CN201234120Y - Novel comprehensive protector for mining coal drill - Google Patents
Novel comprehensive protector for mining coal drill Download PDFInfo
- Publication number
- CN201234120Y CN201234120Y CNU2008201482622U CN200820148262U CN201234120Y CN 201234120 Y CN201234120 Y CN 201234120Y CN U2008201482622 U CNU2008201482622 U CN U2008201482622U CN 200820148262 U CN200820148262 U CN 200820148262U CN 201234120 Y CN201234120 Y CN 201234120Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- processing unit
- central processing
- coal drill
- electric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a comprehensive electric equipment protection device, which comprises a microcomputer controller. The microcomputer comprises a carrier frequency detection circuit, an electric leakage detection circuit, an A/D conversion circuit, a pilot circuit, a first central processing unit and a second central processing unit, wherein the output terminals of the carrier frequency detection circuit and the electric leakage detection circuit are connected with the first central processing unit; and a current change rate detection management program is loaded in the second central processing unit for determining that the short circuit fault of the circuit occurs when the current change rate of the circuit exceeds a set valve, and transmitting a control signal to an executive mechanism within a set time. The comprehensive electric coal drill protection has the advantages of reasonable design, accurate short-circuit fault determination, and timely and reliable action. A three-phase transformer is integrally formed with the microcomputer controller to reduce the external connection circuit. A DC solid-state relay is used as a neutral point switch, which has quick short circuit protection action.
Description
One, technical field: the utility model relates to a kind of electric equipment comprehensive protector, can judge short trouble and implement protection by Monitoring Line or power consumption equipment current changing rate.
Two, background technology: the every profession and trade electric equipment is carried out short-circuit protection, is one of important safeguard measure of normal operation of assurance equipment and production safety.For guaranteeing that safeguard measure does not produce misoperation, crucial is to ensure that failure judgement detects fault-signal accurately, timely.Present short-circuit detecting technology both domestic and external, several modes below main employing the: 1, based on the current protection technology that detects the short circuit current size, this overcurrent protection is adjusted according to the principle of the maximum starting current that escapes motor, when supply line head, during the line end short circuit, short circuit current is very little, and the sensitivity of protection is difficult to reach requirement; 2, based on the short-circuit protection technology of phase sensitivity principle, existing research both at home and abroad is more, also comparative maturity, though solved the problem of protection sensitivity, this kind technology can only be protected three-phase shortcircuit, and line to line fault is failure to actuate; 3, based on the short-circuit protection technology of carrier frequency principle, domestic in the electric coal drill comprehensive protection device of colliery, use more.But this kind protection is strict to line parameter circuit value (cross-section of cable, length and power transformer etc.), the line parameter circuit value misoperation that goes beyond the scope, poor reliability.As seen, detecting and resist technology if can develop a kind of accurate, reliable short trouble, to safeguarding normal industrial and agricultural production, ensure the society and the people's the security of the lives and property, is how important.
Chinese invention patent ZL 95108848.3 (notification number CN 1053277C, June 7 2000 Granted publication day) a kind of detection method and fault detector of short-circuit fault current path are disclosed, this invention is by detecting electric current Bianization Shuai ⊿ I/t〉K, electric current drops to zero Shi Jian ⊿ T and satisfies t
1≤ ⊿ T≤t
2Differentiate fault.Wherein disclosed fault detector by change-over circuit, big current-jump testing circuit, power-fail detection circuit and pulse duration and fault distinguishing circuit, provides the signal that drives indication body.This invention detection method is differentiated fault and is not accurately had misoperation, and fault detector is easy to use, has a extensive future.But its standard of judging the short circuit current fault is not really to be based upon on the current changing rate Mathematical Modeling basis of short circuit current under the malfunction; purpose is to judge the fault paths of circuit after protective relaying device control disconnects; its prerequisite is that the circuit relay protection device is judged device action behind the short trouble open-circuit line, because of rather than truly the current changing rate detection short trouble that utilizes carry out the method for short-circuit protection.
Three, utility model content:
The utility model is at the prior art deficiency; a kind of novel electric coal drill comprehensive protector is proposed; can be by circuit or power consumption equipment current changing rate be monitored; and different according to short-circuit current wave form varies and other fault current wave form varies rules; accurately judge the short trouble of circuit or power consumption equipment, and further take safeguard measure.
