CN203445594U - Novel explosion-proof type low-voltage selective electric leakage protector used for mining - Google Patents
Novel explosion-proof type low-voltage selective electric leakage protector used for mining Download PDFInfo
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- CN203445594U CN203445594U CN201320554774.XU CN201320554774U CN203445594U CN 203445594 U CN203445594 U CN 203445594U CN 201320554774 U CN201320554774 U CN 201320554774U CN 203445594 U CN203445594 U CN 203445594U
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Abstract
The utility model relates to a novel explosion-proof type low-voltage selective electric leakage protector used for mining. The technical characteristics of the novel explosion-proof type low-voltage selective electric leakage protector are that: the novel explosion-proof type low-voltage selective electric leakage protector comprises a one-chip microcomputer, a power supply unit, a liquid crystal display module, a signal detection and processing circuit, a communication module and a driving trip-out circuit. The power supply unit is connected with the one-chip microcomputer and the liquid crystal display module and used for supplying power to the one-chip microcomputer and the liquid crystal display module. The one-chip microcomputer is connected with a zero sequence current mutual inductor installed on a power supply system via the signal detection and processing circuit so that a function of electric leakage detection is realized. The one-chip microcomputer is connected with a trip-out actuating mechanism installed on the power supply system via the driving trip-out circuit so that a function of trip-out control is realized. The one-chip microcomputer is connected with a remote monitoring host via the communication module so that a function of remote monitoring is realized. The novel explosion-proof type low-voltage selective electric leakage protector is reasonable in design so that a function of main lines and branch lines grading selective electric leakage protection of a no neutral point grounding power supply system under a coal mine is realized, the coal mine automation level and power supply quality are enhanced, and personal and machine device safety is better ensured.
Description
Technical field
The utility model belongs to earth leakage protective device technical field, especially a kind of Novel mine explosion-proof type selective low-voltage earth leakage protective device.
Background technology
Electric equipment under coal mine is normally powered by mine low-voltage electricity grid.At present, China's coal-mine down-hole generally adopts the earth-free electric power system of transformer neutral point (neutral point insulation supply network).As shown in Figure 3, in neutral point insulation supply network, down-hole all adopts cable as carrier, three-phase conducting wire insulate over the ground, and insulating material has the resistance R 1 of certain numerical value, R2, R3(is insulation against ground resistance), total cable length is longer, and insulation resistance is less; In addition, three wires also have certain distributed capacitance C1, C2, C3 over the ground; Equally, transformer T itself also has insulation against ground resistance and distributed capacitance.In fact electrical network is to be respectively connected with the earth with distributed capacitance C by insulation resistance R mutually.For fear of cause device damage or personnel's injury due to the electric leakage of power supply network system; earth leakage protective device is installed conventionally in electric power system; existing earth leakage protective device exists accuracy of detection low conventionally; reliability is low; poor selectivity, false tripping main switch; the problems such as communications protocol is single, poor anti jamming capability, are difficult to meet the power reguirements of selective earth leakage protection under coal mine.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of reasonable in design, reliability is high and the Novel mine explosion-proof type selective low-voltage earth leakage protective device of stable performance.
The utility model solves existing technical problem and takes following technical scheme to realize:
A kind of Novel mine explosion-proof type selective low-voltage earth leakage protective device, comprise single-chip microcomputer, power subsystem, LCD MODULE, input and treatment circuit, switching input module, keyboard input module, relay output module, watchdog circuit, communication module and driving trip circuit, power subsystem is connected for its power supply with single-chip microcomputer and LCD MODULE, single-chip microcomputer by input and treatment circuit be arranged on zero sequence current mutual inductor in electric power system and be connected and realize earth leakage detection functions, single-chip microcomputer respectively with LCD MODULE, switching input module, keyboard input module, relay output module, watchdog circuit is connected, single-chip microcomputer is by driving trip circuit and being arranged on tripping operation actuator in electric power system and being connected and realizing tripping operation control function, single-chip microcomputer is connected and realizes remote monitoring function with remote monitoring main frame by communication module.
And described input and treatment circuit comprise zero sequence voltage phase shifting circuit, residual voltage Circuit tuning, zero cross detection circuit, the first photoelectric coupling circuit, the first reverser, zero-sequence current Circuit tuning, overcurrent sensing circuit, the second photoelectric coupling circuit, the second reverser; Zero sequence voltage phase shifting circuit, residual voltage Circuit tuning, zero cross detection circuit, the first photoelectric coupling circuit, the first reverser are connected successively, wherein, the input of zero sequence voltage phase shifting circuit is connected with zero sequence current mutual inductor, and the output of the first reverser is connected with single-chip microcomputer; Zero-sequence current Circuit tuning, overcurrent sensing circuit, the second photoelectric coupling circuit, the second reverser are connected successively, wherein, the input of zero-sequence current Circuit tuning is connected with zero sequence current mutual inductor, the output of the second reverser is connected with single-chip microcomputer.
