion detection |
| CN113625043B (en) * | 2021-08-16 | 2024-04-19 | 中煤科工集团重庆研究院有限公司 | Feed state detection method for active and passive fusion detection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20150107 |