The technical scheme that the utility model adopted:
A kind of novel electric coal drill comprehensive protector; contain microcomputer controller; the three-phase current detection instrument transformer; actuator; filter circuit and power circuit; power circuit provides the microcomputer controller working power; described actuator comprises an ac solid relay and a neutral point switch circuit; the ac solid relay input connects main circuit power supply power transformer ZB secondary side output; the ac solid relay output connects the electric coal drill motor by the electric coal drill hand switch; described neutral point switch circuit contains rectified three-phase circuit; dc solid-state relay and counter voltage thereof absorb circuit; the neutral point switch circuit is connected the neutral point of main circuit power supply power transformer ZB secondary side; described microcomputer controller contains the carrier frequency testing circuit; electric-leakage detection circuit; the A/D change-over circuit; the precursor circuit and first central processing unit and second central processing unit; the three-phase current detection instrument transformer converts the current signal that detects to voltage signal and inserts A/D converter; and convert the corresponding I/O input port that digital signal inserts first central processing unit and second central processing unit respectively to through A/D converter, dc solid-state relay and ac solid relay in the corresponding I/O control port control connection actuator of first central processing unit.
Described novel electric coal drill comprehensive protector; the built-in operation main program of first central processing unit, parameter are provided with subprogram etc.; the input of carrier frequency, electric-leakage detection circuit connects the three-phase output end of ac solid relay; the output of carrier frequency testing circuit, electric-leakage detection circuit inserts the corresponding I/O input port of first central processing unit; when protection circuit leaks electricity, when the phase failure, overload, short circuit; first central processing unit sends control signal and gives ac solid relay, cuts off the main circuit power supply power supply.
Described novel electric coal drill comprehensive protector; mutual communication is connected first central processing unit with second central processing unit; the second central processing unit built-in current rate of change detects hypervisor; when the line current rate of change surpasses set point continuously; then be judged as circuit and short trouble occurs; and in setting-up time, send control signal and give actuator, disconnect main circuit power supply power transformer ZB secondary side neutral point and ac solid relay, cut off the main circuit power supply power supply.
Described novel electric coal drill comprehensive protector; detection of electrical leakage adopts the mode of additional stability direct current; reference potential low-voltage tracking technique is adopted in the leakage tripping protection; detection signal inserts a comparator through 127V three-plase half wave rectifier circuit and coupling resistance; the comparator reference current potential adopts no voltage stabilizing 12V power supply; comparator output terminal inserts the corresponding I/O input port of first central processing unit by light-coupled isolation, and the detection of electrical leakage reference potential is with voltage ripple of power network, changes synchronously with current potential relatively.
Described novel electric coal drill comprehensive protector; microcomputer controller contains leading control circuit; the corresponding control I/O output port of first central processing unit connects leading control circuit; the leading control circuit output connects the control end of ac solid relay; make leading control circuit work by+12V power supply after the electric coal drill bat-handle switch closure; first central processing unit sends and keeps signal and keep automatically by optocoupler U6 after the electric coal drill work; first central processing unit turn-offed U6 when the electric coal drill bat-handle switch disconnected, and cable is not charged when not working with the assurance electric coal drill.
Useful good effect of the present utility model:
1, the utility model electric coal drill comprehensive protector, reasonable in design, short trouble accuracy of judgement, action is in time, reliably.Utilize the short-circuit detecting technology of current changing rate, design Single-chip Controlling program can accurately be judged circuit or power consumption equipment short trouble, and the measure that in time provides safeguard, the negative effect of effectively avoiding circuit or power consumption equipment short trouble to bring reduces economic loss.
2, the utility model electric coal drill comprehensive protector; adopt totally digitilized Anti-interference Design; fast break technology, current changing rate short-circuit detecting resist technology, carrier frequency short-circuit detecting resist technology, singlechip technology have comprehensively been adopted; used the disjunction element (old product employing A.C. contactor) of novel solid-state relay, do not produced any spark as major loop.Solved existing product short-circuit protection length operate time, guard space weak point, short-circuit protection misoperation when drilling, poor anti jamming capability, accuracy low, adjust problem such as difficulty.