And described communication module is a kind of in ethernet communication module, CAN communication module, RS485 communication module or their combination.
And described tripping operation actuator is circuit breaker, A.C. contactor or the magnetic starter of shunt release, no-voltage release.
And described single-chip microcomputer also connects an audible-visual annunciator.
And described single-chip microcomputer also connects a status indicator lamp.
Advantage of the present utility model and good effect are:
1, this earth leakage protective device detects the state of each branch road of electric power system automatically by single-chip microcomputer, and by the circuit breaker of shunt release or no-voltage release, A.C. contactor, magnetic starters etc. form earth leakage protective device, realize mining explosion-isolating low-voltage selective earth leakage protection function, that is: in mine low-voltage electricity grid, a certain person that occurs mutually of certain branch road gets an electric shock, when single-phase electric discharge over the ground or single-phase Ground leakage current, system detects in time leak current fault and drives tripping operation actuator, thereby disengagement failure circuit selectively, but still can guarantee non-fault line safe operation, reached under coal mine without the earth leakage protective accuracy of neutral ground and reliability requirement, thereby protect better the feed safety under coal mine.
2, this earth leakage protective device can carry out communication by RS485, Ethernet or CAN communication modes and remote monitoring main frame and realizes remote monitoring and protection; There is sound and light of alarm simultaneously, from vision and the sense of hearing two aspect prompting staff leakage-current alarm information, and have historical alarm logging query function.
3, this earth leakage protective device can detect the leakage current that is less than 30 milliamperes, highly sensitive, can effectively prevent accident of human electric shock's generation.
4, this earth leakage protective device is easy and simple to handle, and operating personnel, without through professional training, can use by left-hand seat, and monitoring, protection, controls function and be integrated in one, safe and reliable, simple and practical.
5, the utility model is reasonable in design; main line and branch line hierarchical selective creepage protection function without neutral ground electric power system have been realized under coal mine; mine automation level and power supply quality have been improved; the person and machinery equipment safety have been guaranteed better; effectively prevented the generation of colliery electrical fire; there is the features such as non-maintaining, reliability is high, antijamming capability is strong, can be widely used in voltage AC380,660,1140,3300V, in frequency 50HZ Coal Mine Power Distribution System.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model;
Fig. 2 is the circuit block diagram of input of the present utility model and treatment circuit;
Fig. 3 is application connection diagram of the present utility model;
Fig. 4 is selective earth leakage protection schematic diagram of the present utility model;
Fig. 5 is the process chart of single-chip microcomputer embedded software of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is further described.
A selective low-voltage earth leakage protective device, as shown in Figure 1, comprises single-chip microcomputer, power subsystem, LCD MODULE, input and treatment circuit, switching input module, keyboard input module, relay output module, watchdog circuit, experimental circuit, status indicator lamp, ethernet communication module, CAN communication module, RS485 communication module, drive trip circuit and audible-visual annunciator, power subsystem is connected for its power supply with single-chip microcomputer and LCD MODULE, single-chip microcomputer by input and treatment circuit be arranged on zero sequence current mutual inductor in electrifying system and be connected and realize earth leakage detection functions, single-chip microcomputer respectively with LCD MODULE, switching input module, keyboard input module, relay output module, watchdog circuit, experimental circuit, status indicator lamp, ethernet communication module, CAN communication module, RS485 communication module, drive trip circuit and audible-visual annunciator to be connected, this driving trip circuit is connected with the tripping operation actuator being arranged in electric power system.When single-chip microcomputer detects certain branch road and has leak current fault to occur, by this branch switch of tripping operation actuating mechanism controls, trip, thus disengagement failure circuit selectively, but still can guarantee the protection facility of non-fault line safe operation; Meanwhile, single-chip microcomputer, by RS485 communication module, ethernet communication module or CAN communication module, is uploaded to state information the monitoring host computer of complex automatic system, realizes remote monitoring function.