3, the utility model electric coal drill comprehensive protector has anti-electric network pollution, electromagnetic interference and reverse transient overvoltage function; have good insulation preformance, life-span length, menu operation, human-computer dialogue, memory demonstration, function expansion, low in energy consumption, maintenance capacity is little, do not have cremate, be swift in motion, reliable operation, steady performance; (old product adopts controllable silicon as neutral point switch to adopt dc solid-state relay; the control difficulty), short-circuit protection is swift in motion.
4, the utility model electric coal drill comprehensive protector adopts microcomputerized control, and circuit is simple, and complete machine adopts card format, the reliability height, and control guard space folk prescription is to reaching 0～300 meter.Maintenance capacity is little, and it is convenient to change.Three-phase instrument transformer and microcomputer controller integrated design have reduced the external connection line road.Earth leakage search/lockout and tripping operation adopt additional dc power supply to follow the detection of electrical leakage technology of voltage ripple of power network, and reference potential changes synchronously with current potential relatively, is not subjected to the influence of voltage fluctuation.The protection of short circuit blocking employing carrier frequency, the short circuit tripping operation is adopted and detected the current changing rate principle, and is highly sensitive, and has nothing to do with the position of fault, transformer capacity, conductor cross-section.
Four, description of drawings:
Fig. 1: novel electric coal drill comprehensive protector electrical schematic diagram
Fig. 2: novel electric coal drill comprehensive protector electric leakage, insulation detect and the control circuit schematic diagram
Fig. 3: novel electric coal drill comprehensive protector short-circuit detecting and control processing circuit schematic diagram
Fig. 4: ac solid relay input and output waveform
Fig. 5: short circuit and dc solid-state relay control signal waveform ()
Fig. 6: short circuit and dc solid-state relay control signal waveform (two)
Fig. 7: short circuit and dc solid-state relay control signal waveform (three)
Fig. 8: short circuit and dc solid-state relay output waveform
Five, embodiment:
Embodiment one: referring to Fig. 1; novel electric coal drill comprehensive protector of the present utility model; main circuit power supply is by isolating switch 1K, primary side fuse 1RD, 2RD, main transformer ZB; three-phase commutation bridge Z; dc solid-state relay 2SSR, secondary side fuse 3RD, 4RD, ac solid relay 1SSR forms; three-phase current detection transformer current signal output part connects microcomputer controller, and power circuit provides the working power of microcomputer controller.Dc solid-state relay 2SSR in the actuator is connected in the rectified three-phase circuit output that main circuit power supply power transformer ZB secondary side neutral point connects in parallel, the input of ac solid relay 1SSR connects main circuit power supply power transformer ZB secondary side output, the output of ac solid relay connects the electric coal drill motor by the electric coal drill hand switch, and the control input end of dc solid-state relay 2SSR, ac solid relay 1SSR connects the control output end of microcomputer controller.
Referring to Fig. 3, microcomputer controller contains second central processor CPU 2, three-phase air core current transformer LH converts detected current signal to voltage signal, and convert digital signal to through A/D converter, through inserting the corresponding I/O input port of second central processor CPU 2 after the preliminary treatment, the corresponding I/O control port control connection dc solid-state relay 2SSR of second central processor CPU 2, second central processor CPU, 2 built-in current rates of change detect hypervisor, when the line current rate of change surpasses set point continuously, then be judged as circuit and short trouble occurs, and in setting-up time, send control signal and give dc solid-state relay 2SSR, disconnect main circuit power supply power transformer ZB secondary side neutral point, cut off the main circuit power supply power supply.CPU2 adopts the LPC2131 of PHILIPS Co., central processing unit has connected a jtag interface agreement integrated circuit (IC) chip and has been used for close beta or realizes online programming, the model selection of JTAG, clock, data are imported the corresponding port that is connected LPC2131 with DOL Data Output Line respectively, CAT1025 among Fig. 3 is a reset control chip, its reseting port, FPDP connects reseting port and the corresponding I/O FPDP of LPC2131 respectively, among the figure U7 be integrated circuit (IC) L7660 provide comparator in the A/D change-over circuit need-5V and+the 5V power supply, U6 (integrated circuit SPX1117) provides that central processor CPU 2 needs+the 3V working power.
Embodiment two: referring to Fig. 1, Fig. 2, Fig. 3.Present embodiment is with embodiment one difference, microcomputer controller contains carrier frequency, electric-leakage detection circuit, first central processor CPU 1 and the leading control circuit, the current transformer three-phase current signal is through filtering, insert two A/D converters after the rectification preliminary treatment respectively, two A/D converter outputs insert the corresponding I/O input port of first central processor CPU 1 respectively, carrier frequency, the input of electric-leakage detection circuit connects the three-phase output end of ac solid relay 1SSR, carrier frequency, the output of electric-leakage detection circuit inserts the corresponding I/O input port of first central processor CPU 1, the corresponding control I/O output port of first central processor CPU 1 connects leading control circuit, leading control circuit output control connection ac solid relay 1SSR.First central processor CPU 1 adopts AT89C52, and AT89C52 is connected with supervisory memory X25045 (watchdog circuit).
Novel electric coal drill comprehensive protector of the present utility model has guide's controlled function, and cable was not charged when the assurance electric coal drill was worked; Have leakage tripping, earth leakage search/lockout protection, over-load inverse time-lag protection, open phase protection, short circuit tripping operation, short circuit blocking defencive function.Anti-electric network pollution, electromagnetic interference capability are strong, can onlinely carry out power setting and fault inquiry etc., are provided with working station indicator, can inquire about nearly 5 times malfunction.
The short-circuit protection operation principle is as follows: when electric coal drill was worked, three-phase current signal converted digital signal to through A/D converter, through preliminary treatment, gave respectively that CPU1 and CPU2 analyze, computing.By design singlechip CPU 2 programs, the current changing rate in the section is sometime carried out continuous detecting, if detected repeatedly current changing rate all surpasses the current changing rate Is under the normal condition, think that then short trouble has taken place power consumption equipment.When short trouble occurring, CPU2 analyzes, send power failure commands for controlling signal after the computing, comparison in 2ms, cuts off dc solid-state relay 2SSR, makes main transformer secondary side neutral point disconnect, and disconnects main circuit power; CPU1 receives an external interrupt signal simultaneously, sends blocking order, cuts off ac solid relay 1SSR, realizes short circuit blocking.
The electric coal drill start and stop are finished by precursor circuit control.When spudding in, at first closed electric coal drill bat-handle switch K2, connect following guide loop: 12V+ → J1 normally-closed contact 1-2 → R04 → WY13 → R05 → WY14 → D47 → C phase → 2K → motor → 2K → B phase → J1 normally-closed contact 4-5 → D48 → R06 → R40//C41 → 12V-.Signal voltage is obtained from R40, deliver to 3 pin of U41A by R41, the 1 pin output high level of U41, Q41 conducting, J1, J2 adhesive, J1 normally opened contact 1-3 closure, connect interchange three-phase solid-state relay control signal through optocoupler, the three-phase solid-state relay is connected, electric coal drill work, the CPU output low level, light idol U6 conducting.Meanwhile, J1, J2 disconnect, and cut off the guide loop, and keeping signal is provided by light idol U6, keeps electric drill work.When stopping boring, bat-handle switch 2K disconnects, and main circuit current interrupts, and CPU exports high level, light idol U6 turn-offs, the 1 pin output low level of U41, and J1, J2 discharge, and Q44 disconnects three-phase solid-state relay control signal, the three-phase solid-state relay disconnects, and cuts off the 127V power supply, and cable is not charged when guaranteeing not drill.
Short circuit blocking protection: when electric coal drill is not worked; adopt carrier frequency to detect the short-circuit protection technology; realize the short circuit blocking function; operation principle: when electric coal drill is not worked; on Monitoring Line, add the CF signal of a fixed frequency all the time; short circuit appears in cable; the alternate impedance of electrical network reduces; oscillator is because of the overweight failure of oscillation of load; give CPU1 by testing circuit with signal; CPU1 sends the fill order of cutting off the electricity supply; detailed process is as follows: by Q31; D31; D33; R32; R33; R38; P31; C33; C34; L31 forms the inductance of three-point self-excited oscillator; after the L32 coupling; produce the 15kHz CF signal, through two-way output, a path L32; R30; R31; C30; C31; element and the couplings of 127V three phase network such as C32; another path L31; D32; R39; R34; C35 gives U21B comparator 6 pin, as detection signal voltage.Line insulation resistance is very high under the normal condition, and oscillator loading is very light, and signal voltage is higher than comparative voltage, the U21B output low level.When the 127V electrical network is short-circuited, resistance R 30, R31 become the basic load of oscillator, oscillator increases the weight of failure of oscillation because of load, the output of no signal voltage, U21B output becomes high level by low level, this level through optocoupler give CPU1, CPU1 receive this signal send hold the order and locking, closed electric coal drill bat-handle switch then can not send.