As shown in Figure 2, described input and treatment circuit consist of zero sequence voltage phase shifting circuit, residual voltage Circuit tuning, zero cross detection circuit, photoelectric coupling circuit 1, reverser 1, zero-sequence current Circuit tuning, overcurrent sensing circuit, photoelectric coupling circuit 2, reverser 2.Zero sequence voltage phase shifting circuit, residual voltage Circuit tuning, zero cross detection circuit, photoelectric coupling circuit 1, reverser 1 are connected successively, wherein the input of zero sequence voltage phase shifting circuit is connected with zero sequence current mutual inductor, the output of reverser 1 is connected with single-chip microcomputer, zero-sequence current Circuit tuning, overcurrent sensing circuit, photoelectric coupling circuit 2, reverser 2 are connected successively, wherein, the input of zero-sequence current Circuit tuning is connected with zero sequence current mutual inductor, the output of reverser 2 is connected with single-chip microcomputer.When grid power leakage; input and treatment circuit take out zero-sequence current and residual voltage signal from electrical network; after input and treatment circuit by single-chip microcomputer failure judgement branch road; finally by the Single-chip Controlling actuator's (circuit breaker of shunt release or no-voltage release, A.C. contactor, magnetic starter) that trips; with the power supply of disengagement failure branch road, realize selectively creepage protection function.Zero sequence power direction formula selective earth leakage protection mode has very strong horizontal selectivity and longitudinal selectivity, can optionally carry out earth leakage protective.
As shown in Figure 3, this earth leakage protective device is arranged in the electric power system of coal mine underground transformer isolated neutral, zero sequence current mutual inductor TA in earth leakage protective device is connected in supply line, release GF is connected with the driving main switch QF in electric power system, when power consumption equipment normally moves, in circuit, electric current is poised state, in instrument transformer, electric current phasor sum is that zero (electric current is directive vector, if the direction by flowing out is "+", Return-ing direction is "-", size of current round in zero sequence current mutual inductor equates, opposite direction, positive and negative cancelling out each other, that is: I1+I2+I3=0.Owing to there is no residual current in primary winding, so can not respond to secondary coil, the switching device of earth leakage protective device moves in closure state.When device housings occurs leak electricity and have people to touch; in fault point, produce shunting; this leakage current is through human body → the earth → distributed capacitance ground connection along the line; return to transformer neutral point (zero sequence current mutual inductor of not flowing through); cause in zero sequence current mutual inductor the electric current that flows into, flows out to occur uneven (electric current phasor sum is non-vanishing); in primary winding, produce residual current; thereby just can respond to secondary coil; when this current value reaches the operating current value of this earth leakage protective device restriction; automatic switch is threaded off, and cuts off the electricity supply.When there is electric leakage or having people to get an electric shock in protected circuit, due to the existence of leakage current, the phasor by each phase load electric current of TA primary side and no longer equalling zero, that is: I1+I2+I3 ≠ 0 has produced leakage current.In iron core, there is alternating flux; under alternating flux effect; QF second siding ring just has induced electromotive force to produce; this electric leakage signal is processed and compares through intermediate link; when reaching predetermined value, make main switch shunt release coil GF energising, drive main switch QF automatic trip; cut off rapidly protected power supply, thereby realize protection.Operation principle for single-phase loop earth leakage protective device is identical with three-phase loop.
This protector can be realized mining explosion-isolating low-voltage selective earth leakage protection; in mine low-voltage electricity grid certain branch road a certain occur mutually that the person gets an electric shock, when single-phase electric discharge over the ground or single-phase Ground leakage current; system detects in time leak current fault and acts on tripping operation; thereby disengagement failure circuit selectively, but still can guarantee the protection facility of non-fault line safe operation.Selective earth leakage protection principle as shown in Figure 4, in figure, LD1 and LD2 are leakage, K1-K4 is feeding switch, QF1 and QF2 are master switch, QS isolating switch, whether single-chip microcomputer is built-in leaks electricity by zero sequence current mutual inductor and input and every branch road for the treatment of circuit Real-Time Monitoring, and by driving trip circuit and actuator's (release) to realize the selection to main switch and switch-dividing, between main leakage circuit and minute leakage circuit, switch, thereby compatible main switch and switch-dividing function on a cover system, can send leak current fault reports to the police and controls faulty circuit simultaneously.
This protector is by Single-chip Controlling external circuit; to switch between main leakage circuit and minute leakage circuit; thereby compatible main switch and switch-dividing function on a cover system; send leak current fault chimes of doom light signal simultaneously and control; cut off leak current fault circuit, realize the function of selective earth leakage protection.
Single-chip microcomputer is built-in with process software, and as shown in Figure 5, after device power, first this process software can carry out initialization to it to the handling process of this software, to complete the zero clearing of some flag bits and the initialization of single-chip microcomputer; Next on off state is judged, only at switch during in "on" position, system is just carried out detection of electrical leakage, then judgement is main switch or switch-dividing, to call different electric leakage subprograms according to different switches, once system generation leak current fault sends separating brake actuating signal, and control external switch, cut off immediately mains supply.By scm software, programme and realized electric leakage intelligent selection and conversion, signal processing circuit has guaranteed leakage current monitoring accuracy, and update the system electric capacity and the impact of system line voltage on leakage current certainty of measurement at any time, the system of assurance operates in optimum Working.