Appear at the electric coal drill winding as short trouble, then when bat-handle switch K2 was closed, just can detect electric coal drill winding short trouble, CPU1 did not just send have a power failure instruction and locking to CF signal before electric drill is worked.
Earth leakage protective.When electric coal drill was not worked, earth leakage search/lockout adopted the mode of additional direct current to detect and protects, and advantage is the influence that is not subjected to voltage ripple of power network.The detection loop is: 12V+ → J1 normally-closed contact 1-2 → R04 → WY13 → R05 → WY14 → D47 → C phase → ground leakage resistance → X10 → J2 normally-closed contact 4-5 → P22 → R28 → R20//C21 → 12V-.When three phase network insulation against ground level is higher, flow path testing circuit electric current is very little, deficiency is so that the upset of comparator U21A output level, arbitrary phase when three phase network, or the arbitrary insulation resistance relatively of electric coal drill winding reduces and when being lower than set point, in close handles K switch 2, additional direct current+12V footpath K2 is added on electric coal drill winding and the threephase cable, leakage current makes the level at R20 be higher than comparative level, voltage on the R20 is delivered to 3 pin of U21A through R21, and U21A output is high level by the low level upset, and this level signal is given CPU1 through optocoupler, CPU1 sends blocking order, circuit interlocking before sending electricity.
Leakage tripping adopts detection of electrical leakage reference potential low-voltage tracking technique.During electric coal drill work, J1, J2 adhesive, the leakage tripping detection signal obtains from the three phase network rectification, reference potential is obtained from no voltage stabilizing 12V, with voltage ripple of power network, reference potential loop: A12V+ → D204 → R24 → D23 → D24 → R22 → A12V-, the 2 pin current potentials of U21A are with voltage ripple of power network.Detect loop: three phase network → R201-203 → D201-203 → R27 → R26//C22 → R29 → P21 → D21 → J2 normally opened contact 4-6 → X10 → ground leakage resistance → three phase network.As three phase network insulation against ground level when higher, the electric current that flow path detects the loop is very little, deficiency is so that the upset of comparator U21A output level, when the arbitrary insulation resistance relatively of three phase network, electric coal drill winding reduces and is lower than set point, the level that leakage current makes on R26 and produced is higher than comparative level, this voltage is delivered to 3 pin of U21A through D22 → R20//C21 → R21, U21A output is high level by the low level upset, this level signal is given CPU1 through optocoupler, and CPU1 receives this signal and sends have a power failure instruction and locking.
Overload, the open phase protection operation principle is as follows: electric drill start or running in; convert detected current signal to digital signal through A/D converter by threephase current transformer and give CPU1; CPU1 analyzes, calculates the signal of gathering; and compare with set point; if the electric coal drill fault-free exists, electric drill normally moves.If overload or open phase fault appear in electric drill in the running, CPU1 sends instruction, cuts off the electricity supply, and electric coal drill is out of service.
Electrical network filtering and counter voltage absorb circuit.The electric network pollution filter circuit is made up of RX1-6, CX1-3.But the various disturbing waves of this circuit filtering three phase network guarantee the influence of the interference-free pulse of single-chip microcomputer, make single-chip microcomputer stable detection fault-signal.The counter voltage that fast break produces absorbs circuit and is made up of RX7, CX4, RP.Because the opening speed of dc solid-state relay is fast (about 1ms) very, make inductive load loop moment produce very high counter voltage (kilovolt level), the circuit of being made up of RX7, CX4, RP can absorb this counter voltage, and it is limited in the 470V, guarantee that dc solid-state relay 2SSR is not breakdown.
Hookup.Leak(age) test: push SK2, electrical network one is connected through 1K Ω resistance and auxiliary earth, and device should be realized earth leakage search/lockout or leakage tripping, and indicator light LED5 (yellow) is bright simultaneously, and leak current fault has taken place the expression electrical network.Short circuit test is pushed SK1, and electrical network A, C connect through 2 μ F electric capacity, and device should be realized short circuit blocking or short circuit tripping operation, and indicator light LED6 (yellow) is bright, the expression electrical network fault that has been short-circuited.
Fig. 4 to Fig. 8 is the utility model test result oscillogram.By the test result oscillogram of Fig. 4 to Fig. 8 as can be seen, short-circuit protection operate time is the longest to be 37ms, and the shortest is 13ms; Earth leakage protective operate time is the longest to be 180ms, and the shortest is 80ms; Dc solid-state relay self action turn-off time＜270 μ s; Ac solid relay self action turn-off time≤10ms.Every test index all reaches leading domestic level, short circuit and earth leakage protective reliable in action, in time, be Safety of Coal Mine Production not or the comprehensive protector that lacks.
Claims (4)
1; a kind of novel electric coal drill comprehensive protector; contain microcomputer controller; the three-phase current detection instrument transformer; actuator; filter circuit and power circuit; power circuit provides the microcomputer controller working power; described actuator comprises an ac solid relay and a neutral point switch circuit; the ac solid relay input connects main circuit power supply power transformer ZB secondary side output; the ac solid relay output connects the electric coal drill motor by the electric coal drill hand switch; described neutral point switch circuit contains rectified three-phase circuit; dc solid-state relay and counter voltage thereof absorb circuit; the neutral point switch circuit is connected the neutral point of main circuit power supply power transformer ZB secondary side; it is characterized in that: described microcomputer controller contains the carrier frequency testing circuit; electric-leakage detection circuit; the A/D change-over circuit; the precursor circuit and first central processing unit and second central processing unit; the three-phase current detection instrument transformer converts the current signal that detects to voltage signal and inserts A/D converter; and convert the corresponding I/O input port that digital signal inserts first central processing unit and second central processing unit respectively to through A/D converter; dc solid-state relay and ac solid relay in the corresponding I/O control port control connection actuator of first central processing unit; the carrier frequency testing circuit; the input of electric-leakage detection circuit connects the three-phase output end of ac solid relay, carrier frequency testing circuit; the output of electric-leakage detection circuit inserts the corresponding I/O input port of first central processing unit.
2, novel electric coal drill comprehensive protector according to claim 1; it is characterized in that: mutual communication is connected first central processing unit with second central processing unit; the second central processing unit built-in current rate of change detects hypervisor; when the line current rate of change surpasses set point continuously; then be judged as circuit and short trouble occurs, and in setting-up time, send control signal and give actuator.
3, novel electric coal drill comprehensive protector according to claim 1 and 2; it is characterized in that: detection of electrical leakage adopts the additional stability d. c. voltage signal; the leakage tripping protection adopts the reference potential low-voltage to follow the tracks of; detection signal inserts a comparator through 127V three-plase half wave rectifier circuit and coupling resistance; the comparator reference current potential adopts no voltage stabilizing 12V power supply; comparator output terminal inserts the corresponding I/O input port of first central processing unit by light-coupled isolation; the detection of electrical leakage reference potential changes with the comparison current potential synchronously with voltage ripple of power network.