This mining explosion-isolating low-voltage selective earth leakage protection device not only principle has breakthrough, adopts focus control mode, has solved dispersive leakage problem.And, adopt single-chip microcomputer and software programmable technology, more intelligent and hommization.Be applicable under coal mine, solved well colliery Problem of Mine Leakage Protection.
It is emphasized that; embodiment described in the utility model is illustrative; rather than determinate; therefore the utility model comprises and is not limited to the embodiment described in embodiment; every other execution modes that drawn according to the technical solution of the utility model by those skilled in the art, belong to the scope that the utility model is protected equally.
Claims (6)
1. a Novel mine explosion-proof type selective low-voltage earth leakage protective device, it is characterized in that: comprise single-chip microcomputer, power subsystem, LCD MODULE, input and treatment circuit, switching input module, keyboard input module, relay output module, watchdog circuit, communication module and driving trip circuit, power subsystem is connected for its power supply with single-chip microcomputer and LCD MODULE, single-chip microcomputer by input and treatment circuit be arranged on zero sequence current mutual inductor in electric power system and be connected and realize earth leakage detection functions, single-chip microcomputer respectively with LCD MODULE, switching input module, keyboard input module, relay output module, watchdog circuit is connected, single-chip microcomputer is by driving trip circuit and being arranged on tripping operation actuator in electric power system and being connected and realizing tripping operation control function, single-chip microcomputer is connected and realizes remote monitoring function with remote monitoring main frame by communication module.
2. Novel mine explosion-proof type selective low-voltage earth leakage protective device according to claim 1, is characterized in that: described input and treatment circuit comprise zero sequence voltage phase shifting circuit, residual voltage Circuit tuning, zero cross detection circuit, the first photoelectric coupling circuit, the first reverser, zero-sequence current Circuit tuning, overcurrent sensing circuit, the second photoelectric coupling circuit, the second reverser; Zero sequence voltage phase shifting circuit, residual voltage Circuit tuning, zero cross detection circuit, the first photoelectric coupling circuit, the first reverser are connected successively, wherein, the input of zero sequence voltage phase shifting circuit is connected with zero sequence current mutual inductor, and the output of the first reverser is connected with single-chip microcomputer; Zero-sequence current Circuit tuning, overcurrent sensing circuit, the second photoelectric coupling circuit, the second reverser are connected successively, wherein, the input of zero-sequence current Circuit tuning is connected with zero sequence current mutual inductor, the output of the second reverser is connected with single-chip microcomputer.
3. Novel mine explosion-proof type selective low-voltage earth leakage protective device according to claim 1, is characterized in that: described communication module is a kind of in ethernet communication module, CAN communication module, RS485 communication module or their combination.
4. Novel mine explosion-proof type selective low-voltage earth leakage protective device according to claim 1, is characterized in that: described tripping operation actuator is circuit breaker, A.C. contactor or the magnetic starter of shunt release, no-voltage release.
5. according to the Novel mine explosion-proof type selective low-voltage earth leakage protective device described in claim 1 to 4 any one, it is characterized in that: described single-chip microcomputer also connects an audible-visual annunciator.
6. according to the Novel mine explosion-proof type selective low-voltage earth leakage protective device described in claim 1 to 4 any one, it is characterized in that: described single-chip microcomputer also connects a status indicator lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320554774.XU CN203445594U (en) | 2013-09-06 | 2013-09-06 | Novel explosion-proof type low-voltage selective electric leakage protector used for mining |
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| CN201320554774.XU CN203445594U (en) | 2013-09-06 | 2013-09-06 | Novel explosion-proof type low-voltage selective electric leakage protector used for mining |
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| CN203445594U true CN203445594U (en) | 2014-02-19 |
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| CN201320554774.XU Withdrawn - After Issue CN203445594U (en) | 2013-09-06 | 2013-09-06 | Novel explosion-proof type low-voltage selective electric leakage protector used for mining |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427394A (en) * | 2013-09-06 | 2013-12-04 | 天津华宁电子有限公司 | Mining flame-proof type selective leakage protector |
| 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 |
| CN109510166A (en) * | 2018-12-29 | 2019-03-22 | 徐州中矿大传动与自动化有限公司 | A kind of power system in mines electric shock detection and prevention and control device and method |
-
2013
- 2013-09-06 CN CN201320554774.XU patent/CN203445594U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427394A (en) * | 2013-09-06 | 2013-12-04 | 天津华宁电子有限公司 | Mining flame-proof type selective leakage protector |
| 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 |
| CN109510166A (en) * | 2018-12-29 | 2019-03-22 | 徐州中矿大传动与自动化有限公司 | A kind of power system in mines electric shock detection and prevention and control device and method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140219 Effective date of abandoning: 20150812 |
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| RGAV | Abandon patent right to avoid regrant |