4, novel electric coal drill comprehensive protector according to claim 3; it is characterized in that: the corresponding control I/O output port of first central processing unit connects leading control circuit; the leading control circuit output connects the control end of ac solid relay; make leading control circuit work by+12V power supply after the electric coal drill bat-handle switch closure; first central processing unit sends and keeps signal and keep automatically by optocoupler U6 after the electric coal drill work, and first central processing unit turn-offed U6 when the electric coal drill bat-handle switch disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201482622U CN201234120Y (en) | 2008-07-29 | 2008-07-29 | Novel comprehensive protector for mining coal drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201482622U CN201234120Y (en) | 2008-07-29 | 2008-07-29 | Novel comprehensive protector for mining coal drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201234120Y true CN201234120Y (en) | 2009-05-06 |
Family
ID=40620509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201482622U Expired - Fee Related CN201234120Y (en) | 2008-07-29 | 2008-07-29 | Novel comprehensive protector for mining coal drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201234120Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435884A (en) * | 2011-09-28 | 2012-05-02 | 山东一统电器有限公司 | Intelligent test bed for testing protection performance of explosion-proof electrical appliance and operation method thereof |
| CN103731071A (en) * | 2012-10-13 | 2014-04-16 | 成都进界科技有限公司 | Mine electric coal drill controller |
| CN105322510A (en) * | 2014-06-20 | 2016-02-10 | 中国矿业大学(北京) | Quick power cut device based on solid state circuit breaker |
| CN108963992A (en) * | 2018-07-18 | 2018-12-07 | 上海联影医疗科技有限公司 | The power distribution control system of Medical Devices |
| CN114285333A (en) * | 2021-12-23 | 2022-04-05 | 浙江欣兴工具股份有限公司 | Control circuit of automatic feeding magnetic seat drilling machine |
-
2008
- 2008-07-29 CN CNU2008201482622U patent/CN201234120Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435884A (en) * | 2011-09-28 | 2012-05-02 | 山东一统电器有限公司 | Intelligent test bed for testing protection performance of explosion-proof electrical appliance and operation method thereof |
| CN103731071A (en) * | 2012-10-13 | 2014-04-16 | 成都进界科技有限公司 | Mine electric coal drill controller |
| CN105322510A (en) * | 2014-06-20 | 2016-02-10 | 中国矿业大学(北京) | Quick power cut device based on solid state circuit breaker |
| CN105322510B (en) * | 2014-06-20 | 2018-02-13 | 中国矿业大学(北京) | A kind of rapid power-down device based on solid circuit breaker |
| CN108963992A (en) * | 2018-07-18 | 2018-12-07 | 上海联影医疗科技有限公司 | The power distribution control system of Medical Devices |
| CN108963992B (en) * | 2018-07-18 | 2020-05-19 | 上海联影医疗科技有限公司 | Power distribution control system of medical equipment |
| CN114285333A (en) * | 2021-12-23 | 2022-04-05 | 浙江欣兴工具股份有限公司 | Control circuit of automatic feeding magnetic seat drilling machine |
| CN114285333B (en) * | 2021-12-23 | 2024-04-02 | 浙江欣兴工具股份有限公司 | Automatic feeding magnetic base drilling machine control circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101752873B (en) | Protection method of DC electricity transmission high-voltage convertor station | |
| CN101494374B (en) | Current protection control method for vacuum circuit breaker | |
| CN201234120Y (en) | Novel comprehensive protector for mining coal drill | |
| CN103091595B (en) | The method of discrimination that a kind of generator terminal voltage mutual inductor once breaks | |
| CN103701135A (en) | Intelligent series compensation device for distribution network and use method of compensation device | |
| CN108776283A (en) | A kind of CT not exclusively lower power distribution network single-phase disconnection fault judgment method of configuration with judge system | |
| CN202121298U (en) | Microcomputer protective system of converter transformer | |
| CN104779705A (en) | Line protection measurement and control method and device | |
| CN104539039A (en) | Rapid switching device for 110kV power system of petrochemical enterprises | |
| CN115825638A (en) | Power distribution network single-phase earth fault comprehensive judgment system and method | |
| CN203536971U (en) | Series connection compensation device for intelligent distribution network | |
| CN202888785U (en) | Device for controlling single-phase automatic reclosing operation of ultrahigh-voltage transmission line | |
| CN102655321A (en) | Motor fault protection device of motor | |
| CN109617019A (en) | A kind of flame-proof mine double loop fan protection device | |
| CN206099310U (en) | Intelligent controller | |
| CN102868137A (en) | Method and device for controlling ultrahigh-voltage transmission line single-phase automatic reclosing | |
| CN105119256B (en) | Prevent power network distance protection first start after decompression malfunction method | |
| CN202486236U (en) | Detection circuit for monitoring state of current transformer | |
| CN210835064U (en) | Metering type intelligent circuit breaker based on Internet of things | |
| CN204696029U (en) | Monostable permanent magnetic mechanism controller and there is its vacuum circuit-breaker | |
| CN109660018A (en) | A kind of transmission line of electricity sensing electricity getting device based on Rogowski coil | |
| CN102393496B (en) | Novel method for detecting abnormality of alternating current circuit of traction substation | |
| CN202190057U (en) | Generator grounding protective device | |
| CN202134943U (en) | Low-voltage protection measurement and control unit used for electric automobile AC charging post | |
| CN201616665U (en) | Relay protection device of microcomputer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090506 Termination date: 20110729 |